【作者】 李晔；

【导师】 苏万华；

【作者基本信息】 天津大学 ， 动力机械及工程， 2007， 硕士

【摘要】 高压共轨电控燃油喷射系统是柴油机能够达到更好经济性和排放性的关键技术之一,其中电控部分是实现对燃油喷射柔性控制和油压调节的核心。本文作者对高压共轨燃油喷射系统的电控单元ECU和基于微机的柴油机电控开发系统进行了研究。在电控单元ECU的开发中,介绍了ECU的总体结构以及各个模块的主要功能。为节省微处理器的TPU资源,运用MAX7000S系列的复杂可编程逻辑器件和支持该器件的开发软件,结合硬件描述语言,通过设计输入、编译、调试和仿真,完成了喷油器控制信号的产生和逻辑合成,并将程序固化到CPLD中,最后通过了电路实验的验证。DC-DC升压变换器是为提高喷油器电磁阀响应速度而设计的,为了改善变换器输出电压的性能,在仿真结果的基础上,本文对影响DC-DC变换器输出性能指标的参数——储能电容、储能电感、电路工作频率和控制脉宽进行了实验研究,归纳出参数影响升压变换器性能的规律,并在此基础上设计了性能相对最佳的升压变换器。为对电控喷油器和高压油泵的性能参数进行全面正确的评价,获得满足发动机运行要求的喷油压力和喷油量等MAP,同时确定控制策略,作者进行了柴油机电控开发系统的研究。作者利用微机的丰富资源,结合定时卡和采集卡,进行了硬件设计,实现了供油系统参数采集、控制信号产生及合成和功率驱动等功能,并采取了必要的抗电磁干扰措施;本文选用实时的DOS操作系统和C语言、按照模块化设计原则进行软件设计,实现了供油系统参数采集、发动机运行控制和状态参数显示等功能。在此基础上,对电控喷油器进行了标定实验,实验结果表明,该喷油器具有极快的开启响应速度和很小的循环变动。更多还原

【Abstract】 High-pressure common rail fuel injection system is one of the key technologies to enable diesel engine more efficient and cleaner. Electronic control is the most important part to realize fuel injection’s flexible control and fuel pressure’s regulation. The Electronic control unit (ECU) and the development system for diesel engine based on microcomputer are studied in this thesis.The gross structure of ECU and main function of every part are introduced in this thesis. In order to save microprocessor resource, complex programmable logic device (CPLD) of MAX7000S series, the software MAX+plusII and the very high speed hardware description language (VHDL) are used in the research. After design, compilation, debugging and simulation, the hardware circuit function was realized. Finally the program was solidified into the CPLD device and was verified by the circuit experiment. DC-DC power supply unit is used to improve the electromagnetic response of the injector. To improve unit’s performance, three parameters (capacitance, inductance and circuit frequency) and the control pulse are investigated by experiment based on the simulation result. The effects of these parameters on unit performances are concluded. The injection rate of injector and electromagnetic response is studied for different units.The Electronic control development system for diesel engine is designed to evaluate the performance of injector and high pressure fuel pump, also to obtain the required MAP. The function of signal acquisition, control signal generation and power drive is achieved through hardware design. Many measures of anti electromagnetic interference are also considered. According to the principle of modularization, the modules of engine control, display and pressure acquisition are accomplished. The calibration results of the injector reveal that the injector has satisfying linearity, small cyclical fluctuation and very high speed opening response.更多还原