US 12,436,129 B2
Method for determining a concentration of a gas component and control device configured therefore
Ola Stenlåås, Hägersten (SE)
Assigned to Scania CV AB, Södertälje (SE)
Filed by Scania CV AB, Södertälje (SE)
Filed on Oct. 6, 2021, as Appl. No. 17/495,073.
Claims priority of application No. 2051237-2 (SE), filed on Oct. 23, 2020.
Prior Publication US 2022/0128507 A1, Apr. 28, 2022
Int. Cl. G01N 27/407 (2006.01); F01N 11/00 (2006.01); G01N 27/406 (2006.01); G01N 27/41 (2006.01); G01N 27/417 (2006.01); G01N 27/419 (2006.01); G01N 33/00 (2006.01); F01N 13/00 (2010.01)
CPC G01N 27/4072 (2013.01) [G01N 27/406 (2013.01); G01N 27/407 (2013.01); G01N 27/41 (2013.01); G01N 27/417 (2013.01); G01N 27/419 (2013.01); F01N 11/00 (2013.01); F01N 13/008 (2013.01); G01N 33/0037 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for determining a concentration of a first gas component of a gas to be analyzed using a gas sensor comprising: an inlet for the gas to be analyzed, a cavity defined by a cavity wall, the cavity being in fluid communication with the inlet via a first diffusion control member, a first wall portion of the cavity wall being formed of a first solid electrolyte membrane, and a second wall portion of the cavity wall being formed of a second solid electrolyte membrane, a first electromechanical pump arranged to pump a second gas component of the gas through the first solid electrolyte membrane, and a second electromechanical pump arranged to pump a third gas component derived from the first gas component through the second solid electrolyte membrane, the method comprising:
operating the first electromechanical pump continuously so as to remove the second gas component from the cavity by pumping the second gas component through the first solid electrolyte membrane;
operating the second electromechanical pump in a plurality of consecutive phase pairs, each phase pair comprising a first phase and a second phase, wherein the second electromechanical pump is in a deactivated state during the first phase and in an activated state during the second phase, wherein in the deactivated state, an amount of any gas component of the gas present in the cavity accumulates, and wherein in the activated state, the second electromechanical pump pumps the third gas component through the second solid electrolyte membrane;
recording a current induced in the second solid electrolyte membrane during the second phase; and
determining the concentration of the first gas component based on said recorded current.