Vehicle cooling device

摘要

A vehicle cooling device includes a pump, circulation paths connected to the pump for circulating coolant between a cooling object and a heat exchanger, a solenoid valve for opening and closing at least one of the circulation paths, and a control unit for controlling pump operation. The solenoid valve includes a valve body movable between a position separated from a valve seat and a position abutting the valve seat, the valve body being held in abutment with the valve seat, and a solenoid maintaining the abutment when energized. The valve body allows coolant fluid pressure to move the valve body separate from the valve seat when the solenoid is not energized and the pump is in operation, and the control unit performs controlling to stop the pump and start solenoid energization when conditions are ready for stopping coolant circulation through the circulation path in which the solenoid valve is disposed.

主权项

1. A vehicle cooling device, comprising:
a pump; a plurality of circulation paths connected to the pump for circulating coolant between a vehicle's object of cooling and a heat exchanger, the vehicle's object of cooling comprising a cylinder head and an engine block; a solenoid valve disposed in one of the plurality of circulation paths that circulates the coolant between the engine block and the heat exchanger, the solenoid valve being configured to open and close the at least one of the plurality of circulation paths; a control unit for controlling the operation of the pump and the solenoid; wherein the solenoid valve includes a valve body that is movable between a position in which the valve body is separated from a valve seat and a position in which the valve body is in abutment with the valve seat, and a solenoid configured to maintain the abutment between the valve body and the valve seat due to energization of the solenoid; wherein the valve body is provided in a manner that allows the fluid pressure of the coolant to move the valve body to the position in which the valve body is separated from the valve seat when the solenoid is not energized and the pump is in operation; wherein the control unit is configured to stop the pump and to start energization of the solenoid when determining that conditions are ready for stopping the circulation of the coolant through the circulation path in which the solenoid valve is disposed; wherein when the pump is in operation and the solenoid is energized to maintain the solenoid valve in a closed state, the coolant is supplied to the cylinder head and the coolant is not supplied to the engine block; wherein the solenoid comprises a solenoid body made of a magnetic material and a circulation passage passing through the solenoid body, and arranged concentrically with the solenoid body, the circulation passage communicating with the one of the plurality of circulation paths that circulates the coolant between the engine block and the heat exchanger; wherein the valve seat is provided on the solenoid body; wherein the valve body of the solenoid is made of a magnetic material so that the valve body is pulled to the valve seat when the solenoid is energized; and wherein an end face of the valve seat is a planar surface that is perpendicular to a direction of a fluid pressure of the coolant acting on the valve body.