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

A technology of EGR cooler and cooling efficiency, applied in the field of EGR treatment, can solve the problems of EGR cooler aging, affecting EGR cooler efficiency, EGR cooler efficiency decline, etc., and achieve the effect of improving emission consistency

Active Publication Date: 2017-06-13
WEICHAI POWER CO LTD
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  • Abstract
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Problems solved by technology

However, the efficiency of the EGR cooler will be affected by the operation of the EGR cooler at too high temperature or too low temperature. Therefore, the EGR cooler will work under high temperature and low temperature working environment, which will lead to a decrease in the efficiency of the EGR cooler, and then make the EGR cooler aging, thus Affects NOx emissions, which has a greater impact on engine emission consistency

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

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Embodiment Construction

[0024] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0025] The following will refer to figure 1 An engine-integrated EGR system according to an embodiment of the present invention will be described. Such as figure 1 As shown, the EGR system at least includes an EGR cooler 40 , a temperature sensor 50 and an EGR valve 60 . In addition, the EGR system also includes an electronic control unit configured with a time memory. The time memory is based on the temperature measured by the te...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/49F02M26/47F02M26/33
Inventor 吕志华张朝阳綦宗才仲昆李耀
Owner WEICHAI POWER CO LTD
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