Patent ID: 7666110

Claim:
A control system of a power transmission mechanism, in which a transmission torque capacity between transmission members varies according to a pressure to be applied to said transmission members, in which a torque according to the transmission torque capacity is transmitted between a prime mover and a drive wheel, and in which the pressure to be applied to said transmission members is controlled on the basis of a slip condition between said transmission members as accompanies the lowering of said pressure, comprising: decision means for deciding whether or not a predetermined prerequisite condition for lowering the pressure is satisfied, pressure lowering means for lowering said pressure by a preset value when the decision means decides that the prerequisite condition is satisfied; and pressure setting means for setting said pressure to a value obtained by adding a pressure corresponding to the road surface input to a lowered minimum value of said pressure, in case the prerequisite condition is unsatisfied during lowering the pressure and a control of lowering said pressure by the preset value using said pressure lowering means is thereby stopped without detecting the slip between said transmission members.