System and method for diagnosing engine air inflow measuring accuracy of HFM

An engine and air intake technology, applied in engine control, engine components, machines/engines, etc., can solve problems such as lack, and achieve the effect of preventing incomplete regeneration and burning

Active Publication Date: 2017-04-26
SHANDONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that lacks a matching device or a corresponding method for diagnosing the accuracy of HFM

Method used

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  • System and method for diagnosing engine air inflow measuring accuracy of HFM
  • System and method for diagnosing engine air inflow measuring accuracy of HFM

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Embodiment Construction

[0030] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0031] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0032] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0033] As intro...

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Abstract

The invention discloses a system and method for diagnosing the engine air inflow measuring accuracy of an HFM. The problem that currently, matched equipment or a corresponding method for diagnosing the air measuring accuracy of the HFM on a large commercial engine is not available is solved. The system and method can diagnose whether the air inflow measured by the HFM is accurate or not, and thus correct air flow assurance is provided for subsequent intra-cylinder fuel injection and for subsequent diesel engine post-treatment urea injection. According to the technical scheme, the system comprises an air flow meter and an air inlet pressure temperature sensor which are used for measuring the air mass flows entering the engine correspondingly and then sending the air mass flow to a controller, the air mass flows which are detected when an EGR valve is totally closed and entering the engine serve as a first measured value and a second measured value to be stored in the controller, and the controller receives the first measured value and the second measured value and obtains the deviation between the first measured value and the second measured value so as to judge whether the air mass flows, measured by the air flow meter HFM, entering the engine drift or not.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a system and method for diagnosing the accuracy of HFM to measure the intake air volume of the engine, which are suitable for large engines. Background technique [0002] For engines with National VI and higher emission requirements, the NOx and PM in the engine exhaust have been reduced to extremely low, which is inseparable from the precise control of the air system. The air system of the Euro VI diesel engine uses TV, EGR, and VGT three action mechanisms to control the intake air volume, which is the current mainstream route. The EGR (full name is Exhaust Gas Recirculation) valve is an electromechanical integration product installed on the engine to control the amount of exhaust gas recirculation fed back to the intake system. It's usually on the right side of the intake manifold, near the throttle body, and has a short metal tube leading to th...

Claims

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Application Information

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IPC IPC(8): F02M35/10F02D9/02
CPCF02D9/02F02D2009/0201F02M35/1038
Inventor 白书战李国祥朱金亮胡潇宇李婧玮
Owner SHANDONG UNIV
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