A vehicle anti-theft system based on a brake-by-wire system and a vehicle anti-theft control method

Abstract

The present application belongs to the technical field of vehicle anti-theft control, and particularly relates to a whole vehicle anti-theft system based on a brake-by-wire system and a whole vehicle anti-theft control method. The whole vehicle anti-theft system comprises an electronic anti-theft controller and a brake-by-wire system, and the brake-by-wire system comprises a brake domain controller, a brake actuator and a brake-by-wire pedal. The electronic anti-theft controller is used for generating a dynamic seed key and an anti-theft key according to the request of the brake domain controller, and performing data exchange with the brake domain controller. The brake domain controller is used for monitoring vehicle state signals in real time, performing key comparison, and issuing an instruction for executing a preset anti-theft measure; the brake actuator is used for executing a brake operation, locking or unlocking a wheel. The brake-by-wire pedal is used for detecting the operation intention of a driver, and locking or unlocking the pedal according to the instruction of the brake domain controller. The present application further proposes a whole vehicle anti-theft system. The scheme of the present application can improve the vehicle anti-theft performance without additional hardware investment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle anti-theft control, and particularly relates to a vehicle anti-theft system based on a brake-by-wire system and a vehicle anti-theft control method. BACKGROUND

[0002] With the development of the automobile industry, vehicle safety issues are increasingly valued. In order to prevent vehicle theft, existing vehicles are usually equipped with a vehicle anti-theft system, such as the one shown in FIG. 1, which mainly includes a remote controller, an electronic anti-theft controller, an alarm device, and an actuator. The remote controller is generally integrated in the car key and is used to send a vehicle unlocking request. The electronic anti-theft controller receives the unlocking request sent by the remote controller and performs key verification. If the key verification is passed, an instruction is sent to the actuator to unlock; if the key verification is not passed, the alarm device may be triggered. The actuator mainly includes a steering wheel lock and a clutch lock, which perform locking or unlocking operations after receiving the instruction of the electronic anti-theft controller. Figure 1

[0003] However, the existing anti-theft system has some deficiencies. If the driver does not start the parking function (EPB) before leaving the vehicle, the hydraulic brake system will not actively brake the vehicle, resulting in the risk of being stolen. In addition, the existing anti-theft system mainly acts on the steering wheel lock and the clutch lock, and has low reliability. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a vehicle anti-theft system based on a brake-by-wire system and a vehicle anti-theft control method.

[0005] The first aspect of the present application is to provide a vehicle anti-theft system based on a brake-by-wire system, which comprises an electronic anti-theft controller and a brake-by-wire system, wherein the brake-by-wire system comprises a brake domain controller, a brake actuator, and a brake-by-wire pedal.

[0006] The electronic anti-theft controller is configured to generate a dynamic seed key and an anti-theft key according to the request of the brake domain controller, and to exchange data with the brake domain controller.

[0007] The brake domain controller is configured to monitor vehicle state signals in real time, to generate an expected key based on the seed key from the electronic anti-theft controller, to perform key comparison with the electronic anti-theft controller, and to issue an instruction to execute a preset anti-theft measure according to the comparison result; the preset anti-theft measure includes an anti-theft warning and wheel braking.

[0008] The brake actuator is configured to perform a braking operation according to the instruction of the brake domain controller, to lock or unlock the wheels.

[0009] ​A line control pedal for detecting the driver's operation intention and locking or unlocking the pedal according to the instruction of the brake domain controller.

[0010] As a further optimization scheme of the whole vehicle anti-theft system, the electronic anti-theft controller comprises:

[0011] A seed key generation module for dynamically generating a seed key;

[0012] An anti-theft key generation module for generating an anti-theft key based on the seed key and a preset encryption algorithm;

[0013] A first communication module for data exchange with the brake domain controller, including receiving a seed key request of the brake domain controller, and transmitting the seed key and the anti-theft key to the brake domain controller through an encrypted channel;

[0014] An alarm triggering module for receiving instructions from the brake domain controller and triggering an alarm device when the key comparison fails.

