A WCBS brake-by-wire system and control method thereof

Abstract

The present invention discloses a WCBS brake-by-wire system and a control method thereof, comprising an ECU module, a sensor module, an actuator module, a mechanical backup module and a fault diagnosis module, wherein the ECU module and the sensor module are connected to a redundant communication network and perform data exchange through the communication network; a main control ECU and a redundant ECU are provided in the present invention, and when the main control ECU fails, the redundant ECU can immediately take over the control task, continue to receive sensor data, calculate braking force distribution and send braking instructions; a redundant communication network with multi-channel communication is adopted, so that data transmission has multiple paths, and the stability and continuity of data exchange between the sensor module and the ECU module are ensured; the redundant actuator in the actuator can continue to perform braking operations as a backup actuator, and provides double protection for vehicle braking; in the extreme case where all electronic systems fail, the mechanical backup module can still ensure that the vehicle has basic braking ability, and improve driving safety.

Description

Technical Field

[0001] The present invention specifically relates to a WCBS brake-by-wire system and a control method thereof. Background Art

[0002] Traditional braking systems include mechanical braking systems and hydraulic braking systems. The mechanical braking system mainly transmits force to the brake pads through a lever mechanism or hydraulic transmission when the driver steps on the brake pedal, causing friction between the brake pads and the brake drum or brake disc, thereby achieving vehicle deceleration or parking. The hydraulic braking system uses the incompressible characteristics of liquids to push the brake master cylinder piston through the brake pedal, causing the brake fluid to generate pressure in the pipeline, and transmits the pressure to the brake cylinders of each wheel to push the brake pads to clamp the brake disc or brake drum to achieve braking. The former has the limitation of brake response lag, that is, the brake force distribution is difficult to control, and the latter hydraulic system has the risk of leakage. With the continuous development of automobile intelligence and automated driving technology, vehicles need to have a higher level of braking control capabilities. Therefore, the WCBS wire control brake system, as an emerging braking technology, has been widely studied and applied in recent years. The wire control brake system realizes braking operation through electronic signal transmission, replacing the mechanical or hydraulic connection components in the traditional braking system. It has the advantages of fast braking response, precise braking force distribution, and the integration of multiple functions.

[0003] WCBS is highly dependent on electronic components and electronic signal transmission. Electronic components may be affected by environmental factors such as electromagnetic interference, temperature changes, humidity, etc., causing failures. Once the electronic system fails, the braking command may not be transmitted or executed normally, leading to the serious consequence of brake failure.

[0004] Therefore, it is necessary to invent a WCBS brake-by-wire system and a control method thereof to solve the above problems. Summary of the invention

[0005] 1. Purpose of the invention The object of the present invention is to provide a WCBS brake-by-wire system and a control method thereof to solve the above-mentioned deficiencies in the technology.

[0006] (II) Technical solution In order to achieve the above object, the present invention provides the following technical solutions: a WCBS brake-by-wire system, comprising an ECU module, a sensor module, an actuator module, a mechanical backup module and a fault diagnosis module, wherein the ECU module and the sensor module are both connected to a redundant communication network and perform data exchange through the communication network; The ECU module is provided with control logic and communication interface; The sensor module is connected to the communication interface of the ECU module; The actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the ECU module are all connected to the actuator module; The mechanical backup module includes a mechanical connection mechanism and a manual switching device, and the mechanical connection mechanism is connected to the brake actuator; The fault diagnosis module includes a monitoring sensor and a fault warning system. The monitoring sensor is connected to various parts of the system, and the fault warning system sends an alarm signal to the outside.

[0007] Preferably, the ECU module includes a main control ECU and a redundant ECU, and both the main control ECU and the redundant ECU have control logic and a communication interface.

[0008] Preferably, the sensor module includes a wheel speed sensor and a pressure sensor, and the wheel speed sensor and the pressure sensor are respectively connected to the communication interfaces of the main control ECU and the redundant ECU.

[0009] Preferably, the actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the main control ECU and the redundant ECU are connected to the brake actuator and the redundant actuator respectively.

[0010] Preferably, the main control ECU is a core control unit that receives sensor data, calculates braking force distribution, and sends braking instructions.

