Wheel speed signal processing system and vehicle

Abstract

The invention discloses a wheel speed signal processing system which comprises a sensor driving circuit and a computing unit, the sensor driving circuit comprises at least two integrated circuits, and the integrated circuits are connected with the computing unit and a wheel speed sensor. According to the wheel speed signal processing system, the sensor circuit is combined with a certain controller module in the vehicle, redundancy detection of the wheel speed sensor is achieved through certain control logic, recognition of the wheel speed signal is not affected by single-point failure in any circuit, and reliability can be improved. The invention further discloses a vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor vehicle safety brake control, and in particular, relates to a wheel speed signal processing system and a vehicle. Background Art

[0002] Wheel speed circuit processing plays a very important role in automobile safety, especially in automobile braking systems. Currently, wheel speed processing is divided into single-circuit circuit processing, dual-circuit circuit processing and dual-redundant circuit processing. Single-circuit circuit processing cannot ensure that the wheel speed signal is still valid when a single point of failure occurs in the controller's internal circuit. Dual-redundant circuit processing makes the system complex and costly, affecting the performance and reliability of the braking safety system.

[0003] The Chinese patent with application number 202311175677.4 discloses a wheel speed signal processing circuit, vehicle and method. Among them, the circuit includes: an acquisition component for collecting current signals when the wheel rotates; a processing component for converting the current signal into a digital pulse signal and an analog signal corresponding to the digital pulse signal; a control component connected to the processing component, which is used to generate the current wheel speed and wheel speed direction of the wheel according to the digital pulse signal and the analog signal corresponding to the digital pulse signal. Therefore, through the wheel speed signal processing circuit, the problems that the current signal processing method is difficult to design with a separate analog circuit and the large number of components used, resulting in greater layout difficulties, are solved, the quality control of the wheel speed signal is achieved, the number of components is reduced, the cost is reduced, and the accuracy of signal processing is improved.

[0004] It is desirable to provide an improved wheel speed signal processing system, particularly with respect to reducing complexity and improving reliability. Summary of the invention

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

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a wheel speed signal processing system, including a sensor driving circuit and a calculation unit, the sensor driving circuit includes an integrated circuit, the integrated circuit is connected to the calculation unit and the wheel speed sensor, and the integrated circuit is provided with at least two paths.

[0007] The sensor driving circuit is provided with at least one circuit.

[0008] The calculation unit is provided with at least one path, and the calculation unit is configured to receive the wheel speed sensor signal processed by the integrated circuit.

[0009] The integrated circuit provides a voltage or current signal to the wheel speed sensor through a connected wire. The integrated circuit includes a first integrated circuit and a second integrated circuit. The first integrated circuit or the second integrated circuit receives and determines the voltage or current signal fed back by the wheel speed sensor. The first integrated circuit or the second integrated circuit transmits the wheel speed sensor signal to the calculation unit. The calculation unit receives and identifies the voltage or current of the wheel speed sensor signal respectively.

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

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

[0012] When the switching circuit is turned off by the calculation unit, the second integrated circuit drives the wheel speed sensor and receives the wheel speed sensor signal, and the second integrated circuit transmits the received wheel speed sensor signal to the second calculation 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 recognized by the first integrated circuit and the second integrated circuit at the same time. 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 calculation unit, the second integrated circuit transmits the received wheel speed sensor signal to the second calculation unit, the second calculation unit sends the received wheel speed sensor signal to the first calculation unit, and the first calculation unit determines the authenticity of the wheel speed sensor signal; or, the first calculation unit sends the received wheel speed sensor signal to the second calculation unit, and the second calculation unit determines the authenticity of the wheel speed sensor signal.

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

[0016] When the second calculation unit or the second integrated circuit fails, the first calculation 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 a short-circuit mode, the first calculation unit drives the wheel speed sensor and receives a wheel speed sensor signal through the first integrated circuit.

[0018] The present invention also provides a vehicle, comprising the wheel speed signal processing system.

[0019] The wheel speed signal processing system of the present invention has the following beneficial effects:

[0020] 1. Low cost: By combining the existing sensor circuit with a controller module in the vehicle, redundant detection of the wheel speed sensor is realized through a certain control logic. A single point failure in any circuit does not affect the recognition of the wheel speed signal, which can improve reliability.

