Engine Model

Symbols used:
Engine Speed [State]
Transmission Ratio
Engine Inertia
Transmission RPM
Engine Torque
Transmission Inertia

The engine is modelled as a black-box that produces a torque based on the current throttle position (input) and engine speed (state). The rotational inertia of all the rotating components of the engine is lumped in . The torque to accelerate the engine’s rotating components is the difference between the torque the engine produces, and torque reacted by the clutch. Hence the derivative of the engine speed is given by:

The engine torque is:

is interpolated from a 3-D spline that is an input in the .pwr file.