CN218949160U - Electric automobile EHB and EMB composite braking integrated control device - Google Patents
Electric automobile EHB and EMB composite braking integrated control device Download PDFInfo
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- CN218949160U CN218949160U CN202320077639.4U CN202320077639U CN218949160U CN 218949160 U CN218949160 U CN 218949160U CN 202320077639 U CN202320077639 U CN 202320077639U CN 218949160 U CN218949160 U CN 218949160U
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Abstract
The utility model discloses an EHB and EMB composite brake integrated control device of an electric automobile, which comprises a brake pedal, a pedal simulator, an induction unit, an integrated controller, a brake distribution controller, an EHB actuator and an EMB actuator, wherein the EHB actuator is used for applying an actual braking force to a front axle of the automobile, and the EMB actuator is used for applying an actual braking force to a rear axle of the automobile. The brake integrated control device simultaneously utilizes the advantages of the EHB and the EMB, makes up the defects of the EHB and the EMB, designs an integrated control strategy, performs the EHB and the EMB composite control, can effectively reduce the cost, and improves the brake control efficiency and the active safety performance of the automobile running. In addition, the front axle of the automobile adopts an EHB actuator, an additional failure backup mechanism is not needed, the reliability and the safety of the system are ensured, complex hydraulic pipelines of the rear axle are reduced, the use amount of hydraulic oil is reduced, the axle load moves forward during braking, the braking requirement of the system on the rear axle is smaller, the requirement on the performance of an EMB motor is reduced, and the vehicle-mounted 12V power supply can meet the braking requirement.
Description
Technical Field
The utility model relates to the technical field of riding brake control systems, and particularly discloses an EHB and EMB composite brake integrated control device of an electric automobile.
Background
Electro-hydraulic brake systems (EHB) and electro-mechanical brake systems (EMB) are two advanced brake-by-wire systems, which differ in that EHB uses non-human power as a power source, but still retains a portion of the hydraulic lines; the EMB uses the motor as a power source, so that the response is faster, a hydraulic pipeline is completely canceled, brake fluid is abandoned, the braking response is improved, meanwhile, the EMB is more economical and environment-friendly, and the EMB is more convenient to apply in hybrid electric vehicles and electric vehicles.
In the prior art, the technology similar to the function of the utility model comprises a wheel cylinder hydraulic pressure control system and method of an electronic hydraulic brake system (application number 2014100084011) and an electronic mechanical brake control system and an automobile (application number 2011104262739), wherein the former technology mainly controls EHB, the latter technology mainly controls EMB, and the common point of the EHB and the EMB is that parts such as a brake master cylinder and vacuum assistance are omitted, so that the structure of the brake system is simpler and more compact; meanwhile, the electronic brake pedal is adopted to replace the traditional brake pedal, so that the brake consciousness recognition of a driver is easy to realize, good pedal feel is provided for the driver, the phenomenon of pedal shake can be avoided when the ABS is started, and the electronic brake pedal are both non-manpower power sources and have high brake efficiency. However, the EHB system has complex pipelines and inconvenient arrangement, and meanwhile, the rear axle tube is too long, so that certain hysteresis exists in braking response; the EMB needs an additional braking failure backup mechanism, the complexity of the system is increased, the EMB needs four sets of execution mechanisms, and meanwhile, a vehicle-mounted 42V power supply is needed to meet the power requirement, so that the cost is high.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide the EHB and EMB composite braking integrated control device for the electric automobile, which uses a singlechip as a control center, uses a composite braking system with a front axle as an EHB system and a rear axle as an EMB system, is convenient for integrating ABS, TCS, ESP, EBD, EPB and other auxiliary braking systems, and simultaneously uses the advantages of the EHB and the EMB to make up for the defects of the EHB and the EMB, designs an integrated control strategy, performs the EHB and EMB composite control, can effectively reduce the cost, improve the braking control efficiency and improve the active safety performance of automobile running.
