Experimental Investigation on Performance of Vehicle Diesel Engine with Sequential Turbocharging System

摘要

To improve the vehicle diesel engine performance at low speeds, experiments on sequential turbocharging (STC) system used on D6114 diesel engine have been investigated in this paper. The brake specific fuel consumption (BSFC) and smoke exhaust of diesel engine are measured in four schemes: with the original turbocharger, with a small turbocharger, with a large turbocharger, with both small and large turbochargers. Then, a new turbocharging method named three-phase sequential turbocharging system is put forward by analyzing and comparing the results. The proving experiment on diesel engine with two-phase sequential turbocharging system shows that the BSFC is reduced maximally about 30g/(kWh) and the decreased top value of smoke emission is approximately 22% in low engine speeds range. Therefore, it is elementarily proved that the STC system can result in significant performance improvement to the vehicle diesel engine.