Vehicle engine key period signal fault detection and recovery method under electromagnetic pulse interference

An electromagnetic pulse and periodic signal technology is applied in the field of vehicle engine key periodic sensor signal fault detection and recovery, and the detection and recovery of disturbed signals, which can solve the lack of fast and accurate detection methods for signals and the lack of electromagnetic pulse interference signal recovery methods. And other issues

Active Publication Date: 2020-09-18
JILIN UNIV
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Problems solved by technology

[0009] To sum up, at present, there is no fast and accurate detection method for the signal of the key sensor of the vehicle engine interfered by the electromagnetic pulse, and there is also a lack of recovery method for the electromagnetic pulse interference signal, which can be quickly and accurately detected based on the waveform structure of the electromagnetic p

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  • Vehicle engine key period signal fault detection and recovery method under electromagnetic pulse interference
  • Vehicle engine key period signal fault detection and recovery method under electromagnetic pulse interference
  • Vehicle engine key period signal fault detection and recovery method under electromagnetic pulse interference

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Embodiment Construction

[0048] Include the following steps:

[0049] (1) Judging whether the high level of the sensor signal is normal;

[0050] (1) Start detection and record the normal signal waveform period T 0 , and at the same time determine the constant k according to the change of the engine speed, and start the timing detection on the rising edge;

[0051] (2) To judge whether the high level is normal, at the rising time t 1 Start the timer until the falling edge time t 2 Stop timing, the time difference is △t, if satisfy |△t 1 -dT 0 |≤k, the high level is the normal range, T 0 It is the period of a complete normal signal before the detection part, d is the high level duty cycle; Δt 1 is the high level width; k is a constant, when the high level is in the normal range, go to step three (1), and when the high level does not meet the normal range, go to step two (1);

[0052] (2) Judging whether the high level is shortened or delayed, if the high level is delayed, judge whether the high ...

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Abstract

The invention relates to a vehicle engine key period signal fault detection and recovery method under electromagnetic pulse interference, and belongs to a disturbed signal detection and recovery method. The method includes judging whether sensor signal high level is normal or not; judging whether the high level is shortened or delayed, and supplementing the normal pulse according to the strong interference delay condition of the high level; judging whether the sensor signal low level is normal or not; judging whether the low level is shortened or delayed, judging whether the low level is electromagnetic pulse strong interference or not, and supplementing normal pulses according to the strong interference delay condition of the low level; and stopping detection. The method has the advantages that a corresponding processing method can be carried out for any interference condition, and the method is accurate; the waveform interfered by the electromagnetic pulse can be detected to supplement the normal pulse segment only by connecting the output end of the signal waveform to be recovered into the single chip microcomputer, and finally the normal waveform is output, so that the operation is simple, convenient, time-saving and labor-saving. The method can be applied to the fields of electronic communication, signal detection and the like.

Description

technical field [0001] The invention relates to a detection and recovery method of a disturbed signal, in particular to a fault detection and recovery method of a key periodic sensor signal of a vehicle engine under electromagnetic pulse interference. According to the characteristics of the periodic switch signal, fault detection is performed in the time domain . Electromagnetic interference is coupled into the on-board electronic system through cables to generate coupling voltage and disturb the normal signal waveform; the signal detection method is used to detect the sensor signal of the key cycle of the engine that is coupled by electromagnetic interference to determine the error type. The invention can be used in the fields of electronic communication, signal detection and the like. Background technique [0002] With the development of vehicles in the past hundred years, the electronicization of vehicles has received great attention. As a very important part of vehicles...

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Application Information

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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 陈建张骞孙晓颖孙铁刚燕学智赵昱胡溥宇
Owner JILIN UNIV
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