CN116279366A - Brake-by-wire system with redundant backup brake and control method - Google Patents

Brake-by-wire system with redundant backup brake and control method Download PDF

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Publication number
CN116279366A
CN116279366A CN202111516832.5A CN202111516832A CN116279366A CN 116279366 A CN116279366 A CN 116279366A CN 202111516832 A CN202111516832 A CN 202111516832A CN 116279366 A CN116279366 A CN 116279366A
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CN
China
Prior art keywords
braking
brake
module
electric control
wire system
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Pending
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CN202111516832.5A
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Chinese (zh)
Inventor
徐文泉
林新春
张升
袁永彬
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WUHU BETHEL ELECTRONIC CONTROL SYSTEMS CO Ltd
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WUHU BETHEL ELECTRONIC CONTROL SYSTEMS CO Ltd
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Priority to CN202111516832.5A priority Critical patent/CN116279366A/en
Publication of CN116279366A publication Critical patent/CN116279366A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B60T13/148—Arrangements for pressure supply
    • 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
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • B60T15/025—Electrically controlled valves
    • B60T15/028—Electrically controlled valves in hydraulic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention provides a brake-by-wire system with redundant backup braking and a control method, which belong to the field of vehicle braking.

Description

Brake-by-wire system with redundant backup brake and control method
Technical Field
The invention relates to the field of vehicle braking, in particular to a brake-by-wire system with redundant backup braking and a control method.
Background
The power assisting of the traditional automobile brake system is realized by utilizing vacuum generated by the operation of an engine or vacuum generated by the operation of an electronic vacuum pump in a vacuum booster. As shown in fig. 4, reference numeral 4 is the vacuum booster. When a driver presses a brake pedal 6 during braking, a brake master cylinder 3 is driven to pass through an electric control pressure regulating unit ABS/ESC2, and pressure is built up on a brake 1 to generate brake fluid pressure; in the process, a vacuum booster is needed to amplify the pedal force proportionally, so that a driver can realize braking force meeting the braking requirement of the whole vehicle under proper pedal feel.
With the development of new energy technology and braking technology of automobiles, an increasing demand is being generated for a braking system without vacuum assistance. Mainly in two aspects: firstly, the development of new energy automobiles, such as electric automobiles, does not need an external electronic vacuum pump to carry out a vacuum pumping power source-an engine for a vacuum booster on the whole automobile, and has the defects of obvious electric energy consumption and noise; secondly, active safety braking technology is developed, for example, a vehicle can identify expected danger after being matched with radar waves or visual sensors, and the vehicle is actively braked or emergently braked to avoid collision.
As a result, the art of the brake-by-wire system has been developed, and prior art publication 201910331828.8 shows a brake-by-wire system scheme composed of a driver input unit, a pedal simulator, a booster unit, a circuit control valve, a wheel end control valve group, and a controller ECU.
At present, vehicles gradually develop to the aspect of automatic driving, and when the prior art is above the automatic driving level L3 and L3, the technical scheme is required to additionally add redundant electric control braking, for example, wheel end EPB braking is adopted, or an electric control redundancy unit is required to be additionally added in the system. There is therefore a need for a brake-by-wire system with redundant backup braking. Prior art patent 202021482338.2 discloses a redundant design brake system with a master cylinder with reservoir assembly separated from the electronically controlled brake system; wherein the hydraulic unit of the electric control braking system is provided with two pressure generating devices; the electric control unit is provided with a double-control ECU; the wheel end electromagnetic valve in the hydraulic unit of the electric control braking system realizes backup redundancy under the control of the double-control ECU. The master cylinder module A is respectively connected with two wheels through two parallel isolation electromagnetic valves 7 and 8, the two isolation electromagnetic valves 7 and 8 are controlled by the ECU1 and the ECU2 together and are respectively connected with two cavities of the master cylinder, under the condition that the isolation electromagnetic valve 8 fails and the cavity of the master cylinder far away from the pedal cannot provide pressure, the four wheels cannot be braked through the master cylinder module, the brake device can ensure that the two wheels can be braked through the master cylinder module only on the premise that the two cavities of the master cylinder can provide pressure, and at least one of the isolation electromagnetic valves 7 and 8 cannot fail, so that the brake device is not high in effectiveness. The master cylinder module only needs to boost the pressure of two wheels to ensure the effectiveness of the system, and only one cavity is needed by the master cylinder module under the condition, and the pressure provided by one cavity is more convenient and effective, so that when the master cylinder module is only connected with the two wheels, how the two isolation electromagnetic valves can be better designed and the effectiveness of the system is ensured by the control of the ECU is very important.
