CN111891099B - Active flow distribution type electromagnetic direct-drive hydrostatic brake unit and control method thereof - Google Patents
Active flow distribution type electromagnetic direct-drive hydrostatic brake unit and control method thereof Download PDFInfo
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- CN111891099B CN111891099B CN202010828536.8A CN202010828536A CN111891099B CN 111891099 B CN111891099 B CN 111891099B CN 202010828536 A CN202010828536 A CN 202010828536A CN 111891099 B CN111891099 B CN 111891099B
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- switch valve
- brake
- linear motor
- piston
- pressure
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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
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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
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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
- B60T13/74—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
Abstract
The invention relates to an active flow distribution type electromagnetic direct-drive hydrostatic brake unit and a control method thereof. The linear motor rotor directly drives a piston to reciprocate in the hydraulic cylinder, and an outlet switch valve and an inlet switch valve are normally open valves and are respectively arranged between the hydraulic cylinder and the brake and between the hydraulic cylinder and the low-pressure energy accumulator; when the linear motor does not work, the piston is positioned at the tail end of the liquid suction stroke under the action of the thrust of the return spring; the brake controller controls the linear motor, the outlet switch valve and the inlet switch valve to move according to the brake demand and the displacement information of the rotor of the linear motor, so that the pressure increase, pressure maintaining and pressure reduction of the brake wheel cylinder are realized; the invention combines the advantages of electromagnetic direct drive and pump control direct drive, has high efficiency, energy saving and rapid response, and solves the problems of complex hydraulic pipeline, high energy consumption and the like of the existing 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 brake 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 active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof, a linear motor is adopted to directly drive a piston to reciprocate in a hydraulic cylinder, and the active flow distribution of a switch valve is combined to realize the pressurization, pressure maintaining and pressure reduction of a brake wheel cylinder; the advantages of electromagnetic direct drive and pump control direct drive are combined, the system is efficient, energy-saving and rapid in response, and the problems that a hydraulic pipeline of an existing system is complex and energy consumption is high are solved.
Disclosure of Invention
The active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof are designed, and aim to realize the pressurization, pressure maintaining and pressure reduction of a brake wheel cylinder by adopting a linear motor to directly drive a piston to reciprocate in a hydraulic cylinder and combining the active flow distribution of a switch valve; the advantages of electromagnetic direct drive and pump control direct drive are combined, the system is efficient, energy-saving and rapid in response, and the problems that a hydraulic pipeline of an existing system is complex and energy consumption is high are solved.
The utility model provides an initiative flow distribution formula electromagnetism directly drives hydrostatic braking unit and control method thereof, includes displacement sensor (1), linear electric motor (2), reset spring (3), pneumatic cylinder (4), export ooff valve (5), piston (6), import ooff valve (7), low pressure energy storage ware (8), brake controller (9), stopper (10), its characteristic includes:
the linear motor rotor (2.1) directly drives the piston (6) to reciprocate in the hydraulic cylinder (4), and the outlet switch valve (5) and the inlet switch valve (7) are normally open valves and are respectively arranged between a working cavity of the hydraulic cylinder (4) and the brake (10) and between the working cavity of the hydraulic cylinder (4) and the low-pressure energy accumulator (8); when the linear motor (2) does not work, the piston (6) is positioned at the tail end of the liquid suction stroke under the action of the thrust of the return spring (3); the brake controller (9) controls the linear motor (2), the outlet switch valve (5) and the inlet switch valve (7) to move according to the displacement information of the linear motor rotor (2.1) acquired by the displacement sensor (1) according to the brake