Ignition system for high-power methanol engine and ignition method

Abstract

The invention provides an ignition system for a high-power methanol engine and an ignition method and belongs to the field of high-power methanol engines. The ignition system comprises a plurality ofsparking plug sets and a controller. The plurality of sparking plug sets are arranged in the positions of cylinder covers of all air cylinders of the high-power methanol engine correspondingly, and each sparking plug set comprises a main sparking plug and an auxiliary sparking plug. The controller is used for controlling all the sparking plug sets to perform ignition sequentially in a preset sequence and controlling the auxiliary sparking plug of each sparking plug set to perform ignition in preset time delayed after the main sparking plug performs ignition, and the preset time is obtained through a calibration experiment in which the maximum burning work after each sparking plug set performs ignition is used as an objective. The invention further provides the corresponding ignition method. By means of the ignition system and the ignition method, the burning thermal efficiency and the economical property can be improved.

Description

technical field [0001] The invention relates to the field of high-power methanol engines, in particular to an ignition system and an ignition method for high-power methanol engines. Background technique [0002] The lower calorific value of methanol fuel is much lower than that of gasoline, and the lower calorific value of gasoline is about 2.2564 times that of methanol, that is, the methanol fuel required to do the same external work is 2.2564 times that of gasoline fuel. The latent heat of vaporization of methanol is about 3.5806 times that of gasoline, that is, the same mass of fuel atomized, the heat required by methanol fuel is 3.5806 times that of gasoline fuel, so the heat absorbed by methanol fuel when the engine is working is about 8.09 times that of gasoline times (=2.2564*3.5806). When working at low temperature, especially when starting at low temperature, methanol engine fuel is difficult to atomize, and the mixture gas is not well formed. In order for the engi...

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Problems solved by technology

Due to the large volume of the combustion chamber of a high-power methanol engine, there are certain differences in the concentration of the mixed gas at various places. In addition, methanol is difficult to atomize, and the mixed gas near the spark plug is easy to burn, while the mixed gas farther away from the spark plug does not burn. On the one hand, methanol fuel reduces the economy of the engine, on the other hand, liquid methanol destroys the lubricating oil film between the piston ring and the cylinder liner of the engine, accelerates the wear of the engine, increases the air leakage of the engine, pollutes the engine oil, and affects the emission performance of the engine

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