Patent ID: 8828615
Filing Date: 2014-09-09
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: at least one fuel cell including an anode inlet and an anode outlet, said anode inlet and said anode outlet being coupled by an anode loop; a source providing hydrogen gas to the anode inlet; an injection device for injecting the hydrogen gas from the source to the anode inlet, said injection device producing an audible injection noise when it injects the hydrogen gas; first and second pressure sensors located in the anode loop and spaced a known distance from each other, said first and second pressure sensors providing signals in response to the injection device producing an audible injection noise when it injects the hydrogen gas; and a controller being responsive to the sensor signals from the first and second pressure sensors, said controller being configured to filter the sensor signals from the first and the second pressure sensors so as to determine a concentration of hydrogen gas in the anode loop based on the time difference between the filtered sensor signal from the first pressure sensor and the filtered sensor signal from the second pressure sensor.