Bosch & Pierburg System Ohg

Armin Sch/u/ Rfeld

Wolfgang Jordan

G/u/ Nter H/a/ Rtel

A device for the speed-dependent closing limitation of a selectively adjustable carburettor main throttle, which is prestressed in the closing direction, includes a variably positionable throttle stop for effecting a substantially complete closure of the main throttle above a rotational speed switching threshold higher than the idling speed. Such a closure interrupts the supply of fuel and air. The throttle stop causes an idling minimum opening position of the main throttle below the switching threshold. The device includes an electromagnetic valve which operates when the speed drops below the switching threshold. The electromagnetic valve has a valve outlet and a pair of valve inlets. A diaphragm box divided into separate chambers is mechanically connected with the throttle stop and one chamber is continuously vented. When the speed is above the switching threshold and also when the ignition is turned off the valve outlet is in flow communication with one of the valve inlets. The electromagnetic valve is connected through its outlet with one chamber in the diaphragm box. One of the valve inlets of the electromagnetic valve is connected with the engine intake pipe via a check valve and the other valve inlet is connected with the ambient atmosphere or another pressure source.

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Meerbusch, Germany

Armin Sch/u/ Rfeld