US 4,300,502 A · Fuel flow control system for internal combustion engines

Abstract

A fuel economizer system and fuel flow control valve arrangement for an internal combustion engine having a fuel supply tank, a main fuel supply line connecting the tank to the carburetor inlet of the engine, and a fuel pump in the supply line for delivering fuel to the carburetor inlet. The control valve arrangement is located in the fuel supply line between the fuel pump and the carburetor inlet, and includes a first control valve which is automatically incrementally adjusted between closed and open position by a diaphragm motor which is operatively connected to the intake manifold of the engine such that changes in vacuum in the intake manifold automatically adjust the control valve to proportionally increase or decrease the supply of fuel to the carburetor inlet. Connected in parallel with the first control valve in the fuel line to the carburetor is a fuel pressure regulator valve which ensures a predetermined minimum fuel pressure and flow to the carburetor inlet when fuel flow through the first control valve is insufficient to maintain such fuel pressure at the carburetor inlet.

Claims8

Dependent claims

In a fuel supply system for an internal combustion engine including a fuel supply tank, a fuel supply line connecting the tank to the fuel inlet of a carburetor of the engine, and a fuel pump in the supply line between the tank and carburetor for delivering fuel to the inlet of the carburetor;

the improvement therein comprising:
fuel metering valve means located in the fuel line between the fuel supply pump and the inlet to the carburetor and incrementally adjustable between a closed and fully open position, and means operatively associated with said metering valve means for incrementally and automatically adjusting the metering valve means in response to variations in the engine load conditions during operating periods, including acceleration and deceleration of the engine, from a closed position at a predetermined low load condition on the engine while correspondingly increasing the fuel flow therethrough to the carburetor in response to increasing load conditions on the engine above said predetermined low load condition, and
a self-operated pressure regulator valve located in the fuel supply line in parallel with said metering valve means between the fuel supply pump and the inlet to the carburetor for ensuring at least a predetermined minimum fuel pressure and fuel flow to said carburetor independent of operating conditions of the engine.

In a fuel supply system for an internal combustion engine including a fuel supply tank, a fuel supply line connecting the tank to the fuel inlet of a carburetor of the engine, and a fuel pump in the supply line for delivering fuel from the tank to the carburetor inlet;

the improvement therewith comprising:
first and second valve means located in parallel in the supply line between the pump and carburetor inlet for controlling the flow of fuel from the pump to the carburetor inlet;
said first valve means including means for automatically delivering varying amounts of fuel to the carburetor inlet proportionally in response to changes in engine load conditions reflected by vacuum changes therein during periods including acceleration and deceleration of the engine;
and
said second valve means including means operative irrespective of load conditions for automatically maintaining a predetermined minimum fuel pressure and fuel flow to the carburetor inlet when said first valve means does not provide sufficient fuel flow to the carburetor inlet to maintain such minimum fuel pressure at the carburetor inlet.

2 more elements

Dependencies are inferred from the claim text.

Fuel flow control system for internal combustion engines

Life of this patent

Fuel flow control system for internal combustion engines

Life of this patent

Abstract

Claims8