The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy

Abstract

<div class="htmlview paragraph">In the way to seek a marked reduction of NO<sub>x</sub> just by EGR which was proved to be the best answer from the past studies, this analytical study deals with combustion around the practical engine stability limit.</div> <div class="htmlview paragraph">The results show that practical engine operating stability limit with the four cylinder engine is determined by the occurrence of several percent of slow burn.</div> <div class="htmlview paragraph">Experiments applying short combustion duration (fast burn) showed that the fast burn in combination with heavy EGR improves engine stability and has a potential to achieve substantial reduction in NO<sub>x</sub> emission along with some improvement in fuel economy. This potential was also directed by mathematical model study.</div> <div class="htmlview paragraph">This fast burn concept was embodied in the newly developed Nissan Z Fast Burn Engine.</div>