CN111891100A - Direct-drive pump control brake unit for vehicle and control method - Google Patents
Direct-drive pump control brake unit for vehicle and control method Download PDFInfo
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- CN111891100A CN111891100A CN202010901713.0A CN202010901713A CN111891100A CN 111891100 A CN111891100 A CN 111891100A CN 202010901713 A CN202010901713 A CN 202010901713A CN 111891100 A CN111891100 A CN 111891100A
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- brake
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- servo motor
- wheel cylinder
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000009471 action Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- B60T13/12—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 the fluid being liquid
-
- 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
- B60T13/12—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 the fluid being liquid
- B60T13/16—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 the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
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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
-
- 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
- B60T13/74—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 electrical assistance or drive
- B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention relates to a direct-drive pump control brake unit for a vehicle and a control method thereof. The bidirectional hydraulic pump is characterized in that the brake controller outputs a control signal to the driver according to the braking force demand and a feedback signal of the pressure sensor so as to control the servo motor, and an output shaft of the servo motor directly drives the bidirectional hydraulic pump; the positive liquid outlet of the bidirectional hydraulic pump is communicated with the brake wheel cylinder, and the positive liquid inlet is communicated with the low-pressure accumulator. In the process of pressure increase, the servo motor rotates forwards, the torque is increased, and the pressure of the brake wheel cylinder is increased; in the pressure maintaining process, the servo motor outputs constant torque, and the pressure of the brake wheel cylinder is kept unchanged; when the pressure reducing process or the braking is finished, the servo motor is in a free state, and the pressure of the brake wheel cylinder is reduced. The invention combines the advantages of electric direct drive and pump control direct drive, and solves the problems of complex hydraulic pipeline, high energy consumption of a valve control hydraulic system and the like of the conventional brake-by-wire system.
Description
Technical Field
The invention relates to the technical field of automobile brake-by-wire, in particular to a pump control brake unit.
Background
After one hundred years of innovative development in the automobile industry, the traditional hydraulic Brake system directly connected mechanically cannot meet the development requirement of automobile electromotion, and Brake-By-Wire (Brake-By-Wire) becomes the main development direction of the automobile Brake system.
Brake-by-wire systems include two types: hydraulic brake-by-wire systems and mechanical brake-by-wire systems. The drive-by-wire mechanical brake system thoroughly abandons a hydraulic component, has no mechanical backup, takes a power supply as an energy source, and has the development problems of a motor, a power supply, safety, cost and the like; compared with a linear control mechanical brake system, the linear control hydraulic brake system is easier to realize and lower in development cost, and the brake safety of the vehicle can be still ensured when the electronic control unit fails. At present, a line control hydraulic brake system generally adopts a high-speed switch electromagnetic valve to control flow, and has the advantages of high reliability and low cost. However, the throttling loss of the solenoid valve brings about a large energy loss, and at the same time, the arrangement of the pipes between the master cylinder, the wheel cylinder, and the solenoid valves having a large number is complicated, which reduces the reliability, maintainability, and economy of the brake system.
According to the direct-drive pump-controlled braking unit for the vehicle and the control method, the output shaft of the servo motor is adopted to directly drive the bidirectional hydraulic pump, the forward liquid outlet of the bidirectional hydraulic pump is communicated with the brake wheel cylinder, the hydraulic pump directly drives the wheel cylinder piston, and the forward liquid inlet is communicated with the low-pressure accumulator, so that the control of the pressure of the wheel cylinder is realized, the advantages of electric direct drive and pump-controlled direct drive are combined, the braking pipeline is simplified, and the energy consumption of a braking system is reduced.
Disclosure of Invention
The design of the direct drive type pump control brake unit for the vehicle and the control method aim at adopting a servo motor output shaft to directly drive a bidirectional hydraulic pump, wherein a forward liquid outlet of the bidirectional hydraulic pump is communicated with a brake wheel cylinder, the hydraulic pump directly drives a wheel cylinder piston, and a forward liquid inlet is communicated with a low-pressure accumulator, so that the control of the pressure of the wheel cylinder is realized, the advantages of electric direct drive and pump control direct drive are combined, and the problems of complex hydraulic pipeline, high energy consumption of a valve control hydraulic system and the like of the existing line control brake system are solved.