Disclosure of Invention
In order to solve the problems, the invention provides a wire control brake system with redundant backup braking and a control method, wherein a cavity with a single inner cavity is arranged, the cavity is connected with an isolation electromagnetic valve I and an isolation electromagnetic valve II which are connected in series, the isolation electromagnetic valve I and the isolation electromagnetic valve II are connected with a brake loop a, the brake loop a is connected with two wheels, the isolation electromagnetic valve I and the isolation electromagnetic valve II are respectively controlled by an ECU (electronic control unit) I and an ECU II and are independently controlled, so that the effectiveness is improved by adopting the cavity with the single inner cavity, the pressure of a master cylinder module cannot reach the wheels only when two isolation electromagnetic valves fail, the effectiveness of braking is greatly improved, and the first electric control brake module and the second electric control brake module are matched for braking the wheels, so that the safety of the brake system is ensured, and the problems in the background technology are solved.
The invention aims to provide a brake-by-wire system with redundant backup braking, which comprises a master cylinder module A, an electric control hydraulic unit B and four wheels with wheel end brakes, wherein the master cylinder module A is connected with a brake pedal and is arranged on a front coaming of a vehicle, and each wheel end is provided with a liquid inlet valve and a liquid outlet valve;
the electric control hydraulic unit B comprises a first electric control braking module, a second electric control braking module, an ECU I and an ECU II, wherein the first electric control braking module is controlled by the ECU I, and the second electric control braking module is controlled by the ECU II;
the master cylinder module A is connected with two wheels through a brake loop a, and the first electric control brake module and the second electric control brake module are connected with the brake loop a and the brake loop b for pressure control;
the master cylinder module A is connected with a brake loop a through a hydraulic pipeline c, and an isolation electromagnetic valve I and an isolation electromagnetic valve II which are connected in series are arranged on the hydraulic pipeline c;
the master cylinder module A comprises a first liquid storage tank capable of containing brake fluid, a travel sensor for identifying the pedal depression degree, a cavity capable of discharging oil, and a pedal feel simulator capable of discharging the brake fluid from the cavity capable of discharging the oil to form a brake pedal feel; the cavity is a single lumen cavity.
The further improvement is that: the first electric control braking module comprises a motor, a transmission mechanism and a pressure cylinder which are connected together, wherein the pressure cylinder is respectively connected with a braking loop a and a braking loop b through two hydraulic loop outputs, and an electromagnetic valve I and an electromagnetic valve II are respectively arranged on the two hydraulic loops, the electromagnetic valve I is connected with the braking loop a, and the electromagnetic valve II is connected with the braking loop b.
The further improvement is that: the second electric control braking module comprises a motor, the motor is connected with a first pump unit and a second pump unit, an outlet of the first pump unit is hydraulically connected with a braking loop a, and an outlet of the second pump unit is hydraulically connected with a braking loop b; an outlet of the first pump unit is provided with a third electromagnetic valve, and an outlet of the second pump unit is provided with a fourth electromagnetic valve.
The further improvement is that: the first electric control braking module is provided with a fifth electromagnetic valve, the first liquid storage tank is connected with a second liquid storage tank, and the fifth electromagnetic valve is hydraulically connected with the second liquid storage tank.
