Delphi Automotive Systems Luxembourg S.a.

Borgwarner Luxembourg Operations Sarl

Michel Peters

Philippe Bovi

A method of controlling a vehicle engine comprising estimating a value for the actual engine torque, comparing this with a further calculated (expected) torque value, and controlling the engine consequent to said comparing, the value for the actual engine torque being determined from the following steps: ⋅a) from a crankshaft signal, providing a plot or signal indicative of instantaneous crankshaft speed; ⋅b) differentiating said plot or signal indicative of instantaneous crankshaft speed with respect to time to determine acceleration values; ⋅c) within a crankshaft/time interval, determining a maximum and a minimum acceleration value from step b); ⋅d) determining the difference between said maximum and minimum acceleration values; ⋅e) determining a torque value dependent on said difference from step d).

Method of determining engine torque

A method of determining the acceleration of a crankshaft of an internal combustion engine including one or more cylinders, with respect to each combustion event, n, among a plurality of combustion events, includes a) providing a signal indicative of crankshaft speed, with the signal including a series of minima and maxima speeds with respect to each successive combustion event and b) determining the acceleration of the crankshaft of the internal combustion engine with respect to each combustion event, n, among the plurality of combustion events, based on an initial speed value of a minima, Min (n) just before the combustion event, n, and a subsequent speed value of a maximum, Max (n) immediately subsequent to the combustion event, n, in addition to a speed of a minima for a subsequent combustion event, Min (n+1).

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Luxembourg, Luxembourg

Michel Peters