Wheel sensor analysis circuit
Through the coordinated work of the resistance sampling circuit, wheel speed type setting circuit, and clock and current pulse edge sampling circuit, the problem of relying on dedicated chips for wheel speed signal analysis in the vehicle field is solved, and the cost is achieved. High compatibility and accurate signal resolution wheel sensor resolution circuit.
Patent Information
- Application Number
- CN202411100464.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2024-12-10
AI Technical Summary
In the prior art, the analysis of wheel speed signals of type 1, type 2 and type 3 in the automotive field relies on application-specific integrated chips, resulting in high costs and inconsistent application, especially in other industries, which are difficult to widely use.
Through the coordinated work of the resistance sampling circuit, wheel speed type setting circuit, comparison circuit and clock and current pulse edge sampling circuit, the precise acquisition and processing of the two and three sensor signals is achieved, reducing the complexity of design and maintenance.
The use of ordinary electronic components instead of special chips is realized, which reduces costs and improves system compatibility and flexibility, while maintaining high accuracy and reliability of signal resolution, forming an efficient closed-loop system.
Smart Images
Figure CN119109441A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of wheel sensor analysis circuits, and in particular to a wheel sensor analysis circuit. Background Art
[0002] In the existing automobile industry, wheel speed signals are divided into three types: Type 1, Type 2 and Type 3.
[0003] The second type of signal is a PWM current signal, which not only contains wheel speed information, but also comes with additional information such as direction and air gap; while the third type of signal is a current signal based on the AK protocol, which further includes direction, air gap and fault diagnosis information.
[0004] At present, although dedicated integrated chips are widely used in the automotive field to analyze these signals, this technology is not widely used in other industries due to the high cost of chip procurement.
[0005] Therefore, it is urgent to propose an analytical circuit designed using common electronic components specifically for type II and type III sensors, so as to reduce the cost and expand their application range. Summary of the invention
[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a wheel sensor analysis circuit to solve the problems raised in the above background technology. The present invention realizes the accurate collection and processing of type II and type III sensor signals through the coordinated work of the resistance sampling circuit, the wheel speed type setting circuit, the comparison circuit, and the clock and current pulse edge sampling circuit, and simplifies the design and maintenance process. The problems in the prior art are solved.
[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: a wheel sensor analysis circuit, comprising: The resistor sampling circuit converts the received current signal source IG1 of the wheel speed sensor into a stable voltage signal; a wheel speed type setting circuit, which distinguishes between type II and type III wheel speed sensors according to the voltage signal and extracts the corresponding speed pulse signal; A comparison circuit separates the speed pulse signal and converts it into a PWM signal (VF1) that can be read by a microprocessor for calculating the wheel speed; The clock and current pulse edge sampling circuit receives the PWM signal and sensor signals other than the target vehicle wheel speed sensor, performs pulse sampling according to the clock signal, and stores the additional information of the wheel speed for reading by the microprocessor; wherein, The wheel speed type setting circuit includes a resistor R7, a comparator U1 and a MOS tube T1. The comparator U1 has a non-inverting input end connected to the current signal source IG1, a reverse input end connected in series with the resistor R7 and then connected to the drain of the MOS tube T1, an output end connected to the microprocessor input interface, a source of the MOS tube T1 is grounded, and a gate connected to the microprocessor output interface.
[0008] Compared with the prior art, the present invention has the following beneficial effects: In order to solve the dependence of the existing dedicated integrated chip in the vehicle field on parsing type I, type II and type III wheel speed signals, the present invention first uses a resistor sampling circuit (composed of R1, R4 and C1) to convert the current signal of the sensor into a stable voltage signal, and then distinguishes the sensor type and extracts the speed pulse signal through the wheel speed type setting circuit (composed of R7, U1 and T1). Secondly, these signals are converted into PWM signals (VF1) readable by the microprocessor through a comparison circuit to achieve accurate calculation of the wheel speed. Finally, the clock and current pulse edge sampling circuit (composed of U3, U2, U6, U8, U4 and U5) performs pulse sampling on the PWM signal and other sensor signals, captures and stores additional information of the wheel speed for the microprocessor to read, thereby using low-cost general electronic components instead of expensive dedicated chips, which not only reduces costs, but also improves the compatibility and flexibility of the system, while maintaining the high accuracy and reliability of signal analysis, and realizing an efficient closed-loop system from signal acquisition to processing to information feedback. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 It is a structural schematic diagram of a wheel sensor analysis circuit proposed in one embodiment of the present invention; Figure 2 It is a principle block diagram of a wheel sensor analysis circuit proposed in one embodiment of the present invention; Figure 3 FIG. 4 is a diagram showing simulation results of a wheel sensor analysis circuit proposed in an embodiment of the present invention. DETAILED DESCRIPTION
[0010] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.
