CN101008357A - Engine driven type work machine - Google Patents
Engine driven type work machine Download PDFInfo
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- CN101008357A CN101008357A CN 200710008239 CN200710008239A CN101008357A CN 101008357 A CN101008357 A CN 101008357A CN 200710008239 CN200710008239 CN 200710008239 CN 200710008239 A CN200710008239 A CN 200710008239A CN 101008357 A CN101008357 A CN 101008357A
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Abstract
An engine-driven work machine (10) having a target engine speed selection unit (65) and a control unit (89). The target engine speed selection unit (65) selects and specifies an arbitrary target engine speed from among a plurality of target engine speeds that is set in stepwise fashion. The control unit (89) electrically controls the opening and closing of a throttle valve (92) so that the actual engine speed (14) conforms to the specified target engine speed.
Description
Technical field
The present invention relates to a kind of by engine driving and be provided with the engine driven type work machine of various types of utensils.
Background technique
The working machine that is provided with the utensil of engine driving for example comprises such working machine, and the load that wherein imposes on utensil increases according to working condition, for example in the back-walking type mowing machine.The back-walking type mowing machine is to mow at the self-propelled cutter that utilizes simultaneously, and by the working machine of walking operator control.In Japanese patent laid-open No.9-301015 (JP 09-301015 A) number communique, this class back-walking type mowing machine has been described.
Disclosed back-walking type mowing machine makes the output of the engine of driving wheel and the rotation of the cutter that is used to mow by utilization among the JP 09-301015 A, mows simultaneously self-propelled.The operator operates the operation clutch shaft and should move clutch shaft and switch between separated state and jointing state, thereby driving wheel is switched between halted state and running state.At this moment, the angle of closure reduces along with the switch motion of operation clutch shaft temporarily in the engine.As a result, because engine speed reduces temporarily, so being traveling under the lower-speed state smooth starting and steadily stopping of back-walking type mowing machine.
Recently in Japanese patent laid-open No.4-350333 (JP 04-350333 A) number communique and Te Kai No.2005-98223 (JP 2005-098223 A) number communique, disclose the example of the engine driven type work machine of mowing machine, lawnmower and various other types, wherein controlled closure automatically by the electronic controller that is located on the engine.
In JP 04-350333 A in disclosed mowing machine, lawnmower or other engine driven type work machine, electronic controller is controlled the angle of closure automatically according to move the magnitude of load of solar term bar when carrying out operation the operator.Engine driven type work machine also is constructed such that the operator his hand from solar term bar when operation close the throttle completely or partially automatically of removing and stop operation.As a result, engine speed is got back to idling speed or certain minimum speed.
Disclosed back-walking type mowing machine is provided with electronic controller among the JP 2005-098223 A, and makes the output of the engine of driving wheel and the rotation of the cutter that is used to mow by utilization, mows simultaneously self-propelled.Electronic controller is by the opening and closing of electric control closure, as following (1) Control Engine rotating speed to described in (3).
(1) also do not mow when operation when operator's operation of neither advancing, electronic controller is controlled, thereby the engine speed (actual RPM) of reality is adjusted into idling speed.
(2) when the operator only advances operation, electronic controller is controlled to increase actual engine speed gradually.Therefore, prevented the unexpected motion of back-walking type mowing machine.
(3) mow when operation as the operator, electronic controller is controlled, and makes actual engine speed keep higher after the used target engine speed during increasing to mowing incessantly, and has nothing to do with the operation of whether advancing.
The operation period of disclosed engine driven type work machine in JP 9-301015 A, JP 4-350333 A and JP 2005-098223 A, actual working condition is not necessarily constant.According to working condition, the load that is applied on the utensil can notable change between operational period.But thereby be applied to also notable change of load on the engine.
Because electronic controller carries out electric control to the opening and closing of closure, make actual engine speed meet the target engine speed, so when the load on the engine increased, the angle of closure increased according to the increase of load.
Yet when the load on the engine was maximum, even the angle of closure increases, actual engine speed also began to descend with respect to the target engine speed.Because so the rotary weakening of mowing machine when the engine speed of reality descends is the decrease in efficiency of cutting operation.
The operator can also mobile solar term bar, suitably to adjust engine speed according to engine load.In load hour, even when machine is worked under the state that engine speed reduces, it also is enough that engine is exported.When load was big, machine can be worked under the state that engine speed increases, to increase engine output.
Yet between operational period, for the operator, engine speed is adjusted to appropriate value is pretty troublesome thereby the load on each engine moves the solar term bar when changing.When engine speed excessively reduced, the output of engine was too low and can not handle load.Therefore need the certain experience level suitably to carry out the fine setting of engine speed.
Engine can remain under the state of high speed rotating, makes engine output can keep higher, thereby avoids this adjustment operation that needs the trouble of experience.Yet, when adopting this structure, even also keep higher than hour engine speed in load.As a result, the noise that is produced by engine during high speed rotating continues, and this is disadvantageous to improving working environment.This structure also is disadvantageous for the fuel consumption that reduces engine.
Therefore need a kind of like this technology, can adjust processing ease and working efficiency that engine speed improves engine driven type work machine easily by making the operator whereby.Also need a kind of technology, can further reduce the noise that produces by engine driven type work machine whereby, thereby further improve working environment.
Summary of the invention
According to an aspect of the present invention, a kind of engine driven type work machine is provided, this engine driven type work machine is used for coming driving implement by engine, this engine driven type work machine comprises: target engine speed selected cell, this target engine speed selected cell select and specify target engine speed arbitrarily from a plurality of target engine speeds of setting with hierarchical approaches; And control unit, this control unit is used for electric control is carried out in the opening and closing of the closure of described engine, thereby makes the actual engine rotating speed of described engine meet the target engine speed by the appointment of described target engine speed selected cell.
Therefore the operator can select the single engine speed of target arbitrarily from a plurality of target engine speeds of setting with hierarchical approaches, and specifies selected single target engine speed from described target engine speed selected cell to described control unit by operating described target engine speed selected cell.Described control unit carries out electric control to the opening and closing of described closure, makes described actual engine rotating speed (actual RPM) meet the target engine speed of described appointment.For example, described control unit is controlled the angle of described closure automatically by the control motor.Therefore, the operator can be only by the described target engine speed selected cell of operation special speed change easily to the described target engine speed of described selective value.Therefore the operator needn't operate the described target engine speed of solar term pole pair and finely tunes.
For example, even when making the load notable change that is applied on the described engine owing to the load notable change on the described utensil, the operator also can easily adjust described engine speed according to the load on the described engine.Therefore can improve the processing ease and the working efficiency of described engine driven type work machine.
When described load hour, can reduce described engine speed and reduce engine noises by operating described target engine speed selected cell.Therefore, can further reduce noise content, thereby can further improve working environment by described engine driven type work machine generation.When described load hour by reducing described engine speed, can reduce the fuel consumption of described engine, also can reduce the amount of dust that described utensil produces during operation.
Preferably, described a plurality of target engine speeds comprise two target engine speeds, and these two target engine speeds comprise: the intermediate objective engine speed, and described engine can produce peak torque substantially when this intermediate objective engine speed; And high target engine speed, this high target engine speed is higher than described intermediate objective engine speed, and described engine can produce maximum output substantially when this high target engine speed.
Be that described working machine also comprises ideally: clutch, this clutch are used for the output that passes to described utensil from described engine is cut off and engaged; The operative clutch operating unit, this operative clutch operating unit is used to operate described clutch; And operative clutch operation detection sensor, this operative clutch operation detection sensor is used for detection and by described operative clutch operating unit described clutch is placed engagement positio.
In ideal form, only when described operative clutch operation detection sensor when described clutch has placed engagement positio, described control unit is just carried out control based on the target engine speed of described appointment.
Preferably, along with the angle increase of described closure, described control unit increases the target engine speed of described appointment with hierarchical approaches.
Be ideally, described control unit carries out classification and reduces, make the target engine speed of described appointment reduce specified value at every turn, when the result reduces at described solar term angle, described solar term angle decrease in accordance with regulations reduces, and the described regulation at described solar term angle reduce be worth and described target engine speed all is set at the smaller step size value by it with the regulation increment that hierarchical approaches reduces.
In a preferred form, described control unit carries out classification to be increased, make the target engine speed of described appointment increase specified value at every turn, when the result increases at described solar term angle, described solar term angle increasing amount in accordance with regulations increases, and the value added of the described regulation at described solar term angle and described target engine speed all are set at bigger increment size by it with regulation increment that hierarchical approaches increases.
Described control unit carries out the classification increase according to increasing characteristic curve, makes the target engine speed of described appointment increase specified value at every turn, and when the result increased at described solar term angle, described solar term angle increasing amount in accordance with regulations increased; And described control unit carries out classification and reduces according to reducing characteristic curve, makes the target engine speed of described appointment reduce specified value at every turn, and when the result reduced at described solar term angle, described solar term angle decrease in accordance with regulations reduced.Described increase characteristic curve and describedly reduce that characteristic curve can preferably lag behind.
Described working machine also can comprise the target engine speed change operating unit that is used for sending based on personnel operation the Iterim Change order, wherein only when satisfying the condition that described engine driven type work machine turning round, described control unit is another target engine speed according to described change order with the target engine speed Iterim Change of described appointment.
Described working machine preferably also comprises the unit of advancing, this unit of advancing can self-propelled, wherein when satisfying at least one condition from the condition of being carried out operation by utensil and the group that condition constituted advanced in the described unit of advancing, described control unit determines to satisfy the condition that described engine driven type work machine is turning round.
Preferably, the target engine speed of described appointment is the intermediate objective engine speed that described engine can produce peak torque, and another target engine speed is high target engine speed, this high target engine speed is higher than described intermediate objective engine speed, and described engine can produce maximum output when this high target engine speed.
The time durations that continues in personnel operation only, described target engine speed changes operating unit and just preferably sends described change order continuously, and described control unit preferably increases the target engine speed value of described appointment according to the time of sending described change order, and the value after will increasing is as described another target engine speed.
Described working machine also can comprise: body, this body have the described unit of advancing, and described engine is installed on this body; Left and right sides handle, described left and right sides handle extends back from described body; And holding part, this holding part extends between the rear end of described left and right sides handle.Described holding part can comprise from the rear end of described left and right sides handle and holds pillar part about upwardly extending; And grip bar, this grip bar is held about described between the upper end of pillar part and is extended.Described target engine speed selected cell preferably is located at the rearward end of the handle of selecting from the handle of the described left and right sides.
Described working machine can comprise that also the target engine speed of the target engine speed that is used for the described appointment of Iterim Change changes operating unit, and this target engine speed changes operating unit to have and be used for manually operated operation piece.Described operation piece can be located at the position near described target engine speed selected cell, and allows to operate described operation piece with the hand that holds the handle of selecting from the handle of the described left and right sides in this position.
Described working machine also can comprise: bar, this bar are used for operating the element of selecting from described utensil and the described unit of advancing, and this bar is positioned to the rear surface almost parallel with described holding part.Described bar can comprise: left and right sides pole support portion, described left and right sides pole support portion are roughly parallel to respectively and hold pillar part about described; And horizon bar, this horizon bar extends between the upper end of described left and right sides pole support portion, and is roughly parallel to described grip bar.Interval between the pole support portion of the described left and right sides is arranged to littler than the interval of holding about described between the pillar part, provides the operating space thereby hold between pillar part and the described pole support portion described on one of left side and right side.Described operation piece can be arranged in the described operating space.
Described operation piece preferably includes the operating stem that extends back more than described holding part.
Described working machine preferably also comprises: body, this body have the described unit of advancing, and described engine is installed on this body; Handle, this handle extends back from described body; Speed change lever, this speed change lever are located at described handle place, are used to adjust the gait of march of the described unit of advancing; And coupling mechanism, this coupling mechanism is used for the operation of described speed change lever and described target engine speed selected cell is linked.
When the slower-velocity target engine speed of described target engine speed selected cell from described a plurality of target engine speeds moved to the high-speed target engine speed, described coupling mechanism also preferably switched to rotating speed with described speed change lever and reduces side.
Described target engine speed selected cell preferably includes the switch lever that is located at described handle place, and can be by the switch of described switch lever operation.Described coupling mechanism preferably includes the joining portion that is located at described switch lever place, and the joint acceptance division that is located at described speed change lever place.When described switch lever moved, described joining portion preferably engaged with the described acceptance division that engages, thereby described speed change lever is moved with described switch lever.
Described switch lever preferably includes and holds part, this hold part be arranged in described handle holding part near.
Description of drawings
Only describe some preferred embodiment of the present invention in detail hereinafter with reference to accompanying drawing with the form of example, in the accompanying drawing:
Fig. 1 is the left side view according to the engine driven type work machine of first embodiment of the invention;
Fig. 2 is the exemplary system figure of the engine driven type work machine of Fig. 1;
Fig. 3 is the performance plot of the engine of Fig. 2;
Fig. 4 is the stereogram in the zone around the rear portion of the handle of Fig. 1 during from upper right looking;
Fig. 5 is the view in the zone around left back of handle shown in Figure 4 when the direction of arrow 5 is looked;
Fig. 6 is the view in the zone around left back of handle of Fig. 4 when the direction of arrow 6 is looked;
Fig. 7 is a side view, is illustrated in the handle of Fig. 6 and the relation between operative clutch bar and the operative clutch operation detection sensor;
Fig. 8 A to 8C is the view of the exemplary operations of the operative clutch bar of presentation graphs 6 and 7 and travel rod;
To be expression begin flow chart up to the sequential process of control unit executive control program from the start-up function of the engine of Fig. 2 to Fig. 9 constantly;
Figure 10 is the detailed control flow chart of step of the engine speed control program of execution graph 9;
Figure 11 is the figure of action in the control flow chart of expression Figure 10;
Figure 12 is the side view according to the engine driven type work machine of second embodiment of the invention;
Figure 13 is the exemplary system figure of engine driven type work machine shown in Figure 12;
Figure 14 is the partial cross sectional views in the zone around the rear portion of the handle of Figure 12 when look in the left side;
Figure 15 is the planimetric map in the zone around the back of handle of expression Figure 14;
Figure 16 is the side view according to the engine driven type work machine of third embodiment of the invention;
Figure 17 is the exemplary system figure of the engine driven type work machine of Figure 16;
Figure 18 is the figure of the principle control undertaken by control unit shown in Figure 17 of expression;
Figure 19 A and 19B are the control flow charts of control unit shown in Figure 17;
Figure 20 is the detailed control flow chart of the step in the engine speed setting program shown in execution graph 19A and the 19B;
Figure 21 is illustrated in desired value increase correction chart and the desired value used in the control flow chart shown in Figure 20 and reduces correction chart;
Figure 22 is the side view according to the engine driven type work machine of fourth embodiment of the invention;
Figure 23 is the exemplary system figure of engine driven type work machine shown in Figure 22;
Figure 24 is the stereogram in the zone around the rear portion of handle shown in Figure 22 during from upper right looking;
Figure 25 is the enlarged view in the zone around left back of handle shown in Figure 24;
Figure 26 is the view in expression zone around left back of handle shown in Figure 25 when the direction of arrow 26 is looked;
Figure 27 is a stereogram, and handle, the engine speed of expression Figure 25 change the relation between switch and the boosting bar;
Figure 28 is a side view, represents that handle shown in Figure 27, engine speed change the relation between switch and the boosting bar;
Figure 29 is the view in expression zone around left back of handle shown in Figure 24 when the direction of arrow 29 is looked;
Figure 30 is the view in the zone around left back of handle of expression Figure 24 when the direction of arrow 30 is looked;
Figure 31 A to 31D is the view of the exemplary operations of operative clutch bar, travel rod and the boosting bar shown in expression Figure 24 and 27;
Figure 32 is the flow chart of the control undertaken by control unit shown in Figure 23;
Figure 33 is a detailed control flow chart of carrying out the step in the engine speed Iterim Change program shown in Figure 32;
Figure 34 is the figure of the action in the control flow chart shown in Figure 33;
Figure 35 is the flow chart of expression according to the control of first modification of the 4th embodiment's control unit;
Figure 36 is the figure of the action carried out in the control flow chart of expression Figure 35;
Figure 37 is the exemplary system figure according to second modification of the 4th embodiment's engine driven type work machine;
The flow chart of Figure 38 A to 38C control that to be expression undertaken by the control unit of Figure 37;
Figure 39 A to 39C is the flow chart of expression according to the control of the control unit of the 4th embodiment's the 3rd modification;
Figure 40 is the left side view according to the engine driven type work machine of fifth embodiment of the invention;
Figure 41 is the exemplary system figure of engine driven type work machine shown in Figure 40;
Figure 42 is the stereogram in the zone around the rear portion of expression handle shown in Figure 40 during from upper right looking;
Figure 43 is the enlarged view in the zone around left back of handle of Figure 42;
Figure 44 is the view in the zone around left back of handle of expression Figure 43 when the direction of arrow 44 is looked;
Figure 45 is a stereogram, the relation between handle, speed change lever, switch lever, rotary mode switch and the coupling mechanism of expression Figure 44;
Figure 46 is a stereogram, the relation between handle, speed change lever, switch lever, rotary mode switch and the coupling mechanism of expression Figure 45;
Figure 47 is the view in expression zone around left back of handle shown in Figure 42 when the direction of arrow 47 is looked;
Figure 48 is the view in expression zone around left back of handle shown in Figure 42 when the direction of arrow 48 is looked; And
Figure 49 A to 49F is the view of the exemplary operations of operative clutch bar, travel rod, speed change lever and the switch lever shown in expression Figure 44 to 46.
Embodiment
Hereinafter will utilize the example of back-walking type mowing machine, describe first embodiment based on Fig. 1 to 11C as engine driven type work machine.
