【作者】 左从兵；

【导师】 刘一鸣；

【作者基本信息】 合肥工业大学 ， 制冷与低温工程， 2006， 硕士

【摘要】 为了实现PRVI(Pump-Rail-Valve-Injiector)燃料喷射系统在二甲醚发动机上的微电子控制,我们研究开发了四缸二甲醚发动机电控单元ECU。ECU采用主从双单片机结构形式,用外部扩展Flash存储器存储MAP数据。ECU工作过程中,对各传感器采集的信号进行数据处理和控制计算,以发动机的转速、负荷作为输入参数,依据MAP图确定喷射定时和喷射脉宽等控制量,以实现ECU的逻辑控制功能。 二甲醚发动机电控系统工作的正确与否,以及控制功能的发挥必须通过精心设计的软件才能得以实现。本论文的主要工作是在ECU硬件设计电路的基础上进行ECU软件设计,软件设计采用模块化结构,包括发动机管理模块、发动机控制模块和计算机监控系统。主要解决的问题包括:通过在发动机快速运转时主从单片机之间实时、准确的PSP通讯,协调控制MAP数据的及时读取与生成;分缸独立喷射的软件控制:三种电控模式(单片机控制模式、计算机控制模式、在线控制模式)软件设计:以及水温修正的软件处理。 为了验证ECU软件的可靠性和实时性,在油泵实验台上进行了发动机模拟实验。实验结果表明,在三种电控模式下,ECU都很好地实现了发动机基本工况下的信号采集、数据处理以及分缸独立逻辑控制功能,从而证实了设计软件的可行性和有效性。更多还原

【Abstract】 In order to achieve the microelectronic control by using fuel ejection system of PRVI(Pump-Rail-Valve-Injector) on four-cylinder dimethyl ether engine, the electric control element ECU for four-cylinder dimethyl ether engine has been explored. During the working process, ECU would carry out both the data processing of signals from sensors and control calculating. ECU would use the rotating speed of engine, load, etc as input parameters, control the ejection pressure and speed according to the pressure MAP data under corresponding working condition, ensure the ejection timing, ejection impulse width, and other controlling quantities according to the control MAP data, to realize the function of ECU logic control.ECU would adopt the couple sing chip structure, and externally expand Flash memorizer to memorize the MAP data. Modulization and subprogram structure would be utilized to develop the ECU software, including management module of engine, control module and computer inspection system. The PIC assembly language would be used to explore management module of engine and control module, and the Visual Basic to the computer inspection system.In order to test the reliability and real-time ability of ECU software, the engine simulative experiment has been carried out on the oil pump test-rig. The test result is that ECU could commendably attain the aim of data collecting, processing and independent logic controlling of respective cylinder under three different electric control modes, including single chip, computer and real-time controlling modes.更多还原