Study on Cylinder-to-Cylinder Nonuniformity of Heavy-Duty Spark-Ignited Methanol Engine under Cold Start Idle Mode

Abstract

The cylinder-to-cylinder nonuniformity problem of a V8 heavy duty methanol engine under cold start idle mode is investigated in this paper. A data acquisition program for collecting the original signal of the engine speed was designed using Labview graphical programming software. Combined with NI data acquisition equipment, the original signals of the crankshaft and camshaft speeds were collected. By calculating the instantaneous speeds of each cylinder's power stroke, the speed fluctuation and nonuniformity degree of each cylinder were determined. Combining the intake mass data of each cylinder, the nonuniformity of each cylinder was analyzed based on this information. The calculation results indicate that there are certain differences in the power stroke capabilities of each cylinder under idle conditions, and the nonuniformity of each cylinder is caused by variations in intake mass.