Fig. 1 represents the structure of first embodiment's back-walking type mowing machine 10 when look in the left side.First embodiment's back-walking type mowing machine 10 is a kind of engine driven type work machines, and it utilizes handle 17 to handle by walking operator, and the self-propelled by the output of engine 14.Back-walking type mowing machine 10 is made of shell 11, left and right sides front-wheel 12, left and right sides trailing wheel 13, engine 14, cutter 15, handle 17, operating unit 18, service braking/clutch unit 21 and the speed change gear 25 of advancing that lower surface opens wide.
Trailing wheel 13 is according to the advance unit of advancing of (self-propelled is provided) of the output of engine 14.Hereinafter trailing wheel 13 will be called as " unit 13 of advancing " in due course.
Cutter 15 (cutting blade 15) is the utensil that is used to carry out cutting operation, and it is arranged in shell 11 inside and is installed on the underpart of output shaft 19 via service braking/clutch unit 21.Hereinafter cutter 15 will be called as " utensil 15 " in due course.
As illustrated in fig. 1 and 2, service braking/clutch unit 21 has composite structure, has wherein made up " clutch part " and " braking part ".Clutch part will pass to the output cut-out and the joint of cutter 15 from engine 14.Braking part is in dissengaged positions in clutch part and (breaks away from; The transmission of output is cut off) motion of time restriction cutter 15.Service braking/clutch unit 21 has known structure.Hereinafter service braking/clutch unit 21 will be called as " clutch 21 " in due course.
As illustrated in fig. 1 and 2, the speed change gear 25 of advancing (hereinafter referred is " speed change gear 25 ") has the shifting arm 25a that is used for variable speed operation, and input shaft is connected to the output shaft 19 of engine 14 via driving mechanism 22, and output shaft is connected to left and right sides trailing wheel 13 via axle 26.Speed change lever 62 is connected to shifting arm 25a via gear cable 27.
Specifically, the rotating speed of 25 pairs of trailing wheels 13 of speed change gear carries out from zero (stopping) to high-revolving stepless change.Thereby speed change gear 25 has so-called clutch function, is used for the output that passes to trailing wheel 13 from engine 14 is cut off and engaged (that is, by cutting off transmission trailing wheel 13 is stopped, and make trailing wheel 13 rotations by engaging transmission).
Below operating unit 18 will be described.As illustrated in fig. 1 and 2, operating unit 18 has speed change lever 62, main switch 64, rotary mode switch 65 and operative clutch operation detection sensor 68.
Operative clutch operation detection sensor 68 detects the bonding operation of clutch 21 by utilizing operative clutch bar 41 (that is, the operative clutch operating unit 41).At operation element clutch shaft 41, and when making clutch 21 engage (combination) via clutch cable 122, operative clutch operation detection sensor 68 detects and joints take place also sends testing signal.
The system of engine 14 will be described below.As shown in Figure 2, engine 14 is provided with kick-starter 81, ignition mechanism 82, closure control motor 83, motor driver 84, solar term angle transducer 85, engine turn-sensitive device 86, generator 87, power circuit 88 and control unit 89.Engine 14 is not established battery.
Kick-starter 81 is operator's devices so as to manual starting engine 14, and kick-starter 81 for example is located at the far-end of the flywheel of engine 14.Ignition mechanism 82 is made of spark coil and spark plug (not shown).
Closure control motor 83 (hereinafter referred is " control motor 83 ") for example is made of stepper motor, and is the actuator that is used to drive the opening and closing of the closure 92 that is located on the engine intake 91.Motor driver 84 electric drive controlling motors 83 and motor is placed " connection " or " disconnection " state based on the control signal of control unit 89.
Solar term angle transducer 85 detects the angle of closure 92 and sends testing signal to control unit 89.Engine turn-sensitive device 86 detects the rotating speed (RPM) of engine 14 and sends testing signal to control unit 89.
As clearly visible from the above description, the distinguishing characteristics of engine 14 is to have installed electronic controller 80 (being also referred to as electric regulator or electronic speed regulator) thereon.Electronic controller 80 is based on the control signal of control unit 89, come the rotating speed of Control Engine 14 by the angle of utilizing control motor 83 to adjust closure 92 automatically, and constitute by the structure that is combined to form by control motor 83, motor driver 84, solar term angle transducer 85, engine turn-sensitive device 86, control unit 89 and closure 92.
The control mode of the rotating speed of control unit 89 Control Engine 14 roughly is divided into three Spin Control patterns.These Spin Control patterns limit as described as follows.
The first Spin Control pattern is " idle mode ", is used for engine speed is controlled to the engine speed that obtains idling conditions.The second Spin Control pattern is " stillness mode ", is used for engine speed is controlled to the such engine speed of acquisition, and this moment is by the torque that engine 14 produces maximum substantially (comprising approximate maximum).The 3rd Spin Control pattern is " dynamic mode ", is used for engine speed is controlled to the such engine speed of acquisition, and this moment is by the output that engine 14 produces maximum substantially (comprising approximate maximum).
The characteristic of engine 14 will be described below.Fig. 3 is expression output characteristics and the torque characteristics engine characteristics figure with respect to engine speed, and wherein horizontal axis is represented engine speed, and left vertical axis is represented the output (power) of engine, and right vertical axis is represented the torque of engine output.
Curve Pw is an output characteristic curve, and the output of its expression engine 14 (see figure 2)s is with respect to the characteristic of rotating speed.Curve Tq is a torque characteristic curve, and the torque of its expression engine 14 is with respect to the characteristic of rotating speed.
Pw obviously finds out from output characteristic curve, and the output of engine 14 increases when the rotating speed of engine 14 increases.And obviously find out from torque characteristic curve Tq, produce peak torque Tmax at the engine speed NM place that is lower than engine speed NH, can produce the maximum Pmax of output at engine speed NH place.In other words, torque characteristic curve Tq is the chevron curve substantially, wherein produces peak torque Tmax at engine speed NM place.
The characteristic of this engine 14 is identical with the characteristic of utility engines.
In the present invention, the engine speed NL of engine will be called as " low target engine speed NL " hereinafter during the idling conditions of engine 14.
Engine speed NM when engine 14 can produce peak torque Tmax substantially, the engine speed NM when promptly the torque that produces when engine 14 is maximum Tmax or approximate maximum will be called as " intermediate objective engine speed NM ".
Engine speed NH when engine 14 can produce maximum output Pmax substantially, promptly the engine speed NH of engine 14 will be called as " high target engine speed NH " when engine 14 generations are output as maximum Pmax or approximate maximum.
The size of engine speed NL, NM and NH is relevant according to relation NL＜NM＜NH.
Below the detailed structure of handle shown in Figure 1 17 and operating unit 18 will be described based on Fig. 4 to 7.For the ease of understanding this explanation, the handle 17 and the operating unit 18 of Fig. 4 to 7 (dorsal part of Fig. 1) presentation graphs 1 from the right side.
As shown in Figure 4, handle 17 is by the left and right sides handle 31,32 that makes progress and extend back from shell 11 (see figure 1)s, and the holding part 33 that extends between the rear end of left and right sides handle 31,32 constitutes.
Holding part 33 by from the rear end of left and right sides handle 31,32 upwards and extend forward about hold pillar part 34,35, and about hold the held horizontal bar 36 that extends between the upper end of pillar part 34,35 and constitute.When observing holding part 33 from the front side (direction of arrow Lk Fig. 4) of back-walking type mowing machine 10, the global shape of holding part 33 is down " U " shape substantially.
In the handle 31, operating unit 18 and lid 71 are located on the rearward end 31a leftward.As shown in Figure 1, electronic controller 80 is located on the left side of engine 14 integratedly with vaporizer 93.Therefore can make switch be connected required distribution length minimum with the operating unit 18 on the electronic controller on the left side 80 and the left side.
In addition, in the handle 31, left scaffold 38 is located on the rearward end 31a leftward, and speed change lever scaffold 61 is arranged to more forward than left scaffold 38.In right handles 32, right scaffold 39 is located on the rearward end 32a.
Shown in Fig. 4,6 and 7, operative clutch bar 41 and travel rod 42 are installed on the left and right sides scaffold 38,39 via left and right sides rest pin 111,111, thereby can swing forward and backward.Operative clutch bar 41 and travel rod 42 can be swung independently of one another around left and right sides rest pin 111,111.Operative clutch bar 41 and travel rod 42 are the operation piece that return automatically, and they can swing forward and remain against on the holding part 33 by hand 57,58 (see figure 4)s, and return initial position automatically when the hand 57,58 of operation discharges.
Hereinafter will describe operative clutch bar 41 and travel rod 42 in detail.
Shown in Fig. 4 to 7, operative clutch bar 41 is to be configured as and the approximate operation piece that meets in the rear surface of holding part 33, and by the left and right sides pole support portion 44,45 of narrow perpendicular elongate, and the horizon bar 46 that extends between the upper end portion of left and right sides pole support portion 44,45 constitutes.
The underpart of left and right sides pole support portion 44,45 is installed on rearward end 31a, the 32a, thereby can swing forward and backward by rest pin 111,111.As shown in Figure 4, adopt such structure, wherein when operative clutch bar 41 is swung forward, the shape of left side pole support portion 44 and left approximate meeting of rear surface of holding pillar part 34, the shape of right side pole support portion 45 and right approximate meeting of rear surface of holding pillar part 35, the rear surface of the shape of horizon bar 46 and grip bar 36 is approximate to be met.
Operative clutch bar 41 and operative clutch operation detection sensor 68 are relative to each other in the following manner.As shown in Figure 7, the underpart of left pole support portion 44 has protuberance 112 in the operative clutch bar 41, and this protuberance is outstanding forward from the positions lower than rest pin 111.
Operative clutch operation detection sensor 68 is arranged in towards the position of protuberance 112, and is installed on the left scaffold 38.Operative clutch operation detection sensor 68 for example is made of the limit switch that is provided with push rod 68a.Push rod 68a is directed backwards, thereby towards protuberance 112.When push rod 68a was in releasing state, the contact of limit switch was in " connection " state, and when push rod 68a was highlighted portion 112 and pushes, the contact switched to " disconnection " state.
Operative clutch bar 41 remains in " disengaging " position shown in Figure 7 by the elastic force of Returnning spring (not shown).When operative clutch bar 41 was in " disengaging " position, push rod 68a was pushed by pressing plate 112.Therefore operative clutch operation detection sensor 68 is in " disconnection " state.
Operative clutch bar 41 is as follows with the relation that clutch 21 (see figure 2)s are associated.As shown in Figure 7, clutch 21 constitutes when operative clutch bar 41 is swung forward and just is placed in " connection " state via clutch cable 122.
Specifically, the left pole support portion 44 in the operative clutch bar 41 is provided with button 113, operating stem 114, keeping arm 115, first extension spring 116, rest pin 117, attachment pegs 118, clutch operating arm 121, clutch cable 122 and second extension spring 123.
Keeping arm 115 has locking plate 115a, and keeping arm 115 is such members, and it is pushed via operating stem 114 when button 113 is pressed, and along the clockwise direction swing of Fig. 7.Keeping arm 115 is mounted to can be via rest pin 117 perpendicular to the underpart of left pole support portion 44 and swing.Keeping arm 115 remains on neutral position shown in Figure 7 by first extension spring 116.
The close end 121b of clutch operating arm 121 is installed on the left scaffold 38 via rest pin 111, make clutch operating arm 121 to swing forward and backward, and clutch operating arm 121 remains on neutral position shown in Figure 7 by second extension spring 123.Clutch operating arm 121 has attachment pegs 118 at its distal portion 121a.When the clockwise direction of keeping arm 115 around rest pin 117 along Fig. 7 swung, locking plate 115a remained on the attachment pegs 118.
The rearward end of clutch cable 122 is connected on the distal portion 121a of clutch arm 121 via attachment pegs 118.The front end of clutch cable 122 is connected to the bar of clutch 21 (see figure 1)s.
As shown in Figs. 4-6, travel rod 42 is approximate operation piece that meet in rear surface of its shape and operative clutch bar 41.Travel rod 42 is by the left and right sides pole support portion 52,54 of narrow perpendicular elongate, the horizon bar 55 that between the upper end portion of left and right sides pole support portion 52,54, extends, the left horizon bar 51 that extends left from the lower end of left pole support portion 52, and the right horizon bar 53 that extends to the right from the lower end of right pole support portion 54 constitutes.Left and right horizontal bar 51,53 is installed on rearward end 31a, the 32a via rest pin 111,111, thereby can swing forward and backward.
As shown in Figure 4, adopt such structure, wherein when travel rod 42 is swung forward, the shape of left side pole support portion 52 and left approximate meeting of rear surface of holding pillar part 34, the shape of right side pole support portion 54 and right approximate meeting of rear surface of holding pillar part 35, the rear surface of the shape of horizon bar 55 and grip bar 36 is approximate to be met.
Interval D 2 between the pole support portion 52,54 be arranged to than about the interval D 1 held between the pillar part 34,35 little.Left side pole support portion 52 is arranged on such position, and this position separates gap SP (than left pole support portion 44 more inwardly) with respect to the position of left pole support portion 44 along the width direction of body towards the center.Therefore, when operative clutch bar 41 and travel rod 42 are superimposed upon on the holding part 33, provide the operating space 56 that equates with SP at interval between pillar part 34 and the pole support portion 52 holding on the left side.
When travel rod 42 was swung forward, horizon bar 55 was superimposed upon on the rear surface of horizon bar 46.The operator can be in operating space 56 catches a left side to hold the left pole support portion 44 of pillar part 34 and operative clutch bar 41 with his left hand 57.Also available his right hand 58 of operator is grabbed the horizon bar 55 of the horizon bar 46 of grip bar 36, operative clutch bar 41 and travel rod 42 and is in the same place.
The annexation of travel rod 42, speed change lever 62 and speed change gear 25 (see figure 2)s is as follows.
Shown in Fig. 4 and 6, speed change lever 62 is by constituting near the plate-like portion (dish) 94 of dish type with from the upwardly extending operating stem of the upper end portion 94a portion 95 of plate-like portion 94.When from front surface (direction of arrow Lk Fig. 4) when watching plate-like portion 94, plate-like portion 94 forms fork-shaped (form of bifurcation), and speed change lever arm 63 is arranged in the space between the fork.
Plate-like portion 94 and speed change lever arm 63 all are installed on the speed change lever scaffold 61 of left handle 31 via rest pin 96, thereby can swing forward and backward.Speed change lever arm 63 is narrow elongate articles, its extend to than rest pin 96 more by under the position.Plate-like portion 94 and speed change lever arm 63 can relative to each other be swung forward and backward.
As shown in Figure 6, plate-like portion 94 has narrow elongated first guide hole 98, and this first guide hole has around the shape of rest pin 96 bendings.The radius of first guide hole 98 is arranged to increase gradually from the rearward end forward end.In other words, the big (R1＜R2) of the radius R 1 of the rearward end of radius R 2 to the first guide holes 98 of the front end of first guide hole 98.
Speed change lever arm 63 has second guide hole 99, and this second guide hole is narrow and be basically perpendicular to first guide hole 98 and extend downwards.
The Internal cable 27a of gear cable 27 has connecting pin 101 in its back-end.Connecting pin 101 is assemblied in first guide hole 98 and second guide hole 99.The front end of the Internal cable 27a of gear cable 27 is connected to the shifting arm 25a of speed change gear 25.
Shown in Fig. 4 and 6, left handle 31 is provided with supporting arm 102.Supporting arm 102 is arranged in the position more forward than speed change lever arm 63.Horizon bar 51 in the travel rod 42 is provided with the arm 105 of advancing.Position after the arm 105 of advancing is arranged in and more leans on than speed change lever arm 63, and can be with travel rod 42 around rest pin 111 forward and swing backward.
First extension spring 103 (Returnning spring) is located between the distal portion of supporting arm 102 and speed change lever arm 63.The distal portion of speed change lever arm 63 also is connected to the arm 105 of advancing via second extension spring 106.
As shown in Figure 5, rotary mode switch 65 sends " disconnection " signal (" dynamic mode " switching signal) when the anterior 65b of operating button 65a is pressed, and sends " connection " signal (" stillness mode " switching signal) when the rear portion of operating button 65a 65c is pressed.
Therefore, the operator can be set in " dynamic mode " or " stillness mode " by operation rotary mode switch 65 with the control mode of engine 14 according to the working condition of back-walking type mowing machine 10.When carrying out operation in " dynamic mode ", the operator can be with his the anterior 65b of left hand 57 (see figure 4) push button 65a.When carrying out operation in " stillness mode ", the operator can be with his the rear portion 65c of left hand 57 push button 65a.
Shown in Figure 4 and 5, lid 71 forms in planimetric map and substantially is the shape of rectangle, and this lid is installed on the rearward end 31a of left handle 31.Lid 71 has speed change lever hole 73, main switch hole 74 and switch mounting hole 75 in the upper surface 72 of lid 71.Speed change lever hole 73 is passed by the operating stem portion 95 of speed change lever 62, speed change lever hole 73 be arranged in upper surface 72 outer ledge 72a near.The operating button 64a of main switch 64 passes main switch hole 74.The operating button 65a of rotary mode switch 65 passes switch mounting hole 75, switch mounting hole 75 be arranged in upper surface 72 inside edge 72b near.
As mentioned above, main switch 64, rotary mode switch 65 and operative clutch operation detection sensor 68 are arranged in the left handle 31.Electric elements except that electric elements 64,65 and 68 (comprising control unit 89) is arranged in shell 11 (see figure 1)s.
