CN104002674B - Power drive system, control method and single-shot formula autocrane - Google Patents
Power drive system, control method and single-shot formula autocrane Download PDFInfo
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- CN104002674B CN104002674B CN201410256512.4A CN201410256512A CN104002674B CN 104002674 B CN104002674 B CN 104002674B CN 201410256512 A CN201410256512 A CN 201410256512A CN 104002674 B CN104002674 B CN 104002674B
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Abstract
The present invention relates to a kind of power drive system, control method and single-shot formula autocrane, system includes engine and adjustment of rotational speed parts, transmission mechanism and hydraulic pump, it is characterized in that, also include: speed ratio guiding mechanism, it is arranged between described transmission mechanism and described hydraulic pump, for adjusting from described engine to the speed ratio of described hydraulic pump according to Transmission Ratio Control signal；Controller, it is connected with described adjustment of rotational speed parts, the electronic control unit of described engine and described speed ratio guiding mechanism, for sending speed controling signal and Transmission Ratio Control signal to the electronic control unit of described engine and described speed ratio guiding mechanism respectively according to the adjustment of rotational speed signal of described adjustment of rotational speed parts.Compared to the existing definite value speed ratio kind of drive, the present invention is still operated in preferable economic zone by can make hydraulic pump engine when middle high rotating speed to the regulation of speed ratio, keeps suitable engine load rate, to obtain preferable fuel economy.
Description
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of power drive system, method and
Single-shot formula autocrane.
Background technology
Single-shot formula autocrane is that a kind of chassis travels and operation of getting on the bus shares an engine
Mobilecrane, this crane can take into account travelling and workability simultaneously, on chassis
The output power of engine can be adjusted by traveling aspect, the speed changer got off and drive axle,
Engine is made to work at zone of reasonableness.And in terms of operation of getting on the bus, engine then by gearbox/
Power takeoff is joined directly together with hydraulic pump, with (the i.e. input speed of power train and the output of definite value speed ratio
The ratio of rotating speed) transmit power.Owing to the transmission system of definite value speed ratio can cause engine
Rotating speed is proportional to the rotating speed of hydraulic pump, when hydraulic pump is at middle high rotating speed, it is desirable to engine also work
Make at middle high rotating speed, and when engine is operated in middle high rotating speed, engine possesses relatively high power
Fan-out capability, and now hydraulic pump power demand is much smaller than the power output of engine, causes sending out
Engine load rate is low, and the operating point of engine is in non-economy region, fuel economy difference.
As it is shown in figure 1, the principle of the power drive system of getting on the bus for existing typical automotive crane
Schematic diagram, this power transmission of getting on the bus includes engine a1, gearbox/power takeoff a2, biography
Moving axis a3, hydraulic pump a4, gas pedal a5 etc., engine a1 passes through gearbox/power takeoff
A2, power transmission shaft a3 are connected with hydraulic pump a4, and the speed ratio of its power train is definite value, engine a1
Rotating speed with gas pedal a5 stroke change and change.Rise with certain single-shot automobile of this structure
As a example by heavy-duty machine, its equipment quality 43t, joined diesel engine power is 276kW, and its specific power is
6.4Kw/t, is just met for traveling demand of getting off, and the 130ml/r variable pump that it gets on the bus joined is maximum
Power consumption is 190kW, and joined diesel engine can meet the demand of pump before 1300rpm,
But owing to its power drive system of getting on the bus is constant-speed ratio system, necessarily cause diesel engine to turn at middle height
During speed (i.e. more than 1300rpm), rate of load condensate can reduce, fuel economy difference.And add up and show,
Autocrane is within the whole working time of engine, and the activity duration of getting on the bus constitutes about 70%,
Therefore, engine load rate and the fuel economy of existing single-shot formula autocrane is needed badly and is changed
Kind.
Content of the invention
The purpose of the present invention is to propose to a kind of power drive system, method and single-shot formula automobile crane
Machine, can improve engine load rate and fuel economy.
For achieving the above object, the invention provides a kind of power drive system, including engine
And adjustment of rotational speed parts, transmission mechanism and hydraulic pump, wherein, also include:
Speed ratio guiding mechanism, is arranged between described transmission mechanism and described hydraulic pump, is used for root
Adjust from described engine to the speed ratio of described hydraulic pump according to Transmission Ratio Control signal；
Controller, with described adjustment of rotational speed parts, the electronic control unit of described engine and institute
State speed ratio guiding mechanism to be connected, for dividing according to the adjustment of rotational speed signal of described adjustment of rotational speed parts
Do not send rotating speed control letter to electronic control unit and the described speed ratio guiding mechanism of described engine
Number and Transmission Ratio Control signal.
