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:
May. 17, 1994
Filed:
Jan. 14, 1993
Benjamin J Bradshaw, West Midlands, GB;
Russel W Jones, Stratford-on-Avon, GB;
Stuart M Briscoe, West Midlands, GB;
Lucas Industries, , GB;
Abstract
Engine speed variations following combustion events within the cylinders of a multi-cylinder internal combustion engine are compared with a threshold during a predetermined number of combustion events. A distribution of speed variations exceeding the threshold with respect to the cylinders is formed. The distribution is analyzed to determine whether misfire is occurring, as indicated by speed variation following combustion occurring in half or less than half of the cylinders, or whether the vehicle is driving over a rough surface, as indicated by speed variation following combustion occurring in more than half of the cylinders.