FSAE赛车发动机燃油经济性改善的仿真与试验
Simulation and Experiment Research on Improving Fuel Economy of Engine for FSAE
摘要
fSAE比赛要求赛车发动机气缸的进气都必须安装限制器,但进气量限制器降低了发动机最大的进气量和燃料的燃烧速率,造成了进气管内的压力损失,从而导致赛车的实际油耗相对增加.以单缸四冲程赛车发动机为研究对象,利用AVl bOOST分析软件对所建立的fSAE赛车发动机模型进行仿真,分析限制器造成的进气管内的压力损失以及对发动机功率、充气效率和燃油消耗的影响,根据分析结果结合电喷系统的特点建立了进气量修正方案.最后通过对发动机喷油脉宽的检测,验证了进气量修正控制单元满足设计要求,从而达到了降低油耗、提高赛车的竞争力的目的. In order to limit the maximum output power of formula society of automotive engineers(FSAE)car′s engine,a single circular restrictor is required to be installed at the engine.But the restrictor lowers the air flow speed and fuel burning rate,and the pressure of intake pipe declines.In this paper,the four-stroke engine of the FSAE car was investigated.We analyze the influence of intake restrictor on engine power,intake pipe′s pressure,volumetric efficiency and fuel consumption.One-dimensional engine cycle will be simulated by using AVL BOOST.Intake quantity correction was designed based on the characteristics of electronic fuel injection(EFI)system and analysis results.According to pulse width of driving signal for injecting fuel,the performance of FSAE car′s engine was improved by intake quantity correction of the control unit.Fuel consumption decreases,and fuel economical efficiency is improved.This research has provided an alternative method in order to improve the competitiveness of FSAE car with practical significance.