CN112706738A - Electronic brake booster and electro-hydraulic brake energy recovery system - Google Patents
Electronic brake booster and electro-hydraulic brake energy recovery system Download PDFInfo
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- CN112706738A CN112706738A CN202110090609.2A CN202110090609A CN112706738A CN 112706738 A CN112706738 A CN 112706738A CN 202110090609 A CN202110090609 A CN 202110090609A CN 112706738 A CN112706738 A CN 112706738A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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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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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses an electronic brake booster and an electro-hydraulic brake energy recovery system. The electronic brake booster includes a brake pedal stroke detecting unit for detecting a brake stroke of a brake pedal; a brake piston stroke control unit for controlling the brake stroke of the brake piston in the brake master cylinder according to the input brake piston stroke control command or the output torque of the brake pedal; the brake pedal is controlled to be connected with the brake piston stroke control unit according to an input command, and the brake pedal is controlled to be separated from the brake piston stroke control unit according to an input cut-off command; and the electronic control unit is electrically connected with the three units and the whole vehicle controller. The electro-hydraulic braking energy recovery system comprises an electronic hydraulic braking subsystem containing the electronic braking booster, a braking energy recovery subsystem and a vehicle control unit. According to the invention, the problem of low energy recovery rate of the braking energy recovery system of the conventional electric automobile can be solved.
Description
Technical Field
The invention belongs to the technical field of braking energy recovery, and particularly relates to an electronic brake booster and an electro-hydraulic braking energy recovery system.
Background
The braking energy recovery system of the existing electric automobile can be divided into a superposition type Regenerative Braking System (RBS) and a cooperative type regenerative braking system (CRBS), and the two regenerative braking systems are the biggest differences: in the superposition type regenerative braking system, a brake pedal is coupled with a brake actuating mechanism; in a cooperative regenerative braking system, the brake pedal is decoupled from the brake actuator. In one braking condition of the electric vehicle, one source of the braking torque is mechanical braking brought by the friction plate, and the other source is deceleration realized by the negative torque provided by the motor through the transmission shaft, namely electric braking. As long as the proportion of the electric brake is more, more electric power can be recovered.
In view of the design of manual redundant braking, the conventional braking energy recovery system of the electric vehicle usually adopts an overlap regenerative braking system. For the superposition type regenerative braking system, since the brake pedal and the brake wheel cylinder are not decoupled, in a deceleration process, the brake wheel cylinder can generate brake by hydraulic pressure as long as the brake pedal is pressed, and the electric brake is only superposed on the mechanical brake to complete braking. So that a part of energy is lost and the energy recovery rate is low.
Disclosure of Invention
The invention aims to solve the problem of low energy recovery rate of the braking energy recovery system of the conventional electric automobile.
In order to achieve the purpose, the invention provides an electronic brake booster and an electro-hydraulic brake energy recovery system.
According to a first aspect of the present invention, an electronic brake booster is provided.
The electronic brake booster of the present invention includes:
the brake pedal stroke detection unit is used for detecting the brake stroke of the brake pedal;
the brake piston stroke control unit is used for controlling the brake stroke of a brake piston in a brake master cylinder according to an input brake piston stroke control command or the output torque of the brake pedal;
the electronic control clutch unit is used for controlling the brake pedal to be connected with the brake piston stroke control unit according to an input command and controlling the brake pedal to be separated from the brake piston stroke control unit according to an input cutting command;
the electronic control unit is used for outputting the cutting instruction when the braking stroke of the brake pedal does not exceed a preset stroke threshold, acquiring the braking torque required by the whole vehicle according to the braking stroke of the brake pedal and outputting the braking torque to the whole vehicle controller, generating the braking piston stroke control instruction according to the hydraulic braking instruction output by the whole vehicle controller, and outputting the input instruction or the braking piston stroke control instruction according to the braking energy recovery trigging instruction output by the whole vehicle controller; and outputting the input command when the braking stroke of the brake pedal exceeds the stroke threshold.
Preferably, the brake piston stroke control unit comprises a double-shaft motor, a first transmission pair structure and a second transmission pair structure;
an input shaft of the double-shaft motor is linked with the brake pedal sequentially through the electric control clutch unit and the first transmission pair structure;
and the output shaft of the double-shaft motor is linked with the brake piston through the second transmission pair structure.
