Petrol engine spark ignition excite homogeneous compression ignition combustion control method

Abstract

The invention discloses a petrol engine spark ignition excite homogeneous compression ignition combustion control method which belongs to the technical field of internal combustion engines. In the control method, an ignition advance angle is used for controlling ignition moments, and a combustion rate is controlled by an EGR rate. The petrol engine spark ignition excite homogeneous compression ignition combustion control method comprises the following steps: spraying fuel firstly in an air inlet process to form homogeneous rarefied mixed gas when an upper dead center is compressed; spraying fuel secondly in a compression stroke to form local thicker mixed gas around a spark plug; igniting the local thicker mixed gas to produce flame propagation by the spark plug; releasing heat by the combustion of the local flame propagation; compressing the around large-area rarefied mixed gas to rise temperature and pressure to a self-ignite flammation state, thereby exciting the mixed gas in a whole cylinder to self-ignite in a large area in a multipoint mode, and quickly and completely burning the whole mixed gas; and otherwise, harmful emissions generated by burning the equivalent proportion mixed gas are effectively controlled by using a three-way catalyst of the traditional petrol engine.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a combustion mode and a control method for spark ignition of a gasoline engine to stimulate homogeneous compression ignition. Background technique [0002] HCCI (Homogeneous Charge Compression Ignition) is an internal combustion engine combustion technology that can achieve high efficiency and low NOx and PM emissions, but its industrialization faces three main problems: control of ignition timing and combustion rate; HC and CO emissions, and expansion of operating range. According to the existing literature, the use of combustion signal feedback can be used to control HCCI ignition; the use of three-way catalysts can solve HC and CO emissions; the biggest challenge of HCCI engines is to expand the high-load operating range. Under the limit of ensuring acceptable maximum pressure rise rate and maximum NOx emission, HCCI combustion of gasoline engine can only b...

AI Technical Summary

Problems solved by technology

Under the limitation of ensuring the acceptable maximum pressure rise rate and maximum NOx emission, HCCI combustion of gasoline engine can only be applied in low-to-medium load conditions

The reason is that using the existing HCCI technology, under the medium and high load conditions of the engine, the combustible mixture will spontaneously ignite at the same time, and the combustion speed is too fast, resulting in too high a pressure rise rate and a maximum explosion pressure, and the engine knocks

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