In order to achieve the aim, the utility model relates to an EHB and EMB composite brake integrated control device of an electric automobile, which comprises a brake pedal, a pedal simulator, an induction unit, an integrated controller, a brake distribution controller, an EHB actuator and an EMB actuator,
the brake pedal is connected to the pedal simulator and used for triggering the pedal simulator to generate a target braking force signal; the pedal simulator is connected with the integrated controller and is used for setting target braking force of the front axle and the rear axle of the automobile, and when the target braking force is greater than the threshold value of the pedal simulator, the pedal simulator sends a trigger signal to the integrated controller; the sensing unit is in signal connection with the integrated controller and is used for generating a feedback signal;
the integrated controller is connected with the brake distribution controller and is used for generating a decision instruction according to the feedback signal;
the brake distribution controller is respectively connected with the EHB actuator and the EMB actuator and is used for distributing target braking force to the front and rear axles of the automobile according to the decision instruction;
the EHB actuator is used for applying braking force to the front axle of the automobile;
the EMB actuator is used to apply a braking force to the rear axle of the automobile.
Specifically, the sensing unit comprises a pedal sensor and a brake pressure sensor, the pedal sensor comprises a pedal pressure sensor and a pedal displacement sensor, the pedal pressure sensor is used for collecting a pressure signal applied to a brake pedal by a driver and transmitting the pressure signal to the integrated controller, and the pedal displacement sensor is used for transmitting a displacement signal generated by the brake pedal when the driver presses the brake pedal and transmitting the displacement signal to the integrated controller; the brake pressure sensor is used for transmitting brake pressure signals of the brakes to the integrated controller, and the integrated controller is used for generating a decision instruction according to the pressure signals, the displacement signals and the brake pressure signals.
The EHB actuator comprises an electronic control unit, an energy accumulator, a hydraulic pump, an electrohydraulic brake valve and a hydraulic brake, wherein the electronic control unit is in signal connection with a pedal sensor, the electronic control unit is respectively and electrically connected with the hydraulic pump and the electrohydraulic brake valve, the hydraulic pump is connected with the electrohydraulic brake valve through the energy accumulator, the electrohydraulic brake valve is arranged between the energy accumulator and the hydraulic brake, and the hydraulic brake is used for applying braking force to each wheel of an automobile;
the electronic control unit is used for collecting feedback signals generated by the pedal sensor, and sending instructions to control the hydraulic pump and the electrohydraulic brake valve to work according to the feedback signals, and the hydraulic pump and the electrohydraulic brake valve work cooperatively to drive and control the hydraulic brake to generate braking action.
Specifically, the electronic control unit comprises a signal input module, a main control module and an actuator driving module, wherein the signal input module is connected with the main control module and is used for transmitting a feedback signal generated by the pedal sensor to the main control module;
the main control module is connected with the actuator driving module and is used for sending out an instruction to control the actuator driving module to work; the actuator driving module is used for driving the electrohydraulic brake valve to work.
Specifically, the EMB actuator comprises a central control module, a control unit, a brake actuating mechanism and a brake disc, wherein the central control module is respectively connected with the control unit and a pedal sensor, the control unit is electrically connected with the brake actuating mechanism, the brake actuating mechanism is connected with the brake disc, and the brake disc is used for applying braking force to wheels of an automobile.
In particular, the EMB actuator further comprises a battery for powering the central control module.
Specifically, the number of the control units, the brake actuating mechanisms and the brake discs is 4, each control unit independently controls one brake actuating mechanism and one brake disc, and each brake disc independently brakes one wheel.
Specifically, the brake pressure sensor is in signal connection with the control unit, via which the brake pressure sensor transmits a feedback signal to the central control module.
