Wheel speed signal processing system and vehicle

Abstract

A wheel speed signal processing system and a vehicle. The wheel speed signal processing system comprises a sensor driving circuit and calculation units (5, 6); the sensor driving circuit comprises integrated circuits (1, 2), the integrated circuits (1, 2) being connected to the calculation units (5, 6) and a wheel speed sensor (3), and at least two integrated circuits (1, 2) being provided. The wheel speed signal processing system uses a combination of the sensor driving circuit and a certain controller module in a vehicle to implement the redundant measurement of the wheel speed sensor (3) by means of certain control logic, so that the failure of a single point in any circuit will not affect the identification of a wheel speed signal, thereby improving reliability.

Description

Wheel speed signal processing system and vehicle Technical Field

[0001] This invention belongs to the field of motor vehicle safety braking control technology. Specifically, this invention relates to a wheel speed signal processing system and a vehicle. Background Technology

[0002] Wheel speed circuit processing plays a crucial role in automotive safety, especially in the braking system. Current wheel speed processing methods include single-loop, dual-loop, and dual-redundant loop processing. Single-loop processing cannot guarantee that the wheel speed signal remains valid even in the event of a single point of failure in the controller's internal circuitry. Dual-redundant loop processing, on the other hand, complicates the system and increases costs, impacting the performance and reliability of the braking safety system.

[0003] Chinese Patent Application No. 202311175677.4 discloses a wheel speed signal processing circuit, vehicle, and method. The circuit includes: a data acquisition component for acquiring current signals during wheel rotation; a processing component for converting the current signals into digital pulse signals and corresponding analog signals; and a control component connected to the processing component for generating the current wheel speed and direction based on the digital pulse signals and their corresponding analog signals. This wheel speed signal processing circuit solves the problems of current signal processing methods, such as the difficulty in designing separate analog circuits and the large number of components leading to complex layouts. It achieves quality control of wheel speed signals, reduces the number of components, lowers costs, and improves the accuracy of signal processing.

[0004] The aim is to provide an improved wheel speed signal processing system, particularly regarding how to reduce complexity and improve reliability. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a wheel speed signal processing system with the aim of improving reliability.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a wheel speed signal processing system, including a sensor driving circuit and a computing unit, wherein the sensor driving circuit includes an integrated circuit, the integrated circuit is connected to the computing unit and the wheel speed sensor, and the integrated circuit is provided with at least two channels.

[0007] At least one sensor driving circuit is provided.

[0008] The computing unit has at least one channel, and the computing unit is configured to receive the wheel speed sensor signal processed by the integrated circuit.

[0009] The integrated circuit provides voltage or current signals to the wheel speed sensor through connected wires. The integrated circuit includes a first integrated circuit and a second integrated circuit. The first integrated circuit or the second integrated circuit receives and judges the voltage or current signals fed back by the wheel speed sensor. The first integrated circuit or the second integrated circuit transmits the wheel speed sensor signals to the computing unit. The computing unit receives and identifies the voltage or current of the wheel speed sensor signals, respectively.

[0010] The wheel speed signal processing system further includes a switching circuit for controlling the sensor drive circuit, the switching circuit being controlled by at least one of the computing units through configuration.

[0011] The computing unit includes a first computing unit and a second computing unit. The first computing unit is connected to a first integrated circuit, and the second computing unit is connected to a second integrated circuit. The switching circuit is controlled by the first computing unit and the second computing unit respectively. When the first computing unit turns on the switching circuit, the current of the wheel speed sensor flows back to the first integrated circuit through the switching circuit. The first integrated circuit processes the wheel speed sensor signal and inputs it to the first computing unit.

[0012] When the switching circuit is turned off by the computing unit, the second integrated circuit drives the wheel speed sensor and receives the wheel speed sensor signal. The second integrated circuit then transmits the received wheel speed sensor signal to the second computing unit.

[0013] The first integrated circuit is connected to one end of the wheel speed sensor, and the second integrated circuit is connected to the other end of the wheel speed sensor. The signal of the wheel speed sensor is simultaneously recognized by the first integrated circuit and the second integrated circuit. By comparing the signals of the first integrated circuit and the second integrated circuit, the wheel speed sensor signal is identified and verified, and the authenticity of the wheel speed sensor signal is determined.

[0014] The first integrated circuit transmits the received wheel speed sensor signal to the first computing unit, and the second integrated circuit transmits the received wheel speed sensor signal to the second computing unit. The second computing unit sends the received wheel speed sensor signal to the first computing unit, which then determines the authenticity of the wheel speed sensor signal. Alternatively, the first computing unit sends the received wheel speed sensor signal to the second computing unit, which then determines the authenticity of the wheel speed sensor signal.

