Method of pressure and gas mix control for non-invasive ventilation

1. A ventilator configured to control a pressure and gas mixture for an air flow, the ventilator comprising:

a gas source;

a proportional valve configured to control a gas flow rate from the gas source;

a mix controller in communication with the proportional valve, wherein the mix controller is configured to monitor a flow of gas through a blower, and further configured to control a percentage of oxygen in output flow;

a blower motor; and

a blower motor controller configured to control a speed of the blower motor using a blower speed feedback loop configured to generate a speed output signal, a flow feedback loop, and a pressure feedback loop, wherein the blower motor controller comprises a complimentary filter configured to blend a machine pressure signal at a first frequency and a proximal pressure signal at a second frequency, lower than the first frequency, into a single feedback signal, and wherein the pressure feedback loop is configured to receive as input: (i) a pressure trajectory; (ii) the single feedback signal from the complimentary filter; and (iii) the speed output signal from the blower speed feedback loop.

2. The ventilator of claim 1 , wherein the mix controller and the blower controller are configured to cooperatively control the output flow.

3. The ventilator of claim 1 , wherein the blower speed feedback loop is configured to provide linear control of the speed of the blower motor and maintain a speed limitation.

4. The ventilator of claim 1 , wherein the flow feedback loop is configured to minimize a disturbance of air flow pressure in the ventilator.

5. The ventilator of claim 1 , wherein the pressure feedback loop is configured to track an applied pressure trajectory.

6. The ventilator of claim 1 , further comprising a speed controller, the speed controller configured to monitor the speed of the blower motor.

7. The ventilator of claim 1 , further comprising a pseudo-derivative feedback compensator.

8. The ventilator of claim 1 , wherein the flow feedback loop is configured to minimize a disturbance of blower gas flow pressure in the ventilator relative to a desired flow trajectory.

9. A method for controlling a pressure and gas mixture for an air flow of a ventilator, the method comprising the steps of:

providing a ventilator, the ventilator comprising; a gas source; a proportional valve configured to control a gas flow rate from the gas source; a mix controller in communication with the proportional valve and a blower flow sensor; a blower motor; a blower motor controller comprising a complimentary filter configured to blend a machine pressure signal at a first frequency and a proximal pressure signal at a second frequency, lower than the first frequency, into a single feedback signal; and a pressure controller comprising a flow controller and a speed controller;

activating the blower motor and opening the proportional valve to create flow pressure and mix in the ventilator;

controlling, by the blower motor controller, the speed of the blower motor using a blower speed feedback loop configured to generate a speed output signal, a flow feedback loop, and a pressure feedback loop, wherein the pressure feedback loop is configured to receive as input: (i) a pressure trajectory; (ii) the single feedback signal from the complimentary filter; and (iii) the speed output signal from the blower speed feedback loop;

monitoring, by the mix controller, a flow through the blower; and

adjusting, using the mix controller, the proportional valve flow to provide mix control.

10. The method of claim 9 , further comprising the steps of:

monitoring, using a speed controller, a speed of the blower motor; and

adjusting, using the speed controller, the speed of the blower motor.