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. 01, 2006
Filed:
Mar. 21, 2005
Michael J Prucka, Grass Lake, MI (US);
Michael a Bonne, Leonard, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
Michael J Prucka, Grass Lake, MI (US);
Michael A Bonne, Leonard, MI (US);
Gregory L Ohl, Ann Arbor, MI (US);
DaimlerChrysler Corporation, Auburn Hills, MI (US);
Abstract
A method for estimating an output torque generated by a multi-displacement engine operating in a partial-displacement mode includes multiplying a measure representing a mass air flow through the engine's intake manifold by a engine-speed-based mass-air-flow-to-torque conversion factor, and thereafter summing the product with a torque offset value likewise based on engine speed data, to obtain a base indicated potential output torque. The base indicated potential output torque is then multiplied with a torque-based efficiency conversion factor representing at least one of a partial-displacement mode spark efficiency, fuel-air-ratio efficiency, and exhaust gas recirculation efficiency, and the resulting product is summed with a torque-based frictional loss measure to obtain the desired estimated engine output torque. The estimated engine output torque is particularly useful in determining whether a transition from the partial-displacement engine operating mode to a full-displacement engine operating mode is desired.