[0011] The technical principle of the present invention is: the current signal of the wheel speed sensor is first converted into a stable voltage signal through a resistor sampling circuit and a signal filtering and conditioning circuit composed of R1, R4 and C1, and then input into a wheel speed type setting circuit composed of R7, U1 and T1. The circuit extracts the corresponding speed pulse signal according to the sensor type, and the speed pulse signal is converted into a PWM signal that can be read by a microprocessor through a comparison circuit ( Figure 1 VF1 in the figure is used to calculate the wheel speed. At the same time, the clock and current pulse edge sampling circuit, composed of U3, U2, U6, U8, U4 and U5 integrated circuits, samples and stores the PWM signal and additional sensor signals (the additional sensor signals refer to other sensor signals except the wheel speed sensor) for reading by the microprocessor, thereby realizing accurate acquisition and processing of the wheel speed and its additional information.
[0012] like Figure 1-3 As shown, as an embodiment of the present invention, the present invention provides a technical solution: a wheel sensor analysis circuit, comprising: A resistor sampling circuit receives the current signal source IG1 of the wheel speed sensor; a signal filtering and conditioning circuit filters the current signal source IG1 through resistors R1, R4 and C1, and outputs a stable voltage signal; a wheel speed type setting circuit distinguishes between type II and type III wheel speed sensors according to the voltage signal, and extracts the corresponding speed pulse signal; a comparison circuit receives the speed pulse signal and converts it into a PWM signal (VF1) that can be read by a microprocessor for calculating the wheel speed; a clock and current pulse edge sampling circuit receives the PWM signal and other sensor signals except the wheel speed sensor of the target vehicle, and performs pulse sampling according to the clock signal, and stores the additional information of the wheel speed for reading by the microprocessor; a clock and current pulse edge sampling circuit is a data storage circuit for storing the additional information of the wheel speed after pulse sampling according to the clock signal.
[0013] As one embodiment of the present invention, the wheel speed type setting circuit includes a resistor R7, a comparator U1 and a MOS tube T1. In a specific implementation, the comparator U1 has a non-inverting input terminal connected to a current signal source IG1, a reverse input terminal connected in series with a resistor R7 and then connected to a drain of the MOS tube T1, an output terminal connected to an input interface of a microprocessor, a source of the MOS tube T1 is grounded, and a gate connected to an output interface of the microprocessor.
[0014] The signal filtering and conditioning circuit includes a resistor R1, a resistor R4 and a capacitor C1. In a specific implementation, one end of the resistor R1 is connected to one end of the resistor R4 and the current signal IG1 respectively, and the other end is grounded; the other end of the resistor R4 is connected to the in-phase input end of U1; one end of the capacitor C1 is connected to the current signal IG1, and the other end is grounded.
[0015] The clock and current pulse edge sampling circuit includes a comparator U3, a four-2-input AND gate chip U2, a timer U6, a digital chip U8, a chip U4 and a chip U5. In a specific implementation, the in-phase input terminal of the comparator U3 is connected to the junction of the resistor R4 and the in-phase input terminal of U1, the inverting input terminal is grounded, the output terminal is connected to pins 1 and 2 of U8, and pin 1 and pin 2 of U8 are interconnected; pin 3 of U2 is connected to the reset pin of U6, pin 2 of U2 is connected to pin 1 of chip U5, pin 1 of U2 is connected to pin 3 of the four-2-input NAND gate U7, and pin 1 and pin 2 of U7 are interconnected. Connect to the output end of U1; U6 threshold pin and trigger pin are interconnected and then grounded, U6 discharge end pin is connected in series with resistor R8 and resistor R10 in sequence and then connected to U6 output pin; U8 pin 9 is connected to U5 pin 1, U4 pin 1 and U7 pin 3 respectively, U8 pin 8 is connected to U6 output pin, U4 pin 3 and U5 pin 3 respectively; U8 pin 13 is connected to U4 pin 2; chip U4 pin 5 is connected to U5 pin 2, U8 pin 3, pin 4, pin 5, pin 6, pin 10, pin 11, pin 12 and pin 13 are parallel data output ports.
[0016] In one embodiment of the present invention, the quad 2-input AND gate chip U2 is model SN74HC08, the digital chip U8 uses the serial-to-parallel digital chip 74HC164, the quad 2-input NAND gate U7 is model SN74HC00, the comparators U3 and U1 are both single-channel comparators, both model TLV3201, and the MOS tube T1 is an NMOS tube.