The further improvement is that: the oil suction port of the first pump unit is connected with the T-shaped port of the second liquid storage tank, and the oil suction port of the second pump unit is connected with the T5-shaped port of the second liquid storage tank.
The further improvement is that: the stroke sensor for identifying the pedal depression degree contained in the master cylinder module A comprises two paths of outputs which are respectively used for a first controller ECU and a second controller ECU in the electric control hydraulic unit B.
The further improvement is that: the pedal feel simulator which can be contained in the master cylinder module A and can be used for discharging brake liquid from the containing cavity to form brake pedal feel is arranged on the hydraulic pipeline c in the electric control hydraulic unit B.
The further improvement is that: and the oil suction port loops of the first pump unit and the second pump unit are respectively provided with a solenoid valve six and a solenoid valve seven.
The further improvement is that: the first ECU and the second ECU are two independent controllers and are respectively provided with an independent power supply.
The further improvement is that: the first ECU and the second ECU are circuit boards of two independent space areas in a controller box.
The further improvement is that: the first electric control braking module is used as a braking demand system, and the second electric control braking module is used as a braking demand redundant system, and the first electric control braking module and the second electric control braking module are in redundancy backup.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: during high-strength braking, the first electric control braking module and the second electric control braking module work simultaneously under the control of the first ECU and the second ECU respectively, so that the supercharging speed of the braking system is improved.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: when an anti-lock function is triggered during emergency braking, a liquid inlet valve and a liquid outlet valve of each wheel end are used for supplying liquid through a pressure cylinder; when the liquid amount of the pressure cylinder is consumed to a certain extent, the second electric control braking module is used as a hydraulic source of an anti-lock function.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: at least one device with an electrically controlled clamping wheel is arranged on the wheel end brake of each wheel, and the device with the electrically controlled clamping wheel is matched with the second electrically controlled braking module to brake when the first electrically controlled braking module fails.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: if at least one wheel end brake is a vehicle driving wheel, the energy recovery function of the vehicle driving wheel is matched with the second electric control braking module to brake when the first electric control braking module fails.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: when the first electric control braking module and the second electric control braking module are invalid, the device with the electric control clamping wheels at the wheel ends can be used as an additional backup redundant braking system to realize braking.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: when the first electric control braking module and the second electric control braking module are invalid, braking moment generated by the energy recovery function of the vehicle can be used as an additional backup redundant braking system to realize braking.
The invention also provides a control method of the brake-by-wire system with redundant backup braking, which comprises the following steps: after all the electric control braking functions are disabled, a driver can discharge the cavity braking liquid of the master cylinder module A by stepping on a brake pedal, and hydraulic pressurizing braking is implemented for two wheel end brakes.
The invention has the beneficial effects that: 1. according to the invention, the single-cavity is arranged, the first isolation electromagnetic valve and the second isolation electromagnetic valve which are connected in series are connected, the first isolation electromagnetic valve and the second isolation electromagnetic valve are connected with the brake loop a, the brake loop a is connected with two wheels, the first isolation electromagnetic valve and the second isolation electromagnetic valve are controlled by the first ECU and the second ECU respectively and are controlled independently, so that the effectiveness is improved by adopting the single-cavity, the pressure of the master cylinder module cannot reach the wheels only when the two isolation electromagnetic valves are invalid, the effectiveness of braking is greatly improved, and the first electric control brake module and the second electric control brake module are matched for braking the wheels, so that the safety of a braking system is ensured.
2. The invention is provided with at least three electric control braking modules and an additional mechanical backup braking module: a master cylinder module; the hydraulic braking of the system comprises a first pressurizing module and a second pressurizing module, wherein the first pressurizing module and the second pressurizing module are respectively controlled by two controller ECU with high independence or two independent control circuit area circuit boards in a controller box; the system combines the electric control clamping brake of the wheel end as a third electric control brake module; the system is applied to pure electric and hybrid motor vehicles, and can also realize the acquisition of a fourth braking function module by utilizing an energy recovery function; the system retains the mechanical brake module. The modules are redundant, can work independently and can also work cooperatively, and optimal safety is realized according to specific working condition requirements.
