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The introduction of electronically controlled fuel injection equipment for diesel engines has generated a need for a tool to develop electronic governor control algorithms. It is possible to execute such development by building a flexible control system and experimenting with the control variables on an actual engine, but this is a time consuming and expensive process and the need has arisen for a computer simulation of an engine to expedite such work. Many engine simulations written for such purposes rely on the concept of a fluctuating, but continuous, energy input to an engine which in turn accelerates after a fixed time delay representative of the combustion process and the variable leverage of the connecting rod and crank system. Such a simulation neglects the aliasing errors that can arise if governor actuating frequencies coincide with or exceed fuel injection frequencies, in which case the continuous mode of simulation becomes invalid.