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. 05, 2003
Filed:
Dec. 22, 1999
Peter Möller, Mölndal, SE;
Volvo Personvagnar AB, , SE;
Abstract
A diagnostic system in an engine management system is provided for generating a diagnostic trouble code (DTC) to indicate the operational status of a component or a sub-system. The diagnostic system includes a diagnostic function module (DF module) for each DTC or a group of related DTCs associated with a component or sub-system. The DF module includes means for executing an evaluation routine to evaluate a component/sub-system to which the DTC of the specific DF module relates, and a dynamic scheduler for determining which DF module may be allowed to execute an evaluation routine at a particular time. Each DF module includes means for producing a ranking value dependent on the operating status of the component or sub-system being evaluated, a ranking value being generated each time an evaluation routine is performed; means for processing and storing statistical results of the ranking values obtained over a number of evaluation routines; means for evaluating the statistical results to produce evaluated data in the form of either an evaluated no-fault signal or an evaluated fault signal, and means for establishing the priority of the associated evaluation routine, and means for transmitting the evaluated signals to the dynamic scheduler.