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Measurement and control of exhaust gas recirculation with an oxygen pumping device

Patent ·
OSTI ID:5336151
;
This patent describes an electrochemical device for measuring the percentage of exhaust gas recirculation (EGR) in an intake air and exhaust gas mixture of an internal combustion engine. It comprises: a generally planar first electrochemical pump cell including a relatively dense ZrO{sub 2} platelet with porous platinum electrodes on two sides of the platelet; a first porous ZrO{sub 2} layer deposited on one electrode of the first pump cell; a generally planar second electrochemical pump cell including a first porous platinum electrode, a second porous ZrO{sub 2} layer and a second porous platinum electrode deposited successively on the first porous ZrO{sub 2} layer; a second cell external circuit means coupled to the second pump cell for passing a constant current through the second pump cell so that the second electrode is biased positively causing a portion of the oxygen molecules inside the first porous ZrO{sub 2} layer to be pumped out by the current flowing through the second pump cell; a first cell external circuit means coupled to the first pump cell so that the exposed electrode is biased positively; a third external circuit means coupled to the first pump cell for measuring the current flowing through the first pump cell.
Assignee:
Ford Motor Co., Dearborn, MI (United States)
Patent Number(s):
A; US 5089113
Application Number:
PPN: US 7-670632
OSTI ID:
5336151
Country of Publication:
United States
Language:
English

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Related Subjects

30 DIRECT ENERGY CONVERSION
300504 -- Fuel Cells-- Applications
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
CHEMICAL COMPOSITION
CHEMISTRY
CONTROL
CONTROL SYSTEMS
DISPERSIONS
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MIXTURES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
USES
WASTES