CN101535168A - Pressurized-oil supply amount control device for vehicle-mounted crane - Google Patents

Pressurized-oil supply amount control device for vehicle-mounted crane Download PDF

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Publication number
CN101535168A
CN101535168A CNA2007800417183A CN200780041718A CN101535168A CN 101535168 A CN101535168 A CN 101535168A CN A2007800417183 A CNA2007800417183 A CN A2007800417183A CN 200780041718 A CN200780041718 A CN 200780041718A CN 101535168 A CN101535168 A CN 101535168A
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flow
control
oil
pressure pump
oil pressure
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CN101535168B (en
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木谷友彦
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Furukawa Unic Corp
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Furukawa Unic Corp
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Priority claimed from JP2006324506A external-priority patent/JP5032102B2/en
Priority claimed from JP2006345394A external-priority patent/JP5248011B2/en
Application filed by Furukawa Unic Corp filed Critical Furukawa Unic Corp
Priority claimed from PCT/JP2007/070434 external-priority patent/WO2008056526A1/en
Publication of CN101535168A publication Critical patent/CN101535168A/en
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Abstract

The present invention provides a pressurized-oil supply amount control device for a vehicle-mounted crane which has a dual pump system and which is capable of further inhibiting possible noise from an engine and improving fuel consumption. A predetermined control function is set for a controller 2 for the pressurized-oil supply amount control device. Three regions R1, R2, R3 are set for the predetermined control function according to the rate of an operation signal input. Based on the predetermined control function, the rotation speed of the engine 6 is controlled, and the flow rate of pressurized oil is controlled by a flow rate control valve 5. This increases the total flow rate G of pressurized oil supplied to a control valve 3 in proportion to the rate of the operation signal input to the crane.

Description

The pressurized-oil supply amount control device of crane truck
Technical field
The present invention relates to be loaded into the pressurized-oil supply amount control device of the crane truck on the vehicles such as truck, particularly be suitable for constituting the pressurized-oil supply amount control device of the crane truck of working as oil pressure source with the oil pressure pump that driving engine was driven of this vehicle.
Background technology
As the pressurized-oil supply amount control device of this crane truck, for example known technology that has patent documentation 1 to be put down in writing.
In the technology of patent documentation 1 record, for example shown in Figure 9, pressurized-oil supply amount control device has main oil pressure pump 7 and the secondary oil pressure pump 8 that is driven simultaneously by driving engine 6.And, be equipped with the flow-controlling gate 5 of the flow of the pressure oil that control discharges from secondary oil pressure pump 8, the pressure oil of discharging and be adjusted to by flow-controlling gate 5 any flow from secondary oil pressure pump 8 is converged with the pressure oil of discharging from main oil pressure pump 7, be supplied to control cock 3.
In this pressurized-oil supply amount control device, governor (govemor) 20 with fuel injection amount of throttle cylinder (accelerator cylinder) 4 and control driving engine 6, this throttle cylinder 4 is coupled to each other by the 1st connecting rod 21 with governor 20, and the flow-controlling gate 5 of throttle cylinder 4 and secondary oil pressure pump 8 is coupled to each other by the 2nd connecting rod 22 that moves simultaneously with the 1st connecting rod 21.Therefore, throttle cylinder 4 has fixing action relationships with flow-controlling gate 5, utilizes this fixing action relationships can control pressurized-oil supply amount reliably.
And, operation input in response to controller 120, the throttle cylinder 4 of rotating speed to control driving engine 6 is controlled, simultaneously, make flow-controlling gate 5 actions of the secondary oil pressure pump 8 that connects with throttle cylinder 4 via the 2nd connecting rod 22, thus, the pressure oil of discharging and be adjusted to by flow-controlling gate 5 predetermined amount of flow from secondary oil pressure pump 8 is converged with the pressure oil of discharging from main oil pressure pump 7, be supplied to the control cock 3 of hoisting crane.
According to the pressurized-oil supply amount control device that the document is put down in writing, for example compare with the crane truck of only having equipped the main oil pressure pump, can suppress the noise of driving engine, and improve the fuel utilization ratio.
Patent documentation 1: the special fair 6-6476 communique of Japan
Patent documentation 2: Japanese kokai publication hei 9-216790 communique
In addition, the volume of main oil pressure pump 7 is set to the pressure oil that can discharge rated pressure, thereby even to stall situation can not take place under the idling mode low at engine speed, that torque is little yet.And the volume of secondary oil pressure pump 8 is set to: can rise at engine speed, torque become big after, drive simultaneously with main oil pressure pump 7 and discharge the pressure oil of rated pressure.
The purpose of this system is, under the situation low at engine speed, that torque is little, makes the pressure oil from secondary oil pressure pump 8 return fuel tank 9 by flow-controlling gate 5, and only the Pressure oil feeder of in the future autonomous oil pressure pump 7 is to control cock 3 sides, to suppress the torque load of driving engine 6.
In addition, under the situation that engine speed rises, the torque change is big, open the flow-controlling gate 5 that is used to control from the flow of the pressure oil of secondary oil pressure pump 8, make from the pressure of secondary oil pressure pump 8 pressure oil oily and and converge from main oil pressure pump 7, only pressurized-oil supply amount is increased required amount, reduce engine speed as far as possible, realize energy-conservation thus and low noise.
Here, in order in this pressurized-oil supply amount control device, further to realize energy-conservation and low noise, as long as the pressure oil from secondary oil pressure pump 8 is converged in the lower stage of engine speed.But because the type of the vehicle of toter or the difference of vehicle manufacturer, generation can drive main oil pressure pump 7 simultaneously, and discharge the engine speed of torque of pressure oil of rated pressure with secondary oil pressure pump 8 different.Therefore, must with the cooresponding engine speed of each vehicle under, the pressure oil from secondary oil pressure pump 8 is converged.
But, in the technology of patent documentation 1 record, throttle cylinder 4 is coupled to each other by the 1st connecting rod 21 with governor 20, and throttle cylinder 4 is coupled to each other by the 2nd connecting rod 22 with flow-controlling gate 5 simultaneously, therefore can't change the relation between the dominant discharge of engine speed and flow-controlling gate 5.
Therefore,, improve engine speed slightly, the pressure oil from secondary oil pressure pump 8 is converged with after guaranteeing required torque in order in different vehicle such as engine characteristics, also to avoid the motor torque deficiency.Promptly, because engine speed roughly rises pro rata with the connecting rod amount of movement in gamut, therefore in order to avoid the motor torque deficiency all the time, Yi Bian need to improve engine speed slightly to guarantee required torque, Yi Bian the pressure oil from secondary oil pressure pump 8 is converged.
Therefore, technology according to patent documentation 1 record, for example can drive main oil pressure pump 7 and secondary oil pressure pump 8 simultaneously with lower engine speed and discharge in the vehicle of torque of pressure oil of rated pressure can producing, engine speed can rise to the degree that is higher than requirement.Therefore, aspect energy-conservation and reduction noise, further room for improvement is arranged still.
Summary of the invention
Therefore, the present invention is conceived to this problem just and finishes, and its purpose is, provide a kind of double pump formula, can further suppress engine noise and improve the pressurized-oil supply amount control device of the crane truck of fuel utilization ratio.
In order to solve above-mentioned problem, among the present invention the 1st invention is a kind of pressurized-oil supply amount control device, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from described secondary oil pressure pump is the flow-controlling gate of expectation flow, and can be according to control the rotating speed of described driving engine and the controller of described flow-controlling gate at the operation signal input of described hoisting crane, the pressure oil of the described secondary oil pressure pump after the described flow control valve regulation is converged with the pressure oil of discharging from described main oil pressure pump, it is supplied to the control cock that is used to drive described hoisting crane, it is characterized in that, described controller has: the motor speed control unit, and it controls the rotating speed of described driving engine; And delivery flow control unit, its control is from the flow of the pressure oil of described flow-controlling gate discharge, described delivery flow control unit comprises following flow control: the 1st flow control: described flow-controlling gate is closed fully, only with the Pressure oil feeder of described main oil pressure pump to described control cock; The 2nd flow control: the pressure oil of described secondary oil pressure pump is converged with the pressure oil of discharging from described main oil pressure pump, and the discharge rate of the pressure oil after converging is changed according to the ratio of described operation signal input proportionally, the Pressure oil feeder after will converging is to described control cock; And the 3rd flow control: described flow-controlling gate is opened fully, supply with the pressure oil of the maximum that can discharge from described main oil pressure pump and secondary oil pressure pump to described control cock, described motor speed control unit comprises following rotating speed control: the control of the 1st rotating speed: the rotating speed of described driving engine is changed according to the ratio of described operation signal input proportionally, rise to the torque deficiency that described driving engine can not occur and produce the 2nd engine speed of enough torques from idling speed; The 2nd rotating speed control: make the rotating speed of described driving engine remain on described the 2nd engine speed; And the 3rd rotating speed control: make the ratio of the rotating speed of described driving engine according to described operation signal input, rise to than its 3rd higher engine speed from described the 2nd engine speed pro rata, described controller is carried out following control: when the ratio of described operation signal input is in less than the 1st ratiometric the 1st zone, carries out described the 1st rotating speed control and correspondingly carry out described the 1st flow control; When the ratio of described operation signal input is in more than or equal to the 1st ratio and less than than big the 2nd ratiometric the 2nd zone of the 1st ratio the time, carry out described the 2nd rotating speed control and correspondingly carry out described the 2nd flow control; When the ratio of described operation signal input is in more than or equal to the 2nd ratiometric the 3rd zone, carries out described the 3rd rotating speed control and correspondingly carry out described the 3rd flow control.
