Cold start method of methanol engine

Abstract

The invention discloses a cold start method of a methanol engine. According to the cold start method of the methanol engine, engine cold start is performed through natural gas injection, methyl alcohol and natural gas are injected simultaneously to perform engine cold start, or the methyl alcohol and natural gas are injected alternatively to perform engine cold start. According to the cold start method of the methanol engine, in the cold start process of the engine, the natural gas and air are mixed and then enter an air cylinder to be ignited, after the engine is started successfully, at the moment, the temperature of the air cylinder avoidance surface and the temperature of the cylinder cover avoidance surface are high, and the mixed gas of the methyl alcohol and air is prone to ignition, so that the problem that it is difficult to perform cold start under a methyl alcohol combustion mode is solved, the ignition energy requirement of a ignition system is lowered, firing combustion of the engine with the ignition manner being a lighting manner is achieved more easily, and reliability of the ignition system and safety of the engine are improved.

Description

technical field [0001] The invention relates to the field of engines, in particular to a method for cold starting a methanol engine. Background technique [0002] In recent years, due to the shortage of oil resources, the diversification of engine energy has intensified, and engines that rely on oil as fuel urgently need to find alternative fuels. The engine using methanol fuel as an alternative fuel has good development potential and application prospects, no matter in terms of meeting the engine power performance requirements or in terms of long-term supply possibility, production technology and use cost, and is a more suitable alternative fuel. Moreover, the engine exhausted by methanol has no soot, and the emissions of nitrogen oxides, particulate matter, and hydrocarbons are reduced, thereby reducing the pollution of the engine exhaust to the environment. The combustion method of a methanol engine is similar to that of an engine burning traditional fuels, that is, afte...

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Problems solved by technology

[0003] In the prior art, the mixture of methanol and air is ignited by spark plug ignition, but due to the high ignition temperature of methanol, during the cold start of the engine, due to the low intake air temperature, low engine water temperature and low oil temperature, the engine cylinder avoids The temperature of the surface and the cylinder head avoiding surface is low, high ignition energy is required to ignite the mixture gas, it is difficult to ignite the mixture gas, and the engine cannot start smoothly

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