| 摘要 |
An internal combustion engine ( 200 ) includes a coolant pump ( 212 ) having a pump outlet ( 214 ), and a first exhaust gas recirculation (EGR) cooler ( 206 ) fluidly connected to the pump outlet ( 214 ). A crankcase ( 202 ) is fluidly connected in parallel with the EGR cooler ( 206 ) to the pump outlet ( 214 ) for receiving coolant therefrom. A cylinder head ( 204 ) is fluidly connected to the crankcase ( 202 ) for receiving coolant therefrom. A thermostat ( 232 ) is fluidly connected between the cylinder head ( 204 ) and the coolant pump ( 212 ). A valve system ( 238 ) has a first selectable position fluidly connecting the flow from the first EGR cooler ( 206 ) to the flow in the cylinder head ( 204 ), and a second selectable position fluidly connecting the flow from the first EGR cooler ( 206 ) to the thermostat ( 232 ) in bypassing relation to the cylinder head ( 204 ). Each of the first or second position is effected in response to an engine operating parameter.
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