Abstract: An arrangement for and a method of detecting a beginning of injection in an internal combustion engine wherein an injection pressure is sensed by a pressure transducer and a pressure signal generated thereby is compared with a threshold pressure signal which is formed from a peak value of the injection pressure signal of the preceding injection period, and an injection signal is generated when the injection pressure exceeds the threshold pressure.

Abstract: A system for controlling injection time points and quantity of the fuel injection in a self-igniting internal combustion engine includes a transmitter of reference pulses (R) coupled to a crankshaft and a transmitter of speed pulses (D) and of a synchronizing pulse coupled to the camshaft. From the distance of two speed pulses immediately preceding a reference pulse, a measuring interval and instantaneous angular speed are determined. The injection time point is computed as a function of the instantaneous angular speed and of engine variables. By means of the synchronizing pulse, the measuring section and the reference pulse are assigned to a corresponding cylinder.