US 11,812,522 B2
Heating device and method for detecting failure of heating device
Hajime Tsubata, Kusatsu (JP); Takaaki Yamada, Kusatsu (JP); and Takeshi Wakabayashi, Kyoto (JP)
Assigned to OMRON Corporation, Kyoto (JP)
Appl. No. 16/639,551
Filed by OMRON Corporation, Kyoto (JP)
PCT Filed Jan. 22, 2019, PCT No. PCT/JP2019/001743
§ 371(c)(1), (2) Date Feb. 14, 2020,
PCT Pub. No. WO2019/167473, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 2018-037074 (JP), filed on Mar. 2, 2018.
Prior Publication US 2021/0136872 A1, May 6, 2021
Int. Cl. G05D 23/19 (2006.01); H05B 1/02 (2006.01); G05D 23/00 (2006.01); G05B 6/02 (2006.01)
CPC H05B 1/02 (2013.01) [G05D 23/00 (2013.01); G05D 23/1902 (2013.01); G05B 6/02 (2013.01); H05B 1/023 (2013.01); H05B 2203/035 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A heating device that includes a heater configured to heat an item, a temperature detection unit configured to detect a temperature of the item heated, and a temperature adjustment unit configured to control the heater on the basis of a detected value of the temperature detection unit and a target temperature so that the temperature of the item heated reaches the target temperature, the heating device comprising:
a system gain change rate calculation unit configured to obtain a temperature increase value of the item heated from the detected value of the temperature detection unit, obtain a system gain, which is a ratio of the temperature increase value of the item heated with respect to electric power inputted to the heater, and obtain, as a system gain change rate, a rate of change from an initial value of the system gain; and
a heat retention change rate calculation unit configured to obtain a rate of change in heat retention of the item heated from the system gain change rate.