[0015] As a further optimization scheme of the whole vehicle anti-theft system, the brake domain controller comprises:

[0016] A real-time monitoring module for real-time monitoring of the unlock key request, the wheel speed sensor signal, the brake pedal signal and the inertial sensor signal; if any one or more of the unlock key request, the wheel speed sensor signal, the brake pedal signal and the inertial sensor signal is monitored, a subsequent verification mechanism is started;

[0017] A second communication module for data exchange with the electronic anti-theft controller, the brake actuator and the line control pedal;

[0018] An expected key generation module for generating an expected key based on the received seed key and a preset encryption algorithm;

[0019] A key comparison module for comparing the expected key with the anti-theft key from the electronic anti-theft controller, and triggering an anti-theft measure if the comparison fails.

[0020] As a further optimization scheme of the whole vehicle anti-theft system, the brake actuator is used to apply a brake force to lock the wheels in the anti-theft mode, preventing the vehicle from being moved illegally.

[0021] As a further optimization scheme of the whole vehicle anti-theft system, the line control pedal comprises:

[0022] A pedal force sensor module and / or a pedal stroke sensor module for detecting the driver's operation on the brake pedal and feeding back to the brake domain controller;

[0023] A locking execution module for locking or unlocking the line control pedal according to the instruction of the brake domain controller.

[0024] The second aspect of the present application is to provide a vehicle theft prevention method based on a brake-by-wire system, an electronic theft prevention controller and a brake domain controller exchange data through a preset communication mechanism; the brake domain controller monitors the unlock key request, wheel speed sensor signal, brake pedal signal, and inertial sensor signal in real time; when the brake domain controller detects any of the following conditions: unlock key request, wheel speed sensor signal changes, brake pedal force or stroke signal changes, and inertial sensor signal changes, the following steps are performed:

[0025] The brake domain controller sends a seed key request to the electronic theft prevention controller;

[0026] The electronic theft prevention controller generates a seed key and generates a theft prevention key according to a preset encryption algorithm;

[0027] The brake domain controller generates an expected key based on the seed key and the preset encryption algorithm;

[0028] The brake domain controller compares the generated expected key with the theft prevention key from the electronic theft prevention controller; if the key match is successful, the vehicle is allowed to operate normally; if the key match fails, the theft prevention measure is triggered.

[0029] As a further optimization scheme of the above-mentioned vehicle theft prevention method, the brake pedal signal is the force signal from the brake pedal force sensor or / and the stroke signal from the brake pedal stroke sensor.

[0030] As a further optimization scheme of the above-mentioned vehicle theft prevention method, the theft prevention measure includes: triggering the alarm device to alarm, controlling the brake actuator to apply brake force, and locking the brake-by-wire pedal.

[0031] As a further optimization scheme of the above-mentioned vehicle theft prevention method, triggering the alarm device includes: starting the horn and starting the flash light.

[0032] As a further optimization scheme of the above-mentioned vehicle theft prevention method, the seed key is a dynamically generated unique key; the electronic theft prevention controller and the brake domain controller generate the theft prevention key and the expected key through the same preset encryption algorithm.

[0033] Advantages

[0034] Compared with the existing mechanical and electronic brake system, the scheme of the application cooperates the brake domain controller and the electronic anti-theft controller through the preset communication mechanism, improves the reliability of the anti-theft system. When the system detects illegal operation, the brake domain controller sends instructions to the brake actuator to increase the brake clamping force and lock the drive-by-wire pedal to ensure that the vehicle is in the parking state and cannot be stolen. Through the specific sensor monitoring combination and the dynamic anti-theft key verification mechanism, the system can quickly respond when illegal operation occurs under the premise of ensuring correct response to legal operation, limit the vehicle from being illegally moved, and ensure the safety of the vehicle. Moreover, the scheme of the application makes full use of the existing brake system and sensors, and does not need to increase the hardware investment related to braking on the basis of the existing hardware, and can realize high-reliability anti-theft function without additional hardware cost. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic diagram of the architecture of the existing whole vehicle anti-theft system.

[0036] Figure 2 It is a schematic diagram of the architecture of the whole vehicle anti-theft system of the application. DETAILED DESCRIPTION

[0037] The application will be further illustrated by specific embodiments, which are exemplary and intended to illustrate the problem and explain the application, but not as a limitation.

[0038] In a first aspect, the composition of the vehicle anti-theft system based on the brake-by-wire system.

[0039] The whole vehicle anti-theft control architecture based on the drive-by-wire brake system, as shown in Figure 2 , includes an electronic anti-theft controller and a drive-by-wire brake system, wherein the drive-by-wire brake system further includes a brake domain controller, a brake actuator and a drive-by-wire pedal.