The utility model has the beneficial effects that: the utility model relates to an EHB and EMB composite brake integrated control device of an electric automobile, which comprises a brake pedal, a pedal simulator, an induction unit, an integrated controller, a brake distribution controller, an EHB actuator and an EMB actuator, wherein the EHB actuator is used for applying actual braking force to a front axle of the automobile, and the EMB actuator is used for applying actual braking force to a rear axle of the automobile. The EHB and EMB composite braking integrated control device for the electric automobile utilizes the advantages of the EHB and the EMB at the same time, makes up the defects of the EHB and the EMB, designs an integrated control strategy, and performs EHB and EMB composite control, so that the cost can be effectively reduced, the braking control efficiency is improved, and the active safety performance of automobile running is improved. In addition, the front axle of the automobile adopts an EHB actuator, an additional failure backup mechanism is not needed, the reliability and the safety of the system are ensured, complex hydraulic pipelines of the rear axle are reduced, the use amount of hydraulic oil is reduced, the axle load moves forward during braking, the braking requirement of the system on the rear axle is smaller, the requirement on the performance of an EMB motor is reduced, and the vehicle-mounted 12V power supply can meet the braking requirement.
Drawings
FIG. 1 is a schematic illustration of the present utility model;
FIG. 2 is a schematic block diagram of an EHB actuator of the present utility model;
FIG. 3 is a schematic illustration of the structure of an EHB actuator of the present utility model;
FIG. 4 is a schematic block diagram of an EMB actuator of the present utility model;
fig. 5 is a schematic structural view of the EMB actuator of the utility model.
Reference numerals: 1. a brake pedal; 2. a pedal simulator; 3. a pedal sensor; 4. a pedal pressure sensor; 5. a pedal displacement sensor; 6. an electronic control unit; 7. an accumulator; 8. a hydraulic pump; 9. an electrohydraulic brake valve; 10. a hydraulic brake; 11. a central control module; 12. a control unit; 13. a brake actuator; 14. a brake disc; 15. and a battery.
Detailed Description
The present utility model will be further described with reference to examples and drawings, which are not intended to be limiting, for the understanding of those skilled in the art.
Referring to fig. 1 to 5, the electric vehicle EHB and EMB composite brake integrated control device of the present utility model adopts a single chip microcomputer as a control center, and includes a brake pedal 1, a pedal simulator 2, an induction unit, an integrated controller, a brake distribution controller, an EHB actuator and an EMB actuator, wherein the brake pedal 1 is connected to the pedal simulator 2 and is used for triggering the pedal simulator 2 to generate a target braking force signal;
the pedal simulator 2 is connected to the integrated controller and is used for setting target braking forces of front and rear axles of the automobile;
the sensing unit is in signal connection with the integrated controller and is used for generating a feedback signal;
the integrated controller is connected with the brake distribution controller and is used for generating a decision instruction according to the feedback signal, and the integrated controller is also integrated with auxiliary brake systems such as ABS, TCS, ESP, EBD, EPB;
the brake distribution controller is respectively connected with the EHB actuator and the EMB actuator, and is used for distributing target braking force to the front axle and the rear axle of the automobile according to the decision instruction, sending the target braking force distributed to the front axle to the EHB actuator by a control signal, and sending the target braking force distributed to the rear axle to the EMB actuator by a control signal;
the EHB actuator is used for applying braking force to the front axle of the automobile;
the EMB actuator is used to apply a braking force to the rear axle of the automobile.
The EHB and EMB composite braking integrated control device for the electric automobile utilizes the advantages of the EHB and the EMB at the same time, makes up the defects of the EHB and the EMB, designs an integrated control strategy, and performs EHB and EMB composite control, so that the cost can be effectively reduced, the braking control efficiency is improved, and the active safety performance of automobile running is improved.
Specifically, the integrated control strategy is realized based on accurate follow-up control of the front and rear axle braking forces Fbf and Fbr, and aims to coordinate and distribute the target braking force Fb according to different actuator requirements when the front and rear axle brakes acquire different braking requirements, and optimize the response of the actuator to obtain an optimal execution effect. The input of the control device is the braking intention of a driver, the control device decides the target braking force of the front axle and the rear axle according to the control requirements of ABS, EBD, ESP, TCS, EPB and the like, the integrated controller distributes the braking force integrated control strategy based on different dynamic characteristics of the EHB actuator and the EMB actuator, then forms a decision instruction and sends the decision instruction to the braking distribution controller, and the braking distribution controller sends the control instruction to the EHB actuator and the EMB actuator after receiving the control instruction, and the EHB actuator and the EMB actuator distribute the target braking force of each brake according to the braking requirements of different brakes so as to enable the whole vehicle to rapidly and stably finish the braking process.
