CONTROL SYSTEM AND CONTROL METHOD HAVING TRANSMISSION CONTROL UNIT FOR CONTROLLING HYDRAULIC CLUTCH ACTUATOR OF AUTOMATIC TRANSMISSION BY OPERATING SOLENOID VALVE

摘要

PURPOSE: A control system and a control method are provided to control engagement or disengagement of the clutch accurately, and to transmit power efficiently by detecting pressure in the clutch actuator and controlling the closed loop without additional sensors. CONSTITUTION: A control system(10) for controlling shifting of an automatic transmission is composed of a clutch(22) transmitting torque between a first rotating member and a second rotating member of the automatic transmission, a hydraulic actuator connected to operate the clutch, a pump(14) supplying the supply source of compressed fluid, an electric pressure bleed valve(12) regulating pressure of fluid to the actuator by containing compressed fluid from the pump and decreasing pressure of the pump, a transmission control unit(26) applying the electric signal of the valve, and a pressure sensor(24) detecting pressure supplied to the actuator by the valve and supplying the electric signal for indicating pressure to the transmission control unit.