US 4,327,691 AGranted

Air-fuel-mixture forming device for spark ignition internal combustion engines

AssigneesFranz Moser, Hans Peter Lenz

InventorFranz Moser

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Abstract

Internal combustion engines utilizing conventional carburetors have auxiliary devices such as a choke and accelerator pump which cause over-rich mixture and consequently affect the fuel consumption and exhaust gas emissions adversely. The present invention improves the performance of such engines whilst retaining the advantages of conventional carburetors. The invention provides a spark ignition carburetor equipped engine with an electromagnetic injection valve disposed in the induction manifold for the supply of additional fuel when required. Actuation means for the electromagnetic injection valve are preferably electronic devices which comprise a pulse generator and measured valve transmitter (sensors) for each of the engine operating parameters relevant to the injection of additional fuel, thus the timing and duration of opening of the injection valve is controlled precisely.

Claims11

Dependent claims

In a multi-cylinder internal combustion engine which includes a carburetor, a fuel pump, first pipe means for supplying fuel from said fuel pump to said carburetor, and an induction manifold, including branch pipes, connected between the carburetor and the cylinders in the engine for delivering fuel thereto, said carburetor including a throttle valve and said induction pipe including a portion between the carburetor and the branch pipes which includes means for heating the inside of said induction pipe to create a hot spot, the improvement wherein

an electromagnetic fuel injection valve is connected to said induction manifold between said carburetor and said branch pipes,
a second pipe means is connected between said first pipe means and said fuel injection valve for supplying fuel to said fuel injection valve, and
an electrical control means is connected to said electromagnetic fuel injection valve for causing said valve to inject fuel into said induction manifold based on at least one operating parameter of said engine, said electrical control means including a pulse generator, at least one sensor element attached to the engine so as to sense a different operating parameter, and a separate electrical pulse modifier means connected with each sensor element, each said electrical pulse modifier means also being connected to said pulse generator to receive a pulse therefrom, and each said electrical pulse modifier means operating to provide a pulse capable of controlling the operation of said fuel injection valve based on signals received from the associated sensor element.

Dependencies are inferred from the claim text.