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. 04, 2014
Filed:
Jan. 19, 2007
Jochen Schaffnit, Darmstadt, DE;
Jochen Lenz, Hattersheim, DE;
Peter Willimowski, Rossdorf, DE;
Andreas Voigt, Neu-Isenberg, DE;
Jochen Schaffnit, Darmstadt, DE;
Jochen Lenz, Hattersheim, DE;
Peter Willimowski, Rossdorf, DE;
Andreas Voigt, Neu-Isenberg, DE;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A power request controller that prevents a power request signal to a fuel cell stack controller from providing more compressor air and hydrogen gas than is necessary to meet the current power demands of the vehicle. The stack controller generates a signal of the available current from the fuel cell stack. This signal and the measured current actually being drawn from the stack are received by a proportional-integral (P-I) controller in the power request controller. If the available stack current is significantly greater than the stack current being used, the P-I controller will provide an output signal that reduces the power request signal to the stack controller so that the current produced by the stack and the current being drawn from the stack are substantially the same. A transient detector turns off the P-I controller so that it does not reduce the power request signal during an up-power transient.