CN104088926B - Single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission - Google Patents
Single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission Download PDFInfo
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- CN104088926B CN104088926B CN201410298022.0A CN201410298022A CN104088926B CN 104088926 B CN104088926 B CN 104088926B CN 201410298022 A CN201410298022 A CN 201410298022A CN 104088926 B CN104088926 B CN 104088926B
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Abstract
Single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, comprises gearshift clutch control, planet row clutch control, lubricating and cooling system and oil supply system; Pilot pressure needed for described gearshift clutch control, planet row clutch control and lubricating and cooling system three systems successively decreases successively.Beneficial effect: the 1. use of clutch accumulator ensures that Stress control is accurate, more ensure that pressure change is mild and make up a small amount of oil liquid leakage; 2. after planet row, timing clutch adopts solenoid directional control valve to control, and keeps, on the basic basis stably of gearshift, reducing hydraulic control cost; 3. the use of temperature transducer improves intelligence degree of the present invention, saves energy consumption; 4. oil feed pump adopts small displacement high-pressure gear pump, adapts to clutch control oil pressure large, needs oil mass few; Cooling uses huge discharge low pressure gear pump, adapts to cooling and lubricating oil circuit pressure little, needs oil mass large.
Description
Technical field
The present invention relates to a kind of with the control system of hydrodynamic pressure solenoidoperated cluthes, the clutch control particularly in a kind of hydraulic control system of stepless transmission case.
Background technique
Vehicle in the process of moving, its load changes with pavement behavior and travelling state, particularly for off roaders such as high-power agri-vehicle, engineering vehicles, their transmitted powers are large, operating environment is severe, external load fluctuation is frequent, and this will ask speed changer in time to change rotating speed and torque to adapt to the continuous change of actual load, ensure the power performance and the economy performance of vehicle.Though traditional stepped transmission case can reach certain requirement by gearshift, by fixed drive ratio transmitted power, stepless change can only cannot be realized, if increase gear, then can strengthen the complexity of speed changer mechanical structure, and cost increases, operating difficulties, seriously constrains the raising of its performance.
Stepless change is the desirable type of belt drive of vehicle, and it can make vehicle be in best travelling state according to pavement behavior and engine behavior.In vehicle travel process, load constantly changes with pavement behavior and travelling state, vehicle stepless change can continuously change velocity ratio with extraneous load and road conditions, makes the power of vehicle powertrain by reaching optimum Match with the power needed for vehicle after stepless speed variator; The consecutive variations of the speed of a motor vehicle can be realized simultaneously, without gearshift step phenomenon, decrease the impact of Vehicle Shifting, improve the travelling comfort of vehicle; In addition, stepless change can make motor work near best power source linearity curve or optimal economic linearity curve, improves the transmission performance of vehicle, reduces noise.This energy shortage, environmental pollution increasingly sharpen when the epoch significant.
Hydraulic mechanism stepless change power transmission system comprises motor, Multi-Range Hydro-Mechanical Stepless speed changer (HMCVT), control system of speed variator, central transmission and final drive gear, traveller and tractive load.HMCVT adopts hydraulic stepless speed changes poower flow and mechanical step change poower flow Composite Transmission.In order to expand gear range and improve transmission efficiency, HMCVT adopts multiple clutch and planetary mechanism composition multistage continuous stepless speed changer structure usually, this makes its control system should the discharge capacity ratio of Moderator Variable pump-motor system, stepless change in the section of realization, the Engage and disengage of solenoidoperated cluthes again, realize the switching of active section, control complicated difficulty.
The wet friction clutch of multistage HMCVT can replace the effect of main clutch, in hydraulic machinery stepless change power transmission system, eliminates main clutch, and speed changer is then multistage HMCVT.Tractive load is the major influence factors of control system of speed variator work.The control of control system of speed variator is mainly by the control realization to speed change box clutch.
Traditional speed change box clutch hydraulic control system is mainly for gearshift clutch or double clutch.Single file is arranged hydraulic machinery infinitely variable transmission requirement of confluxing and the HYDRAULIC CONTROL SYSTEM problem that transfer case shift mechanisms clutch, planet row timing clutch engage comprehensively is analyzed, make clutch smooth engagement, good stability, and resolve lubrication problem on this basis, reduce energy loss.
