## CI Engine Simple Torque Model

For the simple torque lookup table model, the CI engine uses a lookup table is a function of engine speed and injected fuel mass, ${T}_{brake}={f}_{Tnf}\left(F,N\right)$, where:

• Tq = Tbrake is engine brake torque after accounting for engine mechanical and pumping friction effects, in N·m.

• F is injected fuel mass, in mg per injection.

• N is engine speed, in rpm.