Method for judging cooling efficiency degradation of EGR cooler and EGR system

Abstract

The invention provides a method for judging cooling efficiency degradation of an EGR cooler and an EGR system. Changes of the cooling efficiency of the EGR cooler are judged through the high-temperature environment and the low-temperature environment where the EGR cooler is located, the degradation coefficients of the EGR cooler are judged, the NOx emission degradation coefficients are determined according to the degradation coefficients of the EGR cooler, the fuel oil injection amount or the gas inlet amount is corrected based on the NOx emission degradation coefficients to adjust original engine emission, and therefore the emission influence brought by cooling efficiency reducing of the EGR cooler is effectively controlled. The method and the EGR system are beneficial to improving product emission consistency.

Description

technical field

[0001] The present invention relates to an EGR treatment technology, in particular to a method for judging deterioration of cooling efficiency of an EGR cooler and an EGR system. Background technique

[0002] Exhaust Gas Recirculation (EGR for short) is to draw part of the exhaust gas generated by the diesel engine or gasoline engine out of the exhaust pipe, and introduce an appropriate amount of exhaust gas into the intake pipe through a control valve, such as the EGR valve, to mix with fresh air. It is an emission control technology that enters the combustion chamber to participate in combustion. Because the exhaust gas contains a large amount of CO2, CO2 cannot be burned but absorbs a large amount of heat, thereby reducing the combustion temperature of the mixture in the cylinder, thereby reducing the amount of NOx produced.

[0003] Usually, the exhaust gas discharged from the combustion chamber needs to be cooled by an EGR cooler to reduce the temperatu...

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