Control valve

Abstract

Provided is a control valve that hardly generates noise from vibration applied thereto, while achieving compactization and power consumption saving of the valve. The valve is incorporated in a coolant circulatory passageway for circulating coolant between an engine and a heat exchanger via a pump. The valve includes a main body having a coolant channel and a valve seat, a valve body movable between a position away from the valve seat and a position in, contact with the valve seat, and a solenoid configured to cause the valve body to be adhered to the valve seat with a magnetic force generated in response to supply of electric power thereto. The control valve is configured such that the power supply to the solenoid is started when an ignition key of the engine is under its ON state and the pump is stopped.

1 . A control valve incorporated in a coolant circulatory passageway for circulating coolant between an engine and a heat exchanger via a pump, the control valve comprising:
 a main body having a coolant channel and a valve seat;   a valve body movable between a position away from the valve seat and a position in contact with the valve seat; and   a solenoid configured to cause the valve body to be adhered to the valve seat with a magnetic force generated in response to supply of electric power thereto;   wherein the power supply to the solenoid is started when an ignition key of the engine is under its ON state and the pump is stopped.   
     
     
         2 . A control valve according to  claim 1 , wherein the control valve is mounted on an engine of a hybrid vehicle, and the electric power is supplied to the solenoid in a motor-driven run mode of the vehicle with the engine being stopped. 
     
     
         3 . A control valve according to  claim 1 , wherein the control valve is mounted on an engine having the pump which allows electrical or mechanical change of coolant communication/non-communication state, and
 the electric power is supplied to the solenoid when the temperature of the engine is equal to or lower than a first predetermined temperature and the engine is being operated with the pump being stopped.   
     
     
         4 . A control valve according to  claim 1 , wherein the coolant circulatory passageway for circulation inside the engine is branched into a cylinder head coolant circulatory passageway for circulating the coolant inside a cylinder head and a cylinder block coolant circulatory passageway for circulating the coolant inside a cylinder block;
 the control valve is incorporated in the cylinder block coolant circulatory passage and includes a pump which allows electrical or mechanical change of coolant communication/non-communication state, and   the electric power is supplied to the solenoid when the temperature of the engine is equal to or lower than a second predetermined temperature and the engine is being operated with the pump too being operated.   
     
     
         5 . A control valve according to  claim 1 , further comprising an urging member configured to generate an urging force that allows the valve body to leave the valve seat when the pressure of the pump is applied to the valve body and that causes the valve body to be seated on the valve seat when the pressure of the pump is not applied to the valve body. 
     
     
         6 . A control valve comprising:
 a main body having a coolant channel and a valve seat;   a valve body movable between a position away from the valve seat and a position in contact with the valve seat; and   a solenoid configured to cause the valve body to be adhered to the valve seat with a magnetic force generated in response to supply of electric power thereto;   wherein the main body, the valve body and the solenoid are incorporated in a coolant circulatory passageway for circulating coolant between an engine mounted on a vehicle and a heat exchanger via a pump; and   supply of electric power to the solenoid is controlled by a control circuit such that the control circuit starts the supply of electric power to the solenoid when the circuit determines occurrence of vibration in the vehicle.