A plurality of bunch of the electric elements from electric elements 64,65 and 68 guiding shells 11 can be bundled together along left handle 31 with gear cable 27 and clutch cable 122.Therefore cable 27 and 122 and bunch can be subjected to adequately protecting of left handle 31.Bunch also can be subjected to the protection of cable 27 and 122.
To and the operation example of operative clutch bar 41 and travel rod 42 be described with reference to Fig. 2 based on Fig. 6 to 8C below.
Fig. 7 represents that wherein operative clutch bar 41 and travel rod 42 all are in the state of " disconnection " position.Because operative clutch bar 41 is in " disconnection " position, so the clutch part of clutch 21 remains on " disconnection " state, braking part remains on " connection " state.Because operative clutch bar 41 is in " disconnection " position, so pressing plate 112 promotes push rod 68a.As a result, operative clutch operation detection sensor 68 is in " disconnection " state.In addition, because travel rod 42 is in " disconnection " position, so speed change gear 25 is in the separated state of output that wherein passes to trailing wheel 13 from engine 14.
Then, after main switch shown in Figure 2 64 placed " connection " position, the handle of kick-starter 81 (knob) 81a was pulled, and starts engine 14 whereby.As shown in Figure 7, because operative clutch bar 41 is maintained at " disconnection " position, so operative clutch operation detection sensor 68 is in " disconnection " state.Therefore the Spin Control pattern of engine 14 is " idle mode ".At this moment, clutch 21 is in " disconnection " state, so cutter 15 stops.Because travel rod 42 is maintained at " disconnection " position, advancing of back-walking type mowing machine 10 stops.
Operative clutch bar 41 and travel rod 42 are swung forward then.As a result, operative clutch bar 41 and travel rod 42 are superimposed upon on the holding part 33, shown in Fig. 8 A.This superposed positions is " connection " position.
Operative clutch bar 41 moves to " connection " position from " disconnection " position, thereby protuberance 112 separates with the push rod 68a of operative clutch operation detection sensor 68 backward.As a result, operative clutch operation detection sensor 68 places " connection " state.Button 113 is not pressed, so clutch 21 remains on " disconnection " state.
When travel rod 42 when " disconnection " position swings to " connection " position, the arm 105 of advancing is swung backward and via second extension spring 106 speed change lever arm 63 is pulled back around rest pin 111, as shown in Figure 6.Speed change lever arm 63 is along the swing of the clockwise direction of Fig. 6 and connecting pin 101 is moved backward, thus the Internal cable 27a of pulling gear cable 27.Therefore speed change gear 25 (see figure 2)s are delivered to trailing wheel 13 with the output of engine 14.As a result, trailing wheel 13 rotations, so back-walking type mowing machine 10 is advanced forward.
As mentioned above, the radius of first guide hole 98 is set for from the rearward end forward end increases gradually.
Like this, the gait of march of back-walking type mowing machine 10 changes according to the oscillating quantity of speed change lever 62.
To describe an example below, wherein when back-walking type mowing machine 10 is advanced, make cutter 15 rotations.
Be at operative clutch bar 41 under the state of " disconnection " position, when button 113 was pressed, the clockwise direction swing of keeping arm 115 around rest pin 117 along Fig. 8 B was shown in Fig. 8 B.As a result, locking plate 115a is clipped on the attachment pegs 118 and locking.
Under lock state, when operative clutch bar 41 was swung forward, clutch cable 122 is swung and spurred to clutch operating arm 121 along clockwise direction around rest pin 111, shown in Fig. 8 C.Therefore, in clutch 21 (see figure 2)s, braking part is placed in " disconnection " position, and clutch part is placed in " connection " position.As a result, cutter 15 rotations.
Like this, can pull back clutch cable 122 by operative clutch bar 41 is swung forward.As a result, clutch 21 is placed in jointing state.
By making operative clutch bar 41 move to " connection " position, protuberance 112 is separated backward with the push rod 68a of operative clutch operation detection sensor 68 from " disconnection " position.As a result, operative clutch operation detection sensor 68 places " connection " state.
Below will be based on Fig. 9 and 10 and be described in sequence of operation and the control flow that takes place when above-mentioned control unit 89 shown in Figure 2 is microcomputer with reference to Fig. 2 and 3.
At first based on Fig. 9 describe from engine 14 startings the time be carved into the sequence of operation in the moment of control unit 89 executive control programs.
Step (hereinafter being abbreviated as ST) ST01: the operator connects main switch 64.
ST02: under " connection " state of main switch 64, the operator utilizes kick-starter 81 to carry out start-up function by the handle 81a of pulling kick-starter 81.
ST03: start engine 14 by the start-up function of kick-starter 81.
ST04: when engine 14 startings, generator 87 begins generating.
ST05: the output voltage of generator 87 reaches the burning voltage that is equal to or higher than certain value, thereby activates control unit 89 automatically by the electric power of supplying with from generator 87.
ST06: control unit 89 was carried out initial setting program before the initialization specified control.
ST07: control unit 89 automatically performs " the engine speed control program " that begin this moment.The concrete control sequence that is used to carry out the engine speed control program has been shown among Figure 10.
Figure 10 is the control flow chart that is used for control unit 89, and shows the control flow of carrying out step ST07 shown in Figure 9 " engine speed control program " for control unit 89.
ST11: the switching signal of read switch.Specifically, read the signal of rotary mode switch 65 and operative clutch operation detection sensor 68.
ST12: whether operative clutch bar 41 is in " disconnection " position makes an appraisal, and in the result when being, determine to carry out " idle mode ", handle advancing to ST13.For not the time, handle advancing to ST14 in the result.As shown in Figure 7, when the operator with his hand when operative clutch bar 41 is removed, the position of operative clutch bar 41 is in " disconnection " position.Determine the position of operative clutch bar 41 according to the testing signal of operative clutch operation detection sensor 68.
ST13: because the Spin Control pattern of engine 14 changes " idle mode " into, so the target engine speed Nt of engine 14 is set to low target engine speed NL.Low target engine speed NL is and the corresponding default engine speed of appointment of the rotating speed of engine 14 under the idling conditions, as shown in Figure 3.
ST14: whether the Spin Control pattern to engine 14 is that " stillness mode " makes an appraisal, and when being, handles advancing to ST15 in the result., determine to carry out " dynamic mode " for not the time in the result, handle advancing to ST16.In ST14, when rotary mode switch 65 is connected, be defined as being, and when rotary mode switch 65 disconnects, be defined as not.
ST15: because the Spin Control pattern of engine 14 is converted into " stillness mode ", so the target engine speed Nt of engine 14 is set to intermediate objective engine speed NM.Intermediate objective engine speed NM is the default engine speed of the corresponding appointment of the engine speed NM in the time of can producing peak torque Tmax substantially with engine 14, as shown in Figure 3.
ST16: because the Spin Control pattern of engine 14 is converted into " dynamic mode ", so the target engine speed Nt of engine 14 is set to high target engine speed NH.High target engine speed NH is the corresponding default engine speed of appointment of engine speed NH in the time of can producing maximum output Pmax substantially with engine 14, as shown in Figure 3.
As from above-mentioned ST13, ST15 and ST16 clear as can be known, target engine speed Nt is set at three values that comprise low target engine speed NL, intermediate objective engine speed NM and high target engine speed NH with hierarchical approaches.Intermediate objective engine speed NM is higher than low target engine speed NL, and high target engine speed NH is higher than intermediate objective engine speed NM (NL＜NM＜NH).
ST17: measure actual engine speed Nr (hereinafter referred to as " actual engine rotational speed N r ") by engine turn-sensitive device 86.
ST18: whether actual engine rotational speed N r is lower than target engine speed Nt makes an appraisal, when being, handle advancing to ST19 in the result.For not the time, handle advancing to ST20 in the result.
ST19: along direct rotational direction drive controlling motor 83, thus opening throttle 92.As a result, actual engine rotational speed N r increases.
ST20: along despining direction drive controlling motor 83, thus close the throttle 92.As a result, actual engine rotational speed N r reduces.
ST21: the switching signal that reads main switch 64.
ST22: whether main switch 64 connected make an appraisal, when being, determine that engine 14 works on, handle and return ST11 in the result., determine engine 14 have been sent to cease and desist order for not the time in the result, handle advancing to ST23.
ST23: after engine 14 stops, according to the control end of above-mentioned control flow.
Below will introduction utilizes the operation of the back-walking type mowing machine 10 (engine driven type work machine 10) that the control flow chart of Figure 10 describes based on Figure 11 and with reference to Fig. 2.
Figure 11 is the time diagram of horizontal axis express time wherein, shows the operation of each parts in the back-walking type mowing machine 10.
When operative clutch bar 41 was in " disconnection " position, the Spin Control pattern of engine 14 was " idle mode ", and with whether operate rotary mode switch 65 irrelevant (ST12 of Figure 10).Therefore, the target engine speed Nt of engine 14 remains on low target engine speed NL (ST13 of Figure 10).
When rotary mode switch 65 is in " connection " state, and when operative clutch bar 41 when time t1 places " connection " position, the Spin Control pattern of engine 14 becomes " stillness mode " (ST12 of Figure 10 and ST14).Therefore, the target engine speed Nt of engine 14 becomes intermediate objective engine speed NM (ST15 of Figure 10).
When rotary mode switch 65 subsequently when time t2 disconnects, the Spin Control pattern of engine 14 becomes " dynamic mode " (ST14 of Figure 10).Therefore, the target engine speed Nt of engine 14 becomes high target engine speed NH (ST16 of Figure 10).
When operative clutch bar 41 subsequently when time t3 places " disconnection " position, the Spin Control pattern of engine 14 becomes " idle mode " (ST12 of Figure 10).Therefore, the target engine speed Nt of engine 14 becomes low target engine speed NL (ST13 of Figure 10).
To utilize walk type to plough the example of machine below, describe second embodiment based on Figure 12 to 15 as engine driven type work machine.Same reference numerals is used to represent identical with first embodiment shown in Fig. 1 to 11 in a second embodiment structure and action, and omits the description to it.
Shown in Figure 12 and 13, it is a kind of engine driven type work machines that second embodiment's walk type is ploughed machine 200, and it utilizes handle 221 to handle by walking operator, and advances (self-propelled) by the output of engine 14.Walk type is ploughed machine 200 and is ploughed plate 206, drag strut 207, a pair of left and right sides handle 221 and operating unit 230 and constituted by housing 201, engine 14, clutch 202, driving mechanism 203, cultivated arbor 204, the first cultivated plate 205, second.
Second embodiment's engine 14 is installed on the top of housing 201, and engine 14 is the power sources with output shaft 19, and this output shaft 19 extends downwards from the underpart of engine 14.
As mentioned above, housing 201 is provided with engine 14, driving mechanism 203, first is ploughed plate 205 and second and ploughed plate 206, drag strut 207 and other critical pieces, therefore also ploughs the body (framework) of machine 200 as walk type.Hereinafter housing 201 will be called as " body 201 " in due course, or " framework 201 ".
Described to left and right sides handle 221 upwards and extend back from the rear portion of housing 201, and locate in its back-end to be provided with and hold part 222.Operating unit 230 be located at left handle 221 hold part 222 near.
The cultivated machine 200 of walk type with this structure is that machine is ploughed in undersized walk type self-propelled, and it utilizes first to plough the rotation arable land that plate 205 and second is ploughed plate 206, and utilizes the first cultivated plate 205 and second to plough plate 206 and advance.Walk type is ploughed machine 200 and is called as preceding tooth-like agricultural cultivated machine.First ploughs plate 205 and second ploughs plate 206 as advancing the unit.Hereinafter the first cultivated plate 205 and the second cultivated plate 206 will be called as " utensil 205,206 " or " unit 205,206 of advancing " in due course.
The zone on every side, rear portion of left handle 221 will be described below, and the detailed structure of operating unit 230.
Shown in Figure 14 and 15, operating unit 230 is provided with main switch 64, rotary mode switch 65, operative clutch bar 231 (operative clutch operating unit 231), operative clutch operation detection sensor 68 and covers 232.
Operative clutch bar 231 is operation piece, can by with operative clutch bar 231 with hold part 222 and be grasped in the operated clutch of coming together, and operative clutch bar 231 is connected to clutch 202 (seeing Figure 12) via clutch cable 233.Specifically, operative clutch bar 231 is the members according to the mode operated clutch 202 identical with the operative clutch bar 41 shown in Fig. 1 to 11.
Operative clutch operation detection sensor 68 detects the bonding operation of clutch 202 by using operative clutch bar 231, and for example is made of limit switch.When making clutch 202 engage (combination) at operation element clutch shaft 231 and via clutch cable 233, operative clutch operation detection sensor 68 detects and takes place to engage and send testing signal to control unit shown in Figure 13 89.
As shown in figure 14, the operator with his hand when operative clutch bar 231 is removed, operative clutch bar 231 is in " disconnection " position.When the operator with operative clutch bar 231 with when holding part 222 and being grasped in together and making operative clutch bar 231 along the direction swing of arrow UP, operative clutch bar 231 is in " connection " position.
As shown in figure 12, the control unit 89 that is installed on the cultivated machine 200 of walk type has structure shown in Figure 10 and 11 and operation.Therefore, the cultivated machine 200 of walk type carries out action shown in Figure 11.
First and second embodiments' description is summarized as follows.
Shown in Fig. 2 and 13, in first and second embodiments, in control unit 89, preset the value of a plurality of target engine speed Nt with hierarchical approaches.The operator can select single target engine speed Nt arbitrarily from a plurality of target engine speed Nt that set with hierarchical approaches, and Action Target engine speed selected cell 65 (rotary mode switch 65).Target engine speed selected cell 65 is specified selected single target engine speed Nt to control unit 89.Electric control is carried out in the opening and closing of 89 pairs of closures 92 of control unit, makes the actual engine rotational speed N r of engine 14 meet the target engine speed Nt of appointment.Like this operator can be by Action Target engine speed selected cell 65 only and special speed change easily to the target engine speed Nt of selected value.Therefore, operate the solar term bar the operator needn't resemble in the prior art and target engine speed Nt is finely tuned.
For example, even when owing to being applied to load notable change on the utensil 15,205,206 and making the load notable change that is applied on the engine 14, the operator also can easily adjust actual engine rotational speed N r according to the load on the engine.Therefore can improve the processing ease and the working efficiency of engine driven type work machine 10,200.
When load hour, can reduce actual engine rotational speed N r by Action Target engine speed selected cell 65 and reduce engine noises.As a result, can further reduce noise content, thereby can further improve working environment by engine driven type work machine 10,200 generations.When load hour, by reducing actual engine rotational speed N r, can reduce the fuel consumption of engine 14, also can reduce the amount of dust that utensil 15,205,206 produces during operation.
In addition, in first and second embodiments, the value of a plurality of target engine speed Nt that selected by target engine speed selected cell 65 is set at two values that comprise intermediate objective engine speed NM and high target engine speed NH.Intermediate objective engine speed NM is set at the engine speed when engine 14 can produce peak torque Tmax substantially.High target engine speed NH is set at the engine speed when engine 14 can produce maximum output Pmax substantially.
Load on engine 14 hour, even when carrying out operation under the state that actual engine rotational speed N r reduces, the output of engine 14 is also enough.Can be by target engine speed Nt is set at intermediate objective engine speed NM with high torque (HT) driving implement 15,205,206.Therefore can be fully in response to the load change on the utensil 15,205,206.
In addition, by target engine speed Nt is switched to intermediate objective engine speed NM, can reduce actual engine rotational speed N t, thereby can reduce engine noises.
When the load on the engine 14 is big (for example, when grow grass in cutting and when other uses in the situation of mowing machine 10), target engine speed Nt switches to high target engine speed NH.Therefore, actual engine rotational speed N r increases, and carries out operation effectively under the state that can increase in the output of engine 14.
Like this, when the load notable change on the engine 14 between the operational period of engine driven type work machine 10,200, the operator can be switched actual engine rotational speed N r comprising between two ranks of intermediate speed NM and high rotational speed N H easily according to load.Target engine speed selected cell 65 is only selected two other rotating speeds of level.Therefore select target engine speed Nt especially easily.
In addition, in first and second embodiments, when utilizing operative clutch operating unit 41,231 that clutch 21,202 is engaged, operative clutch operation detection sensor 68 can detect the generation bonding operation reliably.Therefore can detect the working state (job state or halted state) of the utensil 15,205,206 of the output services that utilize engine 14 reliably.
To utilize the example of back-walking type mowing machine below, describe the 3rd embodiment based on Figure 16 to 21 as engine driven type work machine.Same reference numerals is used for being illustrated in the 3rd embodiment structure and the action identical with first embodiment shown in Fig. 1 to 11, and omits the description to it.
The 3rd embodiment's back-walking type mowing machine 10 has the essentially identical basic structure with first embodiment.Shown in Figure 16 and 17, saved first embodiment's rotary mode switch 65 (see figure 2)s, and revised the structure of control unit 89.
The control mode of the rotating speed of the 3rd embodiment's control unit 89 Control Engine 14 roughly is divided into two Spin Control patterns.The qualification as described below of these Spin Control patterns.
The first Spin Control pattern is " idle mode ", is used for engine speed is controlled to the engine speed that obtains idling conditions.The second Spin Control pattern is " work pattern ", and wherein operation element clutch shaft 41 makes clutch 21 engage (combination), thereby controls the engine speed that carries out the state of operation with the torque that obtains to utilize engine 14 to produce.
Below will be based on the control principle of Figure 18 description control unit 89 according to the rotating speed of work pattern Control Engine 14.
Figure 18 is the schematic diagram of the control carried out of the control unit by the 3rd embodiment, and wherein horizontal axis is represented throttle valve angle Thr (deg.), and vertical axis is represented the output production rate Rop (%) of engine.Based on the target engine speed of engine and the output production rate Rop of throttle valve angle Thr computing engines.
