摘要
压燃式天然气发动机不仅压缩比高,具有高的热效率,而且HC的排放量也很低,目前国内外都积极开展这一领域的研究。电控发动机技术得到了越来越广泛的应用,并为传统的发动机带来了变革。现在越来越多的人加入到发动机电子行业中来,更加促进了发动机电子技术迅速地发展进步,发动机结合电子技术已是不争的事实。
本文介绍了天然气工业以及天然气发动机的发展状况,并指出天然气发动机在我国具有很大的潜力。
为实现天然气的压缩点火,作者把柴油机改装成了压燃式天然气发动机,包括供气系统和燃烧系统的改装设计。
首次采用网络图方法,为发动机控制系统开发提供指导,缩短开发周期。根据网络图和作者提出的螺旋改进模型,开发了计算机控制系统,包括系统控制电路设计和程序设计。该系统在DOS下对计算机底层硬件进行编程,因此实时性高,控制精确,可高速采集多路数据,并在线跟踪数据。主要用于压燃式天然气发动机电子控制,发动机标定试验,发动机参数采集和燃烧特性分析。
对计算机控制系统进行了标定匹配试验,并对压燃式天然气发动机的起动性和性能特性进行了一系列的试验。
本文的研究成果为提高发动机控制系统的开发效率提供了新途径;同时也为天然气发动机新的燃烧方式提供了试验基础。
Not only the compression ratio and the efficiency of compression ignition CNGengine are high, but also its HC emission is low. Types of projects about compressionignition CNG engine are researched in a lot of countries including china. Thatelectronic control technology is applied to the engine makes the engine developrapidly. More people it attracts, more rapid it develops. The electronic control systemhas become a necessity for the engine.
The development of natural gas and natural gas engine are discussed in this thesis.Natural gas engine has a good future in china.
Diesel engine was refitted to satisfy the requirements of compression ignitionCNG engine. The refitting included the gas supply system and the combustionchamber.
The idea of network diagram was firstly used in the engine electronic controlsystem. The development period is reduced much than it was to be. According to thenetwork diagram and new software helix model, the author developed a computercontrol system including the hardware and the software. It was programmed underDOS and has a good real-time character. Aided with this system, engine can becontrolled precisely. Beside all above, this system has a high acquisition speed and agood function to display data diagram online. This system is suitable for engineelectronic control, data acquisition and analysis of the combustion character and thesystem calibration.
The computer control system was calibrated according to the requirements of theengine. And also many experiments have been done for the starting character and theperformance of engine.
A high efficient method to develop the engine control system is discussed in thisthesis. Meanwhile it gives more experimental data for compression ignition CNGengine.
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