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:
Mar. 21, 2006
Filed:
Mar. 23, 2005
Michael J Prucka, Grass Lake, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
Zhong LI, Westland, MI (US);
Mark J Duty, Goodrich, MI (US);
Eugenio Divalentin, Brighton, MI (US);
Michael a Bonne, Leonard, MI (US);
Michael J Prucka, Grass Lake, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
Zhong Li, Westland, MI (US);
Mark J Duty, Goodrich, MI (US);
Eugenio DiValentin, Brighton, MI (US);
Michael A Bonne, Leonard, MI (US);
DaimlerChrysler Corporation, Auburn Hills, MI (US);
Abstract
A method for controlling airflow in an intake manifold of a multiple-displacement engine during an engine displacement mode transition includes determining, before a displacement mode transition, a post-transition mass air flow rate necessary to maintain a pre-transition engine torque output, as well as an airflow transient multiplier based on engine speed and an estimated post-transition manifold air pressure. After multiplying the requested mass air flow rate with the transient multiplier, the resulting compensated requested mass air flow rate is divided by a maximum mass air flow rate to obtain a requested percent airflow. The percent airflow is thereafter used with engine speed to determine a requested post-transition manifold air pressure-to-barometric pressure ratio, for example, using a lookup table; and the requested post-transition pressure ratio is used to determine a transient post-transition throttle position, to which an engine throttle will be moved upon initiating the displacement mode transition.