Research on improving fuel economy of electronic fuel injection engine for FSAE

FSAE比赛要求在赛车发动机进气系统的节气门与进气门之间安装一个进气量限制器，并且规定所有气缸的进气都必须通过此限制器，其目的是为了限制赛车的最大输出功率，保证比赛安全进行。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，同时也造成了进气管内的压力损失。对于应用电喷系统的发动机，限制器引起的压力损失，使得进气压力传感器测量的信息反映的进气量大于实际的进气量，造成了一定程度的喷油“过量”，破坏了赛车燃油经济性，降低了空燃比控制的精度，同时赛车动力性也受到影响。 本文以单缸四冲程赛车发动机为研究对象，首先剖析了发动机电喷系统的构成，分析电喷系统传感器的结构和输出特性，并从混合气体空燃比控制...In order to limit the maximum output power of FSAE car’s engine, a single circular restrictor is required to be deployed among the throttle and the engine in the intake system and all engine airflow should pass through this restrictor. Because the restrictor lower the air flow speed and fuel burning rate, the pressure of intake pipe decline. For EFI (Electronic Fuel Injection) system used in FSAE ...学位：工学硕士院系专业：物理与机电工程学院机电工程系_机械电子工程学号：1992007115116

Design and verification on air inflow correction system of FSAE engine

针对限制器引起的进气管内压力损失会增加赛车实际油耗的问题,该文以单缸四冲程赛车发动机为研究对象,从混合气体空燃比控制、喷油量的控制和进气量测量3个方面分析了电喷系统,结合电喷系统的特点建立了进气量修正方案,在此基础进行了控制单元的硬件和软件设计。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,达到了降低油耗、提高赛车竞争力的目的。In view of that the pressure loss in the air inflow pipe caused by the resrtictor makes the actual fuel consumption relatively increaseing,the four-stroke engine of the formula SAE car is investigated here.The electronic fuel injection(EFI) system is analyzed from three aspects of the air-fuel ratio control of the mixed gas,the control of fuel injection quantity,and the measurement of air inflow.According to the characteristics of the EFI system,the air inflow correction scheme is designed, and the hardware and software of the control unit are accomplished.The test of pulse-width of EFI system shows that the control unit of air inflow correction can meet the design requirements,reduce the fuel consumption,and improve the competitiveness of the FSAE.国家自然科学基金(51305372

Simulation and Experiment Research on Improving Fuel Economy of Engine for FSAE

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.国家自然科学基金(51305372); 国家公派出国留学项目(201306315012