A commercial vehicle wheel speed signal acquisition and processing system

Abstract

The present invention is applicable to the technical field of wheel speed signal acquisition, and provides a commercial vehicle wheel speed signal acquisition and processing system, comprising a signal input acquisition module, a signal processing module and an MCU processing module for acquiring wheel speed signals generated during wheel rotation, wherein the signal input acquisition module and the signal processing module exchange information via a wireless base station, and the signal processing module exchanges information with the MCU processing module via a wireless base station, wherein the signal input acquisition module comprises a first wheel speed sensor and a second wheel speed sensor, wherein the first wheel speed sensor and the second wheel speed sensor respectively acquire a wheel speed signal of one wheel and a wheel speed signal of another wheel. The commercial vehicle wheel speed signal acquisition and processing system can detect two wheel speed signals in real time by acquiring, processing and calculating wheel speed signals for commercial vehicles, and can report a fault when a wheel speed fault occurs, thereby ensuring the stability of the vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel speed signal acquisition, and in particular relates to an acquisition and processing system for commercial vehicle wheel speed signals. Background Art

[0002] Commercial vehicles are cars that are designed and technically used primarily for transporting people and goods, and can tow trailers. Commercial vehicles include all trucks and buses with more than nine seats, and are mainly divided into five categories: buses, trucks, semi-trailer tractors, incomplete bus vehicles, and incomplete truck vehicles.

[0003] Wheel speed is the basis of all electronically controlled braking systems and is the only sensor for estimating wheel speed, reference vehicle speed, wheel deceleration and slip rate. Currently, commercial vehicles generally use electromagnetic wheel speed sensors in conjunction with gear rings to generate sinusoidal wheel speed signals, which are processed by the circuit and become regular square wave signals that enter the control MCU, where they are sampled and calculated. In commercial vehicles, due to different drive forms, there may be two wheels on one side of the same drive shaft used in parallel. At this time, the two wheel speed signals generated when the vehicle is running need to be analyzed and processed. Summary of the invention

[0004] The present invention provides a wheel speed signal acquisition and processing system for commercial vehicles, aiming to solve the problem that two wheels are used in parallel on one side of the same drive shaft in commercial vehicles, and the two generated wheel speed signals need to be analyzed and processed.

[0005] The present invention is implemented as follows: a commercial wheel speed signal acquisition and processing system includes a signal input acquisition module for acquiring wheel speed signals generated during wheel rotation, a signal processing module and an MCU processing module, characterized in that: the signal input acquisition module and the signal processing module exchange information through a wireless base station, and the signal processing module exchanges information with the MCU processing module through a wireless base station;

[0006] The signal input acquisition module acquires two wheel speed signals, namely sign1 and sign2; the signal processing module processes the received sign1 signal and generates Vpwm1 and Vadc1; the signal processing module processes the received sign2 signal and generates Vpwm2 and Vadc2;

[0007] The signal processing module includes Vdac, which is a reference voltage generated by the MCU processing module and functions to provide a reference voltage for the operational amplifier;

[0008] The MCU processing module processes and analyzes the collected Vpwm1, Vadc1, Vpwm2, and Vadc2, and generates the reference voltage Vref required by the hysteresis comparator through Vdac. The detected signal determines the real-time speed of the vehicle, monitors the wheel operation fault, and records and reports the fault.

[0009] The signal input acquisition module includes a first wheel speed sensor and a second wheel speed sensor, wherein the first wheel speed sensor and the second wheel speed sensor respectively acquire a wheel speed signal of one wheel and a wheel speed signal of another wheel;

[0010] The signal processing module is composed of two processing mechanisms, one of which includes a system power supply, a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor and a first MOS tube, and the other includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a second MOS tube. The two processing mechanisms respectively process the received sign1 signal and generate Vpwm1 and Vadc1, and process the received sign2 signal and generate Vpwm2 and Vadc2;

