小排量涡轮增压汽油机电控技术研究

发布时间：2018-06-12 15:50

本文选题：汽油机 + 涡轮增压　；参考：《燕山大学》2016年硕士论文

【摘要】：小排量涡轮增压汽油机具有升功率高,燃油经济性好,且能改善排放性能的优点。因此,小排量涡轮增压汽油机技术成为机动车节能减排的主要技术。电控技术是发动机充分发挥其性能的关键。本文的小排量涡轮增压汽油机由7 8自然吸气发动匹配涡轮增压器改制而成,其控制参数发生改变,原自然吸气发动机的电控单元不能满足其要求。为解决此问题,本文以改制的小排量涡轮增压汽油机为对象,在模拟优化涡轮增压系统的前提下,对小排量涡轮增压汽油机电控技术进行研究。本文利用8 9软件建立小排量涡轮增压汽油机仿真模型,使用台架试验数据验证仿真模型,并利用仿真模型获取初始喷油+数据。根据电控单元的控制要求确定传感器和执行器,并对微控制器进行选型,设计曲轴位置信号、凸轮轴相位信号、增压压力信号等输入信号处理电路以及:9点火、喷油器、油泵等执行器的驱动电路等硬件电路。软件部分采用经典的前后台结构,利用;软件设计电控单元的主程序、输入信号处理、工况判断、燃油喷射、点火提前角控制等程序。根据涡轮增压汽油机的工作特性,制定喷油、点火提前角的开环控制策略。搭建小排量涡轮增压汽油机台架试验平台,利用自主开发的上位机软件对点火提前角进行标定,并对控制器的控制效果进行评价。试验结果表明:利用8 9软件建立的小排量涡轮增压汽油机仿真模型正确,仿真计算的初始喷油脉宽+正确有效,开发的电控单元对稳态工况空燃比的控制效果理想,初步完成了小排量涡轮增压汽油机的电控单元开发。
[Abstract]:The small displacement turbocharged gasoline engine has the advantages of high liter power, good fuel economy, and can improve the emission performance. Therefore, small-displacement turbocharged gasoline engine technology has become the main technology of energy saving and emission reduction of motor vehicles. Electronic control technology is the key to give full play to the performance of engine. In this paper, the small displacement turbocharged gasoline engine is modified from the 7 8 natural suction matching turbocharger, and its control parameters have been changed. The electric control unit of the original naturally aspirated engine cannot meet its requirements. In order to solve this problem, the electronic control technology of small displacement turbocharged gasoline engine is studied on the premise of simulating and optimizing turbocharging system. In this paper, the simulation model of small displacement turbocharged gasoline engine is established by using software 8.9, the simulation model is verified by bench test data, and the initial fuel injection data is obtained by using the simulation model. According to the control requirements of the electronic control unit, the sensors and actuators are determined, the microcontroller is selected, the crankshaft position signal, the camshaft phase signal, the pressurized pressure signal and the input signal processing circuit are designed. Oil pump and other actuators drive circuit and other hardware circuits. The software part uses the classical front and background structure, using; the software design the main program of the electronic control unit, input signal processing, condition judgment, fuel injection, ignition advance angle control and other programs. According to the working characteristics of turbocharged gasoline engine, the open loop control strategy of fuel injection and ignition advance angle is established. The bench test platform of small displacement turbocharged gasoline engine was built, and the ignition advance angle was calibrated by using self-developed upper computer software, and the control effect of the controller was evaluated. The experimental results show that the simulation model of small displacement turbocharged gasoline engine is correct, the initial injection pulse width calculated by simulation is correct and effective, and the control effect of the developed electronic control unit on the air-to-fuel ratio under steady condition is satisfactory. The development of electronic control unit of small displacement turbocharged gasoline engine is preliminarily completed.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.171

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