CN102897157A - Automobile anti-skid braking system with energy recovery function - Google Patents
Automobile anti-skid braking system with energy recovery function Download PDFInfo
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- CN102897157A CN102897157A CN2012103721648A CN201210372164A CN102897157A CN 102897157 A CN102897157 A CN 102897157A CN 2012103721648 A CN2012103721648 A CN 2012103721648A CN 201210372164 A CN201210372164 A CN 201210372164A CN 102897157 A CN102897157 A CN 102897157A
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- valve
- brake cylinder
- pressure accumulator
- wheel brake
- liquid
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
- B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
- B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
- B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
Abstract
The invention discloses an automobile anti-skid braking system with an energy recovery function. A brake master cylinder has two oil ways, wherein a first oil way is connected with a driven wheel brake wheel cylinder by virtue of a first liquid inlet valve and connected with a driving wheel brake wheel cylinder by virtue of a second liquid inlet valve; the driven wheel brake wheel cylinder connected with a first liquid outlet valve and the driving wheel brake wheel cylinder connected with a second liquid outlet valve are connected with a low-pressure accumulator; the low-voltage accumulator is divided into two ways after passing through a non-return valve, one way passing through a middle-pressure accumulator and a normally closed isolation valve and the other way passing through the non-return valve and a damper in an oil return pump are connected with the brake master cylinder; two ends of the second liquid inlet valve are parallelly connected with an electric-control pressure limiting valve; and after being connected with a pressure sensor, the second oil way has a connection mode which is the same as that of the first oil way. The automobile anti-skid braking system is provided with an energy recovery functional component used for recovery energy during a braking process; and on the basis of automobile anti-skid braking system development, the automobile anti-skid braking system not only has an anti-skid braking function, but also has an energy recovery function.
Description
Technical field
The present invention relates to a kind of automobile anti-lock braking brake equipment, particularly a kind of automobile anti-lock braking brake equipment that energy recovery function is arranged.
Background technology
Implement in China to have caused the upsurge of greatly developing the new forms of energy car after a series of sustainable development behaves such as energy-saving and emission-reduction, protection of the environment.2010, management level were listed the new-energy automobile industry in national seven great strategy new industries.The deployment of national strategy aspect has excited people to open up the enthusiasm of new-energy automobile industry especially.Flourish along with the new-energy automobile industry, associated industry-by-industry technology has also proposed Secretary.
High-capacity storage battery, the widespread use of motor (electrical generator) on the new forms of energy car, the energy of new-energy automobile in braking procedure reclaimed becomes possibility.Traditional anti-lock brake system (ABS) can only have outstanding behaviours aspect automobile braking safety, then be blank out participating in aspect the energy recovery function.Therefore how under the prerequisite that guarantees automobile braking safety, the energy that makes brake system can participate in automobile reclaims and makes that the braking of automobile is more comfortable to become new problem in the brake system.In this case, a kind of have the automobile anti-lock braking brake equipment (EABS) of energy recovery function to arise at the historic moment.
Summary of the invention
Deficiency for existing anti-lock brake system (ABS) the object of the present invention is to provide a kind of a kind of automobile anti-lock braking brake equipment that energy recovery function is arranged that can be applied on the new-energy automobile.
In order to solve above-mentioned purpose, the technical solution used in the present invention is as follows:
It comprises master brake cylinder the present invention, two dampers, dump pump drive motor, two dump pumps, four liquid feed valves, four liquid valve unit, two low pressure accumulators, two flower wheel brake cylinders, two drive wheel brake cylinders; Master brake cylinder has two oil circuits: the first oil circuit is connected with the first flower wheel brake cylinder by the first liquid feed valve, the first oil circuit is connected with the first drive wheel brake cylinder by the second liquid feed valve, after the first flower wheel brake cylinder is connected with the first liquid valve and be connected the drive wheel brake cylinder and be connected with the second liquid valve and all be connected with the first low pressure accumulator afterwards, the check valve that the first low pressure accumulator connects the first dump pump inside is connected with master brake cylinder behind the damper with being connected; The second oil circuit is connected with the second drive wheel brake cylinder by the 3rd liquid feed valve, the second oil circuit is connected with the second flower wheel brake cylinder by the 4th liquid feed valve, after the second flower wheel brake cylinder is connected with the 4th liquid valve and be connected the drive wheel brake cylinder and be connected with the 3rd liquid valve and all be connected with the second low pressure accumulator afterwards, the check valve that the second low pressure accumulator connects the second dump pump inside is connected with master brake cylinder behind the damper with being connected.