Specifically, the sensing unit comprises a pedal sensor 3 and a brake pressure sensor, the pedal sensor 3 comprises a pedal pressure sensor 4 and a pedal displacement sensor 5, the pedal pressure sensor 4 is used for collecting a pressure signal applied to the brake pedal 1 by a driver and transmitting the pressure signal to the integrated controller, and the pedal displacement sensor 5 is used for transmitting a displacement signal generated by the brake pedal 1 when the driver depresses the brake pedal 1 and transmitting the displacement signal to the integrated controller; the brake pressure sensor is used for transmitting brake pressure signals of the brakes to the integrated controller, and the integrated controller is used for generating a decision instruction according to the pressure signals, the displacement signals and the brake pressure signals.
Referring to fig. 2 to 3, the EHB actuator includes an electronic control unit 6, an accumulator 7, a hydraulic pump 8, an electrohydraulic brake valve 9 and a hydraulic brake 10, wherein the electronic control unit 6 is in signal connection with the pedal sensor 3, the electronic control unit 6 is respectively electrically connected with the hydraulic pump 8 and the electrohydraulic brake valve 9, the hydraulic pump 8 and the electrohydraulic brake valve 9 are connected via the accumulator 7, the electrohydraulic brake valve 9 is arranged between the accumulator 7 and the hydraulic brake 10, the electrohydraulic brake valve 9 includes a liquid inlet electromagnetic valve, a liquid outlet electromagnetic valve and a high-speed switch valve, and the hydraulic brake 10 is used for applying braking force to each wheel of an automobile;
the electronic control unit 6 is used for collecting feedback signals generated by the pedal sensor 3, and sending instructions to control the hydraulic pump 8 and the electrohydraulic brake valve 9 to work according to the feedback signals, and the hydraulic pump 8 and the electrohydraulic brake valve 9 work cooperatively to drive and control the hydraulic brake 10 to generate braking action.
Specifically, the electronic control unit 6 includes a signal input module, a main control module, and an actuator driving module, where the signal input module is connected to the main control module and is used to transmit a feedback signal generated by the pedal sensor 3 to the main control module;
the main control module is connected with the actuator driving module and is used for sending out an instruction to control the actuator driving module to work; the actuator driving module is used for driving the electrohydraulic brake valve 9 to work.
In the process of producing displacement of the brake pedal 1, the signal input module inputs feedback signals of the pedal sensor 3, each brake pressure sensor and the like which are acquired into the electronic control unit 6 for analysis and judgment, the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve are respectively regulated, and when the electronic hydraulic brake system needs to be pressurized, the liquid inlet electromagnetic valve is opened, and the liquid outlet electromagnetic valve is closed; when the electronic hydraulic braking system needs pressure maintaining, the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve are closed; when the electro-hydraulic braking system needs to be depressurized, the liquid inlet electromagnetic valve is closed, and the liquid outlet electromagnetic valve is opened. The brake pressure on each wheel is controlled by inputting a PWM control signal to the high-speed switching valve. The ECU CAN also receive the dynamic data of the automobile from ABS, ASR, ESP through the CAN bus technology, and send the control signal to the corresponding control unit 12 for the optimal control of the automobile through analysis and processing.
