CN104386584A - Power control method and power control system for hoisting equipment - Google Patents
Power control method and power control system for hoisting equipment Download PDFInfo
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- CN104386584A CN104386584A CN201410471960.6A CN201410471960A CN104386584A CN 104386584 A CN104386584 A CN 104386584A CN 201410471960 A CN201410471960 A CN 201410471960A CN 104386584 A CN104386584 A CN 104386584A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
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- Automation & Control Theory (AREA)
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- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a power control method for hoisting equipment. The method comprises the steps of: 1) detecting the current loading pressure of the hoisting equipment's power system, converting the current loading pressure into an electrical signal, and directly conveying the signal to ECU of an engine through a circuit; and 2) according to the electrical signal, outputting an engine speed matching with the current loading pressure. According to the method, the current loading pressure is transferred the engine ECU in the form of the electric signal, the mode and time for transferring an external load signal to the engine are changed, the time required for signal transmission is reduced, and the engine can rapidly response in advance. Thus, flameout caused by too much sudden fall of the engine speed can be avoided when the pressure load suddenly increases, thus effectively improving the power adaptability of engine under a low speed condition. The invention also discloses a power control system for hoisting equipment.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of power-control method of weight-lifting equipment, power control system.
Background technology
The power system of weight-lifting equipment generally includes engine installation and hydraulic efficiency pressure system, and wherein engine installation comprises driving engine, change speed gear box and power takeoff, and hydraulic efficiency pressure system comprises Hydraulic Pump, hydraulic valve and HM Hydraulic Motor.
In working process, the driving engine in engine installation provides original power, and power takeoff, change speed gear box are by the transmission of power of driving engine to Hydraulic Pump, and Hydraulic Pump provides hydraulic power.When operating personal operation hydraulic handle sends lifting order, first the opening amount signal of handle is passed to hydraulic valve, the hydraulic fluid flow rate that hydraulic valve provides according to opening amount signal distribution Hydraulic Pump, hydraulic oil CD-ROM drive motor is rotated, realizes the lifting of weight.
When heavy lift, the load transients produced increases, the rising of HM Hydraulic Motor pressure can be converted into, because the output torque of HM Hydraulic Motor and discharge capacity V, pressure P are proportional, fixed displacement motor discharge capacity is constant, pressure, with extraneous load variations, therefore drives that the demand torque of HM Hydraulic Motor increases, rotating speed declines.In like manner, the Hydraulic Pump of motor operations, driving engine is driven to need the moment of torsion exported also with extraneous load variations.
In prior art, the problem adopting following power-control method to solve above-mentioned load to uprush:
First, detect pressure signal and the rotation speed change of HM Hydraulic Motor, be passed to Hydraulic Pump by hydraulic tubing, hydraulic valve;
Again the rotating speed of Hydraulic Pump is descended through power takeoff, change speed gear box passes to driving engine;
Then the tachogen be located on driving engine captures rotation speed change and passes to ECU;
Final ECU demarcates according to program and makes reactions such as increasing fuel charge, impels the rotating speed of driving engine to go up, thus drives the increase of HM Hydraulic Motor output torque, rotating speed rise.
But, because the rotating speed of now driving engine declines, the actual suction quantity of driving engine also reduces thereupon, increase although ECU controls fuel charge, but only have 1-2s from the driving engine fire of being dinched that drops to suddenly of rotating speed, this deficiency of time is made with control program and is responded and make rotating speed go up, unless the reserve torque of driving engine own is larger, this load can be born uprush, the reaction time could be won to ECU.Therefore, if there is larger peak value in extraneous load variations, driving engine usually can be caused to adapt to and to stop working, impact normally works.
In view of this, urgently for above-mentioned technical matters, design is optimized to the power-control method of weight-lifting equipment in prior art, to make engine speed rapid reaction, export the power needed for present load pressure and moment of torsion, thus improve the power comformability of driving engine under speed operation.
Summary of the invention
Object of the present invention is for providing a kind of power-control method of weight-lifting equipment, and the method is delivered to mode and the time of driving engine by changing extraneous load signal, make driving engine rapid reaction, effectively improve the power comformability of driving engine at speed operation.In addition, another object of the present invention is for providing a kind of power control system of weight-lifting equipment.
