CN102062204B - Clutch hydraulic control device of double-clutch automatic transmission - Google Patents
Clutch hydraulic control device of double-clutch automatic transmission Download PDFInfo
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- CN102062204B CN102062204B CN201010546523.8A CN201010546523A CN102062204B CN 102062204 B CN102062204 B CN 102062204B CN 201010546523 A CN201010546523 A CN 201010546523A CN 102062204 B CN102062204 B CN 102062204B
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- 230000005540 biological transmission Effects 0.000 title abstract description 7
- 239000012530 fluid Substances 0.000 claims description 50
- 239000000945 filler Substances 0.000 claims description 33
- 239000002828 fuel tank Substances 0.000 claims description 33
- 230000009286 beneficial effect Effects 0.000 abstract 2
- 230000002265 prevention Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Control Of Transmission Device (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention provides a clutch hydraulic control device of a double-clutch automatic transmission, belonging to the technical field of automobile clutches. The clutch hydraulic control device is beneficial to the solution to the technical problem that in the prior art, the pressure-proportion solenoid valve is easy to put into two gears to cause an automobile to be destroyed while the pressure-proportion solenoid value has faults. The clutch hydraulic control device of the double-clutch automatic transmission comprises an oil tank, an oil pump, a pressure-proportion solenoid valve 1, a pressure-proportion solenoid valve 2 and a directional control valve 1, wherein oil outlets of the pressure-proportion solenoid valve 1 and the pressure-proportion solenoid valve 2 are respectively connected with a clutch 1 and a clutch 2 through the directional control valve 1; the directional control valve 1 is provided with an unloading port which is connected with the oil tank; an oil outlet of the oil pump is also connected with a pressure regulating unit which can regulate oil pressure at the oil outlet of the oil pump. The clutch hydraulic control device is beneficial to the prevention of the automobile from being destroyed because two gears are simultaneously put into, thereby ensuring that the safety of a double-clutch system is greatly improved.
Description
Technical field
The invention belongs to automotive transmission technical field, relate to a kind of double-clutch automatic gearbox, particularly a kind of clutch fluid pressure control device of double-clutch automatic gearbox.
Background technique
In today that automobile is day by day popular, automotive engineering development, the requirement of client to automobile is more and more stricter.Double-clutch automatic gearbox is accepted by market and client, and the pressure controling precision of clutch requires high, generally adopts pressure proportional solenoid valve to carry out clutch oil pressure-controlled at present.
A kind of double-clutch automatic gearbox gearshift hydraulic pressure installation disclosed in patent (CN101858431A), comprise the odd number shelves hydraulic control system be connected with clutch one and the even number shelves hydraulic control system be connected with clutch two, there is in odd number shelves hydraulic control system the odd number shelves selector valve that can switch fluid and flow to, there is in even number shelves hydraulic control system the even number shelves selector valve that can switch fluid and flow to, this device also comprises the control valve be simultaneously connected with even number shelves selector valve with above-mentioned odd number shelves selector valve, control valve can drive odd number shelves selector valve, even number shelves selector valve replaces.It is few that this double-clutch automatic gearbox shifting system has executive component, the advantage that cost is low.In general also the pressure that pressure proportional solenoid valve comes Precise Control of Oil road is increased in superincumbent oil circuit in existing technology.
But because pressure proportional solenoid valve itself has certain probability to break down; for ensureing when pressure proportional solenoid valve breaks down; avoid hanging up two gears causes automobile to damage simultaneously, and ensures that automobile normally can travel and goes home, and is very important to the safety protection of clutch.
As mentioned above, if do not add safety measure when designing clutch control, be then easy to hang up two gears, cause automobile to damage, when therefore must consider that pressure proportional solenoid valve breaks down, automobile normally can travel and go home.
Summary of the invention
The object of the invention is the problems referred to above existed for existing technology, a kind of clutch fluid pressure control device of reasonable in design, double-clutch automatic gearbox that Security is good is provided.
