A high-sensitivity wheel speed sensor system and control method

Abstract

This invention discloses a high-sensitivity wheel speed sensor system and control method, belonging to the field of braking control technology. It includes an ESC controller and an EPB controller. The ESC controller includes an ABS and a yawrate sensor. The ESC controller controls the vehicle's dynamic stability, while the ABS prevents wheel lock-up. The yawrate sensor, integrated into the ESC controller, collects the vehicle's longitudinal acceleration, lateral acceleration, and yaw rate, and transmits this information to the ESC controller to assist in determining the vehicle's status. The EPB controller can park the vehicle after it stops. The ESC controller and EPB controller are connected via a CAN signal. The ESC controller transmits wheel speed pulse signals to the EPB controller via CAN, and the ESC controller collects yawrate sensor signals in real time via hardwired connections. This invention processes the vehicle speed output from the ESC controller and adds a yawrate threshold judgment, improving production line throughput and avoiding user complaints.

Description

Technical Field

[0001] This invention belongs to the field of braking control technology, specifically a high-sensitivity wheel speed sensor system and control method. Background Technology

[0002] As automobiles become increasingly intelligent, the demands on chips also rise. To improve accuracy, chip detection sensitivity is increased. However, in some cases, this increased sensitivity can cause controllers to misinterpret input information, leading to errors or erroneous function triggers. For example, while wheel speed sensor chips offer improved detection accuracy and more precise wheel speed identification, even slight vehicle body movements can generate wheel speed pulse signals. If this speed information is directly fed back to the instrument panel, the displayed speed will appear to fluctuate continuously. Furthermore, on the automotive production line, when a vehicle is first powered on, the ABS performs a self-check. During this self-check, operators may be assembling the vehicle, and due to wheel speed sensitivity, sometimes a single wheel may be detected. According to the ABS control logic, the presence of wheel speed in a single wheel poses a risk of wheel lockup, requiring ABS intervention. However, since the ABS self-check is not yet complete and the system is not yet functional, the ESC (Electronic Control System) will report an ABS fault. In other situations, such as when someone moves around on the vehicle after the EPB clamps, the wheel speed will input a pulse signal. When the EPB detects that the wheel speed pulse is greater than the threshold, it will trigger the slope re-clamping function. After multiple slope re-clampings, the EPB clamping current will be too high and an error will be reported.

[0003] The above errors will reduce the production line throughput, affect the production cycle, and cause customer complaints. Summary of the Invention

[0004] To address the above problems, this invention provides a high-sensitivity wheel speed sensor system and control method, including an ESC controller and an EPB controller. The ESC controller includes an ABS and a yawrate sensor. The ESC controller controls the vehicle's dynamic stability, while the ABS prevents wheel lock-up. The yawrate sensor, integrated into the ESC controller, collects the vehicle's longitudinal acceleration, lateral acceleration, and yaw rate, and transmits this information to the ESC controller to assist in determining the vehicle's status. The EPB controller can park the vehicle after it stops. The ESC controller and EPB controller are connected via a CAN signal. The ESC controller transmits wheel speed pulse signals to the EPB controller via CAN, and the ESC controller collects yawrate sensor signals in real time via hardwired connections. This invention processes the vehicle speed output from the ESC controller; if the vehicle speed is less than 1, it outputs 0, avoiding repeated jumps between 0 and 1 on the instrument panel. A yawrate threshold is added; when the wheel speed is greater than the threshold but the yawrate is not, the vehicle is considered stationary, and the ABS function is normal. When both wheel speed and yawrate are greater than the threshold, a system fault is reported. The sloping re-clamping function eliminates the need for multiple staged clamping. When sloping occurs, the EPB clamps with maximum force once, and then disables the sloping re-clamping function, preventing repeated triggering of errors. These improvements increase production line throughput and reduce customer complaints.

[0005] The technical solution of this invention is as follows: a high-sensitivity wheel speed sensor system, comprising: an ESC controller and an EPB controller; the ESC controller includes ABS and yawrate sensors;

[0006] The ESC controller controls the vehicle's dynamic stability, while ABS prevents wheel lock-up. The yaw rate sensor, integrated into the ESC controller, collects the vehicle's longitudinal acceleration, lateral acceleration, and yaw rate, and transmits this information to the ESC controller to help it determine the vehicle's status. The EPB controller can hold the vehicle in place after it has come to a stop.