Summary of the invention
Goal of the invention: the object of the invention is in order to the HYDRAULIC CONTROL SYSTEM problem solving infinitely variable transmission gearshift mechanism clutch, planet row timing clutch engages, solve hydraulic system cooling and lubricating problem simultaneously, make that clutch hydraulic pressure Control system architecture is simple, manufacture difficulty is little, cost is low, oil pressure cntrol is stablized, and cooling and lubricating system is reliable, energy consumption is little.The invention provides a kind of single planetary row to conflux the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission.
Technological scheme: a kind of single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, comprises gearshift clutch control, planet row clutch control, lubricating and cooling system and oil supply system; Pilot pressure needed for described gearshift clutch control, planet row clutch control and lubricating and cooling system three systems successively decreases successively.
Each clutch in described gearshift clutch control and planet row clutch control accesses each oil circuit control by spring reset oil cylinder, makes each clutch quick separating by spring reset oil cylinder spring action.
Described gearshift clutch control comprises single planetary row and to conflux the pure hydraulic transmission clutch of hydraulic machinery infinitely variable transmission, Hydrostatic-mechanical Transmission low gear clutch, gear clutch in Hydrostatic-mechanical Transmission, Hydrostatic-mechanical Transmission height gear clutch, three position four-way electromagnetic valve and unidirectional adjustable restrictive valve, Access Control oil circuit after described pure hydraulic transmission clutch is communicated with three position four-way electromagnetic valve respectively by unidirectional adjustable restrictive valve with Hydrostatic-mechanical Transmission low gear clutch, in described Hydrostatic-mechanical Transmission, gear clutch is communicated with rear Access Control oil circuit respectively by unidirectional adjustable restrictive valve with another three position four-way electromagnetic valve with Hydrostatic-mechanical Transmission height gear clutch, described three position four-way electromagnetic valve energising, working connection fluid flows into corresponding spring reset oil cylinder through unidirectional adjustable restrictive valve, promote corresponding clutch to engage, now other spring reset oil cylinders are by meta oil return, the engaging speed of the adjustable clutch of described unidirectional adjustable restrictive valve, reduce the section of changing to impact, no longer change after the large I manual tune of amount of restriction, for avoiding interfering phenomenon in clutch handoff procedure, oil circuit does not carry out flow restriction control, make separating rate faster than engaging speed, fluid is got back in fuel tank through fuel-displaced oil circuit.
Planet carrier clutch, reversing solenoid valve, solenoid-operated proportional reduction valve and two-position three way magnetic valve is connect after connecing ring gearwheel clutch, planet row after connecing ring gearwheel clutch, planet row before connecing planet carrier clutch, planet row before described planet row clutch control comprises planet row, connect planet carrier clutch before described planet row and connect ring gearwheel clutch before planet row and be respectively communicated with oil circuit control by solenoid-operated proportional reduction valve with reversing solenoid valve successively, connect ring gearwheel clutch after described planet row and connect planet carrier clutch after planet row and be communicated with oil circuit control respectively by two-position three way magnetic valve.Owing to not establishing main clutch, connect ring gearwheel clutch before connecing planet carrier clutch and planet row before planet row and according to rules of engagement, moment of torsion control is carried out to motor respectively, therefore adopt Stress control, make clutch smooth engagement, play the effect of main clutch; Connecing planet carrier clutch after connecing ring gearwheel clutch, planet row after planet row adopts two-position three way magnetic valve to control, and changes on this stable basis of segment base, reduce hydraulic control system cost in guarantee.The working pressure connecing ring gearwheel clutch before connecing planet carrier clutch and planet row before planet row is regulated by solenoid-operated proportional reduction valve, and fluid is inputted spring reset oil cylinder through reversing solenoid valve.For ensureing pressure controling precision, realize closed loop control, and pressure transducer has been installed, as feedback in the outlet of solenoid-operated proportional reduction valve.The filler opening place connecing the spring reset oil cylinder of ring gearwheel clutch before connecing planet carrier clutch and planet row before planet row in described planet row clutch control is respectively equipped with clutch accumulator.Clutch accumulator is used for keep-spring drawback cylinder internal pressure and makes up a small amount of oil liquid leakage.Connect planet carrier clutch in described planet row clutch control before planet row to be respectively equipped with high-speed switch electromagnetic valve with the filler opening place of the spring reset oil cylinder connecing ring gearwheel clutch before planet row and to be connected with fuel tank.Clutch separation adjustment process, precision prescribed, lower than joining accuracy, can be controlled by the pulsewidth modulation of high-speed switch electromagnetic valve.