[0011] Preferably, the redundant ECU takes over the control task when the main control ECU fails.

[0012] Preferably, the wheel speed sensor and the pressure sensor both provide real-time data to the ECU module.

[0013] Preferably, the redundant communication network adopts multi-channel communication.

[0014] A control method for a WCBS brake-by-wire system comprises the following steps under normal conditions: S1, sensor module data acquisition: wheel speed sensor and pressure sensor collect vehicle wheel speed information and brake system pressure information in real time; S2. Data transmission to ECU module: The data collected by the sensor is transmitted to the ECU module through a multi-channel communication redundant communication network, and connected to the communication interface of the main control ECU and the redundant ECU; S3, Braking force calculation: The main control ECU, as the core control unit, receives real-time data from the sensor module and calculates the braking force distribution required for each wheel according to the preset control algorithm and the current running status of the vehicle; S4. Sending and executing braking commands: The main control ECU sends the calculated braking commands to the brake actuator in the actuator module through its control logic, and the brake actuator performs braking operations on the vehicle according to the commands.

[0015] A control method for a WCBS brake-by-wire system comprises the following steps in a fault state: S1. Fault monitoring: The monitoring sensors in the fault diagnosis module are connected in real time to monitor the working status of each part of the system; S2. Fault diagnosis: When a certain part is detected to be abnormal, the fault diagnosis module determines the fault type and location according to the preset fault judgment logic: S3. Fault handling and takeover: S31, when the main control ECU fails: the redundant ECU immediately takes over the control task; the redundant ECU receives the data from the sensor module and calculates the braking force distribution according to the preset control algorithm; the redundant ECU sends a braking command to the actuator module through its control logic; S32, when the actuator module fails: the operator starts the mechanical backup module through the manual switching device, and the mechanical connection mechanism in the mechanical backup module directly controls the brake actuator to achieve vehicle braking; S4. Fault warning: After the fault diagnosis module detects a system fault, the fault warning system sends an alarm signal to the outside to alert the driver or relevant personnel.

[0016] Compared with the prior art, the above technical solution of the present invention has the following beneficial effects: 1. The system of the present invention is provided with a main control ECU and a redundant ECU. When the main control ECU fails, the redundant ECU can immediately take over the control task, continue to receive sensor data, calculate the braking force distribution and send braking instructions, to ensure that the vehicle braking function is not affected, effectively avoid the risk of braking system failure due to a single ECU failure, and greatly improve the reliability and safety of the system; 2. The redundant communication network with multi-channel communication is adopted in the present invention, so that data transmission has multiple paths. Even if one of the channels fails, data can still be transmitted through other channels, thus ensuring the stability and continuity of data interaction between the sensor module and the ECU module, and further enhancing the reliability of the system; 3. The actuator module of the present invention includes a brake actuator and a redundant actuator. When the brake actuator fails, the redundant actuator can continue to perform the braking operation as a backup actuator, providing double protection for vehicle braking; 4. The present invention is equipped with a mechanical backup module. When the actuator module fails, the operator can start the module through the manual switching device and use the mechanical connection mechanism to directly control the brake actuator to achieve vehicle braking. This mechanical backup method can still ensure that the vehicle has basic braking capabilities in the extreme case of complete failure of the electronic system, greatly improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall system structure of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] The present invention provides Figure 1 A WCBS brake-by-wire system shown includes an ECU module, a sensor module, an actuator module, a mechanical backup module, and a fault diagnosis module. The ECU module and the sensor module are connected to a redundant communication network and perform data exchange through the communication network. In the present invention, a redundant communication network using multi-channel communication is constructed, and the ECU module and the sensor module are connected to the network, ensuring that each channel is independent of each other and has stability and reliability of data transmission.

[0021] Specifically, the ECU module is provided with control logic and communication interface; Specifically, the sensor module is connected to the communication interface of the ECU module; Specifically, the actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the ECU module are all connected to the actuator module; Specifically, the mechanical backup module includes a mechanical connection mechanism and a manual switching device, and the mechanical connection mechanism is connected to the brake actuator; In the present invention, a mechanical connection mechanism is installed to establish a reliable mechanical connection with the brake actuator, ensuring that the brake actuator can be directly controlled mechanically when needed. A manual switching device is installed in the vehicle cockpit or in an easily accessible position so that the operator can easily start the mechanical backup module in an emergency.

