压电式喷油器多参数优化匹配研究

Multi-Parameter Optimization and Matching of Piezoelectric Injector

作为新兴的驱动控制技术,压电式喷射技术由于快速的动态响应特性,为柴油机精确的小油量、多次喷射提供了可靠保证。针对自行研制的压电式喷油器,基于AMESim软件建立了压电喷油器一维电-机-液耦合数学模型,以喷油器针阀响应特性指标为优化对象,获得对喷油器响应特性影响权重较大的结构参数,分别采用正交试验优化(DOE)和遗传算法优化方法对关键结构参数进行多目标优化。结果表明:优化后针阀开启延迟缩短了16%,开启时间减少了23.6%,关闭延迟缩短了13.6%,关闭时间减少了13.3%,针阀响应特性获得了很大提高,有利于实现小油量喷射和多次喷射。

Taking as a newly-proposed drive control technology,the piezoelectric injection technology provides a reliable approach for the precise injection of tiny fuel and multi-injection due to its rapid and dynamic response.A one-dimensional electrical-mechanical-hydraulic coupling mathematical model of self-developed piezoelectric injector was established based on AMESim software.Taking the response characteristic index of injector needle valve as the optimized object,the structural parameters that had a great influence on the response characteristic of injector were determined.The orthogonal experimental optimization(DOE)and genetic algorithm were used respectively so that multi-objective optimization of key structural parameters was carried out.The results show that the opening delay and duration of needle valve shorten by 16% and 23.6%respectively and the closing delay and duration shorten by 13.6% and 13.3% respectively after optimization.The response characteristics of needle valve greatly improve,which is conducive to realize tiny fuel injection and multi-injection.