Referring to fig. 4 to 5, the EMB actuator includes a central control module 11, a control unit 12, a brake actuator 13 and a brake disc 14, wherein the central control module 11 is connected with the control unit 12 and the pedal sensor 3 respectively, the central control module 11 and the control unit 12 are of a conventional structure, the control unit 12 is electrically connected with the brake actuator 13, the brake actuator 13 is connected with the brake disc 14, and the brake disc 14 is used for applying braking force to each wheel of the automobile. The EMB actuator further comprises a battery 15, the battery 15 being arranged to power the central control module 11, the battery 15 further providing power to the control unit 12, the brake actuator 13 and the brake disc 14 via the central control module 11. The number of the control units 12, the brake actuating mechanisms 13 and the brake discs 14 is 4, and each control unit 12 independently controls one brake actuating mechanism 13 and one brake disc 14, and each brake disc 14 independently brakes one wheel. The brake pressure sensor is in signal connection with the control unit 12, which brake pressure sensor transmits a feedback signal via the control unit 12 to the central control module 11.
The central control module 11 recognizes the intention of a driver according to the signals transmitted by the pedal simulator 2, obtains the running state of the whole vehicle according to various sensors such as the vehicle speed, the wheel speed and the like, comprehensively processes various information, then sends corresponding braking signals to the 4 control units 12, and after the 4 control units 12 obtain the signals, controls the 4 braking execution mechanisms 13 to enable the 4 brake discs 14 to independently brake the 4 wheels. The information such as the actual braking moment of each brake is fed back to the central control module 11 through the braking pressure sensor, so that closed-loop control is formed, and the optimal braking effect is ensured. The braking force and braking time of the electric control brake are controlled by the central control module 11, so that the functions of braking safety control can be realized in a centralized way only by writing programs with the functions of ABS, TCS, ESP and the like into the central control module 11 without adding additional hardware equipment.
The specific implementation steps of the utility model are as follows:
s1: when the driver presses the brake pedal 1, a signal is acquired by the pedal simulator 2 to obtain a target braking force and a target braking strength of the vehicle, and the signal is an input signal of the integrated controller.
S2: the integrated controller distributes braking force according to the target, and compares the braking force with the actual braking force transmitted by the braking pressure sensor through calculation, analysis and judgment, and if the braking force is within a specified range, the braking force of the front shaft and the rear shaft is determined to meet the requirement, and braking force control is not performed.
S3: the integrated controller is used for carrying out calculation, analysis and judgment, and if the braking force difference of the front axle and the rear axle is determined to exceed the receiving range, the integrated controller is used for carrying out integrated control distribution on the braking force of the front axle and the rear axle, and the integrated controller is used for transmitting a corresponding decision instruction to the brake distribution controller.
S4: and the brake distribution controller sends out control instructions to the EHB actuator and the EMB actuator according to the decision instructions of the integrated controller.
S5: the control command is input to the front and rear axle actuators, the EHB actuator and the EMB actuator both take the braking force to be distributed as a target, the supercharging process is started, the system detects the actual braking force of the front and rear axles in real time in the running process, and the front and rear axle braking forces simultaneously reach the target braking force, namely the braking force of the whole automobile reaches the target braking force.
The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.
Claims (8)
1. An electric automobile EHB and EMB composite braking integrated control device which characterized in that: comprises a brake pedal (1), a pedal simulator (2), an induction unit, an integrated controller, a brake distribution controller, an EHB actuator and an EMB actuator,
the brake pedal (1) is connected to the pedal simulator (2) and is used for triggering the pedal simulator (2) to generate a target braking force signal;
the pedal simulator (2) is connected with the integrated controller and is used for setting target braking force of front and rear axles of the automobile, and when the target braking force is greater than the threshold value of the pedal simulator (2), the pedal simulator (2) sends a trigger signal to the integrated controller;
the sensing unit is in signal connection with the integrated controller and is used for generating a feedback signal;
the integrated controller is connected with the brake distribution controller and is used for generating a decision instruction according to the feedback signal;
the brake distribution controller is respectively connected with the EHB actuator and the EMB actuator and is used for distributing target braking force to the front and rear axles of the automobile according to the decision instruction;
the EHB actuator is used for applying braking force to the front axle of the automobile;
the EMB actuator is used to apply a braking force to the rear axle of the automobile.