Object of the present invention realizes by following technical proposal: a kind of clutch fluid pressure control device of double-clutch automatic gearbox, comprise fuel tank, oil pump, pressure proportional solenoid valve one and pressure proportional solenoid valve two, fuel tank is connected with the filler opening of oil pump, the oil outlet of oil pump respectively with pressure proportional solenoid valve one, the filler opening of pressure proportional solenoid valve two is connected, it is characterized in that, this device also comprises a position control valve one, pressure proportional solenoid valve one, the oil outlet of pressure proportional solenoid valve two by this position control valve one respectively with clutch one, clutch two is connected, described position control valve one has the unloading port be connected with fuel tank, described position control valve one can make the power oil-duct through this place connect or make clutch one, the fluid of clutch two is through unloading port oil sump tank, the oil outlet of described oil pump is also connected with the pressure regulation unit that can regulate this place's oil pressure.
The working principle of this device is as follows: fluid is extracted out and formed power oil by oil pump from fuel tank, the oil pressure of pressure regulation unit to oil pump oil outlet place regulates, the oil pressure at this place is made to remain in certain scope, then fluid flows to the filler opening of pressure proportional solenoid valve one and pressure proportional solenoid valve two from the oil outlet of oil pump, flowed to two filler openings of position control valve one respectively by its oil outlet after the control of pressure proportional solenoid valve one and pressure proportional solenoid valve two, position control valve one inside have two independently oil circuit connect two oil outlets respectively, fluid flows to clutch one and clutch two respectively from two oil outlets of position control valve one.Under normal circumstances, position control valve one makes pressure proportional solenoid valve one, pressure proportional solenoid valve two be connected with clutch one, clutch two respectively, but after one of them pressure proportional solenoid valve breaks down, position control valve changes valve position for a moment, close its two filler openings, two oil outlets respectively with two unloading ports are connected, the fluid of such clutch one, clutch two is through the direct oil sump tank off-load of unloading port, and after off-load, clutch is in and shifting system disengaged position respectively once, clutch two.After clutch one and clutch two off-load totally, position control valve one changes valve position again makes the oil circuit between pressure proportional solenoid valve and clutch connect, because the corresponding gear of the clutch of a pressure proportional electromagnetic valve is thrown off, no matter this clutch is in combination or separated state, all transferring power is not on gear, and the shifting system of automobile travels with the low grade preset under the effect of another clutch.This apparatus design is reasonable, position control valve one is with the addition of in oil hydraulic circuit, automobile can also be made unaffected after one of them pressure proportional solenoid valve breaks down, and can continue to travel with low grade, avoid and hang up two gears simultaneously and cause automobile to damage, also can ensure that automobile normal running is gone home, and not be used in field and casts anchor, this makes the Security of double clutch system substantially increase simultaneously.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, also comprise a stop valve one, described position control valve one is leading type structure, the oil outlet of described oil pump is connected with the filler opening of stop valve one, and the oil outlet of described stop valve one is connected with guide's oil circuit of position control valve one.When stop valve one is in connection position, guide's oil circuit of position control valve one is communicated with the oil outlet of oil pump, position control valve one changes the oil circuit of valve position opening pressure proportional electromagnetic valve and clutch under the effect of the oil pressure on guide oil road, and the oil circuit in clutch one, clutch two is connected with fuel tank carry out off-load.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described stop valve one is electromagnetic type structure.The stop valve of electromagnetic type structure can receive the electrical signal of automotive check control gear transmission, can realize electric automatization and control.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described pressure regulation unit comprises the position control valve two that filler opening is connected with the oil outlet of oil pump, and the oil outlet of described position control valve two is communicated with fuel tank.When the oil pressure of the oil outlet of oil pump is too high, the oil circuit between the oil outlet of oil pump and fuel tank connected by position control valve two, makes the oil outlet off-load of oil pump.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described position control valve two is electromagnetic type structure.When position control valve two receives electrical signal, can be conjugated by the break-make changing the electromagnet of its inside.