Wheel speed signal processing system and vehicle

Abstract

The utility model 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 a vehicle, redundancy detection of the wheel speed sensor is achieved through certain control logic, identification of wheel speed signals is not affected by single-point failure in any circuit, and reliability can be improved. The utility model further discloses a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the motor vehicle safety brake control technical field, specifically, the utility model relates to a wheel speed signal processing system and vehicle. BACKGROUND

[0002] Wheel speed circuit processing occupies a very important position in automobile safety, especially in automobile brake system, current wheel speed processing is divided into single circuit loop circuit processing, double circuit loop circuit processing and double redundant circuit loop processing. Single circuit loop circuit processing cannot achieve wheel speed signal still effective under single point failure of controller internal circuit, double redundant circuit loop processing makes the system become complex and high cost, which affects the performance and reliability of brake safety system.

[0003] The Chinese patent with the application number 202311175677.4 discloses a wheel speed signal processing circuit, vehicle and method. Among them, the circuit includes: a collection component for collecting current signals when the wheels rotate; a processing component for converting the current signals into digital pulse signals and analog signals corresponding to the digital pulse signals; a control component connected with the processing component, for generating the current wheel speed and wheel speed direction of the wheels according to the digital pulse signals and the analog signals corresponding to the digital pulse signals. Thus, through the wheel speed signal processing circuit, the problems that the current signal processing method is difficult to design with separate analog circuit and the number of components used is large, resulting in large layout difficulty, etc. are solved, the quality control of wheel speed signal is realized, 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, in particular, regarding how to reduce complexity and improve reliability. UTILITY MODEL CONTENT

[0005] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a wheel speed signal processing system, which aims to improve reliability.

[0006] In order to achieve the above purpose, the utility model adopts the technical scheme of: a wheel speed signal processing system, including a sensor driving circuit and a computing unit, the sensor driving circuit includes an integrated circuit, the integrated circuit is connected with the computing unit and a 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 path.

[0008] The computing unit is provided with at least one path, and the computing unit is arranged 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 the 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, and 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 comprises a switching circuit for controlling the sensor driving circuit, and the switching circuit is controlled by at least one of the computing units.

[0011] The computing unit includes a first computing unit and a second computing unit, the first computing unit is connected with the first integrated circuit, the second computing unit is connected with 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, and the wheel speed sensor signals are processed by the first integrated circuit and input 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 signals, and the second integrated circuit transmits the received wheel speed sensor signals to the second computing unit.

[0013] One end of the wheel speed sensor is connected with the first integrated circuit, and the other end of the wheel speed sensor is connected with the second integrated circuit, the signals of the wheel speed sensor are identified by the first integrated circuit and the second integrated circuit at the same time, the wheel speed sensor signals are identified and verified by comparing the signals of the first integrated circuit and the second integrated circuit, and the authenticity of the wheel speed sensor signals is judged.

[0014] The first integrated circuit transmits the received wheel speed sensor signals to the first computing unit, the second integrated circuit transmits the received wheel speed sensor signals to the second computing unit, the second computing unit sends the received wheel speed sensor signals to the first computing unit, and the authenticity of the wheel speed sensor signals is judged by the first computing unit; or the first computing unit sends the received wheel speed sensor signals to the second computing unit, and the authenticity of the wheel speed sensor signals is judged by the second computing unit.

[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 signals 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 signals 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 utility model 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 achieved through certain control logic. A single point failure in any circuit will not affect the recognition of the wheel speed signal, thereby improving reliability.

[0021] 2. Simple design: This can be achieved by utilizing the circuits in many control modules of the vehicle. By using the existing circuits in the control modules and connecting them according to this design, the complexity of the entire system circuit design is reduced.

[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 manual includes the following drawings, which show the following contents:

[0025] Fig. 1 It is a structural diagram of the wheel speed signal processing system of the utility model;

[0026] Fig. 2 This is a schematic diagram of the main control logic of the wheel speed signal processing system of the utility model;

[0027] Fig. 3 This is another control logic diagram of the wheel speed signal processing system of the utility model;

[0028] The following are marked in the figure:

[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 embodiments of the present application will be further described in detail below with reference to the drawings, and the purpose is to help the skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical scheme of the present application, and to help its implementation.

[0034] In a first aspect, as Figs. 1-3 The embodiment of the present application provides a wheel speed signal processing system, which comprises a sensor driving circuit and a computing unit, the sensor driving circuit comprises an integrated circuit, the integrated circuit is connected with the computing unit and a 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 a vehicle wheel. The sensor driving circuit is responsible for driving the wheel speed sensor to accurately measure the rotation speed of the wheel. The wheel speed sensor usually generates an electric signal by sensing the magnetic field change generated by the rotation speed of the wheel. After the processing of the sensor driving circuit, the electric signal is converted into a digital signal or an analog signal suitable for the subsequent control system processing.

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

[0037] In the embodiment of the present application, the sensor driving circuit is provided with at least one path, a current loop between the sensor and the driving circuit is arranged, and the computing unit is provided with at least one path, and the computing unit is arranged 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 with the wheel speed sensor through a wire.

[0039] The current loop arranged can be realized through electrical connection of preset integrated circuits and electronic components, the second integrated circuit also has the functions of driving the wheel speed sensor and receiving the sensor signal, and the implementation mode or circuit design in the circuit can be different, for example, the first integrated circuit is high-side driven (high-side driving refers to adding a controllable switch at the power supply end of the circuit, and the circuit is driven by controlling the switch), and the second integrated circuit is low-side driven (low-side driving refers to adding a controllable switch at the ground end of the circuit, and the switch is controlled by closing the ground wire).