Preferably, the brake piston stroke control unit further comprises a motor position sensor for detecting a rotation angle of the output shaft of the two-shaft motor, and a motor position information output end of the motor position sensor is connected with a motor position information input end of the electronic control unit.
Preferably, the electronic brake booster further comprises a brake piston stroke detection unit for detecting a brake stroke of the brake piston, and a piston brake stroke data output end of the brake piston stroke detection unit is connected with a piston brake stroke data input end of the electronic control unit.
Preferably, the electronic brake booster further includes a brake pedal pressure detection unit for detecting a pressure applied to the brake pedal, and a pedal pressure data output terminal of the brake pedal pressure detection unit is connected to a pedal pressure data input terminal of the electronic control unit.
Preferably, the electronic brake booster further includes a brake master cylinder pressure detection unit for detecting a pressure of the brake master cylinder, and a master cylinder pressure data output terminal of the brake master cylinder pressure detection unit is connected to a master cylinder pressure data input terminal of the electronic control unit.
Preferably, the electronic brake booster further includes:
a brake pedal feel simulation unit for providing the brake pedal with a resistance for simulating a brake pedal feel when a brake stroke of the brake pedal does not exceed a predetermined stroke threshold.
Preferably, the electronic control unit comprises a processor module, an A/D sampling circuit, an I/O module, a motor driving module, a CAN communication module and a power management module;
the processor module receives pedal stroke data, motor position information, piston brake stroke data and master cylinder pressure data through the A/D sampling circuit;
the processor module receives an ignition signal output by a target vehicle through the I/O module, wherein the ignition signal is an enabling signal of the electronic control unit;
reserving a preset number of I/O interfaces for the I/O module;
the processor module is connected with the double-shaft motor through the motor driving module;
the processor module is connected with the vehicle control unit through a CAN communication module;
the power supply management module is used for supplying power to each power utilization module of the electronic control unit, the brake pedal stroke detection unit, the motor position sensor and the brake pedal pressure detection unit.
According to a second aspect of the present invention, an electro-hydraulic braking energy recovery system is provided.
The electro-hydraulic braking energy recovery system comprises an electronic hydraulic braking subsystem, a braking energy recovery subsystem and a vehicle control unit;
the electronic hydraulic brake subsystem comprises any one of the electronic brake boosters;
the braking energy recovery subsystem is used for controlling a driving motor of the target vehicle to output the maximum regenerative braking torque according to the input braking energy recovery command;
the vehicle control unit is used for responding to the input vehicle demand braking torque and outputting the braking energy recovery instruction, the braking energy recovery instruction and the hydraulic braking instruction or the braking energy recovery non-triggering instruction according to a preset braking torque distribution strategy.
Preferably, the braking torque distribution strategy comprises:
judging whether the current state of the target vehicle meets a preset braking energy recovery triggering condition or not;
if yes, judging whether the braking torque required by the whole vehicle is larger than the maximum regenerative braking torque of a driving motor of the target vehicle;
if the maximum regenerative braking torque is larger than the preset maximum regenerative braking torque, controlling a driving motor of the target vehicle to output the maximum regenerative braking torque, and distributing the difference between the required braking torque of the whole vehicle and the maximum regenerative braking torque of the driving motor to the electronic hydraulic braking subsystem;
and if the maximum regenerative braking torque is not larger than the preset maximum regenerative braking torque, controlling the driving motor to output the maximum regenerative braking torque.
The invention has the beneficial effects that:
the electronic brake booster of the invention detects the brake stroke of the brake pedal through the brake pedal stroke detection unit; controlling the braking stroke of a braking piston in a braking main cylinder through a braking piston stroke control unit according to an input braking piston stroke control command or the output torque of the braking pedal; the electronic control clutch unit controls the brake pedal to be connected with the brake piston stroke control unit according to an input command, and controls the brake pedal to be separated from the brake piston stroke control unit according to an input cut-off command; outputting the cutting instruction when the braking stroke of the brake pedal does not exceed a preset stroke threshold value through an electronic control unit, acquiring the braking torque required by the whole vehicle according to the braking stroke of the brake pedal, outputting the braking torque to a whole vehicle controller, generating a braking piston stroke control instruction according to a hydraulic braking instruction output by the whole vehicle controller, and outputting the input instruction or the braking piston stroke control instruction according to a braking energy recovery triggerless instruction output by the whole vehicle controller; and outputting the input command when the braking stroke of the brake pedal exceeds the stroke threshold.