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described position control valve two is leading type structure, guide's hydraulic fluid port of described position control valve two is connected with the oil outlet of oil pump, this guide's hydraulic fluid port is also connected with the filler opening of a stop valve two, and the oil outlet of described stop valve two is connected with fuel tank.When stop valve two disconnects, the fluid at the oil outlet place of oil pump enters into guide's hydraulic fluid port of position control valve two, make position control valve two change valve position and the oil outlet of oil pump is communicated with off-load with fuel tank, when stop valve two is communicated with, fluid in guide's oil circuit of this position control valve two is through the off-load of stop valve two oil sump tank, and at this moment position control valve two makes the oil circuit between the oil outlet of oil pump and fuel tank disconnect.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described stop valve two is electromagnetic type structure.The stop valve two of electromagnetic type structure more easily controls.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, the oil circuit between described oil pump and fuel tank is provided with filter screen.The Main Function of filter screen filters the impurity in fluid, and fluid can bring a lot of impurity particles in the process of work cycle, and these impurity and particle can cause hydrovalve to produce fault once enter into hydrovalve.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, described pressure proportional solenoid valve one, oil circuit between the filler opening of pressure proportional solenoid valve two and the oil outlet of oil pump are equipped with filter screen.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, the oil circuit between two oil outlets of described position control valve one and clutch one, clutch two is provided with accumulator.The effect of accumulator is the oil pressure held stationary making this section of coupled oil circuit, and can increase the extra oil pressure of a part.
In the clutch fluid pressure control device of above-mentioned a kind of double-clutch automatic gearbox, the oil outlet of described oil pump is also connected with relief valve, described relief valve is connected with fuel tank.Relief valve can ensure that the oil pressure of the oil outlet of oil pump can not exceed maximum limit further.
Compared with prior art, this apparatus design is reasonable, position control valve one is with the addition of in oil hydraulic circuit, automobile can also be made unaffected after one of them pressure proportional solenoid valve breaks down, and can continue to travel with low grade, avoid and hang up two gears simultaneously and cause automobile to damage, while also can ensure that automobile normal running is gone home, not be used in field to cast anchor, this makes the Security of double clutch system substantially increase; On the filler opening of clutch, increase accumulator in addition, make the oil pressure held stationary of this section of coupled oil circuit, and the extra oil pressure of a part can be increased.
Accompanying drawing explanation
Fig. 1 is the clutch fluid pressure control device hydraulic principle schematic diagram of this double-clutch automatic gearbox.
In figure, 1, fuel tank; 2, oil pump; 3, pressure proportional solenoid valve one; 4, pressure proportional solenoid valve two; 5, position control valve one; 6, clutch one; 7, clutch two; 8, stop valve one; 9, position control valve two; 10, stop valve two; 11, filter screen; 12, relief valve; 13, accumulator; 14, cooling system; 15, shifting system.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, the automatic transmission of automobile comprises cooling system 14, shifting system 15.This hydraulic control device, comprise fuel tank 1, oil pump 2, pressure proportional solenoid valve 1 and pressure proportional solenoid valve 29, fuel tank 1 is connected with the filler opening of oil pump 2, the oil outlet of oil pump 2 is connected with the filler opening of pressure proportional solenoid valve 1, pressure proportional solenoid valve 24 respectively, the oil outlet of oil pump 2 is also connected with relief valve 12, and relief valve 12 is connected with fuel tank 1.Relief valve 12 can ensure that the oil pressure of the oil outlet of oil pump 2 can not exceed maximum limit further.This device also comprises a position control valve 1, position control valve 1 comprises two filler openings, two oil outlets and two unloading ports, pressure proportional solenoid valve 1, the oil outlet of pressure proportional solenoid valve 24 is connected with two filler openings of this position control valve 1 respectively, two oil outlets of position control valve 1 respectively with clutch 1, clutch 7 is connected, two filler openings can be made to be connected with the oil outlet of two oil pumps 2 respectively when position control valve 1 is positioned at left position, two oil outlets can be made to be connected with unloading port respectively when position control valve 1 is positioned at right position.Oil circuit between two oil outlets of position control valve 1 and clutch 1, clutch 7 is provided with accumulator 13.The effect of accumulator 13 makes this section of coupled oil circuit voltage regulation filtering.The oil outlet of oil pump 2 is also connected with the oil circuit of shifting system 15.
