Fuel supply system

Claim 1

In a fuel supply system for mixture-compressing, externally ignited internal combustion engines, in whose suction tube a measuring member and an arbitrarily actuatable throttle flap are sequentially disposed and wherein the measuring member is moved in proportion to air quantity flowing through the suction tube and against a preferably substantially constant resetting force, which air quantity displaces a movable part of a quantity divider valve which meters an amount of fuel proportional to the air quantity and wherein the resetting force is provided by a pressurized fluid which acts continuously upon a control slide with a preferably constant pressure which is delivered through a pressure line, and wherein the pressure of the fluid is changeable by at least one pressure control valve wHich can be controlled in dependence on at least one motor operating parameter and which includes a heatable control element operating in a temperature-dependent manner, the control element being embodied as a bimetallic spring connected to a heat conducting arm which is heated by a heating element immediately after motor start-up and which is thermally insulated from the environment, the bimetallic spring acting in opposition to the force of a first control spring of the at least one pressure control valve whenever the temperature is below the motor''s operating temperature the improvement comprising pressure sensitive means responsive to atmospheric pressure; and a second control spring installed to act in parallel to said first control spring, the pretension of said second spring being changeable in dependence on atmospheric pressure as sensed by said pressure sensitive means, said second spring being coupled to said pressure sensitive means.