Experimental study on the effect of post-injection parameters on performance of extra-high pressure common-rail diesel engine

The diesel engine combustion process is mainly controlled by the fuel injection characteristics, which will have a direct impact on the performance of the diesel engine, more flexible injection strategy is the development direction of high pressure common-rail system. In order to obtain the change law of the performance of extra-high pressure common-rail diesel engine under variable injection strategy, and improve the overall performance of diesel engine, the effect of different post-injection parameters on the performance of diesel engine was studied on a self-designed extra-high pressure common-rail diesel engine experiment bench, and the relevant results were discussed and analyzed. The results show that: with the rise of post-injection fuel quantity, NOx concentration and soot concentration decrease gradually, and with the rise of post-injection interval angle, NOx concentration decreases gradually, while soot concentration first decreases and then increases. Therefore, choosing post-injection fuel quantity and post-injection interval angle rationally can achieve lower NOx and soot emission at the same time. Meanwhile, with the rise of post-injection fuel quantity or post-injection interval angle, the fuel consumption rate presents an increasing trend. (C) 2022 The Author(s). Published by Elsevier Ltd.

Automated summary

The combustion process of diesel engines is controlled by fuel injection characteristics, and a more flexible injection strategy is the development direction for high pressure common-rail systems. This study investigated the effect of different post-injection parameters on diesel engine performance using an experiment bench. The results showed that selecting appropriate post-injection fuel quantity and interval angle can reduce both NOx and soot emissions simultaneously.