The invention discloses an engine cooling
system. The engine cooling
system comprises a
thermostat, a mechanical water pump, a radiator, a
water jacket of a cylinder body, a
water jacket of a
cylinder head, and a warm air pipeline subsystem; the mechanical water pump, the
water jacket of a cylinder body and a radiator Forming a complete water circuit, the
thermostat is set between the mechanical water pump and the radiator, and the
thermostat is used to control the on-off between the mechanical water pump and the radiator; the water jacket of the cylinder body is connected with the water jacket of the
cylinder head, and the water jacket of the
cylinder head The water outlet of the cylinder head is connected with the water inlet of the warm air pipeline subsystem, and the water outlet of the warm air pipeline subsystem is connected with the water inlet of the mechanical water pump; a first stop valve is set between the cylinder head water jacket and the warm air pipeline subsystem. The first
cut-off valve is used to control the on-off connection between the water jacket of the cylinder head and the heating air pipeline subsystem. In the engine cooling
system of the present invention, when the engine is low temperature, the radiator and the warm air pipeline subsystem do not participate in circulation, and the number of cooling devices is reduced, so that the engine can reach the normal
operating temperature as soon as possible.