Described lubricating and cooling system comprises hydraulic electric motor, huge discharge low pressure gear pump and cooling and lubricating oil circuit; Lubricating and cooling system drives the work of huge discharge low pressure gear pump by hydraulic electric motor, provides circulation fluid to carry out cooling and lubricating.Because timing clutch engages frequent, comparatively gearshift clutch is high to produce temperature, and huge discharge low pressure gear pump should near planet row timing clutch part, especially planet row preamble clutch part.Select the object of huge discharge low pressure gear pump to be that lubricating and cooling system pressure is large, need oil mass few.Design like this can reduce gearbox energy consumption, raises the efficiency the reliability with oil-way system.Consider running conditions of vehicle, timing clutch and gearshift fuel consumption few, the accumulator oil-filled time is short, can not have influence on the cooling result of clutch, can share a fuel tank.Be provided with temperature transducer in the oil circuit of lubricating and cooling system, the signal feed back of described temperature transducer is to hydraulic electric motor.Mounting temperature sensor in planet row preamble clutch, feeds back to hydraulic electric motor by oil temperature, when oil temperature exceed arrange time, primer fluid Medium-voltage Motor carries out cooling and lubricating.
Described oil supply system comprises fuel tank, small displacement high-pressure gear pump, relief valve, pressure relay and pressure transducer.Be provided with working connection accumulator in the working connection of described oil supply system, make the oil liquid pressure protection in working connection stable, in order to the control accuracy of clutch is given security by working connection accumulator.The high voltage control oil that described oil supply system provides small flow to respectively gearshift clutch control and planet row clutch control, the working pressure of described gearshift clutch control is set by relief valve, described pressure transducer is arranged on solenoid-operated proportional reduction valve filler opening, the pressure signal transmission of described pressure transducer is to pressure relay, and the working pressure of described planet row clutch control is set by pressure relay.
During for guaranteeing the operating mode such as engine start and parking, the separation of clutch, avoids engine misses, is provided with electromagnetic switch valve between the oil outlet of described small displacement high-pressure gear pump and fuel tank.During the operating mode such as engine start and parking, electromagnetic switch valve must not be electric, the fluid that small displacement high-pressure gear pump pumps is by the direct oil sump tank of electromagnetic switch valve, and when vehicle normally runs, electromagnetic switch valve obtains electric, this oil circuit disconnects, and the fluid of power supply system enters oil circuit control.
Beneficial effect: 1. clutch engages planet row preamble clutch feed system frequently and adopts Stress control, and setting pressure sensor, realize closed loop control, ensure that Stress control is accurate, the use of clutch accumulator, more ensure that pressure change is mild and make up a small amount of oil liquid leakage; 2. after planet row, timing clutch adopts solenoid directional control valve to control, and keeps, on the basic basis stably of gearshift, reducing hydraulic control cost; 3. serviceability temperature sensor test planet row preamble clutch place oil temperature, when exceeding capping, primer fluid Medium-voltage Motor, makes huge discharge low pressure gear pump to lubricating and cooling system fuel feeding; When oil temperature drops to setting lower limit, motor is out of service, saves energy consumption; 4. oil feed pump adopts small displacement high-pressure gear pump, adapts to clutch control oil pressure large, needs oil mass few; Cooling uses huge discharge low pressure gear pump, adapts to cooling and lubricating oil circuit pressure little, needs oil mass large.
Accompanying drawing explanation
Fig. 1 is that single planetary row of the present invention confluxes the structure principle chart of hydraulic machinery infinitely variable transmission;
Fig. 2 is the hydraulic principle figure of speed change box clutch of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in the figure, a kind of single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, comprises gearshift clutch control 1, planet row clutch control 2, lubricating and cooling system 3 and oil supply system 4; Pilot pressure needed for described gearshift clutch control 1, planet row clutch control 2 and lubricating and cooling system 3 three systems successively decreases successively.
