Idling control method and system for dual-fuel engine, and vehicle

Abstract

The invention provides an idling control method and an idling control system for a dual-fuel engine, and a vehicle. The method comprises the following steps: acquiring intake air temperature and engine coolant temperature; judging whether a preset condition is met according to the intake air temperature and engine coolant temperature; and if the preset condition is met, selecting an idling fuel injection mode according to the intake air temperature, wherein the idling fuel injection mode comprises a pure diesel injection mode, a partial-cylinder dual-fuel injection mode and a full-cylinder dual-fuel injection mode: when the intake air temperature is less than a first threshold value, selecting the pure diesel injection mode for idling; when the intake air temperature is greater than the first threshold value and less than a second threshold value, selecting the partial-cylinder dual-fuel injection mode for idling; when the intake air temperature is greater than the second threshold value and less than a third threshold value, selecting the full-cylinder dual-fuel injection mode for idling, wherein the first threshold value is less than the second threshold value, and the second threshold value is less than the third threshold value. The method disclosed by the invention has the advantage of effectively reducing the emission of exhaust gas pollutants during idling.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an idle speed control method, system and vehicle of a dual-fuel engine. Background technique [0002] As environmental problems and energy problems become more and more severe, attention is paid to the fuel economy and emissions of internal combustion engines. Internal combustion engines are currently widely used in various industries. In the automotive industry, the emission regulations formulated by the state are becoming more and more stringent. How to Reducing the fuel consumption of the engine, reducing the emission of pollutants, and improving the power and economy are the goals pursued by major automobile manufacturers around the world in recent years. Traditional engines are mainly divided into gasoline engines and diesel engines. Gasoline engines have better emissions, but their fuel economy is determined by their ignition methods. Diesel engines use compression comb...

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Problems solved by technology

On the one hand, when the engine is just started, the intake air temperature and water temperature are low, a good thermal atmosphere is not established in the cylinder, and the ignition point of gasoline is high. At this time, it is not easy to burn after injecting gasoline, resulting in vibration when the engine is running; On the other hand, when the engine returns to idle speed from high load, the intake air temperature and water temperature are high, and there is also a good thermal atmosphere in the cylinder. At this time, gasoline injection cannot be introduced, so that the dual-fuel engine cannot be fully utilized. Advantage

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