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:
Jan. 28, 1997
Filed:
Dec. 20, 1995
Christopher P Thomas, West Bloomfield, MI (US);
Timothy A Coatesworth, Lake Orion, MI (US);
Kenneth P DeGroot, Macomb Twp., MI (US);
Jeffery C Ehlers, Davisburg, MI (US);
Mark E McMackin, Royal Oak, MI (US);
Keith L Jones, Woodhaven, MI (US);
Chrysler Corporation, Auburn Hills, MI (US);
Abstract
A method for pulse width modulating a resistance element of an oxygen sensor. The method quickly heats the resistance element of the oxygen sensor soon after start of the engine with a relatively high duty cycle yielding wide pulse widths. During a mid oxygen sensor temperature range, the method decreasing the duty cycle and thereby the pulse width modulation. And, upon the oxygen sensor reaching peak operating temperature range, the method decreases the pulse width modulated voltage signal supplied to the oxygen sensor to relatively short duty cycled pulses.