For solving the problems of the technologies described above, the invention provides a kind of power-control method of weight-lifting equipment, comprising the steps:
1) detect the present load pressure of the power system of described weight-lifting equipment, described present load pressure is converted into electric signal, and is directly delivered to the ECU of driving engine by circuit;
2) engine speed with described present load pressure match is exported according to described electric signal.
Preferably, described power system comprises HM Hydraulic Motor, described step 1) detect the delivery pressure of described HM Hydraulic Motor, and described delivery pressure is determined described present load pressure.
Preferably, described HM Hydraulic Motor has the first hydraulic fluid port, the second hydraulic fluid port, the two switches mutually respectively as oil inlet, oil outlet, described step 1) detect the first load pressure of described first hydraulic fluid port, the second load pressure of described second hydraulic fluid port respectively, and more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
Preferably, described step 2) be specially:
21) according to the more described present load pressure of described electric signal and preset high-pressure, pre-set low pressure; If described present load pressure is greater than described preset high-pressure, perform step 22); If described present load pressure is less than described pre-set low pressure, perform step 23); If described present load pressure is between described preset high-pressure, described pre-set low pressure, perform step 24);
22) by the current adjustment of rotational speed of described driving engine to high-speed operation;
23) by the current adjustment of rotational speed of described driving engine to tickover;
24) keep current state constant.
Preferably, described preset high-pressure is less than the critical pressure making described engine off when described engine idling operation.
Preferably, described step 21) judge that described present load pressure is greater than described preset high-pressure after, perform step 22) before, also comprise: 221) judge that described present load pressure is in this scope and whether continues the first Preset Time, if so, described step 22 is performed); If not, described step 24 is performed);
Described step 21) judge described present load pressure be less than described pre-set low pressure after, perform step 23) before, also comprise: 231) judge that described present load pressure is in this scope and whether continues the second Preset Time, if so, described step 23 is performed); If not, described step 24 is performed).
Adopt in this way, by the form of electric signal, present load pressure is passed to the ECU of driving engine, change mode and time that extraneous load signal is delivered to driving engine, with in prior art by compared with the mode of reacting transmission of signal successively of each parts of hydraulic efficiency pressure system, substantially reduce the time needed for signal transmission, make driving engine can rapid reaction.Therefore when pressure load increases suddenly, make driving engine can promote rotating speed in advance in a short period of time, avoid rotating speed decline suddenly too much and cause being dinched fire, effectively improve the power comformability of driving engine under speed operation.
The present invention also provides a kind of power control system of weight-lifting equipment, comprising:
Detection part, for detecting the present load pressure of the power system of described weight-lifting equipment, is converted into electric signal by described present load pressure;
Control unit, is connected with described detection part circuit, for receiving described electric signal, and exports the engine speed with described present load pressure match according to described electric signal;
Execution unit, is connected with described control unit signal, for accepting and exporting the control command of described control unit.
Preferably, described power system comprises HM Hydraulic Motor, and described detection part is be located at the pressure sensor in described HM Hydraulic Motor, described control unit also for the delivery pressure of HM Hydraulic Motor that described pressure sensor is detected as described present load pressure.
Preferably, described HM Hydraulic Motor has the first hydraulic fluid port, the second hydraulic fluid port, the two switches mutually respectively as oil inlet, oil outlet, described pressure sensor comprises to be located at described first hydraulic fluid port, for detecting the first pressure sensor of the first load pressure, and to be located at described second hydraulic fluid port, for detecting the second pressure sensor of the second load pressure;
Described control unit also for more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
Preferably, described control unit is also for according to the more described present load pressure of described electric signal and preset high-pressure, pre-set low pressure;
And when described present load pressure is greater than described preset high-pressure, send the current adjustment of rotational speed of described driving engine to the first control command of high-speed operation; When described present load pressure is less than described pre-set low pressure, send the current adjustment of rotational speed of described driving engine to the second control command of tickover; When described present load pressure is between described preset high-pressure, described pre-set low pressure, send the 3rd control command keeping current state constant.
Preferably, described preset high-pressure is less than the critical pressure making described engine off when described engine idling operation.
Preferably, described control unit also for: judge described present load pressure be greater than described preset high-pressure after, send described first control command before, also continue to judge that described present load pressure is in this scope and whether continues the first Preset Time, if, send described first control command, if not, described 3rd control command is sent;
And judge described present load pressure be less than described pre-set low pressure after, send described second control command before, also continue to judge that described present load pressure is in this scope whether lasting second Preset Time, if so, send described second control command; If not, described 3rd control command is sent.