Pressurized-oil supply amount control device according to the 1st invention, when the ratio of operation signal input is in the 1st zone, only discharge the pressure oil of main oil pressure pump by the 1st flow control of delivery flow control unit, therewith accordingly, the motor speed control unit carries out the control of the 1st rotating speed, that is: engine speed is changed according to the ratio of operation signal input proportionally, rise to from idling speed that motor torque can not to occur not enough and produce the 2nd engine speed of enough torques.Therefore, when for example micromotion etc. only needs seldom pressure oil discharge rate, suppress engine speed lowlyer, therefore can realize energy-conservation and low noise.
And, when the ratio of operation signal input is in the 2nd zone, the motor speed control unit keeps can not occurring the 2nd enough engine speed of motor torque deficiency by the control of the 2nd rotating speed, and under the 2nd engine speed, the 2nd flow control by the delivery flow control unit accordingly begins to press converging of oil therewith.And, according to the 2nd flow control, converge in the mode that the discharge rate of the pressure oil after converging changes according to the ratio of operation signal input proportionally, therefore, owing to be to converge, thereby can suppress the extreme change of motor torque in the mode of the proportional variation of discharge rate of the pressure oil after converging.Therefore, can suppress the noise of driving engine, improve the fuel utilization ratio.In addition, owing to be after engine speed is increased to the 2nd engine speed in advance, just to begin to press converging of oil, therefore can under situation about not causing to stall, begin swimmingly to converge, and can stablize flowing of the pressure oil of being discharged, thereby can make the action of hoisting crane more stable.
In addition, when the ratio of operation signal input is in the 3rd zone, the delivery flow control unit opens flow-controlling gate by the 3rd flow control fully, the pressure oil of the maximum that discharge can be discharged from main oil pressure pump and secondary oil pressure pump, therewith accordingly, the motor speed control unit is by the control of the 3rd rotating speed, proportional ground rises to 3rd engine speed higher than the 2nd engine speed to the rotating speed that makes driving engine according to the ratio of operation signal input, therefore after flow-controlling gate is opened fully, also can suppress the extreme change of motor torque.Therefore, can suppress the noise of driving engine, improve the fuel utilization ratio.
Here, in the pressurized-oil supply amount control device of the 1st invention, preferably, described controller is by the cooperation of described motor speed control unit and described delivery flow control unit, the total flow that makes the pressure oil of supplying with to described control cock according to the ratio of described operation signal input, rises in whole zone pro rata.According to this structure, the total flow of the pressure oil of supplying with to control cock in whole zone according to the ratio of operation signal input, increase pro rata, therefore the pressure oil of discharging is mobile more stable, thereby the noise that can suppress driving engine better, further improve the fuel utilization ratio, and make the action of hoisting crane more stable.
In addition, in the pressurized-oil supply amount control device of the 1st invention, preferably the maximum throughput with described main oil pressure pump is set at littler than the maximum throughput of described secondary oil pressure pump.That this structure more helps is low at engine speed, the torque load of torque hour inhibition driving engine.And then preferably the maximum throughput of described main oil pressure pump is set at and carries out the required enough discharge rates of micromotion.That this structure helps more is low at engine speed, the torque load of torque hour inhibition driving engine.
In addition, the 2nd invention of the present invention is a kind of pressurized-oil supply amount control device, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from this pair oil pressure pump is the flow-controlling gate of predetermined amount of flow, and according to controlling the rotating speed of described driving engine and the controller of described flow-controlling gate respectively individually at the operation of described hoisting crane input, pressure oil after the described flow control valve regulation is converged with the pressure oil of discharging from described main oil pressure pump, it is supplied to the control cock that is used to drive described hoisting crane, it is characterized in that, in described controller, set the relation between the oily predetermined amount of flow of pressure that the rotating speed and the described flow-controlling gate of a plurality of operation inputs at described hoisting crane and described driving engine realize, and, can select expected relationship in a plurality of relations of described setting, according at the operation input of described hoisting crane and the desired relationship of described selection, control the rotating speed of described driving engine and the pressure oil predetermined amount of flow of described flow-controlling gate realization separately.
Pressurized-oil supply amount control device according to the 2nd invention, can distinguish the pressure oil predetermined amount of flow that independent control vehicle engine speed and flow-controlling gate realize, and this separately a plurality of relations of control that are used for have been set, and can select expected relationship in these a plurality of relations, therefore, for example can carry out more suitable control to engine speed and flow-controlling gate according to the engine characteristics of the vehicle of toter.Therefore, for example under the situation of the vehicle of the torque that is applied to produce the pressure oil that can drive main oil pressure pump and secondary oil pressure pump simultaneously and discharge rated pressure with lower engine speed, can be than more energy-conservation and noise is lower in the past.
Here, in the pressurized-oil supply amount control device of above-mentioned the 1st～the 2nd invention, preferably, described control cock is stacked control cock, the green phase alternating layers are folded following each valve and are formed stacked structure, described each valve is: a plurality of transfer valves of indirect type of drive, and it is used to drive each actuator of described hoisting crane; Flow-controlling gate, it is regulated from the flow of the pressure oil of described secondary oil pressure pump discharge, and itself and the pressure oil of discharging from described main oil pressure pump are converged, and carries to described a plurality of transfer valves; Two unloading overflow valves, it is inserted into respectively between described a plurality of transfer valve and described main oil pressure pump and the described secondary oil pressure pump; Reducing valve and back pressure valve, it is only obtained from described main oil pressure pump and drives the required pilot oil of described a plurality of transfer valves.
According to this structure of control cock, it is stacked mutually that a plurality of transfer valves, flow-controlling gate, unloading overflow valve and being used to obtains the reducing valve and the back pressure valve of pilot oil, constitutes stacked control cock, therefore can save the space, improves assembleability.
And, according to this stacked control cock, on the pipeline between a plurality of transfer valves and main oil pressure pump and the secondary oil pressure pump, respectively plug-in mounting two unloading overflow valves, therefore, by making two unloading overflow valve actions, can make pressure oil not turn back to fuel tank by transfer valve from each pump.Therefore, for example can be at the urgent hoisting crane that constantly promptly stops.
In addition, according to this stacked control cock, therefore reducing valve and back pressure valve with the required pilot oil of the transfer valve that is used to obtain to drive indirect type of drive can for example carry out the operation that promptly stops in urgent moment by remote operation (controlled in wireless operation).And, because only obtaining from the main oil pressure pump, these reducing valves and back pressure valve drive the required pilot oil of a plurality of transfer valves, therefore, compare with the situation that reducing valve and back pressure valve are set in main oil pressure pump and pipeline after secondary oil pressure pump converges, and can suppress the oil temperature and rise.
In addition, in the pressurized-oil supply amount control device of above-mentioned the 1st invention, be to constitute the structure that the pressure that makes secondary oil pressure pump pressure oil oily and the main oil pressure pump converges for example by flow-controlling gate.On the other hand, in this crane truck, generally be equipped with the overload prevention apparatus that hoisting crane is controlled to be expectation state according to the rate of load condensate of hoisting crane.As this overload prevention apparatus, known just like lower device: this device has the flow-controlling gate of other setting, this flow-controlling gate is used for the rate of load condensate according to hoisting crane, the flow (for example with reference to patent documentation 2) of the pressure oil that control is supplied with to each transfer valve that is used to drive hoisting crane.Technology according to this patent documentation 2 is put down in writing can be controlled to be expectation state with hoisting crane according to the rate of load condensate of hoisting crane.
Therefore, consider the technology of patent documentation 2 records is attached in the pressurized-oil supply amount control device of above-mentioned the 1st invention.Yet, iff merely making up these technology, need to have be respectively applied for double pump converge and with flow-controlling gate rate of load condensate corresponding flow control, that structure is identical, therefore at simplification device, be suppressed to this aspect room for improvement still arranged.
Therefore, the invention of the 3rd among the present invention is conceived to this problem just and finishes, and its purpose is, but provides a kind of dual-purpose of double pump formula to converge the flow-controlling gate of usefulness and come the pressurized-oil supply amount control device of the flow-controlling gate of dominant discharge according to rate of load condensate.
