Patent ID: 6493623
Filing Date: 2002-12-10
Classification: B60K,B60W

Abstract:
A driving force control system for a four-wheel drive vehicle including a pair of front wheels, and a pair of rear wheels, one of said pairs being main drive wheels, and the other of said pairs being auxiliary drive wheels, the driving force control system controlling engagement forces of clutches to thereby control driving forces distributed to said auxiliary drive wheels,the driving force control system comprising: driving force control means for controlling said engagement forces of said clutches such that said driving forces are distributed to said auxiliary drive wheels, on condition that there is satisfied at least one of the following conditions that a wheel speed of one of said main drive wheels is equal to or higher than a first predetermined speed, and at the same time, a wheel speed of the other of said main drive wheels is lower than said first predetermined speed, and that an average wheel speed of said main drive wheels is equal to or higher than a second predetermined speed, and at the same time, an average wheel speed of said auxiliary drive wheels is lower than said second predetermined speed, until said average wheel speed of said auxiliary drive wheels reaches a third predetermined speed equal to or higher than said second predetermined speed.