CN113911088A - Vehicle pneumatic parking brake control system and control method - Google Patents
Vehicle pneumatic parking brake control system and control method Download PDFInfo
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- CN113911088A CN113911088A CN202111239366.0A CN202111239366A CN113911088A CN 113911088 A CN113911088 A CN 113911088A CN 202111239366 A CN202111239366 A CN 202111239366A CN 113911088 A CN113911088 A CN 113911088A
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- parking brake
- air
- hydraulic
- proportional valve
- pressure
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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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S9/00—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks
- B60S9/02—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for only lifting or supporting
- B60S9/10—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for only lifting or supporting by fluid pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a vehicle pneumatic parking brake control system which comprises an air source system, a pneumatic parking brake loop and a hydraulic support device, wherein the parking brake pneumatic loop comprises a parking control handle, a proportional valve and a parking brake air chamber, the hydraulic support device comprises a hydraulic cylinder body, a hydraulic support leg and a hydraulic loop, the hydraulic loop is fixed below a vehicle chassis and comprises a pressure sensor, and the proportional valve is connected with the hydraulic support leg through a transmission mechanism or is in communication connection with the pressure sensor through a driving mechanism. When the parking control handle is operated to release the parking brake, the motor controller acquires the oil pressure of the hydraulic loop, controls the driving motor to drive the swing rod to move according to the oil pressure of the hydraulic loop, and controls the air inlet and air outlet pressure ratio of the proportional valve through the stroke of the swing rod. The invention can improve the safety when the parking brake is released.
Description
Technical Field
The invention relates to the technical field of vehicle parking control, in particular to a vehicle pneumatic parking brake control system and a control method.
Background
The special vehicle with various operation tops and the special vehicle with a crane device have the faults that the vehicle is unstable and even overturns due to axle load transfer and vehicle gravity center change during the top loading operation, and the vehicle is generally provided with hydraulic support legs for supporting. The hydraulic supporting leg can stretch out and draw back, puts down the supporting leg when using, does not pack up the supporting leg simultaneously. Traditional hydraulic support leg, because the vehicle does not have linkage function with the supporting leg, when the supporting leg was put down and is not received up, the driver directly removed the parking easily and drives after to bring driver and crew and vehicle safety problem.
Chinese patent CN201711367234X discloses a telescopic supporting leg structure of a vehicle chassis, which is driven by a telescopic cylinder, and the supporting leg is fixed on the ground in a matching manner of an extended state and a stationary hoe, so as to support the vehicle. This structure belongs to traditional hydraulic support leg, and there is not the correlation effect with the vehicle parking, when the supporting leg was put down not to be packed up, the driver was driven after directly relieving the parking easily to bring driver and crew and vehicle safety problem. The scheme does not relate to the parking linkage structure and principle of the vehicle and the supporting legs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a vehicle air pressure parking brake control system and a control method, which can control the air pressure of a parking brake air chamber when a hydraulic support device is not completely retracted, so that the potential safety hazard caused by vehicle walking after parking brake is relieved.
In order to achieve the purpose, the invention provides a vehicle air pressure parking brake control system which comprises an air source system, an air pressure parking brake loop and a hydraulic support device, wherein the parking brake air pressure loop comprises a parking control handle, a proportional valve and a parking brake air chamber which are sequentially connected with an air outlet of the air source system, the proportional valve is used for adjusting the air inlet and air outlet pressure ratio of the proportional valve, the hydraulic support device comprises a hydraulic cylinder body fixed below a vehicle chassis, a hydraulic support leg and a hydraulic loop, the hydraulic support leg and the hydraulic loop stretch and move relative to the hydraulic cylinder body, the hydraulic loop comprises a pressure sensor, and the proportional valve is connected with the hydraulic support leg through a transmission mechanism or is in communication connection with the pressure sensor through a driving mechanism.
Further, the proportional valve includes the pendulum rod, pendulum rod fixedly connected with cam, the cam is connected with the one end butt of tappet, the other end and the piston of tappet are connected.
Furthermore, the transmission mechanism comprises a wire drawing, two ends of the wire drawing are respectively connected with the swing rod and the hydraulic supporting leg, and a spring is arranged in the middle of the wire drawing.
