Title: Improvement of engine transient characteristics using an induction chamber model

Authors: Y. Sogawa, T. Kameoka, F. Matsui

Addresses: Subaru Advanced Engineering Center, Fuji Heavy Industries Ltd, 3-9-6, Ohsawa, Mitaka-shi, Tokyo 181, Japan. ' Subaru Advanced Engineering Center, Fuji Heavy Industries Ltd, 3-9-6, Ohsawa, Mitaka-shi, Tokyo 181, Japan. ' Subaru Advanced Engineering Center, Fuji Heavy Industries Ltd, 3-9-6, Ohsawa, Mitaka-shi, Tokyo 181, Japan

Abstract: Engine transient air-fuel ratio control performance exerts a significant effect on the exhaust gas emissions and the vehicle running performance. Accurate determination of the engine intake air mass is necessary to allow accurate control of the air-fuel ratio in an electronic control fuel-injection system. In this article it is attempted to estimate the cylinder intake air mass by means of an induction chamber model in an L-Jetro multipoint injection system and to carry out fuel injection based on the estimated results, noting the difference between the mass of air that passes through the air flow meter and the actual mass of cylinder intake air, due to the capacity of the induction system. The algorithm for this purpose and its effect are introduced.

Keywords: airflow meter; induction systems; LA-4 mode; L-Jetro system; engine transient characteristics; air-fuel ratio control; exhaust emissions; vehicle performance; cylinder intake air mass; induction chamber modelling; fuel injection.

DOI: 10.1504/IJVD.1989.061550

International Journal of Vehicle Design, 1989 Vol.10 No.5, pp.581 - 591

Published online: 26 May 2014 *

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