Patent ID: 7458650
Filing Date: 2008-12-02
Classification: B60K,B60L,B60T,B60W,F16H,Y02T

Abstract:
1. A regenerative braking system comprising: a generator that is connected with a wheel set, the generator being capable of applying regenerative brake torque to the wheel set by generating electricity; a regenerative braking control means that controls a regenerative braking amount of the generator based on at least a demand brake force amount; an actual wheel speed variation calculating means that calculates an actual wheel speed variation between an actual outer wheel speed of an outer wheel of steerable wheels and an actual inner wheel speed of at least one wheel of a front wheel set and a rear wheel set; an estimated road-grip correspondent wheel speed variation calculating means that estimates an estimated road-grip correspondent wheel speed variation corresponding to an outer-to-inner wheel speed variation between outer wheel speed and inner wheel speed of the steerable wheels with road grip; a steer characteristic judging means that judges that an estimated understeer amount of a steer characteristic becomes stronger as a numerical value of an estimated-to-actual wheel speed variation between the estimated road-grip correspondent wheel speed variation and the actual wheel speed variation becomes larger; and a regenerative braking amount compensating means that compensates the regenerative braking amount so that the regenerative braking amount decreases more as the estimated understeer amount becomes stronger.