The electronic brake booster realizes the semi-decoupling of the brake pedal and the brake master cylinder through the electric control clutch unit, namely the brake pedal and the brake master cylinder can be switched between coupling and decoupling, so that the electronic brake booster has the advantages of manual redundant braking function of the existing superposition type regenerative braking system and high energy recovery rate of the existing cooperative type regenerative braking system.
The electro-hydraulic brake energy recovery system of the present invention and the electronic brake booster belong to a general inventive concept, and thus have the same advantageous effects as the electronic brake booster.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic block diagram of an electronic brake booster according to an embodiment of the present invention.
Fig. 2 shows a schematic block diagram of an electronic control unit according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example (b): fig. 1 shows a schematic block diagram of an electronic brake booster according to an embodiment of the present invention. Referring to fig. 1, the electronic brake booster of the present embodiment includes:
the brake pedal stroke detection unit is used for detecting the brake stroke of the brake pedal;
the brake piston stroke control unit is used for controlling the brake stroke of a brake piston in a brake master cylinder according to an input brake piston stroke control command or the output torque of the brake pedal;
the electronic control clutch unit is used for controlling the brake pedal to be connected with the brake piston stroke control unit according to an input command and controlling the brake pedal to be separated from the brake piston stroke control unit according to an input cutting command;
the electronic control unit is used for outputting the cutting instruction when the braking stroke of the brake pedal does not exceed a preset stroke threshold, acquiring the braking torque required by the whole vehicle according to the braking stroke of the brake pedal and outputting the braking torque to the whole vehicle controller, generating the braking piston stroke control instruction according to the hydraulic braking instruction output by the whole vehicle controller, and outputting the input instruction or the braking piston stroke control instruction according to the braking energy recovery trigging instruction output by the whole vehicle controller; and outputting the input command when the braking stroke of the brake pedal exceeds the stroke threshold.
In this embodiment, the brake piston stroke control unit includes a dual-axis motor, a first transmission pair structure and a second transmission pair structure;
an input shaft of the double-shaft motor is linked with the brake pedal sequentially through the electric control clutch unit and the first transmission pair structure;
and the output shaft of the double-shaft motor is linked with the brake piston through the second transmission pair structure.
In this embodiment, the brake piston stroke control unit further includes a motor position sensor for detecting a rotation angle of the output shaft of the dual-shaft motor, and a motor position information output end of the motor position sensor is connected to a motor position information input end of the electronic control unit.
The electronic brake booster of the embodiment further comprises a brake piston stroke detection unit for detecting the brake stroke of the brake piston, and a piston brake stroke data output end of the brake piston stroke detection unit is connected with a piston brake stroke data input end of the electronic control unit.
The electronic brake booster of the present embodiment further includes a brake pedal pressure detecting unit for detecting a pressure applied to the brake pedal, and a pedal pressure data output terminal of the brake pedal pressure detecting unit is connected to a pedal pressure data input terminal of the electronic control unit.
The electronic brake booster of the embodiment further comprises a brake master cylinder pressure detection unit for detecting the pressure of the brake master cylinder, and the master cylinder pressure data output end of the brake master cylinder pressure detection unit is connected with the master cylinder pressure data input end of the electronic control unit.
The electronic brake booster of the present embodiment further includes:
a brake pedal feel simulation unit for providing the brake pedal with a resistance for simulating a brake pedal feel when a brake stroke of the brake pedal does not exceed a predetermined stroke threshold.
Specifically, the brake pedal feel simulation unit of the present embodiment is implemented using a spring.
Fig. 2 shows a schematic block diagram of an electronic control unit according to an embodiment of the invention. Referring to fig. 2, the electronic control unit of the present embodiment includes a processor module, an a/D sampling circuit, an I/O module, a motor driving module, a CAN communication module, and a power management module;
the processor module receives pedal stroke data, motor position information, piston brake stroke data and master cylinder pressure data through the A/D sampling circuit;
the processor module receives an ignition signal output by a target vehicle through the I/O module, wherein the ignition signal is an enabling signal of the electronic control unit;
reserving a preset number of I/O interfaces for the I/O module;
the processor module is connected with the double-shaft motor through the motor driving module;
the processor module is connected with the vehicle control unit through a CAN communication module;
the power supply management module is used for supplying power to each power utilization module of the electronic control unit, the brake pedal stroke detection unit, the motor position sensor and the brake pedal pressure detection unit.
