| 摘要:针对高压共轨柴油机各缸工作不均匀的问题，以CA4DLD18E5高压共轨柴油机为对象，采用缸压闭环控制技术开发了一套由基础控制器(BC)和缸压闭环快速原型控制器(PRPC)组成的缸压闭环控制系统。PRPC采集各缸的缸压，计算燃烧特征参数IMEP和CA50，按缸压闭环控制策略将各缸修正后的喷油正时和喷油脉宽发送给BC，实现缸压闭环控制。PRPC最大运行时间小于200 ms，在BC完成一次喷油控制时间范围之内，满足实时性要求。台架实机验证结果表明:开发的缸压闭环控制系统能有效减小各缸燃烧特征参数变异系数17.8%，达到降低各缸工作不均匀性的目的。 |
| 关键词: 柴油机 缸压闭环控制 控制策略 燃烧特征参数 |
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| Development and Test of In-Cylinder Pressure Closed-Loop Systems forHigh Pressure Common-Rail Diesel Engines |
| Yu Yonghua,Zhang Dongshan,Yang Jianguo |
| School of Energy and Power Engineering, Wuhan University of Technology, Hubei Wuhan 430063;National Engineering Laboratory for Marine and Ocean Engineering Power System, Hubei Wuhan 430063;School of Energy and Power Engineering, Wuhan University of Technology, Hubei Wuhan 430063;Key Laboratory of Marine Power Engineering & Technology, Hubei Wuhan 430063 |
| Abstract:Aiming at the problem of uneven operation of cylinders in high pressure common rail diesel engines, a CA4DLD18E5 high pressure common rail diesel engine was studied. A control system composed of basic controller (BC) and in-cylinder pressure rapid prototype controller (PRPC) was developed based on in-cylinder pressure closed-loop control technology. The PRPC collected the cylinder pressure of each cylinder, calculated the combustion characteristic parameters of IMEP and CA50, and sent the corrected injection timing and injection pulse width of each cylinder to BC according to the closed-loop control strategy of cylinder pressure to realize closed-loop control of in-cylinder pressure. The maximum operating time is less than 200 ms and within the fuel injection operation interval of BC, which can meet the real-time control requirements. The results of bench test show that the developed closed-loop control system of cylinder pressure can effectively reduce the variation coefficient of combustion characteristic parameters of each cylinder by 17.8%, and lower the operation unevenness of each cylinder. |
| Key words: diesel engine in-cylinder pressure closed-loop control control strategy combustion characteristic parameter |