Further, the air inlet-outlet pressure ratio of the proportional valve is increased along with the increase of the expansion amount of the hydraulic supporting leg.
Furthermore, the driving mechanism comprises a motor controller and a driving motor, the motor controller is in communication connection with the pressure sensor, and the driving motor is used for driving the swing rod to swing.
Further, the motor controller is used for obtaining the oil pressure of the hydraulic circuit, and when the oil pressure of the hydraulic circuit is increased, the motor is controlled to drive the swing rod to swing, so that the air inlet-outlet pressure ratio of the proportional valve is increased.
Further, air source system is including the air compressor, air handling unit and the parking air receiver that connect gradually, the gas outlet of parking air receiver with parking brake lever connects.
The invention also provides a control method based on the vehicle pneumatic parking brake control system, when the parking brake is released by operating the parking control handle, the motor controller acquires the oil pressure of the hydraulic loop, controls the driving motor to drive the swing rod to move according to the oil pressure of the hydraulic loop, and controls the air inlet and air outlet pressure ratio of the proportional valve through the stroke of the swing rod.
Further, when the oil pressure of the hydraulic circuit is increased, the motor controller controls the driving motor to drive the swing rod to swing, so that the air inlet-outlet pressure ratio of the proportional valve is increased.
Further, when the oil pressure of the hydraulic circuit is greater than or equal to a first oil pressure, the driving motor is controlled to drive the swing rod to swing, the air inlet and air outlet pressure ratio of the proportional valve is made to be equal to the first pressure ratio, the first pressure ratio is greater than 1, when the oil pressure of the hydraulic circuit is less than or equal to a second oil pressure, the driving motor is controlled to drive the swing rod to swing, the air inlet and air outlet pressure ratio of the proportional valve is made to be equal to 1, and the first oil pressure is greater than the second oil pressure.
Further, the first oil pressure is the oil pressure when the extension amount of the hydraulic support leg is maximum, and the second oil pressure is the oil pressure when the extension amount of the hydraulic support leg is 0.
The invention has the beneficial effects that: the safety when the parking brake is released is improved. When the parking brake handle is operated to release the parking brake, if the hydraulic support device is not folded, the pressure ratio of air inlet and air outlet of the proportional valve is increased through the transmission mechanism and the driving mechanism, so that the pressure of the parking brake air chamber is reduced, the parking brake air chamber cannot provide enough force to completely release the parking brake, the larger the extension amount of the hydraulic support leg is, the smaller the pressure of the parking brake air chamber is, the more the parking brake cannot be released, and the safety of a vehicle when the parking brake is removed is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a control system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control system according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a proportional valve.
Fig. 4 is a schematic view of the installation position of the hydraulic support device.
The components in the figures are numbered as follows: the parking control device comprises a parking control handle 201, a proportional valve 202, a parking brake air chamber 203, a swing rod 204, a cam 205, a tappet 206, a piston 207, a diaphragm 208, an air inlet chamber 209, an air outlet chamber 210, a hydraulic cylinder 301, a hydraulic supporting leg 302, a hydraulic circuit 303, a pressure sensor 304, a drawing wire 401, a spring 402, a motor controller 501 and a control driving motor 502.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
Example 1:
as shown in figure 1, the vehicle air pressure parking brake control system comprises an air source system, an air pressure parking brake loop and a hydraulic support device, wherein the parking brake air pressure loop comprises a parking control handle 201, a proportional valve 202 and a parking brake air chamber 203 which are sequentially connected with an air outlet of the air source system, the parking brake air chamber 204 is connected with the parking brake device, the hydraulic support device comprises a hydraulic cylinder 301 fixed below a vehicle chassis, a hydraulic support leg 302 which moves relative to the hydraulic cylinder 301 in a telescopic mode and a hydraulic loop 303, the hydraulic loop 303 comprises a pressure sensor 304, and the proportional valve 202 is connected with the hydraulic support leg 302 through a transmission mechanism. The transmission mechanism comprises a drawing wire 401, two ends of the drawing wire 401 are respectively connected with the swing rod 204 and the hydraulic supporting leg 302, and a spring 402 is arranged in the middle of the drawing wire 401.
