A high-power multi-point EFI gas engine misfire detection method and detection device

Abstract

The invention relates to a high-power multi-point injection misfire detection method and device for a gas engine. The high-power multi-point injection misfire detection method comprises the following steps: (1) a crankshaft signal panel arranged at the tail end of a flywheel, together with a crankshaft position sensor, acquires a crankshaft position signal; (2) a camshaft signal panel arranged on a camshaft, together with a camshaft position sensor, acquires a camshaft position signal; (3) the phase position of the engine is acquired according to the crankshaft position signal and the camshaft position signal, compression top dead centers of all cylinders of the engine are sequentially determined, and the crankshaft position sensor acquires the total tooth pulse width Varsum of working bend sections after compression top head centers of all the cylinders of the engine cylinder by cylinder; and (4) whether the engine is on fire or not is determined through the total tooth pulse width Varsum. Compared with the prior art, the high-power multi-point injection misfire detection device has the advantages of reasonable design, simple structure, small calculated amount, accurate judgment and the like.

Description

technical field [0001] The invention relates to the field of automobile engine fault diagnosis, in particular to a high-power multi-point electric injection gas engine misfire detection method and detection device. Background technique [0002] The engine misfire failure will not only greatly increase the emission of harmful gases, but also the continuous misfire will cause the temperature of the catalyst to rise significantly, so that severe thermal aging will cause damage to the catalyst. Therefore, accurate misfire detection and timely fault treatment have practical application value for reducing the harmful emission of the engine and improving the life of the engine. [0003] At present, the methods of engine misfire diagnosis are mainly divided into three categories: 1) torque estimation method, which is to calculate the instantaneous torque or the gas pressure in the cylinder according to the instantaneous rotational speed by establishing a linear or nonlinear dynamic ...

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Problems solved by technology

The first method has high accuracy for fault judgment, but it needs to know the structural parameters of the engine, and the algorithm is complicated, it is difficult to meet real-time performance, and it is mostly used for offline post-processing diagnosis

At present, the engine misfire detection mainly adopts the third method, which directly uses the instantaneous speed or acceleration of each cylinder of the engine to compare with the value under normal conditions to determine the fault, but the calculation of the instantaneous acceleration requires a large amount of calculation.

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