Power-control method due to above-mentioned weight-lifting equipment has as above technique effect, and therefore, the power control unit of weight-lifting equipment corresponding with it also should have identical technique effect, does not repeat them here.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of a kind of detailed description of the invention of the power-control method of weight-lifting equipment provided by the present invention;
Fig. 2 is the FB(flow block) of the another kind of detailed description of the invention of power-control method provided by the present invention;
Fig. 3 is the FB(flow block) of another detailed description of the invention of power-control method provided by the present invention;
Fig. 4 is the structural representation of a kind of detailed description of the invention of the power control system that the invention provides weight-lifting equipment.
Wherein, the Reference numeral in Fig. 4 and the corresponding relation between component names are:
Detection part 11; Control unit 12; Execution unit 13.
Detailed description of the invention
Core of the present invention is for providing a kind of power-control method of weight-lifting equipment, and the method is delivered to mode and the time of driving engine by changing extraneous load signal, make driving engine rapid reaction, effectively improve the power comformability of driving engine at speed operation.In addition, another core of the present invention is for providing a kind of power control system of weight-lifting equipment.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the FB(flow block) of a kind of detailed description of the invention of the power-control method of weight-lifting equipment provided by the present invention.
In a kind of detailed description of the invention, the invention provides a kind of power-control method of weight-lifting equipment, the power system of this weight-lifting equipment comprises engine installation and hydraulic efficiency pressure system, and engine installation comprises driving engine, change speed gear box and power takeoff, and hydraulic efficiency pressure system comprises Hydraulic Pump, hydraulic valve and HM Hydraulic Motor.In working process, the driving engine in engine installation provides original power, and power takeoff, change speed gear box are by the transmission of power of driving engine to Hydraulic Pump, and Hydraulic Pump provides hydraulic power.When operating personal operation hydraulic handle sends lifting order, first the opening amount signal of handle is passed to hydraulic valve, the hydraulic fluid flow rate that hydraulic valve provides according to opening amount signal distribution Hydraulic Pump, hydraulic oil CD-ROM drive motor is rotated, realizes the lifting of weight.In the process, can control with power-control method provided by the invention, the method comprises the steps:
S11: the present load pressure detecting the power system of described weight-lifting equipment, is converted into electric signal by described present load pressure, and is directly delivered to the ECU of driving engine by circuit;
Present load pressure is passed to the ECU of driving engine by this step as electronic signals fast by circuit, with in prior art by the mode of the sequence delivery load pressure signal of HM Hydraulic Motor-hydraulic valve-Hydraulic Pump to compared with, substantially increase the speed of signal transmission.
S12: export the engine speed with described present load pressure match according to described electric signal.
Adopt in this way, by the form of electric signal, present load pressure is passed to the ECU of driving engine, change mode and time that extraneous load signal is delivered to driving engine, with in prior art by compared with the mode of reacting transmission of signal successively of each parts of hydraulic efficiency pressure system, substantially reduce the time needed for signal transmission, make driving engine can rapid reaction.Therefore, when pressure load increases suddenly, make driving engine can promote rotating speed at very short time advance, avoid rotating speed decline suddenly too much and cause being dinched fire, effectively improve the power comformability of driving engine under speed operation.
In concrete scheme, above-mentioned power system comprises HM Hydraulic Motor, and described step S11 detects the delivery pressure of described HM Hydraulic Motor, and described delivery pressure is determined described present load pressure.
Due to the power element that HM Hydraulic Motor is hydraulic efficiency pressure system, the mechanical energy that its fluid pressure provided by Hydraulic Pump can change its output shaft into is used for lifting weight, therefore HM Hydraulic Motor can in the change of the extraneous load pressure of very first time perception, therefore, adopt this method of inspection, present load pressure can be obtained simply, exactly.