A vehicle direct-drive pump control brake unit and a control method thereof comprise a driver (1), a servo motor (2), a bidirectional hydraulic pump (3), a low-pressure energy accumulator (4), a disc brake (5), a pressure sensor (6) and a brake controller (7); the brake system is characterized by comprising a brake controller (7) and a pressure sensor (6), wherein the brake controller outputs a control signal to a driver (1) according to a braking force demand and a feedback signal of the pressure sensor to further control a servo motor (2), and an output shaft of the servo motor (2) directly drives a bidirectional hydraulic pump (3); a forward liquid outlet of the bidirectional hydraulic pump (3) is communicated with a brake wheel cylinder (5.1), a forward liquid inlet is communicated with the low-pressure accumulator (4), and the bidirectional hydraulic pump (3) is a vane pump or a gear pump without a suction valve and a discharge valve; the control method of the direct-drive pump control brake unit comprises the following steps: when the device works in a pressurization process, the servo motor (2) rotates forwards, the torque is increased, the pressure of the brake wheel cylinder (5.1) is increased, and the output force of the brake wheel cylinder piston (5.3) is increased; when the brake works in the pressure maintaining process, the servo motor (2) outputs constant torque, and the pressure of the brake wheel cylinder (5.1) is kept unchanged; when the brake works in the pressure reduction process, the servo motor (2) works in a free state, and the pressure of the brake wheel cylinder (5.1) is reduced; when braking is finished, the brake wheel cylinder piston (5.3) is reset under the action of the brake wheel cylinder sealing ring (5.2), and the output force of the brake wheel cylinder piston (5.3) is 0.
When the servo motor (2) works in a free state, the pressure generated by the reset force of the brake cylinder sealing ring (5.2) is higher than the sum of the system pressure loss and the pressure of the low-pressure energy accumulator (4), and the brake cylinder piston (5.3) can reset under the action of the reset force of the brake cylinder sealing ring (5.2).
When the servo motor (2) does not work, under the action of the low-pressure accumulator (4), the pressure generated by the brake wheel cylinder piston (5.3) is smaller than the friction force applied to the brake wheel cylinder piston (5.3).
The servo motor (2) only has a forward rotation driving state and a free state when working.
The brake cylinder (5.1) has only one hydraulic connection.
The bidirectional hydraulic pump (3) is a fixed displacement pump, the number of the disc brakes (5) is not less than that of the bidirectional hydraulic pump (3), and the servo motor (2), the bidirectional hydraulic pump (3) and the low-pressure energy accumulator (4) are equal in number.
The invention relates to a vehicle direct-drive pump control brake unit and a control method thereof, aiming at adopting a servo motor output shaft to directly drive a bidirectional hydraulic pump, wherein a forward liquid outlet of the bidirectional hydraulic pump is communicated with a brake wheel cylinder, the hydraulic pump directly drives a wheel cylinder piston, and a forward liquid inlet is communicated with a low-pressure accumulator, so that the control of the pressure of the wheel cylinder is realized, the advantages of electric direct drive and pump control direct drive are combined, and the problems of complex hydraulic pipeline, high energy consumption of a valve control hydraulic system and the like of the existing line control brake system are solved.
The invention relates to a vehicle direct-drive pump control brake unit and a control method thereof.A servo motor output shaft is adopted to directly drive a bidirectional hydraulic pump, the bidirectional hydraulic pump is a vane pump or a gear pump without a suction valve and a discharge valve, a rotary-linear motion conversion device is not arranged between the servo motor and the bidirectional hydraulic pump, the power transmission efficiency is high, and the dynamic response is rapid.
According to the direct-drive pump control brake unit for the vehicle and the control method, the bidirectional hydraulic pump is adopted to directly control the pressure of the brake wheel cylinder, the throttling loss of the fluid valve is avoided, the efficiency of a hydraulic system is further improved, and the braking energy consumption is reduced.
