高压共轨柴油机怠速控制策略研究

柴油机由于怠速时供油量较小,各缸供油量不同和每缸供油量的波动很大,在不同的冷却水温下保持稳定转速所需的喷油量不同,会造成燃烧过程恶化、排放性能变差。因此,分析了车用高压共轨柴油机怠速不稳定因素,采取了多种措施,如怠速开环和闭环控制、各缸均衡控制以及多段喷射等来减小怠速时的转速波动和运转噪声,通过试验验证了这些方法的有效性,从而提高了柴油机的怠速性能。

Idle Control Strategy of High-pressure Common Rail Diesel Engine

Under idle condition,the fuel supply quantity was smaller and therefore the difference and fluctuation of fuel supply for each cylinder were noticeable.Under different temperatures of cooling water,the injection quantities of keeping stable speed were different,which made the combustion and emission worsen.Accordingly,the unstable factors of idle for high-pressure common rail diesel engine were analyzed and the methods such as idle open loop control,idle close loop control,cylinder balancing control and mul...