Promptly, among the present invention the 3rd invention is a kind of pressurized-oil supply amount control device, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from described secondary oil pressure pump is the flow-controlling gate of expectation flow, can with the pressure oil bypass of discharging from described main oil pressure pump and secondary oil pressure pump to the main oil pressure pump of fuel tank with unloader valve and secondary oil pressure pump unloader valve, and can be according to control the rotating speed of described driving engine and the controller of described flow-controlling gate at the operation signal of described hoisting crane, the pressure oil of the described secondary oil pressure pump after the described flow control valve regulation is converged with the pressure oil of discharging from described main oil pressure pump, and it is supplied to each transfer valve that is used to drive described hoisting crane, it is characterized in that, except to the operation signal of described controller input at described hoisting crane, also to the rate of load condensate cooresponding load signal of its input with described hoisting crane, described controller constitutes: control described flow-controlling gate according to the operation signal of described input; And, control described flow-controlling gate according to the load signal of described input, the flow of the pressure oil of discharging from described secondary oil pressure pump when making the load signal of this input big is lower than load signal flow hour; Perhaps, make described each unloader valve action.
Pressurized-oil supply amount control device according to the 3rd invention, in controller, input is with the cooresponding load signal of crane load rate with at the operation signal of hoisting crane respectively, control above-mentioned flow-controlling gate according to these load signals and operation signal, therefore, can utilize a flow-controlling gate to be used for to converge the flow control of pressing oil and control with the rate of load condensate corresponding flow.And, in this controller, with flow-controlling gate of the preferential control of cooresponding load signal one side of the rate of load condensate of hoisting crane, therefore can make flow become the state of expectation reliably in above-mentioned load signal and the operation signal according to the rate of load condensate of hoisting crane.
Here, in the pressurized-oil supply amount control device of the 3rd invention, preferably, when the load signal of described input is in the 1st scope less than the 1st predetermined value, only according to controlling described flow-controlling gate at the operation signal of described hoisting crane; Be at the load signal of described input and surpass described the 1st predetermined value and during less than the 2nd scope of the 2nd predetermined value bigger than the 1st predetermined value, control described flow-controlling gate, the flow that makes the pressure oil of discharging from described secondary oil pressure pump reduces greatly with the change of described load signal, and, control described flow-controlling gate according to described operation signal; Be at the load signal of described input and surpass described the 2nd predetermined value and during less than the 3rd scope of 3rd predetermined value bigger, to close the control of described flow-controlling gate fully than the 2nd predetermined value; When the load signal of described input is in the 4th scope that surpasses described the 3rd predetermined value, make described each unloader valve action, make pressure oil bypass from main oil pressure pump and secondary oil pressure pump to fuel tank.
According to this structure, set 4 scopes according to the rate of load condensate of hoisting crane, therefore help more being controlled to be and the cooresponding expectation state of crane load rate.
That is, for example in the 1st lower scope of rate of load condensate, only come the dominant discharge control cock, therefore can carry out sensitive operation according to operation signal at hoisting crane; In addition, for example in rate of load condensate is moderate the 2nd scope, the dominant discharge control cock makes the flow of the pressure oil of discharging from secondary oil pressure pump become big along with load signal and reduces, therefore can with the cooresponding speed of the level of this rate of load condensate under carry out crane operation; In addition, for example in the 3rd higher scope of rate of load condensate, therefore the control that flow-controlling gate is closed fully can carry out the low speed action of the hoisting crane speed equal extent when moving with dead slow speed; In addition, in the 4th scope, make the unloading overflow valve action, can stop crane operation.Therefore, help hoisting crane is controlled to be the state of expectation.
As mentioned above, the invention of the 1st～the 2nd in according to the present invention, can provide the double pump formula, can further suppress engine noise and improve the pressurized-oil supply amount control device of the crane truck of fuel utilization ratio.In addition, according to the 3rd invention of the present invention, but can provide the dual-purpose of double pump formula to converge the flow-controlling gate of usefulness and come the pressurized-oil supply amount control device of the flow-controlling gate of dominant discharge according to rate of load condensate.
Description of drawings
Fig. 1 is the figure of the 1st embodiment of the hydraulic circuit of the explanation pressurized-oil supply amount control device that comprises crane truck of the present invention.
Fig. 2 is the figure that the predetermined control function (the control mapping of adopting in the pressurized-oil supply amount control and treatment) that adopts in the control setup shown in Figure 1 is described.
Fig. 3 illustrates the relatively figure of another control function of usefulness (the control mapping of adopting in the pressurized-oil supply amount control and treatment).
Fig. 4 is the figure of the 1st control function that control setup adopted (the 1st control mapping of adopting in the pressurized-oil supply amount control and treatment) of explanation the 2nd embodiment.
Fig. 5 is the figure of the 2nd control function that control setup adopted (the 2nd control mapping of adopting in the pressurized-oil supply amount control and treatment) of explanation the 2nd embodiment.
Fig. 6 is the figure of the radio operation device of explanation crane truck of the present invention, and Fig. 6 (a) is the block diagram of radio operation device, and Fig. 6 (b) is a lateral plan.
Fig. 7 is the figure of the predetermined control function that control setup adopted (the control mapping of adopting in the pressurized-oil supply amount control and treatment) of explanation the 3rd embodiment.
Fig. 8 is by the controller of the 3rd embodiment diagram of circuit that carry out, that carry out the program of pressurized-oil supply amount control and treatment.
Fig. 9 is the figure of an example of the hydraulic circuit of the explanation pressurized-oil supply amount control device that comprises crane truck in the past.
Label declaration
1: input device; 2: controller; 3: control cock; 4: the throttle cylinder; 5: flow-controlling gate; 6: driving engine; 7: the main oil pressure pump; 8: secondary oil pressure pump; 9: fuel tank; 10: overload prevention apparatus; 11: pressurized-oil supply amount management department; 12: motor speed control portion (motor speed control unit); 13: delivery flow control part (delivery flow control unit); 20: governor; 21: the 1 connecting rods; 24: major loop; 27,29: unloading overflow valve; 40: transfer valve; 46: back pressure valve; 47: reducing valve; 50,51,52,53,54,55: signal wire (SW); 60: the radio operation device.
The specific embodiment
Below, suitably with reference to the 1st embodiment of the pressurized-oil supply amount control device of description of drawings crane truck of the present invention.In addition, the structure mark identical label identical with above-mentioned conventional example described.
Fig. 1 is the figure that the hydraulic circuit of the pressurized-oil supply amount control device that comprises crane truck of the present invention is described.
As shown in the drawing, the pressurized-oil supply amount control device of this crane truck (following also abbreviate as " control setup ") has and is used for the input device 1 that the operator imports the operation signal input of expectation, this input device 1 can be via signal wire (SW) 50 to the operation cooresponding operation signal (in addition, back can to controller 2 be described in detail) of controller 2 outputs with the operator.
And this control setup has main oil pressure pump 7 and the secondary oil pressure pump 8 that is driven simultaneously by driving engine 6.The discharge side of main oil pressure pump 7 is connected directly to control cock 3 via the major loop 24 of hydraulic circuit.
In addition, secondary oil pressure pump 8 constitutes: its discharge side is connected with major loop 24 via flow-controlling gate 5, and the pressure oil of the secondary oil pressure pump 8 after flow-controlling gate 5 is regulated and the pressure oil of discharging from main oil pressure pump 7 are converged, and the Pressure oil feeder after will converging is to control cock 3.Here, the discharge rate of main oil pressure pump 7 is less than the discharge rate of secondary oil pressure pump 8, and especially, the discharge rate of main oil pressure pump 7 is set to the discharge rate of the fine motion operation of enough carrying out hoisting crane in the present embodiment.
Flow-controlling gate 5 connects with controller 2 via signal wire (SW) 52, can be according to the control signal that comes self-controller 2, and the flow regulating of the pressure oil that will discharge from secondary oil pressure pump 8 is a predetermined amount of flow.
And, in control cock 3, be provided with the transfer valve 40 that is used for driving respectively each actuator at each actuator (not shown) of hoisting crane.And each transfer valve 40 is connected with controller 2 via signal wire (SW) 53, according to come self-controller 2 with the cooresponding control signal of aforesaid operations signal, carry out the change action of oil circuit.
Below, this control cock 3 is described in detail.
As shown in Figure 1, the control cock 3 of this crane truck has a plurality of transfer valves 40 of indirect type of drive, and constitute stacked (stack) type with respect to these a plurality of transfer valves 40, that is: from a plurality of transfer valve 40 sides, carry out stacked successively according to the order of pressure-compensated valve 45, flow-controlling gate 5, unloading overflow valve 27, reducing valve 47, back pressure valve 46 and unloading overflow valve 29.
