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Performance monitoring and fault diagnosis method for high-pressure EGR cooler

A technology of EGR cooler and fault diagnosis, which is applied in the direction of machines/engines, charging systems, mechanical equipment, etc., and can solve problems such as low reliability

Active Publication Date: 2021-09-14
DONGFENG AUTOMOBILE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of low reliability in the prior art, and provide a high-pressure EGR cooler performance monitoring and fault diagnosis method with high reliability

Method used

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  • Performance monitoring and fault diagnosis method for high-pressure EGR cooler
  • Performance monitoring and fault diagnosis method for high-pressure EGR cooler
  • Performance monitoring and fault diagnosis method for high-pressure EGR cooler

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Embodiment

[0074] see figure 1 , figure 2 , a high-pressure EGR cooler performance monitoring and fault diagnosis method, comprising the following steps:

[0075] S1. Turn on the performance diagnosis function of the EGR cooler;

[0076] When the following diagnostic conditions are met at the same time, the EGR cooler performance diagnostic function is enabled:

[0077] (1) The engine exhaust temperature is within the calibrated exhaust temperature range to ensure that the engine is in the best working condition;

[0078] (2) The engine exhaust temperature gradient is within the calibrated exhaust temperature gradient range to ensure that the engine operating condition is relatively stable;

[0079] (3) The EGR valve flow rate is within the calibrated EGR valve flow range to ensure that the EGR valve is in working condition;

[0080] (4) The flow gradient of the EGR valve is within the range of the calibrated EGR valve flow gradient, so as to ensure that the working condition of the...

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Abstract

The invention discloses a performance monitoring and fault diagnosis method for a high-pressure EGR cooler. The performance monitoring and fault diagnosis method comprises the following steps that S1, when all diagnosis conditions are met, a signal delay counter is added, and after the diagnosis conditions are met and lasts for set time, an EGR cooler performance diagnosis function is started; S2, the cooling efficiency of the EGR cooler is monitored and diagnosed according to the ratio of the EGR cooler front and back temperature drop calculated based on the measured value of an EGR cooler outlet temperature sensor to the EGR cooler temperature drop calculated based on an EGR cooler outlet temperature model; and S3, if the performance monitoring index of the EGR cooler is lower than a diagnosis threshold value, it is judged that the performance of the EGR cooler fails, and the low cooling efficiency fault of the EGR cooler is reported, and if the performance monitoring index of the EGR cooler is higher than the diagnosis threshold value, it is judged that the performance of the EGR cooler is normal. According to the performance monitoring and fault diagnosis method, the reliability is high, the fault diagnosis robustness is enhanced, and the false alarm risk is reduced.

Description

technical field [0001] The invention relates to the technical field of OBD detection of national VI diesel engines, in particular to a performance monitoring and fault diagnosis method of a high-pressure EGR cooler, which is mainly suitable for improving diagnosis reliability. Background technique [0002] The EGR cooler is used to cool part of the exhaust gas that returns to the engine cylinder. After the exhaust gas enters the cylinder, it mixes with the fresh gas in the cylinder and enters the combustion chamber for combustion to reduce the content of nitrogen oxides in the exhaust gas of the vehicle. With the increase of the use time of the EGR cooler, impurities such as scale and carbon deposits will be generated on the surface, which will affect the cooling performance of the EGR cooler. An effective diagnosis strategy can judge whether the cooling performance of the EGR cooler meets the requirements, and the engine emissions Performance control is of great significanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/45F02M26/47F02M26/22F02M26/65
CPCF02M26/45F02M26/47F02M26/22F02M26/65
Inventor 石磊董波王善元崔巍卢勇华岳孙哲吴家坤秦忠怀杜雨停
Owner DONGFENG AUTOMOBILE COMPANY
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