Title: Internal combustion engine exhaust gas monitoring system

Abstract: To detect substantial deviation of operation of the engine with fuel-air mixtures from stoichiometric relationships, particularly extended operation under very lean or enriched supply mixtures, the exhaust gases are conducted past a first sensor which provides a clearly defined voltage jump upon change of the exhaust gases between reducing and oxidizing state; and, additionally, to a second exhaust gas sensor and preferably to a third sensor, the second and third sensors being, respectively, responsive to the oxygen level in the exhaust gases and to the CO (or hydrocarbon) level in the exhaust gases, respectively, and additionally modifying the relative proportion of fuel and air of the mixture being fed to the engine.

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Inventors: Baresel, Detlef (Stuttgart, DE, US)

Application Number: 882177
Filing Date: 1978-02-28
Publication_date: 1980-03-25
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Class(es): 123/691 73/116, 123/703
Other Classes:
US Patent Ref:

3745768	Jul, 1973	Zechnall et al.	123/32.
3759232	Sep, 1973	Wahl et al.	60/276.
3782347	Jan, 1974	Schmidt et al.	60/276.
3841987	Oct, 1974	Friese et al.	123/119.
3926154	Dec, 1975	Williams	60/276.
4117815	Oct, 1978	Ikevra	60/276.
4127088	Nov, 1978	Ezoe	60/276.

Other Refs:
Primary Examiner: Myhre, Charles J.
Assistant Examiner: Nelli, R. A.
Attorney: Frishauf, Holtz, Goodman & Woodward