JP2006097547A - Engine control structure of agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve fuel economy and reduce noise in an agricultural machine. <P>SOLUTION: This engine control structure of the agricultural machine is provided with a detection means detecting that a gear change operating tool 42 for running is in a specific position ES bringing about a running stop state and an engine automatic stop means for stopping an engine 12 based on the detection. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an engine control device for agricultural machines such as rice transplanters and combines.

In general, an engine mounted on an agricultural machine is started by a cell motor or recoil starter, stopped by an operation of a key switch to an off position, and a speed control mechanism of the engine is controlled by a hand accelerator lever that can be held at an arbitrary operation position. It is designed to be adjusted arbitrarily. Also, by linking the speed change operation and the engine speed control mechanism, when the travel is stopped to the speed change operation to the neutral position, the speed control mechanism is decelerated to the idling rotation speed in conjunction with this and the travel is stopped. There has also been proposed an apparatus configured to improve fuel consumption and reduce noise (see, for example, Patent Document 1).
JP 2003-239771 A

  Control that automatically operates the engine speed control mechanism in conjunction with the speed change operation (referred to as auto-idling control) eliminates the hassle of returning the hand accelerator lever to the idling position while driving is stopped. Although excellent, when the travel stop is performed for a long time without performing the engine stop operation, the fuel is wasted in the meantime.

  In particular, in a rice transplanter, when the seedlings in the seedling planting device are consumed during the planting run, the seedling planting operation is performed to replenish the seedling planting device with the spare seedlings stored in the stand for the seedlings of the traveling aircraft. In addition, when there are no spare seedlings stored in the reserve seedling table, the machine body is moved to the edge and the prepared seedlings prepared in the basket are carried into the reserve seedling table. These seedling work and spare seed carry-in work are carried out while stopping the travel, but the frequency is quite high, so even if the above auto-idling control is performed, the entire rice planting work is consumed while the travel is stopped. The amount of fuel used is not negligible.

  The present invention has been made paying attention to such points, and has as its main purpose to further improve fuel consumption and reduce noise.

  1st invention is provided with the detection means which detects that the shift operating tool for driving exists in the specific position which brings a driving stop state, and the engine automatic stop means which stops an engine based on this detection Features.

  According to the above-described configuration, when the travel is stopped by operating the speed change operation tool to the specific position, the engine is automatically stopped, and the waste of fuel and the generation of noise are suppressed.

  Therefore, according to the first aspect of the present invention, wasteful fuel consumption and noise reduction during stoppage during work travel can be achieved, which is effective in reducing running costs and preventing environmental deterioration. In particular, it is effective for rice transplanters that frequently stop traveling during the work for seedling work and spare seed carry-in work.

According to a second invention, in the first invention,
The specific position is installed at a position deviating from the speed change operation path of the speed change operating tool.

  According to the above configuration, it is possible to prevent the engine from being stopped by inadvertently operating to a specific position during a normal shift operation, which is preferable in terms of handling.

According to a third invention, in the first or second invention,
The shift operation tool is urged to move toward the specific position.

  According to the above configuration, the specific position where the running is stopped and the engine is stopped can be easily recognized with an operation feeling, and it is easy to quickly operate the specific position without directly viewing the speed change operation tool.

A fourth invention is the invention according to any one of the first to third inventions,
The shift operation tool is provided with resistance applying means for applying resistance to the shift operation path from the shift operation path to the specific position.

  According to the above configuration, an appropriate grace time for overcoming the resistance is given for the shift operation tool to move to the specific position, so that the shift operation tool is not moved to the specific position at a stretch, which is effective in suppressing erroneous operations. Become.

According to a fifth invention, in the third invention,
The shift operation tool is provided with resistance applying means for applying resistance to the shift operation path from the shift operation path to the predetermined position, and the resistance applying force of the resistance applying means is applied to the shift operation tool to the specific position. It is set larger than the power.

  According to the above configuration, it is not only easy to recognize a specific position with an operation feeling, but it can not be moved to a specific position unless an operation that overcomes the resistance force is consciously performed, and it is further excellent in an erroneous operation prevention function. Become.

According to a sixth invention, in the third invention,
The shift operation tool is provided with resistance applying means for applying resistance to the shift operation path from the shift operation path to the predetermined position, and the resistance applying force of the resistance applying means is applied to the shift operation tool to the specific position. It is set smaller than the power.

  According to the above configuration, the shifting operation tool that is about to be biased to a predetermined position is less likely to move to a specific position by overcoming resistance in the middle of the shifting operation tool. There is no such thing as receiving a lot of noise and making noise.

A seventh invention is the invention according to any one of the first to sixth inventions,
The engine starting means is activated by detecting that the shift operation tool shifts to the operation position deviated from the specific position.

  According to the above configuration, the engine is automatically stopped when the shift operation tool is moved to a specific position to stop traveling, but then when the shift operation tool is operated to the travel shift position to move the airframe, Thus, the engine is started and the running is resumed, and no special engine starting operation is required, and the operability is excellent.

