INTERNAL COMBUSTION ENGINE TORQUE MEASUREMENT DEVICE AND METHOD

摘要

A method comprising the steps of sensing the movement of each tooth (14, 16) of an engine flywheel past a sensor (22); measuring (30) the passage time di of each tooth; forming a measurement horizon extending beyond both ends of the angular range for ignition strokes; dividing the measurement horizon into eight sets of teeth of equal length, including six for the angular range for ignition strokes; measuring (36) the passage times of the eight passing sets and assigning them a rank in the measurement horizon du-1, du0, ..., du5, du+1; calculating (42) the period of the ignition strokes T = du0 + du+1 + du2 + du3 + du4 + du5; calculating (46) a term Qc = 2du0 - du-1 - du2 - du3 - du+1 - 2du5; calculating (50) a term Dc = p.Qc where p = pi /2 2ROOT 3, a constant stored in a memory (52); and calculating (54) the torque to be determined using the relationship Cgc = A.Dc/T<3> + B/T<2>, wherein A and B are constants stored in a memory (56).