Detection device and method for engine misfiring, cross-ride vehicle

Abstract

The present invention provides a spark failure detection device of the engine and the vehicle provided with the spark failure detection device, reasonalize the output of the spark failure detection according to the engine considering the air fuel ratio of the air-exhausting system. The spark failure detection device of the invention, is characterized in that it has the following components: a spark failure detection mechanism which is used to detect the spark failure of the engine (12); a MIL (44) which lights the lamp corresponding to the spark failure detection result of the spark failure detection mechanism; a digital data of the air fuel ratio obtaining mechanism, which obtains the pressure of the breathing pipe, the rotating speed of the engine (12) and the opening-and-closing state of the secondary air quantity control valve (34), as the air fuel ratio digital data relative to the air fuel ratio of the air-exhausting system which is used to circulate the exhausted air of the engine; and a ECU (42) which restrains the lighting of the MIL (44) corresponding to the relative digital data of the air fuel ratio which is obtained by the relative digital data obtaining mechanism.

Description

technical field [0001] The present invention relates to an engine misfire detection device and method, and a saddled vehicle, and particularly relates to the technical field of rationalizing outputs (for example, lighting or flashing of a warning lamp) corresponding to engine misfire detection. Background technique [0002] For straddle-type vehicles such as motorcycles, environmental protection solutions are also urgently needed. In particular, since the misfire of the engine deteriorates the exhaust gas of the engine, it is necessary to detect and output the occurrence of misfire as accurately as possible. [0003] On the other hand, in the engine, there is a device for introducing secondary air in the exhaust system, so that HC (hydrocarbons) and CO (carbon monoxide) contained in the exhaust gas can be oxidized and converted into into water vapor and carbon dioxide. Furthermore, when a catalyst is provided in the exhaust system, NOx (nitrogen oxides) contained in the ex...

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Problems solved by technology

[0006] However, what is described in the above-mentioned Patent Document 1 is that the relationship between the catalyst temperature and the purification rate of HC is made into a graph, and the relationship between the number of ignitions after the last misfire and the recovery rate of the catalyst performance is also made into a graph. The above chart calculates exhaust emissions without considering the air-fuel ratio (ratio of air to fuel) of the gas introduced into the exhaust system

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