3768259 is referenced by 84 patents and cites 9 patents.

A control system for an engine system which utilizes solid oxygen-ion electrolyte oxygen sensing means to generate an electrical signal responsive to the oxygen content of exhaust gases of the engine which in turn is used to control regulating means to vary the character of the exhaust gases issuing from the engine. In a preferred embodiment, the oxygen sensing means is disposed upstream from a catalytic reactor and this establishes means to control the nature of the gases entering such reactor in order to maximize the effect of said reactor. Specifically, the oxygen-ion electrolyte oxygen sensing means may comprise a first and second electrode means connected to the regulating means and spaced by a stabilized solid oxygen sensitive electrolyte, such as zirconia stabilized with calcia, with the first electrode means being in communication with the exhaust gases and the second electrode means being in communication with a reference gas such as atmospheric air.

Control for an engine system
Application Number
Publication Number
Application Date
July 6, 1971
Publication Date
October 30, 1973
Spielberg David H
Youtsey Karl J
Carnahan Robert D
Universal Oil Products Company
G01n 27/46
F01n 03/14
F02b 75/10
F02D 09/00
F01N 03/20
F01N 03/22
F02D 41/14
F01N 07/00
G01N 27/406
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