Cooling system for engine

Abstract

The invention relates to a cooling system for an engine. The cooling system comprises a high-temperature circulating cooling system and a low-temperature circulating cooling system, wherein the high-temperature circulating cooling system comprises three cooling liquid flow paths, namely, a large circulation cooling liquid flow path, a small circulation cooling liquid flow path and a delayed circulation cooling liquid flow path. According to the cooling system, an electronic control auxiliary water pump is added for the high-temperature circulating cooling system, and delayed circulation is achieved, so that the heat supply demands of all the parts after engine halt can be better met, and the flow direction problem of cooling circulation among different parts is solved.

Description

technical field [0001] The invention belongs to the field of automobile cooling systems, in particular to an engine cooling system. Background technique [0002] Governments of various countries have promulgated more and more stringent standards for engine fuel consumption. For example, it is stipulated that automobile OEMs will continue to reduce fuel consumption to 5.0L / 100km in 2020; One technology is the supercharged miniaturization of the engine + hybrid technology. [0003] In response to local government regulations, a more innovative engine matching system must be found to accomplish this goal. Because on the premise of not losing power, it is basically an impossible task to reduce fuel consumption by 30% on the current basis. Therefore, it is proposed to use a hybrid power system + electronic supercharging on the engine, and achieve the requirement of reducing fuel consumption through weak mixing and miniaturization of engine supercharging. Due to the extremely c...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the prior art is that there is only one main circuit in the cooling state of the engine in a large cycle

With the continuous promotion of engine fuel-saving technology, the number of integrated components on the engine is gradually increasing, such as intercooler, BSG, electronic supercharger, electronic water pump, etc. These new integrated components also need to be cooled, but , the required cooling temperature, flow rate and control logic are completely different from those of the engine block and cylinder head; in addition, with the application of start-stop technology, for example, the HyBoost engine developed by Ricardo has a fast start-stop function to reduce Engine oil consumption level, simply relying on the on-off mechanical water pump cannot meet the heating demand after the engine stops, especially in areas with low temperature, this defect is particularly prominent

Therefore, the traditional cooling system control loop can no longer meet the application of new technology

[0007] In addition, the traditional mechanical thermostat responds slowly, and its opening and closing are determined by the water temperature of the engine, which is not conducive to the warm-up of the engine and the rapid cooling of the water temperature

[0008] In contrast to water cooling, there is still a technical solution for cooling the intercooler, BSG, and electronic supercharger by air cooling in the prior art. High requirements, difficult layout, high risk of thermal balance, generally need to be improved repeatedly to achieve the desired effect

In addition, the use environment of the whole vehicle is changeable, which makes it difficult for the air cooling system to meet the needs of various working conditions in various use environments; in addition, with the application of start-stop technology, the mechanical water pump cannot meet the heating demand after the engine stops, especially when the temperature This deficiency is particularly pronounced in lower regions

[0009] As a fast start-stop engine, after the engine stops, the mechanical water pump stops working, which cannot meet the heating demand of the cab after the engine stops, especially in areas with low temperature, especially in urban working conditions, so the traditional cooling control Loops can no longer meet the application of new technologies

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