Bench Test Research of A Spark Ignition Type High-power Methanol Engine Prototype
In order to develop a new type of 13LM100 methanol engine,the prototype of the methanol engine was tested on the bench using the comprehensive test platform of new energy power,and the fault phenomena such as engine starting difficulty,abnormal stall-ing and unstable torque,etc.,which appeared successively in the test process,were investigated and analyzed,and solutions for im-provement were proposed.The results show that when the fuel temperature is 21.5℃,the ambient temperature is lower than 10℃,and the coolant inlet temperature is lower than 50℃,the engine starts with difficulty.By controlling the inlet temperature above 50℃through the engine coolant thermostat system,the engine can be started smoothly.When the coolant return temperature is higher than 91.5±1℃,the engine stalls abnormally.Abnormal engine stalling can be avoided by controlling the return liquid temperature below 90.5℃ through the engine coolant thermostat system.After eliminating the fuel supply system,ignition system,air intake system and other factors,the engine still has unstable torque.Adjusting the EGR flow coefficient by sweeping the points and selecting the EGR rate corresponding to the best test result can ensure smooth engine operation and stable torque.
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