[0040] (1) Electronic anti-theft controller

[0041] The electronic anti-theft controller is a control component of the vehicle anti-theft system, responsible for receiving, processing and sending anti-theft related signals and instructions. The electronic anti-theft controller has the following functional modules:

[0042] Seed key generation module

[0043] The seed key generation module generates the basis data for encryption, i.e. the seed key. The seed key is dynamically generated to ensure uniqueness and confidentiality each time.

[0044] Anti-theft key generation module

[0045] Based on the received seed key and the preset encryption algorithm, a unique anti-theft key is generated. The anti-theft key is used for subsequent comparison to verify the legality of the current operation.

[0046] First communication module

[0047] For data exchange with the brake domain controller, receiving and sending anti-theft related signals and instructions.

[0048] Alarm triggering module

[0049] When receiving a key matching failure signal, trigger the alarm device (such as horn, flashing light, etc.) to alert illegal operation.

[0050] (2.1) Brake domain controller

[0051] The brake domain controller is the electronic control unit of the brake domain, responsible for managing and coordinating the brake-related systems in the vehicle, with strong computing and communication capabilities, capable of handling control logic and data exchange. The brake domain controller includes the following modules:

[0052] Real-time monitoring module

[0053] Real-time monitoring of unlock key requests, wheel speed sensor signals, brake pedal signals, and inertial sensor signals. Once any of the following conditions is detected: unlock key request, wheel speed sensor signal change, brake pedal force or travel signal change, or inertial sensor signal change, immediately trigger the anti-theft verification process.

[0054] Second communication module

[0055] The second communication module is used for data exchange with the electronic anti-theft controller, brake actuator, and drive-by-wire pedal, including receiving seed keys and anti-theft keys, sending execution instructions, etc.

[0056] Key generation module

[0057] Receive the seed key sent by the electronic anti-theft controller, and generate the expected key based on the received seed key and the preset encryption algorithm. The generated expected key is used for subsequent comparison with the anti-theft key generated by the electronic anti-theft controller.

[0058] Key comparison module

[0059] Compare the generated expected key with the received anti-theft key generated by the electronic anti-theft controller. If the keys are consistent, allow normal operation of the vehicle; if not, trigger anti-theft measures. Anti-theft measures include anti-theft warning, brake actuator braking, and drive-by-wire pedal control. Alert illegal operation through horn, flashing light, and other methods to attract the attention of surrounding people. Force the vehicle to brake through the brake actuator to prevent movement and prevent theft. Limit or disable pedal operation to prevent illegal operators from driving the vehicle normally.

[0060] (2.2) Brake actuator

[0061] Brake actuator is the execution component in brake-by-wire system, responsible for executing brake operation according to the instruction of brake domain controller. In addition to providing brake function in daily driving, brake actuator also ensures that the vehicle cannot move when illegally operated in anti-theft mode.

[0062] When brake domain controller sends brake instruction, brake actuator applies brake force by mechanical or hydraulic means to slow down or stop the vehicle. In anti-theft mode, brake actuator applies greater or maximum brake force to lock the wheels to prevent the vehicle from being illegally moved. When brake domain controller sends unlock instruction, brake actuator releases brake force to restore the vehicle to a movable state.

[0063] (2.3) Brake-by-wire pedal

[0064] Brake-by-wire pedal is the interface between driver and brake system, responsible for detecting driver's operation and transmitting signals. Brake-by-wire pedal has the following modules:

[0065] Pedal force sensor module and / or pedal stroke sensor module

[0066] Pedal force sensor module is used to detect the operating force of brake pedal by the driver, and convert pedal force into electrical signal, which is sent to brake domain controller, which can be used to determine the driver's operation intention. Pedal stroke sensor module is used to detect the change of pedal stroke, and convert pedal stroke into signal, which is sent to brake domain controller, which can also be used to determine the driver's operation intention.

[0067] Lock execution module

[0068] Lock execution module locks or unlocks brake-by-wire pedal according to the instruction of brake domain controller. In normal circumstances, lock execution module keeps brake-by-wire pedal in unlocked state according to the instruction, ensuring that the driver can normally operate brake-by-wire pedal to realize the driving of the vehicle. In anti-theft mode, lock brake-by-wire pedal to prevent illegal operation.

[0069] In a second aspect, the operation mechanism of the vehicle anti-theft system based on the brake-by-wire system.