[0015] When the first computing unit or the first integrated circuit fails, the second computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the second integrated circuit.

[0016] When the second computing unit or the second integrated circuit fails, the first computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

[0017] When the switching circuit fails in short-circuit mode, the first computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

[0018] When the switching circuit is short-circuited and the first computing unit malfunctions, the second computing unit can drive the wheel speed sensor and receive the wheel speed sensor signal through the first integrated circuit.

[0019] The present invention also provides a vehicle including the aforementioned wheel speed signal processing system.

[0020] The wheel speed signal processing system of the present invention has the following beneficial effects:

[0021] 1. Low cost: By combining existing sensor circuits with a controller module in the vehicle, redundant detection of wheel speed sensors is achieved through certain control logic. A single point failure in any circuit will not affect the recognition of wheel speed signals, thus improving reliability.

[0022] 2. Simple design: The design can be implemented using the circuits within many of the vehicle's control modules. By connecting the existing circuits within the control modules according to this design, the complexity of the entire system circuit design is reduced.

[0023] 3. The design circuit for the wheel speed redundancy signal is simplified while enabling redundant control and detection of two systems, avoiding signal interference caused by complex sensor design.

[0024] 4. One wheel speed sensor chip can be saved in autonomous driving requirements. Attached Figure Description

[0025] This manual includes the following figures, which illustrate the following:

[0026] Figure 1 is a schematic diagram of the wheel speed signal processing system of the present invention;

[0027] Figure 2 is a schematic diagram of the main control logic of the wheel speed signal processing system of the present invention;

[0028] Figure 3 is a schematic diagram of the control logic of the wheel speed signal processing system of the present invention when the switching circuit is short-circuited;

[0029] The components in the diagram are labeled as follows: 1. First integrated circuit; 2. Second integrated circuit; 3. Wheel speed sensor; 4. Switching circuit; 5. First computing unit; 6. Second computing unit;

[0030] In the above figures:

[0031] Indicates a circuit loop;

[0032] Indicates a functional module. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0034] In a first aspect, as shown in Figures 1 to 3, an embodiment of the present invention provides a wheel speed signal processing system, including a sensor driving circuit and a computing unit. The sensor driving circuit includes an integrated circuit, which is connected to the computing unit and the wheel speed sensor. The integrated circuit has at least two channels.

[0035] Specifically, wheel speed sensors are used to measure the rotational speed of a car's wheels. The sensor drive circuit is responsible for driving the wheel speed sensor to accurately measure the wheel's rotational speed. Wheel speed sensors typically generate electrical signals by sensing changes in the magnetic field produced by the wheel's rotational speed. These electrical signals are then processed by the sensor drive circuit and converted into digital or analog signals suitable for subsequent processing by the control system.

[0036] Integrated circuits refer to the driving and detection circuits of wheel speed sensors built using existing electronic components, or they can be designed as integrated chips with this function.

[0037] In this embodiment of the invention, at least one sensor driving circuit is provided, and a current loop is provided between the sensor and the driving circuit. At least one computing unit is provided, and the computing unit is configured to receive the wheel speed sensor signal processed by the integrated circuit.

[0038] The sensor driving circuit consists of pre-set integrated circuits and electronic components, with at least one integrated circuit connected to the wheel speed sensor via a wire.

[0039] The current loop can be implemented through electrical connections of preset integrated circuits and electronic components. At least the second integrated circuit is connected to the wheel speed sensor through wires and the driving circuit of the integrated circuit. The second integrated circuit also has the function of driving the wheel speed sensor and receiving sensor signals. The implementation mode or circuit design in the circuit may differ. For example, the first integrated circuit is driven on the high side and the second integrated circuit is driven on the low side.

[0040] The wheel speed signal processing system provided in this invention can solve the complexity of redundant backup of multiple wheel speed sensors and the problem of overly complex redundant wheel speed drive circuits in autonomous vehicles. Through loop improvement design in the circuit design of this system, corresponding connections are made using existing circuits in the vehicle control module, and implemented through software control logic, thereby improving the performance and reliability of the entire braking safety system while saving design costs.

[0041] The wheel speed signal processing system provided in this invention can improve the driving safety of motor vehicles. When any single point in the wheel speed signal detection circuit fails, the system can improve the circuit connection relationship to provide reliable wheel speed signals for safe braking and parking braking of the vehicle.

