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:
Aug. 31, 1999
Filed:
Nov. 18, 1997
Mark J Poublon, Utica, MI (US);
Michael W Weglarz, Macomb Township, MI (US);
Chrysler Corpoation, Auburn Hills, MI (US);
Abstract
A method for monitoring the efficiency of a catalytic converter in a motor vehicle includes the steps of determining if at least one predetermined condition is met for monitoring the efficiency of the catalytic converter. The method includes biasing a fuel feedback multiplier of an internal combustion engine of the motor vehicle to run rich or lean if the at least one predetermined condition is met. The method includes counting a number of switches across a predetermined switch point from an upstream oxygen sensor and a downstream oxygen sensor. The method includes calculating a switching frequency ratio based on the count of the switches from the upstream oxygen sensor and downstream oxygen sensor and using the switching frequency ratio to establish the efficiency level of the catalytic converter.