Wheel Tachometer

摘要

A wheel tachometer minimizes variances in the rate of revolution detected by the wheel velocity sensors of the tachometer due to assembling errors and improves the accuracy of the operation of driving force allocation. Sinusoidal wheel velocity signals vF and vR representing the rates of revolution of the front and rear wheels are produced respectively by front and rear wheel revolution sensors are subjected to wave shaping to obtain the rate of revolution of the front wheels nF and that of the rear wheels nR. When the rate of revolution of the front wheels nF and that of the rear wheels nR exceeds an initial threshold value VTHMIN, the greater one of the rates of revolution nF and nR is used to update the threshold value VTH. Thereafter, the detected rates of revolution nF and nR are used for the wheel velocities of the front and rear wheels VF and VR when they exceed the threshold value VTH and zero is used for the wheel velocities of the front and rear wheels VF and VR when they are lower than the threshold value VTH.