3. The high-strength brake of the present invention is provided with a double-pressure generating device: the first pressurizing module and the second pressurizing module can work simultaneously when the high-strength brake is sporadic, so that the pressure building speed and the pressure building capacity are improved. Compared with the prior art, when the scheme faces the same requirement on the pressure build-up capability, the requirements on the physical parameters such as the power, the volume and the weight of the motor are lower.
4. The invention also has the anti-lock ABS function and redundancy backup: the first pressurizing module works together with a liquid inlet valve and a liquid outlet valve at the wheel end to realize an anti-lock ABS function; the second pressurizing module comprises a motor, a pump and a pressure regulating electromagnetic valve, and can also realize an anti-lock function; therefore, the system can realize the redundant backup of the ABS function.
5. The invention also improves the noise performance in the whole vehicle braking process: the system comprises a master cylinder module connected with a brake pedal, and is arranged on a dash panel of the vehicle; the electric control hydraulic unit with the electromagnetic valve and the supercharging device is not connected with the brake pedal, and is not required to be arranged on the front coaming. The electric control hydraulic unit does not need to be connected with the firewall of the front cabin of the whole vehicle, so that the sound or vibration generated by the action of the electromagnetic valve or the sound or vibration generated by the hydraulic pressure generated by the operation of the motor and the pump can not be transmitted into the cab through the firewall and the pedal, and the noise problem of the braking system is optimized.
6. The oil liquid in the liquid supplementing process of the anti-lock ABS function is supplied with two pressure sources: the system comprises two pressure generating devices which can alternately or simultaneously bear the pressure provided by oil supply, and an oil pressure source still exists in the fluid supplementing process with the anti-lock ABS function.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic view of the pedal feel simulator of fig. 1 disposed on the hydraulic line c.
Fig. 3 is a schematic diagram of the pump unit one and the pump unit two of fig. 1, respectively provided with a solenoid valve six and a solenoid valve seven on the oil suction port loop.
Fig. 4 is a schematic diagram of a conventional automotive braking system of the prior art.
In fig. 1-3: the hydraulic control system comprises an A-master cylinder module, a B-electric control hydraulic unit, a 1-brake pedal, a 2-liquid storage tank I, a 3-stroke sensor, a 4-cavity, a 5-pedal feel simulator, a 6-pressure sensor I, a 7-isolation solenoid valve I, an 8-isolation solenoid valve II, a 9-motor, a 10-pump unit I, an 11-pump unit II, a 12-solenoid valve III, a 13-solenoid valve IV, a 14-liquid storage tank II, a 15-motor and a transmission mechanism thereof, a 16-pressure cylinder, a 17-pressure sensor II, a 18-solenoid valve V, a 19-solenoid valve I, a 20-solenoid valve II, 21, 22, 23, 24-liquid inlet valves, 25, 26, 27, 28-liquid outlet valves, a 29-solenoid valve VI, 30-solenoid valves seven, 31, 32, 33, 34-wheels, 41-ECU I and 42-ECU II.
Detailed Description
The present invention will be further described in detail with reference to examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a brake-by-wire system with redundant backup braking, which includes a master cylinder module a mounted on a dash panel of a vehicle, an electric control hydraulic unit B, and four wheels 31, 32, 33, 34 with wheel end brakes, each of which is provided with a fluid inlet valve 21, 22, 23, 24 and a fluid outlet valve 25, 26, 27, 28, connected to a brake pedal 1. The system comprises a master cylinder module A connected with a brake pedal 1, and is arranged on a dash panel of a vehicle; the electric control hydraulic unit comprising the electromagnetic valve and the supercharging device is not connected with the brake pedal 1, and is not required to be arranged on the dash panel. The electric control hydraulic unit does not need to be connected with the firewall of the front cabin of the whole vehicle, so that the sound or vibration generated by the action of the electromagnetic valve or the sound or vibration generated by the hydraulic pressure generated by the operation of the motor and the pump can not be transmitted into the cab through the firewall and the pedal, and the noise problem of the braking system is optimized.