In the present embodiment, position control valve 1 is leading type structure, guide's hydraulic fluid port of this position control valve 1 is connected with the oil outlet of a stop valve 1, the oil outlet of oil pump 2 is connected with the filler opening of stop valve 1, when stop valve 1 is in connection position, guide's oil circuit of position control valve 1 is communicated with the oil outlet of oil pump 2, position control valve 1 is positioned at left position under the effect of the oil pressure on guide oil road, two filler opening is connected with oil outlet respectively, when stop valve 1 is in off state, guide's oil circuit is connected with the unloading port of stop valve 1, position control valve 1 gets back to right position under the effect of the return spring of self, its two oil outlets are connected with unloading port, and make clutch 1, oil circuit in clutch 27 is connected with fuel tank 1 and carries out off-load.Stop valve 1 is electromagnetic type structure in the present embodiment.The stop valve of electromagnetic type structure can receive the electrical signal of automotive check control gear transmission, can realize electric automatization and control.
The oil outlet of oil pump 2 is also connected with the pressure regulation unit that can regulate this place's oil pressure.Specifically, pressure regulation unit comprises the position control valve 29 that filler opening is connected with the oil outlet of oil pump 2, and the oil outlet of position control valve 29 is communicated with fuel tank 1.Position control valve 29 is leading type structure, and guide's hydraulic fluid port of position control valve 29 is connected with the oil outlet of oil pump 2, and this guide's hydraulic fluid port is also connected with the filler opening of a stop valve 10, and the oil outlet of stop valve 2 10 is connected with fuel tank 1.Guide's hydraulic fluid port of position control valve 29 is also connected with an accumulator 13.When stop valve 10 disconnects, the fluid at the oil outlet place of oil pump 2 enters into guide's hydraulic fluid port of position control valve 29, make position control valve 29 change valve position and the oil outlet of oil pump 2 is communicated with off-load with fuel tank 1, when stop valve 10 is communicated with, fluid in guide's oil circuit of this position control valve 9 is through the off-load of stop valve 10 oil sump tank 1, and at this moment position control valve 29 makes the oil circuit between the oil outlet of oil pump 2 and fuel tank 1 disconnect.In the present embodiment, stop valve 2 10 is electromagnetic type structure.The stop valve 2 10 of electromagnetic type structure more easily controls.
Oil circuit between oil pump 2 and fuel tank 1 is provided with filter screen 11.The Main Function of filter screen 11 filters the impurity in fluid, and fluid can bring a lot of impurity particles in the process of work cycle, and these impurity and particle can cause hydrovalve to produce fault once enter into hydrovalve.Oil circuit between the filler opening of pressure proportional solenoid valve 1, pressure proportional solenoid valve 24 and the oil outlet of oil pump 2 is equipped with filter screen 11.