The target engine speed of for example representing engine 14 by five characteristic curve Nt1 to Nt5.In these characteristic curves, the target engine speed minimum of characteristic curve Nt1, characteristic target engine speed increases (Nt1＜Nt2＜Nt3＜Nt4＜Nt5) with the order of Nt1, Nt2, Nt3, Nt4, Nt5.
Characteristic curve Nt1 is the characteristic curve of target engine speed that is in the engine 14 of idle mode.Other characteristic curves Nt2 to Nt5 is the characteristic curve of target engine speed that is in the engine 14 of work pattern.According to characteristic curve Nt1 to Nt5, when the target engine speed increased, the output production rate Rop of engine was tending towards reducing with respect to throttle valve angle Thr.
Here the output production rate Rop of engine 14 (seeing Figure 17) is the value (parameter) of the magnitude of load on the expression engine 14.Load on the bigger expression engine 14 of output production rate Rop is bigger.
When the target engine speed was constant, along with the angle Thr increase of closure 92 (seeing Figure 17), output production rate Rop increased.Even such reason is when to be the rotating speed at engine 14 constant, along with the angle Thr of closure 92 increases, the output of engine 14 also increases usually.In other words, output production rate Rop increases.When angle Thr is maximum, output production rate Rop maximum (100%).
In back-walking type mowing machine 10 shown in Figure 17, the load when cutter 15 begins to mow on the engine 14 increases.At this moment control unit 89 is controlled the angle Thr with increase closure 92, thereby the actual speed of engine 14 is remained on the current target engine speed.As a result, output production rate Rop increases.
For example, when the target engine speed for example is Nt2,, then exports production rate Rop and have approximate 78% higher value in case angle Thr is 30 degree.At this moment, when the target engine speed when Nt2 is increased to Nt3, even be 30 when spending at angle Thr, output production rate Rop also drops to approximate 68%.Because when the actual speed of engine 14 increases, the output that engine 14 produces increases, so output production rate Rop descends.Engine 14 can respond load fully.
When the target engine speed is Nt3,, then exports production rate Rop and have approximate 39% smaller value in case angle Thr is 20 degree.At this moment, when the target engine speed when Nt3 is reduced to Nt2, even be 20 when spending at angle Thr, output production rate Rop also drops to approximate 52%.Output production rate Rop still keeps less.In other words, because the load on the engine 14 reduces,, the target engine speed can not produce any problem so being decreased to Nt2.By reducing the target engine speed, can reduce engine noises, and improve fuel efficiency.
Though by the actual speed of control unit 89 Control Engine 14, the target engine speed of the angle Thr of closure 92 and engine 14 can be set at the optimum value of the optimum output production rate Rop that considers engine 14.As a result, engine 14 can be worked under optimal situation.
Thereby the angle Thr of automatic setting closure 92 make the operator needn't be at every turn between operational period during the load change on the engine 14 operation solar term bar the target engine speed of engine 14 is adjusted to appropriate value.
The 3rd embodiment constitutes based on the rotating speed of above-mentioned control principle by control unit 89 Control Engine 14.
The control flow that is undertaken by control unit shown in Figure 17 89 will be described below.From engine 14 starting the time be carved into the sequence of operation and first embodiment shown in Figure 9 in the moment of control unit 89 executive control programs identically, and omission is to its description.
Figure 19 A is the control flow chart (main program) according to the 3rd embodiment's control unit 89, and shows the basic controlling flow process of carrying out step ST07 shown in Figure 9 " engine speed control program " for control unit 89.
ST111: the signal that reads operative clutch operation detection sensor 68.
ST112: whether operative clutch bar 41 is in " disconnection " position makes an appraisal, and in the result when being, determine to carry out " idle mode ", handle advancing to ST113., determine to carry out " work pattern " for not the time in the result, handle advancing to ST116.As shown in Figure 7, when the operator with his hand when operative clutch bar 41 is removed, the position of operative clutch bar 41 is in " disconnection " position.Determine the position of operative clutch bar 41 according to the testing signal of operative clutch operation detection sensor 68.
ST113: because the Spin Control pattern of engine 14 changes " idle mode " into, so the target engine speed Nt of engine 14 is set at idle running desired value Nid.Idle running desired value Nid is that engine speed is preset in the appointment corresponding with the rotating speed of idling conditions engine 14 down.The value of idle running desired value Nid is identical with the value of first embodiment's low target engine speed NL (seeing the ST13 of Fig. 3 and Figure 10).
ST114: the angle Thr that measures closure 92 by solar term angle transducer 85.
ST115: the initial value of measuring in ST114 is that 0 " previous solar term angle Tho " is updated to after new angle Thr (the new angle Thr) value, and processing advancing to ST119.In other words, " the new angle Thr " that obtains among the ST114 is stored in the storage as " previous solar term angle Tho ".
ST116: because the Spin Control pattern of engine 14 be " work pattern ", estimate from the moment that " disconnection " position switches to " connection " position so whether the time has been arrived operative clutch bar 41, and when the result when being, processing advancing to ST117.When the result for not the time, handle advancing to ST118.When the time is in the moment that operative clutch bar 41 connects, be defined as be.When " connection " operation of operative clutch bar 41 continued from the previous moment, be defined as not.
ST117: " the previous desired value Nwo between operational period " is initially set the value of certain default " activity duration initial target value Nwi ", and handles and advance to ST118.Like this, only when placing " connection " position, operative clutch bar 41 just the initial value of " the previous desired value Nwo between operational period " is set at activity duration initial target value Nwi.Previous desired value Nwo between operational period is used for ST205, ST206, ST209 and the ST210 of Figure 20 hereinafter described.
ST118: carry out " engine speed setting program ", thereby be set in the target engine speed Nt of the engine 14 work pattern under, processing advances to ST119 then.The subroutine of concrete execution ST11 has been shown among Figure 20 hereinafter described.
ST119: the actual engine rotational speed N r that measures engine 14 by engine turn-sensitive device 86.
ST120: whether actual engine rotational speed N r is lower than the target engine speed Nt that sets makes an appraisal in ST113 or ST118, when being, handle advancing to ST121 in the result.For not the time, handle advancing to ST122 in the result.
ST121: along direct rotational direction drive controlling motor 83, thus opening throttle 92.As a result, actual engine rotational speed N r increases.
ST122: along despining direction drive controlling motor 83, thus close the throttle 92.As a result, actual engine rotational speed N r reduces.
ST123: the switching signal that reads main switch 64.
ST124: whether main switch 64 connected make an appraisal, when being, determine that engine 14 works on, handle and return ST111 in the result., determine engine 14 have been sent to cease and desist order for not the time in the result, handle advancing to ST125.
ST125: after engine 14 stops, according to the control end of above-mentioned control flow.
In the 3rd embodiment, can adopt the structure of modified example, comprising the rotary mode switch 65 of first embodiment shown in Fig. 1 and 2 of unmodified.The structure of first embodiment shown in Fig. 1 and 2 is used for the modified example according to the 3rd embodiment.But, revised the structure of control unit 89.
In the 3rd embodiment's modification, the control mode of the rotating speed of control unit 89 Control Engine 14 comprises following three general Spin Control patterns: " idle mode ", " stillness mode " and " dynamic mode " are identical with first embodiment.
Figure 19 B is the flow chart of the control (main program) undertaken by the control unit 89 according to the 3rd embodiment's modification.In this modification, provide ST14A, ST116A, ST116B, ST117A and the ST117B shown in Figure 19 B to replace ST116 to ST117 in the control flow chart shown in Figure 19 A.
ST111: the switching signal of read switch.Specifically, read the signal of rotary mode switch 65 and operative clutch operation detection sensor 68.
ST112: whether operative clutch bar 41 is in " disconnection " position makes an appraisal, and in the result when being, determine to carry out " idle mode ", handle advancing to ST113.For not the time, handle advancing to ST14A in the result.
ST113: identical with the ST113 shown in Figure 19 A.
ST114: identical with the ST114 shown in Figure 19 A.
ST115: the initial value of measuring in ST114 is that 0 " previous solar term angle Tho " is updated to after new angle Thr (the new angle Thr) value, and processing advancing to ST119.
ST14A: whether the Spin Control pattern to engine 14 is that " stillness mode " makes an appraisal, when the result when being, handle advancing to ST116A.When the result for not the time, determine to carry out " dynamic mode ", handle advancing to ST116B.In ST14A, when rotary mode switch 65 is connected, be defined as being, and when rotary mode switch 65 disconnects, be defined as not.
ST116A: whether the condition of selecting from the first condition of the following stated and second condition satisfied make an appraisal, when the result when being, processing advancing to ST117A.When the result for not the time, handle advancing to ST118.
First condition is that the time is operative clutch bar 41 switches to " connection " position from " disconnection " position time.Second condition is that the time is the Spin Control pattern switches to stillness mode from dynamic mode time.
Only the time be operative clutch bar 41 connect time the time, perhaps the time for using rotary mode switch 65 when dynamic mode switches to the time of stillness mode, in ST116A, be defined as be.
ST117A: " the previous desired value Nwo between operational period " is initially set the value of certain default intermediate objective engine speed NM, and handles and advance to ST118.The same with first embodiment shown in Figure 3, the engine speed NM when intermediate objective engine speed NM can produce peak torque Tmax substantially with engine 14 is corresponding.Previous desired value Nwo between operational period is used for ST205, ST206, ST209 and the ST210 of Figure 20 hereinafter described.
ST116B: whether the condition of selecting from the 3rd condition of the following stated and the 4th condition satisfied make an appraisal, when the result when being, processing advancing to ST117B.When the result for not the time, handle advancing to ST118.
The 3rd condition is that the time is operative clutch bar 41 switches to " connection " position from " disconnection " position time.The 4th condition is that the time is the Spin Control pattern switches to dynamic mode from stillness mode time.
Only the time be operative clutch bar 41 connect time the time, perhaps the time for using rotary mode switch 65 when stillness mode switches to the time of dynamic mode, in ST116B, be defined as be.
ST117B: " the previous desired value Nwo between operational period " is initially set the value of certain default high target engine speed NH, and handles and advance to ST118.The same with first embodiment shown in Figure 3, the engine speed NH when high target engine speed NH can produce maximum output Pmax substantially with engine 14 is corresponding.Previous desired value Nwo between operational period is used for ST205, ST206, ST209 and the ST210 of Figure 20 hereinafter described.
ST118: carry out " engine speed setting program ", thereby be set in the target engine speed Nt of the engine 14 stillness mode or dynamic mode under, processing advances to ST119 then.The subroutine of concrete execution ST118 has been shown among Figure 20 hereinafter described.
ST119 to ST125: identical with the ST119 to ST125 shown in Figure 19 A.
To carry out the concrete control flow of the program shown in the ST118 (seeing Figure 19 A and 19B) of the rotating speed that is used for setpoint engine 14 based on Figure 20 description control unit 89 below.
Figure 20 is the flow chart of the control (subroutine) carried out of the control unit 89 by the 3rd embodiment.
ST201: the angle Thr that measures closure 92 by solar term angle transducer 85.
ST202: deduct previous solar term angle Tho from new angle Thr, to calculate poor between previous solar term angle Tho and the new angle Thr, that is, and solar term differential seat angle Δ Th (Δ Th=Thr-Tho).Clearly, when new angle Thr be negative (negative) value less than previous solar term angle Tho time gas differential seat angle Δ Th.
When carrying out " the current circulation " of control flow shown in Figure 20, " new angle Thr " is the new angle Thr of the closure 92 measured in ST201.
When " circulation formerly " of carrying out control flow shown in Figure 20, " previous solar term angle Tho " is the original angle of the closure 92 measured in ST201.Yet only when being defined as not in ST112 (seeing Figure 19 A and 19B), by way of exception, " the previous solar term angle Tho " that obtains in ST115 (seeing Figure 19 A and 19B) is as " previous solar term angle Tho " among the ST202.
ST203: to solar term differential seat angle Δ Th whether greater than " the differential seat angle reference value Thup during increasing " (Δ Th＞Thup) make an appraisal, when the result when being, handle advancing to ST204.When the result for not the time, handle advancing to ST207." the differential seat angle reference value Thup during increasing " is that certain is preset as " just (positive number) " value of determining benchmark when determining whether to increase the rotating speed of engine 14.
ST204: the based target value increases correction chart, and the fresh target value Nwn between the operational period of the angle Thr computing engines 14 of the closure of from ST201, measuring 92 (the fresh target value Nwn between operational period, that is, and fresh target engine speed Nwn).To the details that desired value increases correction chart be described based on Figure 21 below.
ST205: to the fresh target value Nwn between operational period whether greater than the previous desired value Nwo between operational period (Nwn＞Nwo) make an appraisal, when the result when being, handle advancing to ST211.When the result for not the time, handle advancing to ST206.The term here " the previous desired value Nwo between operational period " refers to the precalculated desired value (target engine speed) of the engine 14 between operational period.
ST206:,, handle afterwards and advance to ST211 so the fresh target value Nwn between operational period is updated to the previous desired value Nwo between operational period because among the ST205 " Nwn≤Nwo ".
ST207: to solar term differential seat angle Δ Th whether less than " the differential seat angle reference value Thdw during reducing " (Δ Th＜Thdw) make an appraisal, when the result when being, handle advancing to ST208.When the result for not the time, handle advancing to ST210." the differential seat angle reference value Thdw during reducing " is preset as certain " negative (negative) " value of determining benchmark when determining whether to reduce the rotating speed of engine 14.
ST208: the based target value reduces correction chart, and the fresh target value Nwn between the operational period of the angle Thr computing engines 14 of the closure of from ST201, measuring 92 (the fresh target value Nwn between operational period, that is, and fresh target engine speed Nwn).To the details that desired value reduces correction chart be described based on Figure 21 below.
ST209: to the fresh target value Nwn between operational period whether less than the previous desired value Nwo between operational period (Nwn＜Nwo) make an appraisal, when the result when being, handle advancing to ST211.When the result for not the time, handle advancing to ST210.
Because in ST203 and ST207 " Thdw≤Δ Th≤Thup ", perhaps in ST209 " Nwn 〉=Nwo ", the fresh target value Nwn between operational period is updated to the previous desired value Nwo between operational period, handles advancing to ST211 afterwards.
ST211: the target engine speed Nt of engine 14 is updated to the fresh target value Nwn between operational period.
ST212: previous solar term angle Tho is updated to the new angle Thr that measures among the ST201.
ST213: the previous desired value Nwo between operational period is updated to the fresh target value Nwn between operational period, and the control according to the control flow of Figure 20 afterwards finishes.
To describe below that desired value increases correction chart and desired value reduces correction chart based on Figure 21.
Figure 21 is used for describing according to desired value of the present invention increases correction chart and desired value reduces correction chart, and the desired value increase correction chart and the desired value that obtain the desired value Nwn between the operational period corresponding with angle Thr are shown reduce correction chart.Horizontal axis among Figure 21 is represented throttle valve angle Thr (deg.), and vertical axis is represented the desired value Nwn (rpm) of the engine between operational period.
Among Figure 21, the angle Thr of closure 92 (seeing Figure 17) is set at seven values according to the order increase of Thr1, Thr2, Thr3, Thr4, Thr5, Thr6, Thr7.
The desired value Nwn of the engine 14 (seeing Figure 17) between operational period is set at six values according to the order increase of Nwn1, Nwn2, Nwn3, Nwn4, Nwn5, Nwn6.
Interval from Nwn1 to Nwn2 and interval from Nwn2 to Nwn4 and the interval approximately equal from Nwn4 to Nwn6.The value of Nwn3 is the intermediate value between Nwn2 and the Nwn4.The value of Nwn5 is the intermediate value between Nwn4 and the Nwn6.Therefore the interval between Nwn2, Nwn3, Nwn4, Nwn5 and the Nwn6 is less.
The characteristic curve that the desired value of being represented by solid line increases correction chart is set at and makes that when the angle Thr of closure 92 increase the desired value Nwn of engine 14 increases with hierarchical approaches between operational period.
Specifically, it is such characteristic curve that desired value increases correction chart, and the desired value Nwn between operational period is set at four following increments by this characteristic curve.(during Thr＜Thr3), the desired value Nwn between operational period is made as Nwn1 (Nwn=Nwn1) less than Thr3 as angle Thr.(during Thr3≤Thr＜Thr5), the desired value Nwn between operational period is made as Nwn2 (Nwn=Nwn2) less than Thr5 and more than or equal to Thr3 as angle Thr.Equally, when " Thr5≤Thr＜Thr7 ", set " Nwn=Nwn4 ".When " Thr7≤Thr ", set " Nwn=Nwn6 ".
Be the appointment increasing amount (interval from Thr3 to Thr5 and from Thr5 to Thr7) of angle Thr, and the desired value Nwn between operational period incrementally increases specified interval (from Nwn1 to Nwn2, the interval of Nwn2 to Nwn4 and Nwn4 to Nwn6) bigger space value all is set.
The characteristic curve that the desired value that is illustrated by the broken lines reduces correction chart is set at and makes that the desired value Nwn between operational period incrementally reduces when angle Thr reduces.
Specifically, it is such characteristic curve that desired value reduces correction chart, and the desired value Nwn between operational period is set at six following increments by this characteristic curve.(during Thr＞Thr6), the desired value Nwn between operational period is made as Nwn6 (Nwn=Nwn6) greater than Thr6 as angle Thr.(during Thr5≤Thr＜Thr6), the desired value Nwn between operational period is made as Nwn5 (Nwn=Nwn5) less than Thr6 and more than or equal to Thr5 as angle Thr.Equally, when " Thr4≤Thr＜Thr5 ", set " Nwn=Nwn4 ".When " Thr2≤Thr＜Thr4 ", set " Nwn=Nwn3 ".When " Thr1≤Thr＜Thr2 ", set " Nwn=Nwn2 ".When " Thr＜Thr1 ", set " Nwn=Nwn1 ".
