Implementation of an engine controller unit's non-volatile memory for measuring the time of a fuel cell system in a shut-off or standby state
US8349507B2 · kind B2 · utility
0Cited by
3References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 11, 2007 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Feb 3, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for providing an accurate time that a fuel cell system has been shut-down so that the gas constituents in the anode and cathode side of the fuel cell stack can be known for an efficient next system start-up sequence. The method uses two timers, a stand-by timer that provides a time count for how long the fuel cell system has been off, but the vehicle ignition is still on, and a shut-off timer that provides a time count of how long the vehicle ignition has been off. The two time counts are added to give a complete time count of how long the fuel cell stack has been shut-down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.