Patent ID: 6533370
Filing Date: 2003-03-18
Classification: B60T

Abstract:
A vehicle brake apparatus having slip ratio calculation means for calculating a slip ratio based on vehicle body speed and wheel speed in which ABS control is executed to prevent a wheel from locking in such a manner that braking force is controlled so as to keep the slip ratio at a target slip ratio so that an excessive drop of the wheel speed from the vehicle body speed is adjusted, comprising:a braking actuator for adjusting braking force applied to a wheel; a drive circuit for generating an output current by which the braking actuator is driven, wherein the output current during ABS control is a current on which oscillating waves are superimposed so that the wheel speed changes to show oscillating waves; and wheel speed phase delay calculation means for calculating a phase delay of the oscillating waves of the wheel speed from those of the output current and detecting whether the wheel speed drops to an extent that the slip ratio exceeds the target slip ratio in use of the calculated phase delay.