For the appointment decrease of angle Thr (from Thr6 to Thr5, Thr5 to Thr4, Thr4 to Thr2 and Thr2 to the interval of Thr1), and the desired value Nwn between operational period incrementally reduce specified interval (from Nwn6 to Nwn5, Nwn5 to Nwn4, Nwn4 to Nwn3 and Nwn3 to the interval of Nwn2) all set the small incremental value.
As from knowing as can be known the above description that provides, desired value increase correction chart and desired value reduce correction chart can have the characteristic curve that lags behind relative to each other.Desired value increases angle Thr in the correction chart and is located in the scope from Thr3 to Thr7, for example is 20 degree.Desired value reduces angle Thr in the correction chart and is located in the scope from Thr1 to Thr6, for example is 15 degree.
Because interval Nwn1, Nwn2, Nwn4 and Nwn6 between a plurality of increments are made as higher value in advance, so when increasing suddenly the angle Thr that makes closure 92 owing to the load on the engine 14 and increase, can select to have the desired value Nwn (target engine speed Nt) between the operational period of higher value.Therefore can further increase actual engine rotational speed N r, this has caused further increasing the ability of engine output again.Therefore, can be the more unexpected increase of the load on the utensil between operational period 15 be responded.Can further improvement performance, and under the situation that the load on the utensil 15 increases suddenly, can stablize the quality of the operation of being undertaken by utensil 15.
Reduce correction chart according to desired value, when the load on engine 14 reduced, the desired value Nwn between operational period can reduce gradually with small incremental.Therefore, when the load on engine 14 reduces, can expect to reduce engine noises by when abundant response is provided, reducing engine speed.
As shown in figure 20, during load notable change on engine 14, the solar term differential seat angle Δ Th that calculates among the ST202 significantly changes.As a result, determining in ST203 and ST207 frequently changes.Therefore, there is frequent transitions between the desired value Nwn between desired value Nwn and the operational period in ST208, set between the operational period of sometimes in ST204, setting, i.e. vibration.
Therefore in the 3rd embodiment, provide in desired value and increased the hysteresis between the characteristic curve of reducing that the increase characteristic curve of correction chart and desired value reduce correction chart.In addition, the scope that desired value reduces the angle Thr that sets in the characteristic curve of correction chart is bigger than the scope that increases the angle Thr that sets in the characteristic curve of correction chart in desired value, and the quantity increment of setting desired value Nwn between operational period also increases to six.Therefore, can fully limit such situation, wherein reduce to carry out transmission between correction chart setting operational period in the desired value Nwn according to desired value to increase desired value Nwn between correction chart setting operational period according to desired value.
Therefore the actual engine rotational speed N r of engine 14 does not change suddenly between operational period.In other words, can prevent the vibration of actual engine rotational speed N r.Therefore, because can keep the job state of utensil 15 as far as possible, so can improve the operation quality of being undertaken by utensil 15.For example in back-walking type mowing machine 10, can further improve the result who when carrying out cutting operation, obtains.
Summarized below to the 3rd embodiment with according to the description (seeing Figure 17) of the 3rd embodiment's modification.
Shown in Figure 19 A and 20, when operative clutch bar 41 was connected, the 3rd embodiment's control unit 89 is intended target engine speed Nwi (seeing ST112, ST116, ST117 and ST211) from the target engine speed Nt (Nid, Nwi) that a plurality of increments are set.
Shown in Figure 19 B and 20, when operative clutch bar 41 is connected, according to control unit 89 intended target engine speed NM or NH from the target engine speed Nt (Nid, NM, NH) that a plurality of increments are set of the 3rd embodiment's modification.
The control unit 89 of the modification shown in the 3rd embodiment shown in Figure 19 A and Figure 19 B is also controlled the opening and closing of closure 92, makes actual engine rotational speed N r meet the target engine speed Nt (Nwi, NM or NH) (seeing ST119 to ST122) of appointment.
When the opening and closing of control closure 92, angle Thr sharply increases according to the increase of the load on the engine 14.As shown in figure 20, when solar term differential seat angle Δ Th is worth Thup greater than certain, control unit 89 makes the each increment of the target engine speed Nt ground of appointment increase the value (desired value of seeing ST203, ST204, ST211 and Figure 21 increases correction chart) of regulation, and angle Thr increases established amount as a result.
In other words, control unit 89 determines that the load on the engine 14 increases according to the increase of angle Thr, and selects to have the target engine speed Nt (increasing the value that value Nwn1, Nwn2, Nwn4 and Nwn6 the correction chart select from desired value) that increases suitable higher value with load.
Equally, when the opening and closing of control closure 92, the angle Thr of closure 92 sharply reduces according to the reducing of load on the engine 14.As shown in figure 20, when solar term differential seat angle Δ Th was worth Thdw less than certain, control unit 89 made the target engine speed Nt increment ground of appointment reduce (desired value of seeing ST207, ST208, ST211 and Figure 21 reduces correction chart).
In other words, control unit 89 is determined load on the engines 14 according to the reducing of angle Thr, and selects to have the target engine speed Nt (reducing the value that the Nwn1 the correction chart selects to the value in the Nwn6 scope from desired value) that reduces suitable smaller value with load.
Therefore, because the rotating speed of utensil 15 and engine output can reduce gradually, thus the service behaviour of can further improve, and can stablize the operation quality of being undertaken by utensil 15.For example in back-walking type mowing machine 10, can when carrying out cutting operation, continue the effect that keeps good.The working efficiency of engine driven type work machine 10 can be improved like this, and operation can be stably carried out.
In addition because rotating speed reduces, so the noise that engine driven type work machine 10 produces reduce, thereby can improve working environment.Operating solar term pole pair target engine speed the operator needn't resemble in the prior art finely tunes.
To utilize the example of back-walking type mowing machine below, describe the 4th embodiment based on Figure 22 to 34 as engine driven type work machine.Same reference numerals is used for being illustrated in the 4th embodiment structure and the action identical with first embodiment shown in Fig. 1 to 11, and omits the description to it.
Shown in Figure 22 and 23, the 4th embodiment's back-walking type mowing machine 10 has the essentially identical basic structure with first embodiment.The distinguishing characteristics of the 4th embodiment's back-walking type mowing machine 10 is that the operating unit 18 in first embodiment adds the target engine speed and changes operating unit 60, and revises the structure of control unit 89.
The 4th embodiment's control unit 89 receives the signal of main switch 64, rotary mode switch 65, engine speed change switch 66, operative clutch operation detection sensor 68, solar term angle transducer 85 and engine turn-sensitive device 86, and Control Engine 14.
Shown in Figure 22 and 23, the 4th embodiment's operating unit 18 is provided with the target engine speed and changes operating unit 60 (the target engine speed changes unit 60).Target engine speed change unit 60 sends the Iterim Change order according to personnel operation and carries out interim increment change with the target engine speed to engine 14, and the target engine speed changes, and unit 60 changes switch 66 by engine speed and boosting bar 67 constitutes.
Boosting bar 67 be during operation hand when bar is removed, automatically return to initial position return part automatically.Engine speed changes switch 66 and carries out switch according to the operation of boosting bar 67.For example, engine speed changes switch 66 connections when 67 operations of boosting bar, and engine speed changes switch 66 disconnections when boosting bar 67 turns back to initial position.
Shown in Figure 24 to 26, boosting bar 67 be arranged in left handle 31 rearward end 31a neighbouring and left hold pillar part 34 near.
Specifically, speed change lever scaffold 61 has cylindrical end tangs 133, shown in Figure 27 and 28.Boss 133 is provided with rest pin 125.Boosting bar 67 is made of arm 126 and operating stem portion 127.Arm 126 is made of arm plate 128, mounting portion 129 and pressing plate 131.
The middle body of arm plate 128 is installed on the rest pin 125, thereby can swing forward and backward, and is promoted by the counter clockwise direction of torsion spring 134 (Returnning spring) along Figure 28.
The elongated end of the part that the middle body from arm plate 128 of assembly department 129 and arm plate 128 makes progress and extends back is integral.Mounting portion 129 is roughly L shaped, has from the folding horizontal flat part 129a of the width direction of the upper end edge body of arm plate 128, and from the end of flat 129a forward and folding downwards fold section 129b.Operating stem part 127 from flat 129a upwards and extend back and have the part of holding 127a at its far-end.
The elongated end of the part that the middle body from arm plate 128 of pressing plate 131 and arm plate 128 extends forward is integral.Pressing plate 131 is towards the folding horizontal component of speed change lever scaffold 61 from the end of arm plate 128.
Engine speed changes switch 66 in the place ahead that is arranged in boosting bar 67 in the position of pressing plate 131.Engine speed changes switch 66 and for example is made of the limit switch that is provided with push rod 66a.Push rod 66a relatively arranges along downward direction and pressing plate 131.When push rod 66a was in releasing state, the contact of limit switch was " connection ", and when push rod 66a was pushed by pressing plate 131, the contact of limit switch was " disconnection ".
As mentioned above, boosting bar 67 is promoted in the counterclockwise direction by torsion spring 134.Therefore pressing plate 131 remains under the state that push rod 66a is pushed into.
The position relation of the holding part 33 of operating stem part 127 relative handles 17 is as follows.Shown in Figure 24,28 and 29, the part 127a that holds of boosting bar 67 is arranged in the operating space 56.After the far-end that holds part 127a is arranged to hold pillar part 34 and slightly more lean on than a left side.In other words, boosting bar 67 is arranged near in the position of rotary mode switch 65, thereby can operate by the left hand 57 that pillar part 34 is held on a left side of catching holding part 33.
Therefore, when the operator caught a left side to hold pillar part 34 with his left hand 57, the operator can move to the thumb 57a that makes him operating space 56 by the thumb 57a with him and hang over and hold on the part 127a from holding part 33 rears.In this state, can promote to hold part 127a forward by thumb 57a.
Shown in Figure 24 and 30, boosting bar 67 is arranged in the rear of main switch 64 and right-hand, and the rear of rotary mode switch 65 and left.
Shown in Figure 24,26 and 30, arm 126 tegmentums 71 of boosting bar 67 hide, and operating stem part 127 is being held when boosting rod guidance hole 76 protrudes upward.
Shown in Figure 24 and 25, operating unit 18 is located at the rearward end 31a place of left handle 31, thereby speed change lever 62, main switch 64 and rotary mode switch 65 and engine speed change switch 66 and boosting bar 67 can be combined at operator's left-hand side.Therefore can prevent that operation from becoming complicated, thereby can improve the easiness of operation.
The bunch (not shown) that main switch 64, rotary mode switch 65, engine speed change switch 66 and operative clutch operation detection sensor 68 can be bundled together with gear cable 27 and clutch cable 122.Thereby can be by the bunch of gear cable 27 and clutch cable 122 protective switches.
Below will and the operation example of operative clutch bar 41 and travel rod 42 be described with reference to Figure 23 based on Figure 31 A to 31D.
Shown in Figure 31 A, the operator catches a left side to hold the left pole support portion 44 of pillar part 34 and operative clutch bar 41 with left hand 57, and holds three horizon bars 36,46,55 that stack with the right hand 58.
Under this state, the operator can only make the thumb 57a of left hand 57 extend in the operating space 56, and thumb 57a is hooked in hold part 127a to go up (thumb 57a is placed on holds on the part 127a), shown in Figure 31 B.
Shown in Figure 31 C, be hooked in the thumb 57a that holds on the part 127a and promote forward, thereby promote to hold part 127a forward.As a result, boosting bar 67 is swung along the clockwise direction among Figure 31 C (direction of arrow R11) around rest pin 125.Therefore pressing plate 131 separates along clockwise direction (direction of the arrow R12) swing of Figure 31 C and with push rod 66a.Shown in Figure 31 D, push rod 66a stretches out downwards, switches to " connection " state thereby engine speed changes switch 66.
As knowing as can be known from the above description that provides, in the 4th embodiment's back-walking type mowing machine 10, to the side of selecting from left and right side of holding part 33 (the less side from a hand to the switching of another hand of holding part 33 thereon), promptly the left side provides operating space 56, and the part 127a that holds of boosting bar 67 is arranged in the operating space 56.
Therefore the operator can hold part 127a and not make and hold the left hand 57 that holds pillar part 34 in a left side and move the rotating speed that temporarily increases engine 14 by only operating with thumb 57a.Thumb 57a is left hold part 127a to hold pressure on the part 127a, thereby boosting bar 67 can return initial position by the thrust of torsion spring 134 with release.
In addition, hold part 127a be arranged in a left side hold pillar part 34 near.The operator cosily (not troublesomely) his thumb 57a be placed on hold on the part 127a, hold a left side with left hand 57 simultaneously and hold pillar part 34.When 10 operations of back-walking type mowing machine, boosting bar 67 can be easily operated, and the target engine speed of engine 14 (seeing Figure 23) can be promptly changed temporarily according to working condition.
For example, when the load on the utensil 15 between " stillness mode " operational period increases temporarily, can promptly switch to " dynamic mode " by operation boosting bar 67 temporarily.When getting back to original state, load can return " stillness mode " rapidly then.
Engine speed also can increase simultaneously and not disturb or the speed of the operation of slowing down, and can expect and further increase work efficiency.
Shown in Figure 28 and 29, when promoting forward to hold part 127a, hold the scope that is pushed of part 127a by the moving range restriction of thumb 57a by the thumb 57a that holds the left hand 57 that holds pillar part 34 in a left side.
Yet pillar part 34 is held forward and be inclined upwardly in a left side.Boosting bar 67 also further extends back than holding part 33.In other words, holding part 127a holds pillar part 34 than a left side and stretches out more backward.
The operator cosily (not troublesomely) utilize the thumb 57a of operator's left hand 57 will hold part 127a push forward to a left side hold pillar part 34 near, wherein left hand 57 holds the left pole support portion 44 that pillar part 34 and operative clutch bar 41 are held in a left side.
The scope that part 127a is held in promotion is limited in the moving range of thumb 57a, therefore holds part 127a and can not move forward too far away.
Below the control flow of control unit shown in Figure 23 89 will be described based on Figure 32 and 33.From engine starting the time be carved into the sequence of operation and first embodiment shown in Figure 8 in the moment of control unit executive control program identical, and no longer description.
Figure 32 is the control flow chart (main program) according to the 4th embodiment's control unit 89, and shows the basic controlling flow process of carrying out step ST07 shown in Figure 9 " engine speed control program " for control unit 89.
The difference of the 4th embodiment's shown in Figure 32 control flow chart and first embodiment's shown in Figure 10 control flow chart is, has added step ST310.Basic identical among the others of the 4th embodiment's control flow chart and Figure 10.
In the 4th embodiment's ST11, the switching signal of read switch.Specifically, read the signal of rotary mode switch 65, engine speed change switch 66 and operative clutch operation detection sensor 68.
The 4th embodiment's ST310 carries out after ST13, ST15 and ST16, is the step of carrying out the program that is used for Iterim Change engine 14 rotating speeds therein.The subroutine that is used for specifically carrying out ST310 has been shown in Figure 33 described below.After carrying out ST310, handle advancing to ST18.
Figure 33 is the flow chart of the control (subroutine) carried out of the control unit 89 by the 4th embodiment, and shows the concrete control flow of the program of Iterim Change engine 14 rotating speeds shown in the ST310 that is used to carry out Figure 32.
ST301: whether operative clutch bar 41 is in " connection " position makes an appraisal, and in the result when being, handle advancing to ST302.For not the time, determine that the Spin Control pattern of engine 14 is " idle mode " in the result, and finish according to the control of the subroutine of Figure 33.As shown in figure 24, operator position that operative clutch bar 41 is swung forwards to is " connection " position.Determine the position of operative clutch bar 41 according to the testing signal of operative clutch operation detection sensor 68 (seeing Figure 23).
ST302: whether the Spin Control pattern to engine 14 is that " stillness mode " makes an appraisal, and when being, handles advancing to ST303 in the result.For not the time, determine that the Spin Control pattern is " dynamic mode " in the result, finish according to the control of the subroutine of Figure 33.In ST302, when rotary mode switch 65 is connected, be defined as being, and when rotary mode switch 65 disconnects, be defined as not.
ST303: because transformation to " stillness mode " has taken place, whether connect and make an appraisal, when being, determine to enter " dynamic mode " that processing advancing to ST304 temporarily in the result so engine speed is changed switch 66., finish for not the time in the result according to the control of the subroutine of Figure 33.Only engine speed change switch 66 is just connected when boosting bar 67 is swung forward.
ST304: after the target engine speed Nt of engine 14 is made as high target engine speed NH, finish according to the control of the subroutine of Figure 33.
Below will be based on Figure 34 and with reference to the operation of Figure 23 description by the described back-walking type mowing machine 10 of the control flow chart in Figure 32 and 33 (engine driven type work machine 10).
Figure 34 is a time diagram, express time on horizontal axis wherein, and Figure 34 shows the operation of each parts in the back-walking type mowing machine 10.
When operative clutch bar 41 was in " disconnection " position, the Spin Control pattern of engine 14 was " idle mode ", and changed the operation irrelevant (ST12 of Figure 32) of switch 66 with rotary mode switch 65 or engine speed.Therefore, the target engine speed Nt of engine 14 remains on low target engine speed NL (ST13 of Figure 32).