When the parking control handle is in a parking state, the parking brake air pressure loop is cut off, the air pressure of the parking brake air chamber is 0, the force for releasing the parking brake cannot be provided, the vehicle is completely in the parking brake state, when the parking brake handle is in the parking release state, the parking brake air pressure loop is completely opened, when the recent air outlet pressure ratio of the proportional valve is 1:1, the air pressure of the parking brake air chamber is the air outlet pressure of the air source system, and the pressure can completely release the parking brake. The spring avoids direct rigid connection between the hydraulic supporting leg and the swing rod in the wire drawing, avoids sudden change fluctuation of the swing rod caused by sudden change fluctuation of the stroke of the hydraulic supporting leg, and avoids sudden change fluctuation of air pressure of the parking brake air chamber.
The proportional valve 202 is a load-sensing proportional valve and comprises a swing rod 204, a cam 205 is fixedly connected to the swing rod 204, the cam 205 is abutted against one end of a tappet 206, the other end of the tappet 206 is connected with a piston 207, the piston 207 is connected with a diaphragm 208, the diaphragm 208 is located between an air inlet chamber 209 and an air outlet chamber 210, and the movement of the diaphragm 208 changes the volume ratio of the air inlet chamber 209 to the air outlet chamber 210, so that the air inlet-outlet pressure ratio of the proportional valve 202 is changed. Particularly, when the hydraulic support leg stretches out downwards, drive pendulum rod downstream, the pendulum rod drives the cam and rotates, makes tappet upward movement, drives the diaphragm upward movement through the piston for the air inlet chamber reduces with the volume ratio of giving vent to anger the room, thereby the pressure ratio of admitting air and giving vent to anger of increase proportional valve has reduced the atmospheric pressure in parking brake air chamber 203, reduces and knows the power of removing parking brake.
The air source system comprises an air compressor 101, an air processing unit 102 and a parking air cylinder 103 which are sequentially connected, and an air outlet of the parking air cylinder 103 is connected with a parking control handle 201. The air source system provides the air pressure required for braking for the parking brake.
The working process of the vehicle pneumatic parking brake control system in the embodiment 1 is as follows:
when the parking brake is completely released by operating the parking control handle, if the extension of the hydraulic supporting leg is the maximum extension, the transmission mechanism drives the swing rod to swing, so that the air inlet-outlet pressure ratio of the proportional valve is equal to 8:1, the air pressure of a parking brake air chamber is far lower than the air pressure required for releasing the parking brake, and the vehicle is still in a complete parking brake state; if the extension of the hydraulic support leg is equal to 0, the transmission mechanism drives the swing rod to swing, the ratio of the air inlet pressure to the air outlet pressure of the proportional valve is 1:1, the air pressure of the parking brake air chamber is the air outlet pressure of the air source system, and the parking brake can be completely released under the pressure; if the extension of the hydraulic supporting leg in the retracting process is continuously reduced, the transmission mechanism drives the swing rod to swing, so that the pressure ratio of air inlet and air outlet of the proportional valve is continuously reduced, and the air pressure of the parking brake air chamber is continuously increased, so that the parking brake is gradually released.
Example 2:
as shown in fig. 2, the difference from the above embodiment 1 is that the swing link 304 of the proportional valve 202 is connected in communication with the pressure sensor 304 through a driving mechanism. The driving mechanism comprises a motor controller 501 and a driving motor 502, the motor controller 501 is in communication connection with the pressure sensor 304, and the driving motor 502 is used for driving the swing rod 204 to swing. The motor controller 501 is used for acquiring oil pressure of a hydraulic circuit, when the oil pressure of the hydraulic circuit is increased, the extension amount of a hydraulic supporting leg is increased, and the driving motor 502 is controlled to drive the swing rod 304 to swing, so that the air inlet and air outlet pressure ratio of the proportional valve 202 is increased, and the air pressure for releasing the parking brake in the parking brake air chamber is continuously reduced.
The control process of the vehicle pneumatic parking brake control system in the above embodiment 2 is as follows: when the parking control handle 201 is operated to release the parking brake, the motor controller 501 obtains the oil pressure of the hydraulic circuit, controls the driving motor 502 to drive the swing rod 304 to move according to the oil pressure of the hydraulic circuit, and controls the air inlet and air outlet pressure ratio of the proportional valve 202 through the stroke of the swing rod 304, so as to control the air pressure of the parking brake air chamber.
