Simulation of the Behavior of a Flow Control Device for the High Pressure Fuel Injection Pump of a Spark Ignition Engine 1999-01-0562

The paper presents some aspects concerning the working process of an original cyclic dose governor, used for the in-line fuel injection pumps of the direct injection spark ignition engines.

Regarding this mechanism as an automatic regulation system, depending of the crank speed and using the transfer functions which are specific to each element, we have obtained the equations that describe the working process of the governor. In order to integrate the system's characteristic differential equations numerical methods were applied, using the LTITR function (Linear Time Invariant Time Response Kernel), adapted from MathLab's 4.2 library. Thus we have obtained graphical representations of the function that describes the governor's response to the engine's speed variation, for the whole speed range of a spark ignition engine and for the 12 dimensional variants of the governor's constituent parts. Analyzing these charts we were able to determine the main indices that describe the dynamic behavior of the governor.