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Method and system for backfire monitoring

A technology of ignition energy and ignition advance angle, applied in charging system, automatic control, automatic control and other directions, can solve problems such as engine damage and insufficient power of natural gas engine, and achieve the effect of avoiding fault misjudgment and avoiding damage

Active Publication Date: 2021-06-18
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tempering will cause problems such as insufficient power of the natural gas engine, and in severe cases, it will cause damage to the engine

Method used

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  • Method and system for backfire monitoring
  • Method and system for backfire monitoring
  • Method and system for backfire monitoring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 and figure 2 As shown, a method for tempering monitoring includes the following steps:

[0035] Step S0, judging the validity of the sensor; the purpose of judging the validity of the sensor is to collect accurate data so as to accurately monitor the tempering and avoid misjudgment and untimely judgment. The sensor validity judgment is to use other sensors on the car, combined with ambient temperature, humidity, pressure, etc., to test the validity of the sensor when the car is parked. If the sensor used in the present invention is consistent with the environmental parameters collected by other sensors on the vehicle, or if the sensor is powered on, it indicates that the sensor is valid.

[0036] Step S1 , the engine is running normally; whether it is running normally is judged by the engine speed and load.

[0037] Step S2, acquiring throttle position, intake pressure and intake temperature;

[0038] Step S3, respectively judging whether the rate of ...

Embodiment 2

[0054] like image 3 As shown, a tempering monitoring system includes an electronic control unit, a detection unit electrically connected to the electric control unit, a tempering detection unit and a fault analysis unit. The detection unit is used to obtain the throttle position, intake air pressure and intake air temperature. The detection unit includes a speed sensor, a throttle position sensor, an intake air temperature sensor and an intake air pressure sensor; the tempering detection unit is used to judge the throttle valve respectively. Whether the rate of change of position, the rate of change of intake pressure and the rate of change of intake air temperature are within the corresponding preset range of rate of change, if none of them are within the range, a backfire occurs, otherwise no backfire occurs; the fault analysis unit is used to obtain Ignition advance angle, to judge whether the ignition advance angle is within the preset ignition advance angle range; if yes...

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Abstract

The invention discloses a tempering monitoring method and system, relating to the field of engines, comprising the following steps: the engine runs normally, acquiring the position of the throttle valve, the intake pressure and the intake air temperature; respectively judging the change rate of the throttle valve position and the intake air pressure Whether the rate of change and the rate of change of intake air temperature are within the corresponding preset change rate range; if both, the ignition advance angle is obtained; otherwise, restore the preset ignition advance angle; determine whether the ignition advance angle is within the preset ignition advance angle range If the ignition advance angle is delayed, correct the ignition energy; otherwise, confirm the engine failure, limit the torque and issue a warning. It can be seen that the present invention judges whether tempering occurs by monitoring the rate of change of throttle position, intake pressure and intake air temperature, and distinguishes normal changes at the same time to avoid misjudgment of faults. The fault indicator light and so on remind timely maintenance and inspection to avoid damage to engine parts due to backfire.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a backfire monitoring method and system. Background technique [0002] Intake flashback of natural gas engine is a phenomenon that the mixture of natural gas and air burns abnormally in the intake pipe. The factors that usually cause backfire are too rich mixture, abnormal ignition timing, abnormal valve clearance, abnormal gas system, engine cylinder head cracks etc. Backfiring will cause problems such as insufficient power of the natural gas engine, and in severe cases, it will cause damage to the engine. Contents of the invention [0003] In view of the above deficiencies, the technical problem to be solved by the present invention is: to provide a backfire monitoring method and system, which can timely and accurately detect whether backfire occurs, and can take timely measures to avoid damage to engine components and improve engine operation. [0004] In order to solve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08F02M35/10F02P5/145
CPCF02B77/08F02M35/10373F02M35/1038F02P5/145
Inventor 韩雨潘永传刘锡庆赵令辉
Owner WEICHAI POWER CO LTD
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