[0022] Specifically, the fault diagnosis module includes a monitoring sensor and a fault warning system. The monitoring sensor is connected to various parts in the system, and the fault warning system sends an alarm signal to the outside.

[0023] In the present invention, monitoring sensors are installed at various key parts of the system, including ECU modules, sensor modules, actuator modules, etc., to monitor the working status of each part in real time. A fault warning system is configured, connected to the monitoring sensor, and ensured that the fault warning system can send an alarm signal to the outside (such as the vehicle dashboard, driver prompt sound, etc.).

[0024] Specifically, the ECU module includes a main control ECU and a redundant ECU, and both the main control ECU and the redundant ECU have control logic and communication interfaces.

[0025] In the present invention, the main control ECU and the redundant ECU are installed in appropriate positions of the vehicle to ensure that they are in a stable working environment and are not affected by adverse factors such as vibration and high temperature. Independent control logic and communication interfaces are configured for the main control ECU and the redundant ECU respectively, so that they have independent data processing and communication capabilities.

[0026] Specifically, the sensor module includes a wheel speed sensor and a pressure sensor, and the wheel speed sensor and the pressure sensor are respectively connected to the communication interfaces of the main control ECU and the redundant ECU.

[0027] In the present invention, a wheel speed sensor is installed at each wheel of the vehicle to ensure that the sensor can accurately measure the rotation speed of the wheel. At the same time, a pressure sensor is installed at a key part of the braking system to monitor the pressure change of the braking system. The output lines of the wheel speed sensor and the pressure sensor are respectively connected to the communication interface of the main control ECU and the redundant ECU to realize data transmission between the sensor and the ECU module.

[0028] Specifically, the actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the main control ECU and the redundant ECU are connected to the brake actuator and the redundant actuator respectively.

[0029] In the present invention, a brake actuator and a redundant actuator are installed in the brake system of the vehicle to ensure that they can accurately perform the braking operation according to the instruction. The control logic lead-out lines of the main control ECU and the redundant ECU are connected to the brake actuator and the redundant actuator respectively, so that the ECU module can control the actuator module.

[0030] Specifically, the main control ECU is the core control unit that receives sensor data, calculates braking force distribution, and sends braking instructions.

[0031] Specifically, the redundant ECU takes over the control task when the main control ECU fails.

[0032] Specifically, the wheel speed sensor and the pressure sensor both provide real-time data to the ECU module.

[0033] Specifically, the redundant communication network adopts multi-channel communication.

[0034] A control method for a WCBS brake-by-wire system comprises the following steps under normal conditions: S1, sensor module data acquisition: wheel speed sensor and pressure sensor collect vehicle wheel speed information and brake system pressure information in real time; Wheel speed sensor data collection: The wheel speed sensor is installed near each wheel of the vehicle, and monitors the rotation speed of the wheel in real time through electromagnetic induction, Hall effect or other applicable principles. Specifically, when the wheel rotates, the sensor senses the passing frequency of specific marks on the wheel (such as the ring gear) and converts it into an electrical signal. In order to ensure the accuracy and reliability of the data, the wheel speed sensor will collect data at a higher sampling frequency, such as thousands of times per second, so as to capture small changes in wheel speed. The collected wheel speed information includes not only the instantaneous speed of the wheel, but also related data such as the change trend of the speed, which will provide an important basis for the subsequent calculation of the braking force. Pressure sensor data acquisition: Pressure sensors are distributed in key positions of the braking system, such as brake lines, brake cylinders, etc., and are used to monitor the pressure changes inside the braking system in real time. The pressure sensor uses a high-precision pressure-sensitive element that can convert the pressure signal into an electrical signal output. During vehicle braking, when the driver steps on the brake pedal, the pressure in the braking system will change. The pressure sensor can accurately measure this pressure change and convert it into a corresponding electrical signal. The pressure sensor also monitors the static pressure of the braking system to ensure that the pressure of the braking system is within the normal range when not in the braking state, thereby ensuring the safety and reliability of the braking system.

