Cooling system for engine

摘要

A cooling system for an engine is provided. The cooling system includes an EGR device including an EGR passage for recirculating exhaust gas into an intake passage, an EGR valve for adjusting a flow rate of the recirculating exhaust gas, and an EGR cooler for cooling the recirculating exhaust gas, an EGR valve controller for controlling the EGR valve, coolant flow paths including a first flow path and a second flow path and where coolant circulates, a coolant pump for circulating coolant within the coolant flow paths, a flow rate control valve for adjusting a flow rate of the coolant through the second flow path, a temperature detector for detecting a coolant temperature within the first flow path, and a valve controller for adjusting a flow rate control valve opening based on the detected temperature.

主权项

1. A cooling system for an engine, comprising:
an exhaust gas recirculation (EGR) device including an EGR passage for recirculating, into an intake passage, a part of exhaust gas discharged from the engine, an EGR valve for adjusting a flow rate of the exhaust gas recirculating through the EGR passage, and an EGR cooler for cooling the exhaust gas recirculating through the EGR passage; an EGR valve controller for controlling the EGR valve; coolant flow paths including a first flow path and a second flow path and where coolant circulates, the first flow path passing through a cylinder head of the engine, the second flow path branching from the first flow path and passing through the EGR cooler; a coolant pump for circulating the coolant within the coolant flow paths; a flow rate control valve for adjusting a flow rate of the coolant through the second flow path; a temperature detector for detecting a temperature of the coolant within the first flow path; and a valve controller for adjusting an opening of the flow rate control valve based on the temperature detected by the temperature detector, wherein the valve controller fully closes the flow rate control valve in a case where the detected temperature is below a predetermined temperature threshold and the EGR valve is not opened by the EGR valve controller, the valve controller opens the flow rate control valve in one of a case where the detected temperature is below the temperature threshold and the EGR valve is opened by the EGR valve controller and a case where the detected temperature is one of the temperature threshold and a value thereabove.