| 摘要 |
An internal combustion engine includes a cylinder head and a cylinder block, and is provided with a radiator. Cooling jackets are formed in the head and in the block, and separate pumps drive cooling fluid through these jackets. A sensor senses the temperature of the cooling fluid passing out from the block cooling jacket, and a controller receives a signal from this sensor. A block recirculation conduit system of high flow resistance leads from the block cooling jacket outlet to its inlet, bypassing the radiator. A main recirculation conduit system communicates at its upstream end to the outlets of both the cooling jackets, and at its downstream portion to the radiator. A radiator output conduit system leads from the radiator to the inlets of both the cooling jacket. A first control valve, controlled by the controller, controls flow through the radiator. A radiator bypass conduit system of high flow resistance leads from a downstream part of the main recirculation conduit system to the inlets of both cooling jackets, and operation of the first control valve does not cut off flow through this bypass conduit system. A second control valve controls flow from the radiator output conduit system and the radiator bypass conduit system to the block cooling jacket inlet, and is controlled by the controller.
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