Each clutch in described gearshift clutch control 1 and planet row clutch control 2 accesses each oil circuit control by spring reset oil cylinder 5, makes each clutch quick separating by spring reset oil cylinder 5 spring action.
Described gearshift clutch control 1 comprises single planetary row and to conflux the pure hydraulic transmission clutch 11 of hydraulic machinery infinitely variable transmission, Hydrostatic-mechanical Transmission low gear clutch 12, gear clutch 13 in Hydrostatic-mechanical Transmission, Hydrostatic-mechanical Transmission height gear clutch 14, three position four-way electromagnetic valve 15 and unidirectional adjustable restrictive valve 16, described pure hydraulic transmission clutch 11 is communicated with rear Access Control oil circuit respectively by unidirectional adjustable restrictive valve 16 with three position four-way electromagnetic valve 15 with Hydrostatic-mechanical Transmission low gear clutch 12, in described Hydrostatic-mechanical Transmission, gear clutch 13 is communicated with rear Access Control oil circuit respectively by unidirectional adjustable restrictive valve 16 with another three position four-way electromagnetic valve 15 with Hydrostatic-mechanical Transmission height gear clutch 14, described three position four-way electromagnetic valve 15 is energized, working connection fluid flows into corresponding spring reset oil cylinder 5 through unidirectional adjustable restrictive valve 16, promote corresponding clutch to engage, now other spring reset oil cylinders 5 are by meta oil return, the engaging speed of the adjustable clutch of described unidirectional adjustable restrictive valve 16, reduce the section of changing to impact, no longer change after the large I manual tune of amount of restriction, for avoiding interfering phenomenon in clutch handoff procedure, oil circuit does not carry out flow restriction control, make separating rate faster than engaging speed, fluid is got back in fuel tank 41 through fuel-displaced oil circuit.
Planet carrier clutch 21 is connect before described planet row clutch control 2 comprises planet row, ring gearwheel clutch 22 is connect before planet row, ring gearwheel clutch 23 is connect after planet row, planet carrier clutch 24 is connect after planet row, reversing solenoid valve 25, solenoid-operated proportional reduction valve 26 and two-position three way magnetic valve 27, connect planet carrier clutch 21 before described planet row and connect ring gearwheel clutch 22 before planet row and be communicated with oil circuit control by solenoid-operated proportional reduction valve 26 with reversing solenoid valve 25 successively respectively, connect ring gearwheel clutch 23 after described planet row and connect planet carrier clutch 24 after planet row and be communicated with oil circuit control respectively by two-position three way magnetic valve 27, owing to not establishing main clutch, connect ring gearwheel clutch 22 before connecing planet carrier clutch 21 and planet row before planet row and according to rules of engagement, moment of torsion control is carried out to motor respectively, therefore adopt Stress control, make clutch smooth engagement, play the effect of main clutch, connecing planet carrier clutch 24 after connecing ring gearwheel clutch 23 and planet row after planet row adopts two-position three way magnetic valve 27 to control, and changes on this stable basis of segment base, reduce hydraulic control system cost in guarantee.The working pressure connecing ring gearwheel clutch 22 before connecing planet carrier clutch 21 and planet row before planet row is regulated by solenoid-operated proportional reduction valve 26, and fluid is inputted spring reset oil cylinder 5 through reversing solenoid valve 25.For ensureing pressure controling precision, realize closed loop control, and pressure transducer 45 has been installed, as feedback in solenoid-operated proportional reduction valve 26 outlet.
The filler opening place connecing the spring reset oil cylinder 5 of ring gearwheel clutch 22 before connecing planet carrier clutch 21 and planet row before planet row in described planet row clutch control 2 is respectively equipped with clutch accumulator 28.Clutch accumulator 28 is for keep-spring drawback cylinder 5 internal pressure and make up a small amount of oil liquid leakage.
Connect planet carrier clutch 21 in described planet row clutch control 2 before planet row to be respectively equipped with high-speed switch electromagnetic valve 29 with the filler opening place of the spring reset oil cylinder 5 connecing ring gearwheel clutch 22 before planet row and to be connected with fuel tank 41.Clutch separation adjustment process, precision prescribed, lower than joining accuracy, can be controlled by the pulsewidth modulation of high-speed switch electromagnetic valve 29.