[0040] The wheel speed signal processing system provided by this utility model solves the complexity of redundant backups for multiple wheel speed sensors and the overly complex redundant wheel speed drive circuits for autonomous vehicles. By improving circuit design, utilizing existing circuits in vehicle control modules for appropriate connections, and implementing software control logic, this system reduces design costs while improving the performance and reliability of the entire braking safety system.

[0041] The wheel speed signal processing system provided by the embodiment of the present utility model 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 to provide a reliable wheel speed signal for the vehicle's safe braking and parking brake.

[0042] like Figs. 1-3 As shown, the integrated circuit provides a voltage or current signal to the wheel speed sensor via connected wires. In this embodiment of the utility model, 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 a computing unit, which receives and identifies the voltage or current of the wheel speed sensor signal, respectively.

[0043] like Figs. 1-3 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 an embodiment of the present invention, a switching circuit is provided to control the drive circuit, connecting the sensor drive circuit and the switching circuit in the system. When both the first computing unit and the first integrated circuit are operating normally, the first computing 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 computing 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, and the second calculation unit is connected to the second integrated circuit. A switching circuit is controlled by the first and second calculation units, respectively. When the first calculation unit activates the switching circuit, the current from 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 then inputs it to the first calculation unit. When the first calculation unit or the first integrated circuit fails to operate, the second calculation unit, through a control circuit, deactivates the switching circuit. Simultaneously, the second integrated circuit and the wheel speed sensor form a wheel speed detection circuit, and the signal detected by the second integrated circuit is transmitted to the second calculation unit.

[0046] In the embodiment of the utility model, through the computing unit, the second integrated circuit drives the wheel speed sensor when the switching circuit is closed, and receives the wheel speed sensor signal, the second integrated circuit transmits the received wheel speed sensor signal to the second computing unit.

[0047] In the embodiment of the utility model, one end of the wheel speed sensor is connected with the first integrated circuit, and the other end of the wheel speed sensor is connected with the second integrated circuit, the signal of the wheel speed sensor is identified by the first integrated circuit and the second integrated circuit simultaneously, the wheel speed sensor signal can be identified and verified by comparing the signals of the first integrated circuit and the second integrated circuit, and the authenticity of the wheel speed sensor signal is determined redundantly.

[0048] In the embodiment of the utility model, 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, the second computing unit sends the received wheel speed sensor signal to the first computing unit, and the authenticity of the wheel speed sensor signal is determined by the first computing unit.Or, the first computing unit sends the received wheel speed sensor signal to the second computing unit, and the authenticity of the wheel speed sensor signal is determined by the second computing unit.

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

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

[0051] In the embodiment of the utility model, when the switching circuit fails in the short circuit mode, the first computing unit drives the wheel speed sensor through the first integrated circuit and receives the wheel speed sensor signal.

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

[0053] In a second aspect, the utility model also provides a vehicle, which comprises the wheel speed signal processing system with the above structure. Figs. 1-3 , which will not be repeated here. Since the vehicle of the utility model comprises 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 in a control module of the vehicle, such as a ONE-BOX (line control brake system), an iBooster (electronic brake booster), a BCU (body control unit), a CCU (central control unit), an ACU (airbag controller), and the like. The wheel speed signal processing system can be integrated in a certain controller module or in a separate controller module, and realizes the dual-channel detection signal function without increasing the number of wheel speed sensors.

[0055] The whole vehicle and the vehicle according to the present application include, but are not limited to, passenger cars and commercial vehicles.

[0056] The present application is described above by way of example with reference to the drawings. Obviously, the specific implementation of the present application is not limited to the above-described manner. As long as various non-essential improvements are made by adopting the method concept and technical solution of the present application, or the above-mentioned concept and technical solution of the present application is directly applied to other occasions without improvement, they are all within the protection scope of the present application.

Claims

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

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

3. The wheel speed signal processing system of claim 1, wherein: The computing unit is provided with at least one path, and the computing unit is configured to receive a 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, and 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 a 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 computing unit, and the computing 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, wherein: The switching circuit for controlling the sensor driving circuit is further included, and the switching circuit is controlled by at least one computing unit.

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 with the first integrated circuit, the second computing unit is connected with 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, and the wheel speed sensor signal processed by the first integrated circuit is input 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, and the second integrated circuit transmits the received wheel speed sensor signal to the second computing unit.

8. The wheel speed signal processing system of claim 6, wherein: One end of the wheel speed sensor is connected with the first integrated circuit, and the other end of the wheel speed sensor is connected with the second integrated circuit, the signals of the wheel speed sensor are identified by the first integrated circuit and the second integrated circuit at the same time, the wheel speed sensor signal is identified and verified by comparing the signals of the first integrated circuit and the second integrated circuit, and the authenticity of the wheel speed sensor signal is judged.

9. The wheel speed signal processing system of claim 8, wherein: The first computing unit transmits the received wheel speed sensor signal to the first computing unit, the second computing unit transmits the received wheel speed sensor signal to the second computing unit, the second computing unit transmits the received wheel speed sensor signal to the first computing unit, and the authenticity of the wheel speed sensor signal is judged by the first computing unit. Alternatively, the first computing unit transmits the received wheel speed sensor signal to the second computing unit, and the authenticity of the wheel speed sensor signal is judged by the second computing unit.

10. The wheel speed signal processing system of claim 6, wherein: 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. The wheel speed signal processing system of claim 6, wherein: 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. The wheel speed signal processing system of claim 6, wherein: When the switching circuit fails in a 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. A vehicle characterized by: A wheel speed signal processing system comprising any of claims 1 to 12.

Images