Control system for an internal combustion engine and/or motor vehicle

Claim 1

A digital control system for an internal combustion engine of a motor vehicle, the system comprising: an electrically actuable element for influencing an operating variable of the engine; a control unit for acting on said element with a pulse-shaped drive signal having a series of pulses to influence said operating variable; said control unit including a computing unit for generating said pulse-shaped drive signal; sensor means for detecting a plurality of measured values at each of a series of predetermined scanning time points; each pulse of said pulse-shaped signal being defined by a changeable pulse width (y) and a fixed period (T); means for computing said pulse width (y) in dependence upon at least one of said measured values at each scanning time point (t i ) and with the time interval of two scanning time points being small relative to said fixed period (T) of said pulse-shaped signal; and, said computing unit including mans for correcting a pulse end time point of a current pulse in correspondence to the last computed pulse width (y i ) while said control unit emits said current pulse in correspondence to the computed pulse width preceding said last computed pulse width (y 1-1 ) to be corrected.