Patent ID: 7623955

Claim:
A method for inferring Indicated Mean Effective Pressure as total transient indicated engine torque in an internal combustion engine, comprising the steps of: a) acquiring at least one crankshaft time stamp for use in determining a cylinder-specific engine velocity; b) calculating an incremental change in engine kinetic energy from the previously fired cylinder (j−1 st ) to the currently fired (j th ) cylinder using said cylinder-specific engine velocity; c) equating said incremental change in engine kinetic energy to a change in energy-averaged cylinder torque (IMEP) from the previously-fired (j−1 st ) to a currently-fired (j th ) cylinder; d) summing a plurality of said incremental changes in engine kinetic energy over time to determine a value of the transient component of indicated torque; e) determining a value of quasi-steady indicated engine torque; and f) adding said value of the transient component of indicated torque to said value of quasi-steady indicated engine torque to yield said Indicated Mean Effective Pressure.