Importance

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Abstract

A controller for mechanically setting a diesel engine's air/fuel ratio at a stoichiometric value to reduce black smoke emissions by regulating the quantity of fuel injected into a diesel engine's combustion chamber in response to the quantity of air flow to the engine's cylinder consists of an air flow sensor device and a modulator. The air flow sensor device has a venturi tube located along the engine's air intake conduit, and the modulator is in air communication with the venturi tube via a hollow hose. The modulator is located between a fuel control device, such as an automobile's accelerator pedal, and the engine's fuel injection pump. The modulator consists of an outer shell, internal diaphragm, return spring, push-pull rod and air valve system. The diaphragm divides the modulator's interior cavity into a front chamber and a rear chamber which communicates with the venturi tube. The return spring is located in the rear chamber and urges the diaphragm forwardly so as to expand or enlarge the rear chamber and to contract or diminish the size of the front chamber. One end of the push-pull rod, which is generally axially aligned with the return spring, passes through the front of the modulator's outer shell and connects to the diaphragm; and, the other end of the push-pull rod is operatively connected to control levers for the fuel injector and the accelerator pedal. The air valve system is located between the rear chamber and the outer shell of the front chamber, and is operatively connected to the control levers. The air valve system includes a front valve seat, rear valve seat and an air duct which provides air communication between the ambient and the front and rear chambers.

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First Claim