Here, as shown in the drawing, from the discharge side of main oil pressure pump 7, the order according to unloading overflow valve 29, reducing valve 47, back pressure valve 46 and pressure-compensated valve 45 in above-mentioned each valve that constitutes control cock 3 is connected with main oil pressure pump 7.In addition, reducing valve 47 and back pressure valve 46 only obtain to drive required manipulation (pilot) oil of a plurality of transfer valve 40 from main oil pressure pump 7, thus, can be only pressure oil by main oil pressure pump 7 obtain the required pilot oil of each transfer valve 40.
In addition, flow-controlling gate 5 links to each other with the discharge side of secondary oil pressure pump 8 with unloading overflow valve 27.And the flow regulating of the pressure oil that this flow-controlling gate 5 can be discharged secondary oil pressure pump 8 is desired flow, and its pressure oil with 7 discharges of main oil pressure pump is converged, and the pressure oil after will converging is delivered to a plurality of transfer valves 40.And this control cock 3 can make the pressure oil from each pump 7,8 not turn back to fuel tank 9 by transfer valve 40 by making above-mentioned two unloading overflow valves, 27,29 actions, for example can be at the urgent hoisting crane that constantly promptly stops.
And as shown in Figure 1, this control setup has throttle cylinder 4 and governor 20, and throttle cylinder 4 and governor 20 are coupled to each other by the 1st connecting rod 21.In addition, this throttle cylinder 4 also is connected with controller 2 via signal wire (SW) 51, based on coming driving with the cooresponding control signal of aforesaid operations signal of self-controller 2.
And then this control setup comes the fuel injection amount of metering needle to driving engine 6 according to the action of throttle cylinder 4 by governor 20, thus can be with the rotating speed of motor speed control for expectation.That is, in the present embodiment, adopted the structure that does not have top illustrative the 2nd connecting rod 22, can control the rotating speed of driving engine 6 and the pressure oil predetermined amount of flow that flow-controlling gate 5 realizes respectively individually by controller 2.
Here, as shown in Figure 1, this controller 2 has: the control pressurized-oil supply amount management department 11 that manages pressurized-oil supply amount according to the operation signal input of input device 1, according to the motor speed control portion 12 of the instruction of controlling pressurized-oil supply amount management department 11 from this to the cooresponding control signal of throttle cylinder 4 outputs, and according to delivery flow control part 13 from the instruction of control pressurized-oil supply amount management department 11 to flow-controlling gate 5 that export cooresponding control signal from, this controller 2 can be carried out following pressurized-oil supply amount control and treatment, controls the rotating speed of driving engine 6 and the pressure oil flow of flow-controlling gate 5 according to the ratio of importing at the operation signal of hoisting crane that is:.In addition, motor speed control portion 12 is corresponding to above-mentioned motor speed control unit, and delivery flow control part 13 is corresponding to above-mentioned delivery flow control unit.
More particularly, this controller 2 has (following all not shown): CPU, and it controls the computing of above-mentioned pressurized-oil supply amount control and treatment and the total system of this control setup according to the expectant control program; ROM, it stores control program of CPU etc. in advance in presumptive area; RAM, it is used for storing the operation result that needs the data of reading from ROM etc. and the CPU calculating process; And I/F (interface), it carries out the input and output of data with respect to external device (ED), and described external device (ED) comprises above-mentioned input device 1, control cock 3, throttle cylinder 4 and flow-controlling gate 5 etc.
And, the I/F of controller 2 and above-mentioned each external device (ED) bus equal signal line (Fig. 1 is by the dotted line of label 50～55 expressions) by being used for transmitting data, connect in the mode that can receive and dispatch data such as operation signal or control signal mutually, thus, can export respectively and the cooresponding control signal of importing from aforesaid operations input media 1 of operation signal to control cock 3, throttle cylinder 4 and flow-controlling gate.
Here, in the presumptive area of ROM, can store the program of carrying out above-mentioned pressurized-oil supply amount control and treatment in the mode of the suitable reference of form that can derive the operation result that needs in the calculating process.In addition, in ROM, store the expectant control function, as the table data.And, can be in the above-mentioned pressurized-oil supply amount control and treatment that controller 2 is carried out with reference to this expectant control function.That is, in the pressurized-oil supply amount control and treatment that controller 2 is carried out,,, set control signal independently to throttle cylinder 4 and flow-controlling gate 5 outputs according to above-mentioned expectant control function according to operation signal input from input device 1.
Below, this predetermined control function and pressurized-oil supply amount control and treatment cooresponding with it are described in detail.
Fig. 2 is the figure of the explanation predetermined control function that this control setup adopted (the control mapping of adopting in the pressurized-oil supply amount control and treatment).
This curve that illustrates is represented can be used as above-mentioned table data and is carried out the control function of reference (control mapping), the curve of below is represented the aperture of flow-controlling gate 5, above the curve below, the total flow G of total pump driving torque when showing engine speed, rated pressure successively and master/secondary oil pressure pump 7,8.In addition, the numerical value of the curve shown in this figure is the numerical value under the following situation: the volume of establishing main oil pressure pump 7 and secondary oil pressure pump 8 all is 30cm 3/ rev, if the idling speed of driving engine is 400rpm, establishing rated speed of rotation is 1000rpm, and establishing the engine speed that produces the enough torques that are unlikely to the torque deficiency is 550rpm, if the reduction ratio of driving engine and pump is 1 (engine speed=revolution speed), establishing rated pressure is 20MPa.
In addition, the driving torque T of oil pressure pump calculates by following (formula 1).In addition, delivery flow Q calculates by following (formula 2).
T=P*q/2 π (formula 1)
Q=q*N (formula 2)
Wherein, P: discharge pressure
Q: pump volume
N: revolution speed
Here, the control pressurized-oil supply amount management department 11 in this controller 2 is set with 3 zones that are used to carry out the cooresponding control of importing with operation signal of ratio.Promptly, as shown in the drawing, in the present embodiment, set respectively as lower area: the ratio of operation signal input less than the ratio of the 1st region R 1 of 10% (the 1st ratio), operation signal input more than or equal to 10% and less than the ratio of the 2nd region R 2 of 44% (the 2nd ratio) and operation signal input more than or equal to 44% the 3rd region R 3.
And above-mentioned delivery flow control part 13 can be carried out and these 3 region R 1, the cooresponding 3 kinds of controls of R2, R3.That is, as shown in the drawing, delivery flow control part 13 constitutes and comprises the 1st flow control V1, the 2nd flow control V2 and the 3rd flow control V3.
Say that at length delivery flow control part 13 carries out following control: in the 1st flow control V1, close flow-controlling gate 5 fully, only with the Pressure oil feeder of main oil pressure pump 7 to control cock 3; In the 2nd flow control V2, when the pressure oil that makes secondary oil pressure pump 8 converged with the pressure oil of discharging from main oil pressure pump 8, the discharge rate that makes the pressure oil after converging changed pro rata according to the ratio of described operation signal input, and the Pressure oil feeder after will converging is to control cock 3; And then in the 3rd flow control V3, open flow-controlling gate 5 fully, supply with the pressure oil of the maximum that can discharge from main oil pressure pump 7 and secondary oil pressure pump 8 to control cock 3.
In addition, above-mentioned motor speed control portion 12 also can carry out and above-mentioned 3 region R 1, the cooresponding 3 kinds of controls of R2, R3.That is, as shown in the drawing, motor speed control portion 12 constitutes and comprises the 1st rotating speed control E1, the 2nd rotating speed control E2 and the 3rd rotating speed control E3.
At length say, motor speed control portion 12 carries out following control: in the 1st rotating speed control E1, the rotating speed that makes driving engine 6 changes according to the ratio of described operation signal input proportionally, rises to from idling speed (400rpm) that driving engine 6 torques can not to occur not enough and produce the 550rpm (the 2nd engine speed) of enough torques; In the 2nd rotating speed control E2, making the rotating speed of driving engine 6 maintain the 2nd engine speed is 550rpm; And then in the 3rd rotating speed control E3, the rotating speed that makes driving engine 6 is that 550rpm rises to higher the 3rd engine speed (1000rpm) from the 2nd engine speed according to the ratio of described operation signal input pro rata.
And when being in above-mentioned the 1st region R 1, motor speed control portion 12 carries out the 1st rotating speed control E1, and therewith accordingly, delivery flow control part 13 is carried out the 1st flow control V1.In addition, when being in above-mentioned the 2nd region R 2, motor speed control portion 12 carries out the 2nd rotating speed control E2, and therewith accordingly, delivery flow control part 13 is carried out the 2nd flow control V2.In addition, when being in the 3rd region R 3, motor speed control portion 12 carries out the 3rd rotating speed control E3, and therewith accordingly, delivery flow control part 13 is carried out the 3rd flow control V3.
