超高压共轨系统电控增压器多参数优化匹配

Multi-Parameters Optimization on Electric-Controlled Pressure Amplifier of Ultra High Pressure Common Rail System

阐明了超高压共轨系统的工作原理,通过AMESim软件建立了电控增压器的仿真模型,利用试验验证了模型准确性,而后在进行参数灵敏度分析的基础上选取了对电控增压器性能影响较为明显的结构参数,并基于数值仿真结合正交设计法优化的方法,以电控增压器增压能力、响应速度以及经济性为目标,对其开展了优化匹配,得到了各结构参数对电控增压器性能的影响权重和最佳参数组合.仿真结果表明:出油孔直径是对电控增压器性能影响权重最大的参数,阀芯位移和阀芯质量次之.最后,基于优化匹配结果试制了电控增压器,并利用超高压共轨系统试验台架开展了电控增压器参数优化前、后性能对比试验.试验结果表明:相比于原参数方案,参数优化后的电控增压器增压能力、响应速度以及经济性均得到提升,其最大增压压力提高了6.9%,,复位时间减少了41.7%,,平均燃油泄漏率降低了30.8%,.

The working principle of ultra high pressure common rail system was introduced. A simulation model of the electric-controlled pressure amplifier was established by using AMESim software and the accuracy of this model was verified by experiment. With the simulation model combined with orthogonal design, the structural parameters, which have a great infuence on the performance of electric-controlled pressure amplifier, were selected on the basis of parameter sensitivity analysis and then were optimized to improve the pressurizing capacity, response speed and fuel economy of electric-controlled pressure amplifier. The influencing weight of each structure parameter on the per- formance of electric-controlled pressure amplifier as well as the optimal parameter combination was also re- searched. The simulation results show that the diameter of fuel outlet hole is the most influencial parameter to the per- formanee of electric-controlled pressure amplifier followed by the valve core displacement and valve core mass. Finally, the prototype of electric-controlled pressure amplifier was manufactured based on the optimization results. The performance comparison experimental research of electric-controlled pressure amplifier before and after parameter optimization were then carried out based on the ultra-high pressure common rail fuel injection system test bench. The experimental results show that after the parameters optimization, the pressurizing capacity, response speed and fuel economy of the electric-controlled pressure amplifier are improved. The maximum boosting pressure increases by 6.9%. The reset time decreases by 41.7%. And the average fuel leakage rate reduces by 30.8%.