The working principle of this device is as follows: fluid is extracted out and formed power oil by oil pump 2 from fuel tank 1, the oil pressure of pressure regulation unit to oil pump 2 oil outlet place regulates, the oil pressure at this place is made to remain in certain scope, then fluid flows to the filler opening of pressure proportional solenoid valve 1 and pressure proportional solenoid valve 24 from the oil outlet of oil pump 2, flowed to two filler openings of position control valve 1 respectively by its oil outlet after the process of pressure proportional solenoid valve 1 and pressure proportional solenoid valve 24, position control valve 1 inside have two independently oil circuit connect two oil outlets respectively, fluid flows to clutch 1 and clutch 27 respectively from two oil outlets of position control valve 1.Under normal circumstances, position control valve 1 makes pressure proportional solenoid valve 1, pressure proportional solenoid valve 24 be connected with clutch 1, clutch 27 respectively, but after one of them pressure proportional solenoid valve breaks down, position control valve 1 can change valve position, close its two filler openings, two oil outlets respectively with two unloading ports are connected, the fluid of such clutch 1, clutch 27 is through the off-load of unloading port direct oil sump tank 1, and after off-load, clutch 1, clutch 27 are just in and shifting system 15 disengaged position respectively.After clutch 1 and clutch 27 off-load totally, position control valve 1 changes valve position again makes the oil circuit between pressure proportional solenoid valve and clutch connect, because the corresponding gear of the clutch of a pressure proportional electromagnetic valve is thrown off, no matter this clutch is in combination or separated state, all transferring power is not on gear, and the shifting system 15 of automobile travels with the low grade preset under the effect of another clutch.This apparatus design is reasonable, position control valve 1 is with the addition of in oil hydraulic circuit, automobile can also be made unaffected after one of them pressure proportional solenoid valve breaks down, and can continue to travel with low grade, avoid and hang up two gears simultaneously and cause automobile to damage, also can ensure that automobile normal running is gone home, and not be used in field and casts anchor, this makes the Security of double clutch system substantially increase simultaneously.
Embodiment two:
The present embodiment general contents is identical with embodiment one, and institute's difference is, in the present embodiment, position control valve 1 and position control valve 29 are electromagnetic type structure, eliminate stop valve 1 and stop valve 2 10 in the present embodiment.When position control valve 1 and position control valve 29 receive electrical signal, can be conjugated by the break-make changing the electromagnet of its inside.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (4)
1. the clutch fluid pressure control device of a double-clutch automatic gearbox, comprise fuel tank (1), oil pump (2), pressure proportional solenoid valve one (3) and pressure proportional solenoid valve two (4), fuel tank (1) is connected with the filler opening of oil pump (2), the oil outlet of oil pump (2) respectively with pressure proportional solenoid valve one (3), the filler opening of pressure proportional solenoid valve two (4) is connected, it is characterized in that, this device also comprises a position control valve one (5), pressure proportional solenoid valve one (3), the oil outlet of pressure proportional solenoid valve two (4) by this position control valve one (5) respectively with clutch one (6), clutch two (7) is connected, described position control valve one (5) has the unloading port be connected with fuel tank (1), described position control valve one (5) can make the power oil-duct through this place connect or make clutch one (6), the fluid of clutch two (7) is through unloading port oil sump tank (1), the oil outlet of described oil pump (2) is also connected with the pressure regulation unit that can regulate this place's oil pressure, oil circuit between two oil outlets of described position control valve one (5) and clutch one (6), clutch two (7) is provided with accumulator (13), also comprise a stop valve one (8), described position control valve one (5) is leading type structure, the oil outlet of described oil pump (2) is connected with the filler opening of stop valve one (8), and the oil outlet of described stop valve one (8) is connected with guide's oil circuit of position control valve one (5), described stop valve one (8) is electromagnetic type structure, described pressure regulation unit comprises the position control valve two (9) that filler opening is connected with the oil outlet of oil pump (2), and the oil outlet of described position control valve two (9) is communicated with fuel tank (1), described position control valve two (9) is electromagnetic type structure.