When rotary mode switch 65 was connected, in case operative clutch bar 41 places " connection " position at time t11, the Spin Control pattern of engine 14 just became " stillness mode " (ST12 of Figure 32 and ST14).Therefore, the target engine speed Nt of engine 14 becomes intermediate objective engine speed NM (ST15 of Figure 32).
When changing switch 66 when " disconnection " switches to " connection " at time t12 by boosting bar 67 being swung make engine speed forward subsequently, the Spin Control pattern of engine 14 becomes " dynamic mode " (ST303 of Figure 33).Therefore, the target engine speed Nt of engine 14 becomes high target engine speed NH (ST304 of Figure 33).In operation boosting bar 67, promptly from time t12 to time t13, " dynamic mode " continues.
Only when the Spin Control pattern that satisfies engine 14 is the condition of " stillness mode " operation boosting bar 67 during just occur to the change of " dynamic mode ".
At time t13, when the operation of boosting bar 67 stopped, the Spin Control pattern turned back to initial " stillness mode " (ST303 of Figure 33 and ST14 of Figure 32).Therefore, the target engine speed Nt of engine 14 becomes intermediate objective engine speed NM (ST15 of Figure 32).
When subsequently in 65 disconnections of time t14 place rotary mode switch, the Spin Control pattern of engine 14 becomes " dynamic mode " (ST14 of Figure 32 and ST302 of Figure 33).Therefore, the target engine speed Nt of engine 14 becomes high target engine speed NH (ST16 of Figure 32).Under " dynamic mode ", keep " dynamic mode ", and change the serviceability of switch 66 with engine speed, promptly the serviceability of boosting bar 67 is irrelevant.The target engine speed Nt of engine 14 also remains on high target engine speed NH.
When operative clutch bar 41 subsequently when time t15 places " disconnection " position, the Spin Control pattern of engine 14 becomes " idle mode " (ST12 of Figure 32 and ST301 of Figure 33).Therefore, the target engine speed Nt of engine 14 becomes low target engine speed NL (ST13 of Figure 32).
Description to the 4th embodiment is summarized as follows.
In the 4th embodiment, the opening and closing of closure 92 can be by control unit 89 and by electric control, thereby the interim increment of the target engine speed Nt that makes engine 14 changes, and and if only if back-walking type mowing machine 10 just in the running (for example only advance or operational period between) personnel operation that changes unit 60 according to the target engine speed makes actual engine rotational speed N r meet the target engine speed Nt of change.Therefore, the operator can only change unit 60 by the Action Target engine speed so that the interim increment of target engine speed Nt changes, thereby especially easily changes over any target engine speed Nt.Therefore, operate the solar term bar the operator needn't resemble in the prior art so that target engine speed Nt is finely tuned.
Like this, even when the load notable change owing to back-walking type mowing machine 10 makes load notable change on the engine 14, the operator also can easily adjust the target engine speed Nt of engine 14 according to the load on the engine 14.As a result, can improve the processing ease and the working efficiency of back-walking type mowing machine 10.Because the operator also can change the target engine speed Nt of engine 14 according to the working condition of back-walking type mowing machine 10 arbitrarily and provisionally, so can in the operation of mowing and various other types, continue to obtain good effect.
In load hour, also can change the target engine speed Nt (actual engine rotational speed N r) of unit 60, thereby reduce engine noises easily by the Action Target engine speed to reduce engine 14.As a result, can reduce the noise content that back-walking type mowing machine 10 produces, thereby improve working environment.By hour reduce the actual engine rotational speed N r of engine 14 in load, can reduce the fuel consumption of engine, also can reduce the amount of dust that back-walking type mowing machine 10 during operation produces.
In addition, the target engine speed Nt that changes the change order increment ground change of unit 60 according to the target engine speed in the 4th embodiment is set at two ranks that comprise intermediate objective engine speed NM and high target engine speed NH.The target engine speed changes operation generation action and the effect identical with the operation of target engine speed selected cell 65 of unit 60.
When carrying out operation in " stillness mode " or " dynamic mode " relatively long down time, target engine speed switching unit 65 preferably switches the Spin Control pattern to remain unchanged in due course.
When under " stillness mode ", carrying out operation, only when increasing temporarily, load switches to " dynamic mode " temporarily, and pattern is returned " stillness mode " rapidly and is continued operation.In this case, the target engine speed changes preferably switching in due course of unit 60.
Like this, but select target engine speed switching unit 65 and target engine speed change unit 60 to change the Spin Control pattern according to working condition.As a result, can improve the processing ease and the working efficiency of engine driven type work machine 10.
The modification of the program shown in Figure 33 of the rotating speed that is used for Iterim Change engine 14 is described based on Figure 35 below.
Figure 35 is the flow chart of the control of being undertaken by control unit 89 (subroutine) in the 4th embodiment's first modification, shows the modification of the subroutine of the rotating speed that is used for Iterim Change engine 14 in the step ST310 of Figure 32.
ST401: whether operative clutch bar 41 is in " connection " position makes an appraisal, and in the result when being, handle advancing to ST402.For not the time, determine that the Spin Control pattern of engine 14 is " idle mode " in the result, handle advancing to ST413.Engine speed Nu after operative clutch bar 41 will increase when " disconnection " position switches to " connection " position is reset to 0 (zero), (seeing ST414) as described below.
ST402: whether the Spin Control pattern to engine 14 is that " stillness mode " makes an appraisal, and when being, handles advancing to ST403 in the result., determine to carry out " dynamic mode " for not the time in the result, handle advancing to ST411.In ST402, when rotary mode switch 65 is connected, be defined as being, and when rotary mode switch 65 disconnects, be defined as not.Engine speed Nu after will increasing when " dynamic mode " switches to " stillness mode " is reset to 0 (zero), (seeing ST412) as described below.
ST403: because transformation to " stillness mode " has taken place, whether connect and make an appraisal, when being, determine to enter " dynamic mode " that processing advancing to ST404 temporarily in the result so engine speed is changed switch 66.For not the time, handle advancing to ST407 in the result.Only engine speed changes switch 66 connections when boosting bar 67 is swung forward.
ST404: by the timer that is built in the control unit 89 engine speed is changed the time T c that switch 66 is connected, promptly Tc counts the elapsed time.When beginning to count, elapsed time Tc, promptly initial value is zero.
ST405: to disappearance time T c whether than certain preset reference time T s long (Tc 〉=Ts) make an appraisal, when being, counter stops in the result, processing advances to ST406.For not the time, handle advancing to ST408 in the result.Fiducial time, Ts was as carry out interim dynamic mode definite benchmark of having operated boosting bar 67 when switching when operator intention.
ST406: because having taken place, interim dynamic mode switches, thus during operating boosting bar 67 temporarily, the operator calculates according to time T c (elapsed time Tc), to determine the engine speed Nu of already added engine 14, the engine speed Nu after promptly increasing.Multiply by engine speed Nu (Nu=Tc * Δ N) after elapsed time Tc calculates increase by increasing with engine speed than Δ N.It is to increase the default constant that equates with the rotating speed of time per unit engine 14 that engine speed increases than Δ N.
ST407: because in ST403, do not exist or no longer exist the interim dynamic mode of boosting bar 67 to switch, so the engine speed Nu after the increase of calculating in ST406 is stored in the storage that is built in the control unit 89.
ST408: the engine speed Nu after the increase that obtains from the interim switching to dynamic mode is added to the target engine speed Nt (Nt=NM+Nu) of the intermediate objective engine speed NM of stillness mode with computing engines 14.Here the engine speed Nu after increasing is the value that obtains in ST406 or ST407.
ST409: whether target engine speed Nt is surpassed high target engine speed NH, and (Nt＞NH) make an appraisal when being, determines that target engine speed Nt is too high in the result, and processing advancing to ST410.For not the time, determine that target engine speed Nt is suitable in the result, finish according to the control of the subroutine of Figure 35.
ST410: after excessive target engine speed Nt is updated to high target engine speed NH as the upper limit, finish according to the control of the subroutine of Figure 35.
ST411: because the Spin Control pattern of engine 14 is " dynamic mode ", so the target engine speed Nt of engine 14 is set at high target engine speed NH.
ST412: the engine speed Nu after increase is reset to after zero, finishes according to the control of the subroutine of Figure 35.
ST413: because the Spin Control pattern of engine 14 is " idle mode ", so the target engine speed Nt of engine 14 is set at low target engine speed NL.
ST414: the engine speed Nu after will increasing is reset to zero.
ST415: be reset to after zero at elapsed time Tc, finish according to the control of the subroutine of Figure 35 by timer counting.
Below will be based on Figure 36 with reference to the operation of Figure 23 description by the described back-walking type mowing machine 10 of control flow chart (engine driven type work machine 10) shown in Figure 32 and 35 of first modification that is used for the 4th embodiment.
Figure 36 is a time diagram, express time on horizontal axis wherein, and Figure 36 shows the operation of each parts of the back-walking type mowing machine 10 in the 4th embodiment's first modification.
When operative clutch bar 41 was in " disconnection " position, the Spin Control pattern of engine 14 was " idle mode ", and changed the operation irrelevant (ST12 of Figure 32 and the ST401 of Figure 35) of switch 66 with rotary mode switch 65 or engine speed.Therefore, the target engine speed Nt of engine 14 remains on low target engine speed NL (ST13 of Figure 32 and the ST413 of Figure 35).
When rotary mode switch 65 was connected, in case operative clutch bar 41 places " connection " position at time t21, the Spin Control pattern of engine 14 just became " stillness mode " (ST12 of Figure 32, ST14).Therefore, the target engine speed Nt of engine 14 becomes intermediate objective engine speed NM (ST15 of Figure 32).
When the switch of engine speed change subsequently 66 is connected, be that boosting bar 67 is when swinging forward, during the elapsed time Tc from time t22 to time t23, the engine speed Nu after the increase increases (ST403 to ST406 of Figure 35) according to elapsed time Tc gradually with constant increment rate.The target engine speed Nt of engine 14 also increases (ST408 of Figure 35) from middle target engine speed NM with constant increment rate gradually.
Like this, only when being the condition of " stillness mode ", the Spin Control pattern that satisfies engine 14 during the time T c of operation boosting bar 67, can increase the target engine speed Nt of engine 14.
At time t23, when the operation of boosting bar 67 stops, remaining on the engine speed Nu (ST407 of Figure 35) after the increase at time t23 place.Therefore, also kept the value (ST408 of Figure 35) of the target engine speed Nt of engine 14 at time t23 place.
When subsequently in 65 disconnections of time t24 rotary mode switch, the Spin Control pattern of engine 14 becomes " dynamic mode " (ST14 of Figure 32 and ST402 of Figure 35).Therefore, the target engine speed Nt of engine 14 becomes high target engine speed NH (ST16 of Figure 32 and the ST411 of Figure 35).Under this " dynamic mode " state, keep " dynamic mode ", and change the actuating of switch 66 with engine speed, promptly the serviceability of boosting bar 67 is irrelevant.
Under " dynamic mode " state, the engine speed Nu after the increase is reset to zero (ST412 of Figure 35).
When time t25 rotary mode switch 65 recloses, the Spin Control pattern of engine 14 becomes " stillness mode " (ST14 of Figure 32).Therefore, the target engine speed Nt of engine 14 becomes intermediate objective engine speed NM (ST15 of Figure 32).
When the switch of engine speed change subsequently 66 is connected, be that boosting bar 67 is when swinging forward, during the elapsed time Tc from time t26 to time t27, the engine speed Nu after the increase increases (ST403 to ST406 of Figure 35) according to elapsed time Tc gradually with constant increment rate.The target engine speed Nt of engine 14 also increases (ST408 of Figure 35) from middle target engine speed NM with constant increment rate gradually.
Yet (Nt＞NH), when the engine speed Nu after promptly increasing was too high, target engine speed Nt was as the upper limit (ST409 to ST410 of Figure 35) of high target engine speed NH when target engine speed Nt surpasses high target engine speed NH.
At time t27, when the operation of boosting bar 67 stops, remaining on the engine speed Nu (ST407 of Figure 35) after the increase at time t27 place.Therefore, also kept the value (ST408 of Figure 35) of the target engine speed Nt of engine 14 at time t27 place.
When operative clutch bar 41 subsequently when time t28 places " disconnection " position, the Spin Control pattern of engine 14 becomes " idle mode " (ST12 of Figure 32 and ST401 of Figure 35).Therefore, the target engine speed Nt of engine 14 becomes low target engine speed NL (ST413 of Figure 35).
Be at operative clutch bar 41 under the state of " disconnection " position, engine speed Nu after the increase and elapsed time Tc are reset to zero (ST414 to ST415 of Figure 35).
Except the effect of first embodiment shown in Fig. 1 to 11, also has following effect according to first modification of the 4th embodiment shown in Figure 35 and 36.
Specifically, the change of the target engine speed in first modification unit 60 constitutes only to send continuously by personnel operation the time and changes order.Control unit 89 constitutes according to sending the time T c that changes order increases target engine speed Nt.
In first modification, the target engine speed changes unit 60 and send the change order continuously during the time T c of continuous running target engine speed change unit 60, and control unit 89 increases target engine speed Nt according to sending the time T c (that is elapsed time Tc) that changes order.Therefore can use even higher precision set target engine speed Nt.As a result, can further improve the working efficiency of back-walking type mowing machine 10.
In the 4th embodiment and the 4th embodiment's first modification, control unit 89 can constitute when satisfying at least one condition from the group that the condition of carrying out the condition of operation by cutter 15 (utensil 15) and advanced by the unit 13 of advancing constitutes, and this control unit 89 determines to satisfy the condition that back-walking type mowing machine 10 is turning round.
The control unit 89 of the 4th embodiment and the 4th embodiment's first modification provides the ST301 of ST12, Figure 33 of Figure 32 and the ST401 of Figure 35, thereby constitute " determining to satisfy the condition that back-walking type mowing machine 10 is turning round when operative clutch bar 41 is in the condition of " connection " position (that is, cutter 15 activate) satisfying ".
The structure of back-walking type mowing machine 10A by adopting second modification shown in Figure 37 to Figure 38 C, the perhaps structure of the back-walking type mowing machine 10A of the 3rd modification shown in Figure 39 A to Figure 39 C among the 4th embodiment, control unit 89 can constitute determines whether back-walking type mowing machine 10A turns round.
Figure 37 is the exemplary system figure according to the back-walking type mowing machine 10A of the 4th embodiment's second modification.
The back-walking type mowing machine 10A of second modification has basic structure and the operation identical with the back-walking type mowing machine 10 shown in Figure 22 to 36.Use identical reference character to represent the same parts of back-walking type mowing machine 10A, and omit description these parts.In the back-walking type mowing machine 10A of second modification, operating unit 18 is provided with travel rod operation detection sensor 141.
Travel rod operation detection sensor 141 detects the operation (corresponding to so-called clutch) of speed change gear 25 by travel rod 142, thereby the output of engine 14 is passed to trailing wheel 13, and for example is made of microcomputer.When travel rod 42 was rocked to " connection " position forward, travel rod operation detection sensor 141 detected bonding operation and sends testing signal to control unit 89.
Figure 38 A is the control flow chart of the main program of the control unit 89 among the 4th embodiment's the back-walking type mowing machine 10A of second modification.Main program shown in Figure 32 is partly revised, and Figure 38 A only shows the modification part.
The distinguishing characteristics of the main program of second modification is to increase ST12A.In ST12, whether operative clutch bar 41 is in " disconnection " position and makes an appraisal, and in the result for not the time, determine that cutter 15 is activated, handle advancing to ST12A.
In ST12A, whether travel rod 42 is in " disconnection " position makes an appraisal, when being, handle advancing to ST13 in the result.For not the time, determine that trailing wheel 13 advancing in the result, handle advancing to ST14.As shown in figure 26, when removing, travel rod 42 position of travel rod 42 is in " disconnection " position at operator's hand.Determine the position of travel rod 42 according to the testing signal of travel rod operation detection sensor 141 (seeing Figure 37).
Figure 38 B is the control flow chart of the subroutine of the control unit 89 among the 4th embodiment's the back-walking type mowing machine 10A of second modification, and subroutine wherein shown in Figure 33 is partly revised.
The distinguishing characteristics of the subroutine of second modification is to increase ST301A.In ST301, whether operative clutch bar 41 is in " connection " position and makes an appraisal, and in the result when being, determine that cutter 15 is activated, handle advancing to ST301A.
In ST301A, whether travel rod 42 is in " connection " position makes an appraisal, when being, determine that trailing wheel 13 advancing in the result, handle advancing to ST302., finish for not the time in the result according to the control of the subroutine of Figure 38 B.
Figure 38 C is a control flow chart, and wherein the subroutine of the control unit 89 among the back-walking type mowing machine 10A of the 4th embodiment's second modification is partly revised.The subroutine of first modification shown in Figure 35 is partly revised, and Figure 38 C only shows the modification part.
The distinguishing characteristics of the subroutine of second modification is to increase ST401A.In ST401, whether operative clutch bar 41 is in " connection " position and makes an appraisal, and in the result when being, determine that cutter 15 is activated, handle advancing to ST401A.
In ST401A, whether travel rod 42 is in " connection " position makes an appraisal, when being, determine that trailing wheel 13 advancing in the result, handle advancing to ST402.For not the time, handle advancing to ST413 in the result.
Like this, control unit 89 in second modification of the 4th embodiment shown in Figure 38 A to 38C constitutes when cutter 15 and is turning round the condition and the trailing wheel 13 of (ST401 of the ST301 of the ST12 of Figure 38 A, Figure 38 B and Figure 38 C) condition of (ST401A of the ST301A of the ST12A of Figure 38 A, Figure 38 B and Figure 38 C) of advancing when all satisfying, and this control unit 89 determines to satisfy the condition that back-walking type mowing machine 10A is turning round.
