Process for regulating the injection quantities of injectors of a fuel-injecting internal-combustion engine

摘要

In a process for regulating the injection quantities of injectors which are fluidically connected with a common pressure line in a common-rail injection system of an internal-combustion engine, a fuel pump provides fuel in the pressure line under a static nominal pressure. Control signals for opening and closing within individual injection periods for achieving respective identical injection quantities are supplied to the injectors by a regulator unit. In the case of different flow rates of the individual injectors respective identical injection quantities are achieved by the regulator unit by changing the respective injection period on the basis of a measuring signal. For this purpose, a pressure gauge inserted into the pressure line generates a measuring signal from a measurement of the static measuring pressure in the pressure line in each case after the closing of an injector. From the difference between the nominal pressure before the injection and the differential pressure after the injection, the regulator unit determines the fuel quantity taken from the pressure line during the injection. In case of a deviation from a known desired value, the regulator causes a corresponding change of the injection period of the diagnosed injector.