More specifically in scheme, for some HM Hydraulic Motor, it has the first hydraulic fluid port, the second hydraulic fluid port, and the two can switch respectively as oil inlet, oil outlet at any time according to the difference of hand of rotation.Step S11 in above-mentioned control method can detect the first load pressure of described first hydraulic fluid port, the second load pressure of described second hydraulic fluid port respectively, and more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
Because the oil outlet pressure of HM Hydraulic Motor is greater than inlet pressure, therefore in the first load pressure, the second load pressure, larger one just represents present load pressure.Adopt in this way, only need detect two load pressures of the first hydraulic fluid port, the second hydraulic fluid port respectively, present load pressure can be obtained again by comparing size, and without the need to judging which hydraulic fluid port of HM Hydraulic Motor is oil inlet under current working, which hydraulic fluid port is oil inlet, make testing process convenient, simple to operate.
Certainly, the method for above-mentioned acquisition present load pressure is not limited in this, also can first judge that the oil outlet of current HM Hydraulic Motor is as which hydraulic fluid port, then only detects the pressure of this hydraulic fluid port, it can be used as present load pressure according to actual condition.
In another kind of detailed description of the invention, as shown in Figure 2, Fig. 2 is the FB(flow block) of the another kind of detailed description of the invention of power-control method provided by the present invention, exports specifically comprise the steps: with the engine speed of present load pressure match in above-mentioned control method according to electric signal
S221: according to the more described present load pressure of described electric signal, preset high-pressure, pre-set low pressure; If described present load pressure is greater than described preset high-pressure, perform step S222; If described present load pressure is less than described pre-set low pressure, perform step S223; If described present load pressure is between described preset high-pressure, described pre-set low pressure, perform step S224;
S222: by the current adjustment of rotational speed of described driving engine to high-speed operation;
S223: by the current adjustment of rotational speed of described driving engine to tickover;
S224: keep current state constant.
Adopt in this way, when present load pressure is greater than preset high-pressure, just regard as present load pressure jump, namely engine idling operation can not meet the demand of present load pressure, now by the current adjustment of rotational speed of driving engine to high-speed operation, the output torque of driving engine is increased, meets the needs of lifting weight.When present load pressure is less than pre-set low pressure, namely system pressure reduces, now export a low level to the corresponding stitch of the idling lifting function of ECU, engine speed reverts to tickover, driving engine can be avoided so to be always in high rotation speed operation and cause oil consumption to increase.Due to the situation of meeting generation systems fluctuation of pressure in lifting weight process, therefore when the intermediary among a small circle of present load between pre-set low pressure, preset high-pressure beats, driving engine is made to keep current state constant in this stage, the adjustment of rotational speed that driving engine system pressure can being avoided like this to fluctuate cause is unnecessary.
From above-mentioned working process, adopt said method, the moment of torsion of demand can either be exported according to present load Stress control driving engine, the adjustment of the unnecessary engine speed that system momentary fluctuation can be avoided again to cause.
In concrete preset procedures, 70% of the maximum pressure H of security of system work during normal impact load can be set to preset high-pressure, be set to pre-set low pressure by 60% of maximum pressure H, then 60% ~ 70% of maximum pressure H form the above-mentioned intermediary.Certainly, also other numerical value can be preset as above-mentioned preset high-pressure, pre-set low pressure.
Can expect, above-mentioned output according to electric signal is not limited in this mode with the method for the engine speed of present load pressure match, also a preset pressure only can be set, when present load pressure is higher than this preset pressure, controls driving engine and make its high speed rotating; When present load pressure is lower than this preset pressure, controls driving engine and make its idle.This mode is comparatively simple, but when present load pressure is beated about preset pressure due to fluctuation, engine speed can be caused also and then to carry out unnecessary adjustment.
In another kind of detailed description of the invention, the preset high-pressure in above-mentioned control method is less than the critical pressure making described engine off when described engine idling operation.
Adopt this situation, because preset high-pressure is less than critical pressure, therefore, when in control process, present load pressure reaches preset high-pressure, driving engine just improves rotating speed, increases output torque and power, namely the control in advance of driving engine is achieved, make driving engine just improve rotating speed before flame-out, further ensure that the working stability of driving engine.Certainly, the difference of concrete preset pressure and critical pressure can set according to actual condition.