To describe the control flow of the 3rd modification based on Figure 39 A to 39C below, wherein second modification is further revised.
Figure 39 A is the control flow chart of the main program of the control unit 89 among the 4th embodiment's the back-walking type mowing machine 10A of the 3rd modification.Main program shown in Figure 38 A is partly revised, and Figure 39 A only shows the modification part.
In the main program of the 3rd modification, in ST12, whether operative clutch bar 41 is in " disconnection " position and makes an appraisal, when being, handle advancing to ST12A in the result.For not the time, determine that cutter 15 is activated in the result, handle advancing to ST14.
In ST12A, whether travel rod 42 is in " disconnection " position makes an appraisal, when being, handle advancing to ST13 in the result.For not the time, determine that trailing wheel 13 (seeing Figure 37) advancing in the result, handle advancing to ST14.
Figure 39 B is the control flow chart of the subroutine of the control unit 89 among the 4th embodiment's the back-walking type mowing machine 10A of the 3rd modification, and wherein the subroutine shown in Figure 38 B is partly revised.
In the subroutine of the 3rd modification, in ST301, whether operative clutch bar 41 is in " connection " position and makes an appraisal, and in the result when being, determine that cutter 15 is activated, handle advancing to ST302.For not the time, handle advancing to ST301A in the result.
In ST301A, whether travel rod 42 is in " connection " position makes an appraisal, when being, determine that back-walking type mowing machine 10A (seeing Figure 37) advances in the result, handle advancing to ST302., finish for not the time in the result according to the control of the subroutine of Figure 39 B.
Figure 39 C is the control flow chart of the subroutine of the control unit 89 among the 4th embodiment's the back-walking type mowing machine 10A of the 3rd modification, and wherein the subroutine shown in Figure 38 C is partly revised.
In the subroutine of the 3rd modification, in ST401, whether operative clutch bar 41 is in " connection " position and makes an appraisal, and in the result when being, determine that cutter 15 is activated, handle advancing to ST402.For not the time, handle advancing to ST401A in the result.
In ST401A, whether travel rod 42 is in " connection " position makes an appraisal, when being, determine that trailing wheel 13 advancing in the result, handle advancing to ST402.For not the time, handle advancing to ST413 in the result.
Like this, control unit 89 in the 3rd modification of the 4th embodiment shown in Figure 39 A to 39C constitutes when cutter 15 and is turning round the condition and the trailing wheel 13 of (ST401 of the ST301 of the ST12 of Figure 39 A, Figure 39 B and Figure 39 C) condition of (ST401A of the ST301A of the ST12A of Figure 39 A, Figure 39 B and Figure 39 C) of advancing when all satisfying, and this control unit 89 determines to satisfy the condition that back-walking type mowing machine 10A is turning round.
Except the effect of first embodiment shown in Fig. 1 to 11 and the 4th embodiment's shown in Figure 22 to 34 effect, second shown in Figure 37 to 39C and the 3rd modification also have following effect.
Specifically, when cutter 15 (utensil 15) just in the running and when trailing wheel 13 (unit 13 of advancing) when advancing, the control unit 89 in the second and the 3rd modification determines that back-walking type mowing machine 10A turn round.Therefore, target engine speed Nt can be according to the variation of the work loads of cutter 15 itself, perhaps the variation of the load of advancing of trailing wheel 13 and carry out increment with higher precision and change.Therefore, can further improve the working efficiency of back-walking type mowing machine 10A.
To utilize the example of back-walking type mowing machine below, describe the 5th embodiment based on Figure 40 to 49F as engine driven type work machine.Same reference numerals is used for being illustrated in the 5th embodiment structure and the action identical with first embodiment shown in Fig. 1 to 11, and structure and the action identical with the 4th embodiment shown in Figure 22 to 34, and omits the description to it.
Shown in Figure 40 and 41, the 5th embodiment's back-walking type mowing machine 10 has the essentially identical basic structure with first embodiment.The distinguishing characteristics of the 5th embodiment's back-walking type mowing machine 10 is, has revised the structure of target engine speed switching unit 65 (target engine speed selected cell 65).
As shown in figure 41, the 5th embodiment's target engine speed selected cell 65 constitutes by switching manipulation bar 77 with by the rotary mode switch 78 (diverter switch 78) of switching manipulation bar 77 operation.In other words, the 5th embodiment's target engine speed selected cell 65 constituting by switching manipulation bar 77 and the rotary mode switch 78 that replaces the seesaw switch among first embodiment.
Target engine speed selected cell 65 is target engine speed switching units, is used to specify the single engine speed of the target arbitrarily value of selecting from the target engine speed with a plurality of default increment sizes of engine 14.More particularly, the control mode of switch engine 14 between the target engine speed selected cell 65 " stillness mode " and " dynamic mode " described hereinafter.
The 5th embodiment's control unit 89 receives the signal of main switch 64, target engine speed selected cell 65, operative clutch operation detection sensor 68, solar term angle transducer 85 and engine turn-sensitive device 86, and Control Engine 14.Like this, the control details of being undertaken by the 5th embodiment's control unit 89 is identical with the control details that the control unit 89 by first embodiment carries out, and therefore will not be described.
The structure of the 5th embodiment's speed change lever 62 and target engine speed selected cell 65 hereinafter will be described in further detail.
The 5th embodiment's speed change lever 62 at first will be described.The basic structure of the basic structure of the 5th embodiment's speed change lever 62 and the speed change lever 62 of first embodiment shown in Fig. 1 to 7 is roughly the same.The 5th embodiment's speed change lever 62 has following distinguishing characteristics.
Shown in Figure 43 and 44, speed change lever 62 is provided with to engage and receives projection 107 (engaging acceptance division 107).Specifically, when looking, plate-like portion 94 forms the forked of downward extension in the place ahead (direction of the arrow Lk Figure 43) from plate-like portion 94.Joint reception projection 107 extends back from the rear and low part 94b of one of two forked left and right side.Engage reception projection 107 and have engaging surface 107a on the surface thereon.Engaging surface 107a is with arc-shaped recess.
The swing position of speed change lever 62 comprises low-speed position P1 and high speed position P2, and operating stem portion 95 recedes farthest in low-speed position P1, and shown in the dotted line among Figure 46, operating stem portion 95 turns forward farthest in high speed position P2, shown in solid line.In addition, the neutral position P3 between low-speed position P1 and high speed position P2 is middling speed position P3.Speed change lever 62 can freely swing the space from low-speed position P1 to high speed position P2.
Low-speed position P1 is such position, wherein settles speed change gear 25 for the rotating speed with trailing wheel shown in Figure 40 13 is made as the minimum speed of regulation.High speed position P2 is such position, wherein settles speed change gear 25 for the rotating speed with trailing wheel 13 is made as the top speed of regulation.
Below the 5th embodiment's target engine speed selected cell 65 will be described based on Figure 42 to 48.
The 5th embodiment's target engine speed selected cell 65, promptly the basic structure of the basic structure of switching manipulation bar 77 and rotary mode switch 78 and the 4th embodiment's shown in Figure 27 and 28 engine speed change switch 66 and boosting bar 67 is similar.
Shown in Figure 42,44 and 45, switching manipulation bar 77 be the hand 57 in operation automatically return to initial position when unclamping this bar return part automatically.Rotary mode switch 78 (seeing Figure 45) switches according to the operation of switching manipulation bar 77.For example, rotary mode switch 78 is connected when 77 operations of switching manipulation bar, and disconnects when switching manipulation bar 77 turns back to initial position.
Shown in Figure 45 and 46, switching manipulation bar 77 holds pillar part 34 and operating space 56 relevant modes according to following and a left side and locatees.
Because switching manipulation bar 77 is set, so the effect that obtains concerns that with the position that pillar part 34 and operating space 56 are held in a boosting bar in the 4th embodiment shown in Figure 27 to 29 67 and a left side effect that obtains is identical with this class position relation.
More particularly, the arm 152 of switching manipulation bar 77 has a pair of left and right sides vertical panel 154,155, also has the horizontal panel 156 that extends between the upper end of left and right sides vertical panel 154,155, shown in Figure 45 and 46.From the front side (direction of arrow Lk Figure 45) of back-walking type mowing machine 10 when watching arm 152, the global shape of arm 152 is roughly down " U " shape.Hereinafter left vertical panel 154 will be called as arm plate 154, and right vertical panel 155 will be called as actuating arm 155, and horizontal panel 156 will be called as bar assembly department 156.
The middle body of arm plate 154 is installed on the rest pin 151, make arm plate 154 to swing forward and backward, and arm plate 154 has pressing plate 157 with the elongation end that extends downwards at it forward from middle body.Pressing plate 157 is towards the folding horizontal component of speed change lever scaffold 61 from the end of arm plate 154.
Shown in Figure 43 and 44, left handle 31 is provided with supporting arm 161.Supporting arm 161 is positioned to than speed change lever arm 63 more forward.Extension spring 162 is located between supporting arm 161 and the spring hook pin 158.Extension spring 162 is to be used to make switching manipulation bar 77 to automatically return to the Returnning spring of " disconnection " position.When switching manipulation bar 77 was in " disconnection " position, operating stem portion 153 was in " disconnection " position Q1 (seeing Figure 44).
When operating stem portion 153 is in as shown in figure 46 " disconnection " position Q1, be called " shutdown tension lines L1 " along the line L1 of extension spring 162 tension directions.Shutdown tension lines L1 more down is offset than the center 151a of rest pin 151.
As mentioned above, rotary mode switch 78 is promoted in the counterclockwise direction by extension spring 162.Therefore pressing plate 157 remains on the state that push rod 78a is pushed into.
In the operating unit 18 shown in Figure 42,44 and 48, main switch 64 is arranged in left and the place ahead of switching manipulation bar 77, and speed change lever 62 is arranged in the place ahead of switching manipulation bar 77, and the right front of main switch 64.
As shown in figure 46, when operating stem portion 153 is in " disconnection " position Q1, and speed change lever 62 is when being in high speed position P2, and joining pin 159 is arranged near the position HI that engages the engaging surface 107a that receives projection 107.Joining pin 159 is as follows with the relation that engages between the reception projection 107.
When operating stem portion 153 is in " disconnection " position Q1 shown in Figure 46, engage reception projection 107 and do not contact with joining pin 159, and irrelevant with the swing position of speed change lever 62.
More particularly, when the operating stem portion 95 of speed change lever 62 is in high speed position P2 under this relation, as shown in figure 46, operating stem portion 153 is along clockwise direction (direction of the arrow R21) swing of figure, thereby joining pin 159 promotes to engage and receives projection 107, makes speed change lever 62 swing to middling speed position P3.
Joining pin 159 is positioned at and engages the relevant higher relatively position HI of engaging surface 107a that receives projection 107.Under this state,, engage the engaging surface 107a that receives projection 107 and also do not contact with joining pin 159 even when speed change lever 62 is swung forward and backward between low-speed position P1 and high speed position P2.
Then operating stem portion 153 from " disconnection " position Q1 to (direction of the arrow R21) swing along clockwise direction of " connection " position, thereby joining pin 159 descends along the direction of arrow R22.In this case, when speed change lever 62 for example was in high speed position P2, joining pin 159 contact engaging surface 107a and being pushed into down engaged on the reception projection 107.Therefore speed change lever 62 is swung towards middling speed position P3 backward from high speed position P2.The position that speed change lever 62 returns is not limited to middling speed position P3, but can be made as any position.
Receive the structure formation coupling mechanism 163 that projection 107 forms by combined engagement pin 159 and joint.Because coupling mechanism 163 is provided with like this, so switch to when high-level with the target engine speed with engine 14 (see figure 2)s when switching manipulation bar 77 swing, speed change lever 62 can reduce direction along speed and engage.Speed change lever 62 can be connected to the operation of switching manipulation bar 77 by coupling mechanism 163, and is therefore simple in structure, and coupling mechanism 163 receives projection 107 by joining pin 159 and joint and constitutes.
Shown in Figure 42 and 47, the part 153a that holds of operating stem portion 153 is arranged in the operating space 56.In other words, operating stem portion 153 is arranged in such position, can come operating operation bar portion 153 by the left hand 57 that pillar part 34 is held on a left side of catching holding part 33 in this position.
Therefore, the operator for example 57 holds a left side when holding pillar part 34 leftward, can move to and thumb 57a is hooked in hold on the part 153a from holding part 153a back by making thumb 57a.Under this state, can promote to hold part 153a forward by thumb 57a.Hold part 153a and be pushed forward, thereby rotary mode switch 78 (seeing Figure 46) switches to " connection " state.Thereby the Spin Control pattern of engine 14 switches to " dynamic mode " from " stillness mode ", thereby selects " dynamic mode ".
What be pushed forward holds part 153a and can return initial position by following operation.
The operator for example holding with left hand 57 when a left side holds pillar part 34, makes forefinger, middle finger, the third finger and little finger of toe 57b (hereinafter referred to as " other points 57b ") move to operating space 56 from the place ahead of holding part 33.Thereby other finger 57b can be hooked in and hold on the part 153a.
Apply backward pressure by other finger 57b to holding part 153a, return backward thereby hold part 153a.Hold part 153a and return backward, thereby rotary mode switch 78 (seeing Figure 46) switches to " disconnection " state.Like this, the Spin Control pattern of engine 14 switches to " stillness mode " from " dynamic mode ", thereby selects " stillness mode ".
Specifically, operating stem portion 153 holds part 153a and can be arranged on the left-hand side, on this left-hand side almost not between operational period the handle from a hand to another hand switch, and can only utilize other finger 57b and need not reduce engine speed by mobile hand.
As tangible from the above description, in the 5th embodiment's back-walking type mowing machine 10, the operator can only utilize thumb 57a to promote to hold part 153a forward to increase the rotating speed of engine 14, is holding the left hand 57 that holds pillar part 34 in a left side and need not move.Therefore the operator cosily (not troublesomely) utilize thumb 57a to promote to hold part 153a forward.
Then, the operator catches a left side to hold the left pole support portion 44 of pillar part 34 and operative clutch bar 41 with left hand 57 when, can promote to hold part 153a backward by other finger 57b that only utilizes left hand 57 and cosily (not troublesomely) make and hold part 153a and return backward.
The operation example of operative clutch bar 41, travel rod 42, target engine speed selected cell 65 and coupling mechanism 66 will be described below.
At first will be described in the example that under the state that cutter 15 stops back-walking type mowing machine 10 is advanced with reference to Figure 41 based on Figure 44 and 49.
Figure 44 represents that operative clutch bar 41 and travel rod 42 all are in the state of " disconnection " position.Because operative clutch bar 41 is in " disconnection " position, so clutch 21 remains on " disconnection " state, operative clutch operation detection sensor 68 is in " disconnection " state equally.Because travel rod 42 is in " disconnection " state, so speed change gear 25 stops the output of engine 14 to be delivered to trailing wheel 13.
After engine 14 started, operative clutch bar 41 and travel rod 42 were swung forward.As a result, operative clutch bar 41 and travel rod 42 are superimposed upon on the holding part 33, shown in Figure 49 A.This superposed positions is " connection " position.
Operative clutch bar 41 moves to " connection " position, thereby operative clutch operation detection sensor 68 places " connection " state.Button 113 is not pressed, so clutch 21 remains on " disconnection " state.Travel rod 42 places " connection " position, thereby speed change gear 25 is passed to trailing wheel 13 with the output of engine 14.As a result, back-walking type mowing machine 10 is advanced forward.
To be described in the example that makes cutter 15 rotations when back-walking type mowing machine 10 is advanced based on Figure 42 and 49B to 49F and with reference to Figure 41 below.
Shown in Figure 49 B, operative clutch bar 41 and travel rod 42 are in " disconnection " position.Therefore clutch 21 and operative clutch operation detection sensor 68 are in " disconnection " state.Speed change gear 25 stops the output of engine 14 to be delivered to trailing wheel 13.Speed change lever 62 also is in low-speed position P1 backward.The operating stem portion 153 of switching manipulation bar 77 is in " disconnection " position Q1.Rotary mode switch 78 is in " disconnection " state that promotes push rod 78a by switching manipulation bar 77.Figure 49 B represents the state that button 113 is pressed.
Shutdown tension lines L1 in the extension spring 162 more down is offset than the center 151a of rest pin 151.Therefore extension spring 162 centers on rest pin 151 pushing switch operating stem 77 in the counterclockwise direction.As a result, switching manipulation bar 77 stable " disconnection " positions that remain on.
Start engine 14 then.
Shown in Figure 49 B and 49C, operative clutch bar 41 is swung forward when pressing the button 113, thereby clutch 21 places " connection " state.Therefore cutter 15 rotations.By making operative clutch bar 41 move to " connection " position, make operative clutch operation detection sensor 68 place " connection " state from " disconnection " position.
Shown in Figure 49 C, after operative clutch bar 41 placed " connection " position, even hand leaves button 113, locking plate 115a also remained locked in together with attachment pegs 118.
In addition, travel rod 42 is swung forward, thereby speed change gear 25 will be passed to trailing wheel 13 from the output of engine 14.Therefore, back-walking type mowing machine 10 is advanced forward.Because speed change lever 62 is in low-speed position P1, so back-walking type mowing machine 10 low speed are advanced.
As shown in figure 42, the operator can utilize cutter 15 to carry out cutting operation catching a left side to hold the left pole support portion 44 of pillar part 34 and operative clutch 41 with left hand 57 when, and with the right hand 58 three horizon bars 36,46,55 are grabbed together each other with superposeing, thereby back-walking type mowing machine 10 is advanced forward.
Shown in Figure 49 D, with the right hand 58 speed change lever 62 is rocked to high speed position P2 then.Therefore, make back-walking type mowing machine 10 high-speed travel.