[0011] The signal processing module generates system power, the sixth resistor and the seventh resistor divide the voltage to turn on the first MOS tube, the thirteenth resistor and the fourteenth resistor divide the voltage to turn on the second MOS tube, at this time, sign1 flows through the first MOS tube through the fourth resistor for sampling, generating a sine wave waveform, sign2 flows through the second MOS tube through the eleventh resistor for sampling, generating a sine wave waveform, and the sampling signal Vin1 of the wheel speed sign1 and the sampling signal Vin2 of the wheel speed sign2 are obtained through the sampling part;

[0012] The Vin1 signal passes through a low-pass filter formed by the second resistor and the second capacitor, and then passes through a hysteresis comparator formed by the first operational amplifier, the first resistor, the first capacitor and the third resistor to generate a Vpwm1 signal, which is transmitted to the MCU processing module. The other signal passes through a low-pass filter formed by the fifth resistor and the third capacitor to generate Vadc1, which is directly transmitted to the MCU processing module.

[0013] The Vin2 signal passes through a low-pass filter formed by the ninth resistor and the fifth capacitor, and then passes through a hysteresis comparator formed by the second operational amplifier, the eighth resistor, the fourth capacitor and the tenth resistor to generate a Vpwm2 signal to be transmitted to the MCU processing module. The other signal passes through a low-pass filter formed by the twelfth resistor and the sixth capacitor to generate Vadc2, which is directly transmitted to the MCU processing module.

[0014] Preferably, the MCU processing module is composed of a central processing unit, a counter, an A / D converter and a D / A converter. The counter generates and collects PWM, Vpwm1 and Vpwm2 are collected by the counter, the D / A converter converts the digital quantity into an analog quantity, and the generated reference voltage Vdac is provided to the first operational amplifier as a reference voltage. The A / D converter converts the analog quantity into a digital quantity, and the A / D converter reads the data of Vadc1 and Vadc2.

[0015] Preferably, after the vehicle system is powered on, the entire system is initialized. After the initialization is completed, the entire circuit system is in a waiting state, and the first MOS tube and the second MOS tube are turned on when the system power supply is powered on, ready to collect wheel speed signals. Beneficial Effects

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: a commercial vehicle wheel speed signal acquisition and processing system of the present invention can detect two-way wheel speed signals in real time by acquiring, processing and calculating wheel speed signals for commercial vehicles, and can report a fault when a wheel speed fault occurs, thereby enabling the entire vehicle system to be adjusted in time to ensure the stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural block diagram of the present invention;

[0018] Figure 2 It is a structural block diagram of the signal input acquisition module in the present invention;

[0019] Figure 3 is a structural diagram of the signal processing module in the present invention;

[0020] Figure 4 It is a structural block diagram of the MCU processing module in the present invention;

[0021] Figure 5 It is a schematic diagram of the principle of the MCU processing module in the present invention;

[0022] Figure 6 It is the work flow chart of the present invention.

[0023] In the figure: 1. signal input acquisition module; 2. signal processing module; 3. MCU processing module; 4. first wheel speed sensor; 5. second wheel speed sensor; 6. system power supply; 7. first operational amplifier; 8. first resistor; 9. second resistor; 10. third resistor; 11. fourth resistor; 12. fifth resistor; 13. sixth resistor; 14. seventh resistor; 15. eighth resistor; 16. ninth resistor; 17. tenth resistor; 18. eleventh resistor; 19. twelfth resistor; 20. thirteenth resistor; 21. fourteenth resistor; 22. first capacitor; 23. second capacitor; 24. third capacitor; 25. fourth capacitor; 26. fifth capacitor; 27. sixth capacitor; 28. first MOS tube; 29. ​​second MOS tube; 30. central processing unit; 31. counter; 32. A / D converter; 33. D / A converter; 34. second operational amplifier. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] See also Figure 1-6 The present invention provides a technical solution: a commercial vehicle wheel speed signal acquisition and processing system, comprising a signal input acquisition module 1 for acquiring a wheel speed signal generated during wheel rotation, a signal processing module 2 and an MCU processing module 3, the signal input acquisition module 1 and the signal processing module 2 interact with each other through a wireless base station, and the signal processing module 2 interacts with the MCU processing module 3 through the wireless base station.