[0070] Brake domain controller performs real-time monitoring tasks, and will respond immediately once it detects any of the following conditions: receiving an unlock key request, wheel speed sensor signal changes, brake pedal force or stroke signal changes, and inertia sensor signal changes.

[0071] When the driver presses the unlock button of the remote control (vehicle key) to send an unlock request, the remote control will send the unlock request to the vehicle through wireless signal (such as RF radio frequency or Bluetooth), and then the brake domain controller will detect the unlock request. This situation meets the normal unlock process, and the legality of the unlock request will be verified by the anti-theft key later.

[0072] A wheel speed sensor is installed in the vehicle to detect the rotational speed of the vehicle wheels. When the vehicle is stationary, the wheel speed sensor signal is zero; when the wheel speed sensor signal changes, it means that the vehicle is moving or trying to move. In this case, the legality of vehicle movement is also verified by the anti-theft key to prevent illegal movement.

[0073] A brake pedal force sensor detects the force exerted by the driver on the brake pedal and converts the force into an electrical signal. A travel sensor detects the displacement (travel) of the brake pedal and converts the displacement into an electrical signal. If the brake pedal force or travel signal changes, it means that the driver may be trying to brake or the vehicle is being operated illegally. In this case, the legality of the operation is also verified by the anti-theft key.

[0074] Inertial sensors (such as acceleration sensors, gyroscopes) are usually installed in the center of the vehicle body or on the chassis to detect the acceleration, tilt angle, and other dynamic parameters of the vehicle and convert them into corresponding signals. If the inertial sensor signal changes, it means that the vehicle may be experiencing abnormal motion (such as being towed away or being hit). In this case, the legality of the vehicle's action is also verified by the anti-theft key to prevent illegal operation.

[0075] When the brake domain controller detects any of the following conditions: receiving an unlock key request, a change in the wheel speed sensor signal, a change in the brake pedal force or travel signal, or a change in the inertial sensor signal, the brake domain controller responds to the following workflow:

[0076] (S1) The brake domain controller sends a seed key request:

[0077] The brake domain controller sends a seed key request to the electronic anti-theft controller, which is used to generate an expected key later.

[0078] (S2) The electronic anti-theft controller generates a seed key and an anti-theft key:

[0079] The electronic anti-theft controller generates a seed key according to the request and generates a unique anti-theft key using a pre-set key algorithm. This anti-theft key is dynamically generated and a new key is generated each time the request is made. The electronic anti-theft controller sends the generated seed key and anti-theft key to the brake domain controller.

[0080] (S3) Key matching and response:

[0081] The brake domain controller generates an expected key according to the received seed key, and then matches the received anti-theft key with the expected key. After matching, if the two are consistent, the key matching is successful, and the system normally responds to the driver's operation request; if the two are not consistent, the key matching fails, the brake domain controller sends a request to trigger the anti-theft alarm function (such as horn, flashing light, etc.), and at the same time the brake domain controller sends an instruction to the brake actuator and takes anti-theft measures, including increasing the brake clamping force and locking the drive-by-wire pedal.

[0082] In the key matching process, the brake domain controller and the electronic anti-theft controller generate an expected key and an anti-theft key based on the same seed key and encryption algorithm, respectively, and determine the legality of the operation by comparing the consistency of the two. Since the key is generated based on the dynamically generated seed key and the preset encryption algorithm, only a legal request (such as the driver sending an unlock request through the remote control) can trigger the correct key generation process, thereby ensuring that the expected key is consistent with the actual key, the system determines that it is a legal behavior, and allows the vehicle to normally respond to the driver's operation request, including first unlocking the steering wheel lock, the clutch lock, and allowing the vehicle to start. Illegal operation (such as a thief trying to forcibly unlock or tow away the vehicle) cannot obtain a legal seed key or encryption algorithm, and the generated key is not consistent with the expected key, the system determines that it is an illegal behavior, triggers the anti-theft alarm function, and sends an instruction to the brake actuator to increase the brake clamping force, so that the vehicle cannot move, and the drive-by-wire pedal is locked to prevent it from bouncing back to the initial position, thereby effectively preventing the vehicle from being operated illegally. Through this mechanism, the system can ensure normal use of the vehicle when the key matching is successful, and take multiple anti-theft measures when the matching fails to prevent the vehicle from being forcibly moved and to ensure the safety of the vehicle.