The electric control hydraulic unit B comprises a first electric control braking module, a second electric control braking module, an ECU (electronic control unit) I41 and an ECU II 41, wherein the first electric control braking module is controlled by the ECU I41, and the second electric control braking module is controlled by the ECU II 41; the first electric control braking module is used as a braking demand system, and the second electric control braking module is used as a braking demand redundant system, and the first electric control braking module and the second electric control braking module are in redundancy backup.
The first electric control braking module comprises a motor, a transmission mechanism 15 and a pressure cylinder 16 which are connected together, wherein the pressure cylinder 16 is respectively connected with a braking circuit a and a braking circuit b through two hydraulic circuit outputs, a first electromagnetic valve 19 and a second electromagnetic valve 20 are respectively arranged on the two hydraulic circuits, the first electromagnetic valve 19 is connected with the braking circuit a, and the second electromagnetic valve 20 is connected with the braking circuit b; the first electric control braking module is provided with a fifth electromagnetic valve 18, the first liquid storage tank 2 is connected with a second liquid storage tank 14, and the fifth electromagnetic valve 18 is hydraulically connected with the second liquid storage tank 14; the other end of the electromagnetic valve five 18 is connected with a pressure sensor two 17.
The second electric control braking module comprises a motor 9, the motor 9 is connected with a first pump unit 10 and a second pump unit 11, the outlet of the first pump unit 10 is hydraulically connected with a braking loop a, and the outlet of the second pump unit 11 is hydraulically connected with a braking loop b; an outlet of the first pump unit 10 is provided with a third electromagnetic valve 12, and an outlet of the second pump unit 11 is provided with a fourth electromagnetic valve 13; the oil suction port of the first pump unit 10 is connected with the T4 port of the second liquid storage tank 14, and the oil suction port of the second pump unit 11 is connected with the T5 port of the second liquid storage tank 14. Such two electronically controlled braking modules plus an additional mechanical backup braking module: a master cylinder module A; the hydraulic braking of the system comprises a first pressurizing module and a second pressurizing module, wherein the first pressurizing module and the second pressurizing module are respectively controlled by two controller ECUs with high independence or two independent control circuit area circuit boards in one controller box.
The first pressurizing module and the second pressurizing module can work simultaneously when the high-strength brake is sporadic, so that the pressure building speed and the pressure building capacity are improved. Compared with the prior art, when the scheme faces the same requirement on the pressure build-up capability, the requirements on the physical parameters such as the power, the volume and the weight of the motor are lower. The oil liquid in the liquid supplementing process of the ABS function is supplied with two pressure sources: the system comprises two pressure generating devices which can alternately or simultaneously bear the pressure provided by oil supply, and an oil pressure source still exists in the fluid supplementing process with the anti-lock ABS function. The first pressurizing module works together with a liquid inlet valve and a liquid outlet valve at the wheel end to realize an anti-lock ABS function; the second pressurizing module comprises a motor, a pump and a pressure regulating electromagnetic valve, and can also realize an anti-lock function; therefore, the system can realize the redundant backup of the ABS function.
The master cylinder module A is respectively connected with two wheels through a brake loop a and a brake loop b, and the first electric control brake module and the second electric control brake module are both connected with the brake loop a and the brake loop b for pressure control; the master cylinder module A is connected with a brake loop a through a hydraulic pipeline c, an isolation electromagnetic valve I7 and an isolation electromagnetic valve II 8 which are connected in series are arranged on the hydraulic pipeline c, the isolation electromagnetic valve I7 is controlled by an ECU I, and the isolation electromagnetic valve II 8 is controlled by an ECU II; the hydraulic line c is provided with a first pressure sensor 6.