demand, so that the brake wheel cylinder (10.1) is pressurized, maintained and decompressed; the concrete control method for realizing the pressurization, pressure maintaining and pressure reduction of the brake wheel cylinder (10.1) comprises the following steps: and (3) a pressurization process: the linear motor rotor (2.1) drives the piston (6) to start reciprocating motion in the hydraulic cylinder (4) from the pump liquid stroke starting end (liquid suction stroke end), the outlet switch valve (5) is kept open, the inlet switch valve (7) is kept closed in the process that the piston (6) moves from the pump liquid stroke starting end to the pump liquid stroke end (liquid suction stroke starting end), and hydraulic oil in the hydraulic cylinder (6) is pumped into the wheel cylinder brake (10.1); in the process that the piston (6) moves from the liquid suction stroke starting end (the pump liquid stroke tail end) to the liquid suction stroke tail end (the pump liquid stroke starting end), the outlet switch valve (5) is closed, the inlet switch valve (7) is opened, and hydraulic oil in the low-pressure energy accumulator (8) is pumped into the hydraulic cylinder (6); the hydraulic oil in the low-pressure accumulator (8) is pumped into the brake wheel cylinder (10.1) in a reciprocating mode, and the brake wheel cylinder (10.1) is pressurized. And (3) in the pressure maintaining process: the linear motor (2) does not work, the outlet opening-closing valve (5) is closed, the inlet opening-closing valve (7) is opened, and the pressure of the brake wheel cylinder (10.1) is kept. In the decompression process: when the linear motor (2) does not work, the outlet switch valve (5) is opened, the inlet switch valve (7) is opened, high-pressure hydraulic oil flows into the low-pressure energy accumulator (8) from the brake wheel cylinder (10.1), and the pressure of the brake wheel cylinder (10.1) is reduced.
The linear motor (2) is based on a Halbach permanent magnet array, the rotor (2.1) of the linear motor is of a moving coil type or a moving magnet type, and the output force of the linear motor (2) is approximately in direct proportion to the driving current. The outlet switch valve (5) and the inlet switch valve (7) are driven by an electromagnet containing a permanent magnet.
During the decompression process after the braking is finished: after the pressure of the brake wheel cylinder (10.1) is reduced to the normal pressure of the system, the brake piston (10.3) is reset under the action of the reset force generated by the brake piston sealing ring (10.2).
The brake wheel cylinder (10.1) is only provided with one hydraulic interface, and when the piston (6) is positioned at the tail end of a pump liquid stroke (the initial end of a liquid suction stroke), no gap is reserved between the axial direction of the piston (6) and the inner wall of the hydraulic cylinder (4).
The invention relates to an active flow distribution type electromagnetic direct-drive hydrostatic braking unit and a control method thereof.A linear motor is adopted to directly drive a piston to reciprocate in a hydraulic cylinder, and the active flow distribution of a switch valve is combined to realize the pressurization, pressure maintaining and pressure reduction of a brake wheel cylinder; the advantages of electromagnetic direct drive and pump control direct drive are combined, the system is efficient, energy-saving and rapid in response, and the problems that a hydraulic pipeline of an existing system is complex and energy consumption is high are solved.
According to the active flow distribution type electromagnetic direct-drive hydrostatic brake unit and the control method thereof, the linear motor is adopted to directly drive the piston to reciprocate in the hydraulic cylinder, hydraulic oil is pumped to control the pressure of the brake wheel cylinder, the power transmission efficiency is high, and the dynamic response is rapid.
According to the active flow distribution type electromagnetic direct-drive hydrostatic brake unit and the control method thereof, the switch valve is adopted for active flow distribution, so that the pressure increase, pressure maintaining and pressure reduction of the brake wheel cylinder are realized, and the efficiency of pumping hydraulic oil is further improved.
According to the active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof, the active flow distribution type electromagnetic direct-drive hydrostatic braking unit is a locally integrated hydraulic system, so that a brake master cylinder, a brake wheel cylinder and hydraulic pipelines among a large number of electromagnetic valves are simplified, and the active flow distribution type electromagnetic direct-drive hydrostatic braking unit has positive significance for the design of the whole automobile.
