Engine cooling system and method for operating the same
First Claim
1. An engine cooling system, comprising:
- a refrigerant circulation flow channel passing through the interior of an engine;
a refrigerant pump configured to circulate a refrigerant through the refrigerant circulation flow channel;
an electromagnetic valve arranged in the refrigerant circulation flow channel and changing a flow rate of the refrigerant passing through the engine; and
a control unit configured to start/stop the refrigerant pump and open/close the electromagnetic valve, whereinwhen the electromagnetic valve is in a closed state and the refrigerant pump is in operation, the control unit stops operation of the refrigerant pump, waits a first predetermined time period after stopping the refrigerant pump, and shuts off voltage application to the electromagnetic valve after waiting the first predetermined time period.
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Accused Products
Abstract
An engine cooling system including a refrigerant circulation flow channel passing through an engine, an electric refrigerant pump, an electromagnetic valve arranged in the refrigerant circulation flow channel, and a control unit. In the engine cooling system, when the electric refrigerant pump is stopped and the voltage application to the electromagnetic valve is shut off when the electromagnetic valve is closed and the electric refrigerant pump is in operation, the voltage application to the electromagnetic valve is shut off when a first predetermined time period has passed after the electric refrigerant pump is stopped. When the engine is intermittently stopped during warming up of the engine, current application to the electromagnetic valve is shut off while the closed state of the electromagnetic valve is maintained.
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Citations
7 Claims
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1. An engine cooling system, comprising:
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a refrigerant circulation flow channel passing through the interior of an engine; a refrigerant pump configured to circulate a refrigerant through the refrigerant circulation flow channel; an electromagnetic valve arranged in the refrigerant circulation flow channel and changing a flow rate of the refrigerant passing through the engine; and a control unit configured to start/stop the refrigerant pump and open/close the electromagnetic valve, wherein when the electromagnetic valve is in a closed state and the refrigerant pump is in operation, the control unit stops operation of the refrigerant pump, waits a first predetermined time period after stopping the refrigerant pump, and shuts off voltage application to the electromagnetic valve after waiting the first predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating an engine cooling system, the engine cooling system including a refrigerant circulation flow channel passing through the interior of an engine, a refrigerant pump configured to circulate a refrigerant through the refrigerant circulation flow channel, and an electromagnetic valve arranged in the refrigerant circulation flow channel and changing a flow rate of the refrigerant passing through the engine, the method of operating the engine cooling system comprising:
when the electromagnetic valve is in a closed state and the refrigerant pump is in operation, stopping operation of the refrigerant pump, waiting a first predetermined time period after stopping the refrigerant pump, and shutting off voltage application to the electromagnetic valve after waiting the first predetermined time period.
Specification