The master cylinder module A comprises a first liquid storage tank 2 capable of containing brake fluid, a travel sensor 3 for identifying the pedal depression degree, a cavity 4 capable of discharging oil, and a pedal feel simulator 5 capable of discharging the brake fluid from the cavity 4 capable of discharging the oil to form a brake pedal feel; the cavity 4 is a single lumen cavity. The stroke sensor 3 for identifying the pedal depression degree contained in the master cylinder module A comprises two paths of outputs which are respectively used for a first controller ECU 41 and a second controller ECU 42 in the electric control hydraulic unit B. Thus, through the arrangement of the cavity 4 with a single inner cavity, the cavity 4 is connected with the isolation solenoid valve I7 and the isolation solenoid valve II 8 which are connected in series, the isolation solenoid valve I7 and the isolation solenoid valve II 8 are connected with the brake loop a, the brake loop a is connected with the two wheels 33 and 34, the isolation solenoid valve I7 and the isolation solenoid valve II 8 are respectively controlled by the ECU/41 and the ECU II 42 and are independently controlled, the effectiveness is improved by adopting the cavity 4 with the single inner cavity, the pressure of the master cylinder module cannot be reached by the two isolation solenoid valves connected in series under the condition that the two isolation solenoid valves fail, the effectiveness of braking is greatly improved, and the first electric control brake module and the second electric control brake module are matched for braking the wheels, so that the safety of a braking system is ensured.
The first and second ECUs 41 and 41 are two independent controllers, and are respectively provided with independent power supplies. The first and second ECUs 41, 41 are circuit boards of two independent spatial regions within one controller box.
As shown in fig. 2, a pedal feel simulator 5, which is provided in the master cylinder module a and can be accommodated in the chamber 4 to discharge brake fluid to make a brake pedal feel, is provided on the hydraulic line c in the electric control hydraulic unit B.
As shown in fig. 3, the oil suction port circuits of the first pump unit 10 and the second pump unit 11 are respectively provided with a solenoid valve six 29 and a solenoid valve seven 30.
Embodiment two this embodiment provides a control method of a brake-by-wire system with redundant backup braking: during high-strength braking, the first electric control braking module and the second electric control braking module work simultaneously under the control of the first ECU and the second ECU respectively, so that the supercharging speed of the braking system is improved.
Embodiment three this embodiment provides a control method of a brake-by-wire system with redundant backup braking: when an anti-lock function is triggered during emergency braking, a liquid inlet valve and a liquid outlet valve of each wheel end are supplied with liquid by a pressure cylinder 16; when the liquid amount of the pressure cylinder 16 is consumed to a certain extent, the second electric control brake module is used as a hydraulic source of an anti-lock function.
Fourth embodiment the present embodiment provides a control method of a brake-by-wire system with redundant backup braking: at least 2 devices with electrically controlled clamping wheels are arranged on the wheel end brake of each wheel, and the at least 2 devices with electrically controlled clamping wheels are matched with the second electrically controlled braking module to brake when the first electrically controlled braking module fails.
Fifth embodiment the present embodiment provides a control method of a brake-by-wire system with redundant backup braking: when the first electric control braking module and the second electric control braking module are invalid, the device with the electric control clamping wheels at the wheel ends can be used as an additional backup redundant braking system to realize braking.
The electric control clamping brake of the fourth and fifth combined wheel ends is used as a third electric control brake module; the system is applied to pure electric and hybrid motor vehicles.
Sixth embodiment the present embodiment provides a control method of a brake-by-wire system with redundant backup braking: if at least 2 wheel end brakes are vehicle driving wheels, when the first electric control braking module fails, the energy recovery function of the vehicle driving wheels is matched with the second electric control braking module to brake.