Further, described speed ratio guiding mechanism is metal band type stepless speed variator or fluid drive
Device.
Further, described adjustment of rotational speed parts are gas pedal.
Further, described transmission mechanism is gearbox/power takeoff.
For achieving the above object, the invention provides a kind of based on aforesaid power drive system
Control method for power transmission, wherein, comprising:
Adjustment of rotational speed parts adjust signal to controller output speed；
Described controller according to described adjustment of rotational speed signal respectively to the Electronic Control list of engine
Unit and speed ratio guiding mechanism send speed controling signal and Transmission Ratio Control signal；
The electronic control unit of described engine is sent out according to described speed controling signal adjusts
The output speed of motivation；
Described speed ratio guiding mechanism according to described Transmission Ratio Control signal adjust from described engine to
The speed ratio of described hydraulic pump.
Further, described adjustment of rotational speed signal, described speed controling signal and described speed ratio control
Signal processed is voltage signal；Described controller according to described adjustment of rotational speed signal respectively to starting
The electronic control unit of machine and speed ratio guiding mechanism send speed controling signal and Transmission Ratio Control signal
Operation particularly as follows:
Described controller judges the corresponding voltage value scope of described adjustment of rotational speed signal, if institute
State adjustment of rotational speed signal and be in minimum amount of voltage that and the correspondence that described adjustment of rotational speed parts can export
Between the reference voltage level of maximum engine torque rotating speed, then direct by described adjustment of rotational speed letter
It number is sent to the electronic control unit of described engine as speed controling signal, and by described
Reference voltage level is sent to described speed ratio guiding mechanism as Transmission Ratio Control signal；
If adjustment of rotational speed signal is in described reference voltage level and described adjustment of rotational speed parts energy
Between the maximum voltage value of enough output, then described reference voltage level is sent out as speed controling signal
Give the electronic control unit of described engine, and using described adjustment of rotational speed signal as speed ratio
Control signal is sent to described speed ratio guiding mechanism.
Further, the electronic control unit of described engine is adjusted according to described speed controling signal
The operation of the output speed of whole described engine particularly as follows:
If the speed controling signal that the electronic control unit of described engine receives is described turn
Velocity modulation entire signal, the then increase of the stroke with described adjustment of rotational speed parts for the rotating speed of described engine
And increase；
If the speed controling signal that the electronic control unit of described engine receives is described ginseng
Examine magnitude of voltage, then the adjustment of rotational speed of described engine is described maximum engine torque rotating speed.
Further, the increasing at stroke with described adjustment of rotational speed parts of the rotating speed of described engine
During adding and increasing, the rotating speed of described engine turns without departing from described maximum engine torque
Speed.
Further, described speed ratio guiding mechanism adjusts from described according to described Transmission Ratio Control signal
The operation of the speed ratio to described hydraulic pump for the engine particularly as follows:
If the Transmission Ratio Control signal that described speed ratio guiding mechanism receives is described reference voltage level,
Then described speed ratio guiding mechanism adjust from described engine to the speed ratio of described hydraulic pump for described
Reference voltage level corresponding definite value speed ratio；
If the Transmission Ratio Control signal that described speed ratio guiding mechanism receives is described adjustment of rotational speed letter
Number, then described speed ratio guiding mechanism adjusts from described engine to the speed ratio of described hydraulic pump with institute
State the increase of the stroke of adjustment of rotational speed parts and reduce.
Further, adjust from described engine to described hydraulic pump at described speed ratio guiding mechanism
The increase of the stroke with described adjustment of rotational speed parts for the speed ratio and during reducing, described from institute
State the value of the speed ratio to described hydraulic pump for the engine in described reference voltage level corresponding definite value speed
Than and the maximum output speed of described maximum engine torque rotating speed and described engine ratio it
Between.
For achieving the above object, present invention also offers a kind of single-shot formula autocrane, it is special
Levy and be, the aforesaid power drive system of employing of getting on the bus of described single-shot formula autocrane.
