Fuel self-adaptation control method for flexible fuel engine

Abstract

The invention relates to a fuel self-adaptation control method for a flexible fuel engine. The fuel self-adaptation control method comprises the steps that a gasoline and diesel mixing flexible fuel engine combustion closed-loop control system which comprises an engine electronic control unit, a flexible fuel compression-ignition engine, a piezoresistive cylinder pressure sensor and a fuel self-adaptation control unit is arranged, wherein the fuel self-adaptation control unit comprises a power performance self-adaptation control module, an economical efficiency optimizing self-adaptation control module and a mean effective pressure calculating module; an IMEP and an PMEP are obtained by the mean effective pressure calculating module and are transmitted to the power performance self-adaptation control module, and meanwhile, the IMEP is transmitted to the economical efficiency optimizing self-adaptation control module; a new fuel-injection amount is obtained by the power performance self-adaptation control module and is transmitted to the engine electronic control unit, and the self-adaptation control is carried out on fuel power performance by the engine electronic control unit; a fuel-injection time corrected value is obtained by the economical efficiency optimizing self-adaptation control module and is transmitted to the engine electronic control unit, and the optimized self-adaptation control is carried out on fuel economical efficiency by the engine electronic control unit.

Description

technical field [0001] The invention relates to the technical field of electronically controlled engine control, in particular to a fuel adaptive control method for a flexible fuel engine. Background technique [0002] The original intention of the concept of alternative fuels is to find new energy sources to cope with the possible oil energy shortage crisis. Flexible fuel vehicles are also considered to be an important direction for the future development of internal combustion engines. The use of alternative fuels can not only realize the diversification of fuels and solve the problem of oil shortage around the world, but also a large number of studies have shown that, compared with traditional gasoline and diesel, some alternative fuels can improve engine combustion characteristics and reduce emissions. Potential not to be ignored. At present, alternative fuels suitable for gasoline engines have been commercialized, and the most common one is ethanol gasoline, which is ...

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Problems solved by technology

Changes in dynamics lead to changes in the driver's driving experience, which is not conducive to the driving experience; the economy cannot achieve the optimal control effect

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