Patent ID: 7448700
Filing Date: 2008-11-11
Classification: B60T

Abstract:
1. An anti-lock brake control device in a vehicle having wheel rotational speed sensor means for detecting respective rotational speeds of left and right wheels in the same system, and brake means for adjusting respective rotations of the left and right wheels, wherein during braking of the vehicle, the brake means is controlled to switch brake pressure in wheel cylinders in at least a pressure increasing mode and a pressure reducing mode in dependence on the rotational speeds of the wheels and wherein during braking of the vehicle, the left and right wheels in the same system are placed under a selection-low control, the anti-lock brake control device comprising: lock interval judgment means for judging a difference in relative length between lock-to-lock time intervals of the left and right wheels during braking of the vehicle; and pressure increase amount calculation means for calculating respective pressure increase amounts for the left and right wheels in the pressure increasing mode during the selection-low control so that the wheel cylinders for the left and right wheels placed under the selection-low control are controlled in brake pressure independently of each other, in dependence on the difference judged by the lock interval judgment means; wherein the anti-lock brake control device controls the brake means in the pressure increasing mode so that the pressure increase amounts coincide respectively with those calculated by the pressure increase amount calculation means, wherein each of the pressure increase amounts is the sum of a base pressure increase amount and a cumulative compensation amount, and wherein the pressure increase amount calculation means includes: lock tendency judgment means for judging whether or not the wheel whose lock-to-lock time interval is relatively longer is in a lock tendency; and cumulative compensation amount calculation means for calculating the cumulative compensation amount in a pressure increasing mode next to the last pressure increasing mode by increasing the last calculated cumulative compensation amount by a predetermined amount until the wheel whose lock-to-lock time interval is relatively longer is judged by the lock tendency judgment means to be in the lock tendency; and wherein the pressure increase amount is calculated based on the cumulative compensation amount calculated by the cumulative compensation amount calculation means.