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:
Oct. 14, 2008
Filed:
May. 11, 2007
Roger Hälleberg, Nacka, SE;
Roger Hälleberg, Nacka, SE;
Scania CV AB (publ), , SE;
Abstract
A method for adjusting an on-time calculation model or a lookup table used for determining on-time values for an injector of a cylinder in a combustion engine useful in a motor vehicle, where the injector is connected to a fuel accumulator. The method comprises the steps of injecting a test fuel quantity exceeding the maximum allowed fuel injection quantity under such conditions that no ignition of the injected fuel takes place; measuring the pressure drop in the fuel accumulator during the test injection; establishing the actual fuel quantity injected during the test injection based on the pressure drop; performing a comparison based on the actual fuel quantity or the corresponding on-time value established with the aid of the on-time calculation model or the lookup table; and adjusting the on-time calculation model or lookup table in dependence on the result of the comparison. An apparatus which performs the method. A computer program to perform the method.