Abstract

Recently it is strongly required to develop the better fuel economy as well as basic power performance based on strict emission legislation. This paper focuses on studies of the engine cooling and ancillaries system among fuel economy factors in the developing stage. Firstly through the analysis of the current specifications, it is assessed whether each components may be designed properly, not overdesigned. Secondly, it is predicted how the fuel economy of each components can be improved. Finally the results are confirmed by vehicle field test equppted with the updatedcomponents. This study found good agreementbetween the prediction and the field test on the vehicle fuel economy improvements of the heavy duty engine vehicle with updated components such as engine cooling and ancilliaries.

Keywords

• Vehicle fuel economy;
• Fuel economy sensitivity;
• Commercial vehicle;
• Cooling system;
• Engine ancilliaries system;
• Parasitic loss

• 차량연비;
• 연비민감도;
• 상용차;
• 냉각계;
• 엔진부대장치;
• 소모동력;