Embodiment seven this embodiment provides a control method of a brake-by-wire system with redundant backup braking: when the first electric control braking module and the second electric control braking module are invalid, braking moment generated by the energy recovery function of the vehicle can be used as an additional backup redundant braking system to realize braking.
The sixth and seventh embodiments can also be implemented to achieve the fourth braking function module using the energy recovery function.
Embodiment eight this embodiment provides a control method of a brake-by-wire system with redundant backup braking: after all the electric control braking functions are disabled, a driver can discharge the braking liquid in the cavity 4 of the master cylinder module A by stepping on a brake pedal, and hydraulic pressurizing braking is implemented on two wheel end brakes.
The hydraulic brake of the above embodiment comprises a first pressurizing module and a second pressurizing module, and is combined with the motor clamping brake of the wheel end to serve as a third electric control brake module, and the three electric control brake modules are added with additional mechanical backup brake modules: a master cylinder module; the system is applied to pure electric and hybrid motor vehicles, and can also realize the acquisition of a fourth braking function module by utilizing an energy recovery function; the system retains the mechanical brake module. The modules are redundant, can work independently and can also work cooperatively, and optimal safety is realized according to specific working condition requirements.

Claims (18)

1. A brake-by-wire system with redundant backup braking comprises a master cylinder module (A) which is connected with a brake pedal (1) and is arranged on a front coaming of a vehicle, an electric control hydraulic unit (B) and four wheels with wheel end brakes, wherein each wheel end is provided with a liquid inlet valve and a liquid outlet valve; the method is characterized in that:
the electric control hydraulic unit (B) comprises a first electric control braking module, a second electric control braking module, an ECU I (41) and an ECU II (41), wherein the first electric control braking module is controlled by the ECU I (41), and the second electric control braking module is controlled by the ECU II (41);
the master cylinder module (A) is connected with two wheels through a brake loop a, and the first electric control brake module and the second electric control brake module are connected with the brake loop a and the brake loop b for pressure control;
the master cylinder module (A) is connected with a brake loop a through a hydraulic pipeline c, and an isolation solenoid valve I (7) and an isolation solenoid valve II (8) which are connected in series are arranged on the hydraulic pipeline c, wherein the isolation solenoid valve I (7) is controlled by an ECU I, and the isolation solenoid valve II (8) is controlled by the ECU II;
the master cylinder module (A) comprises a first liquid storage tank (2) capable of containing brake liquid, a stroke sensor (3) for identifying the pedal depression degree, a cavity (4) capable of discharging oil liquid, and a pedal feel simulator (5) capable of discharging the brake liquid from the cavity (4) capable of discharging the oil liquid to form a brake pedal feel.
2. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: the first electric control braking module comprises a motor, a transmission mechanism (15) and a pressure cylinder (16) which are connected together, wherein the pressure cylinder (16) is respectively connected with a braking loop a and a braking loop b through two hydraulic loop outputs, a first electromagnetic valve (19) and a second electromagnetic valve (20) are respectively arranged on the two hydraulic loops, the first electromagnetic valve (19) is connected with the braking loop a, and the second electromagnetic valve (20) is connected with the braking loop b.
3. A brake-by-wire system with redundant backup braking as claimed in claim 2, wherein: the second electric control braking module comprises a motor (9), wherein the motor (9) is connected with a first pump unit (10) and a second pump unit (11), the outlet of the first pump unit (10) is hydraulically connected with a braking loop a, and the outlet of the second pump unit (11) is hydraulically connected with a braking loop b; an outlet of the first pump unit (10) is provided with a third electromagnetic valve (12), and an outlet of the second pump unit (11) is provided with a fourth electromagnetic valve (13).
4. A brake-by-wire system with redundant backup braking as claimed in claim 3, wherein: the first electric control braking module is provided with a fifth electromagnetic valve (18), the first liquid storage tank (2) is connected with a second liquid storage tank (14), and the fifth electromagnetic valve (18) is hydraulically connected with the second liquid storage tank (14).
