Dynamics and Equivalent Damping of the Fuel Control System of the Pneumatically Covered Compression -ignition Engine

Abstract

An equation describing the dynamic behavior of a fuel control system of the pneumatically governed engine is derived, and its equivalent mass, damping, and effective diaphragm area were revealed. Moreover, it is shown that a simplified equation using equivalent damping coefficient can be used at idling where low speed hinting occurs. From the results of experiments and calculations, the effects of a liaison pipe and a chamber of reduced pressure on damping were made clear. The equivalent damping coefficient of the fuel pump with a chamber 50cm³ in volume equipped with a liaison pipe 8mm in diameter and 40cm long is twice that of the pump without chamber and pipe.