Integrated Detection Method for Lateral Slip Between Wheels and Axles of Automobiles Based on Dual Grating Displacement Sensing
The detection results of side slip between wheels and axles of intelligent vehicles are one of the important indicators for measuring vehicle safety,and have always been a difficulty in the field of mechanical measurement.After analyzing the mechanism of wheel to axle side slip and axle to axle side slip,this article designs an integrated detection method for automobile wheel to axle side slip based on a dual plate split motion side slip detection platform,combined with computer technology and dual grating displacement sensing technology.This method installs two types of gratings,transmission type and reflection type,on the differential plate of the equal arm axis sliding plate translation mechanism.The grating sensors are used to scan these grating lines,and then interference signals containing phase changes are obtained through derivative splitting and combining.The relative displacement of the grating is measured,and the phase of the reflected diffraction beam will also change accordingly,which corresponds to the phase change.Using the positive correlation between diffraction level and distance,the magnitude of lateral slip between wheels and axles is calculated.The test results show that this method can effectively collect vehicle sideslip signals,the output signal results are in the range of-0.60～+0.60 V,and the signal transmission is stable and continuous,without fluctuation and interruption.This method can monitor the lateral slip between wheels and between axles of vehicles in different driving states such as straight and turning.The repeatability error index values of the test results are lower than 0.1 m/km,indicating that this method meets the calibration standards.
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