Described lubricating and cooling system 3 comprises hydraulic electric motor 31, huge discharge low pressure gear pump 32 and cooling and lubricating oil circuit 33; Lubricating and cooling system 3 drives huge discharge low pressure gear pump 32 to work by hydraulic electric motor 31, provides circulation fluid to carry out cooling and lubricating.Because timing clutch engages frequent, comparatively gearshift clutch is high to produce temperature, and huge discharge low pressure gear pump 32 should near planet row timing clutch part, especially planet row preamble clutch part.Select the object of huge discharge low pressure gear pump 32 to be that lubricating and cooling system pressure is large, need oil mass few.Design like this can reduce gearbox energy consumption, raises the efficiency the reliability with oil-way system.Consider running conditions of vehicle, timing clutch and gearshift fuel consumption few, the accumulator oil-filled time is short, can not have influence on the cooling result of clutch, can share a fuel tank.Be provided with temperature transducer 34 in the oil circuit of lubricating and cooling system 3, the signal feed back of described temperature transducer 34 is to hydraulic electric motor 31.Mounting temperature sensor 34 in planet row preamble clutch, feeds back to hydraulic electric motor 31 by oil temperature, when oil temperature exceed arrange time, primer fluid Medium-voltage Motor 31 carries out cooling and lubricating.
Described oil supply system 4 comprises fuel tank 41, small displacement high-pressure gear pump 42, relief valve 43, pressure relay 44 and pressure transducer 45; Be provided with working connection accumulator 46 in the working connection of described oil supply system 4, make the oil liquid pressure protection in working connection stable, in order to the control accuracy of clutch is given security by working connection accumulator 46.The high voltage control oil that described oil supply system 4 provides small flow to respectively gearshift clutch control 1 and planet row clutch control 2, the working pressure of described gearshift clutch control 1 is set by relief valve 43, described pressure transducer 45 is arranged on solenoid-operated proportional reduction valve 26 filler opening, the pressure signal transmission of described pressure transducer 45 is to pressure relay 44, and the working pressure of described planet row clutch control 2 is set by pressure relay 44.
During for guaranteeing the operating mode such as engine start and parking, the separation of clutch, avoids engine misses, is provided with electromagnetic switch valve 6 between the oil outlet of described small displacement high-pressure gear pump 42 and fuel tank 41.During the operating mode such as engine start and parking, electromagnetic switch valve 6 must not be electric, the fluid that small displacement high-pressure gear pump 42 pumps is by electromagnetic switch valve 6 directly oil sump tank, and when vehicle normally runs, electromagnetic switch valve 6 obtains electric, this oil circuit disconnects, and the fluid of power supply system enters oil circuit control.
Claims (6)
1. single planetary row confluxes a clutch fluid pressure control system for hydraulic machinery infinitely variable transmission, it is characterized in that: comprise gearshift clutch control (1), planet row clutch control (2), lubricating and cooling system (3) and oil supply system (4), each clutch in described gearshift clutch control (1) and planet row clutch control (2) accesses each oil circuit control by spring reset oil cylinder (5), described gearshift clutch control (1) comprises single planetary row and to conflux the pure hydraulic transmission clutch (11) of hydraulic machinery infinitely variable transmission, Hydrostatic-mechanical Transmission low gear clutch (12), gear clutch (13) in Hydrostatic-mechanical Transmission, Hydrostatic-mechanical Transmission height gear clutch (14), three position four-way electromagnetic valve (15) and unidirectional adjustable restrictive valve (16), Access Control oil circuit after described pure hydraulic transmission clutch (11) is communicated with three position four-way electromagnetic valve (15) respectively by unidirectional adjustable restrictive valve (16) with Hydrostatic-mechanical Transmission low gear clutch (12), in described Hydrostatic-mechanical Transmission, gear clutch (13) is communicated with rear Access Control oil circuit respectively by unidirectional adjustable restrictive valve (16) with another three position four-way electromagnetic valve (15) with Hydrostatic-mechanical Transmission height gear clutch (14), planet carrier clutch (21) is connect before described planet row clutch control (2) comprises planet row, ring gearwheel clutch (22) is connect before planet row, ring gearwheel clutch (23) is connect after planet row, planet carrier clutch (24) is connect after planet row, reversing solenoid valve (25), solenoid-operated proportional