Engine cooling system

Abstract

The invention discloses an engine cooling system which comprises a coolant pump, an engine water jacket, a first thermostat, a radiator, and a transmission cooler, wherein a circulation loop of a coolant in the coolant pump comprises a large circulation loop going through the water jacket, the thermostat and the radiator and a small circulation loop going through the water jacket and the thermostat, the transmission cooler is connected in parallel with the small circulation loop, the first thermostat is provided with a main valve whose opening changes along with the change of the temperature of the coolant and an auxiliary valve whose opening changes along with the change of the temperature of the coolant, the main valve of the first thermostat is connected with the radiator to control the coolant flow in the large circulation loop, the auxiliary valve of the first thermostat is connected with the coolant pump to control the coolant flow in the small circulation loop, the engine cooling system further comprises a second thermostat, the second thermostat is connected in series with the transmission cooler to control the coolant flow passing by the transmission cooler, and a branch comprising the transmission cooler and the second thermostat is connected in parallel with the small circulation loop.

Description

technical field [0001] The invention relates to the technical field of engine cooling, in particular to an engine cooling system. Background technique [0002] At present, the engine cooling system of a passenger car equipped with a dual-clutch automatic transmission (DCT, Dual Clutch Transmission) is mostly connected to the engine in a series / parallel manner. figure 1 , shows a schematic structural diagram of a traditional parallel engine cooling system. The traditional parallel engine cooling system includes a radiator 2, a coolant pump 4, a first thermostat 5, a throttle valve 6, an expansion tank 3, an oil cooling 7, turbocharger 8, heater 9, gearbox cooler 10 (especially DCT cooler) and water circuit, wherein the heater 9 and gearbox cooler 10 are connected in parallel, the first thermostat 5 Installed on the liquid inlet side of the waterway. refer to figure 2 , shows a schematic structural diagram of a traditional serial engine cooling system, the traditional seri...

AI Technical Summary

Problems solved by technology

[0003] For the above two connection forms of the engine cooling system, the DCT cooler is always in a long-pass state, so that when the engine is cold started in winter, the above two connection forms will cause the coolant temperature in the system to be low, and the DCT cooling The gearbox is always in the working state, that is, the transmission gear oil is always in the state of heat dissipation, which directly leads to the temperature of the transmission gear oil being too low, the lubrication effect is poor, and it will also cause problems such as increased fuel consumption and waste of energy efficiency.

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