Measuring and testing – Test stand – For engine
Patent
1989-11-30
1991-04-30
Raevis, Robert
Measuring and testing
Test stand
For engine
G01M 1500
Patent
active
050107623
ABSTRACT:
An electrochemical device and method measures the percentage of exhaust gas in the intake air/exhaust gas mixture going to the cylinders of an internal combustion engine. The electrochemical pump cells and a support structure form a restricted volume in communication through an aperture to an ambient of intake air and exhaust gas mixture. Constant current is passed through a first pump cell to cause a portion of oxygen molecules inside the restricted volume to be pumped out. A constant voltage across the second pump cell causes substantially all the remaining O.sub.2 molecules inside the restricted volume to be pumped out. Current flowing in the second pump cell is measured, the current being proportional to the percentage of O.sub.2 inside the restricted volume and hence proportional to the percentage of O.sub.2 in the intake air and exhaust gas mixture, which is a measure of % EGR.
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Logothetis Eleftherios
Soltis Richard E.
Ford Motor Company
May Roger L.
Melotik Lorraine S.
Raevis Robert
Smith Randolph A.
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