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Diagnostic strategy for engine EGR System and engine EGR system

An engine and EGR valve technology, applied in engine components, machines/engines, charging systems, etc., can solve the problems of EGR cooler and EGR valve blockage, scrapped engine, easy condensation, etc., to accurately adjust the EGR rate, avoid engine The effect of deflagration and increased fuel consumption

Active Publication Date: 2019-12-13
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] EGR is composed of combustion exhaust gas, which is easy to condense and coke after being cooled by the cooler, which will block the EGR cooler and EGR valve
The blockage of the EGR pipeline will cause inaccurate EGR rate adjustment. Under the working condition of high load and high EGR rate, inaccurate EGR rate adjustment will easily cause serious knocking of the engine, and there is a risk of scrapping the engine.
[0006] In related technologies, there is no relatively simple system and strategy for testing the blockage of EGR cooler and EGR valve, and there is room for improvement

Method used

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  • Diagnostic strategy for engine EGR System and engine EGR system
  • Diagnostic strategy for engine EGR System and engine EGR system
  • Diagnostic strategy for engine EGR System and engine EGR system

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Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] Such as figure 1 As shown, the engine EGR system of the embodiment of the present invention is a low-pressure EGR system. The engine EGR system includes an EGR pipeline. The air intake end of the compressor 2 is connected to the air intake end of the air intake intercooler 3 through the air intake pipe, and a throttle valve 5 is set between the air intake end of the air intake intercooler 3 and the intake manifold. The exhaust gas is discharged after passing through the turbine 9, and the gas outlet end of the turbine 9 is connected with the intake end of the catalytic converter 10, and the catalytic converter 10 can be a three-way catalytic converter.

[0034] The EGR system ta...

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Abstract

The invention discloses a diagnostic strategy for an engine EGR System and the engine EGR system. The engine EGR system comprises an EGR pipeline, a differential pressure sensor and a controller, wherein an EGR cooler and an EGR valve are arranged on the EGR pipeline, and the air inlet end of the EGR valve is connected with the air outlet end of the EGR cooler; the inlet end of the differential pressure sensor is selectively in communication with one of a first point and a second point on the EGR pipeline, the first point is located at the air inlet end of the EGR cooler, the second point is located between the air outlet end of the EGR cooler and the air inlet end of the EGR valve, the outlet end of the pressure difference sensor is connected with the EGR pipeline, and a connecting pointis located at the air outlet end of the EGR valve; and the controller is in communication connection with the differential pressure sensor. According to the engine EGR system, the blockage condition detection of the EGR cooler and the EGR valve can be realized, the EGR rate can be accurately adjusted, and the problem that engine deflagration and oil consumption are increased due to inaccurate EGRrate adjustment are avoided.

Description

technical field [0001] The invention relates to the technical field of engine manufacturing, in particular to an engine EGR system and a diagnostic strategy for the engine EGR system. Background technique [0002] Environmental issues, energy crisis, stringent emission and fuel consumption regulations have brought severe challenges to the internal combustion engine industry. Reducing fuel consumption and reducing emissions are the two core issues at present. [0003] Under the above background, various car companies and research institutes have proposed that the low-pressure EGR system be applied to gasoline engines, leading the exhaust gas from the catalytic converter to the front of the compressor, and introducing the cooled exhaust gas into the cylinder to reduce the temperature and ratio of the working fluid in the cylinder. The heat ratio can reduce the pumping loss of small and medium loads. After introducing EGR under heavy loads, it can reduce the compression end te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/49F02M26/47
CPCF02M26/47F02M26/49
Inventor 崔亚彬张士伟刘义佳关松
Owner GREAT WALL MOTOR CO LTD
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