The present invention is divided into two-way after also connecing the first check valve between the first low pressure accumulator in the first oil circuit and the first dump pump, one the tunnel through the first intermediate-pressure accumulator be connected normally closed disconnecting valve and be connected with master brake cylinder, another road is connected with master brake cylinder behind the damper with being connected through the check valve of the first dump pump inside, at the two ends of the second liquid feed valve and connect the first automatically controlled limiting valve; Be divided into two-way after connecing the second check valve between the second low pressure accumulator in the second oil circuit and the second dump pump, one the tunnel through the second intermediate-pressure accumulator be connected normally closed disconnecting valve and be connected with master brake cylinder, another road is connected with master brake cylinder behind the damper with being connected through the check valve of the second dump pump inside, at the two ends of the 3rd liquid feed valve and connect the second automatically controlled limiting valve; Connect pressure sensor at master brake cylinder the second oil circuit mouth.
The beneficial effect that the present invention has is:
Join in the electromagnetic valve of automobile anti-lock braking brake equipment by some and energy are reclaimed relevant parts, make the drive wheel of automobile in braking procedure, carry out first the generating work of electrical generator.Satisfy fully in the situation of brake request in the required moment of the generating of electrical generator, the braking of automobile is finished jointly by the generator brake of drive wheel and the conventional brake of flower wheel.The lock torque that electrical generator produces in power generation process, its equivalent braking liquid will not remove drg, and be stored by electromagnetic valve.Can not satisfy in the situation of brake request in the required moment of the generating of electrical generator, the braking of the drive wheel of automobile will be finished jointly by electrical generator and drg, and flower wheel is still finished by conventional brake.This braking is combined with the height that energy reclaims, and has the comfortable advantage with reducing waste of power of brake safe.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of EABS electromagnetic valve.
Fig. 2 is the hydraulic figure of EABS electromagnetic valve when drive wheel is finished braking by electrical generator separately.
Fig. 3 is the EABS electromagnetic valve is finished braking jointly by electrical generator and drg at drive wheel hydraulic figure.
Fig. 4 is EABS switches to ABS (Anti-lock Braking System) when energy recovery state hydraulic figure.
Fig. 5 is the outside drawing of EABS electromagnetic valve.
Fig. 6 is the cutaway view of EABS low pressure accumulator and check valve.
Among the figure: 1. master brake cylinder, 2. pressure sensor, 3. normally closed closing valve unit, 301,302. normally closed disconnecting valve, 4. intermediate-pressure accumulator unit, 401,402. intermediate-pressure accumulator, 501,502. damper, 6. dump pump drive motor, 7. dump pump unit, 701,702. dump pump, 8. liquid feed valve unit, 801,802,803,804. liquid feed valve, 9. liquid valve unit, 901,902,903,904. liquid valve, 10. low pressure accumulator unit, 1001,1002. low pressure accumulator, 11. check valve unit, 1101,1102. check valve, 1201,1204. flower wheel brake cylinder, 1202,1203. the drive wheel brake cylinder, 13. valve bodies, 14. mounting screws.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, it comprises master brake cylinder 1 the present invention, two dampers 501,502, dump pump drive motor 6, two dump pumps 701,702, four liquid feed valves 801,802,803,804, four liquid valve unit 901,902,903,904, two low pressure accumulators 1001,1002, two flower wheel brake cylinders 1201,1204, two drive wheel brake cylinders 1202,1203; Master brake cylinder 1 has two oil circuits: the first oil circuit is connected with the first flower wheel brake cylinder 1201 by the first liquid feed valve 801, the first oil circuit is connected with the first drive wheel brake cylinder 1202 by the second liquid feed valve 802, after the first flower wheel brake cylinder 1201 is connected with the first liquid valve 901 and be connected drive wheel brake cylinder 1202 and be connected with the second liquid valve 902 and all be connected with the first low pressure accumulator 1001 afterwards, the check valve that the first low pressure accumulator 1001 connects the first dump pump 701 inside be connected damper 501 and be connected with master brake cylinder 1 afterwards; The second oil circuit is connected with the second drive wheel brake cylinder 1203 by the 3rd liquid feed valve 803, the second oil circuit is connected with the second flower wheel brake cylinder 1204 by the 4th liquid feed valve 804, after the second flower wheel brake cylinder 1204 is connected with the 4th liquid valve 904 and be connected drive wheel brake cylinder 1203 and be connected with the 3rd liquid valve 903 and all be connected with the second low pressure accumulator 1002 afterwards, the check valve that the second low pressure accumulator 1002 connects the second dump pump 702 inside be connected damper 502 and be connected with master brake cylinder 1 afterwards.