The active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof 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 system schematic diagram of an active flow distribution type electromagnetic direct-drive hydrostatic brake unit and a control method thereof.
Fig. 2 is a schematic diagram of a high-reliability brake unit system based on an active flow distribution type electromagnetic direct-drive hydrostatic brake unit and a control method thereof.
FIG. 3 is a system three-dimensional integration schematic diagram of the active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof.
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, an active flow distribution type electromagnetic direct-drive hydrostatic braking unit and a control method thereof include a displacement sensor (1), a linear motor (2), a return spring (3), a hydraulic cylinder (4), an outlet switch valve (5), a piston (6), an inlet switch valve (7), a low-pressure energy accumulator (8), a braking controller (9) and a brake (10), and are characterized by including: the linear motor rotor (2.1) directly drives the piston (6) to reciprocate in the hydraulic cylinder (4), and the outlet switch valve (5) and the inlet switch valve (7) are normally open valves and are respectively arranged between a working cavity of the hydraulic cylinder (4) and the brake (10) and between the working cavity of the hydraulic cylinder (4) and the low-pressure energy accumulator (8); when the linear motor (2) does not work, the piston (6) is positioned at the tail end of the liquid suction stroke under the action of the thrust of the return spring (3); the brake controller (9) controls the linear motor (2), the outlet switch valve (5) and the inlet switch valve (7) to move according to the displacement information of the linear motor rotor (2.1) acquired by the displacement sensor (1) according to the brake demand, so that the brake wheel cylinder (10.1) is pressurized, maintained and decompressed; the concrete control method for realizing the pressurization, pressure maintaining and pressure reduction of the brake wheel cylinder (10.1) comprises the following steps: and (3) a pressurization process: the linear motor rotor (2.1) drives the piston (6) to start reciprocating motion in the hydraulic cylinder (4) from the pump liquid stroke starting end (liquid suction stroke end), the outlet switch valve (5) is kept open, the inlet switch valve (7) is kept closed in the process that the piston (6) moves from the pump liquid stroke starting end to the pump liquid stroke end (liquid suction stroke starting end), and hydraulic oil in the hydraulic cylinder (6) is pumped into the wheel cylinder brake (10.1); in the process that the piston (6) moves from the liquid suction stroke starting end (the pump liquid stroke tail end) to the liquid suction stroke tail end (the pump liquid stroke starting end), the outlet switch valve (5) is closed, the inlet switch valve (7) is opened, and hydraulic oil in the low-pressure energy accumulator (8) is pumped into the hydraulic cylinder (6); the hydraulic oil in the low-pressure accumulator (8) is pumped into the brake wheel cylinder (10.1) in a reciprocating mode, and the brake wheel cylinder (10.1) is pressurized. And (3) in the pressure maintaining process: the linear motor (2) does not work, the outlet opening-closing valve (5) is closed, the inlet opening-closing valve (7) is opened, and the pressure of the brake wheel cylinder (10.1) is kept. In the decompression process: when the linear motor (2) does not work, the outlet switch valve (5) is opened, the inlet switch valve (7) is opened, high-pressure hydraulic oil flows into the low-pressure energy accumulator (8) from the brake wheel cylinder (10.1), and the pressure of the brake wheel cylinder (10.1) is reduced.
The linear motor (2) is based on a Halbach permanent magnet array, the rotor (2.1) of the linear motor is of a moving coil type or a moving magnet type, and the output force of the linear motor (2) is approximately in direct proportion to the driving current. The outlet switch valve (5) and the inlet switch valve (7) are driven by an electromagnet containing a permanent magnet.
And in the decompression process after braking is finished: after the pressure of the brake wheel cylinder (10.1) is reduced to the normal pressure of the system, the brake piston (10.3) is reset under the action of the reset force generated by the brake piston sealing ring (10.2).
