METHOD FOR ESTIMATION OF INDICATED MEAN EFFECTIVE PRESSURE FOR INDIVIDUAL CYLINDERS FROM CRANKSHAFT ACCELERATION

摘要

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