[0026] The signal input acquisition module 1 acquires two wheel speed signals, sign1 and sign2 respectively. The signal processing module 2 processes the received sign1 signal and generates Vpwm1 and Vadc1. The signal processing module 2 processes the received sign2 signal and generates Vpwm2 and Vadc2.

[0027] The signal processing module 2 includes Vdac, which is a reference voltage generated by the MCU processing module 3 and functions to provide a reference voltage for the operational amplifier.

[0028] MCU processing module 3 processes and analyzes the collected Vpwm1, Vadc1, Vpwm2, and Vadc2, and generates the reference voltage Vref required by the hysteresis comparator through Vdac. The detected signal determines the real-time speed of the vehicle, monitors the wheel operation faults, and records and reports the faults that occur.

[0029] Furthermore, the signal input acquisition module 1 includes a first wheel speed sensor 4 and a second wheel speed sensor 5 , and the first wheel speed sensor 4 and the second wheel speed sensor 5 collect a wheel speed signal and another wheel speed signal respectively.

[0030] Furthermore, the signal processing module 2 is composed of two processing mechanisms, one processing mechanism includes a system power supply 6, a first operational amplifier 7, a first resistor 8, a second resistor 9, a third resistor 10, a fourth resistor 11, a fifth resistor 12, a sixth resistor 13, a seventh resistor 14, a first capacitor 22, a second capacitor 23, a third capacitor 24 and a first MOS tube 28, and the other processing mechanism includes an eighth resistor 15, a ninth resistor 16, a tenth resistor 17, an eleventh resistor 18, a twelfth resistor 19, a thirteenth resistor 20, a fourteenth resistor 21, a fourth capacitor 25, a fifth capacitor 26, a sixth capacitor 27 and a second MOS tube 29. The two processing mechanisms respectively process the received sign1 signal and generate Vpwm1 and Vadc1, and process the received sign2 signal and generate Vpwm2 and Vadc2.

[0031] Further, the signal processing module 2 generates a system power supply 6, the sixth resistor 13 and the seventh resistor 14 divide the voltage to turn on the first MOS tube 28, and the thirteenth resistor 20 and the fourteenth resistor 21 divide the voltage to turn on the second MOS tube 29. At this time, sign1 flows through the first MOS tube 28 through the fourth resistor 11 for sampling, generating a sine wave waveform, and sign2 flows through the eleventh resistor 18 for sampling through the second MOS tube 29 to generate a sine wave waveform. The sampling signal Vin1 of the wheel speed sign1 and the sampling signal Vin2 of the wheel speed sign2 are obtained through the sampling part.

[0032] Furthermore, the Vin1 signal passes through a low-pass filter formed by the second resistor 9 and the second capacitor 23 and then passes through a hysteresis comparator formed by the first operational amplifier 7, the first resistor 8, the first capacitor 22 and the third resistor 10 to generate a Vpwm1 signal transmitted to the MCU processing module 3, and the other path passes through a low-pass filter formed by the fifth resistor 12 and the third capacitor 24 to generate Vadc1, which is directly transmitted to the MCU processing module 3.

[0033] Furthermore, the Vin2 signal passes through a low-pass filter formed by the ninth resistor 16 and the fifth capacitor 26 and then passes through a hysteresis comparator formed by the second operational amplifier 34, the eighth resistor 15, the fourth capacitor 25 and the tenth resistor 17 to generate a Vpwm2 signal transmitted to the MCU processing module 3, and the other path passes through a low-pass filter formed by the twelfth resistor 19 and the sixth capacitor 27 to generate Vadc2, which is directly transmitted to the MCU processing module 3.