5. The brake-by-wire system with redundant backup braking of claim 4, wherein: the oil suction port of the pump unit I (10) is connected with the T4 port of the liquid storage tank II (14), and the oil suction port of the pump unit II (11) is connected with the T5 port of the liquid storage tank II (14).
6. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: the stroke sensor (3) for identifying the pedal depression degree contained in the master cylinder module (A) comprises two paths of outputs which are respectively used for a first controller ECU (41) and a second controller ECU (42) in the electric control hydraulic unit (B).
7. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: a pedal feel simulator (5) which can be contained in the master cylinder module (A) and can be used for discharging brake liquid from the containing cavity (4) to form brake pedal feel is arranged on a hydraulic pipeline c in the electric control hydraulic unit (B).
8. A brake-by-wire system with redundant backup braking as claimed in claim 3, wherein: and the oil suction port loops of the first pump unit (10) and the second pump unit (11) are respectively provided with a solenoid valve six (29) and a solenoid valve seven (30).
9. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: the first ECU (41) and the second ECU (41) are two independent controllers, and are respectively provided with independent power supplies.
10. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: the first ECU (41) and the second ECU (41) are circuit boards of two independent space areas in one controller box.
11. A brake-by-wire system with redundant backup braking as claimed in claim 1, wherein: the first electric control braking module is used as a braking demand system, and the second electric control braking module is used as a braking demand redundant system, and the first electric control braking module and the second electric control braking module are in redundancy backup.
12. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: during high-strength braking, the first electric control braking module and the second electric control braking module work simultaneously under the control of the first ECU and the second ECU respectively, so that the supercharging speed of the braking system is improved.
13. A control method of a brake-by-wire system with redundant backup braking according to claims 2-11, characterized by: when an anti-lock function is triggered during emergency braking, a liquid inlet valve and a liquid outlet valve of each wheel end are supplied with liquid by a pressure cylinder (16); when the liquid amount of the pressure cylinder (16) is consumed to a certain extent, the second electric control braking module is used as a hydraulic source of an anti-lock function.
14. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: at least 2 devices with electrically controlled clamping wheels are arranged on the wheel end brake of each wheel, and the at least 2 devices with electrically controlled clamping wheels are matched with the second electrically controlled braking module to brake when the first electrically controlled braking module fails.
15. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: if at least 2 wheel end brakes are vehicle driving wheels, when the first electric control braking module fails, the energy recovery function of the vehicle driving wheels is matched with the second electric control braking module to brake.
16. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: when the first electric control braking module and the second electric control braking module are invalid, the device with the electric control clamping wheels at the wheel ends can be used as an additional backup redundant braking system to realize braking.
17. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: when the first electric control braking module and the second electric control braking module are invalid, braking moment generated by the energy recovery function of the vehicle can be used as an additional backup redundant braking system to realize braking.
18. A control method of a brake-by-wire system with redundant backup braking according to claims 1-11, characterized by: after all the electric control braking functions are disabled, a driver can discharge the braking liquid in the cavity (4) of the master cylinder module (A) by stepping on a brake pedal, and hydraulic pressurizing braking is implemented on two wheel end brakes.
CN202111516832.5A 2021-12-13 2021-12-13 Brake-by-wire system with redundant backup brake and control method Pending CN116279366A (en)

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Application Number Priority Date Filing Date Title
CN202111516832.5A CN116279366A (en) 2021-12-13 2021-12-13 Brake-by-wire system with redundant backup brake and control method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024093715A1 (en) * 2022-11-02 2024-05-10 芜湖伯特利电子控制***有限公司 Automobile hydraulic brake-by-wire system and control method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024093715A1 (en) * 2022-11-02 2024-05-10 芜湖伯特利电子控制***有限公司 Automobile hydraulic brake-by-wire system and control method therefor

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