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. 24, 1999
Filed:
Jul. 30, 1997
Patrick Wayne Blosser, East Windsor, NJ (US);
Engelhard Corporation, Iselin, NJ (US);
Abstract
This invention pertains to a vehicular on-board diagnostic emission system in which the system determines whether the vehicle is continuously in compliance with regulatory emission standards by sensing only hydrocarbon and carbon monoxide emissions at a position downstream from the three way catalytic converter. All emission data sensed is correlated to a basic vehicle function, such as speed, and sorted into a number of histograms corresponding to vehicle operating conditions specified by emission regulations. The histograms are sampled in a statistically validated manner to determine if the vehicle complies with emission standards. If a failure has occurred, further histogram diagnostic routines are sequentially implemented to determine which emission system of the vehicle has failed.