Engine Dynamics A sample of power and torque performances for a spark ignition engine

If we use to indicate the angular velocity, measured in [ rad/ s], at which the engine power reaches the maximum value PM , measured in [W = Nm/ s], then for spark ignition engines we use

For exampel

Driveline component

Gearbox and Clutch Dynamics

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Assume the torque-speed equation of a car is similar to Equation that is a second degree of speed having the gear ratio n = ni as a parameter.

Gearbox stability condition.

For exampel

Cg=?

Gearbox Design

To determine the middle gear ratios there are two recommended methods:

Geometric Ratio Gearbox Design When the jump of engine speed in any two successive gears is constant at a vehicle speed Step jump The range (ω1, ω2) is called the engine’s working range.

Speed span

Progressive Ratio Gearbox Design

EXAMPEL