Correspondingly, the embodiment also provides an electro-hydraulic braking energy recovery system.
The electro-hydraulic braking energy recovery system comprises an electronic hydraulic braking subsystem, a braking energy recovery subsystem and a vehicle control unit;
the electronic hydraulic brake subsystem comprises the electronic brake booster of the embodiment;
the braking energy recovery subsystem is used for controlling a driving motor of the target vehicle to output the maximum regenerative braking torque according to the input braking energy recovery command;
the vehicle control unit is used for responding to the input vehicle demand braking torque and outputting the braking energy recovery instruction, the braking energy recovery instruction and the hydraulic braking instruction or the braking energy recovery non-triggering instruction according to a preset braking torque distribution strategy.
In this embodiment, the braking torque distribution strategy includes:
judging whether the current state of the target vehicle meets a preset braking energy recovery triggering condition or not;
if yes, judging whether the braking torque required by the whole vehicle is larger than the maximum regenerative braking torque of a driving motor of the target vehicle;
if the maximum regenerative braking torque is larger than the preset maximum regenerative braking torque, controlling a driving motor of the target vehicle to output the maximum regenerative braking torque, and distributing the difference between the required braking torque of the whole vehicle and the maximum regenerative braking torque of the driving motor to the electronic hydraulic braking subsystem;
and if the maximum regenerative braking torque is not larger than the preset maximum regenerative braking torque, controlling the driving motor to output the maximum regenerative braking torque.
The present embodiment is described in more detail below:
1. modifying a braking system:
the electronic brake booster senses the stroke of the brake pedal and the braking intention of a driver by using the pedal stroke sensor, transmits signals to the electronic control unit and drives the motor, and the motor drives the transmission parts such as the worm, the turbine, the gear, the rack and the like and pushes the brake master cylinder to work, so that the electric servo brake is realized. The electronic brake booster is used for replacing a vacuum boosting brake system of an original vehicle, boosting brake and line control brake can be realized on the same vehicle, and meanwhile, brake energy recovery is supported. Can be seamlessly interfaced with an ADAS system and an intelligent driving system.
Specifically, the modification comprises the following steps:
reserving a basic braking system of the original vehicle;
a novel electro-hydraulic brake assembly is adopted to replace a vacuum booster of an original vehicle;
the method comprises the following steps of (1) harness transformation and brake system controller installation;
a master cylinder pressure sensor is adopted to monitor brake build-up pressure, and closed-loop control is formed by combining vehicle speed signal sampling and servo motor current feedback;
the method comprises the steps that a pedal travel sensor is used for collecting the braking intention of a driver, an ECU calculates target braking force, the magnitude of regenerative braking torque which CAN be provided by a vehicle is obtained through a CAN, and braking force distribution is carried out;
and the power-assisted braking and energy recovery are realized by combined debugging.
2. The hardware architecture of the system is as follows:
the electronic control unit is powered by a 12V vehicle-mounted power supply, an ignition signal of a whole automobile ACC serves as an enabling signal of the electronic brake booster, and the electronic control unit mainly comprises a processor unit, a power management module, a brake motor driving module, a whole automobile CAN communication module, an ignition signal (ACC), a pedal stroke acquisition interface, a main cylinder stroke acquisition interface, a pedal force acquisition interface, a main cylinder pressure acquisition interface, a motor position acquisition interface and the like.
The electronic control unit is responsible for system control of the electronic brake booster, including signal processing, control decisions, and fault diagnosis. The power management module is responsible for supplying power to the processor unit and providing a power failure diagnosis function; the brake motor module provides brake motor drive; a whole vehicle CAN communication module acquires a whole vehicle signal (including ESC information, vehicle speed and the like); the ignition signal provides a start enabling signal of the electronic brake booster; the other ports are responsible for obtaining pedal travel, master cylinder travel, pedal force and master cylinder pressure information.
3. The system software architecture is as follows:
the electronic brake booster senses the brake request of a driver through a pedal travel sensor, and a brake pedal control system calculates the required pedal force to obtain the master cylinder pressure required by the braking of the whole vehicle (the master cylinder pressure of the braking of the whole vehicle and the braking deceleration of the whole vehicle are in a linear relation). The maximum regenerative braking torque which CAN be provided by the whole vehicle is obtained through CAN communication, braking force distribution is carried out, the braking torque of the whole vehicle is obtained and sent to the VCU for regenerative braking, and the insufficient braking force is supplemented through friction braking. Therefore, the maximum braking energy recovery efficiency is realized under the condition of not changing the feeling of the brake pedal.
