| 摘要 |
PURPOSE:To surely prevent an unsatisfied condition increased with temperature of cooling water in a radiator after a car is stopped, by constituting a fan motor control circuit to operate for a prescribed time even after an ignition switch is turned off. CONSTITUTION:If an ignition switch SW is turned off from its on-state, a capacitor CT in a time limit circuit TE is not charged by a battery E, and an electric charge in the CT is started to be discharged through a resistor RT. In this way, if charge voltage of the capacitor CT is decreased to a prescribed level, an amplifier OA1 is not generated with output to turn off an output transistor Q2, accordingly a power feed control transistor Q1 is also turned off to stop a feed of power to a motor control circuit MC. In this way, after the switch SW is turned off, a time of power feed to the motor control circuit MC is extended by a prescribed time determined by the time limit circuit TE, and an engine can be continuously cooled effectively by operation of a fan motor M. |
