CARBON DIOXIDE DETECTION DEVICE

• Main Authors: KIMATA TAKEHITO, ICHIKAWA DAIJU, HAGINO SHOTA, TERANISHI SHINYA
• Format: Patent
• Language: English; Japanese
• Published: 30.04.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a carbon dioxide detection device capable of maintaining improved carbon dioxide detection accuracy.SOLUTION: A carbon dioxide detection device 1 comprises: a sensor element 2 including an ionic conductor 31 provided with an air-fuel ratio detection electrode 311A, a carbon dioxide detection electrode 311B and a reference electrode 312; and a control unit 5 including a first current detection part 52A, a second current detection part 52B and a concentration calculation part 53. The first current detection part 52A detects first current A1 flowing when a first voltage V1 is applied between the air-fuel ratio detection electrode 311A and the reference electrode 312. The second current detection part 52B detects second current A2 flowing when a second voltage V2 higher than the first voltage V1 is applied between the carbon dioxide detection electrode 311B and the reference electrode 312. The concentration calculation part 53 calculates concentration of carbon dioxide in exhaust gas G by using correction of the second current A2 by the first current A1.SELECTED DRAWING: Figure 1 【課題】二酸化炭素の検出精度を高く維持することができる二酸化炭素検出装置を提供する。【解決手段】二酸化炭素検出装置１は、空燃比検出電極３１１Ａ、二酸化炭素検出電極３１１Ｂ及び基準電極３１２が設けられたイオン伝導体３１を有するセンサ素子２と、第１電流検出部５２Ａ、第２電流検出部５２Ｂ及び濃度算出部５３を有する制御ユニット５とを備える。第１電流検出部５２Ａは、空燃比検出電極３１１Ａと基準電極３１２との間に第１電圧Ｖ１が印加されたときに流れる第１電流Ａ１を検出する。第２電流検出部５２Ｂは、二酸化炭素検出電極３１１Ｂと基準電極３１２との間に第１電圧Ｖ１よりも高い第２電圧Ｖ２が印加されたときに流れる第２電流Ａ２を検出する。濃度算出部５３は、第２電流Ａ２を第１電流Ａ１によって補正することを利用して、排ガスＧにおける二酸化炭素の濃度を算出する。【選択図】図１