[0035] S2. Data transmission to ECU module: The data collected by the sensor is transmitted to the ECU module through a multi-channel communication redundant communication network, and connected to the communication interface of the main control ECU and the redundant ECU; The principle is as follows: the multi-channel communication redundant communication network adopts advanced communication technology to transmit data through multiple independent communication channels, which can be wired communication channels or wireless communication channels; each communication channel has independent data transmission capabilities, and redundant coding and verification mechanisms are used in the data transmission process to ensure the accuracy and integrity of the data; when one of the communication channels fails, the other channels can continue to work normally, thereby ensuring the reliability of data transmission; Data transmission process: The data collected by the wheel speed sensor and pressure sensor first undergo preprocessing steps such as signal conditioning and analog-to-digital conversion to convert the analog signal into a digital signal, and perform preliminary filtering and calibration on the data to improve the data quality; the preprocessed data is transmitted to the communication interfaces of the main control ECU and redundant ECU respectively through a multi-channel communication redundant communication network; during the transmission process, the data will be encapsulated into a specific data packet format, and the corresponding identification and verification information will be added so that the ECU module can correctly identify and process the data; after the communication interface of the main control ECU and the redundant ECU receives the data packet, it will unpack and verify the data packet to ensure the correctness and integrity of the data; if the data packet is found to be erroneous or lost, the communication interface will process it according to the preset error correction mechanism, such as requesting retransmission or performing data interpolation.

[0036] S3, Braking force calculation: The main control ECU, as the core control unit, receives real-time data from the sensor module and calculates the braking force distribution required for each wheel according to the preset control algorithm and the current running status of the vehicle; Contents of the preset control algorithm: The preset control algorithm is formulated based on the principles of vehicle dynamics and the characteristics of the braking system; the algorithm comprehensively considers multiple factors such as the vehicle's mass, center of gravity distribution, vehicle speed, acceleration, wheel speed, and brake system pressure; the algorithm will calculate the actual driving state of the vehicle based on the vehicle's current speed and acceleration, and determine whether the vehicle is accelerating, decelerating, or driving at a constant speed; then, combined with the wheel speed information, the movement state of each wheel is analyzed to determine whether there is wheel slippage or locking; based on the pressure information of the braking system and the actual driving state of the vehicle, the algorithm will calculate the required braking force distribution of each wheel through a complex mathematical model; during the calculation process, the algorithm will take into account factors such as the vehicle's center of gravity transfer, the distribution ratio of the braking force, and the response characteristics of the braking system to ensure that the distribution of the braking force can meet the vehicle's braking needs while ensuring the vehicle's stability and controllability; Calculation process combined with the current running state of the vehicle: the main control ECU will obtain other running state information of the vehicle in real time, such as steering angle, yaw rate, etc., which will further affect the calculation result of the braking force; when the vehicle is turning, due to the centrifugal force, the center of gravity of the vehicle will shift, the load on the outer wheels will increase, and the load on the inner wheels will decrease; the main control ECU will calculate the centrifugal force and center of gravity shift of the vehicle according to the steering angle and vehicle speed, and adjust the braking force distribution of each wheel accordingly; appropriately increase the braking force of the outer wheels and reduce the braking force of the inner wheels to ensure the stability of the vehicle during the turn; in the case of emergency braking, the main control ECU will determine whether the vehicle is in a critical state of locking according to the changes in vehicle speed and acceleration; if a wheel is found to have a tendency to lock, the main control ECU will adjust the braking force of the wheel through the control algorithm to keep it in the best braking state to avoid wheel locking and causing the vehicle to lose control; S4, sending and executing the braking command: the main control ECU sends the calculated braking command to the brake actuator in the actuator module through its control logic, and the brake actuator performs a braking operation on the vehicle according to the command; Generation and sending of braking instructions: The main control ECU generates specific braking instructions based on the braking force calculation results; the braking instructions contain information such as the braking force required for each wheel, braking time, and braking method; the main control ECU sends the braking instructions in the form of digital signals to the brake actuator in the actuator module through its control logic; during the sending process, the braking instructions will be encoded and modulated to meet the transmission requirements of the communication network; The execution process of the brake actuator: After receiving the braking command, the brake actuator will decode and parse the command to obtain the specific information in the command; the brake actuator will control the pressure of the brake cylinder, adjust the gap between the brake pad and the brake disc, etc. to achieve the braking operation of the vehicle according to the command requirements; when the command requires to increase the braking force of a certain wheel, the brake actuator will increase the pressure of the brake cylinder to make the brake pad fit the brake disc more closely, thereby generating greater friction and achieving vehicle deceleration; during the braking process, the brake actuator will also feedback its working status information to the main control ECU in real time, so that the main control ECU can adjust and optimize the braking command according to the actual situation to ensure the accuracy and stability of the braking effect.