[0021] 2. Simple design: It can be realized by using the circuits in many control modules of the vehicle. The existing circuits in the control modules can be connected according to this design, which reduces the complexity of the circuit design of the entire system;

[0022] 3. Simplify the design circuit of wheel speed redundant signal while realizing redundant control detection of two systems, avoiding signal interference caused by complex sensor design;

[0023] 4. One wheel speed sensor chip can be saved for autonomous driving needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] This specification includes the following drawings, which show the following contents:

[0025] Figure 1 It is a structural schematic diagram of the wheel speed signal processing system of the present invention;

[0026] Figure 2 It is a schematic diagram of the main control logic of the wheel speed signal processing system of the present invention;

[0027] Figure 3 is another control logic schematic diagram of the wheel speed signal processing system of the present invention;

[0028] The markings in the figure are:

[0029] 1. First integrated circuit; 2. Second integrated circuit; 3. Wheel speed sensor; 4. Switching circuit; 5. First calculation unit; 6. Second calculation unit;

[0030] In the above drawings:

[0031] -------, indicating a circuit loop;

[0032] Indicates a functional module. DETAILED DESCRIPTION

[0033] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0034] First, as Figures 1 to 3 As shown, an embodiment of the present invention provides a wheel speed signal processing system, including a sensor driving circuit and a calculation unit, wherein the sensor driving circuit includes an integrated circuit, the integrated circuit is connected to the calculation unit and the wheel speed sensor, and the integrated circuit is provided with at least two paths.

[0035] Specifically, the wheel speed sensor is a sensor used to measure the rotation speed of the car's wheels. The sensor driver circuit is responsible for driving the wheel speed sensor to accurately measure the rotation speed of the wheel. The wheel speed sensor usually generates electrical signals by sensing the changes in the magnetic field generated by the wheel speed. These electrical signals are processed by the sensor driver circuit and converted into digital signals or analog signals suitable for subsequent control system processing.

[0036] In the embodiment of the present invention, the integrated circuit refers to a wheel speed sensor driving function circuit and a detection circuit constructed using existing electronic components, and can also be designed as an integrated chip with this function.

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

[0038] The sensor driving circuit is composed of preset integrated circuits and electronic components, and at least one integrated circuit is connected to the wheel speed sensor through a wire.

[0039] The set current loop can be realized through electrical connection of preset integrated circuits and electronic components. The second integrated circuit also has the function of driving the wheel speed sensor and receiving the sensor signal. The implementation mode or circuit design in the circuit may be different, such as the first integrated circuit high-side drive (high-side drive refers to adding a controllable switch at the power supply end of the circuit, and driving the circuit by controlling this switch), and the second integrated circuit bottom-side drive (bottom-side drive refers to adding a controllable switch at the ground end of the circuit, and controlling this switch by closing the ground wire).

[0040] The wheel speed signal processing system provided by the embodiment of the present invention can solve the complexity of redundant backup of multiple wheel speed sensors and the problem that the redundant wheel speed driving circuit of the autonomous driving vehicle is too complicated. Through the loop improvement design in the circuit design of this system, the circuit in the existing vehicle control module is used for corresponding connection, and it is realized through software control logic, which saves design costs and improves the performance and reliability of the entire braking safety system.

[0041] The wheel speed signal processing system provided by the embodiment of the present invention can improve the driving safety of motor vehicles. When any single point of the wheel speed signal detection circuit fails, the system improves the circuit connection relationship of the circuit to provide a reliable wheel speed signal for the vehicle's safe braking and parking brake.

[0042] like Figures 1 to 3 As shown, the integrated circuit provides a voltage or current signal to the wheel speed sensor through a connected wire. In an embodiment of the present invention, the integrated circuit includes a first integrated circuit and a second integrated circuit. The first integrated circuit first detects the wheel speed signal through a switching circuit and a circuit loop generated by the wheel speed sensor. The first integrated circuit or the second integrated circuit receives and determines the voltage or current signal fed back by the wheel speed sensor. The first integrated circuit or the second integrated circuit transmits the wheel speed sensor signal to the calculation unit, and the calculation unit receives and identifies the voltage or current of the wheel speed sensor signal respectively.

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

[0044] In the embodiment of the present invention, a switching circuit for controlling the driving circuit is provided to connect the sensor driving circuit and the switching circuit in the system. When the first calculation unit and the first integrated circuit are both fault-free, the first calculation unit controls the switching circuit to form a detection path between the first integrated circuit and the wheel speed sensor, and the signal detected by the first integrated circuit is transmitted to the first calculation unit.

[0045] In an embodiment of the present invention, the calculation unit includes a first calculation unit and a second calculation unit, the first calculation unit is connected to the first integrated circuit, the second calculation unit is connected to the second integrated circuit, the switching circuit is controlled by the first calculation unit and the second calculation unit respectively, when the first calculation unit turns on the switching circuit, the current of the wheel speed sensor flows back to the first integrated circuit through the switching circuit, and the first integrated circuit processes the wheel speed sensor signal and inputs it to the first calculation unit. When the first calculation unit or the first integrated circuit cannot work, the second calculation unit turns off the switching circuit through the control circuit, and the second integrated circuit and the wheel speed sensor form a wheel speed detection loop, and the signal detected by the second integrated circuit is transmitted to the second calculation unit.

