Gm Global Technolgoy Operations, Inc.

Steven L Piedmont

Mark T Schluentz

Jon P Owejan

Daniel J Darga

Jerry William Kortge

Seth D Valentine

Charles Mackintosh

Sitima R Fowler

A pressure sensor for measuring a pressure of a fluid in fluid flow path of a fuel cell system is disclosed. The pressure sensor includes a housing provided with a communication path formed between the fluid flow path and an interior of the housing, the communication path having a hydrophobic feature to militate against a formation and an accumulation of an undesired material within the pressure sensor.

Pressure sensor for use in fuel cell systems

A fuel cell system is disclosed including a fuel cell stack and pressure sensors, wherein bypass conduits having flow restriction devices disposed therein are provided for bypassing fluids around the fuel cell stack to militate against the accumulation of moisture in conduits in fluid communication with the pressure sensors.

Fuel cell module design for robust pressure measurements in freezing conditions

A fuel cell stack including a bypass is provided. The fuel cell stack includes a plurality of electricity generating cells in the known manner. A bypass is included for reducing the water entering the electricity generating cells of the fuel cell stack. The bypass may comprise at least one bypass cell disposed adjacent the first electricity generating cell in the stack. The bypass cell comprises a pair of separator plates defining an anode side and a cathode side. The bypass cell includes a conductive spacer comprising gas diffusion media disposed between the pair of separator plates. The bypass cell preferably blocks the cathode port on the separator plate. In this manner, the cell is inactive and does not produce electricity. The anode port of the cell remains open and an anode feed flows through the bypass to reduce water provided to the first electricity-generating cell. Alternatively or additionally, the cathode port remains open. Further the bypass may be placed before the cell stack itself.

Fuel cell stack including bypass

A system and method of controlling the purge rate of a fuel vapor collection canister of an internal combustion engine in which the purge flow rate is variably controlled to a maximum rate that is established by the fuel control system based on its ability to maintain a desired air/fuel ratio.

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Macedon, NY, United States of America

Steven L Piedmont