[0037] A control method for a WCBS brake-by-wire system comprises the following steps in a fault state: S1. Fault monitoring: The monitoring sensors in the fault diagnosis module are connected in real time to monitor the working status of each part of the system; Working mode of monitoring sensors: The monitoring sensors in the fault diagnosis module are distributed in various key parts of the system, including ECU modules, sensor modules, actuator modules and communication networks; a variety of monitoring technologies are used, such as voltage monitoring, current monitoring, temperature monitoring, signal transmission monitoring, etc., to monitor the working status of each part in real time; by monitoring the power supply voltage and working current of the ECU module, it is determined whether the ECU module is working normally; by monitoring the amplitude and frequency of the output signal of the sensor module, it is determined whether the sensor is faulty; by monitoring the working temperature and operating status of the actuator module, it is determined whether the actuator is operating normally; the monitoring sensor will collect data and monitor the status at certain time intervals, and transmit the monitoring results to the fault diagnosis module in real time.

[0038] S2. Fault diagnosis: When a certain part is detected to be abnormal, the fault diagnosis module determines the fault type and location according to the preset fault judgment logic: Contents of preset fault judgment logic: The preset fault judgment logic is formulated based on the normal working parameters and performance indicators of each part of the system; the logic contains a variety of fault judgment rules and conditions for identifying different types of faults; for the ECU module, if it is monitored that its power supply voltage is lower than the normal working range, or the working current increases or decreases abnormally, and the duration exceeds a certain threshold, the ECU module is judged to be faulty; for the sensor module, if the amplitude of the sensor output signal exceeds the normal range, or the signal frequency does not match the actual situation, and it still cannot return to normal after multiple verifications, the sensor is judged to be faulty; for the actuator module, if it is monitored that its working temperature is too high, or the actuator's response time exceeds the normal range, and the braking operation cannot be completed normally, the actuator is judged to be faulty; Method for determining the fault type and location: The fault diagnosis module analyzes and judges according to the preset fault judgment logic based on the monitoring results transmitted by the monitoring sensor; when an abnormality is detected in a certain part, the fault diagnosis module will first analyze and process the abnormal data to eliminate possible interference factors and misjudgments; then, the type and location of the fault are determined according to the rules and conditions in the fault judgment logic; if the output signal of a wheel speed sensor is detected to be abnormal, the fault diagnosis module will further analyze the working status, connection circuit and related electrical parameters of the sensor to determine whether the fault is caused by a sensor fault, a connection circuit fault or other factors.

