Development of a variable controlled inertia charging system for naturally aspirated diesel engines for heavy duty trucks
by N. Eguchi, T. Kubodera, T. Otani, K. Usami
International Journal of Vehicle Design (IJVD), Vol. 6, No. 4/5, 1985

Abstract: A method of controlling the inertia charging effect for the diesel engine has been developed. Though the conventional inertia charging system can provide an effect in a narrow range of driving conditions, the new method covers the whole range of engine speeds and load conditions. A Hino EK 100 naturally aspirated 13.3dm³, engine equipped with this variable controlled inertia charging system could meet the 1983 Japanese exhaust emissions regulations (intensified to 470 p.p.m. of NOx on 6 Mode from the original value of 770 p.p.m. in 1974) while giving improved fuel economy. This 199kW engine is applied to the Hino heavy duty truck named 'New Super Dolphin (Econo Diesel)'. One of the measures that can be taken to offset the deterioration of engine performance caused by the reduction of exhaust gas emission is to improve the combustion characteristics by increasing excess air ratio. Though inertia charging can provide more excess air from the engine, this system has to have some fixed factors, such as tuned pipe length and diameter. So the resonance zone is also fixed within a narrow engine speed range. And, moreover, outside this range, the air quantity is reduced below that without inertia charging. Therefore, variable control of inertia charging with a mechanism to change the tuned pipe length is considered for this system. The intake air quantity is thus controlled to improve engine performance over a wide speed range at both full and partial load. The engine can get a higher brake mean effective pressure of 0.90 MPa at peak torque and can also improve fuel consumption even at partial load by reducing intake air quantity to minimise gas exchange loss.

Online publication date: Sun, 25-May-2014

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