Promptly, this controller 2 before the rotating speed of driving engine 6 reaches 550rpm during, make the rotating speed fast rise of driving engine 6, keep this rotating speed in the stage that reaches 550rpm (the 2nd engine speed), and after arriving this state, begin to open the opening of flow-controlling gate 5, the main oil pressure pump 7 and the pressure oil of secondary oil pressure pump 8 are converged, increase total flow G pro rata.Then, after flow-controlling gate 5 is opened fully, make the rotating speed of driving engine 6 begin once more to rise, then increase total flow G pro rata.Thus, this controller 2 is controlled by the cooperation of motor speed control portion 12 and delivery flow control part 13, make the total flow G straight line of the pressure oil supplied with to control cock 3 rise, promptly, as shown in the drawing, the ratio according to the operation signal input in whole region R 1～R3 rises pro rata.
Then, the effect/effect to the pressurized-oil supply amount control device of the crane truck of the 1st embodiment describes.
As mentioned above, control setup according to the 1st embodiment, in this controller 2, when the ratio of operation signal input is in the 1st region R 1, only discharge the pressure oil of main oil pressure pump 7 by the 1st flow control V1 of delivery flow control part 13, therewith accordingly, motor speed control portion 12 carries out the 1st rotating speed control E1, that is: the rotating speed of driving engine 6 is changed according to the ratio of described operation signal input proportionally, rise to the 550rpm (the 2nd engine speed) of the enough torques of generation that driving engine 6 torque deficiencies can not occur from idling speed (400rpm).Therefore, when for example micromotion etc. only needs seldom pressure oil discharge rate,, can realize energy-conservation and low noise by suppressing engine speed lower.
And, according to this controller 2, when the ratio of operation signal input is in the 2nd region R 2, it is 550rpm that motor speed control portion 12 keeps avoiding not enough required the 2nd enough engine speed of driving engine 6 torques by the 2nd rotating speed control E2, and from rising to the 2nd engine speed, the 2nd flow control V2 by delivery flow control part 13 begins to press converging of oil accordingly therewith.Then,, converge, the total flow G of the pressure oil after converging is changed pro rata, therefore can suppress the extreme change of the torque of driving engine 6 according to the 2nd flow control V2.Therefore, can suppress the noise of driving engine 6, improve the fuel utilization ratio.And, owing to be to be increased in advance at rotating speed to avoid just beginning to press converging of oil behind not enough required enough the 2nd engine speeds (550rpm) of driving engine 6 torques with driving engine 6, therefore can under situation about not causing to stall, begin swimmingly to converge, and can stablize flowing of the pressure oil of being discharged, thereby can make the action of hoisting crane more stable.
In addition, according to this controller 2, when the ratio of operation signal input is in the 3rd region R 3, delivery flow control part 13 opens flow-controlling gate 5 by the 3rd flow control V3 fully, the pressure oil of the maximum that discharge can be discharged from main oil pressure pump 7 and secondary oil pressure pump 8, therewith accordingly, motor speed control portion 12 is by the 3rd rotating speed control E3, proportional ground rises to 3rd engine speed (1000rpm) higher than the 2nd engine speed to the rotating speed that makes driving engine 6 according to the ratio of operation signal input, therefore after flow-controlling gate 5 is opened fully, also can suppress the extreme change of the torque of driving engine 6.Therefore, can suppress the noise of driving engine 6, improve the fuel utilization ratio.
In addition, according to this controller 2, cooperation by motor speed control portion 12 and delivery flow control part 13 is controlled, the total flow G of the pressure oil of supplying with to control cock 3 is risen pro rata according to the ratio of operation signal input in whole region R 1～R3, therefore the pressure oil of discharging is mobile more stable, thereby can suppress the noise of driving engine 6 better, further improve the fuel utilization ratio, and make the action of hoisting crane more stable.
For example figure 3 illustrates another control function that is used for comparing with above-mentioned example.In addition, for the predetermined control function and this another control function of the invention described above, the rated speed of rotation of pump volume and driving engine is identical.
As shown in the drawing, this another control function is such example: only adopted a rotating speed control E, this rotating speed control E makes the rotating speed of driving engine 6 rise to 1000rpm from 400rpm pro rata with respect to the operation signal input; And with similarly top, even if the rotating speed that converges, also produces the torque that can not cause waiting to stall and drive from the pressure of secondary oil pressure pump 8 pressure oil oily and from main oil pressure pump 7 is made as 550rpm.
For the flow-controlling gate in this example 5, as shown in the drawing, reach 550rpm from the rotating speed of driving engine 6, promptly, reach 25% from the operation signal input, the flow control V1 ' that closes fully from flow-controlling gate 5 transfers to the flow control V2 ' that needs the beginning opening.In addition, can set the timing that makes the flow control V3 ' that flow-controlling gate 5 opens fully arbitrarily, in the example of this figure, be set at 75% place and open fully.Its result, shown in this figure top, the total flow of supplying with to control cock 3 (discharge rate) becomes the curve that comprises the bending that adds up to flow G1, G2, G3.
Here, the curve of comparison diagram 2 and Fig. 3, because the pump volume is identical with the rated speed of rotation of driving engine 6 for predetermined control function of the present invention and another control function, therefore the total flow of supplying with according to operation signal input is identical.But, for predetermined control function of the present invention shown in Figure 2, owing to be to begin to carry out converging from the pressure oil of secondary oil pressure pump 8 in period more early, the rotating speed that in as the 2nd region R 2 of operation signal zone line, keeps driving engine 6, total flow (discharge rate) G that obtains is linearly risen, therefore compare with another control function shown in Figure 3, can suppress engine speed lower on the whole.Thus, in more than half part of operating area, compare, can suppress engine speed lowlyer with another control function of Fig. 3.
And according to above-mentioned control cock 3, in double pump formula crane truck, can save the space and improve assembleability, even and can promptly stop hoisting crane and can carry out under the remote-operated situation, also can suppress oil temperature and rise.
That is, according to above-mentioned control cock 3, it is stacked mutually that a plurality of transfer valves 40, flow-controlling gate 5, unloading overflow valve 27,29 and being used to obtains the reducing valve 47 and the back pressure valve 46 of pilot oil, constitutes stacked control cock, therefore can save the space, improves assembleability.
And, according to this control cock 3, on the pipeline between a plurality of transfer valves 40 and main oil pressure pump 7 and the secondary oil pressure pump 8, respectively plug-in mounting two unloading overflow valves 29,27, therefore, by making 29,27 actions of two unloading overflow valves, can make pressure oil not turn back to fuel tank 9 by transfer valve 40 from each pump 7,8, for example can in case of emergency promptly stop hoisting crane.
In addition, according to this control cock 3, because a plurality of transfer valves 40 adopt indirect type of drive, and therefore reducing valve 47 and back pressure valve 46 with the pilot oil that is used to obtain this transfer valve 40 can carry out for example in case of emergency promptly stopping the operation of hoisting crane by remote operation (controlled in wireless operation).And, because these reducing valves 47 and back pressure valve 46 are only obtained necessary pilot oil from main oil pressure pump 7, therefore, for example with in main oil pressure pump 7 and pipeline after secondary oil pressure pump 8 converges, reducing valve 47 is set and compares with the situation of back pressure valve 46, can suppress the oil temperature and rise.
The 2nd embodiment of the pressurized-oil supply amount control device of crane truck of the present invention then, is described.In addition, in the following description, label and the suitably omission explanation identical to the structure mark identical with above-mentioned the 1st embodiment, and different structures is elaborated.
In the 2nd embodiment, show and in the ROM of controller 2, store the example of a plurality of control functions as the table data.On the other hand, input device 1 has the selection switch (not shown) that is used to select these a plurality of control functions.And, can select this a plurality of control functions separately according to operation signal based on the operation of selecting the usefulness switch from aforesaid operations input media 1, can be in the predetermined pressurized-oil supply amount control and treatment that controller 2 is carried out with reference to the control function of the expectation of selecting.That is, can by with the cooresponding pressurized-oil supply amount control and treatment of the control function of the expectation of selecting, according to the operation signal of input device 1, set the control signal of slave controller 2 separately to throttle cylinder 4 and flow-controlling gate 5 outputs.
At length say, in the presumptive area of the ROM of the controller 2 of the 2nd embodiment, as above-mentioned a plurality of control functions, storing the 1st control function and these two control functions of the 2nd control function in the mode of the suitable reference of form of the operation result that needs in the calculating process that can derive the pressurized-oil supply amount control and treatment.Can select this a plurality of control functions according to the operation that the operator carries out with switch by the selection in the input device 1, and can suitably select this a plurality of control functions according to the engine characteristics of vehicle.
And, each control function is set at, the total delivery flow of main oil pressure pump 7 and secondary oil pressure pump 8 is changed pro rata with respect to importing cooresponding operation signal with the operation of hoisting crane.For the 1st control function and the 2nd control function, the control balance of throttle cylinder 4 and flow-controlling gate 5 is different.Below, the 1st control function and the 2nd control function are described in detail.
Fig. 4 is the figure of the 1st control function that control setup adopted (the 1st control mapping of adopting in the pressurized-oil supply amount control and treatment) of explanation the 2nd embodiment.