In another kind of detailed description of the invention, as shown in Figure 3, Fig. 3 is the FB(flow block) of another detailed description of the invention of power-control method provided by the present invention, after judging in described step S321 that described present load pressure is greater than described preset high-pressure, before performing step S322, also comprise step:
S3221: judge that described present load pressure is in this scope and whether continues the first Preset Time, if so, perform described step S322; As no, perform described step S324;
Judge in described step S321 described present load pressure be less than described pre-set low pressure after, perform before step S323, also comprise step:
S3231: judge that described present load pressure is in this scope and whether continues the second Preset Time, if so, perform described step S323; If not, described step S324 is performed.
Like this, if present load pressure increase is to preset high-pressure and maintain the first Preset Time, just think that pressure stability reaches preset high-pressure, avoid of short duration or the accidental fluctuation of load to be mistaken for that load pressure is stable to be increased, and then avoid the rotating speed unnecessarily promoting driving engine, further increase the accuracy of power-control method.Maintain the second preset time period when present load pressure is reduced to pre-set low pressure, just think that pressure stability is down to pre-set low pressure, instantaneous or the accidental fluctuation of load is avoided to be mistaken for load pressure steady decrease, and then avoid the rotating speed unnecessarily reducing driving engine, also ensure that the stability of power-control method equally.
Please refer to Fig. 4, Fig. 4 is the structural representation of a kind of detailed description of the invention of the power control system that the invention provides weight-lifting equipment.
In another kind of detailed description of the invention, as shown in Figure 4, the present invention also provides a kind of power control system of weight-lifting equipment, and this power control system comprises detection part, control unit and execution unit.Wherein, described present load pressure, for detecting the present load pressure of the power system of described weight-lifting equipment, is converted into electric signal by detection part.Control unit is connected with described detection part circuit, for receiving described electric signal, and exports the engine speed with described present load pressure match according to described electric signal.Execution unit is connected with described control unit signal, for accepting and exporting the control command of described control unit.
In concrete scheme, described power system comprises HM Hydraulic Motor, and described detection part is be located in described HM Hydraulic Motor, for detecting the pressure sensor of the delivery pressure of described HM Hydraulic Motor.
More specifically in scheme, described HM Hydraulic Motor has the first hydraulic fluid port, the second hydraulic fluid port, the two switches mutually respectively as oil inlet, oil outlet, described pressure sensor comprises to be located at described first hydraulic fluid port, for detecting the first pressure sensor of the first load pressure, and to be located at described second hydraulic fluid port, for detecting the second pressure sensor of the second load pressure; Described control unit also for more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
In another kind of detailed description of the invention, described control unit is also for according to the more described present load pressure of described electric signal, preset high-pressure, pre-set low pressure; And when described present load pressure is greater than described preset high-pressure, send the current adjustment of rotational speed of described driving engine to the first control command of high-speed operation; When described present load pressure is less than described pre-set low pressure, send the current adjustment of rotational speed of described driving engine to the second control command of tickover; When described present load pressure is between described preset high-pressure, described pre-set low pressure, send the 3rd control command keeping current state constant.
In concrete scheme, described preset high-pressure is less than the critical pressure making described engine off when described engine idling operation.
In another kind of detailed description of the invention, described control unit also for: judge described present load pressure be greater than described preset high-pressure after, send described first control command before, also continue to judge that described present load pressure is in this scope and whether continues the first Preset Time, if, send described first control command, if not, described 3rd control command is sent; And judge described present load pressure be less than described pre-set low pressure after, send described second control command before, also continue to judge that described present load pressure is in this scope whether lasting second Preset Time, if so, send described second control command; If not, described 3rd control command is sent.
Power-control method due to above-mentioned weight-lifting equipment has as above technique effect, and therefore, the control system corresponding with this control method also should have identical technique effect, does not repeat them here.
Above the power-control method of a kind of weight-lifting equipment provided by the present invention, power control unit are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (12)
1. a power-control method for weight-lifting equipment, is characterized in that, comprises the steps:
1) detect the present load pressure of the power system of described weight-lifting equipment, described present load pressure is converted into electric signal, and is directly delivered to the ECU of driving engine by circuit;
2) engine speed with described present load pressure match is exported according to described electric signal.
2. the power-control method of weight-lifting equipment according to claim 1, is characterized in that, described power system comprises HM Hydraulic Motor, described step 1) detect the delivery pressure of described HM Hydraulic Motor, and described delivery pressure is determined described present load pressure.
