Patent ID: 11904060
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Medical technology (Instruments)
Classification: CPC A  B | IPC A  B

Claim 0:
1. A control system in a UVC-based aircraft sanitization system for controlling the UVC-based aircraft sanitization system to maintain a desired UVC (ultraviolet C) radiation level at a target surface in an aircraft under varying operating conditions, the control system comprising:
a sensor that measures a property from which a radiation level that is applied at the target surface by the UVC-based aircraft sanitization system can be determined, wherein the sensor comprises a radiation measurement device that measures the radiation level that is applied at the target surface;
a controller configured to:
receive sensor feedback from the sensor, wherein the sensor feedback comprises measured radiation feedback that identifies the radiation level that is applied at the target surface by the UVC-based aircraft sanitization system; and
generate a UVC source control command for UVC sources in the UVC-based aircraft sanitization system, based on the received sensor feedback, to control the UVC sources to increase or decrease radiation level output to generate sufficient radiation to achieve the desired radiation level at the target surface;

an outer feedback loop for receiving the measured radiation feedback from the radiation measurement device on the target surface and a referenced desired radiation level at the target surface and generating a dose error;
an inner feedback loop for receiving UVC source drive feedback and a UVC drive reference and generating the UVC source control command for the UVC sources, based on the dose error and the UVC source drive feedback, to control the UVC sources to increase or decrease radiation level output;
a first intermediate feedback loop between the outer feedback loop and the inner feedback loop for receiving distance feedback and generating a distance error based on the dose error; and
a second intermediate feedback loop between the outer feedback loop and the inner feedback loop for receiving speed feedback and generating a speed error based on the dose error;
wherein:
the inner feedback loop is configured to generate the UVC source control command for the UVC sources, based on the distance error, the speed error and the UVC source drive feedback, to control the UVC sources to increase or decrease radiation level output; and
the dose error is used to generate a UVC unit distance reference used in the first intermediate feedback loop to generate the distance error.