[0042] As shown in Figures 1 to 3, the integrated circuit provides voltage or current signals to the wheel speed sensor 3 via connected wires. In this embodiment of the invention, the integrated circuit includes a first integrated circuit 1 and a second integrated circuit 2. First, the first integrated circuit 1 detects the wheel speed signal through a first circuit loop generated by a switching circuit and the wheel speed sensor 3. The first integrated circuit 1 or the second integrated circuit 2 receives and judges the voltage or current signal fed back by the wheel speed sensor 3, and then transmits the wheel speed sensor signal to the computing unit. The computing unit receives and identifies the voltage or current of the wheel speed sensor signal, respectively.

[0043] As shown in Figures 1 to 3, the wheel speed signal processing system of this embodiment of the invention further includes a switching circuit for controlling the sensor drive circuit, and the switching circuit is controlled by at least one computing unit through configuration.

[0044] In this embodiment of the invention, a switching circuit for controlling the drive loop is provided to connect the sensor drive circuit and the switching circuit in the system. Specifically, the switching circuit includes a switching switch 4, which is controlled and connected to the first computing unit 5 and the second computing unit 6 respectively. When both the first computing unit 5 and the first integrated circuit 1 are fault-free, the first computing unit 5 controls the switching circuit to enable the first integrated circuit 1 to form a detection path with the wheel speed sensor 3, and the signal detected by the first integrated circuit 1 is transmitted to the first computing unit 5.

[0045] In this embodiment of the invention, the computing unit includes a first computing unit 5 and a second computing unit 6. The first computing unit 5 is connected to a first integrated circuit 1, and the second computing unit 6 is connected to a second integrated circuit 2. The switching circuit is controlled by the first computing unit 5 and the second computing unit 6 respectively. As shown in Figure 2, under normal circumstances, the first computing unit 5 activates the switching circuit, and the current from the wheel speed sensor 3 flows back to the first integrated circuit 1 through the switching circuit. The first integrated circuit 1 processes the wheel speed sensor signal and inputs it to the first computing unit 5. When the first computing unit 5 and / or the first integrated circuit 1 fails to operate, the second computing unit 6 deactivates the switching circuit through a control circuit. Simultaneously, the second integrated circuit 2 and the wheel speed sensor 3 form a second circuit loop to detect the wheel speed signal. The signal detected by the second integrated circuit 2 is then transmitted to the second computing unit 6.

[0046] In this embodiment of the invention, when the switching circuit is turned off by the computing unit, the second integrated circuit 2 drives the wheel speed sensor 3 and receives the wheel speed sensor signal. The second integrated circuit 2 then transmits the received wheel speed sensor signal to the second computing unit 6.

[0047] In this embodiment of the invention, the first integrated circuit 1 is connected to one end of the wheel speed sensor 3, and the second integrated circuit 2 is connected to the other end of the wheel speed sensor 3. The signal of the wheel speed sensor is simultaneously recognized by the first integrated circuit 1 and the second integrated circuit 2. By comparing the signals 2 of the first integrated circuit 1 and the second integrated circuit, the wheel speed sensor signal can be identified and verified, and the authenticity of the wheel speed sensor signal can be redundantly determined.

[0048] In this embodiment of the invention, the first integrated circuit 1 transmits the received wheel speed sensor signal to the first computing unit 5, and the second integrated circuit 2 transmits the received wheel speed sensor signal to the second computing unit 6. The second computing unit 6 then sends the received wheel speed sensor signal back to the first computing unit 5, which determines the authenticity of the wheel speed sensor signal. Alternatively, the first computing unit 5 sends the received wheel speed sensor signal back to the second computing unit 6, which then determines the authenticity of the wheel speed sensor signal.

[0049] In this embodiment of the invention, when the first computing unit 5 or the first integrated circuit 1 fails, the second computing unit 6 drives the wheel speed sensor 3 and receives the wheel speed sensor signal through the second integrated circuit 2.

[0050] In this embodiment of the invention, when the second computing unit 6 or the second integrated circuit 2 fails, the first computing unit 5 drives the wheel speed sensor 3 and receives the wheel speed sensor signal through the first integrated circuit 1.

[0051] In this embodiment of the invention, when the switching circuit fails due to a short circuit, as shown in Figure 3, the on / off signals issued by the computing unit will not have any actual control effect on the switching circuit. The first integrated circuit 1 directly forms a fourth circuit loop with the wheel speed sensor 3. The first computing unit 5 drives the wheel speed sensor 3 and receives the wheel speed sensor signal through the first integrated circuit 1. When the switching circuit is short-circuited and the first computing unit 5 fails, the second computing unit 6 has redundancy. The wheel speed sensor signal collected by the first integrated circuit 1 can be transmitted to the second computing unit 6 through the third circuit loop, thereby ensuring the normal operation of the system.

[0052] Through the above operations, the signal from a single wheel speed sensor can be redundantly driven and obtained by two computing units in the system.

