Apparatus for determination of fuel-air ratio of gas mixtures

Claim 1

APPARTUS FOR INDICATING THE FUEL-AIR RATIO OF COMBUSTIBLE GASES SUPPLIED TO AN INTERNAL COMBUSTION ENGINE COMPRISING AN ELECTRICAL BRIDGE CIRCUIT INCLUDING AT LEAST TWO PARALLEL BRANCHES, RESISTORS IN EACH BRANCH, AND MEASURING MEANS FOR MEASURING POTENTIAL CHANGES IN SAID RESISTORS; A SOURCE OF GAS CONTAINING OXIDIZABLE CARBON CARRYING SUBSTANCES; AN AIR SOURCE; AN OXIDIZER; A PUMP FOR MIXING TOGETHER AIR AND GAS FROM SAID SOURCES IN A PREDETERMINED RATIO AND FOR MOVING SAID AIR-GAS MIXTURE TO SAID OXIDIZER FOR OXIDATION OF SAID CARBON CARRYING SUBSTANCES; A GAS OUTLET; A FIRST CELL ENCLOSING A RESISTOR OF ONE BRIDGE BRANCH; CONDUITS CONNECTING SAID AIR SOURCE TO SAID FIRST CELL, SAID FIRST CELL TO SAID PUMP AND SAID GAS SOURCE TO SAID PUMP; SECOND CELL ENCLOSING A RESISTOR OF ANOTHER BRIDGE BRANCH; A DISCHARGE CONDUIT FROM SAID PUMP HAVING A SINGLE OUTLET CONNECTED TO SAID OXIDIZER; A DISCHARGE CONDUIT FROM SAID OXIDIZER HAVING A SINGLE OUTLET CONNECTED TO SAID SECOND CELL; AND A CONDUIT CONNECTED FROM SAID SECOND CELL TO SAID GAS OUTLET.