Diesel Engine Performance Improvement by Closed-loop Injection System

Abstract

The needs for precise combustion control are continuously growing now to realize a higher level compatibility between attractive performance (e.g.higher heat efficiency, higher torque, etc.) and environmental protection requirement. To control combustion, i.e. to design heat release rate, we consider that following 3 factors are important, i) design freedom, ii) compensation, and iii) robustness. We developed intelligent Accuracy Refinement Technology (i-ART) to accomplish these factors for injection rate control. It is the world’s first system that realizes closed-loop fuel injection control by direct detection of the injection pressure using a pressure sensor built-in to the injector. In this paper, the importance of injection rate feedback technology to achieve precise combustion control is discussed.