自然吸气发动机多温度点重复起动特性分析及其优化

In order to analyze and optimize the multi temperature points repeated start characteristics of a 1.5L naturally aspirated engine, the vehicle equipped with the engine was tested at 20 ℃～80 ℃ based on the ECU basic data. According to the test results, the repeated start characteristic data was counted and analyzed. Finally, the repetitive start calibration was optimized according to the analysis problems. The results show that the basic data of ECU has low overshoot value, long start time and many times of speed drop in the region of water temperature 40 ℃～60 ℃. When the ignition angle of the first start at 20 ℃～80 ℃ is advanced by 3 CA, the injection quantity of the first start at 40 ℃～60 ℃ is increased by 5%, and the injection correction of repeated start is reduced from 25% to 15%, the repeated start quality of the whole temperature range has a certain improvement, the poor repeated start performance in the range of 40 ℃～60 ℃ is improved.