Method and device for diagnosing faults of fuel injector

A technology for fault diagnosis and fuel injectors, which is applied to fuel injection devices, measuring devices, instruments, etc., can solve the problem of inaccuracy and precision, difficulty in diagnosing fuel injector faults, and insufficient rail pressure drop and other issues to achieve the effect of improving precision and accuracy

Active Publication Date: 2012-10-24
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In the process of researching the present invention, the inventors of the present invention found that the existing traditional diagnostic methods have at least the following problems: when the fuel injection quantity is used to diagnose whether the fuel injector is faulty, the change of the fuel injection quantity is usually not enough to cause Sufficiently large rail pressure drop, therefore, it is not easy to diagnose the fault condition of the injector according to the small rail pressure change, and the diagnosis results by this method are often not accurate and precise enough

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  • Method and device for diagnosing faults of fuel injector
  • Method and device for diagnosing faults of fuel injector
  • Method and device for diagnosing faults of fuel injector

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Embodiment 1

[0058] see figure 1 , which is a flowchart of a fuel injector fault diagnosis method of the present invention, the method includes the following steps:

[0059] S01: Before the injector leaves the factory, under different working conditions, the rail pressure signal of each type of engine is collected once during the power cycle, and the collected rail pressure signal is processed by discrete Fourier transform DFT to obtain The rail pressure frequency domain amplitude under different working conditions forms the basic MAP group of various engine models based on the rail pressure frequency domain amplitude under different working conditions;

[0060] In the prior art, the main factors usually affecting the change of the rail pressure signal are the engine speed and the fuel injection quantity of the fuel injector. Therefore, in this embodiment, different engine speeds and different fuel injection quantities of the fuel injector The rail pressure signal is collected under certa...

Embodiment 2

[0080] see figure 2 , which is another flow chart of a fuel injector fault diagnosis method of the present invention. Compared with Embodiment 1, it also includes a self-learning part after leaving the factory, and self-learning updates the MAP map in order to eliminate the manufacturing consistency factor of the fuel system. Impact, thereby improving the accuracy of judging comparison, the method also includes the following steps:

[0081] S01: Before the injector leaves the factory, under different working conditions, the rail pressure signal of each type of engine is collected once during the power cycle, and the collected rail pressure signal is processed by discrete Fourier transform DFT to obtain The rail pressure frequency domain amplitude under different working conditions forms the basic MAP group of various engine models based on the rail pressure frequency domain amplitude under different working conditions;

[0082] S10: Carry out self-study judgment, if the self...

Embodiment 3

[0098] see image 3 , which is another flow chart of a fuel injector fault diagnosis method of the present invention. Compared with Embodiment 1, it also includes a part for judging the current working condition, and judging the working condition at the time of collection before step A can better improve System work efficiency, eliminating invalid work, the method also includes the following steps:

[0099] S01: Before the injector leaves the factory, under different working conditions, the rail pressure signal of each type of engine is collected once during the power cycle, and the collected rail pressure signal is processed by discrete Fourier transform DFT to obtain The rail pressure frequency domain amplitude under different working conditions forms the basic MAP group of various engine models based on the rail pressure frequency domain amplitude under different working conditions;

[0100] S09: Determine whether the current working condition is any working condition in t...

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Abstract

An embodiment of the invention discloses a method and a device for diagnosing faults of a fuel injector. Before the fuel injector leaves a factory, rail pressure signals of engines of each type are collected during work cycles in advance for one time when different working conditions are met, and discrete fourier transformation (DFT) processing is performed on the collected rail pressure signals to form a basic map group of rail pressure frequency domain amplitudes of the engines of each type based on different working conditions. After the fuel injector leaves the factory, rail pressure signals of diagnosed engines are collected for one time at set intervals when a preset external environment is met, the DFT processing is performed on the collected rail pressure signals, and the processed rail pressure frequency domain amplitudes are compared with the rail pressure frequency domain amplitudes based on the same working conditions in the basic map group of the rail pressure frequency domain amplitudes. Accordingly, due to the fact that the DFT processing is performed on the collected rail pressure signals, veracity and accuracy of fault judgement of the fuel injector are remarkably improved.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a fuel injector fault diagnosis method and device. Background technique [0002] In a high-pressure common rail engine, the fuel injector is one of the core components of the common rail system, and the performance of the fuel injector directly affects the performance of the engine. In the high-pressure common rail system widely used at present, the fuel injector is prone to failures such as nozzle hole wear, blockage or needle valve sticking due to various reasons, and all failures are finally manifested through the characteristics of the fuel injection quantity. Common rail cavity pressure, referred to as rail pressure, is a key signal of the fuel system and has been widely used in current electronic control systems. The rail pressure information can reflect the amount of fuel injected by the injector. Through special processing of the transient rail pressure signal, a lot of us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M65/00
CPCY02T10/40
Inventor 岳广照桑海浪吕志华张展腾
Owner WEICHAI POWER CO LTD
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