| 摘要 |
A system for controlling cooling water temperature for an engine has a radiator, a cooling water passage communicating a water jacket in the engine with the radiator, and a thermostat provided in the cooling water passage. The system is provided with a bypass for bypassing the thermostat, a bypass valve provided in the bypass for closing the bypass; and a solenoid operated valve for actuating the bypass valve. Switch circuits are connected parallel to the solenoid operated valve means. The switch circuits comprises a low temperature switch responsive to low cooling water temperature to effect the operation of the solenoid operated valve for closing the bypass valve of the bypass, a high temperature switch responsive to high cooling water temperature to effect the operation of the solenoid operated valve for closing the bypass valve, a light load switch responsive to the light load operation of the engine to effect the operation of said solenoid operation valve for closing the bypass valve, and a heater switch connected to the high temperature switch in series, whereby the cooling water temperature is controlled according to the engine operation and the heater operation.
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