  1 and 2 show a riding type rice transplanter as an example of a farm work machine. In this type rice transplanter, a seedling planting device 4 is driven by a hydraulic cylinder 5 at the rear of a riding type traveling machine body 3 having a pair of left and right front wheels 1 that can be steered and a pair of rear wheels 2 that cannot be steered. In addition to being connected to be movable up and down via a parallel quadruple link mechanism 6, a fertilizer application device 7 is provided at the rear of the machine body.

  A transmission case 9 that pivotally supports the front wheel 1 is connected and fixed to the front part of the body frame 8 in the traveling body 3, and a rear transmission case 10 that pivotally supports the rear wheel 2 is disposed at the rear part of the body frame 8. It is supported so that it can roll freely. An engine 12 is mounted horizontally on a front frame 11 extending forward from the mission case 9 and covered with a bonnet 13, and the front wheel 1 is operated on a boarding operation part located behind the engine 12. A steering handle 14, a driver's seat 15, a step 16 and the like are provided for direct operation, and on the left and right of the front part of the machine body, there are provided spare seedling platforms 17 for placing and storing the spare seedlings in a plurality of stages. .

  The seedling planting device 4 mounts seedlings for six lines, and seedling seedlings 21 that are reciprocated by a set stroke in the left-right direction, cut out seedlings one by one from the lower ends of the seedling mounting bases 21, and plant them on the field. It consists of six sets of rotary planting mechanisms 22 and three leveling floats 23 that level the planting location. Further, the fertilizer application device 7 is mounted on the traveling machine body 3 between the driver seat 15 and the seedling planting device 4, and a fertilizer hopper 24 for storing powdered fertilizer and a fertilizer in the fertilizer hopper 24 are set. A feeding mechanism 25 that feeds out the amount by volume, an electric blower 28 that winds the fed fertilizer to a groove forming device 27 provided in each leveling float 23 via a supply hose 26, and the like. It is configured to send fertilizers into the grooves formed in and embed.

  A main transmission 41 comprising a hydrostatic continuously variable transmission (HST) is connected to the side of the transmission case 9 and is linked to the engine 12 by a belt. Branches to the system.

  The main transmission 41 is operated to be shifted by a main transmission lever (transmission operation tool) 46 provided on the left side of the steering handle 14. Next, a transmission operation structure of the main transmission 46 will be described. explain.

  As shown in FIGS. 3 and 4, a support bracket 51 is fixed to a handle post 50 erected so as to support the steering handle 14, and a detent is attached to a left end portion of the support bracket 51 via a support shaft 52. A plate 53 is supported so as to be able to swing back and forth around a lateral fulcrum a, and the main transmission lever 46 is supported on the detent plate 53 so as to be able to swing left and right around a fulcrum fulcrum b. A relay rotation member 55 is supported on a support frame 47 for standingly supporting the handle post 50 so as to be rotatable around a lateral fulcrum c. The relay rotation member 55 and the detent plate 53 are connected via a linkage rod 56. Further, the relay rotation member 55 and the speed change arm 58 connected to the speed change operation shaft 57 of the main transmission 41 are linked via an operation rod 59.

  As shown in FIG. 5, a guide plate 60 is fixed to the support bracket 51, and is extended downward from a base portion of the main transmission lever 46 into a stepped guide groove 61 formed in the guide plate 60. The guide rod 46a is penetrated, and the main transmission lever 46 is swung back and forth along a predetermined step operation path by the engagement guide action of the guide groove 61 and the guide rod 46a. On the other hand, the main transmission 41 can be shifted in the range from the forward range to the reverse range by rotating it.

  The step difference portion of the step operation path corresponds to the neutral position N of the main transmission 41, the forward shift operation path F is formed in front of the step change operation path R, and the reverse change operation path R is formed in the rear. The detent roller 64 supported on the free end of the cantilever spring lever 63 is elastically engaged with nine recesses 62 formed in parallel on the outer periphery of the outer periphery, thereby moving the main transmission lever 46 forward 5 steps (F1 to F5), and the neutral position N. , And can be held at the respective three shift positions (R1 to R3).

  Further, a torsion spring 65 is provided at the fulcrum b which is the lateral operation center of the main transmission lever 46, and the main transmission lever 42 is always urged to swing around the fulcrum b. Therefore, when the main transmission lever 46 is operated to the neutral N, the main transmission lever 46 is urged and moved toward the forward side neutral Nf side facing the forward transmission operation path F.

  The main transmission lever 46 is involved not only in operating the main transmission 41 but also in starting / stopping the engine 12 and adjusting the engine speed, and the configuration for that purpose will be described below.

  The support bracket 51 that supports the main transmission lever 46 so as to swing back and forth is attached with a potentiometer 70 that continuously detects the front and rear operation position of the main transmission lever 46 from the rotational position of the support shaft 52. Based on detection information from the potentiometer 70, speed control of the engine 12 is performed.