The present invention is divided into two-way after also being included in and connecing the first check valve 1101 between the first low pressure accumulator 1001 in the first oil circuit and the first dump pump 701, one the tunnel through the first intermediate-pressure accumulator 401 be connected normally closed disconnecting valve 301 and be connected with master brake cylinder 1, another road is connected with master brake cylinder 1 behind the damper 501 with being connected through the check valve of the first dump pump 701 inside, at the two ends of the second liquid feed valve 802 and connect the first automatically controlled limiting valve; Be divided into two-way after connecing the second check valve 1102 between the second low pressure accumulator 1002 in the second oil circuit and the second dump pump 702, one the tunnel through the second intermediate-pressure accumulator 402 be connected normally closed disconnecting valve 302 and be connected with master brake cylinder 1, another road is connected with master brake cylinder 1 behind the damper 502 with being connected through the check valve of the second dump pump 702 inside, at the two ends of the 3rd liquid feed valve 803 and connect the second automatically controlled limiting valve; Connect pressure sensor 2 at master brake cylinder 1 second oil circuit mouth.
The low pressure accumulator that the present invention mentions and intermediate-pressure accumulator only are with the working pressure range of energy storage energy storage to be distinguished, and wherein the working pressure range of low pressure accumulator is: 0.2～0.6MPa; The working pressure range of intermediate-pressure accumulator is: 0.6～6MPa.
Fig. 1 is the hydraulic schematic diagram of EABS.On the basis of automobile anti-lock braking brake equipment (ABS), EABS has increased pressure sensor 2, two normally closed disconnecting valves 301,302, two intermediate-pressure accumulators 401,402, two check valves 1101,1102 and two automatically controlled limiting valves as seen from Figure 1.The increase of above-mentioned functions parts, its purpose are the new forms of energy car in carrying out the energy removal process, and the braking liquid corresponding with the lock torque of electrical generator generation will not enter brake cylinder, and be stored by the EABS electromagnetic valve.
Fig. 2 is the hydraulic figure of EABS electromagnetic valve when drive wheel is finished braking by electrical generator separately.Under this state, drive wheel is finished braking and can be satisfied brake request by electrical generator separately.As seen from Figure 2, in the car brakeing process, the control coil of liquid feed valve 802,803 is led to the electric current of constant value, and liquid feed valve 802 under the effect of electromagnetic attraction, 803 close, and the electromagnetic attraction that the hydraulic coupling that master brake cylinder 1 produces produces liquid feed valve 802,803 less than coil all the time, automatically controlled limiting valve cuts out, the braking liquid of master brake cylinder 1 does not go drive wheel 1202,1203 to carry out hydraulic braking.And will flowing to respectively intermediate-pressure accumulator 401,402 by the normally closed disconnecting valve 301,302 of opening, stores its equivalent braking liquid of the lock torque that electrical generator produces in power generation process.And flower wheel 1201,1204 carries out conventional brake by the braking liquid that master brake cylinder 1 flows out.Thick line partly represents the flow direction of the braking liquid in the Motor Vehicle Braking Procedure among the figure.