3. the power-control method of weight-lifting equipment according to claim 2, it is characterized in that, described HM Hydraulic Motor has the first hydraulic fluid port, the second hydraulic fluid port, the two switches mutually respectively as oil inlet, oil outlet, described step 1) detect the first load pressure of described first hydraulic fluid port, the second load pressure of described second hydraulic fluid port respectively, and more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
4. the power-control method of the weight-lifting equipment according to any one of claim 1-3, is characterized in that, described step 2) be specially:
21) according to the more described present load pressure of described electric signal and preset high-pressure, pre-set low pressure; If described present load pressure is greater than described preset high-pressure, perform step 22); If described present load pressure is less than described pre-set low pressure, perform step 23); If described present load pressure is between described preset high-pressure, described pre-set low pressure, perform step 24);
22) by the current adjustment of rotational speed of described driving engine to high-speed operation;
23) by the current adjustment of rotational speed of described driving engine to tickover;
24) keep current state constant.
5. the power-control method of weight-lifting equipment according to claim 4, is characterized in that, described preset high-pressure is less than the critical pressure making described engine off when described engine idling operation.
6. the power-control method of weight-lifting equipment according to claim 5, is characterized in that,
Described step 21) judge that described present load pressure is greater than described preset high-pressure after, perform step 22) before, also comprise: 221) judge that described present load pressure is in this scope and whether continues the first Preset Time, if so, perform described step 22); If not, described step 24 is performed);
Described step 21) judge described present load pressure be less than described pre-set low pressure after, perform step 23) before, also comprise: 231) judge that described present load pressure is in this scope and whether continues the second Preset Time, if so, described step 23 is performed); If not, described step 24 is performed).
7. a power control system for weight-lifting equipment, is characterized in that, comprising:
Detection part, for detecting the present load pressure of the power system of described weight-lifting equipment, is converted into electric signal by described present load pressure;
Control unit, is connected with described detection part circuit, for receiving described electric signal, and exports the engine speed with described present load pressure match according to described electric signal;
Execution unit, is connected with described control unit signal, for accepting and exporting the control command of described control unit.
8. the power control system of weight-lifting equipment according to claim 7, it is characterized in that, described power system comprises HM Hydraulic Motor, described detection part is be located at the pressure sensor in described HM Hydraulic Motor, described control unit also for the delivery pressure of HM Hydraulic Motor that described pressure sensor is detected as described present load pressure.
9. the power control system of weight-lifting equipment according to claim 8, it is characterized in that, described HM Hydraulic Motor has the first hydraulic fluid port, the second hydraulic fluid port, the two switches mutually respectively as oil inlet, oil outlet, described pressure sensor comprises to be located at described first hydraulic fluid port, for detecting the first pressure sensor of the first load pressure, and to be located at described second hydraulic fluid port, for detecting the second pressure sensor of the second load pressure;
Described control unit also for more described first load pressure, described second load pressure, using wherein larger one as described present load pressure.
10. the power control unit of the weight-lifting equipment according to any one of claim 7-9, is characterized in that, described control unit is also for according to the more described present load pressure of described electric signal and preset high-pressure, pre-set low pressure;
And when described present load pressure is greater than described preset high-pressure, send the current adjustment of rotational speed of described driving engine to the first control command of high-speed operation; When described present load pressure is less than described pre-set low pressure, send the current adjustment of rotational speed of described driving engine to the second control command of tickover; When described present load pressure is between described preset high-pressure, described pre-set low pressure, send the 3rd control command keeping current state constant.
The power-control method of 11. weight-lifting equipments according to claim 10, is characterized in that, described preset high-pressure is less than the critical pressure making described engine off when described engine idling operation.
The power-control method of 12. weight-lifting equipments according to claim 11, is characterized in that, described control unit also for:
Judge described present load pressure be greater than described preset high-pressure after, send described first control command before, also continue to judge that described present load pressure is in this scope and whether continues the first Preset Time, if so, send described first control command, if not, described 3rd control command is sent;
And judge described present load pressure be less than described pre-set low pressure after, send described second control command before, also continue to judge that described present load pressure is in this scope whether lasting second Preset Time, if so, send described second control command; If not, described 3rd control command is sent.
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| CN108128301A (en) * | 2017-12-21 | 2018-06-08 | 潍柴动力股份有限公司 | A kind of engine power adjusting method, device and electronic equipment |
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| CN104386584B (en) | 2018-01-26 |
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