Circuit controlling injection valves of IC engine - with amount determination circuit for fuel injected which specifies control pulse length of injection valves depending on RPM of engine and other parameters

For the compensation of a varying relative angular setting of the shafts (KW,NW), resulting operationally and/or positionally specific, during one or more revolutions, between the crankshaft (KW) and the camshaft (NW) of the IC engine (5). The value representing the crankshaft rpm (nKW) supplied to the amount determination circuit (2) is corrected by means of a correction factor (K). The corrected crankshaft rpm (n star) is determined according to the equation;- n star = nKW.K whereby nKW is the crankshaft rpm and K is the correction factor. For the determination of the correction value (K), the actual camshaft rpm (nFORD NW) in the delivery time period (tFORD) of the corresp. injection valve, is determined and is placed in the relationship for the crankshaft rpm (nKW). USE/ADVANTAGE - Circuit arrangement for control of injection valves of IC engine. Dependent on operation and position specific variables, continuously respectively correct control pulse lengths are determined and associated correct amounts of fuel are injected.