According to the direct-drive pump-controlled braking unit for the vehicle and the control method, the adopted direct-drive pump-controlled braking unit is a local integrated hydraulic system, hydraulic pipelines among a brake master cylinder, brake wheel cylinders and a large number of electromagnetic valves are simplified, and the direct-drive pump-controlled braking unit has positive significance for the design of the whole vehicle.
The direct-drive pump control brake unit for the vehicle and the control method have the advantages of high efficiency, energy conservation, quick response, compact structure and the like, and bring huge economic benefits after being put into industrial application.
Drawings
Fig. 1 is a schematic composition diagram of a direct drive type pump control brake unit for a vehicle and a control method of the direct drive type pump control brake unit.
Fig. 2 is a schematic diagram of a brake-by-wire system based on a direct-drive pump-controlled brake unit and a control method for a vehicle according to the present invention.
Fig. 3 is a schematic diagram of a brake-by-wire system based on a direct-drive pump-controlled brake unit for a vehicle and a control method according to another embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a direct drive type pump control brake unit for a vehicle and a control method thereof comprise a driver (1), a servo motor (2), a bidirectional hydraulic pump (3), a low-pressure accumulator (4), a disc brake (5), a pressure sensor (6) and a brake controller (7); the brake system is characterized by comprising a brake controller (7) and a pressure sensor (6), wherein the brake controller outputs a control signal to a driver (1) according to a braking force demand and a feedback signal of the pressure sensor to further control a servo motor (2), and an output shaft of the servo motor (2) directly drives a bidirectional hydraulic pump (3); a forward liquid outlet of the bidirectional hydraulic pump (3) is communicated with a brake wheel cylinder (5.1), a forward liquid inlet is communicated with the low-pressure accumulator (4), and the bidirectional hydraulic pump (3) is a vane pump or a gear pump without a suction valve and a discharge valve; the control method of the direct-drive pump control brake unit comprises the following steps: when the device works in a pressurization process, the servo motor (2) rotates forwards, the torque is increased, the pressure of the brake wheel cylinder (5.1) is increased, and the output force of the brake wheel cylinder piston (5.3) is increased; when the brake works in the pressure maintaining process, the servo motor (2) outputs constant torque, and the pressure of the brake wheel cylinder (5.1) is kept unchanged; when the brake works in the pressure reduction process, the servo motor (2) works in a free state, and the pressure of the brake wheel cylinder (5.1) is reduced; when braking is finished, the brake wheel cylinder piston (5.3) is reset under the action of the brake wheel cylinder sealing ring (5.2), and the output force of the brake wheel cylinder piston (5.3) is 0.
When the servo motor (2) works in a free state, the pressure generated by the reset force of the brake cylinder sealing ring (5.2) is higher than the sum of the system pressure loss and the pressure of the low-pressure energy accumulator (4), and the brake cylinder piston (5.3) can reset under the action of the reset force of the brake cylinder sealing ring (5.2).
When the servo motor (2) does not work, under the action of the low-pressure accumulator (4), the pressure generated by the brake wheel cylinder piston (5.3) is smaller than the friction force applied to the brake wheel cylinder piston (5.3).
The servo motor (2) only has a forward rotation driving state and a free state when working.
The brake cylinder (5.1) has only one hydraulic connection.
The bidirectional hydraulic pump (3) is a fixed displacement pump, the number of the disc brakes (5) is not less than that of the bidirectional hydraulic pump (3), and the servo motor (2), the bidirectional hydraulic pump (3) and the low-pressure energy accumulator (4) are equal in number.
