A Study on Improving Fuel Consumption and Exhaust Emissions of Diesel Engine for Commercial Vehicle

‐Proposal of Supercharging Concept Using Small Turbocharger Combined with Late Intake Valve Closing‐

Abstract

Air management system for high boost and high exhaust gas recirculation (EGR) rate was assumed as a key technology for reduction of fuel consumption and exhaust emissions. The concept of air handling system has been proposed using relatively small turbocharger combined with late intake valve closing. Essence of the proposed concept is an improvement in the disadvantages of high boosting system. The basic ideas of the concept were constructed by simulation and improved fuel economy and emissions reduction were demonstrated using a multi cylinder diesel engine.