Control method and system for multi-stroke circulation gasoline engine and vehicle

Abstract

The invention provides a control method and system for a multi-stroke circulation gasoline engine and a vehicle. The control method comprises the steps that if the engine is a multi-stroke circulation direct-injection gasoline engine, gasoline fuel is provided for a combustion chamber from the end section of an induction stroke and / or a compression stroke to the front section of an expansion stroke in a current multi-stroke circulation mode; ignition time is determined according to finishing temperature, a mixed gas average air-fuel ratio, a gasoline fuel injection amount around a compression upper dead center and injection timing, and ignition is performed at the ignition time; if the engine is a multi-stroke circulation port injection gasoline engine, the gasoline fuel is provided for a port at the induction stroke and / or an exhaust stroke in the current multi-stroke circulation mode; and ignition timing is determined during a period from the end section of the compression stroke to the front section the expansion stroke, and ignition is performed at the ignition timing. By adopting the method, fuel economy of the engine in multiple operation conditions can be effectively improved; and emission of tail gas pollutants is lowered.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method, system and vehicle of a multi-stroke cycle gasoline engine. Background technique [0002] At present, a vehicle internal combustion engine (such as a gasoline engine) is usually a four-stroke cycle internal combustion engine, that is, four strokes of intake, compression, power, and exhaust. The thermal energy of fuel combustion and explosion in the combustion chamber is transformed into rotational kinetic energy for external output through the crank-link mechanism, but in each working cycle, only less than a quarter of the time may be able to effectively output kinetic energy, while in the entire four The heat loss and mechanical loss in the stroke cycle always exist, especially in the ventilation phase (during the exhaust and intake strokes), 30% to 40% of the heat energy will be lost. The heat loss of the current four-stroke cycle internal combustion engi...

AI Technical Summary

Problems solved by technology

The current four-stroke cycle internal combustion engine has a lot of heat loss

[0003] Especially under the partial load operation of the internal combustion engine, the heat loss is very large, which leads to high fuel consumption and poor emission.

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