Control mode with engine 14 switches to " dynamic mode " from " stillness mode " subsequently, comprises following operation.
The operator at first moves to his finger 57a the operating space 56 from the back of holding part 33 when catching a left side to hold pillar part 34 with left hand 57, holds on the part 153a thereby his finger 57a is hung over (placing), shown in Figure 49 D.
Then the operator with thumb 57a forward (along the direction of arrow 21) promote to hold part 153a.As a result, switching manipulation bar 77 is along clockwise direction (direction of the arrow R21) swing of figure.In other words, operating stem portion 153 is displaced to " connection " position Q2.Therefore pressing plate 157 along the clockwise direction (direction of arrow R22) of figure thus swing separates with push rod 78a.Push rod 66a stretches out downwards, thereby rotary mode switch 78 switches to " connection " state.By the connection of rotary mode switch 78, make the Spin Control mode switching of engine 14 become " dynamic mode ".
Figure 49 F represents that operating stem portion 153 is displaced to the state of " connection " position Q2.
The spring hook pin 158 of switching manipulation bar 77 is with the swing upward displacement of switching manipulation bar 77.Shown in Figure 49 F, move in operating stem portion 153 under the state of " connection " position Q2, spring hook pin 158 is higher than the center 151a of rest pin 151.When 158 displacements of spring hook pin, extension spring 162 also moves up with the interface of spring hook pin 158.
Like this, when operating stem portion 153 is in " connection " position Q2, be called as " start tension lines L2 " along the line L2 of extension spring 162 tension directions.Start tension lines L2 more up is offset than the center 151a of rest pin 151.Extension spring 162 is indexed to the start tension lines L2 shown in Figure 49 F from the center 151a that the shutdown tension lines L1 shown in Figure 49 B crosses rest pin 151.The tension lines displacement that center 151a is crossed in extension spring 162 like this is called " fulcrum crosses (fulcrum crossing) ".
Start tension lines L2 in the extension spring 162 more up is offset than the center 151a of rest pin 151 like this.Therefore extension spring 162 centers on rest pin 151 pushing switch operating stem 77 along clockwise direction.As a result, switching manipulation bar 77 stably remains on " connection " position.
During cutting operation, make the control mode of engine 14 (seeing Figure 41) return " stillness mode " subsequently, comprise following operation from " dynamic mode ".
The operator utilizes other finger 57b of left hand 57 to retract when catching a left side to hold pillar part 34 with left hand 57 and holds part 153a, shown in Figure 49 F.In other words, utilize other finger 57b to apply backward thrust to holding part 153a, thus make hold part 153a in the counterclockwise direction (direction of arrow 24) return.As a result, switching manipulation bar 77 returns initial " disconnection " position, shown in Figure 49 D.Because rotary mode switch 78 switches to " disconnection " state, the control mode of engine 14 turns back to " stillness mode " from " dynamic mode ".Speed change lever 62 is maintained at the middling speed position P3 shown in Figure 49 F.
As knowing as can be known from the above description, can be according to working condition Action Target engine speed selected cell 65 to select the target engine speed Nt of engine 14.Therefore can improve the working efficiency of back-walking type mowing machine 10.
In addition, because be provided with coupling mechanism 66, so when using target engine speed selected cell 65 select target engine speed Nt, can adjust the shift position of speed change lever 62 automatically.As a result, can adjust the gait of march of back-walking type mowing machine 10 automatically.By target engine speed selected cell 65 select target engine speed Nt the time, can save the time of manually-operable speed change lever 62, therefore can further improve the working efficiency of back-walking type mowing machine 10.
In the present invention, engine driven type work machine is not limited to back-walking type mowing machine 10,10A or walk type and ploughs machine 200, but can be applicable to be driven and be provided with by engine 14 various types of working machines of utensil.
In first embodiment, use seesaw switch as rotary mode switch 65, but this structure is unrestricted, but also can uses push-button switch or other switch.
Engine driven type work machine of the present invention is applicable to the working machine that the load on the utensil wherein can notable change between operational period, promptly, drive and be provided with the back-walking type mowing machine of cutter 15 by engine 14, perhaps drive and be provided with the walk type of ploughing plate 205,206 and plough machine by engine 14.
Claims (20)
1. an engine driven type work machine (10,10A, 200), this engine driven type work machine is used for by engine (14) driving implement (15,205,206), and this engine driven type work machine comprises:
Target engine speed selected cell (65), this target engine speed selected cell select and specify target engine speed (NM or NH) arbitrarily from a plurality of target engine speeds (Nt) of setting with hierarchical approaches; And
Control unit (89), this control unit is used for electric control is carried out in the opening and closing of the closure of described engine (14) (92), makes the actual engine rotating speed (Nr) of described engine (14) meet the target engine speed (NM or NH) by described target engine speed selected cell (65) appointment.
2. working machine according to claim 1 is characterized in that, described a plurality of target engine speeds (Nt) comprise two target engine speeds (Nt), and these two target engine speeds comprise:
Intermediate objective engine speed (NM) is stated engine (14) in this intermediate objective engine speed place and can be produced peak torque (Tmax) substantially; And
High target engine speed (NH), this high target engine speed (NH) is higher than described intermediate objective engine speed (NM), states engine (14) in this high target engine speed place and can produce maximum output (Pmax) substantially.
3. working machine according to claim 1 is characterized in that, this working machine also comprises:
Clutch (21,202), this clutch are used for the output that passes to described utensil (15,205,206) from described engine (14) is cut off and engaged;
Operative clutch operating unit (41,231), this operative clutch operating unit is used to operate described clutch (21,202); And
Operative clutch operation detection sensor (68), this operative clutch operation detection sensor are used for detection and by described operative clutch operating unit (41,231) described clutch (21,202) are placed engagement positio.
4. working machine according to claim 3, it is characterized in that, only work as described operative clutch operation detection sensor (68) and detect described clutch (21, when 202) being placed in engagement positio (ST12), described control unit (89) is just carried out control based on the target engine speed (NM or NH) of described appointment.
5. working machine according to claim 2 is characterized in that, described control unit (89) increases the target engine speed (NM or NH) of described appointment with hierarchical approaches, and the increase angle (Thr) of the described closure of result (92) increases.
6. working machine according to claim 5, it is characterized in that, described control unit (89) carries out classification and reduces, make the target engine speed (NM or NH) of described appointment reduce specified value at every turn, the result is at described solar term angle (Thr) when reducing, described solar term angle (Thr) decrease in accordance with regulations reduces, and the described regulation at described solar term angle (Thr) reduce value and described target engine speed (NM or NH) all is set at the smaller step size value by it with the regulation increment that hierarchical approaches reduces.
7. working machine according to claim 5, it is characterized in that, described control unit (89) carries out classification to be increased, make the target engine speed (NM or NH) of described appointment increase specified value at every turn, when the result increases at described solar term angle (Thr), described solar term angle (Thr) increasing amount in accordance with regulations increases, and the value added of the described regulation at described solar term angle (Thr) and described target engine speed (NM or NH) all are set at bigger increment size by it with regulation increment that hierarchical approaches increases.
8. working machine according to claim 5, it is characterized in that, described control unit (89) carries out the classification increase according to increasing characteristic curve, make the target engine speed (NM or NH) of described appointment increase specified value at every turn, when the result increased at described solar term angle (Thr), described solar term angle (Thr) increasing amount in accordance with regulations increased; And described control unit (89) carries out classification and reduces according to reducing characteristic curve, make the target engine speed (NM or NH) of described appointment reduce specified value at every turn, the result is at described solar term angle (Thr) when reducing, described stroke decrease in accordance with regulations reduces, and described increase characteristic curve and the described characteristic curve that reduces all lag behind.
9. working machine according to claim 1, it is characterized in that, this working machine also comprises the target engine speed change operating unit (60) that is used for sending based on personnel operation the Iterim Change order, wherein only ought satisfy the condition (ST301 that described engine driven type work machine (10) is turning round, ST301A, ST401, ST401A) time, described control unit (89) just according to described change order with target engine speed (NM) Iterim Change of described appointment be another target engine speed (NH, NM+Nu).
10. engine driven type work machine according to claim 9 is characterized in that, this working machine also comprises:
The unit (13) of advancing, this unit of advancing can self-propelled, wherein
When from carrying out the condition (ST301 of operation by utensil (15), ST401) and the condition (ST301A that advancing of the described unit of advancing (13), when ST401A) satisfying at least one condition in the group of Gou Chenging, described control unit (89) determines to satisfy the condition (ST301 that described engine driven type work machine (10) is turning round, ST301A, ST401, ST401A).
11. working machine according to claim 9, it is characterized in that, the target engine speed (NM) of described appointment is the intermediate objective engine speed (NM) that described engine (14) can produce peak torque (Tmax) substantially, and another target engine speed (NH) is a high target engine speed (NH), this high target engine speed (NH) is higher than described intermediate objective engine speed (NM), states engine (14) in this high target engine speed place and can produce maximum output (Pmax) substantially.
12. working machine according to claim 9, it is characterized in that, only during the time (tc) that personnel operation continues, described target engine speed changes operating unit (60) and just sends described change order continuously, and described control unit (89) is according to the target engine speed value (NM) of the described appointment of time (tc) increase of sending described change order, and the value after will increasing (NM+Nu) is as described another target engine speed (NM+Nu).
13. working machine according to claim 1 is characterized in that, this working machine also comprises:
Body (11), this body have the described unit of advancing (13), and described engine (14) is installed on this body;
Left and right sides handle (31,32), described left and right sides handle extends back from described body (11); And
Holding part (33), this holding part extends between the rear end of described left and right sides handle (31,32), wherein
Described holding part (33) comprises from the rear end of described left and right sides handle (31,32) and holds pillar part (34,35) about upwardly extending; And grip bar (36), this grip bar is held about described between the upper end of pillar part (34,35) and is extended, and described target engine speed selected cell (65) be located at the handle of from described left and right sides handle (31,32), selecting rearward end (31a, 32a).
14. working machine according to claim 13, it is characterized in that, this working machine comprises that also the target engine speed of the target engine speed (NM) that is used for the described appointment of Iterim Change changes operating unit (60), wherein said target engine speed changes operating unit (60) to have and is used for manually operated operation piece (67), described operation piece (67) is located at the position near described target engine speed selected cell (65), allow to operate described operation piece (67) in this position by the hand that holds the handle of from described left and right sides handle (31,32), selecting.
15. working machine according to claim 14 is characterized in that, this working machine also comprises:
Bar (41 or 42), this bar are used for the element of operation from the selection of described utensil (15) and the described unit of advancing (13), and this bar is positioned to the rear surface almost parallel with described holding part (33);
Left and right sides pole support portion (44,45 or 52,54), described left and right sides pole support portion are roughly parallel to respectively and hold pillar part (34,35) about described; And
Horizon bar (46,55), this horizon bar extends between the upper end of described left and right sides pole support portion (44,45 or 52,54), and is roughly parallel to described grip bar (36), wherein
Described left and right sides pole support portion (44,45 or 52,54) interval between (D2) is arranged to than holding pillar part (34 about described, 35) (D1) is little for the interval between, thereby provide operating space (56) described the holding between pillar part (34) and the described pole support portion (52) on one of left side and right side, described operation piece (67) is arranged in the described operating space (56).
16. working machine according to claim 15 is characterized in that, described operation piece (67) comprises the operating stem (67) that extends back more than described holding part (33).
17. working machine according to claim 1 is characterized in that, this working machine also comprises:
Body (11), this body have the described unit of advancing (13), and described engine (14) is installed on this body;
Handle (31), this handle extends back from described body (11);
Speed change lever (62), this speed change lever are located at described handle (31) and locate, and are used to adjust the gait of march of the described unit of advancing (13); And
Coupling mechanism (163), this coupling mechanism are used for the operation of described speed change lever (62) with described target engine speed selected cell (65) linked.
18. working machine according to claim 17, it is characterized in that, when described target engine speed selected cell (65) when slower-velocity target engine speed (NM) moves to high-speed target engine speed (NH) described a plurality of target engine speeds (Nt), described coupling mechanism (163) reduces side (P3) with described speed change lever (62) speed of switching to.
19. working machine according to claim 17, it is characterized in that, described target engine speed selected cell (65) comprises and is located at the switch lever (77) that described handle (31) is located, and can be by the switch (78) of described switch lever (77) operation, described coupling mechanism (163) comprises and is located at the joining portion (159) that described switch lever (77) is located, and be located at the joint acceptance division (107) that described speed change lever (162) is located, when described switch lever (77) moves, described joining portion (159) engages with the described acceptance division (107) that engages, thereby described speed change lever (62) is moved with described switch lever (77).
20. working machine according to claim 19 is characterized in that, described switch lever (77) comprises and holds part (153a), this hold part (153a) be arranged in described handle (31) holding part (33) near.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006017292A JP2007198240A (en) | 2006-01-26 | 2006-01-26 | Engine-driven work machine |
| JP2006017434 | 2006-01-26 | ||
| JP2006017389 | 2006-01-26 | ||
| JP2006017612 | 2006-01-26 | ||
| JP2006017498 | 2006-01-26 | ||
| JP2006017292 | 2006-01-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101008357A true CN101008357A (en) | 2007-08-01 |
| CN100591903C CN100591903C (en) | 2010-02-24 |
Family
ID=38453088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710008239A Expired - Fee Related CN100591903C (en) | 2006-01-26 | 2007-01-26 | Engine driven type work machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007198240A (en) |
| CN (1) | CN100591903C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686100A (en) * | 2010-01-13 | 2012-09-19 | 株式会社Ihi | Lawn mowing vehicle |
| CN104727964A (en) * | 2013-12-21 | 2015-06-24 | 安德烈·斯蒂尔股份两合公司 | Method for operating a handheld work apparatus having a combustion engine |
| CN106508248A (en) * | 2016-12-15 | 2017-03-22 | 苏州金莱克精密机械有限公司 | Gardening tool with height-adjustable push rod |
| CN110651584A (en) * | 2018-06-29 | 2020-01-07 | 创科（澳门离岸商业服务）有限公司 | Hand-held electric gardening device |
| CN113428166A (en) * | 2021-07-31 | 2021-09-24 | 重庆长安汽车股份有限公司 | Vehicle driving mode control method and system and vehicle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5304199B2 (en) * | 2008-11-25 | 2013-10-02 | 日立工機株式会社 | Engine working machine |
| WO2020027708A1 (en) * | 2018-08-02 | 2020-02-06 | Husqvarna Ab | Two-stroke engine control |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6172840A (en) * | 1984-09-19 | 1986-04-14 | Yanmar Diesel Engine Co Ltd | Control device of internal-combustion engine |
| US4860607A (en) * | 1986-06-20 | 1989-08-29 | Toyota Jidosha Kabushiki Kaisha | Automatic transmission for automotive vehicle |
| JPH02216330A (en) * | 1989-02-15 | 1990-08-29 | Yamaha Motor Co Ltd | Moving working machine |
| JPH04255535A (en) * | 1991-02-04 | 1992-09-10 | Walbro Far East Inc | Device for controlling throttle of internal combustion engine for portable work machine |
| JPH05147460A (en) * | 1991-11-27 | 1993-06-15 | Kubota Corp | Engine opeating device for lawn mower |
| JP2003328824A (en) * | 2002-05-15 | 2003-11-19 | Toyota Industries Corp | Electronic governor control device |
| JP4041446B2 (en) * | 2003-09-25 | 2008-01-30 | 本田技研工業株式会社 | Lawn mower engine speed control device |
| JP2005178631A (en) * | 2003-12-19 | 2005-07-07 | Yanmar Co Ltd | Working vehicle |
-
2006
- 2006-01-26 JP JP2006017292A patent/JP2007198240A/en active Pending
-
2007
- 2007-01-26 CN CN200710008239A patent/CN100591903C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686100A (en) * | 2010-01-13 | 2012-09-19 | 株式会社Ihi | Lawn mowing vehicle |
| US8839598B2 (en) | 2010-01-13 | 2014-09-23 | Ihi Corporation | Lawn mowing vehicle with a control unit for elevating mechanisms |
| US9084391B2 (en) | 2010-01-13 | 2015-07-21 | Ihi Corporation | Lawn mowing vehicle with a control unit for elevating mechanisms and for rotating a blade depending on grass condition |
| CN102686100B (en) * | 2010-01-13 | 2016-03-30 | 株式会社Ihi | Turf-mown vehicle |
| CN104727964A (en) * | 2013-12-21 | 2015-06-24 | 安德烈·斯蒂尔股份两合公司 | Method for operating a handheld work apparatus having a combustion engine |
| CN104727964B (en) * | 2013-12-21 | 2019-06-14 | 安德烈·斯蒂尔股份两合公司 | For running the method for having the hand-held power tool of internal combustion engine |
| CN106508248A (en) * | 2016-12-15 | 2017-03-22 | 苏州金莱克精密机械有限公司 | Gardening tool with height-adjustable push rod |
| CN106508248B (en) * | 2016-12-15 | 2024-01-30 | 苏州金莱克精密机械有限公司 | Garden tool with height-adjustable push rod |
| CN110651584A (en) * | 2018-06-29 | 2020-01-07 | 创科（澳门离岸商业服务）有限公司 | Hand-held electric gardening device |
| CN110651584B (en) * | 2018-06-29 | 2022-11-29 | 创科（澳门离岸商业服务）有限公司 | Hand-held electric gardening device |
| CN113428166A (en) * | 2021-07-31 | 2021-09-24 | 重庆长安汽车股份有限公司 | Vehicle driving mode control method and system and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007198240A (en) | 2007-08-09 |
| CN100591903C (en) | 2010-02-24 |
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