| 摘要 |
An improved cooling system for an internal combustion engine in an automotive vehicle which utilizes recirculating liquid coolant and provides an initial engine warm-up flow circuit extending: from a coolant pump, through cooling passages in the cylinder head, through a heat exchanger used to warm a passenger compartment, and back to the pump whereby a temperature responsive flow control valve or thermostat prohibits a flow of coolant from the cylinder head to cooling passages in the engine block which provides adequate cooling of the upper surfaces of the combustion chamber which are formed by the cylinder head while promoting a relatively rapid heating of the surfaces of the engine cylinders formed by the block. After the warm-up period, the thermostat opens to permit coolant flow into a down-flow passage between the cylinder head coolant passages and the engine block coolant passages resulting in a normal engine cooling circuit extending: from the coolant pump, through the cylinder head cooling passages, then through the engine block cooling passages, through a vehicle radiator, and back to the coolant pump. The improved cooling system actively cools the upper surfaces of the combustion chamber formed by the cylinder head both during an engine warm-up period and during normal engine operation which promotes complete combustion of the fuel and inhibits knock and pre-ignition.
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