A Method of Acquiring Wheel Rotation Signal Feature Quantities Based on Wheel Tangential Acceleration Curves

Abstract

The invention discloses a method for obtaining wheel rotation signal characteristic quantities based on wheel tangential acceleration curves. A gyroscope-free micro-inertial measurement unit is installed on the wheel hub equatorial plane of each wheel of a motor vehicle to obtain wheel tangential acceleration sensing signals. After the signal is processed by signal conditioning, digitalization and temperature compensation, the tangential acceleration curve of the wheel rotation is obtained. The data curve is obtained through attitude calculation and short-time Fourier transform feature extraction operation to obtain the characteristic quantity of the wheel rotation signal. The characteristic quantity parameter of the wheel rotation signal is obtained by Data fusion and analysis can provide a basis for the analysis and research of automobile tire brake monitoring, four-wheel alignment, wheel motion attitude and other parameter calculations, and can be used as a reference for wheel motion safety evaluation, and provide a new method for wheel rotation signal feature measurement.

Description

technical field [0001] The invention relates to a method and device for safe running state sensing and dynamic monitoring of a motor vehicle, in particular to an instantaneous state for obtaining characteristic quantities of wheel rotation signals based on wheel tangential acceleration curves. Background technique [0002] Motor vehicle operation safety status monitoring technology is the main means to ensure the safe driving of motor vehicles, and it is also the inevitable trend of the development of motor vehicle operation safety detection technology. Motor vehicle operation safety status monitoring mainly includes monitoring motor vehicle (body, wheel) motion attitude parameters, dynamic load parameters, and braking performance parameters. These parameters must be calculated and obtained based on the characteristic quantities of motor vehicle operation. Wheel rotation period, rotation frequency, rotation linear velocity, rotation angular velocity, rotation angular acceler...

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Problems solved by technology

[0003] At present, the radial acceleration curve of the wheel is mostly used to obtain the characteristic quantity of the wheel rotation signal, but the acquisition of the radial acceleration can only roughly reflect the motion state of the wheel in actual operation, and it is difficult to accurately calculate the characteristic quantity (wheel rotation period, frequency, speed, etc.) , attitude angle, etc.), and when the acceleration sensor is installed inside the tire, the sensor inside the tire will be impacted when the tire is in contact with the ground, so that the original radial acceleration curve is distorted, and it is difficult to accurately represent the actual radial direction of the wheel. Acceleration state; at the same time, due to the inaccuracy of the acceleration measurement, the calculation of the characteristic quantity of the wheel rotation signal is also inauthentic, thus affecting the analysis and calculation of the vehicle wheel motion attitude parameters, dynamic load parameters, and braking performance parameters

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