Abstract: A fuel supply system for internal combustion engines includes a fuel reservoir adjacent the induction manifold from which fuel is aspirated depending on pressure differences in two separate regions of the manifold.An electric controller reacts to engine rpm and exhaust gas composition signals to actuate electromagnetic valves in the air conduits leading from the manifold to the fuel reservoir. Various valve opening schedules can be performed depending on the desired fuel mixture.

Abstract: An apparatus for the detoxification of exhaust gases of an internal combustion engine having a fuel metering mechanism, such as a carburetor, which meters out fuel corresponding to the air quantity, is described. An air quantity measuring device is provided which controls the metering mechanism so as to achieve a slightly enriched fuel-air mixture. Thus, the air number (.lambda.) is initially maintained at less than 1, the air number 1 designating a stoichiometric fuel-air mixture. Secondary air is admitted via a secondary air pump, an oxygen sensor being disposed on the exhaust side, until such time an optimum of fuel-air mixture is reached. The secondary air is admitted into the suction tube of the internal combustion engine downstream of the air measuring device.

Abstract: A fuel metering system for an internal combustion engine meters out fuel in dependence on the pressure in a fuel supply container. This pressure is controlled by a valve or valves which provide communication with different regions of the induction tube of the engine. The control valves are electro-magnetic valves under the control of a suitably processed and amplified signal from an exhaust gas measuring probe which determines the concentration of oxygen.

Abstract: A fuel-metering system adapted for attachment to an air-intake suction tube, having a throttle passage therein, of an internal combustion engine having an exhaust for waste gases, which system comprises:A. a fuel reservoir having an airspace above the fuel therein,B. structure for measuring the air pressures in the airspace and the suction tube and for metering fuel amounts to be introduced into given amounts of air flowing through the suction tube, in dependence on the air pressures, andC.