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:
Jun. 18, 2024
Filed:
Dec. 01, 2021
Daf Trucks N.v., Eindhoven, NL;
Jan Klaas Bernard Gillot, Heeze, NL;
DAF Trucks N.V., Eindhoven, NL;
Abstract
According to the invention, a diagnostic method is provided for diagnosing a misfire condition of individual engine cylinders in a turbocharged diesel engine having at least a first and a second cylinder. The diagnostic method is characterized by defining a group of diagnosing functions (f1 . . . fn), each having as inputs a number of subsequent sampling pressure values (p1 . . . pm) and having as output a threshold characteristic (t1 . . . tn) diagnosing a misfire condition; determining an error function (e1 . . . en), which is a function of measured false fails and false passes for said diagnosed misfire condition by said diagnosing function (f1 . . . fn), in each of an engine speed region, ranging from a lowest engine speed (rlow) to a highest engine speed (rhigh), for selected engine speed range intervals (s1 . . . sl), and selecting a diagnosing function fi from the group of diagnosing functions (f1 . . . fn), where in fi having an error function ei that is lowest over the entire speed range ([rlow-rhigh]). The number n of diagnosing functions (f1 . . . fn) in the group of diagnosing functions can be more than 7.