  That is, as shown in the control block diagram of FIG. 6, the speed adjusting mechanism 71 provided in the engine 12 is configured to be accelerator-set by a servo-controlled electric actuator 72 such as a solenoid or a servo motor. The electric actuator 72 is configured to operate and control the speed adjusting mechanism 71 corresponding to the operation position of the main speed change lever 46. When the main speed change lever 46 is in the neutral position N, the speed adjusting mechanism 71 is set to a predetermined idling rotational speed, and the main speed change lever 46 is operated to the high speed side in the forward speed change operation path F and the reverse speed change operation path R. The accelerator is set with the characteristics set in advance so that the engine speed increases as the engine speed increases.

  In addition, an engine stop position ES is set as a specific position for stopping the engine on the lateral outer side of the forward-side neutral Nf in the guide groove 61, and the guide rod 46a of the main transmission lever 46 is operated to the engine stop position ES. A switch 73 for detecting this is provided on the guide plate 60.

  The switch 73 is connected to the engine stop circuit 74 via the control device 20, and the engine stop circuit 74 is activated when the guide rod 46a is continuously operated at the engine stop position ES for a set time (for example, several seconds). The engine 12 is programmed to stop.

  When the engine 12 is a gasoline engine, the engine stop circuit 74 is used to stop the engine by grounding the engine ignition circuit. When the engine 12 is a diesel engine, the fuel supply is cut off. The one that stops the engine is used.

  Further, when the key switch 76 is operated to the “ON” position and the main transmission lever 46 (guide rod 42a) is released from the engine stop position ES while the engine 12 is stopped, the engine start circuit 77 is activated. Then, the cell motor 78 is started and the engine is started. Note that, while the engine start circuit 77 is operating, the accelerator-up control is performed so that the speed control mechanism 71 has a starting rotational speed that is slightly higher than the idling rotational speed. If the accelerator set control is executed, the engine can be reliably started.

  [Other Examples]

  (1) As shown in FIG. 8, an elastic resistance member 79 made of a spring plate is provided as a resistance applying means between the forward side neutral Nf in the guide groove 61 and the engine stop position ES, and the forward side neutral Nf. It can also be configured and implemented so that an appropriate resistance is given to the movement from the engine to the engine stop position ES.

  In this case, the resistance force by the elastic resistance member 79 is set to be larger than the urging force that the main transmission lever 46 is operated toward the engine stop position ES by the torsion spring 65, so that the main transmission lever 46 is moved to the neutral position. Even if it is free at N, it does not immediately shift to the engine stop position ES, but intentionally moves over the elastic resistance member to shift to the engine stop position ES.

  (2) In the structure shown in FIG. 8, if the resistance force by the elastic resistance member 79 is set smaller than the urging force that the main transmission lever 46 is operated toward the engine stop position ES by the torsion spring 65, By making the speed change lever 46 free at the neutral position N, the engine is automatically shifted to the engine stop position ES. However, the main speed change lever 46 gets over the elastic resistance member 79, and the momentum is reduced to the guide plate 60. The engine is slowly shifted to the engine stop position ES without being received by the shock.

  (3) In the above embodiment, the case where the main transmission 41 is operated by a lever is illustrated, but the present invention can also be applied to a model using a shift pedal as a shift operation tool.

Whole side view of rice transplanter Overall plan view of rice transplanter Side view of speed change operation structure Front view of gear shifting operation structure Plan view of shift guide structure Control block diagram Control flow diagram Front view of a shift guide structure in another embodiment

Explanation of symbols

12 Engine 46 Shifting operation tool 79 Resistance applying means ES Specific position

Claims (7)

  A farming machine comprising: a detecting unit that detects that a traveling speed change operation tool is in a specific position that causes a traveling stop state; and an engine automatic stopping unit that stops the engine based on the detection. Engine control structure.   2. The engine control structure for an agricultural machine according to claim 1, wherein the specific position is installed at a position deviated from a speed change operation path of the speed change operation tool.   The engine control structure for an agricultural machine according to claim 1 or 2, wherein the shift operating tool is biased to move toward the specific position.   The engine control structure for an agricultural machine according to any one of claims 1 to 3, further comprising resistance applying means for applying resistance to the shift operating tool from the shift operating path to the specific position.   The shift operation tool includes a resistance applying unit that applies resistance to the shift operation path from the shift operation path to the previous specific position, and a resistance force of the resistance applying unit is applied to the specific position provided to the shift operation tool. 4. The engine control structure for an agricultural machine according to claim 3, wherein the engine control structure is set to be larger than a power.   The shift operation tool includes a resistance applying unit that applies resistance to the shift operation path from the operation path for shifting to the specific position, and a resistance force of the resistance applying unit is applied to the specific position provided to the shift operation tool. The engine control structure for an agricultural machine according to claim 3, wherein the engine control structure is set to be smaller than a power.   The engine control of the agricultural working machine according to any one of claims 1 to 6, wherein the engine start means is activated by detecting that the shift operation tool shifts to an operation position deviating from the specific position. Construction.

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