2. The electric vehicle EHB and EMB composite brake integrated control device according to claim 1, wherein: the sensing unit comprises a pedal sensor (3) and a brake pressure sensor, the pedal sensor (3) comprises a pedal pressure sensor (4) and a pedal displacement sensor (5), the pedal pressure sensor (4) is used for collecting pressure signals applied to the brake pedal (1) by a driver and transmitting the pressure signals to the integrated controller, and the pedal displacement sensor (5) is used for transmitting displacement signals generated by the brake pedal (1) when the driver presses the brake pedal (1) and transmitting the displacement signals to the integrated controller; the brake pressure sensor is used for transmitting brake pressure signals of the brakes to the integrated controller, and the integrated controller is used for generating a decision instruction according to the pressure signals, the displacement signals and the brake pressure signals.
3. The electric vehicle EHB and EMB composite brake integrated control device according to claim 2, wherein: the EHB actuator comprises an electronic control unit (6), an energy accumulator (7), a hydraulic pump (8), an electrohydraulic brake valve (9) and a hydraulic brake (10), wherein the electronic control unit (6) is in signal connection with a pedal sensor (3), the electronic control unit (6) is respectively and electrically connected with the hydraulic pump (8) and the electrohydraulic brake valve (9), the hydraulic pump (8) is connected with the electrohydraulic brake valve (9) through the energy accumulator (7), the electrohydraulic brake valve (9) is arranged between the energy accumulator (7) and the hydraulic brake (10), and the hydraulic brake (10) is used for applying braking force to each wheel of an automobile;
the electronic control unit (6) is used for collecting feedback signals generated by the pedal sensor (3) and sending instructions to control the hydraulic pump (8) and the electrohydraulic brake valve (9) to work according to the feedback signals, and the hydraulic pump (8) and the electrohydraulic brake valve (9) work cooperatively to drive and control the hydraulic brake (10) to generate braking actions.
4. The electric vehicle EHB and EMB composite brake integrated control device according to claim 3, wherein: the electronic control unit (6) comprises a signal input module, a main control module and an actuator driving module, wherein the signal input module is connected with the main control module and is used for transmitting a feedback signal generated by the pedal sensor (3) to the main control module;
the main control module is connected with the actuator driving module and is used for sending out an instruction to control the actuator driving module to work; the actuator driving module is used for driving the electrohydraulic brake valve (9) to work.
5. The electric vehicle EHB and EMB composite brake integrated control device according to claim 2, wherein: the EMB actuator comprises a central control module (11), a control unit (12), a brake actuating mechanism (13) and a brake disc (14), wherein the central control module (11) is respectively connected with the control unit (12) and the pedal sensor (3), the control unit (12) is electrically connected with the brake actuating mechanism (13), the brake actuating mechanism (13) is connected with the brake disc (14), and the brake disc (14) is used for applying braking force to wheels of an automobile.
6. The electric vehicle EHB and EMB composite brake integrated control device according to claim 5, wherein: the EMB actuator further comprises a battery (15), the battery (15) being arranged to power the central control module (11).
7. The electric vehicle EHB and EMB composite brake integrated control device according to claim 5, wherein: the number of the control units (12), the brake actuating mechanisms (13) and the brake discs (14) is 4, each control unit (12) independently controls one brake actuating mechanism (13) and one brake disc (14), and each brake disc (14) independently brakes one wheel.
8. The electric vehicle EHB and EMB composite brake integrated control device according to claim 7, wherein: the brake pressure sensor is in signal connection with the control unit (12), and the brake pressure sensor transmits a feedback signal to the central control module (11) via the control unit (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320077639.4U CN218949160U (en) | 2023-01-09 | 2023-01-09 | Electric automobile EHB and EMB composite braking integrated control device |
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| CN202320077639.4U CN218949160U (en) | 2023-01-09 | 2023-01-09 | Electric automobile EHB and EMB composite braking integrated control device |
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