Specifically, when the oil pressure of the hydraulic circuit is greater than or equal to a first oil pressure, the extension amount of the hydraulic support leg is the maximum extension amount during the first oil pressure, the motor controller 501 controls the driving motor 502 to drive the swing rod 304 to swing, the air inlet and air outlet pressure ratio of the proportional valve 202 is equal to a first pressure ratio, the first pressure ratio is 8:1, the air pressure of the parking brake air chamber is far lower than the air pressure required by releasing the parking brake, and the vehicle is still in a full parking brake state; when the oil pressure of the hydraulic loop is less than or equal to the second oil pressure, the extension amount of the hydraulic support leg is 0 during the first oil pressure, the driving motor 502 is controlled to drive the swing rod 304 to swing, the ratio of the air inlet pressure to the air outlet pressure of the proportional valve 202 is equal to 1, the air pressure of the parking brake air chamber is the air outlet pressure of the air source system, and the pressure can completely relieve the parking brake; when the oil pressure of the hydraulic loop is continuously reduced between the first oil pressure and the second oil pressure, the transmission mechanism drives the swing rod to swing, the pressure ratio of air inlet to air outlet of the proportional valve is continuously reduced between 8:1 and 1:1, the air pressure of the parking brake air chamber is continuously increased, and therefore parking brake is gradually released.
Claims (10)
1. The utility model provides a vehicle pneumatic parking braking control system which characterized in that: including air source system, atmospheric pressure parking braking return circuit and hydraulic support device, parking braking pneumatic circuit includes parking brake lever (201), proportional valve (202) and parking brake air chamber (203) that connect gradually with air source system's gas outlet, proportional valve (202) are used for adjusting proportional valve (202) and admit air and give vent to anger the pressure ratio, hydraulic support device including fix hydraulic cylinder body (301) in vehicle chassis below, with hydraulic support leg (302) and hydraulic circuit (303) of hydraulic cylinder body (301) relative concertina movement, hydraulic circuit (303) include pressure sensor (304), proportional valve (202) are connected or are connected through actuating mechanism and pressure sensor (304) communication with hydraulic support leg (302) through drive mechanism.
2. The vehicle pneumatic parking brake control system according to claim 1, characterized in that: the proportional valve (202) comprises a swing rod (204), a cam (205) is fixedly connected to the swing rod (204), the cam (205) is abutted to one end of a tappet (206), and the other end of the tappet (206) is connected with a piston (207).
3. The vehicle pneumatic parking brake control system according to claim 2, characterized in that: the transmission mechanism comprises a drawing wire (401) with two ends respectively connected with the swing rod (204) and the hydraulic supporting leg (302), and a spring (402) is arranged in the middle of the drawing wire (401).
4. The vehicle pneumatic parking brake control system according to claim 3, characterized in that: the air inlet-outlet pressure ratio of the proportional valve (202) is increased along with the expansion and contraction amount of the hydraulic support leg (302).
5. The vehicle pneumatic parking brake control system according to claim 2, characterized in that: the driving mechanism comprises a motor controller (501) and a driving motor (502), the motor controller (501) is in communication connection with the pressure sensor (304), and the driving motor (502) is used for driving the swing rod (204) to swing.
6. The vehicle pneumatic parking brake control system according to claim 5, characterized in that: the motor controller (501) is used for acquiring the oil pressure of the hydraulic circuit, and when the oil pressure of the hydraulic circuit is increased, the driving motor (502) is controlled to drive the swing rod (304) to swing, so that the air inlet-outlet pressure ratio of the proportional valve (202) is increased.
7. The vehicle pneumatic parking brake control system according to claim 1, characterized in that: the air source system comprises an air compressor (101), an air processing unit (102) and a parking air cylinder (103) which are sequentially connected, and an air outlet of the parking air cylinder (103) is connected with a parking control handle (201).
8. A control method of a vehicle air-pressure parking brake control system according to claim 6, characterized in that: when the parking control handle (201) is operated to release the parking brake, the motor controller (501) obtains the oil pressure of a hydraulic circuit, controls the driving motor (502) to drive the swing rod (304) to move according to the oil pressure of the hydraulic circuit, and controls the air inlet-outlet pressure ratio of the proportional valve (202) through the stroke of the swing rod (304).