[0017] As an embodiment of the present invention, in the proposed wheel sensor analysis circuit, the aforementioned wheel speed information at least includes the linear speed of the wheel or the direction of wheel rotation information or the air gap information reflecting the distance between the sensor and the wheel or the fault diagnosis information indicating potential faults or abnormalities or the temperature information or tire pressure information affecting the sensor performance or wheel safety or the vibration or impact information detected by the sensor or the battery or power status information ensuring the normal operation of the sensor. When collected and processed by the clock and current pulse edge sampling circuit, this information is stored or transmitted to the microprocessor, and after further analysis, it is used to realize advanced monitoring, diagnosis and control functions, which plays a vital role in improving the safety, reliability and overall performance of the vehicle.
[0018] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.
Claims
1. A wheel sensor analysis circuit, Features: include: The resistor sampling circuit converts the received current signal source IG1 of the wheel speed sensor into a stable voltage signal; a wheel speed type setting circuit, which distinguishes between type II and type III wheel speed sensors according to the voltage signal and extracts the corresponding speed pulse signal; A comparison circuit separates the speed pulse signal and converts it into a PWM signal that can be read by a microprocessor to calculate the wheel speed; The clock and current pulse edge sampling circuit receives the PWM signal and performs pulse sampling according to the clock signal for reading by the microprocessor; wherein, The wheel speed type setting circuit includes a resistor R7, a comparator U1 and a MOS tube T1. The comparator U1 has a non-inverting input end connected to the current signal source IG1, a reverse input end connected in series with the resistor R7 and then connected to the drain of the MOS tube T1, an output end connected to the microprocessor input interface, a source of the MOS tube T1 is grounded, and a gate connected to the microprocessor output interface.
2. A wheel sensor analysis circuit according to claim 1, Features: It also includes a data storage circuit that is connected to a clock and current pulse edge sampling circuit to store additional wheel speed information after pulse sampling according to a clock signal, wherein the additional wheel speed information includes at least linear speed or direction or air gap or fault diagnosis or temperature or tire pressure or vibration or impact or power supply status information that characterizes the overall status data of the wheel.
3. A wheel sensor analysis circuit according to claim 1, Features: It also includes a signal filtering and conditioning circuit connected to the resistance sampling circuit, the signal filtering and conditioning circuit includes a resistor R1, a resistor R4 and a capacitor C1, wherein: One end of the resistor R1 is respectively connected to one end of the resistor R4 and the current signal IG1, and the other end is grounded; The other end of the resistor R4 is connected to the in-phase input end of U1; One end of the capacitor C1 is connected to the current signal IG1 , and the other end is grounded.
4. A wheel sensor analysis circuit according to claim 1, Features: The clock and current pulse edge sampling circuit includes a comparator U3, a four 2-input AND gate chip U2, a timer U6, a digital chip U8, a chip U4 and a chip U5, wherein: The non-inverting input terminal of the comparator U3 is connected to the junction of the resistor R4 and the non-inverting input terminal of U1, the inverting input terminal is grounded, and the output terminal is connected to the pins 1 and 2 of U8 respectively, and the pins 1 and 2 of U8 are interconnected; U2 pin 3 is connected to U6 reset pin, U2 pin 2 is connected to chip U5 pin 1, U2 pin 1 is connected to quad 2-input NAND gate U7 pin 3, U7 pin 1 and pin 2 are interconnected and connected to U1 output terminal; The threshold pin and trigger pin of U6 are interconnected and then grounded, and the discharge pin of U6 is connected in series with resistors R8 and R10 in sequence and then connected to the output pin of U6; U8 pin 9 is connected to U5 pin 1, U4 pin 1 and U7 pin 3 respectively, U8 pin 8 is connected to U6 output pin, U4 pin 3 and U5 pin 3 respectively; U8 pin 13 is connected to U4 pin 2; Chip U4 pin 5 is connected to U5 pin 2.
5. A wheel sensor analysis circuit according to claim 4, Features: The model of the four 2-input AND gate chip U2 is SN74HC08, the digital chip U8 adopts the serial-to-parallel digital chip 74HC164, and the model of the four 2-input NAND gate U7 is SN74HC00.
6. A wheel sensor analysis circuit according to claim 4, Features: The comparators U3 and U1 are both single-channel comparators, and both are TLV3201.
7. A wheel sensor analysis circuit according to claim 1, Features: The MOS tube T1 is an NMOS tube.