[0034] Furthermore, the MCU processing module 3 is composed of a central processing unit 30, a counter 31, an A / D converter 32 and a D / A converter 33. The counter 31 generates and collects PWM, Vpwm1 and Vpwm2 are collected by the counter 31, the D / A converter 33 converts the digital quantity into an analog quantity, and the generated reference voltage Vdac is provided to the first operational amplifier 7 as a reference voltage. The A / D converter 32 converts the analog quantity into a digital quantity, and the A / D converter 32 reads the data of Vadc1 and Vadc2.

[0035] Furthermore, after the vehicle system is powered on, the entire system is initialized. After the initialization is completed, the entire circuit system is in a waiting state. The first MOS tube 28 and the second MOS tube 29 are turned on when the system power supply 6 is powered on, ready to collect wheel speed signals.

[0036] In this embodiment, when the wheel speed signal is generated, the analog value will be read in real time through Vadc1 and Vadc2. When Vadc1 and Vadc2 are detected, the system will consider that there is a wheel speed signal input. At this time, the MCU processing module 3 generates a reference voltage Vref through Vdac, and detects Vpwm1 and Vpwm2 generated by the output of the first operational amplifier 7 and the second operational amplifier 34 at the same time. The read Vadc1 and Vpwm1 are

[0037] Vadc2 and Vpwm2 are compared with the set values. If the sampled Vadc1 is within the set value range when Vpwm1 changes, the real-time speed can be obtained through Vpwm. If it is not within the set range, the value of Vref needs to be adjusted until the sampled Vpwm meets the requirements. After that, the speeds of the two wheels can be calculated respectively according to Vpwm1 and Vpwm2. If the wheels are operating normally, the two should be equal, so as to obtain the real-time speed. If one or two wheels have problems, the fault needs to be reported to the vehicle controller.