[0046] In the embodiment of the present invention, when the switching circuit is turned off by the calculation unit, the second integrated circuit drives the wheel speed sensor and receives the wheel speed sensor signal, and the second integrated circuit transmits the received wheel speed sensor signal to the second calculation unit.

[0047] In an embodiment of the present invention, a first integrated circuit is connected to one end of a wheel speed sensor, and a second integrated circuit is connected to the other end of the wheel speed sensor. The signal of the wheel speed sensor is recognized by both 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 can be identified and verified, and the authenticity of the wheel speed sensor signal can be redundantly judged.

[0048] In the embodiment of the present invention, the first integrated circuit transmits the received wheel speed sensor signal to the first calculation unit, the second integrated circuit transmits the received wheel speed sensor signal to the second calculation unit, the second calculation unit sends the received wheel speed sensor signal to the first calculation unit, and the first calculation unit determines the authenticity of the wheel speed sensor signal. Alternatively, the first calculation unit sends the received wheel speed sensor signal to the second calculation unit, and the second calculation unit determines the authenticity of the wheel speed sensor signal.

[0049] In the embodiment of the present invention, when the first calculation unit or the first integrated circuit fails, the second calculation unit drives the wheel speed sensor and receives the wheel speed sensor signal through the second integrated circuit.

[0050] In the embodiment of the present invention, when the second calculation unit or the second integrated circuit fails, the first calculation unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

[0051] In the embodiment of the present invention, when the switching circuit fails in a short-circuit mode, the first calculation unit drives the wheel speed sensor and receives the wheel speed sensor signal through the first integrated circuit.

[0052] Through the above operation, a single wheel speed sensor signal can be redundantly driven by two computing units in the system to obtain the signal.

[0053] In a second aspect, the present invention further provides a vehicle, comprising a wheel speed signal processing system of the above structure. The specific structure of the wheel speed signal processing system can be referred to Figures 1 to 3 Since the vehicle of the present invention includes the wheel speed signal processing system in the above embodiment, it has all the advantages of the above wheel speed signal processing system.

[0054] The wheel speed signal processing system can be integrated into the vehicle's control modules, such as ONE-BOX (wire-controlled brake system), iBooster (electronic brake booster), BCU (body control unit), CCU (central control unit), ACU (airbag controller), etc. The wheel speed signal processing system can be integrated into a controller module or a discrete controller module to achieve dual-path detection signal function 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 is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. Wheel speed signal processing system, characterized by: It comprises a sensor driving circuit and a calculation unit. The sensor driving circuit comprises an integrated circuit. The integrated circuit is connected with the calculation unit and the wheel speed sensor. The integrated circuit is provided with at least two paths.

2. The wheel speed signal processing system according to claim 1, characterized in that: The sensor driving circuit is provided with at least one circuit.

3. The wheel speed signal processing system according to claim 1, characterized in that: The calculation unit is provided with at least one path, and the calculation unit is configured to receive the wheel speed sensor signal 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 a voltage or current signal to the wheel speed sensor through a connected wire. The integrated circuit includes a first integrated circuit and a second integrated circuit. The first integrated circuit or the second integrated circuit receives and determines the voltage or current signal fed back by the wheel speed sensor. The first integrated circuit or the second integrated circuit transmits the wheel speed sensor signal to the calculation unit. The calculation unit receives and identifies the voltage or current of the wheel speed sensor signal respectively.

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

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

7. The wheel speed signal processing system according to claim 6, characterized in that: When the switching circuit is turned off by the calculation unit, the second integrated circuit drives the wheel speed sensor and receives the wheel speed sensor signal, and the second integrated circuit transmits the received wheel speed sensor signal to the second calculation unit.

8. The wheel speed signal processing system according to claim 6, characterized in that: 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 recognized by the first integrated circuit and the second integrated circuit at the same time. 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 according to claim 8, characterized in that: The first integrated circuit transmits the received wheel speed sensor signal to the first calculation unit, the second integrated circuit transmits the received wheel speed sensor signal to the second calculation unit, the second calculation unit sends the received wheel speed sensor signal to the first calculation unit, and the first calculation unit determines the authenticity of the wheel speed sensor signal; Alternatively, the first calculation unit sends the received wheel speed sensor signal to the second calculation unit, and the second calculation unit determines the authenticity of the wheel speed sensor signal.

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

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

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

13. A vehicle, characterized in that: A wheel speed signal processing system comprising any one of claims 1 to 12.

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