Control method of combustion engine using dimethyl ether and high-octane rating fuel

Abstract

The invention provides a control method of a combustion engine using dimethyl ether and high-octane rating fuel, relating to a flexible scene mixing mode of dimethyl ether (DME) and high-octane rating fuel combining with a compound mixing combustion mode of ignition and compression ignition. According to the operation working condition of the combustion engine, the combustion mode is selected, and the scene mixing in different ratios is regulated in real time by using the pure DME and high-octane rating fuel so as to meet the requirement of the combustion engine on the fuel under the whole working condition. Under a starting and idling working condition, ignition is carried out by the pure DME; when in 0-30% small load, high-octane rating fuel-DME with high DME mixing ratio is used for carrying out homogeneity premixing and compression ignition; when in 30-70% intermediate load, the high-octane rating fuel-DME mixing fuel with low DME mixing ratio is used for carrying out spark ignition; and when in 70-100% high load, high-octane rating fuel is used for ignition. By using the technology, a combustion engine for a vehicle can reach an emission standard above ohm 4, and an efficient technical way is provided for using and consuming oil and fuel as well as improving engine heat efficiency and fuel oil economy.

Description

technical field [0001] The invention provides a control method of an internal combustion engine using dimethyl ether DME and high-octane fuel on-site mixing and compound combustion mode, and specifically relates to a combustion control and operation mode, fuel preparation and supply of the internal combustion engine. Background technique [0002] With the rapid increase of vehicle ownership, energy consumption and environmental pollution have become the focus of people's attention, and it is also one of the problems that need to be solved urgently. With the development of electronic control technology, traditional gasoline engines and diesel engines have been greatly improved and improved in terms of fuel consumption and exhaust emissions, but they still have their own disadvantages. Due to the stoichiometric equivalent ratio and premixed homogeneous combustion of traditional gasoline engines, NOx and PM emissions are low. At the same time, due to the low compression ratio,...

AI Technical Summary

Problems solved by technology

However, since the vehicle engine is in a constantly changing and complex process during operation, it is difficult for a single combustion mode and traditional single fuel to meet and adapt to the operating requirements of the engine under all working conditions, resulting in the reduction of emissions while consuming part of the power or increasing fuel consumption. and so on

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