In the curve shown in this figure, the curve of below is represented can be used as above-mentioned table data and is carried out the 1st control function of reference (control mapping), above the curve below, the total pump driving torque when showing engine speed, rated pressure successively and the total flow of master/secondary oil pressure pump.In addition, the numerical value of the curve shown in this figure is the numerical value under the following situation: the volume of main oil pressure pump 7 and secondary oil pressure pump 8 all is made as 30cm 3/ rev is made as 400rpm with the idling speed of driving engine, and rated speed of rotation is made as 1000rpm, and the reduction ratio of driving engine and pump is made as 1 (engine speed=revolution speed), and rated pressure is made as 20MPa.
As shown in the drawing, under the situation that adopts the 1st control function, in above-mentioned pressurized-oil supply amount control and treatment, be set at, when the ratio of operation signal input was 25%, throttle cylinder stroke was 60%, flow-controlling gate 5 beginning openings.In addition, less than 25% o'clock, only the Pressure oil feeder of in the future autonomous oil pressure pump 7 was to control cock 3 in the ratio of operation signal input.And then surpassing at 25% o'clock in the ratio of operation signal input, flow-controlling gate 5 beginning openings converge the pressure oil from secondary oil pressure pump 8.Then, after the pressure oil from secondary oil pressure pump 8 converges, also produce load on secondary oil pressure pump 8, the driving torque of pump increases, and the torque load of driving engine 6 increases.
Here, the ratio that the condition of hypothesis comes the calculating operation signal to import before utilizing is 25% o'clock a engine speed, and at this moment, engine speed is the rotating speed of 60% between idling speed 400rpm and the rated speed of rotation 1000rpm, that is, and and 760rpm.That is, for for the pressurized-oil supply amount control and treatment of the 1st control function, when engine speed during more than or equal to 760rpm, begin to converge from the pressure oil of secondary oil pressure pump 8, the torque load of driving engine 6 increases.In addition, Ci Shi pump driving torque is for driving the torque of main oil pressure pump 7 and secondary oil pressure pump 8.This torque changes the torque when its maxim is rated pressure 20MPa according to discharge pressure is different.That is, at the condition (rated pressure P=20MPa, the pump volume q=30cm that utilize hypothesis 3/ rev+30cm 3/ rev=60cm 3/ when rev) calculating, be 191Nm.Therefore, under the situation that adopts the 1st control function, need driving engine below engine speed 760rpm, to produce the torque of 191Nm.
But, thereby can produce for the vehicle of torque of 191Nm with lower engine speed greatly for the output of driving engine, if adopt the 1st control function, then can make engine speed rise to the rotating speed that is higher than requirement.
Therefore, in the control setup of the 2nd embodiment, also have the 2nd control function that converges that begins secondary oil pressure pump 8 with lower engine speed, can select according to the vehicle motor characteristic.
Fig. 5 shows the 2nd control function (control mapping).In addition, in the 2nd control function, assumed conditions such as pump volume, engine speed are identical with above-mentioned the 1st control function shown in Figure 4.
As shown in Figure 5, under the situation of carrying out based on the pressurized-oil supply amount control and treatment of the 2nd control function, be set at: when the ratio of operation signal input was 10%, throttle cylinder stroke was 25%, flow-controlling gate 5 beginning openings.And, in the 2nd control function, with above-mentioned the 1st control function similarly during the calculation engine rotating speed, the ratio of operation signal input is that 10% o'clock engine speed is 550rpm, when engine speed during, begin to converge from the pressure oil of secondary oil pressure pump 8 more than or equal to 550rpm.Therefore, when adopting the 2nd control function, need driving engine below engine speed 550rpm, to produce the torque of 191Nm.
Here, the curve of comparison diagram 4 and Fig. 5, for the 1st with the 2nd control function for the pump volume of driving engine identical with rated speed of rotation, therefore the total flow that input is supplied with according to operation signal is identical.But, for the 2nd control function shown in Figure 5, owing to be to begin to carry out therefore to compare, can in the zone line of operation signal, suppress engine speed lower with the 1st control function shown in Figure 4 from the converging of the pressure oil of secondary oil pressure pump 8 in period more early.That is, for example, then adopt based on the pressurized-oil supply amount control and treatment of the 2nd control function and can carry out crane job with lower engine speed if under engine speed 500rpm, produce the driving engine of the torque of 191Nm.
Here, that the above-mentioned the 1st and the 2nd control function corresponds respectively to is above-mentioned " relation between the pressure oil predetermined amount of flow that realizes at the operation input of hoisting crane and engine speed and flow-controlling gate ", in addition, the control function of suitably selecting according to the vehicle motor characteristic in above-mentioned a plurality of control function is corresponding to above-mentioned " expected relationship in a plurality of relations of described setting ".
As mentioned above, in the control setup of the 2nd embodiment, controller 2 is set different a plurality of control functions (the 1st and the 2nd control function) as the table data, in the pressurized-oil supply amount control and treatment that this controller 2 is carried out, can select desired control function in these a plurality of control functions by input device 1, therefore, can select suitable control function according to the engine characteristics of the vehicle of toter, can be to engine speed and be used to control from the flow-controlling gate 5 of the pressure oil flow of secondary oil pressure pump 8 and carry out more suitable control.Therefore, for example under the situation of the vehicle of the torque that is applied to produce the pressure oil that can drive main oil pressure pump 7 and secondary oil pressure pump 8 simultaneously and discharge rated pressure with lower engine speed, can be than more energy-conservation and noise is lower in the past.
The 3rd embodiment of the pressurized-oil supply amount control device of crane truck of the present invention then, is described.In addition, in the following description, label and the suitably omission explanation identical to the structure mark identical with above-mentioned the 1st embodiment, and different structures is elaborated.
The crane truck of the 3rd embodiment has and can come radio operation device 60 that hoisting crane is operated by remote operation (controlled in wireless operation).This radio operation device 60 can and above-mentioned controller 2 between receive and dispatch necessary signal such as operation signal by known wireless communication means.Below, suitably this radio operation device 60 is described with reference to Fig. 6.In addition, Fig. 6 (a) is the block diagram of radio operation device, and Fig. 6 (b) is a lateral plan.
As shown in the drawing, this radio operation device 60 has handle part 67 and operating portion 68.
On operating portion 68, dispose arm direction switch 61, capstan winch (winch) switch 62, hoisting arm expansion switch 63 and left and right sides pole changer 64 etc. respectively, each switch can be respectively sends to controller 2 that (the cooresponding operation signal of the label D of Fig. 1～S), these transfer valves 40 are used for driving respectively cooresponding each actuator with transfer valve 40.In addition, on operating portion 68, also dispose the inching button 66 of the fine motion operation that is used to carry out hoisting crane, can send cooresponding operation signal to controller 2.In addition, at the lower surface of operating portion 68, be extruded with speed bar 65 downwards.Shown in Fig. 6 (b), this speed bar 65 is the ratiometric speed controllers that can regulate the operation signal of hoisting crane in 0～100% scope, can send cooresponding operation signal to controller 2 according to the size of the tractive of speed bar 65 operation, and then regulate the responsiveness of hoisting crane.
Here, above-mentioned controller 2 is carried out the pressurized-oil supply amount control and treatment, that is: according to the load signal from overload prevention apparatus 10 input, flow-controlling gate 5 is controlled, the flow of the pressure oil of discharging from secondary oil pressure pump 8 when making the load signal of this input big is lower than load signal flow hour; And based on from the operation signal of input device 1 or radio operation device 60 (below be also referred to as input device 1 etc.) input, coming dominant discharge control cock 5 according to operator's operation.In addition, the proportional-type that can suitably limit the maximum actuation amount of its guiding valve according to load signal has been adopted in above-mentioned flow-controlling gate 5, by the maximum actuation amount of restriction guiding valve, can regulate pro rata from the flow of the pressure oil of secondary oil pressure pump 8 discharges.
The controller 2 of the 3rd embodiment is in the presumptive area of ROM, can store the program of carrying out the pressurized-oil supply amount control and treatment in the mode of the suitable reference of form that can derive the required operation result of calculating process.In addition, in ROM, store the expectant control function, as the table data.And, can be in the pressurized-oil supply amount control and treatment that controller 2 is carried out with reference to this expectant control function.Promptly, in the pressurized-oil supply amount control and treatment that controller 2 is carried out, according to from input such as the operation signal of input device 1 grade with from the load signal of overload prevention apparatus 10 inputs, according to above-mentioned expectant control function, set control signal independently to throttle cylinder 4 and flow-controlling gate 5 outputs.
Below, illustrate that in further detail the predetermined control function of the 3rd embodiment reaches pressurized-oil supply amount control and treatment cooresponding with it.In addition, Fig. 7 is the figure of the predetermined control function that control setup adopted (the control mapping of adopting in the pressurized-oil supply amount control and treatment) of explanation the 3rd embodiment.
