Engine thermal management system and control method thereof

Abstract

The invention discloses an engine thermal management system. The system includes an engine air intake pipe, an engine air intake main pipe, an intercooler, and a supercharger compressor. The engine thermal management system also includes an intake air temperature control bypass pipeline, an intake air amount control bypass pipeline and a temperature sensor. The two ends of the intake air temperature control bypass pipeline are respectively connected to the inlet and outlet of the intercooler. The intake air temperature control bypass pipeline is connected in parallel with the intercooler. A first bypass proportional valve is arranged on the intake air temperature control bypass pipeline. The intake air flow bypass of different flow rates can be realized by adjusting the position ratio of the first bypass proportional valve. The two ends of the intake air amount control bypass pipeline are respectively connected to the inlet and outlet of the compressor. The intake air amount control bypass pipeline is connected in parallel with the supercharger compressor. A second bypass proportional valve is arranged on the intake air amount control bypass pipeline. The intake air flow demands ofdifferent working conditions can be met by adjusting the opening degree of the second bypass proportional valve. The temperature sensor is arranged on a pipeline of the engine air intake main pipe and is used for measuring the temperature of intake air entering the engine air intake main pipe. An EUC can collect measured values of the intake air temperature.

Description

Technical field [0001] The invention relates to the technical field of engine thermal management, in particular to an engine thermal management system and a control method thereof. Background technique [0002] With the ever-increasing requirements for environmental protection and stricter emission regulations, it is the most difficult part of exhaust emission requirements to ensure that NOx specific emissions meet the limit requirements. The NOx specific emission of the new WHTC cycle diesel engine is reduced by nearly 80% compared to the traditional diesel engine. If the engineering allowance is considered, the NOx specific emission will be reduced to 0.35g / kwh or even lower. This aspect proposes a higher efficiency of the SCR catalyst. Requirements. On the other hand, the exhaust temperature of the engine should not be too low. A too low exhaust temperature will affect the rate of urea hydrolysis and SCR reaction, resulting in high urea fuel consumption ratio, urea crystalliz...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide an engine thermal management system, thereby overcoming the shortcomings of the prior art that the heat cannot be fully utilized and the negative pressure of the throttle valve is large.

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