Based on technique scheme, the present invention is provided with speed ratio between transmission mechanism and hydraulic pump
Guiding mechanism, the Transmission Ratio Control signal that can provide according to controller adjusts from engine to liquid
The speed ratio of press pump, controller then can be distinguished according to the adjustment of rotational speed signal of adjustment of rotational speed parts
Control engine and speed ratio guiding mechanism, compared to the existing definite value speed ratio kind of drive, this
It bright is still operated in preferably by can make hydraulic pump engine when middle high rotating speed to the regulation of speed ratio
Economic zone, to obtain preferable fuel economy.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the application
A part, the schematic description and description of the present invention is used for explaining the present invention, not structure
Become inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle signal of the power drive system of getting on the bus of existing typical automotive crane
Figure.
Fig. 2 is the principle schematic of an embodiment of power drive system of the present invention.
Fig. 3 is another of single-shot formula autocrane application of the present invention power drive system of the present invention
The principle schematic of embodiment.
Fig. 4 is the schematic flow sheet of an embodiment of method for power transmission of the present invention.
Fig. 5 is the schematic flow sheet of another embodiment of method for power transmission of the present invention.
Fig. 6 is the control strategy schematic diagram of method for power transmission embodiment middle controller of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is done and further retouches in detail
State.
As in figure 2 it is shown, the principle schematic of the embodiment for power drive system of the present invention.
In the present embodiment, power drive system includes engine 1 and the 5th, the transmission of adjustment of rotational speed parts
Mechanism 2 and hydraulic pump 4, be additionally provided with speed ratio between transmission mechanism 2 and hydraulic pump 4 and adjust machine
Structure 3, can be according to Transmission Ratio Control signal so2Adjust from engine 1 to the speed ratio of hydraulic pump 4.
The power drive system of the present embodiment also includes controller 6, this controller 6 and adjustment of rotational speed portion
The electronic control unit ECU of part the 5th, engine 1 (i.e. engine 1 internal element, in figure not
Draw) it is connected with speed ratio guiding mechanism 3, can be according to the adjustment of rotational speed of adjustment of rotational speed parts 5
Signal siSend rotating speed control to electronic control unit and the speed ratio guiding mechanism 3 of engine 1 respectively
Signal s processedo1With Transmission Ratio Control signal so2。
Compared with the power drive system of getting on the bus of the existing typical autocrane shown in Fig. 1,
The present embodiment adds between transmission mechanism 2 and hydraulic pump 4 and can be adjusted speed ratio
Speed ratio guiding mechanism 3, and adjustment of rotational speed parts 5 are no longer direct is controlled engine 1,
And be intended to be divided according to the adjustment of rotational speed situation of adjustment of rotational speed parts 5 by newly-increased controller
Other engine 1 and speed ratio guiding mechanism 3 are controlled, obtain compared to existing definite value speed ratio
Power drive system, the present embodiment can be by making engine turn at height the regulation of speed ratio
It is still operated in preferable economic zone during speed, keeps suitable engine load rate, to obtain relatively
Good fuel economy.
In the present embodiment, speed ratio guiding mechanism 3 can use metal band type stepless speed variator
(Continuously Variable Transmission is called for short CVT) or automatic transmission
(Automatic Transmission is called for short AT), the preferably CVT of variable speed.Rotating speed
Adjust the adjustment parts that parts can be mechanical type or electric-controlled type, for autocrane,
Adjustment of rotational speed parts may be selected to be mechanical gas pedal, it is also possible to is that the throttle of electronic type is held
Row device, throttle control etc..Accelerator open degree can be changed by trampling gas pedal, thus defeated
Go out corresponding adjustment of rotational speed signal.
Transmission mechanism 2 can be gearbox/power takeoff, also can be only in other application scenarios
Including gearbox or power takeoff, or use both simultaneously.In addition, transmission mechanism 2
Also other drive disk assembly, such as transfer case etc. can be included according to different use occasions.
Based on the power drive system embodiment shown in Fig. 2, present invention also offers corresponding dynamic
Power transmission control method, as shown in Figure 4, is an embodiment of method for power transmission of the present invention
Schematic flow sheet, the method includes:
Step 101, adjustment of rotational speed parts adjust signal to controller output speed；
Step 102, controller according to described adjustment of rotational speed signal respectively to the electronics control of engine
Unit processed and speed ratio guiding mechanism send speed controling signal and Transmission Ratio Control signal；
Step 103, the electronic control unit of engine adjust institute according to described speed controling signal
State the output speed of engine；
Step 104, speed ratio guiding mechanism adjust according to described Transmission Ratio Control signal and start from described
Machine is to the speed ratio of described hydraulic pump.
