Method for realizing gasoline engine idling and small-load controllable spontaneous combustion

Abstract

The invention discloses a method for realizing gasoline engine idling and small-load controllable spontaneous combustion. When a controllable spontaneous combustion engine reaches the lower limit of the conventional load, in order to further reduce the engine load, a measure of bringing forward the opening moment of an air inlet door when the residue waste gas rate in an engine cylinder is increased is adopted, and in addition, the closing moment of the air inlet door is maintained to be positioned in a range of the maximum engine effective compression ratio position + / -30 DEG CA. The method belongs to the combustion control strategy used for expanding the operation range of the controllable spontaneous combustion gasoline engine in the small-load and idling direction developed on the basis of a fully variable air door movement mechanism. The method disclosed by the invention can solve the realization problem of the controllable spontaneous combustion of the gasoline engine at the small load, so the introduction of the complicated combustion mode switching process into the small-load work condition under the severe combustion condition is avoided, the practical application of the controllable spontaneous combustion gasoline engine can be promoted, simultaneously, the controllable spontaneous combustion can be realized under the small-load work condition, and the oil can be saved by more than 17 percent through being compared with the traditional spark ignition (SI) combustion of the gasoline engine.

Description

technical field [0001] The invention belongs to a combustion control method of an automobile engine, in particular to a combustion control strategy for expanding the operating range of a controllable spontaneous combustion gasoline engine for expanding waste gas management under an equivalent air-fuel ratio to light load and idle conditions. Background technique [0002] The controllable spontaneous combustion combustion technology of gasoline engines is the representative of the new generation of engine combustion concepts. It is a new combustion technology developed to meet the more stringent regulatory requirements in the next 10 to 20 years. Compared with the traditional throttle control SI combustion, it has 10% to 30% energy saving oil potential. However, there are still some problems in the controllable self-ignition combustion technology that need to be overcome, one of which is the expansion of its operating range to small load and idle conditions. The main reason ...

AI Technical Summary

Problems solved by technology

This method improves the compression ratio, although it is beneficial to the expansion of small loads, but it is not conducive to the combustion control at high loads. At the same time, it is difficult to use the method of external heat source in practical applications.

Of course, the most important thing is that this method can not solve the problem of exhaust gas management gasoline engine controllable spontaneous combustion expansion to small loads under the equivalent air-fuel ratio

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