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:
Jan. 01, 2013
Filed:
Mar. 27, 2009
Loren Christopher Dreier, Southern Pines, NC (US);
Loren Christopher Dreier, Southern Pines, NC (US);
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method and system for automated manual transmission shift methodologies for coasting conditions are disclosed. A coast condition is detected in a vehicle having a transmission that couples prime mover power from a transmission input to a transmission output at a plurality of different gear ratios. A target gear ratio is selected based on the power loss attributes associated with each gear ratio. Each gear ratio is associated with a power loss attribute indicative of a power loss between the transmission input and transmission output when prime mover power is coupled from the transmission input to the transmission output using that gear ratio. The transmission is shifted from a current gear ratio to the target gear ratio if the target and current gear ratios differ. By selecting the target gear ratio, vehicle fuel efficiency is improved, while keeping the vehicle under constant prime mover braking or continuous prime mover control.