[0039] S3. Fault handling and takeover: S31, when the main control ECU fails: the redundant ECU immediately takes over the control task; the redundant ECU receives the data from the sensor module and calculates the braking force distribution according to the preset control algorithm; the redundant ECU sends a braking command to the actuator module through its control logic; Redundant ECU takeover process: When the fault diagnosis module determines that the main control ECU has a fault, it will immediately send a takeover instruction to the redundant ECU; after receiving the takeover instruction, the redundant ECU will quickly start its control logic and related programs to prepare to take over the control task; the redundant ECU will first self-check its own working status to ensure that it can work normally; then, the redundant ECU will communicate with the sensor module and the actuator module to establish a new control link; Data reception and braking force calculation: The redundant ECU receives data from the sensor module through the communication interface, including wheel speed information and brake system pressure information, etc. The redundant ECU uses the same preset control algorithm as the main control ECU to calculate the braking force distribution required for each wheel based on the received real-time data and the current operating status of the vehicle. During the calculation process, the redundant ECU will fully consider the dynamic changes and uncertainties of the system, and make appropriate corrections and optimizations to the calculation results to ensure that the distribution of braking force can meet the braking needs of the vehicle. Braking command transmission: The redundant ECU transmits the calculated braking command to the brake actuator in the actuator module through its control logic; during the transmission process, the redundant ECU encodes and encrypts the braking command to ensure the safety and reliability of the command; S32, when the actuator module fails: the operator starts the mechanical backup module through the manual switching device, and the mechanical connection mechanism in the mechanical backup module directly controls the brake actuator to achieve vehicle braking; Operation method of the manual switching device: When the actuator module fails, the driver or relevant personnel can start the mechanical backup module through the manual switching device; the manual switching device is usually located in the vehicle cockpit, in an easily accessible position, such as under the instrument panel or next to the seat; the operator only needs to press or toggle the corresponding button or switch on the manual switching device to start the mechanical backup module; the manual switching device will send a start signal to the mechanical backup module and transfer the control of the system from the electronic control system to the mechanical backup module; Working principle of mechanical backup module: The mechanical connection mechanism in the mechanical backup module is directly connected to the brake actuator; when the mechanical backup module receives the start signal, the mechanical connection mechanism will directly control the brake actuator to perform braking operation through mechanical transmission; the mechanical connection mechanism usually uses mechanical transmission elements such as levers, gears, chains, etc. to transmit the operator's manual operation force to the brake actuator to achieve vehicle braking; when the operator starts the mechanical backup module through the manual switching device, he can pull or push the joystick on the mechanical connection mechanism to make the brake actuator produce braking action, thereby achieving vehicle deceleration or parking; S4, Fault warning: After the fault diagnosis module detects a system fault, the fault warning system sends an alarm signal to the outside to alert the driver or relevant personnel; Working principle of fault warning system: The fault warning system is controlled by the fault diagnosis module. When the fault diagnosis module detects a fault in the system, it will send fault information to the fault warning system. After receiving the fault information, the fault warning system will select the appropriate warning method to send an alarm signal to the outside according to the type and severity of the fault. Types of alarm signals and prompts: There are two types of alarm signals, visual alarms and auditory alarms. Visual alarms alert the driver or relevant personnel by flashing the fault indicator light on the vehicle dashboard and displaying fault information on the display screen; auditory alarms alert the driver by sounding buzzers and voice prompts. Different types of faults will correspond to different alarm prompts. For minor faults, the fault indicator light may flash at a slower frequency, accompanied by a short buzzing sound; for serious faults, the fault indicator light will flash quickly, the buzzer will continue to sound, and detailed fault information and response measures will be displayed on the display screen so that the driver or relevant personnel can take appropriate measures to deal with it in time.

[0040] In the present invention, through the redundant design of ECU modules and actuator modules and the application of redundant communication networks, the system can continue to work normally when some components fail, greatly improving the reliability of the system. Even if key components such as the main control ECU or the brake actuator fail, the redundant ECU or redundant actuator can take over the task in time to avoid failure of the brake system and ensure driving safety.

[0041] Furthermore, the setting of the mechanical backup module provides the system with an emergency braking method when the electronic control system fails completely. The operator can start the mechanical backup module through the manual switching device and use the mechanical connection mechanism to achieve vehicle braking, ensuring that the vehicle can still brake safely in extreme situations, further enhancing the safety of the system.

[0042] Furthermore, the sensor module can collect information such as the vehicle's wheel speed and brake system pressure in real time, and quickly transmit it to the ECU module through a redundant communication network. The main control ECU calculates the braking force distribution based on these real-time data and the vehicle's current operating status, making the braking command more accurate. The brake actuator can perform precise braking operations on the vehicle according to the command, improving the control accuracy and response speed of the braking system.

[0043] In the present invention, the fault diagnosis module can monitor the working status of each part of the system in real time. Once an abnormality is found, the fault type and location can be quickly determined according to the preset fault judgment logic, which helps maintenance personnel to quickly and accurately troubleshoot and repair the fault and reduce the downtime of the vehicle due to faults.

