Measurement and control of exhaust gas recirculation with an oxy

Details Measurement and control of exhaust gas recirculation with an oxy Measurement and control of exhaust gas recirculation with an oxy

1988-07-22

1990-03-20

Raevis, Robert R.

Measuring and testing

Test stand

For engine

204426, G01M 1500

Patent

active

049090720

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. Two 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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"Closed Loop Control of the EGR Rate Using the Oxygen Sensor", M. Nishida, N. Inoue, H. Suzuki and S. Kumargai, SAE International Congress and Exposition, Feb. 29--Mar. 4, 1988, Technical Paper No. 880133.
"High Temperature Oxygen Sensors Based on Electrochemical Oxygen Pumping", E. M. Logothetis and R. E. Hetrick, Fundamentals and Applications of Chemical Sensors, 1986, American Chemical Society.

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