Abstract: In a system for regulation of the idling speed of an internal combustion engine acting through an electrical positioning means for the minimum-opening position of the throttle valve, the building-up of troublesome fluctuations in engine speed as the result of the characteristics of the regulation loop is counteracted in response to detection of the rise of such fluctuations or of their imminence as the result of an excessively rich mixture (on the basis of the signal from a probe in the exhaust pipe). When such a condition is detected, the amplification factors in the controller stage of the regulation loop are reduced, the reference desired idling speed value is raised and the lower limit of the regulation range is also raised. These parameters are returned to normal when the throttle valve moves away from its idling speed position.

Abstract: An apparatus for fuel metering, in particular supplementary fuel metering, in an externally ignited internal combustion engine by means of a special metering device, in particular an injection valve, wherein the special metering device is triggerable at least from time to time with pulses under special operating conditions such as cold starting, hot starting, or acceleration, or in order to enable emergency operation of the internal combustion engine. To this end, the apparatus comprises, besides the special metering device, a stroke transducer, which depending on the special operating state to be controlled, is connected with the output of the starting switch or with the output of the driving switch of the internal combustion engine or of the vehicle.