The brake wheel cylinder (10.1) is only provided with one hydraulic interface, and when the piston (6) is positioned at the tail end of the pump fluid stroke (the initial end of the suction stroke), no gap is reserved between the axial direction of the piston (6) and the inner wall of the hydraulic cylinder (4).
When the power density of the linear motor is difficult to meet the requirement of a braking system of a vehicle with larger power or the application field requiring high reliability, the invention provides the high-reliability braking unit based on the active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof shown in fig. 2, wherein the high-reliability braking unit comprises the following components: the other electromagnetic direct-drive piston pump (11) is added into the original system and comprises a linear motor rotor (11.4), a linear motor stator (11.3), a hydraulic pump piston (11.5), a hydraulic pump hydraulic cylinder (11.2) and a check valve bank (11.1). A linear motor rotor (11.4) of the electromagnetic direct-drive piston pump (11) directly drives two hydraulic pump pistons (11.5) to reciprocate in a hydraulic pump hydraulic cylinder (11.2), and hydraulic oil in a low-pressure energy accumulator (8) is pumped into a brake wheel cylinder (10.1) under the flow distribution action of a check valve bank (11.1). The diameter of the hydraulic pump piston (11.5) is smaller than that of the piston (6). The electromagnetic direct-drive piston pump (11) works when the linear motor (2) works. Due to the introduction of the electromagnetic direct-drive piston pump (11), the application range of the active flow distribution type electromagnetic direct-drive hydrostatic braking unit and the control method thereof is greatly expanded, and the reliability and fault tolerance of the system are improved.
As shown in fig. 3, a system three-dimensional integration schematic diagram of an active flow distribution type electromagnetic direct-drive hydrostatic braking unit and a control method thereof is provided, wherein a return spring (3) is installed inside a linear motor (2), one side of the linear motor (2) is integrated with a hydraulic cylinder (4), and a displacement sensor (1) and a brake controller (9) are integrated and installed on the other side of the linear motor (2). An outlet switch valve (5) and an inlet switch valve (7) are arranged on the upper part of the hydraulic cylinder (4), and a low-pressure energy accumulator (8) is positioned above the linear motor (2) and is arranged on one side of the outlet switch valve (5) and one side of the inlet switch valve (7); one side of the valve block of the outlet switch valve (5) and the inlet switch valve (7) is provided with a hydraulic joint of the outlet switch valve (5), the hydraulic joint is connected with a brake wheel cylinder (10.1) through an oil pipe, and the installation position of a hydraulic power and control part in front of the outlet switch valve (5) in the active flow distribution type electromagnetic direct-drive hydrostatic brake unit can be adjusted by adjusting the length of the oil pipe, so that the active flow distribution type electromagnetic direct-drive hydrostatic brake unit is convenient to arrange in the whole vehicle.
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 (4)
1. The utility model provides an initiative flow distribution formula electromagnetism directly drives hydrostatic braking unit and control method thereof, includes displacement sensor (1), linear electric motor (2), reset spring (3), pneumatic cylinder (4), export ooff valve (5), piston (6), import ooff valve (7), low pressure energy storage ware (8), brake controller (9), stopper (10), its characteristic includes:
the linear motor rotor (2.1) directly drives the piston (6) to reciprocate in the hydraulic cylinder (4), and the outlet switch valve (5) and the inlet switch valve (6) are normally open valves and are respectively arranged between a working cavity of the hydraulic cylinder (5) and the brake (10) and between the working cavity of the hydraulic cylinder (5) and the low-pressure energy accumulator (8); when the linear motor (2) does not work, the piston (6) is positioned at the tail end of the liquid suction stroke under the action of the thrust (3) of the return spring; the brake controller (9) controls the linear motor (2), the outlet switch valve (5) and the inlet switch valve (7) to move according to the brake demand and the displacement information of the linear motor rotor (2.1) acquired by the displacement sensor (1), so that the brake wheel cylinder (10.1) is pressurized, maintained and decompressed;
