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:
Feb. 20, 2007
Filed:
Oct. 25, 2005
Roger K Vick, Troy, MI (US);
Michael J Prucka, Grass Lake, MI (US);
Timothy a Coatesworth, Lake Orion, MI (US);
Denise M Kramer, Macomb, MI (US);
Eugenio Divalentin, Brighton, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
Roger K Vick, Troy, MI (US);
Michael J Prucka, Grass Lake, MI (US);
Timothy A Coatesworth, Lake Orion, MI (US);
Denise M Kramer, Macomb, MI (US);
Eugenio DiValentin, Brighton, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
DaimlerChrysler Corporation, Auburn Hills, MI (US);
Abstract
A residual ratio factor characterizing the amount of residual exhaust gas left in a selected cylinder at the end of a piston intake stroke is determined from tabular and surface models based on previously gathered dynamometer data from a test vehicle at various engine speeds. The residual ratio factor is then used to calculate the mole fractions of air and residual exhaust gas in the selected cylinder, which, in turn, are used to determine mass airflow at an engine intake port at the end of the intake stroke. The mass airflow can then be used to derive further models for determining an engine operating parameter, such as fuel/air ratio, required for achieving at preselected vehicle operating condition.