Carburetor control system and method for regulating air to fuel ratio

Claim 2

In the operation of an internal combustion engine with a carburetor system, the improved method of operation to make corrective variations in air to fuel ratios and maintain a desired exhaust gas composition, which comprises, providing a pressure source other than atmospheric and remote from the carburetor in communication with the fuel float chamber of the engine carburetor, and adjusting the pressure level on the fuel therein to change fuel flow therefrom responsive to the O2 content in the air stream to the carburetor.

Claim 3

The method of claim 1 further characterized in that the pressure source in communication with the fuel float chamber is the vacuum provided by the intake manifold of said engine.

Claim 4

The method of claim 1 further characterized in that the pressure source in communication with the fuel float chamber comprises a separate low pressure pneumatic supply.

Claim 5

A carburetor control system for an internal combustion engine providing corrective variations in the air to fuel ration so as to maintain a desired exhaust gas composition, which comprises in combination, a gas pressure source other than atmospheric and remote from the carburetor connecting through passageway means to the float chamber of the engine carburetor, an adjustable valving means in said passageway means to regulate pressure to said chamber, a sensor means interconnected into said system, a transmitter means, said transmitter means producing at least one scaled signal responsive to a change noted by the sensor in oxygen content change reaching said carburetor, said transmitter means having a computing relay in interconnection to therewith provide a resulting output signal, and the output signal of said relay being interconnected with said valving means, whereby such output signal effects an adjustment in the air to fuel ratio to said engine.

Claim 6

A carburetor control system for an internal combustion engine providing corrective variations in the air to fuel ration so as to maintain a desired exhaust gas composition, which comprises in combination, a gas pressure source other than atmospheric and remote from the carburetor connecting through passageway means to the float chamber of the engine carburetor, an adjustable valving means in said passageway means to regulate pressure to said chamber, a sensor means interconnected into said system, a transmitter means, said transmitter means producing at least one scaled signal responsive to a change noted by the sensor in oxygen content change reaching said carburetor, said transmitter means having a computing relay in interconnection to therewith provide a resulting output signal, and the output signal of said relay being interconnected with said valving means, whereby such output signal effects an adjustment in the air to fuel ratio to said engine.

Claim 7

A carburetor control system to effect corrective variations in the air to fuel ratio for an internal combustion system so as to maintain a desired exhaust gas composition, which comprises in combination, an air pressure source other than atmospheric and remote from the carburetor connecting through conduit means to the float chamber of the engine carburetor, an adjustable valve means in said conduit means, a multi-function computing relay providing an averaged transmitted power source connecting to said adjustable valve means, and at least two signal connections to said computing relay sensed from atmospheric condition and from an exhaust gas component, each of which shows a change in oxygen content to the carburetor; whereby the effect of at least two signals will be averaged and provide a resulting adjustment in fluid pressure on said float chamber from said valve means.

Claim 8

A carburetor control system to effect corrective variations in the air to fuel ratio for an internal combustion system so as to maintain a desired exhaust gas composition, which comprises in combination, an air pressure source other than atmospheric and remote from the carburetor connecting through conduit means to the float chamber of the engine carburetor, an adjustable valve means in said conduit means, a multi-function computing relay providing an averaged transmitted power source connecting to said adjustable valve means, and at least two signal connections to said computing relay sensed from atmospheric condition and from an exhaust gas component, each of which shows a change in oxygen content to the carburetor; whereby the effect of at least two signals will be averaged and provide a resulting adjustment in fluid pressure on said float chamber from said valve means.

Claim 9

The carburetor control system of claim 5 further characterized in that said computing relay provides a resultant pneumatic output signal connective with said adjustable valve means and said signal connections to said computer relay from said transmitter means are scaled pneumatic signals, whereby said computing relay effects the totalizing of a plurality of pneumatic signals being transmitted thereto.

Claim 10

The carburetor control system of claim 5 further characterized in that said computing relay providing an averaged signal output connecting to said adjustable valve means receives a plurality of weighted electrical signals from each of the plurality of transmitter means, and said computing relay effects the totalizing of such electrical signals to provide a resultant averaged output signal.

Claim 11

The carburetor control system of claim 7 still further characterized in that said power source connecting to said computing relay is electrical whereby there is electrical power regulation of said adjustable valve means.

Claim 12

The carburetor control system of claim 7 still further characterized in that said power source connecting with said computer relay is pneumatic, whereby an averaged pneumatic output signal is transmitted to a pneumatically operated adjustable valve means for regulation of pressure on the float chamber of the engine carburetor.

Claim 13

The method of claim 1 further characterized in that there is provided an increase in pressure level to increase fuel flow responsive to a decreasing CO content in the exhaust gases from the engine and, conversely, decreasing pressure level responsive to an increasing CO content in the exhaust.

Claim 14

The method of claim 1 further characterized in that there is provided an increase in prEssure level to increase fuel flow responsive to an increasing O2 content in the exhaust gases from the engine and, conversely, decreasing pressure level responsive to a decreasing O2 content in the exhaust.

Claim 15

The method of claim 1 further characterized in that there is provided an increase in pressure level to increase fuel flow responsive to a decreasing air temperature and, conversely, decreasing pressure level responsive to an increasing air temperature.

Claim 16

The method of claim 1 further characterized in that there is provided an increase in pressure level to increase fuel flow responsive to an increasing humidity of ambient air and, conversely, a decrease in pressure level for a decreasing humidity.