Ascertaining The Moisture Of A Gas Flow At A Measuring Point Of A Fuel Cell System

A fuel cell system comprising:

• a control unit;
• a first sensor at a measuring point;
• and
• a second sensor a reference point chosen such that a gas stream passing the measuring point and the reference point has an approximately equal hydrogen-to-nitrogen ratio at the reference point and the measuring point;
• the reference point chosen such that the gas stream has a known humidity at the reference point;
• wherein the control unit:
• determines the hydrogen-to-nitrogen ratio of the gas stream at the measuring point using a first sensor, measures the hydrogen-to-nitrogen ratio of the gas stream at the reference point using a second sensor, and ascertains the humidity of the gas stream at the measuring point based at least in part on a difference between the first and the second hydrogen-to-nitrogen ratio.

A vehicle comprising:

• at least one wheel;
• a fuel cell system driving the at least one wheel;
• a control unit;
• a first sensor at a measuring point in the fuel cell system;
• and
• a second sensor at 10 reference point in the fuel cell system chosen such that a gas stream passing the measuring point and the reference point has an approximately equal hydrogen-to-nitrogen ratio at the reference point and the measuring point;
• the reference point chosen such that the gas stream has a known humidity at the reference point;
• wherein the control unit:
• determines the hydrogen-to-nitrogen ratio of the gas stream at the measuring point using a first sensor, measures the hydrogen-to-nitrogen ratio of the gas stream at the reference point using a second sensor, and ascertains the humidity of the gas stream at the measuring point based at least in part on a difference between the first and the second hydrogen-to-nitrogen rat