[0007] The ESC controller and the EPB controller are connected via CAN signal. The ESC controller transmits the wheel speed pulse signal to the EPB controller via CAN, and the ESC controller acquires the yawrate sensor signal in real time via hardwire.

[0008] A control method for a high-sensitivity wheel speed sensor system includes the following steps:

[0009] S1 Vehicle Speed ​​Output Control: The ESC controller calculates the vehicle speed. When the vehicle speed is less than the first speed, the ESC controller outputs a vehicle speed of 0. When the vehicle speed is greater than or equal to the first speed, the ESC controller outputs the vehicle speed according to the actual value.

[0010] S2 ABS Control: The vehicle is powered on; the ESC controller performs logical judgment, and the ABS performs a self-check, comparing wheel speed with the first threshold; if wheel speed ≤ the first threshold, the ABS function is normal; if wheel speed > the first threshold, the ESC controller compares the yawrate integral with the first threshold; if the yawrate integral ≤ the second threshold, the ABS function is normal; if the yawrate integral > the second threshold, the ESC controller reports a system fault.

[0011] S3 EPB Slope Re-clamping Control: The EPB controller determines whether the EPB is in a clamping state; if the EPB is not clamped, the slope re-clamping function is turned off; if the EPB is clamped, the slope re-clamping function is turned on.

[0012] After the S4 EPB controller activates the ramp re-clamping function, it determines the wheel speed pulse count and the third threshold value within the first time. If the pulse count is less than or equal to the third threshold value, the ramp re-clamping function is maintained. If the pulse count is greater than the third threshold value, the EPB clamps with the maximum clamping force and disables the ramp re-clamping function.

[0013] Furthermore, in step S1, the first speed is 1 km / h.

[0014] Furthermore, in step S2, the first threshold is 1.08 km / h.

[0015] Furthermore, in step S2, the second threshold is 0.5 km / h.

[0016] Furthermore, in step S4, the first time interval is 100-200ms.

[0017] Furthermore, in step S4, the third threshold is three wheel speed pulses.

[0018] The beneficial effects of this invention are as follows:

[0019] It improved the production line throughput, avoided repeated error triggering of the EPB function, and prevented user complaints. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the braking control system of the present invention.

[0021] Figure 2 This is the ABS logic diagram of the present invention.

[0022] Figure 3 This is the logic diagram of the EPB slope re-clamping of the present invention. Detailed Implementation

[0023] It should be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; a connection can be a mechanical connection or an electrical connection; a link can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] ABS: Anti-lock Braking System

[0026] EPB: Electronic Parking Brake

[0027] ESC: Electronic Stability Control System

[0028] yawrate: inertial sensor

[0029] A high-sensitivity wheel speed sensor system includes: an ESC controller and an EPB controller; the ESC controller includes ABS and yawrate sensors, and the ESC controller and EPB controller are independent controllers installed on the vehicle;

[0030] The ESC controller is mainly responsible for the vehicle's dynamic stability control, while the ABS mainly controls the vehicle to prevent wheel lock-up. The yaw rate sensor is integrated into the ESC controller to collect the vehicle's longitudinal acceleration, lateral acceleration, and yaw rate, and transmits this information to the ESC controller to assist the ESC controller in judging the vehicle's status. The EPB controller is mainly responsible for parking the vehicle after it stops. In order to prevent the vehicle from rolling on a slope after stopping, a roll-off and re-clamping function is set up.

[0031] The ESC controller and EPB controller are connected via CAN signal. The ESC controller transmits wheel speed pulse signals to the EPB controller via CAN. After clamping, the EPB controller maintains or disables the slippage re-clamping function by determining whether the number of wheel speed pulses exceeds a threshold within a certain time. The ESC controller has an ABS (Anti-lock Braking System) and a yawrate sensor integrated into it. The ESC controller acquires yawrate sensor signals in real time via hardwire. By acquiring wheel speed and yawrate signals, the ESC controller determines whether the ABS is functioning correctly.

