Implement Motor Control Loop

[mrrosen]

Implement motor control loop for driving the motor during inhalation cycle. In most modes, the I:E, Respiration Rate and Volume set points define a fixed volume of air to be delivered to the patient in a fixed time.

[mrrosen]

Suggested control loop might be best implemented as a PID controller over the flow rate - calculating the set point based on Volume / I:E / Respiration Rate (so, if Volume is 300 mL, I:E is 1:2, and Respiration Rate is 10 BPM, target flow rate would be 150 mL/s). Thus, the current set point for flow rate would be 150 mL/s. After 300 ms, if 50 mL had been delivered, the set point would become 147 mL/s. From medically team, there is flexibility in the I:E ratio, so priority for set points is as follows: Volume, Respiratory Rate, I:E.

Current thought would be a update rate of 50 Hz (20ms) for the control loop.