Engine misfire detection method and device

Abstract

The invention discloses an engine misfire detection method and device. The engine misfire detection device comprises a quartz lens, an optical fiber and a photoelectric conversion circuit, the quartz lens is fixed on the bottom of a spark plug of an engine, the optical fiber is fixed in a guiding hole arranged in the outer wall of the spark plug, radiation focused by the quartz lens can be conducted to the interior of the optical fiber, and the tail end of the optical fiber is connected to the photoelectric conversion circuit. The engine misfire detection device is low in cost, simple in system software and hardware, excellent in reliability and real-time performance and flexible in arrangement, the engine does not need to be specially transformed, and the engine misfire detection device can be installed on a specially-produced spark plug and also can be installed on a specially-produced nozzle, and can directly judge whether combustion is normal or not by means of the infrared spectrum of the combustion.

Description

technical field [0001] The invention relates to the field of engine misfire detection, in particular to an engine misfire detection method and device for achieving misfire detection by detecting radiation. Background technique [0002] At present, engine misfire detection usually adopts ion current detection method, engine speed fluctuation detection method, engine exhaust pollutant detection method, and engine cylinder pressure detection method. The ion current method increases the system circuit cost and software cost, and its detection itself is seriously affected by the carbon deposit of the engine, and the probability of misjudgment is high; the engine speed fluctuation method only works in the low speed range, and cannot work normally at high speed; the engine exhaust pollutant detection, real-time The performance is poor and expensive sensors are needed; the real-time performance of engine cylinder pressure detection is good, but the cylinder pressure sensor itself is...

AI Technical Summary

Problems solved by technology

The ion current method increases the system circuit cost and software cost, and its detection itself is seriously affected by the carbon deposit of the engine, and the probability of misjudgment is high; the engine speed fluctuation method only works in the low speed range, and cannot work normally at high speed; the engine exhaust pollutant detection, real-time The performance is poor and expensive sensors are needed; the real-time performance of engine cylinder pressure detection is good, but the cylinder pressure sensor itself is very expensive, and only one or two in the world can manufacture it, with a limited lifespan and extremely harsh installation environment requirements

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