US 12,360,094 B2
Method, apparatus and system for monitoring sensor health and gas response for catalytic pellistor poisoning
JePhil Ahn, Seoul (KR); Jaeyeol Shim, Seoul (KR); HyungWoo Baek, Seoul (KR); SeungYong Shin, Seoul (KR); WoongSung Hwang, Seoul (KR); HyeonHo So, Seoul (KR); and JinEok Cho, Seoul (KR)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on May 24, 2022, as Appl. No. 17/664,780.
Prior Publication US 2023/0384278 A1, Nov. 30, 2023
Int. Cl. G01N 33/00 (2006.01); G01N 27/16 (2006.01); G01N 27/417 (2006.01)
CPC G01N 33/007 (2013.01) [G01N 27/16 (2013.01); G01N 27/4175 (2013.01); G01N 33/0006 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for detecting catalytic pellistor poisoning associated with a gas sensing device, the gas sensing device comprising a circuit including a resistor, a compensator, and a detector, the method comprising:
determining, by a computing device, an initial resistor voltage value of the resistor, an initial compensator voltage value of the compensator, and an initial detector voltage value of the detector;
calculating, by the computing device, an initial circuitry current value based on the initial resistor voltage value and a resistance value of the resistor;
subsequent to causing an injection of a gaseous substance to the gas sensing device:
determining, by the computing device, a subsequent compensator voltage value of the compensator and a subsequent detector voltage value of the detector;
calculating, by the computing device, a subsequent circuitry current value based on a subsequent resistor voltage value of the resistor and the resistance value;
calculating, by the computing device, a compensator resistance change value based on the initial circuitry current value, the initial compensator voltage value, the subsequent circuitry current value, and the subsequent compensator voltage value;
calculating, by the computing device, a detector resistance change value based on the initial circuitry current value, the initial detector voltage value, the subsequent circuitry current value, and the subsequent detector voltage value; and
generating, by the computing device, a catalytic pellistor poisoning indicator based on a comparison between the compensator resistance change value and the detector resistance change value.