[0032] A control method for a high-sensitivity wheel speed sensor system includes the following steps:

[0033] S1 vehicle speed output control:

[0034] The ESC controller calculates the vehicle speed. When the vehicle speed is less than the first speed, the ESC controller outputs a vehicle speed of 0.

[0035] When the vehicle speed is greater than or equal to the first speed, the ESC controller outputs the vehicle speed according to the actual value.

[0036] S2 ABS control:

[0037] The vehicle is powered on; the ESC controller performs logical judgments, the ABS performs self-checks, and the wheel speed is compared with the first threshold value.

[0038] If the wheel speed is less than or equal to the first threshold, the ABS function is normal.

[0039] If the wheel speed is greater than the first threshold, the ESC controller compares the yawrate integral with the first threshold.

[0040] If the yawrate integral is less than or equal to the second threshold, then the ABS function is normal.

[0041] If the yawrate integral exceeds the second threshold, the ESC controller will report a system fault.

[0042] S3 EPB Slope Re-clamping Control:

[0043] The EPB controller determines whether the EPB is in a clamped state.

[0044] If the EPB is not clamped, the slope re-clamping function will be turned off;

[0045] If the EPB is clamped, the slope re-clamping function will be activated;

[0046] After the S4 EPB controller activates the slippage and re-clamping function, it determines the wheel speed pulse count and the third threshold value within the first time.

[0047] If the number of pulses is less than or equal to the third threshold, maintain the slope clamping function;

[0048] If the number of pulses exceeds the third threshold, the EPB clamps with the maximum clamping force and disables the ramp re-clamping function.

[0049] Furthermore, in step S1, the first speed is 1 km / h.

[0050] Furthermore, in step S2, the first threshold is 1.08 km / h.

[0051] Furthermore, in step S2, the second threshold is 0.5 km / h.

[0052] Furthermore, in step S4, the first time interval is 100-200ms.

[0053] Furthermore, in step S4, the third threshold is three wheel speed pulses.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A control method for a high-sensitivity wheel speed sensor system, characterized in that, Includes the following steps: S1 Vehicle Speed ​​Output Control: The ESC controller calculates the vehicle speed. When the vehicle speed is less than the first speed, the ESC controller outputs a vehicle speed of 0. When the vehicle speed is greater than or equal to the first speed, the ESC controller outputs the vehicle speed according to the actual value. S2 ABS Control: The vehicle is powered on; the ESC controller performs logical judgment, and the ABS performs self-check, comparing wheel speed with the first threshold; if wheel speed ≤ the first threshold, the ABS function is normal; if wheel speed > the first threshold, the ESC controller judges the yawrate integral with the first threshold; if yawrate integral ≤ the second threshold, the ABS function is normal; if yawrate integral > the second threshold, the ESC controller reports a system fault. S3 EPB Slope Re-clamping Control: The EPB controller determines whether the EPB is in a clamping state; if the EPB is not clamped, the slope re-clamping function is turned off; if the EPB is clamped, the slope re-clamping function is turned on. After the S4 EPB controller activates the ramp re-clamping function, it determines the wheel speed pulse count and the third threshold value within the first time. If the pulse count is less than or equal to the third threshold value, the ramp re-clamping function is maintained. If the pulse count is greater than the third threshold value, the EPB clamps with the maximum clamping force and the ramp re-clamping function is deactivated. In step S1, the first speed is 1 km / h; In step S2, the first threshold is 1.08 km / h and the second threshold is 0.5 km / h; In step S4, the first time interval is 100-200ms, and the third threshold is three wheel speed pulses.

2. The control method for the high-sensitivity wheel speed sensor system according to claim 1, characterized in that, Also includes: ESC controller and EPB controller; ESC controller includes ABS and yawrate sensors; The ESC controller controls the vehicle's dynamic stability, while ABS prevents wheel lock-up. The yaw rate sensor, integrated into the ESC controller, collects the vehicle's longitudinal acceleration, lateral acceleration, and yaw rate, and transmits this information to the ESC controller to help it determine the vehicle's status. The EPB controller can hold the vehicle in place after it has come to a stop. The ESC controller and the EPB controller are connected via CAN signal. The ESC controller transmits the wheel speed pulse signal to the EPB controller via CAN, and the ESC controller acquires the yawrate sensor signal in real time via hardwire.

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