Below as a example by single-shot formula autocrane, come illustratively at single-shot formula automobile of the present invention
The principle of another embodiment of crane applications power drive system of the present invention, as it is shown on figure 3,
Controller 6 connects gas pedal 51, and receives turning of voltage signal form from gas pedal 51
Velocity modulation entire signal Ui, the accelerator open degree of gas pedal 51 can be passed through by operator's Artificial Control
The control of accelerator open degree can be with output voltage range at Umin～UmaxAdjustment of rotational speed signal Ui,
And controller 6 is electrically connected the ECU of engine 1 and as speed ratio guiding mechanism
CVT31, can come respectively to the ECU of engine 1 according to the adjustment of rotational speed signal Ui obtaining
Send the speed controling signal U of voltage signal form with CVT31o1With Transmission Ratio Control signal Uo2。
Below based on Fig. 3 embodiment, illustrate one by the embodiment of the method shown in Fig. 5
Lower method for power transmission of the present invention realize flow process, as follows:
Step 201, operator's manual operation gas pedal control accelerator open degree, are stepped on by throttle
Plate is to the adjustment of rotational speed signal U of controller output voltage signal formi；
Step 202, controller judge adjustment of rotational speed signal UiCorresponding voltage value scope, as
Really adjustment of rotational speed signal UiIt is in the minimum that adjustment of rotational speed parts (i.e. gas pedal) can export
Magnitude of voltage UminWith corresponding to maximum engine torque rotating speed nmReference voltage level Um between,
Then step 203, if adjustment of rotational speed signal UiIt is in reference voltage level Um to adjust with rotating speed
Maximum voltage value U that integeral part can exportmaxBetween, then step 204；
Step 203, controller are directly by adjustment of rotational speed signal UiAs speed controling signal Uo1
It is sent to the ECU of engine, and using reference voltage level Um as Transmission Ratio Control signal Uo2
It is sent to speed ratio guiding mechanism (i.e. CVT)；
Step 204, controller using reference voltage level Um as speed controling signal Uo1Send
To the ECU of engine, and using adjustment of rotational speed signal Ui as Transmission Ratio Control signal Uo2Send out
Give speed ratio guiding mechanism；
Step 205, the electronic control unit of engine adjust institute according to described speed controling signal
Stating the output speed of engine, speed ratio guiding mechanism adjusts from institute according to described Transmission Ratio Control signal
State engine to the speed ratio of described hydraulic pump.
In the present embodiment, reference voltage level Um is in adjustment of rotational speed parts and can export
Small voltage value UminWith maximum voltage value UmaxBetween, the output speed scope of corresponding engine is
n0To nmax.And the physical meaning of this value corresponds to maximum engine torque rotating speed nmReference
Magnitude of voltage, in other words, when the ECU of engine is transfused to Um, maximum output torque
Rotating speed nm。
For step 203, if the speed controling signal that the ECU of engine receives
Uo1It is adjustment of rotational speed signal Ui, then be equivalent to directly be entered the rotating speed of engine by gas pedal
Row control, and the increase of the stroke that this rotating speed is with adjustment of rotational speed parts and do not increase, and not
Maximum engine torque rotating speed n can be exceededm, and the Transmission Ratio Control signal U that now CVT receiveso2
For the Um of definite value, therefore also maintain a stable speed ratio (such as speed ratio is 1 or 1.5),
When the rotating speed making engine is in relatively low numerical intervals, in step 205 by gas pedal
Directly control the rotating speed of engine.
In step 204, if the ECU of engine is the speed controling signal U that receiveso1
Be reference voltage level Um, then engine will export constant maximum engine torque rotating speed always,
And the Transmission Ratio Control signal U that now CVT receiveso2For adjustment of rotational speed signal Ui, then in step
In 205, CVT adjusts the increasing of the stroke with adjustment of rotational speed parts for the speed ratio from engine to hydraulic pump
Add and reduce.
As a example by the control strategy of the controller shown in Fig. 6, in order to enable the rotating speed of hydraulic pump
As the increase of aperture of gas pedal is linearly increasing, and the rotating speed being not intended to engine surpasses
Cross speed at maximum torque nm, then with throttle output voltage Um as reference point so that gas pedal
Output voltage is in UminWhen between Um, engine speed is according to gas pedal output voltage
Change and change, and now speed ratio is the 1 of definite value, then revolution speed can be at throttle output voltage
From UminLinearly increasing to Um.When throttle output voltage meets and exceeds Um, now lead to
Cross the control of controller so that engine output speed maintains speed at maximum torque nm, and
Change speed ratio so that it is from 1 to nm/nmaxBetween linear reduction, thus make revolution speed exist
Um to UmaxBetween still keep linear change.
