Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-07-05
1976-01-20
Scovronek, Joseph
Chemistry: physical processes
Physical processes
Crystallization
23254R, 60276, 123119R, 123119E, 123140MC, F02M 712, G01N 3110, G01N 3322
Patent
active
039334384
ABSTRACT:
A combustible gas sensor for use in a closed loop fuel control system for a combustion engine comprises a pair of sensor conduits within the main exhaust conduit of the engine, with exhaust gas drawn through one of the sensor conduits and a mixture of exhaust gas and air drawn through the other by engine induction vacuum at controlled rates. A catalyst coated capillary tube within each secondary conduit has air drawn through it at a constant rate. On account of the catalytically induced combustion on its outer surface, the capillary tube exposed to the air-exhaust mixture heats more than the other by an amount dependent upon the concentration of combustible gas in the exhaust. The capillary tubes are connected in series; and the pressure at the junction, when compared with a reference, is a function of the combustible gas concentration. The use of two capillary tubes in each conduit connected in a "bridge" configuration eliminates the need for a separately generated reference pressure.
REFERENCES:
patent: 1959242 (1934-05-01), Kennedy
patent: 2263335 (1941-11-01), Heinz
patent: 2449067 (1948-09-01), Guillemin, Jr.
patent: 3314281 (1967-04-01), Reece et al.
patent: 3730157 (1973-05-01), Gerhold
General Motors Corporation
Scovronek Joseph
Sigler Robert M.
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