Control Systems Flashcards
1
Q
What needs to be controlled?
A
Humidity, pressure, temperature, and flow rates.
2
Q
What two types of control techniques are used?
A
Feedback and feedforward.
3
Q
Why are the feedback/forward techniques used?
A
Feedback response time would be too long.
Feedforward would be too unpredictable.
Balance between the two is required.
4
Q
Which physical properties does the control system need to balance?
A
Humidity, pressure, and temperature.
5
Q
What does the control system do when the FC is shutting down?
A
Purges water to avoid flooding.
6
Q
How is flooding monitored?
A
Using voltage taps distributed through stack.
7
Q
How are the voltage taps distributed?
A
Ideally would have one on each cell, but that is too heavy, so they are spread out through stack to monitor small groups.