[0044] Furthermore, after detecting a system failure, the fault warning system can promptly send an alarm signal to the driver or relevant personnel to remind them to pay attention to the vehicle's brake system status. The driver can adopt corresponding driving strategies based on the alarm information to avoid safety accidents caused by brake system failure.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A WCBS brake-by-wire system, characterized in that: It includes an ECU module, a sensor module, an actuator module, a mechanical backup module and a fault diagnosis module, wherein the ECU module and the sensor module are connected to a redundant communication network and perform data exchange through the communication network; The ECU module is provided with control logic and communication interface; The sensor module is connected to the communication interface of the ECU module; The actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the ECU module are all connected to the actuator module; The mechanical backup module includes a mechanical connection mechanism and a manual switching device, and the mechanical connection mechanism is connected to the brake actuator; The fault diagnosis module includes a monitoring sensor and a fault warning system. The monitoring sensor is connected to various parts of the system, and the fault warning system sends an alarm signal to the outside.

2. A WCBS brake-by-wire system according to claim 1, characterized in that: The ECU module includes a main control ECU and a redundant ECU, and both the main control ECU and the redundant ECU have control logic and a communication interface.

3. A WCBS brake-by-wire system according to claim 2, characterized in that: The sensor module includes a wheel speed sensor and a pressure sensor, and the wheel speed sensor and the pressure sensor are respectively connected to the communication interfaces of the main control ECU and the redundant ECU.

4. A WCBS brake-by-wire system according to claim 2, characterized in that: The actuator module includes a brake actuator and a redundant actuator, and the control logic leads of the main control ECU and the redundant ECU are connected to the brake actuator and the redundant actuator respectively.

5. A WCBS brake-by-wire system according to claim 2, characterized in that: The main control ECU is the core control unit that receives sensor data, calculates braking force distribution, and sends braking instructions.

6. A WCBS brake-by-wire system according to claim 2, characterized in that: The redundant ECU takes over the control task when the main control ECU fails.

7. A WCBS brake-by-wire system according to claim 3, characterized in that: The wheel speed sensor and the pressure sensor both provide real-time data for the ECU module.

8. The WCBS brake-by-wire system according to claim 1, characterized in that: The redundant communication network adopts multi-channel communication.

9. A control method for a WCBS brake-by-wire system according to any one of claims 1 to 8, characterized in that: The normal state includes the following steps: S1, sensor module data acquisition: wheel speed sensor and pressure sensor collect vehicle wheel speed information and brake system pressure information in real time; S2. Data transmission to ECU module: The data collected by the sensor is transmitted to the ECU module through a multi-channel communication redundant communication network, and connected to the communication interface of the main control ECU and the redundant ECU; S3, Braking force calculation: The main control ECU, as the core control unit, receives real-time data from the sensor module and calculates the braking force distribution required for each wheel according to the preset control algorithm and the current running status of the vehicle; S4. Sending and executing braking commands: The main control ECU sends the calculated braking commands to the brake actuator in the actuator module through its control logic, and the brake actuator performs braking operations on the vehicle according to the commands.

10. The control method of a WCBS brake-by-wire system according to claim 9, characterized in that: The following steps are included in the fault state: S1. Fault monitoring: The monitoring sensors in the fault diagnosis module are connected in real time to monitor the working status of each part of the system; S2. Fault diagnosis: When a certain part is detected to be abnormal, the fault diagnosis module determines the fault type and location according to the preset fault judgment logic: S3. Fault handling and takeover: S31, when the main control ECU fails: the redundant ECU immediately takes over the control task; the redundant ECU receives the data from the sensor module and calculates the braking force distribution according to the preset control algorithm; the redundant ECU sends a braking command to the actuator module through its control logic; S32, when the actuator module fails: the operator starts the mechanical backup module through the manual switching device, and the mechanical connection mechanism in the mechanical backup module directly controls the brake actuator to achieve vehicle braking; S4. Fault warning: After the fault diagnosis module detects a system fault, the fault warning system sends an alarm signal to the outside to alert the driver or relevant personnel.

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