Patent ID: 6714852
Filing Date: 2004-03-30
Classification: F02B,F02D,G05B

Abstract:
An engine crankshaft torque observer comprising:a combustion process model for developing modeled pressure estimates of combustion chamber pressures in engine cylinders according to certain engine inputs that influence combustion chamber pressures; a kinematics model for relating reciprocal motion of pistons in the engine cylinders to an engine crankshaft; an engine friction model for relating running friction of the engine to engine crankshaft rotation; and a processor for processing the certain engine inputs through the combustion process model to develop the modeled pressure estimates, for processing the modeled pressure estimates through the kinematics model to develop modeled positive torque contribution due to combustion processes, for processing the modeled pressure estimates through the friction model to develop modeled torque loss due to running friction, and for processing the modeled positive torque contribution due to combustion processes and the modeled torque loss due to running friction to develop measurement of indicted torque output of the engine, in which the certain engine inputs include a fuel input, an EGR input, and a timing input.