The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1999
Filed:
Nov. 03, 1997
Glenn Alden Zimlich, Dearborn Heights, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method and system for generating an inferred EGO sensor signal for use in monitoring operation of a catalytic convertor in an asymmetrical Y-pipe vehicle exhaust system utilizes current engine airflow and engine speed readings as address inputs for a look-up table of predetermined time delay values. The addressed time delay values are used to retrieve previously stored upstream EGO sensor signals corresponding to the time delay values. An inferred EGO sensor signal is then generated based on the retrieved EGO sensor signals, thus providing an inferred EGO sensor signal which accounts for the exhaust transport delay down the different respective exhaust pipe legs.