As shown in fig. 2, the numbers of the servo motor (2), the bidirectional hydraulic pump (3) and the low-pressure accumulator (4) are respectively 4, and the number of the controlled brake wheel cylinders is also 4; as shown in fig. 3, the numbers of the servo motor (2), the bidirectional hydraulic pump (3), and the low-pressure accumulator (4) are 2, respectively, and the number of the brake cylinders to be controlled is 4. The specification and model of the servo motor (2), the bidirectional hydraulic pump (3) and the low-pressure accumulator (4) in the brake-by-wire system shown in the figures 2 and 3 are different, so as to meet the requirements of different brake systems.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A vehicle direct-drive pump control brake unit and a control method thereof comprise a driver (1), a servo motor (2), a bidirectional hydraulic pump (3), a low-pressure energy accumulator (4), a disc brake (5), a pressure sensor (6) and a brake controller (7); the method is characterized by comprising the following steps: the brake controller (7) outputs a control signal to the driver (1) according to the braking force demand and a feedback signal of the pressure sensor (6) so as to control the servo motor (2), and an output shaft of the servo motor (2) directly drives the bidirectional hydraulic pump (3); a forward liquid outlet of the bidirectional hydraulic pump (3) is communicated with a brake wheel cylinder (5.1), a forward liquid inlet is communicated with the low-pressure accumulator (4), and the bidirectional hydraulic pump (3) is a vane pump or a gear pump without a suction valve and a discharge valve; the control method of the direct-drive pump control brake unit comprises the following steps: when the device works in a pressurization process, the servo motor (2) rotates forwards, the torque is increased, the pressure of the brake wheel cylinder (5.1) is increased, and the output force of the brake wheel cylinder piston (5.3) is increased; when the brake works in the pressure maintaining process, the servo motor (2) outputs constant torque, and the pressure of the brake wheel cylinder (5.1) is kept unchanged; when the brake works in the pressure reduction process, the servo motor (2) works in a free state, and the pressure of the brake wheel cylinder (5.1) is reduced; when braking is finished, the brake wheel cylinder piston (5.3) is reset under the action of the brake wheel cylinder sealing ring (5.2), and the output force of the brake wheel cylinder piston (5.3) is 0.
2. The vehicle direct-drive pump control brake unit and the control method according to claim 1, characterized in that when the servo motor (2) works in a free state, the pressure generated by the reset force of the brake cylinder sealing ring (5.2) is higher than the sum of the system pressure loss and the pressure of the low-pressure accumulator (4), and the brake cylinder piston (5.3) can be reset under the action of the reset force of the brake cylinder sealing ring (5.2).
3. The vehicle direct-drive pump-controlled brake unit and the control method according to claim 1, characterized in that when the servo motor (2) does not work, under the action of the low-pressure accumulator (4), the pressure generated by the wheel cylinder piston (5.3) is smaller than the friction force applied to the wheel cylinder piston (5.3).
4. The direct drive type pump controlled brake unit for vehicle and the control method according to claim 1, wherein the servo motor (2) operates only in a forward driving state and a free state.
5. The vehicle direct drive pump control brake unit and the control method according to claim 1, characterized in that the brake cylinder (5.1) has only one hydraulic interface.
6. The vehicle direct drive type pump control brake unit and the control method according to claim 1, wherein the bidirectional hydraulic pumps (3) are fixed displacement pumps, the number of the disc brakes (5) is not less than the number of the bidirectional hydraulic pumps (3), and the number of the servo motors (2), the bidirectional hydraulic pumps (3) and the low pressure accumulators (4) is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901713.0A CN111891100A (en) | 2020-09-01 | 2020-09-01 | Direct-drive pump control brake unit for vehicle and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901713.0A CN111891100A (en) | 2020-09-01 | 2020-09-01 | Direct-drive pump control brake unit for vehicle and control method |
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| Publication Number | Publication Date |
|---|---|
| CN111891100A true CN111891100A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010901713.0A Pending CN111891100A (en) | 2020-09-01 | 2020-09-01 | Direct-drive pump control brake unit for vehicle and control method |
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| Country | Link |
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| CN (1) | CN111891100A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102442291A (en) * | 2011-10-28 | 2012-05-09 | 南京理工大学 | Direct-drive electrical-hydraulic braking unit used in brake-by-wire system |
-
2020
- 2020-09-01 CN CN202010901713.0A patent/CN111891100A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102442291A (en) * | 2011-10-28 | 2012-05-09 | 南京理工大学 | Direct-drive electrical-hydraulic braking unit used in brake-by-wire system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
| CN116039593B (en) * | 2023-02-17 | 2024-04-26 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
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Application publication date: 20201106 |
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