9. The control method of a vehicle pneumatic parking brake control system according to claim 8, characterized in that: when the oil pressure of the hydraulic circuit is increased, the motor controller (501) controls the driving motor (502) to drive the swing rod (304) to swing, so that the air inlet-outlet pressure ratio of the proportional valve (202) is increased.
10. The control method of a vehicle pneumatic parking brake control system according to claim 9, characterized in that: when the oil pressure of the hydraulic circuit is greater than or equal to a first oil pressure, the driving motor (502) is controlled to drive the swing rod (304) to swing, so that the air inlet and air outlet pressure ratio of the proportional valve (202) is equal to the first pressure ratio, the first pressure ratio is greater than 1, when the oil pressure of the hydraulic circuit is less than or equal to a second oil pressure, the driving motor (502) is controlled to drive the swing rod (304) to swing, the air inlet and air outlet pressure ratio of the proportional valve (202) is equal to 1, and the first oil pressure is greater than the second oil pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111239366.0A CN113911088B (en) | 2021-10-25 | 2021-10-25 | Control method of vehicle pneumatic parking brake control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111239366.0A CN113911088B (en) | 2021-10-25 | 2021-10-25 | Control method of vehicle pneumatic parking brake control system |
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| Publication Number | Publication Date |
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| CN113911088A true CN113911088A (en) | 2022-01-11 |
| CN113911088B CN113911088B (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111239366.0A Active CN113911088B (en) | 2021-10-25 | 2021-10-25 | Control method of vehicle pneumatic parking brake control system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001139282A (en) * | 1999-11-10 | 2001-05-22 | Furukawa Co Ltd | Boom unhoused state warning device |
| JP2004017849A (en) * | 2002-06-18 | 2004-01-22 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for working vehicle |
| CN201694021U (en) * | 2010-06-18 | 2011-01-05 | 东风汽车有限公司 | Floating bridge no-load automatic lifting control device |
| CN203611969U (en) * | 2013-10-12 | 2014-05-28 | 北奔重型汽车集团有限公司 | Pneumatic parking system |
| CN206155260U (en) * | 2016-10-31 | 2017-05-10 | 中国煤炭科工集团太原研究院有限公司 | Articulated two -way driving of formula is from loading and unloading rubber tyer transport vechicle |
| CN108082147A (en) * | 2017-12-18 | 2018-05-29 | 重庆大江工业有限责任公司 | A kind of vehicle chassis telescopic leg structure |
| CN210391095U (en) * | 2019-06-27 | 2020-04-24 | 扬州大学 | Hydraulic parking device for low-chassis vehicle |
| CN212447464U (en) * | 2020-06-24 | 2021-02-02 | 江西江铃汽车集团改装车股份有限公司 | Vehicle-mounted hydraulic supporting leg state alarm circuit and automobile |
-
2021
- 2021-10-25 CN CN202111239366.0A patent/CN113911088B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001139282A (en) * | 1999-11-10 | 2001-05-22 | Furukawa Co Ltd | Boom unhoused state warning device |
| JP2004017849A (en) * | 2002-06-18 | 2004-01-22 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for working vehicle |
| CN201694021U (en) * | 2010-06-18 | 2011-01-05 | 东风汽车有限公司 | Floating bridge no-load automatic lifting control device |
| CN203611969U (en) * | 2013-10-12 | 2014-05-28 | 北奔重型汽车集团有限公司 | Pneumatic parking system |
| CN206155260U (en) * | 2016-10-31 | 2017-05-10 | 中国煤炭科工集团太原研究院有限公司 | Articulated two -way driving of formula is from loading and unloading rubber tyer transport vechicle |
| CN108082147A (en) * | 2017-12-18 | 2018-05-29 | 重庆大江工业有限责任公司 | A kind of vehicle chassis telescopic leg structure |
| CN210391095U (en) * | 2019-06-27 | 2020-04-24 | 扬州大学 | Hydraulic parking device for low-chassis vehicle |
| CN212447464U (en) * | 2020-06-24 | 2021-02-02 | 江西江铃汽车集团改装车股份有限公司 | Vehicle-mounted hydraulic supporting leg state alarm circuit and automobile |
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| CN113911088B (en) | 2022-08-23 |
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