reduction valve (26) and two-position three way magnetic valve (27), connect planet carrier clutch (21) before described planet row and connect ring gearwheel clutch (22) before planet row and be respectively communicated with oil circuit control by solenoid-operated proportional reduction valve (26) with reversing solenoid valve (25) successively, connect ring gearwheel clutch (23) after described planet row and connect planet carrier clutch (24) after planet row and be communicated with oil circuit control respectively by two-position three way magnetic valve (27), described lubricating and cooling system (3) comprises hydraulic electric motor (31), huge discharge low pressure gear pump (32) and cooling and lubricating oil circuit (33), described oil supply system (4) comprises fuel tank (41), small displacement high-pressure gear pump (42), relief valve (43), pressure relay (44) and pressure transducer (45), the high voltage control oil that described oil supply system (4) provides small flow to respectively gearshift clutch control (1) and planet row clutch control (2), the working pressure of described gearshift clutch control (1) is set by relief valve (43), described pressure transducer (45) is arranged on solenoid-operated proportional reduction valve (26) filler opening, the pressure signal transmission of described pressure transducer (45) is to pressure relay (44), and the working pressure of described planet row clutch control (2) is set by pressure relay (44).
2. single planetary row according to claim 1 confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, it is characterized in that: be provided with working connection accumulator (46) in the working connection of described oil supply system (4).
3. single planetary row according to claim 1 confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, it is characterized in that: the filler opening place connecing the spring reset oil cylinder (5) of ring gearwheel clutch (22) before connecing planet carrier clutch (21) and planet row before planet row in described planet row clutch control (2) is respectively equipped with clutch accumulator (28).
4. single planetary row according to claim 1 confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, it is characterized in that: connect planet carrier clutch (21) in described planet row clutch control (2) before planet row and be respectively equipped with high-speed switch electromagnetic valve (29) with the filler opening place of the spring reset oil cylinder (5) connecing ring gearwheel clutch (22) before planet row and be connected with fuel tank (41).
5. single planetary row according to claim 1 confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, it is characterized in that: be provided with temperature transducer (34) in the oil circuit of lubricating and cooling system (3), the signal feed back of described temperature transducer (34) is to hydraulic electric motor (31).
6. single planetary row according to claim 1 confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission, it is characterized in that: be provided with electromagnetic switch valve (6) between the oil outlet of described small displacement high-pressure gear pump (42) and fuel tank (41).
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| CN201410298022.0A CN104088926B (en) | 2014-06-27 | 2014-06-27 | Single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission |
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| CN201410298022.0A CN104088926B (en) | 2014-06-27 | 2014-06-27 | Single planetary row confluxes the clutch fluid pressure control system of hydraulic machinery infinitely variable transmission |
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| CN104088926B true CN104088926B (en) | 2016-03-30 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104595431B (en) * | 2015-01-28 | 2019-10-11 | 南京农业大学 | A kind of big-power tractor hydraulic mechanical stepless gearbox |
| CN106202663B (en) * | 2016-06-30 | 2021-04-02 | 中国北方车辆研究所 | Electromechanical composite transmission power flow general analysis system and method |
| CN106438029A (en) * | 2016-11-16 | 2017-02-22 | 中车北京南口机械有限公司 | Power device of drilling machine and drilling machine |
| CN107387747A (en) * | 2017-09-06 | 2017-11-24 | 重庆青山工业有限责任公司 | The clutch fluid pressure control system of double-clutch automatic gearbox |
| CN108757916B (en) * | 2018-07-09 | 2023-07-11 | 湖南农业大学 | Automatic gear shifting control device of wheeled tractor and control method thereof |
| CN109185453A (en) * | 2018-09-27 | 2019-01-11 | 江苏大学 | A kind of hydraulic control system of stepless transmission wet clutch |
| CN109764123B (en) * | 2019-01-16 | 2021-06-22 | 江苏大学 | Multi-mode switching power transmission system with variable characteristic parameters of planetary gear |
| CN110822053B (en) * | 2019-10-08 | 2022-04-26 | 江苏大学 | Multi-power distribution mode mechanical-hydraulic composite transmission device and control method |
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