Pierburg Gmbh & Co Kg

Georg Habel

Karl Schmidt

Hans-Jurgen Muller

Asoke Chattopadhay

Ortwin Wittman

Rolf P Heidemanns

Gunter Kronen

Heribert Heisig

Asoke Chattopadhayay

Rolf-Peter Heidemanns

Hans-J/u/ Rgen M/u/ Ller

A fuel supply system for a mixture-compressing internal combustion engine employs a controllable differential pressure for the removal of air from a main air duct into a carrier air duct for proportioning the fuel to be used. The fuel system includes a fuel proportioning device and a vane pump for withdrawing a carrier air flow from the main air duct and for transporting the fuel through feed lines to the internal combustion engine. The pressure of the air at the fuel outlet and the differential pressure for fuel proportioning is controlled by a differential pressure valve located in the carrier air duct spaced from the main air duct. The differential pressure valve has a diaphragm dividing the interior of the valve into chambers with one side of the diaphragm acted upon by the air pressure in the carrier duct between the differential pressure valve and the main air duct. The other side of the diaphragm is acted upon by the pressure in the carrier air duct downstream from the differential pressure valve and also by a variable force depending on the parameters of the engine. To prevent pulsations in the air flow from disadvantageously affecting the differential pressure valve, the diaphragm in the valve is separated by a partition from a space in which such pulsations are effective. The air pressure in the carrier air duct upstream from the differential pressure valve acts in the space and the partition has a nozzle for admitting the air pressure to the one side of the diaphragm.

Fuel supply system

a fuel system for mixture-compressing internal combustion engines controls the pressure differential of the extraction air required for proportioning the fuel. The system includes a fuel proportioning device and a vane pump for generating a carrier air stream for transporting the fuel into the suction tube of the internal combustion engine. A control valve constructed as a differential pressure valve influences the air pressure at the fuel outlet area and consequently the differential pressure for fuel proportioning. The throttle point is located in the carrier air channel upstream from the fuel proportioning area. A change in differential pressure adapts the mixture composition for various operating conditions. The signal level of the differential pressure is determined by the pressure decrease at the air quantity measuring valve formed as a pivotal flap and reaches the air channel where it is superimposed by the negative pressure, generated by the vane pump, and can be stabilized by the differential pressure valve and can be varied in dependence on motor operating parameters. To generate adequately high signal levels in the higher load range, the carrier air channels open into a Venturi arranged upstream from the main throttle valve. During different operating phases of the engine, various devices make it possible to maintain an adequately high signal value of the differential pressure.

A fuel quantity distributor in which a continuously operating suction pipe injection device is provided with differential pressure valves corresponding to the number of cylinders arranged about the metering unit. The valves maintain the pressure difference of the fuel constant by the metering unit. The valves have, furthermore, a diaphragm which contacts on one side, the delivered fuel. The other side of the diaphragm is exposed to a control pressure. Each of the differential pressure valves is equipped with one of these diaphragms in the form of a metal diaphragm in the plane of the vave seat. A centering ring with a crushing edge for a seal ring, is located in the distributor housing. The metal diaphragm is fixed relative to the valve seat by this centering ring through the use of a cup spring. The diaphragm, moreover, is located in a carrier within the distributor housing. The carrier has a two-part capsule with one half having a diaphragm support ring with inside diameter larger than that of the associated shell of the pressed-on second half of the capsule.

Fuel quantity distributor

Growing community of inventors

Neuss, Germany

Georg Habel