4. The system software architecture is as follows:
the driver steps on the brake pedal, the electronic brake booster calculates the total braking torque required by the whole vehicle, and the braking torque is sent to the VCU of the whole vehicle through the CAN of the whole vehicle. The whole VCU judges whether the current state of the vehicle can carry out energy recovery (the judgment condition is that the vehicle speed is more than 15km/h, the vehicle SOC is less than 90 percent, and the vehicle energy recovery system has no fault). And the VCU of the whole vehicle judges whether the maximum allowable braking torque of the current power motor meets the current braking torque requirement. And if the currently allowed maximum braking torque of the motor can meet the braking force requirement of the whole vehicle, the VCU of the whole vehicle responds with the maximum total braking force of the whole vehicle, and the regenerative braking is carried out. And simultaneously, the current torque of the driving motor is sent to the whole CAN in real time. And if the current allowable maximum braking torque of the motor cannot meet the braking force requirement of the whole vehicle, the whole vehicle VCU performs regenerative braking with the maximum braking torque allowed by the vehicle, and simultaneously sends the current torque of the driving motor to the whole vehicle CAN in real time.
The electronic brake booster of the embodiment has the following beneficial effects:
firstly, the boosting brake function can be realized, and boosting control is smooth.
And secondly, the brake-by-wire function can be realized, and the response speed of the brake-by-wire is high.
Thirdly, the brake pedal feel can be designed.
Fourthly, braking energy recovery is supported.
The electronic brake booster of this embodiment can satisfy the braking energy recovery of new energy automobile demand, and the automatic driving system control vehicle braking of being convenient for, and the redundant braking system of taking over at any time of artifical braking carries out the vehicle braking simultaneously. The embodiment can be applied to active ADAS or boost enhancement of adaptive cruise control, autonomous emergency braking, electronic stability systems, emergency braking systems, hill start assist, and the like. The embodiment is suitable for various types of automobiles adopting the hydraulic braking system.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An electronic brake booster, comprising:
the brake pedal stroke detection unit is used for detecting the brake stroke of the brake pedal;
the brake piston stroke control unit is used for controlling the brake stroke of a brake piston in a brake master cylinder according to an input brake piston stroke control command or the output torque of the brake pedal;
the electronic control clutch unit is used for controlling the brake pedal to be connected with the brake piston stroke control unit according to an input command and controlling the brake pedal to be separated from the brake piston stroke control unit according to an input cutting command;
the electronic control unit is used for outputting the cutting instruction when the braking stroke of the brake pedal does not exceed a preset stroke threshold, acquiring the braking torque required by the whole vehicle according to the braking stroke of the brake pedal and outputting the braking torque to the whole vehicle controller, generating the braking piston stroke control instruction according to the hydraulic braking instruction output by the whole vehicle controller, and outputting the input instruction or the braking piston stroke control instruction according to the braking energy recovery trigging instruction output by the whole vehicle controller; and outputting the input command when the braking stroke of the brake pedal exceeds the stroke threshold.
2. An electronic brake booster according to claim 1 wherein the brake piston stroke control unit comprises a dual-axis motor, a first transmission pair arrangement and a second transmission pair arrangement;
an input shaft of the double-shaft motor is linked with the brake pedal sequentially through the electric control clutch unit and the first transmission pair structure;
and the output shaft of the double-shaft motor is linked with the brake piston through the second transmission pair structure.
3. An electronic brake booster according to claim 2, wherein the brake piston stroke control unit further includes a motor position sensor for detecting a rotation angle of the output shaft of the two-shaft motor, and a motor position information output terminal of the motor position sensor is connected to a motor position information input terminal of the electronic control unit.
4. An electronic brake booster according to claim 3 further comprising a brake piston stroke detection unit for detecting the braking stroke of the brake piston, the piston brake stroke data output of the brake piston stroke detection unit being connected to the piston brake stroke data input of the electronic control unit.
5. An electronic brake booster according to claim 4 further comprising a brake pedal pressure detection unit for detecting pressure applied to the brake pedal, the brake pedal pressure detection unit having a pedal pressure data output connected to a pedal pressure data input of the electronic control unit.
