US 12,345,675 B2
Gas sensor element
Tomofumi Fujii, Kariya (JP); and Makoto Noguchi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 16, 2022, as Appl. No. 17/888,671.
Application 17/888,671 is a continuation of application No. PCT/JP2021/002193, filed on Jan. 22, 2021.
Claims priority of application No. 2020-024017 (JP), filed on Feb. 17, 2020.
Prior Publication US 2022/0390410 A1, Dec. 8, 2022
Int. Cl. G01N 27/406 (2006.01); G01N 27/407 (2006.01); G01N 27/41 (2006.01); G01N 27/417 (2006.01)
CPC G01N 27/4067 (2013.01) [G01N 27/4071 (2013.01); G01N 27/41 (2013.01); G01N 27/417 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A limiting current-type gas sensor element including a plurality of stacked ceramic layers and configured to output a limiting current value which depends on a concentration of a specific gas in a gas to be measured when a certain voltage is applied, the gas sensor element comprising:
a solid electrolyte member having oxygen ion conductivity;
a heater that heats the solid electrolyte member;
a measurement electrode and a reference electrode provided on the solid electrolyte member;
a chamber facing the measurement electrode and into which the gas to be measured is introduced;
a gas inlet located to a tip side of the chamber in a longitudinal direction of the gas sensor element; and
a diffusion resistance part provided in the gas inlet, wherein
a heating center of the heater is located further to the tip side than an electrode center of the measurement electrode is; and
the heating center is located further to a base end side of the gas sensor element than a tip of the measurement electrode is in the longitudinal direction.