Explanation by said system and embodiment of the method, it can be seen that the present invention can be at hydraulic pressure
When pump is in middle high rotating speed, makes engine be not necessarily in middle high rotating speed, and only need to maintain maximum
Moment of torsion rotating speed, thus avoids because possessing bigger work(when engine is operated in middle high rotating speed
Rate fan-out capability, and now hydraulic pump power demand is much smaller than the power output of engine, and lead
The engine load rate causing is low, the problem of fuel economy difference, otherwise gets on the bus compared to existing
Power drive system, present invention improves rate of load condensate and the fuel economy of engine.
The power drive system of the present invention is applicable to all kinds of work needing to control engine speed
Journey plant equipment, is especially suitable for applying getting on the bus at single-shot formula autocrane, passes for power
Dynamic.
Finally should be noted that: above example only in order to technical scheme to be described and
Non-to its restriction；Although the present invention being described in detail with reference to preferred embodiment, affiliated
The those of ordinary skill in field is it is understood that still can enter to the detailed description of the invention of the present invention
Row is changed or carries out equivalent to portion of techniques feature；Without deviating from technical solution of the present invention
Spirit, it all should be covered in the middle of the technical scheme scope that the present invention is claimed.
Claims (10)
1. a power drive system, including engine and adjustment of rotational speed parts, transmission mechanism
And hydraulic pump, it is characterised in that also include:
Speed ratio guiding mechanism, is arranged between described transmission mechanism and described hydraulic pump, is used for root
Adjust from described engine to the speed ratio of described hydraulic pump according to Transmission Ratio Control signal；
Controller, with described adjustment of rotational speed parts, the electronic control unit of described engine and institute
State speed ratio guiding mechanism to be connected, for dividing according to the adjustment of rotational speed signal of described adjustment of rotational speed parts
Do not send rotating speed control letter to electronic control unit and the described speed ratio guiding mechanism of described engine
Number and Transmission Ratio Control signal；
Described adjustment of rotational speed signal, described speed controling signal and described Transmission Ratio Control signal are
Voltage signal；Described controller according to described adjustment of rotational speed signal respectively to the electronics control of engine
Unit processed and speed ratio guiding mechanism send speed controling signal and the operation of Transmission Ratio Control signal is concrete
For:
Described controller judges the corresponding voltage value scope of described adjustment of rotational speed signal, if institute
State adjustment of rotational speed signal and be in minimum amount of voltage that and the correspondence that described adjustment of rotational speed parts can export
Between the reference voltage level of maximum engine torque rotating speed, then direct by described adjustment of rotational speed letter
It number is sent to the electronic control unit of described engine as speed controling signal, and by described
Reference voltage level is sent to described speed ratio guiding mechanism as Transmission Ratio Control signal；
If adjustment of rotational speed signal is in described reference voltage level and described adjustment of rotational speed parts energy
Between the maximum voltage value of enough output, then described reference voltage level is sent out as speed controling signal
Give the electronic control unit of described engine, and using described adjustment of rotational speed signal as speed ratio
Control signal is sent to described speed ratio guiding mechanism.
2. power drive system according to claim 1, it is characterised in that described speed
It is metal band type stepless speed variator or automatic transmission than guiding mechanism.
3. power drive system according to claim 1, it is characterised in that described turn
Velocity modulation integeral part is gas pedal.
4. power drive system according to claim 1, it is characterised in that described biography
Motivation structure is gearbox/power takeoff.
