1990-02-01

An Engine and Starting System Computer Simulation 900779

An engine and starting system computer simulation is described. The simulation consists of physically-based models of the engine, battery and starter motor during engine starting. The interaction between the engine dynamics and the starter motor dynamics is shown for two types of starter motors: a series wound-field starter motor and a permanent magnet gear reduction starter motor. The engine dynamics are determined by engine combustion, friction and engine inertia, while the starter motor dynamics are determined by the motor's torque versus speed characteristic, and its effective inertia as seen by the engine.

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