Torque calibration method and system for transmission shaft of vehicle

Abstract

The invention discloses a torque calibration method and system for a transmission shaft of a vehicle; the method comprises the steps: determining a calibration rotating speed of the vehicle, and calculating a calibration vehicle speed according to the calibration rotating speed; controlling the vehicle to accelerate to a calibrated vehicle speed at a preset gear, and then controlling the chassis dynamometer to run under the driving wheels at a preset speed; according to different gears and different accelerator pedal opening degrees, regulating the accelerator pedal tto the preset opening degree and lasts for preset time, and meanwhile recording the first driving force output by a chassis dynamometer and torque voltage output by a torque sensor of a transmission shaft of a driving wheel; calculating the driving torque according to the first driving force obtained by each accelerator pedal opening degree under each gear and the tire rolling radius of the driving wheel, serving as the first driving torque corresponding to the accelerator pedal opening degree under the gear; fitting a torque voltage-driving torque curve; and calculating the torque calibration parameters according to the torque voltage-driving torque curve. The torque calibration precision of the transmission shaft is improved.

Description

technical field [0001] The present application relates to the field of vehicle technology, and more specifically, to a method and system for calibrating the torque of a drive shaft of a vehicle. Background technique [0002] Torque sensors on automotive propshafts provide an accurate characterization of the drive torque delivered by the engine to the wheel rims. The torque sensor develops a patch-type strain bridge on the transmission shaft to sense the micro-deformation of the transmission shaft to realize the torque test. The strain voltage signal is transmitted, received, demodulated, and transmitted through the wireless radio frequency signal transmission equipment and signal processing equipment. Filtering, amplification processing, and finally output as a stable analog voltage signal (such as 0-10V). After the development of the transmission shaft torque sensor is completed, it needs to be calibrated to determine the corresponding relationship between the analog volta...

AI Technical Summary

Problems solved by technology

[0010] (1) The bench is loaded with torque based on the weight carried by the calibration arm. The peak torque of the drive shaft of a family car in the market can reach 5000N*m. Larger loads will cause deformation of the calibration arm and radial bending moment of the drive shaft, affecting Torque calibration accuracy, and this effect cannot be corrected

[0011] (2) There are obvious differences between the installation state of the torque sensor of the transmission shaft on the calibration bench and the matching state of the whole vehicle, and it is impossible to restore the influencing factors of the transmission shaft in the process of torque transmission; and the component calibration bench applies torque through static load, It is obviously different from the state where the drive shaft is rotating at high speed during the driving process of the car

[0012] (3) The calibration efficiency of the component calibration bench is low, the calibration quality is obviously affected by the operation of personnel, and the test accuracy is low

[0013] In summary, using the component calibration bench for calibration cannot restore the actual use state of the drive shaft, and the test accuracy is low

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