Gasoline engine gas mixture automatic enrichment control method based on characteristic MAP graph

Abstract

The invention provides a gasoline engine gas mixture automatic enrichment control method based on a characteristic MAP graph, and the method eliminates fire chattering phenomenon caused by slight sparse of gas mixture concentration in a warm-up period after a vehicle is started, so as to ensure smooth operation of an engine in a later period, improve combustion, and optimize emission. The method comprises: determining whether components of an electronic fuel injection system have faults, determining parameters of engine operating states, required by entering automatic enrichment control, adjusting gas mixture automatic enrichment control, and determining to quit the automatic enrichment control. In the gasoline engine gas mixture automatic enrichment control method based on a characteristic MAP graph, an engine control unit (ECU) determines current speed fluctuation conditions through related signals of engine operating conditions, the signals being required by the ECU, implements automatic regulation on fuel injection pulse width, so as to realize rational control on gas mixture in the current working mode.

Description

technical field [0001] The invention relates to the technical field of gasoline engines, in particular to an automatic enrichment control method of a gasoline engine mixture based on a characteristic MAP map. Background technique [0002] At present, the control of the mixture by the engine control unit (ECU) is mostly realized through closed-loop PI adjustment. However, in order to maintain the smooth operation of the engine during the warm-up period after starting, considering that the signals of various sensors and the operation of the engine are still unstable at this time, if it is too early The use of closed-loop control, on the contrary, leads to the aggravation of the above problems, so the slightly rich air-fuel ratio under open-loop control is often used in the warm-up stage. Based on this method, many vehicles often have misfire vibrations caused by lean mixture concentrations during the warm-up period after starting. Under idling conditions, through PI adjustmen...

AI Technical Summary

Problems solved by technology

Under idling conditions, through PI adjustment, it can be appropriately weakened, but if the actual mixture is too lean, it is difficult to control it reasonably; for non-idling conditions, it is even impossible to control the stable speed, which will lead to deterioration of drivability

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