[0053] Secondly, the present invention also provides a vehicle including a wheel speed signal processing system with the above-described structure. The specific structure of this wheel speed signal processing system can be seen in Figures 1 to 3, and will not be repeated here. Since the vehicle of the present invention includes the wheel speed signal processing system of the above embodiments, it possesses all the advantages of the above-described wheel speed signal processing system.

[0054] Wheel speed signal processing systems can be integrated into vehicle control modules such as ONE-BOX (brake-by-wire system), iBooster (electronic brake booster), BCU (body control unit), CCU (central control unit), and ACU (airbag controller). The wheel speed signal processing system can be integrated into a single controller module or into a separate controller module, achieving dual-channel signal detection without increasing the number of wheel speed sensors.

[0055] The complete vehicle and vehicles of the present invention include, but are not limited to, passenger cars and commercial vehicles.

[0056] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A wheel speed signal processing system, characterized by: It includes a sensor driving circuit and a computing unit. The sensor driving circuit includes an integrated circuit, which is connected to the computing unit and the wheel speed sensor. The integrated circuit has at least two channels.

2. The wheel speed signal processing system of claim 1, wherein: At least one sensor driving circuit is provided.

3. The wheel speed signal processing system of claim 1, wherein: The computing unit has at least one channel, and the computing unit is configured to receive wheel speed sensor signals processed by the integrated circuit.

4. The wheel speed signal processing system according to any one of claims 1 to 3, characterized in that: The integrated circuit provides voltage or current signals to the wheel speed sensor through connected wires. The integrated circuit includes a first integrated circuit and a second integrated circuit. The first integrated circuit or the second integrated circuit receives and judges the voltage or current signals fed back by the wheel speed sensor. The first integrated circuit or the second integrated circuit transmits the wheel speed sensor signals to the computing unit. The computing unit receives and identifies the voltage or current of the wheel speed sensor signals respectively.

5. The wheel speed signal processing system according to any one of claims 1 to 3, wherein: It also includes a switching circuit for controlling the sensor driving circuit, the switching circuit being controlled by at least one of the computing units by configuration.

6. The wheel speed signal processing system of claim 5, wherein: The computing unit includes a first computing unit and a second computing unit. The first computing unit is connected to the first integrated circuit, and the second computing unit is connected to the second integrated circuit. The switching circuit is controlled by the first computing unit and the second computing unit respectively. When the first computing unit turns on the switching circuit, the current of the wheel speed sensor flows back to the first integrated circuit through the switching circuit. The first integrated circuit processes the wheel speed sensor signal and inputs it to the first computing unit.

7. The wheel speed signal processing system of claim 6, wherein: When the switching circuit is turned off by the computing unit, the second integrated circuit drives the wheel speed sensor and receives the wheel speed sensor signal. The second integrated circuit then transmits the received wheel speed sensor signal to the second computing unit.

8. The wheel speed signal processing system of claim 6, wherein: The first integrated circuit is connected to one end of the wheel speed sensor, and the second integrated circuit is connected to the other end of the wheel speed sensor. The signal of the wheel speed sensor is simultaneously recognized by the first integrated circuit and the second integrated circuit. By comparing the signals of the first integrated circuit and the second integrated circuit, the wheel speed sensor signal is identified and verified, and the authenticity of the wheel speed sensor signal is determined.

9. The wheel speed signal processing system of claim 8, wherein: The first integrated circuit transmits the received wheel speed sensor signal to the first computing unit, the second integrated circuit transmits the received wheel speed sensor signal to the second computing unit, and the second computing unit sends the received wheel speed sensor signal back to the first computing unit, which then determines the authenticity of the wheel speed sensor signal; or, the first computing unit sends the received wheel speed sensor signal back to the second computing unit, which then determines the authenticity of the wheel speed sensor signal.

10. A wheel speed signal processing system according to any one of claims 5 to 9, characterised in that: When the first computing unit or the first integrated circuit fails, the second computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the second integrated circuit.

11. A wheel speed signal processing system according to any one of claims 5 to 9, characterised in that: When the second computing unit or the second integrated circuit fails, the first computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

12. A wheel speed signal processing system according to any one of claims 5 to 9, characterised in that: When the switching circuit fails in short-circuit mode, the first computing unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

13. The wheel speed signal processing system according to any one of claims 5 to 9, wherein: When the switching circuit is short-circuited and the first computing unit malfunctions, the second computing unit can drive the wheel speed sensor and receive the wheel speed sensor signal through the first integrated circuit.

14. A vehicle characterized by: Includes the wheel speed signal processing system as described in any one of claims 1 to 13.

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