2. the clutch fluid pressure control device of a double-clutch automatic gearbox, comprise fuel tank (1), oil pump (2), pressure proportional solenoid valve one (3) and pressure proportional solenoid valve two (4), fuel tank (1) is connected with the filler opening of oil pump (2), the oil outlet of oil pump (2) respectively with pressure proportional solenoid valve one (3), the filler opening of pressure proportional solenoid valve two (4) is connected, it is characterized in that, this device also comprises a position control valve one (5), pressure proportional solenoid valve one (3), the oil outlet of pressure proportional solenoid valve two (4) by this position control valve one (5) respectively with clutch one (6), clutch two (7) is connected, described position control valve one (5) has the unloading port be connected with fuel tank (1), described position control valve one (5) can make the power oil-duct through this place connect or make clutch one (6), the fluid of clutch two (7) is through unloading port oil sump tank (1), the oil outlet of described oil pump (2) is also connected with the pressure regulation unit that can regulate this place's oil pressure, oil circuit between two oil outlets of described position control valve one (5) and clutch one (6), clutch two (7) is provided with accumulator (13), also comprise a stop valve one (8), described position control valve one (5) is leading type structure, the oil outlet of described oil pump (2) is connected with the filler opening of stop valve one (8), and the oil outlet of described stop valve one (8) is connected with guide's oil circuit of position control valve one (5), described stop valve one (8) is electromagnetic type structure, described pressure regulation unit comprises the position control valve two (9) that filler opening is connected with the oil outlet of oil pump (2), and the oil outlet of described position control valve two (9) is communicated with fuel tank (1), described position control valve two (9) is leading type structure, guide's hydraulic fluid port of described position control valve two (9) is connected with the oil outlet of oil pump (2), this guide's hydraulic fluid port is also connected with the filler opening of a stop valve two (10), and the oil outlet of described stop valve two (10) is connected with fuel tank (1), described stop valve two (10) is electromagnetic type structure.
3. the clutch fluid pressure control device of a kind of double-clutch automatic gearbox according to claim 1 and 2, is characterized in that, the oil circuit between described oil pump (2) and fuel tank (1) is provided with filter screen (11).
4. the clutch fluid pressure control device of a kind of double-clutch automatic gearbox according to claim 1 and 2, it is characterized in that, described pressure proportional solenoid valve one (3), oil circuit between the filler opening of pressure proportional solenoid valve two (4) and the oil outlet of oil pump (2) are equipped with filter screen (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010546523.8A CN102062204B (en) | 2010-11-16 | 2010-11-16 | Clutch hydraulic control device of double-clutch automatic transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010546523.8A CN102062204B (en) | 2010-11-16 | 2010-11-16 | Clutch hydraulic control device of double-clutch automatic transmission |
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| CN102062204A CN102062204A (en) | 2011-05-18 |
| CN102062204B true CN102062204B (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010546523.8A Expired - Fee Related CN102062204B (en) | 2010-11-16 | 2010-11-16 | Clutch hydraulic control device of double-clutch automatic transmission |
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| CN102927160A (en) * | 2012-10-28 | 2013-02-13 | 贵州凯星液力传动机械有限公司 | Clutch oil pressure control system of hydrodynamic transmission |
| DE102013008701B3 (en) | 2013-05-22 | 2014-10-09 | Audi Ag | Method for operating a transmission device and corresponding transmission device |
| CN105156508B (en) * | 2015-07-14 | 2017-06-09 | 北京信息科技大学 | A kind of wet clutch buffer control method and control system |
| EP3368798A4 (en) * | 2015-10-27 | 2019-07-10 | Borgwarner Inc. | Automated manual transmission clutch with accumulator |
| CN106678357B (en) * | 2017-01-22 | 2018-03-16 | 北京航空航天大学 | A kind of pure electric automobile two-shift automatic speed variator hydraulic system |
| CN109114217A (en) * | 2017-06-22 | 2019-01-01 | 内蒙古欧意德发动机有限公司 | Shift hydraulic control system, speed changer and automobile |
| CN107763198A (en) * | 2017-10-13 | 2018-03-06 | 南京农业大学 | Double planet wheel rows of mixing confluxes the clutch fluid pressure control system of hydraulic mechanical stepless gearbox |
| CN108131401B (en) * | 2018-01-16 | 2024-04-26 | 联合汽车电子有限公司 | Hydraulic control system and control method of clutch |
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| CN102062204A (en) | 2011-05-18 |
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