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. 07, 2014
Filed:
Dec. 15, 2005
Oliver Maier, Worms, DE;
Sascha Schaefer, Bad Camberg, DE;
Thomas Weispfenning, Ober-Ramstadt, DE;
Peter Willimowski, Darmstadt, DE;
Rolf Isermann, Seeheim, DE;
Oliver Maier, Worms, DE;
Sascha Schaefer, Bad Camberg, DE;
Thomas Weispfenning, Ober-Ramstadt, DE;
Peter Willimowski, Darmstadt, DE;
Rolf Isermann, Seeheim, DE;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A thermal sub-system for a fuel cell system that employs an algorithm using feed-forward control. The algorithm calculates a Reynolds number based on the velocity of the cooling fluid, a diameter of a coolant loop pipe and a kinematic viscosity (temperature) of a cooling fluid. The algorithm also uses a pressure loss number based on the Reynolds number and a position of a by-pass valve. The algorithm also defines a pressure loss value based on the pressure loss number, the density of the cooling fluid and the velocity of the cooling fluid. The algorithm then calculates a delivery head value based on the pressure loss value, the fluid density and a gravitational acceleration. The algorithm then uses the delivery head value and a predetermined set-point value of the volume flow to determine a desired pump speed based on the current operating parameters of the system.