Tire Slip Detection Using Oscillation Frequency of Automotive Drivetrains

Abstract

This paper proposes a slip detection method for inverters of EV (Electric Vehicle), which drives a vehicle by one traction motor with a differencial gear and driveshafts. It is observed that the resonance frequency of the motor speed changes when tire slip happens. Based on this phenomenon, a slip detection method is developed based on abstraction of a cetrain frequency of motor speed using band-pass filter (BPF) and discrete fourier transform (DFT). According to vehicle dynamics simulation, the proposed method can avoid misdetection of slip when tire is gripping and resonance of motor speed occurs. In addition, the method is affected by transitional response of BPF and DFT, which may delay slip detection.