	US 11,982,453 B2
	Incremental actuator with feedback control diagnostics
Justin J. Seifi, Cedarburg, WI (US); and Mark G. Freund, Wauwatosa, WI (US)
Assigned to Tyco Fire & Security GmbH, Neuhausen am Rheinfall (CH)
Filed by Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed on Sep. 1, 2021, as Appl. No. 17/464,294.
Claims priority of provisional application 63/073,510, filed on Sep. 2, 2020.
Prior Publication US 2022/0065476 A1, Mar. 3, 2022
Int. Cl. F24F 11/32 (2018.01); F24F 11/63 (2018.01); G05B 15/02 (2006.01)

CPC F24F 11/32 (2018.01) [F24F 11/63 (2018.01); G05B 15/02 (2013.01)]

20 Claims

1. A controller for controlling operation of an actuator in a heating, ventilation, or air conditioning (HVAC) system, the controller comprising a processing circuit configured to:

receive, via a position sensor communicatively coupled to the actuator, a first voltage value, the first voltage value indicative of a first position of the actuator;

provide a control signal to the actuator to move to a second position;

in response to the actuator moving to the second position, determine that the actuator is located in a different position than the second position based on a second voltage value via the position sensor; and

automatically perform a fault correction process to calculate an updated stroke range of the actuator, wherein the fault correction process comprises:

determining an initial stroke range indicative of a time period for the actuator to move from a first endpoint to a second endpoint;

instructing the actuator to move to the first endpoint for a first period greater than the initial stroke range;

receiving a first test voltage signal at the first endpoint;

instructing the actuator to move to the second endpoint for a second period greater than the initial stroke range;

receiving a second test voltage signal at the second endpoint; and

calculating the updated stroke range based on the initial stroke range, the first test voltage signal, and the second test voltage signal.