ISAD技术混合动力柴油机起动系统的低温试验

针对ISAD技术混合动力柴油机起动系统低温下的性能问题，该文结合柴油机的起动阻力矩、最低起动转速、ISG电机工作特性和电机热效应等因素，研究了起动阻力矩随环境温度、起动转速的变化规律，分析了起动阻力矩与ISG电机功率、蓄电池容量之间匹配关系，以及影响蓄电池性能的主要因素。通过ISAD柴油机起动台架试验可以看出：相同的环境温度下，起动阻力矩随起动转速的提高而增大，每提高50 r/min，每缸平均起动阻力矩增加3～8 N·m；起动阻力矩随环境温度的下降而增加，0℃以下时，每降低5℃，平均每缸起动阻力矩增加2.5 N·m。研究表明：ISAD混合动力柴油机的着火转速较之原柴油机大幅度提高，可达350 r/min以上，从静止到着火转速的起动时间为0.5 s，到怠速稳定的时间为3.1 s，起动时间比原柴油机缩短，且转速波动较小。

Low-temperature experiment on starting system of ISAD hybrid diesel engine

According to starting performance of hybrid diesel engine of ISAD technology at low temperature, the match relationship among starting resistance torque, ISG motor power and storage battery capacitance was summarized, and influence of battery capacity was studied, which were as related to resistance torque, minimum start-up speed, electrical operating characteristics, electric transmission coefficient and thermal effects. The experiment result shows that, as far as the environment temperature decreases -5℃, starting resistance torque increases 2.5 N·m; starting resistance torque increases 3-8 N·m when the rotating speed increases 50 r/min. Studies have shown that, the first fire speed of ISAD diesel engine was increased, which was up to more than 350 r/min .The starting time from 0 to fire was 0.5 s, while the idle time was only 3.1 s, which was shorter than the original diesel engine, and fluctuations in speed was small.