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An Intelligent Wake Up Strategy for Wireless Refueling Unit to Optimize Power Consumption of Fuel Cell Vehicle

IP.com Disclosure Number: IPCOM000029333D
Publication Date: 2004-Jun-23
Document File: 3 page(s) / 104K

Publishing Venue

The IP.com Prior Art Database

Abstract

Fuel cell-powered vehicles will introduce a wireless communication interface system for Hydrogen refueling purpose. The big question yet unanswered is the wake up strategy of the wireless refueling unit (WRU) inside the fuel cell vehicle. Continuous sniffing of UHF (Ultra High Frequency) signal will result in huge current draw and power consumption by the module, which will discharge the battery fast.

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Title: An Intelligent Wake up Strategy For Wireless Refueling Unit to Optimize Power Consumption of Fuel Cell vehicle.

Principle of Operation:

Fuel cell-powered vehicles will introduce a wireless communication interface system for Hydrogen refueling purpose. The big question yet unanswered is the wake up strategy of the wireless refueling unit (WRU) inside the fuel cell vehicle. Continuous sniffing of UHF (Ultra High Frequency) signal will result in huge current draw and power consumption by the module, which will discharge the battery fast. A brief description of the system operation is provided below.

¨       Upon Key OFF, the WRU will wake up. The WRU transceiver will initialize RF transmission.

¨       WRU transceiver will be sniffing for a valid RF reception from a H2 refueling station.

¨       If vehicle does not receive any valid RF signal from a neighboring refueling station, it will shut down the WRU. A debounce limit of three reception attempts will be made to receive a valid RF signal.

¨       If the WRU transceiver receives a valid RF signal from a refueling station, it will compare the received signal strength indicator (RSSI) output to a threshold value stored in the memory. This threshold value is representative of signal strength coming from vehicles in a very close proximity from the refueling station. This introduces the extra robustness necessary to eliminate power consumption of fuel cell vehicles in the neighborhood but not in the refueling station while the key is OFF.

¨       If the received RSSI is greater than stored threshold value, WRU will wake up E...