Control system for front-and-rear wheel drive vehicle

A control system for a front-and-rear wheel drive vehicle for driving one pair of respective pairs of front wheels and rear wheels by an engine and other pair of the pairs by an electric motor via a clutch of a type actuated by pressure, said control system driving the clutch by accumulator pressure increased by a pump and accumulated in an accumulator to connect and disconnect the other pair to and from and the electric motor,

• the control system comprising:
• start-detecting means for detecting a start of the engine;
• pressure-detecting means for detecting the accumulator pressure;
• clutch-actuating means for selectively engaging and disengaging the clutch by supplying the accumulator pressure to the clutch, wherein said clutch-actuating means engages the clutch when the start of the engine is detected by said start-detecting means;
• pump-driving means for driving the pump;
• and
• control means for causing said pump-driving means to drive the pump to thereby increase the accumulator pressure when the detected accumulator pressure is equal to or lower than a predetermined value.