Patent ID: 8678151

Claim:
A clutch control device for controlling a clutch installed between an engine and a transmission in a power transmission device for a vehicle, said clutch control device comprising: a clutch actuator driven by a working fluid; a stroke sensor for detecting a movement of said clutch actuator; a flow rate control valve for controlling an amount of the working fluid in said clutch actuator; and a flow rate control valve control device for controlling a position of a valve body of said flow rate control valve responsive to a detection signal from said stroke sensor, wherein said flow rate control valve is connected to a communication passage communicated with said clutch actuator, to a pressure source passage communicated with a working fluid pressure source, and to a discharge passage for discharging the working fluid from said clutch actuator, and said flow rate control valve is provided with a valve actuator for operating said valve body, such that at a neutral position of said valve body, said communication flow passage is cut off from said pressure source passage and said discharge passage, wherein said flow rate control valve control device is provided with a neutral position learning device for learning a central point of said valve body at the neutral position, wherein said neutral position learning device, at a time of learning said central point at the neutral position, executes an operation for decreasing the movement of the clutch actuator, and thereafter, executes an operation for increasing the movement of the clutch actuator, such that said neutral position learning device executes said learning said central point at the neutral position while the movement of the clutch actuator is changing, wherein said neutral position learning device, while decreasing the movement of the clutch actuator, detects, as a first operation amount, an operation amount of said valve actuator at a moment when a rate of change in the movement of the clutch actuator detected by said stroke sensor has reached a negative predetermined value, then, said neutral position learning device, while increasing the movement of the clutch actuator, detects, as a second operation amount, an operation amount of said valve actuator at a moment when a rate of change in the movement of the clutch actuator has reached a rate of change which is equal to an absolute value of said negative predetermined value, and wherein said neutral position learning device decides a value obtained by averaging said first operation amount and said second operation amount to be the central point at the neutral position.