495电喷汽油机标定系统设计及试验研究

【作者】 孙俊；

【导师】 吴锋；

【作者基本信息】 浙江大学 ， 动力机械及工程， 2005， 硕士

【摘要】 电控技术是降低发动机排气污染,提高其动力性和经济性的一个重要手段,它的研究和开发越来越受到人们的重视。在电控系统的开发、应用过程中,为了使发动机获得较好的动力、经济性能,满足国家的排放法规,保持良好的工作稳定性,需要对发动机的电控单元(ECU)与发动机进行调试匹配,对控制参数进行标定和优化。这些工作需要借助标定系统才能实现。 本文在对国内外电控发动机标定系统深入研究的基础上,研制了一套电控发动机标定系统,系统由开发用ECU、通讯单元、PC机软件等几部分构成。重点对开发用ECU和通讯单元软、硬件以及主控PC机软件进行了设计。在对系统软、硬件干扰做深入分析的基础上,完成了标定系统软、硬件的抗干扰设计。 系统采用主控PC机以串行通讯方式对发动机控制参数进行优化。通讯单元和开发用ECU共享一片双端口RAM,利用双口RAM可以从两边端口同时访问的特点实现了数据的高速交换。通讯单元接收主控PC机命令,修改和优化ECU控制参数及相关的控制标志,同时还将ECU中的发动机状态参数发送到主控PC机。主控PC机可将发动机状态参数和控制参数以电子表格形式存储起来,便于进一步处理。 利用研制的电控发动机标定系统在495汽油机上进行了初步匹配试验,完成了基本Ve值脉谱图,和基本点火提前角脉谱图的制取,并测取了部分工况点的排放数据,验证了系统的功能。更多还原

【Abstract】 The development and study of engine electronic control technology is paid more and more attention. Electronics is regarded as one of the most important method to reduce the exhaust emissions and improve the power and economy performance. To get the best control parameters and find the control strategy of the engine, a large amount of matching experiments between electronic control unit and engine should be done. To finish this work, a calibration system is needed.Based on studies of the calibration system of electronic control engines, the author put forward a calibration system based on dual port RAM and serial communication, which emphasis is the hardware and software design and it’s function testify.In this system the PC can modify the control parameters through the communication unit and receive state parameters of the engine and show them on screen in time. The communication unit adopt a dual port RAM is used in the system, it act as a bridge of electronic control unit and PC, through it the system can modify control data online with high speed and reliability.The function modularization is used in software design of the system to simplify the later expansion and transplantation of the system.The matching experiment is done by applying the system in the 495 gasoline engine. The results of experiment indicate the system can attain expected function and fulfill the optimization and matching test between electronic confrol mat and engine effectively.更多还原