6. An electronic brake booster according to claim 5, further comprising a master cylinder pressure detection unit for detecting the master cylinder pressure, the master cylinder pressure data output of the master cylinder pressure detection unit being connected to the master cylinder pressure data input of the electronic control unit.
7. The electronic brake booster of claim 6, further comprising:
a brake pedal feel simulation unit for providing the brake pedal with a resistance for simulating a brake pedal feel when a brake stroke of the brake pedal does not exceed a predetermined stroke threshold.
8. The electronic brake booster of claim 7 wherein the electronic control unit includes a processor module, an a/D sampling circuit, an I/O module, a motor drive module, a CAN communication module, and a power management module;
the processor module receives pedal stroke data, motor position information, piston brake stroke data and master cylinder pressure data through the A/D sampling circuit;
the processor module receives an ignition signal output by a target vehicle through the I/O module, wherein the ignition signal is an enabling signal of the electronic control unit;
reserving a preset number of I/O interfaces for the I/O module;
the processor module is connected with the double-shaft motor through the motor driving module;
the processor module is connected with the vehicle control unit through a CAN communication module;
the power supply management module is used for supplying power to each power utilization module of the electronic control unit, the brake pedal stroke detection unit, the motor position sensor and the brake pedal pressure detection unit.
9. An electro-hydraulic braking energy recovery system is characterized by comprising an electronic hydraulic braking subsystem, a braking energy recovery subsystem and a vehicle control unit;
the electro-hydraulic brake subsystem including the electronic brake booster of any of claims 1-8;
the braking energy recovery subsystem is used for controlling a driving motor of the target vehicle to output the maximum regenerative braking torque according to the input braking energy recovery command;
the vehicle control unit is used for responding to the input vehicle demand braking torque and outputting the braking energy recovery instruction, the braking energy recovery instruction and the hydraulic braking instruction or the braking energy recovery non-triggering instruction according to a preset braking torque distribution strategy.
10. The electro-hydraulic braking energy recovery system of claim 9, wherein the braking torque distribution strategy comprises:
judging whether the current state of the target vehicle meets a preset braking energy recovery triggering condition or not;
if yes, judging whether the braking torque required by the whole vehicle is larger than the maximum regenerative braking torque of a driving motor of the target vehicle;
if the maximum regenerative braking torque is larger than the preset maximum regenerative braking torque, controlling a driving motor of the target vehicle to output the maximum regenerative braking torque, and distributing the difference between the required braking torque of the whole vehicle and the maximum regenerative braking torque of the driving motor to the electronic hydraulic braking subsystem;
and if the maximum regenerative braking torque is not larger than the preset maximum regenerative braking torque, controlling the driving motor to output the maximum regenerative braking torque.
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| CN202110090609.2A CN112706738A (en) | 2021-01-22 | 2021-01-22 | Electronic brake booster and electro-hydraulic brake energy recovery system |
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| CN202110090609.2A CN112706738A (en) | 2021-01-22 | 2021-01-22 | Electronic brake booster and electro-hydraulic brake energy recovery system |
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| CN113460014A (en) * | 2021-07-28 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Control method for deceleration of brake tail end of electric automobile |
| CN113734129A (en) * | 2021-11-03 | 2021-12-03 | 杭州重河新能源科技有限公司 | Hydraulic system for realizing high-efficiency energy regenerative braking of new energy vehicle |
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| CN105774788A (en) * | 2016-03-04 | 2016-07-20 | 吉林大学 | Electric power-assisted braking system with composite functions |
| CN106004826A (en) * | 2016-06-03 | 2016-10-12 | 北京英创汇智科技有限公司 | Semi-decoupling brake system used for regenerative braking of new energy automobile |
| CN109624957A (en) * | 2019-02-26 | 2019-04-16 | 吉林大学 | A kind of integrated electric energy assisted braking system with novel coupled modes |
| CN110816283A (en) * | 2019-09-29 | 2020-02-21 | 浙江合众新能源汽车有限公司 | Braking energy recovery control system and method for electric automobile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113460014A (en) * | 2021-07-28 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Control method for deceleration of brake tail end of electric automobile |
| CN113734129A (en) * | 2021-11-03 | 2021-12-03 | 杭州重河新能源科技有限公司 | Hydraulic system for realizing high-efficiency energy regenerative braking of new energy vehicle |
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Application publication date: 20210427 |