[0083] The above embodiments are exemplary and are intended to illustrate the technical concept and characteristics of the present application, so that those skilled in the art can understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A vehicle theft prevention system based on a brake-by-wire system, characterized by, The electronic anti-theft controller and the wire control system, wherein the wire control system comprises a brake domain controller, a brake actuator and a wire control pedal; The electronic anti-theft controller is used to generate a dynamic seed key and an anti-theft key according to the request of the brake domain controller, and exchange data with the brake domain controller; The brake domain controller is used to monitor vehicle state signals in real time, generate an expected key based on the seed key from the electronic anti-theft controller, and compare the keys with the electronic anti-theft controller, and issue an instruction to execute a preset anti-theft measure according to the comparison result; the preset anti-theft measure includes anti-theft warning and wheel braking; The brake actuator is used to execute brake operation according to the instruction of the brake domain controller, and lock or unlock the wheels; The wire control pedal is used to detect the operation intention of the driver, and lock or unlock the pedal according to the instruction of the brake domain controller; The electronic anti-theft controller comprises: A seed key generation module for dynamically generating a seed key; An anti-theft key generation module for generating an anti-theft key based on the seed key and a preset encryption algorithm; A first communication module for data exchange with the brake domain controller, including receiving the seed key request of the brake domain controller, and transmitting the seed key and the anti-theft key to the brake domain controller through an encrypted channel; An alarm triggering module receives the instruction of the brake domain controller and triggers the alarm device when the key comparison fails; The brake domain controller comprises: A real-time monitoring module for real-time monitoring of unlock key request, wheel speed sensor signal, brake pedal signal and inertial sensor signal; if any one or more of the unlock key request, wheel speed sensor signal, brake pedal signal and inertial sensor signal is monitored, the subsequent verification mechanism is started; A second communication module for data exchange with the electronic anti-theft controller, the brake actuator and the wire control pedal; An expected key generation module for generating an expected key based on the received seed key and a preset encryption algorithm; A key comparison module for comparing the expected key with the anti-theft key from the electronic anti-theft controller, and triggering the anti-theft measure if the comparison fails; The wire control pedal comprises: A pedal force sensor module and / or a pedal stroke sensor module for detecting the operation of the driver on the brake pedal and feeding back to the brake domain controller; A locking execution module for locking or unlocking the wire control pedal according to the instruction of the brake domain controller; When the brake domain controller detects any one of the unlock key request, the change of the wheel speed sensor signal, the change of the brake pedal force or stroke signal, and the change of the inertial sensor signal, the brake domain controller sends a seed key request to the electronic anti-theft controller.

2. The vehicle anti-theft system as claimed in claim 1 wherein, The brake actuator is used to apply brake force to lock the wheels in anti-theft mode, preventing the vehicle from being moved illegally.

3. A vehicle theft prevention method based on a brake-by-wire system, characterized by, The whole vehicle anti-theft system according to claim 1 or 2, comprising the following steps: The electronic immobilizer controller and the brake domain controller exchange data through a preset communication mechanism; the brake domain controller monitors the unlock key request, wheel speed sensor signal, brake pedal signal, and inertial sensor signal in real time; when the brake domain controller detects any one of the following situations: the unlock key request, the wheel speed sensor signal changes, the brake pedal force or stroke signal changes, and the inertial sensor signal changes, the following steps are executed: The brake domain controller sends a seed key request to the electronic immobilizer controller; The electronic immobilizer controller generates a seed key and an anti-theft key according to a preset encryption algorithm; The brake domain controller generates an expected key based on the seed key and the preset encryption algorithm; The brake domain controller compares the generated expected key with the anti-theft key from the electronic immobilizer controller; if the key match is successful, the vehicle is allowed to operate normally; if the key match fails, an anti-theft measure is triggered.

4. The method of claim 3, wherein, The brake pedal signal is a force signal from a brake pedal force sensor or / and a stroke signal from a brake pedal stroke sensor.

5. The method of claim 3, wherein, The anti-theft measure includes triggering an alarm device to alarm, controlling a brake actuator to apply a brake force, and locking a drive-by-wire pedal.

6. The method of claim 5, wherein, Triggering the alarm device includes starting a horn and starting a flash light.

7. The method of claim 3, wherein, The seed key is a dynamically generated unique key; the electronic immobilizer controller and the brake domain controller generate the anti-theft key and the expected key through the same preset encryption algorithm.

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