Engine cooling system

The invention provides an engine cooling system which comprises a cooling device, a radiator and a valve device, the cooling device comprises a first cooler and a second cooler, the first cooler is constructed to form an intercooler of an engine, and the second cooler is constructed to dissipate heat of an EGR device of the engine; the valve device comprises a first valve and a second valve, and the first valve is used for adjusting the flow of cooling media flowing out of the first cooler and the second cooler so as to change the temperature of pressurized air and low-pressure waste gas entering an air cylinder of the engine. The communication states of the first liquid inlet and the second liquid inlet of the second valve can be adjusted so as to change the temperature of the cooling medium flowing out of the first valve. According to the engine cooling system, the lower exhaust gas temperature can be provided, and the power and torque of the engine at the low rotating speed are improved. 本发明提供一种发动机冷却系统，包括冷