This curve that illustrates is represented can be used as above-mentioned table data and is carried out the control function of reference (control mapping), the curve of below is represented the aperture of the guiding valve of flow-controlling gate 5, above the curve below, the total flow of total pump driving torque when showing engine speed, rated pressure successively and master/secondary oil pressure pump 7,8.The volume of main oil pressure pump 7 is 20cm 3/ rev, the volume of secondary oil pressure pump 8 are 40cm 3/ rev, the numerical value of the curve shown in this figure is the numerical value under the following situation: just the idling speed of driving engine is made as 400rpm, rated speed of rotation is made as 1000rpm, the reduction ratio of driving engine and pump is made as 1 (engine speed=revolution speed), rated pressure is made as 20MPa.
Here, as mentioned above, the discharge rate of main oil pressure pump 7 is less than the discharge rate of secondary oil pressure pump 8, and especially, the discharge rate of main oil pressure pump 7 is set to the interior less discharge rate of scope of the fine motion operation of enough carrying out hoisting crane in the present embodiment.
And the pressurized-oil supply amount control and treatment in this controller 2 has been set 4 scopes according to the load signal of being imported.Particularly, the load signal when input is set at the 1st scope during less than 50% (the 1st predetermined value); When the load signal of input surpasses 50% (the 1st predetermined value) and is set at the 2nd scope during less than 95% (the 2nd predetermined value); Following any one situation is set at the 3rd scope, that is: the load signal of input surpasses 95% (the 2nd predetermined value) and less than 100% (the 3rd predetermined value), and operation inching button 66 and imported this signal; When surpassing 100% (the 3rd predetermined value), the load signal of input is set at the 4th scope.
Fig. 8 is by the controller of the 3rd embodiment diagram of circuit 2 execution, that carry out the program of pressurized-oil supply amount control and treatment.As shown in the drawing, in the example of present embodiment, when in controller 2, carrying out this program, at first transfer to step S1.
In step S1, judge the inching button 66 of whether having operated radio operation device 60, ("Yes") transfers to step S6 when having carried out operation, and ("No") transfers to step S2 when operating.In step S2, judge from the load signal of overload prevention apparatus 10 inputs whether in above-mentioned the 1st scope, if in the 1st scope ("Yes"), then transfer to step S3, if not in the 1st scope ("No") then transfers to step S4.
In step S3, carry out a series of processing that only comes dominant discharge control cock 5 according to operation signal, return then.Particularly, Ci Shi control be according to based on Fig. 8 predefined function formula (basic function formula) K of curve shown in the below carry out.In addition, the 1st scope for example is set to the scope that can not cause hoisting crane to be toppled over.
In step S4, judge load signal whether in above-mentioned the 2nd scope, if in the 2nd scope ("Yes") then transfer to step S5, if not in the 2nd scope ("No") then transfer to step S6.
In step S5, carry out following a series of processing: dominant discharge control cock 5, the flow that makes the pressure oil of discharging from secondary oil pressure pump 8 reduces greatly with the change of input load signal; And come dominant discharge control cock 5 according to operation signal, return then.Particularly, being controlled to be of this moment: K multiply by the inverse of rate of load condensate to above-mentioned predefined function formula (basic function formula), therefore the load signal of being imported is big more, the slope of predefined function formula K shown in Figure 7 is more little, functional expression according to this slope reduces comes dominant discharge control cock 5 according to operation signal at this moment.
In step S6, judge load signal whether in above-mentioned the 3rd scope, if in the 3rd scope ("Yes") then transfer to step S8, if not in the 3rd scope ("No") then transfer to step S7.
In step S8, carry out a series of processing that flow-controlling gate 5 is closed fully, return then.Flow-controlling gate 5 is not moved.In addition, in step S7, judge load signal whether in above-mentioned the 4th scope, if in the 4th scope ("Yes") then transfer to step S9, if not in the 4th scope ("No") then transfer to step S8.In step S9, execution comprises the interior a series of processing that are controlled at that make above-mentioned unloading overflow valve 27,29 actions, returns then.Thus, make and press oil to turn back to fuel tank 9 sides, stop the action of hoisting crane without each transfer valve 40.
Here, more specific description is carried out in flow control based on the flow-controlling gate 5 of aforesaid operations signal: the forwarder (differential transformer) that in each transfer valve 40 of above-mentioned control cock 3, is provided with the actuating quantity that to grasp its guiding valve, calculate the needed total flow of hoisting crane according to these actuating quantities, according to this needed total flow that calculates, the guiding valve maximum actuation amount that computing flow-controlling gate 5 is required.
Effect/the effect of the pressurized-oil supply amount control device of the 3rd embodiment then, is described.
Pressurized-oil supply amount control device according to the 3rd embodiment, in this controller 2, input is with the cooresponding load signal of crane load rate with at the operation signal of hoisting crane respectively, therefore control a flow-controlling gate 5 according to these load signals and operation signal, can utilize this flow-controlling gate 5 to be used for to converge the flow control of pressing oil and control with the rate of load condensate corresponding flow.
And, according to this controller 2, make in above-mentioned load signal and the operation signal and preferentially come dominant discharge control cock 5 with cooresponding load signal one side of crane load rate, therefore can make flow become the state of expectation reliably according to the rate of load condensate of hoisting crane.
And, according to this controller 2, set 4 scopes according to the rate of load condensate of hoisting crane, therefore more help being controlled to be and the cooresponding expectation state of crane load rate.
That is, in the 1st lower scope of rate of load condensate (load signal of input is less than 50%), do not change above-mentioned predefined function formula (basic function formula) K, only come dominant discharge control cock 5, therefore can carry out sensitive operation according to operation signal at hoisting crane.
And, in rate of load condensate is moderate the 2nd scope (load signal of input is more than or equal to 50% and less than 95%), dominant discharge control cock 5, the flow that makes the pressure oil of discharging from secondary oil pressure pump 8 reduces greatly with the change of load signal.Promptly, predefined function formula K be multiply by the inverse of rate of load condensate, reduce the slope of predefined function formula K, the functional expression that reduces according to this slope, operation signal according to this moment comes dominant discharge control cock 5, therefore can with the corresponding speed of the level of this rate of load condensate under carry out stable crane operation.
In addition, in the 3rd scope of rate of load condensate higher (load signal of input is more than or equal to 95% and less than 100%), the control that flow-controlling gate 5 is closed fully.Therefore, only supply with to the transfer valve 40 of control cock 3 and press oil this moment by the pressure oil of discharging from main oil pressure pump 7.And then, in the 4th scope (load signal of input is more than or equal to 100%) that rate of load condensate oversteps the extreme limit, make unloading overflow valve 27,29 actions, make and press oil to turn back to fuel tank 9 sides, stop the action of hoisting crane, therefore the crane operation that can stop this moment reliably.
In addition, when the fine motion operation of walking crane, implemented to close fully the control of flow-controlling gate 5.Therefore, only supply with to the transfer valve 40 of control cock 3 by the pressure oil of discharging from main oil pressure pump 7 and press oil this moment, therefore can be simply, low cost ground structure dead slow speed moving system.
Therefore, according to this pressurized-oil supply amount control device, generally operability is good, and can carry out will being controlled to be the crane operation of expectation state with the rate of load condensate corresponding flow reliably.And can be simply, low cost ground makes up the dead slow speed moving system.
In addition, the pressurized-oil supply amount control device of crane truck of the present invention is not limited to the respective embodiments described above, obviously only otherwise breaking away from purport of the present invention can carry out various distortion.
For example, in above-mentioned the 1st embodiment, the volume that main oil pressure pump 7 and secondary oil pressure pump 8 have been described all is 30cm 3The example of/rev, but be not limited thereto, for example, also the maximum throughput of main oil pressure pump can be set at littler than the maximum throughput of secondary oil pressure pump.That this structure more helps is low at engine speed, the torque load of torque hour inhibition driving engine.And in this case, for example, preferably the maximum throughput of main oil pressure pump is set at and carries out the required enough discharge rates of micromotion.That this structure more helps is low at engine speed, the torque load of torque hour inhibition driving engine.
In addition, for example in above-mentioned the 2nd embodiment, the example of the control function that can expect from a plurality of control functions of input device 1 selection has been described, but be not limited thereto, for example also can adopt this structure: toggle switch (dip switch) is set on the substrate of controller 2, and when dispatching from the factory, pass through to set this toggle switch, set the control function that is suitable for cooresponding engine characteristics most, as the control function of above-mentioned expectation.
In addition, in above-mentioned the 2nd embodiment, illustrated that selectable a plurality of different control functions are two kinds example in the pressurized-oil supply amount control and treatment that controller 2 is carried out, but be not limited thereto, also can adopt the structure of from the control function more than 3 kinds for example, selecting.