[0038] The working principle and use process of the present invention: After the present invention is installed, after the vehicle system is powered on, the entire system is initialized. After the initialization is completed, the entire circuit system is in a waiting state. The first MOS tube 28 and the second MOS tube 29 are turned on when the system power supply 6 is powered on, and are ready to collect wheel speed signals. When the wheel speed signal is generated, the analog value will be read in real time through Vadc1 and Vadc2. When Vadc1 and Vadc2 are detected, the system will consider that there is a wheel speed signal input. At this time, the MCU processing module 3 generates a reference voltage Vref through Vdac, and detects Vpwm1 and Vpwm2 generated by the outputs of the first operational amplifier 7 and the second operational amplifier 34 at the same time. The read Vadc1 and Vpwm1, Vadc2 and Vpwm2 are compared with the set values. If the sampled Vadc1 is within the set value range when Vpwm1 changes, the real-time speed can be obtained through Vpwm. If it is not within the set range, the value of Vref needs to be adjusted until the sampled Vpwm meets the requirements. After that, the speeds of the two wheels can be calculated respectively according to Vpwm1 and Vpwm2. If the wheels are operating normally, the two should be equal, so as to obtain the real-time speed. If one or two wheels have problems, this fault needs to be reported to the vehicle controller.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A commercial vehicle wheel speed signal acquisition and processing system, comprising a signal input acquisition module (1) for acquiring a wheel speed signal generated during wheel rotation, a signal processing module (2) and an MCU processing module (3), characterized in that: The signal input acquisition module (1) and the signal processing module (2) perform information exchange via a wireless base station, and the signal processing module (2) performs information exchange with the MCU processing module (3) via a wireless base station; The signal input acquisition module (1) acquires two wheel speed signals, namely sign1 and sign2; the signal processing module (2) processes the received sign1 signal and generates Vpwm1 and Vadc1; the signal processing module (2) processes the received sign2 signal and generates Vpwm2 and Vadc2; The signal processing module (2) comprises Vdac, which is a reference voltage generated by the MCU processing module (3) and functions to provide a reference voltage for the operational amplifier; The MCU processing module (3) processes and analyzes the collected Vpwm1, Vadc1, Vpwm2, and Vadc2, and generates a reference voltage Vref required by the hysteresis comparator through Vdac, determines the real-time speed of the vehicle through the detected signal, monitors the wheel running faults, and records and reports the faults that occur; The signal input acquisition module (1) comprises a first wheel speed sensor (4) and a second wheel speed sensor (5), wherein the first wheel speed sensor (4) and the second wheel speed sensor (5) respectively acquire a wheel speed signal of one wheel and a wheel speed signal of another wheel; The signal processing module (2) is composed of two processing mechanisms, one of which comprises a system power supply (6), a first operational amplifier (7), a first resistor (8), a second resistor (9), a third resistor (10), a fourth resistor (11), a fifth resistor (12), a sixth resistor (13), a seventh resistor (14), a first capacitor (22), a second capacitor (23), a third capacitor (24) and a first MOS transistor (28), and the other of which comprises an eighth resistor (15), a ninth resistor (16), a tenth resistor (17), an eleventh resistor (18), a twelfth resistor (19), a thirteenth resistor (20), a fourteenth resistor (21), a fourth capacitor (25), a fifth capacitor (26), a sixth capacitor (27) and a second MOS transistor (29), wherein the two processing mechanisms respectively process the received signal sign1 and generate Vpwm1 and Vadc1, and process the received signal sign2 and generate Vpwm2 and Vadc2; The signal processing module (2) generates a system power supply (6), the sixth resistor (13) and the seventh resistor (14) divide the voltage to turn on the first MOS tube (28), the thirteenth resistor (20) and the fourteenth resistor (21) divide the voltage to turn on the second MOS tube (29), at this time, sign1 flows through the first MOS tube (28) through the fourth resistor (11) for sampling, generating a sine wave waveform, sign2 flows through the second MOS tube (29) through the eleventh resistor (18) for sampling, generating a sine wave waveform, and the sampling signal Vin1 of the wheel speed sign1 and the sampling signal Vin2 of the wheel speed sign2 are obtained through the sampling part; The Vin1 signal passes through a low-pass filter formed by the second resistor (9) and the second capacitor (23) and then passes through a hysteresis comparator formed by the first operational amplifier (7), the first resistor (8), the first capacitor (22) and the third resistor (10) to generate a Vpwm1 signal which is transmitted to the MCU processing module (3); the other signal passes through a low-pass filter formed by the fifth resistor (12) and the third capacitor (24) to generate Vadc1 which is directly transmitted to the MCU processing module (3); The Vin2 signal passes through a low-pass filter formed by a ninth resistor (16) and a fifth capacitor (26) and then passes through a hysteresis comparator formed by a second operational amplifier (34), an eighth resistor (15), a fourth capacitor (25) and a tenth resistor (17) to generate a Vpwm2 signal, which is transmitted to the MCU processing module (3). The other signal passes through a low-pass filter formed by a twelfth resistor (19) and a sixth capacitor (27) to generate Vadc2, which is directly transmitted to the MCU processing module (3).

2. A commercial vehicle wheel speed signal acquisition and processing system as claimed in claim 1, characterized in that: The MCU processing module (3) is composed of a central processing unit (30), a counter (31), an A / D converter (32) and a D / A converter (33). The counter (31) generates and collects PWM. Vpwm1 and Vpwm2 are collected by the counter (31). The D / A converter (33) converts digital quantities into analog quantities. The generated reference voltage Vdac is provided to the first operational amplifier (7) as a reference voltage. The A / D converter (32) converts analog quantities into digital quantities. The A / D converter (32) reads the data of Vadc1 and Vadc2.

3. A commercial vehicle wheel speed signal acquisition and processing system as claimed in claim 1, characterized in that: After the vehicle system is powered on, the entire system is initialized. After the initialization is completed, the entire circuit system is in a waiting state. The first MOS tube (28) and the second MOS tube (29) are turned on when the system power supply (6) is powered on, and are ready to collect wheel speed signals.

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