| 摘要 |
PROBLEM TO BE SOLVED: To efficiently achieve accurate control by quickly detecting a valve switch point, in a motor drive type electric valve.SOLUTION: An electric valve device 10 comprises a motor drive type electric valve 12, a motor driver 24 driving a motor, a micro computer 22 controlling the motor driver 24, and a LIN (Local Interconnect Network) transceiver 26 for communicating with an air conditioner ECU 106. The micro computer 22 starts control of the electric valve 12 on the basis of a command from the air conditioner ECU 106; makes the motor drive in a valve close direction when starting control of the electric valve 12; detects a load of the motor on the basis of drive pulses which the motor driver 24 outputs for the drive; sets, as a valve switch point of a valve part, the drive condition at the time when the detected load reaches a predetermined reference value; and by making the motor drive on the basis of the valve switch point of the valve part, performs control such that the opening of the valve part becomes an opening corresponding to a control command value.SELECTED DRAWING: Figure 1 |
