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Engine fire detection method and detection device thereof

A detection method and technology of a detection device are applied in the direction of internal combustion engine testing and other directions, which can solve the problems of low detection accuracy and difficulty in achieving synchronization, and achieve the effects of simple signal processing process, high misfire detection, and reasonable design.

Inactive Publication Date: 2010-12-08
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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Problems solved by technology

Although this solution uses the exhaust pressure fluctuation signal for detection, it is difficult to synchronize the detected signal with the built-in standard signal, the detection accuracy is not high, and it is prone to misjudgment

Method used

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  • Engine fire detection method and detection device thereof
  • Engine fire detection method and detection device thereof

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Embodiment Construction

[0021] Such as figure 1 As shown, the engine misfire detection method uses the pressure sensor 2 arranged on the engine exhaust system 1 to collect the real-time exhaust pressure wave signal of the engine exhaust system 1 . More specifically, the pressure sensor 2 is provided in the front exhaust pipe of the engine exhaust system 1 . The collected real-time exhaust pressure wave signal is input to the central processing unit 3, and the central processing unit 3 compares the peak-to-peak value of the real-time exhaust pressure wave signal with the peak-to-peak value of the built-in exhaust pressure wave average signal. When the difference between the two is greater than or equal to a preset threshold, the central processing unit 3 generates an engine misfire determination signal, and when the difference is smaller than the preset threshold, it is determined that the engine is in a normal working state. The threshold here is set according to factors such as different engine mod...

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Abstract

The invention provides an engine fire detection method and a detection device thereof, belonging to the technical field of automobile engines. The invention solves the problems of low detection precision and easy occurrence of wrong judgment of the traditional engine fire detection device. The engine fire detection device comprises a pressure sensor arranged on an engine exhaust system and used for collecting an exhaust pressure wave real-time signal, and the pressure sensor is connected with a central processing unit with a built-in exhaust pressure wave mean-value signal. The engine fire detection method comprises the following steps of: collecting the exhaust pressure wave real-time signal of the engine exhaust system by using the pressure sensor arranged on the engine exhaust system; inputting the collected exhaust pressure wave real-time signal to the central processing unit; and comparing the peak-to-peak value of the exhaust pressure wave real-time signal with the peak-to-peak value of the built-in exhaust pressure wave mean-value signal by the central processing unit. The invention has the advantages of simple signal processing process, difficult interference, high fire detection precision and the like.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to an engine misfire detection method and a detection device thereof. Background technique [0002] Engine misfires not only increase harmful gas emissions, but continued misfires can cause catalyst temperatures to rise significantly, resulting in severe thermal aging that can damage the catalyst. Therefore, accurate misfire detection and timely fault treatment are of practical value for reducing the harmful emissions of the engine and improving the life of the engine. At present, the engine misfire detection mainly adopts the crankshaft speed fluctuation method, but its signal processing process is relatively complicated, and when the road condition is not good, it is easy to misjudgment. [0003] In order to detect engine misfire, people have carried out long-term exploration and put forward various solutions. For example, Chinese patent literature discloses a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/11
Inventor 丁哲许勇李志成孙文凯李传海由毅李书福杨健赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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