the specific control method for realizing pressurization, pressure maintaining and pressure reduction of the brake wheel cylinder (10.1) comprises the following steps: and (3) a pressurization process: the linear motor rotor (2.1) drives the piston (6) to reciprocate in the hydraulic cylinder (4) from the tail end of a liquid suction stroke, and in the process that the piston (6) moves from the initial end of a pump liquid stroke to the tail end of the pump liquid stroke, the outlet switch valve (5) is kept open, and the inlet switch valve (7) is kept closed; in the process that the piston (6) moves from the initial end of the liquid suction stroke to the tail end of the liquid suction stroke, the outlet switch valve (5) is closed, and the inlet switch valve (7) is opened; hydraulic oil in the low-pressure accumulator (8) is pumped into a brake wheel cylinder (10.1), and the brake wheel cylinder (10.1) is pressurized; and (3) in the pressure maintaining process: the linear motor (2) does not work, the outlet switch valve (5) is closed, the inlet switch valve (7) is opened, and the pressure of the brake wheel cylinder (10.1) is kept; in the process of pressure reduction: when the linear motor (2) does not work, the outlet switch valve (5) is opened, the inlet switch valve (7) is opened, high-pressure hydraulic oil flows into the low-pressure energy accumulator (8) from the brake wheel cylinder (10.1), and the pressure of the brake wheel cylinder (10.1) is reduced.
2. The active flow distribution type electromagnetic direct-drive hydrostatic brake unit and the control method thereof as claimed in claim 1, wherein the linear motor (2) is a linear motor based on a Halbach permanent magnet array, a linear motor rotor (2.1) is of a moving coil type or a moving magnet type, and the output force of the linear motor (2) is in an approximately direct proportional relation with the drive current; the outlet switch valve (5) and the inlet switch valve (7) are driven by an electromagnet containing a permanent magnet.
3. The active flow distribution type electromagnetic direct-drive hydrostatic brake unit and the control method thereof as claimed in claim 1, wherein during the pressure reduction process after braking is finished: after the pressure of the brake wheel cylinder (10.1) is reduced to the normal pressure of the system, the brake piston (10.3) is reset under the action of the reset force generated by the brake piston sealing ring (10.2).
4. The active flow distribution type electromagnetic direct-drive hydrostatic brake unit and the control method thereof as claimed in claim 1, wherein the brake wheel cylinder (5.1) has only one hydraulic interface, and when the piston (6) is located at the end position of the pump hydraulic stroke, the axial distance between the piston (6) and the inner wall of the hydraulic cylinder (4) is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828536.8A CN111891099B (en) | 2020-08-18 | 2020-08-18 | Active flow distribution type electromagnetic direct-drive hydrostatic brake unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828536.8A CN111891099B (en) | 2020-08-18 | 2020-08-18 | Active flow distribution type electromagnetic direct-drive hydrostatic brake unit and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111891099A CN111891099A (en) | 2020-11-06 |
| CN111891099B true CN111891099B (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010828536.8A Active CN111891099B (en) | 2020-08-18 | 2020-08-18 | Active flow distribution type electromagnetic direct-drive hydrostatic brake unit and control method thereof |
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| CN (1) | CN111891099B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0781539A (en) * | 1993-07-22 | 1995-03-28 | Nissan Motor Co Ltd | Antiskid device |
| JP3069991B2 (en) * | 1993-11-26 | 2000-07-24 | 日信工業株式会社 | Vehicle brake fluid pressure control device |
| 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 |
| CN204309768U (en) * | 2014-11-27 | 2015-05-06 | 江苏理工学院 | The distributed independent brake actuating unit in wheel limit, chassis and chassis brake system |
| CN104859626B (en) * | 2015-05-28 | 2017-07-14 | 西北工业大学 | A kind of electric hydrostatic braking action device of aircraft |
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2020
- 2020-08-18 CN CN202010828536.8A patent/CN111891099B/en active Active
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