Fuel supply assembly for mixture-compressing internal combustion engines and associated methods of operation
AssigneePierburg GmbH
InventorsFritz Ehrhart, Asoke Chattopadhay, Karl Schmidt
Life of this patent
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Abstract
A fuel supply assembly for a gasoline internal combustion engine in which the amount of fuel supplied is controlled by an electromagnetic injection valve which in turn is controlled by an electronic controller subjected to operating parameters. The assembly comprises a fuel metering device and a vane pump in which is supplied a branch stream of air tapped from an inlet duct upstream of the throttle valve. The fuel is introduced into the pump chamber downstream of the air and both the fuel and air are supplied to the pump chamber substantially tangentially to be mixed for the first time in the pump chamber.
Claims16
In a fuel supply assembly for an internal combustion engine having an air intake duct with a throttle valve therein, a branch air duct branching off from the intake duct upstream of the throttle valve, means including an injection valve for supplying fuel in an amount as a function of operating parameters, a pump for conveying the air in the branch duct with the fuel injected by the injection valve as an air-fuel mixture to respective inlet valves of the cylinders of the engine, the improvement wherein said injection valve includes a fuel supply port which opens directly into said pump, said pump having an outlet connected to said air intake duct to supply air-fuel mixture to the inlet valves of the engine via said air intake duct such that each inlet valve receives air from the intake duct and air-fuel mixture from said pump.
A method of supplying air-fuel mixture to an internal combustion engine having an air intake duct with a throttle valve therein, said method comprising conveying air to the engine through the air intake duct under control of the throttle valve, supplying a portion of the air in said air intake duct to a pump via a branch line connected to said air intake duct upstream of the throttle valve, supplying fuel to said pump separately from the air such that the fuel and air first come into contact in the pump and are mixed therein and discharging the air-fuel mixture from the pump to the inlet valves of the engine via said air intake duct, the air in said intake duct being supplied to the inlet valves of the engine along with the air-fuel mixture.
Dependencies are inferred from the claim text.