Fig. 3 is the EABS electromagnetic valve is finished braking jointly by electrical generator and drg at drive wheel hydraulic figure.Under this state, the generator brake of drive wheel can not satisfy the brake request of car load.As seen from Figure 3, in the car brakeing process, the control coil of liquid feed valve 802,803 is led to the electric current of constant value, liquid feed valve 802 under the effect of electromagnetic attraction, 803 close, along with improving constantly of vehicle braking force, the hydraulic coupling that produces when master brake cylinder 1 greater than coil to liquid feed valve 802,803 electromagnetic attractions that produce, cause automatically controlled limiting valve to be opened, the braking liquid of master brake cylinder 1 begins to add to drive wheel 1202,1203 and produces hydraulic braking.Automobile driving wheel is finished jointly by the hydraulic braking of electrical generator and drg.Drive wheel 1202,1203 braking liquid is through after replenishing, hydraulic coupling and drive wheel 1202 that master brake cylinder 1 produces, the electromagnetic attraction rebalancing that the difference of pressure of the hydraulic coupling of 1203 interior generations and coil produce liquid feed valve 802,803, liquid feed valve 802,803 close, automatically controlled limiting valve cuts out again, and this moment, the brake-pressure of drive wheel 1202,1203 was in a stabilized conditions.When car brakeing had higher required braking force, balance was broken again, repeated above-mentioned process until reach a new balance.The brake fluid pressure that master brake cylinder 1 produces is all the time under the monitoring of pressure sensor 2, the brake pressure value that produces when master brake cylinder 1 is greater than certain setting value (force value of this setting is not more than the voltage limiting value of automatically controlled limiting valve), normally closed disconnecting valve 301,302 are in closed condition again, the braking liquid that is stored in advance intermediate-pressure accumulator 401,402 will be stayed the inside.And flower wheel 1201,1204 still carries out conventional brake by the braking liquid that master brake cylinder 1 flows out.Thick line partly represents the flow direction of the braking liquid in the Motor Vehicle Braking Procedure among the figure.
Fig. 4 is EABS switches to ABS (Anti-lock Braking System) when energy recovery state hydraulic figure.As seen from Figure 4: when locking or locking trend appear in wheel, all electromagnetic valves are all got back to initial condition, it needs to be noted under this state, liquid feed valve 802, the liquid feed valve coil of 803 correspondences is energising not, therefore liquid feed valve 802,803 under this state with pressure-limiting function useless.Electrical generator stops generating, and gives the dump pump drive motor 6 energisings.At this moment the braking liquid that is stored in intermediate-pressure accumulator passes through the braking that dump pump 701,702 is got back to master brake cylinder 1 and participated in automobile.Under this state, automobile will be finished braking by drg fully, and EABS can carry out conventional ABS (Anti-lock Braking System) to be regulated.Thick line partly represents the flow direction of the braking liquid in the Motor Vehicle Braking Procedure among the figure.
Fig. 5 is the outside drawing of EABS electromagnetic valve.As seen from Figure 5, pressure sensor 2, normally closed closing valve unit 3, dump pump unit 7, liquid feed valve unit 8, liquid valve unit 9 all are installed in the valve body 13 corresponding mounting holes and riveting.Dump pump drive motor 6 is fixed on the valve body 13 by mounting screw 14.Intermediate-pressure accumulator unit 4, low pressure accumulator unit 10 all are integrated in the valve body 13.And in valve body, beat each auxiliary hole to realize the function connection between each functional unit.Also has and master brake cylinder 1 and flower wheel brake cylinder 1201,1204 mounting hole that drive wheel brake cylinder 1202 .1203 connect on the valve body.
Fig. 6 is the cutaway view of EABS low pressure accumulator and check valve.As seen from Figure 6, low pressure accumulator 10 is comprised of piston, seal ring, spring, blanking cover and back-up ring, and they are installed in the valve body 13, in the bottom of valve body 13 low pressure accumulator mounting holes check valve is arranged, they are made of one-way valve seat, steel ball and spring, and riveting is on valve body.
