An asynchronous ignition method for dual spark plugs based on optimized lean burn

Abstract

The invention discloses a double-sparking plug asynchronous ignition method based on optimized lean burn. An engine body is included and comprises at least one group of cylinder covers; two inlet valves and two exhaust valves are mounted on the cylinder cover; a main sparking plug is mounted on the top of the cylinder cover; and an auxiliary sparking plug is also arranged between the two exhaust valves. The asynchronous ignition method comprises the following steps: (1) before a piston reaches an upper dead center, the ignition timing of the main sparking plug is delayed for 3-7 degrees in comparison to the ignition timing of a gasoline engine with an ideal mixing ratio being 1, and the main sparking plug is controlled to ignite firstly; and (2) when the piston reaches the upper dead center, the auxiliary sparking plug is controlled to ignite. According to the double-sparking plug asynchronous ignition method based on optimized lean burn, through double-sparking plug asynchronous ignition, knocking combustion is avoided, so that the work stability of an engine is better, and the service life is longer; in addition, the combustion is full, the compression negative work and nitrogenoxide emission are reduced, and expansion work effectively acts on the piston, so that the engine efficiency and power are obviously improved.

Description

technical field [0001] The invention relates to the technical field of gasoline engines, in particular to an asynchronous ignition method with double spark plugs based on optimized lean combustion. Background technique [0002] The single-spark ignition combustion of homogeneous lean mixture mainly faces the problem of slow combustion speed, which leads to the reduction of gasoline engine efficiency and power. To solve this problem, the method of increasing the ignition advance angle is usually adopted, so that the highest combustion pressure is about 10 degrees after the top dead center (this value is the experience value of the best combustion), but in this way, knocking combustion is prone to occur, and the top dead center The pressure before the point also increases, resulting in an increase in negative work, and at the same time, the maximum pressure and temperature of combustion also increase, and for lean combustion, it leads to an increase in harmful emissions of nit...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that existing gasoline engines are prone to knocking, insufficient combustion leads to increased nitrogen oxide emissions, and insufficient expansion leads to a decrease in the efficiency and power of gasoline engines, providing A dual spark plug asynchronous ignition method based on optimized lean combustion, through dual spark plug asynchronous ignition can avoid knocking combustion, so that the gasoline engine has better working stability and longer service life; at the same time, it can make combustion more complete, reduce compression negative work and NOx emissions, and expansion work can be effectively applied to the piston, resulting in a significant increase in gasoline engine efficiency and power

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