During the process of multi‐injection ,the mutual influences between different injections led to the difficult control of cycle fuel injection quantity .The AMESim model of high pressure common rail system was established .The fundamental reason of main injection fluctuation with injection interval was proved to be the strong coupling behavior of internal pressure fluctuation and needle valve opening action by combining the numerical simulation and actual test .The largest fluctuation was 3 .6 mm3 when the reference value of main injection was 60 .0 mm3 .In addition ,the undamped LC hydraulic system model was established and analyzed .The decoupling method of decreasing the length‐diameter ratio of internal fuel duct and the delivery chamber volume with respect to the strong coupling was proposed .The simulation verification showed that the coupling degree of pressure fluctuation and needle valve response decreased by 53% .

48V汽车电气系统随着怠速启停等先进节能技术的不断发展受到了越来越广泛的关注.作者就四阶段油耗标准下,对传统12V系统未来的节能潜力进行了探究,并对48V系统的技术可行性做了深入分析.同时,还对"12+48V"系统的未来应用趋势进行了评估,研究发现,其能够满足2018年以后的节能需求,并具有单车技术成本小、技术结合面广、对燃油品质要求低和契合现行油耗体系及乘用车未来发展趋势等优点,可行性较大.