The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (1)
1. automobile anti-lock braking brake equipment that energy recovery function is arranged, it comprises master brake cylinder (1), two dampers (501,502), dump pump drive motor (6), two dump pumps (701,702), four liquid feed valves (801,802,803,804), four liquid valve unit (901,902,903,904), two low pressure accumulators (1001,1002), two flower wheel brake cylinders (1201,1204), two drive wheel brake cylinders (1202,1203); Master brake cylinder (1) has two oil circuits: the first oil circuit is connected with the first flower wheel brake cylinder (1201) by the first liquid feed valve (801), the first oil circuit is connected with the first drive wheel brake cylinder (1202) by the second liquid feed valve (802), after the first flower wheel brake cylinder (1201) is connected with the first liquid valve (901) and be connected drive wheel brake cylinder (1202) and be connected with the second liquid valve (902) and all be connected with the first low pressure accumulator (1001) afterwards, the check valve that the first low pressure accumulator (1001) connects the first dump pump (701) inside is connected with master brake cylinder (1) behind the damper (501) with being connected; The second oil circuit is connected with the second drive wheel brake cylinder (1203) by the 3rd liquid feed valve (803), the second oil circuit is connected with the second flower wheel brake cylinder (1204) by the 4th liquid feed valve (804), after the second flower wheel brake cylinder (1204) is connected with the 4th liquid valve (904) and be connected drive wheel brake cylinder (1203) and be connected with the 3rd liquid valve (903) and all be connected with the second low pressure accumulator (1002) afterwards, the check valve that the second low pressure accumulator (1002) connects the second dump pump (702) inside is connected with master brake cylinder (1) behind the damper (502) with being connected;
It is characterized in that:
Be divided into two-way after connecing the first check valve (1101) between the first low pressure accumulator (1001) in the first oil circuit and the first dump pump (701), one the tunnel through the first intermediate-pressure accumulator (401) be connected normally closed disconnecting valve (301) and be connected with master brake cylinder (1), another road is connected with master brake cylinder (1) behind the damper (501) with being connected through the inner check valve of the first dump pump (701), at the two ends of the second liquid feed valve (802) and connect the first automatically controlled limiting valve; Be divided into two-way after connecing the second check valve (1102) between the second low pressure accumulator (1002) in the second oil circuit and the second dump pump (702), one the tunnel through the second intermediate-pressure accumulator (402) be connected normally closed disconnecting valve (302) and be connected with master brake cylinder (1), another road is connected with master brake cylinder (1) behind the damper (502) with being connected through the inner check valve of the second dump pump (702), at the two ends of the 3rd liquid feed valve (803) and connect the second automatically controlled limiting valve; Connect pressure sensor (2) at master brake cylinder (1) second oil circuit mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103721648A CN102897157A (en) | 2012-09-29 | 2012-09-29 | Automobile anti-skid braking system with energy recovery function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103721648A CN102897157A (en) | 2012-09-29 | 2012-09-29 | Automobile anti-skid braking system with energy recovery function |
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| CN102897157A true CN102897157A (en) | 2013-01-30 |
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| CN2012103721648A Pending CN102897157A (en) | 2012-09-29 | 2012-09-29 | Automobile anti-skid braking system with energy recovery function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104442767A (en) * | 2014-12-23 | 2015-03-25 | 清华大学 | Hydraulic braking system having energy feedback and ESP functions and control method of hydraulic braking system |
| CN110203184A (en) * | 2019-05-06 | 2019-09-06 | 万向钱潮股份有限公司 | A kind of ABS hydraulic block for electric automobile energy recycling |
| CN110425245A (en) * | 2019-07-22 | 2019-11-08 | 成都博仕腾科技有限公司 | A kind of rolling stock half active oil-pressure damper of double oil circuits switching regulator adaptive damping |
| CN113247030A (en) * | 2021-05-19 | 2021-08-13 | 中车青岛四方机车车辆股份有限公司 | Electromechanical-hydraulic integrated system for carriage active height adjustment and railway vehicle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104442767A (en) * | 2014-12-23 | 2015-03-25 | 清华大学 | Hydraulic braking system having energy feedback and ESP functions and control method of hydraulic braking system |
| CN104442767B (en) * | 2014-12-23 | 2017-01-18 | 清华大学 | Hydraulic braking system having energy feedback and ESP functions and control method of hydraulic braking system |
| CN110203184A (en) * | 2019-05-06 | 2019-09-06 | 万向钱潮股份有限公司 | A kind of ABS hydraulic block for electric automobile energy recycling |
| CN110425245A (en) * | 2019-07-22 | 2019-11-08 | 成都博仕腾科技有限公司 | A kind of rolling stock half active oil-pressure damper of double oil circuits switching regulator adaptive damping |
| CN113247030A (en) * | 2021-05-19 | 2021-08-13 | 中车青岛四方机车车辆股份有限公司 | Electromechanical-hydraulic integrated system for carriage active height adjustment and railway vehicle |
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Application publication date: 20130130 |