5. the power transmission based on the arbitrary described power drive system of Claims 1 to 4
Control method, it is characterised in that include:
Adjustment of rotational speed parts adjust signal to controller output speed；
Described controller according to described adjustment of rotational speed signal respectively to the Electronic Control list of engine
Unit and speed ratio guiding mechanism send speed controling signal and Transmission Ratio Control signal；
The electronic control unit of described engine is sent out according to described speed controling signal adjusts
The output speed of motivation；
Described speed ratio guiding mechanism according to described Transmission Ratio Control signal adjust from described engine to
The speed ratio of described hydraulic pump；
Described adjustment of rotational speed signal, described speed controling signal and described Transmission Ratio Control signal are
Voltage signal；Described controller according to described adjustment of rotational speed signal respectively to the electronics control of engine
Unit processed and speed ratio guiding mechanism send speed controling signal and the operation of Transmission Ratio Control signal is concrete
For:
Described controller judges the corresponding voltage value scope of described adjustment of rotational speed signal, if institute
State adjustment of rotational speed signal and be in minimum amount of voltage that and the correspondence that described adjustment of rotational speed parts can export
Between the reference voltage level of maximum engine torque rotating speed, then direct by described adjustment of rotational speed letter
It number is sent to the electronic control unit of described engine as speed controling signal, and by described
Reference voltage level is sent to described speed ratio guiding mechanism as Transmission Ratio Control signal；
If adjustment of rotational speed signal is in described reference voltage level and described adjustment of rotational speed parts energy
Between the maximum voltage value of enough output, then described reference voltage level is sent out as speed controling signal
Give the electronic control unit of described engine, and using described adjustment of rotational speed signal as speed ratio
Control signal is sent to described speed ratio guiding mechanism.
6. Control method for power transmission according to claim 5, it is characterised in that institute
The electronic control unit stating engine adjusts the defeated of described engine according to described speed controling signal
Go out the operation of rotating speed particularly as follows:
If the speed controling signal that the electronic control unit of described engine receives is described turn
Velocity modulation entire signal, the then increase of the stroke with described adjustment of rotational speed parts for the rotating speed of described engine
And increase；
If the speed controling signal that the electronic control unit of described engine receives is described ginseng
Examine magnitude of voltage, then the adjustment of rotational speed of described engine is described maximum engine torque rotating speed.
7. Control method for power transmission according to claim 6, it is characterised in that
The increase of the stroke with described adjustment of rotational speed parts for the rotating speed of described engine and the process that increases
In, the rotating speed of described engine is without departing from described maximum engine torque rotating speed.
8. Control method for power transmission according to claim 5, it is characterised in that institute
State speed ratio guiding mechanism to adjust from described engine to described hydraulic pressure according to described Transmission Ratio Control signal
The operation of the speed ratio of pump particularly as follows:
If the Transmission Ratio Control signal that described speed ratio guiding mechanism receives is described reference voltage level,
Then described speed ratio guiding mechanism adjust from described engine to the speed ratio of described hydraulic pump for described
Reference voltage level corresponding definite value speed ratio；
If the Transmission Ratio Control signal that described speed ratio guiding mechanism receives is described adjustment of rotational speed letter
Number, then described speed ratio guiding mechanism adjusts from described engine to the speed ratio of described hydraulic pump with institute
State the increase of the stroke of adjustment of rotational speed parts and reduce.
9. Control method for power transmission according to claim 8, it is characterised in that
Described speed ratio guiding mechanism adjusts from described engine to the speed ratio of described hydraulic pump with described rotating speed
Adjust the increase of stroke of parts and during reducing, described from described engine to described liquid
The value of the speed ratio of press pump is at described reference voltage level corresponding definite value speed ratio and described engine
Between the ratio of high pulling torque rotating speed and the maximum output speed of described engine.
10. a single-shot formula autocrane, it is characterised in that described single-shot formula automobile crane
Getting on the bus of machine uses the arbitrary described power drive system of Claims 1 to 4.
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| CN104477780B (en) * | 2014-12-04 | 2017-05-03 | 徐州重型机械有限公司 | Device and method for controlling crane operation speed |
| CN105422300A (en) * | 2015-12-01 | 2016-03-23 | 潍柴动力股份有限公司 | Engine control method and system |
| CN105711581B (en) * | 2016-03-30 | 2017-12-05 | 河南科技大学 | A kind of control method of stepless speed changing tractor control system |
| CN105711582B (en) * | 2016-04-01 | 2018-10-19 | 河南科技大学 | What a kind of Multi-Range Hydro-Mechanical Stepless speed changer changed section control system changes phase method |
| CN107983525A (en) * | 2017-12-04 | 2018-05-04 | 徐工集团工程机械有限公司 | Control method, dynamical system and the jaw crusher of dynamical system |
| CN108131364A (en) * | 2017-12-25 | 2018-06-08 | 徐州重型机械有限公司 | A kind of power drive system and its control method |
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| CN102729814A (en) * | 2012-06-27 | 2012-10-17 | 三一重工股份有限公司 | Engineering machinery vehicle |
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