In addition, for example in above-mentioned the 3rd embodiment, such example has been described, that is: the control of the pressurized-oil supply amount control and treatment of carrying out by controller 2 when the dead slow speed moving system is corresponding to operation inching button 66 and incoming signal, but be not limited thereto, but for example also can be on the signal wire (SW) of connection traffic control cock 5 and controller 2 switch of plug-in mounting on/off, and, constitute the dead slow speed moving system by this switch is operated.Even adopt this structure, also can be simply, low cost ground makes up the dead slow speed moving system.

Claims (6)

1. the pressurized-oil supply amount control device of a crane truck, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from described secondary oil pressure pump is the flow-controlling gate of expectation flow, and can be according to control the rotating speed of described driving engine and the controller of described flow-controlling gate at the operation signal input of described hoisting crane, this pressurized-oil supply amount control device makes the pressure oil of the described secondary oil pressure pump after the described flow control valve regulation converge with the pressure oil of discharging from described main oil pressure pump, it is supplied to the control cock that is used to drive described hoisting crane, it is characterized in that
Described controller has: the motor speed control unit, and it controls the rotating speed of described driving engine; And the delivery flow control unit, it is controlled from the flow of the pressure oil of described flow-controlling gate discharge,
Described delivery flow control unit comprises following flow control: the 1st flow control: described flow-controlling gate is closed fully, only with the Pressure oil feeder of described main oil pressure pump to described control cock; The 2nd flow control: the pressure oil of described secondary oil pressure pump is converged with the pressure oil of discharging from described main oil pressure pump, the discharge rate of the pressure oil after converging is changed according to the ratio of described operation signal input proportionally, the Pressure oil feeder after will converging is to described control cock; And the 3rd flow control: described flow-controlling gate is opened fully, supply with the pressure oil of the maximum that can discharge from described main oil pressure pump and secondary oil pressure pump to described control cock,
Described motor speed control unit comprises following rotating speed control: the control of the 1st rotating speed: the rotating speed of described driving engine is changed according to the ratio of described operation signal input proportionally, rise to the torque deficiency that described driving engine can not occur and produce the 2nd engine speed of enough torques from idling speed; The 2nd rotating speed control: make the rotating speed of described driving engine remain on described the 2nd engine speed; And the 3rd rotating speed control: make the ratio of the rotating speed of described driving engine, rise to than its 3rd higher engine speed from described the 2nd engine speed pro rata according to described operation signal input,
Described controller is carried out following control: when the ratio of described operation signal input is in less than the 1st ratiometric the 1st zone, carries out described the 1st rotating speed control and correspondingly carry out described the 1st flow control; When the ratio of described operation signal input is in more than or equal to the 1st ratio and less than than big the 2nd ratiometric the 2nd zone of the 1st ratio the time, carry out described the 2nd rotating speed control and correspondingly carry out described the 2nd flow control; When the ratio of described operation signal input is in more than or equal to the 2nd ratiometric the 3rd zone, carries out described the 3rd rotating speed control and correspondingly carry out described the 3rd flow control.
2. the pressurized-oil supply amount control device of crane truck according to claim 1 is characterized in that,
Described controller is by the cooperation of described motor speed control unit and described delivery flow control unit, and the total flow that makes the pressure oil of supplying with to described control cock according to the ratio of described operation signal input, rises in whole zone pro rata.
3. the pressurized-oil supply amount control device of a crane truck, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from this pair oil pressure pump is the flow-controlling gate of predetermined amount of flow, and according to controlling the rotating speed of described driving engine and the controller of described flow-controlling gate respectively individually at the operation of described hoisting crane input, this pressurized-oil supply amount control device makes the pressure oil after the described flow control valve regulation converge with the pressure oil of discharging from described main oil pressure pump, it is supplied to the control cock that is used to drive described hoisting crane, it is characterized in that
In described controller, a plurality of relations have been set, described relation is: the relation between the oily predetermined amount of flow of pressure that realizes at the rotating speed and the described flow-controlling gate of the operation of described hoisting crane input and described driving engine, and, can select expected relationship in a plurality of relations of described setting, according at the operation input of described hoisting crane and the desired relationship of described selection, control the rotating speed of described driving engine and the pressure oil predetermined amount of flow of described flow-controlling gate realization separately.
4. according to the pressurized-oil supply amount control device of any described crane truck in the claim 1～3, it is characterized in that,
Described control cock is stacked control cock, and the green phase alternating layers are folded following each valve and formed stacked structure, and described each valve is: a plurality of transfer valves of indirect type of drive, and it is used to drive each actuator of described hoisting crane; Flow-controlling gate, it is regulated from the flow of the pressure oil of described secondary oil pressure pump discharge, and itself and the pressure oil of discharging from described main oil pressure pump are converged, and carries to described a plurality of transfer valves; Two unloading overflow valves, it is inserted into respectively between described a plurality of transfer valve and described main oil pressure pump and the described secondary oil pressure pump; Reducing valve and back pressure valve, it is only obtained from described main oil pressure pump and drives the required pilot oil of described a plurality of transfer valves.
5. the pressurized-oil supply amount control device of a crane truck, it is used to control the delivery volume of the pressure oil of supplying with to the hoisting crane that is loaded on the vehicle, this pressurized-oil supply amount control device has: the main oil pressure pump and the secondary oil pressure pump that are driven simultaneously by the driving engine of described vehicle, the flow regulating of the pressure oil that will discharge from described secondary oil pressure pump is the flow-controlling gate of expectation flow, can with the pressure oil bypass of discharging from described main oil pressure pump and secondary oil pressure pump to the main oil pressure pump of fuel tank with unloader valve and secondary oil pressure pump unloader valve, and can be according to control the rotating speed of described driving engine and the controller of described flow-controlling gate at the operation signal of described hoisting crane, this pressurized-oil supply amount control device makes the pressure oil of the described secondary oil pressure pump after the described flow control valve regulation converge with the pressure oil of discharging from described main oil pressure pump, and it is supplied to each transfer valve that is used to drive described hoisting crane, it is characterized in that
Except to the operation signal of described controller input at described hoisting crane, also to the rate of load condensate cooresponding load signal of its input with described hoisting crane,
Described controller constitutes: control described flow-controlling gate according to the operation signal of described input, and, control described flow-controlling gate according to the load signal of described input, the flow of the pressure oil of discharging from described secondary oil pressure pump when making the load signal of this input big is lower than load signal flow hour, perhaps makes described each unloader valve action.
6. the pressurized-oil supply amount control device of crane truck according to claim 5 is characterized in that,
When the load signal of described input is in the 1st scope less than the 1st predetermined value, only according to controlling described flow-controlling gate at the operation signal of described hoisting crane,
Be at the load signal of described input and surpass described the 1st predetermined value and during less than the 2nd scope of the 2nd predetermined value bigger than the 1st predetermined value, control described flow-controlling gate, make the flow of the pressure oil of discharging from described secondary oil pressure pump reduce greatly with the change of described load signal, and, control described flow-controlling gate according to described operation signal
Be at the load signal of described input and surpass described the 2nd predetermined value and during less than the 3rd scope of 3rd predetermined value bigger, to close the control of described flow-controlling gate fully than the 2nd predetermined value,
When the load signal of described input is in the 4th scope that surpasses described the 3rd predetermined value, make described each unloader valve action, make pressure oil bypass from main oil pressure pump and secondary oil pressure pump to fuel tank.
CN2007800417183A 2006-11-09 2007-10-19 Pressurized-oil supply amount control device for vehicle-mounted crane Active CN101535168B (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2006303660A JP5248005B2 (en) 2006-11-09 2006-11-09 Stack type control valve for on-board crane
JP303660/2006 2006-11-09
JP2006324506A JP5032102B2 (en) 2006-11-30 2006-11-30 Pressure oil supply control device for on-board crane
JP324506/2006 2006-11-30
JP2006345394A JP5248011B2 (en) 2006-12-22 2006-12-22 Pressure oil supply control device for on-board crane
JP345394/2006 2006-12-22
PCT/JP2007/070434 WO2008056526A1 (en) 2006-11-09 2007-10-19 Pressurized-oil supply amount control device for vehicle-mounted crane

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CN111943095A (en) * 2020-07-10 2020-11-17 湖南星邦智能装备股份有限公司 Method for controlling stability of boom of aerial work platform

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CN108715411A (en) * 2018-08-03 2018-10-30 中船绿洲镇江船舶辅机有限公司 A kind of ship's crane hydraulic emergency stop unit

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JPS6073901U (en) * 1984-06-21 1985-05-24 株式会社ナブコ Pilot operated switching valve
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CN111943095A (en) * 2020-07-10 2020-11-17 湖南星邦智能装备股份有限公司 Method for controlling stability of boom of aerial work platform
CN111943095B (en) * 2020-07-10 2021-10-01 湖南星邦智能装备股份有限公司 Method for controlling stability of boom of aerial work platform

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