JP2019138800A - 特定ガス濃度測定装置及び特定ガス濃度測定システム - Google Patents
特定ガス濃度測定装置及び特定ガス濃度測定システム Download PDFInfo
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Abstract
Description
固体電解質体と、前記固体電解質体に配設された検知電極と、前記固体電解質体に配設された参照電極とを有する混成電位セルを備えたセンサ素子を用いて、アンモニア及び可燃性ガスのうちいずれかの特定ガスの被測定ガス中の濃度である特定ガス濃度を測定する特定ガス濃度測定装置であって、
前記検知電極が前記被測定ガスに晒された状態での前記混成電位セルの起電力を取得する起電力取得部と、
前記被測定ガスの酸素濃度を取得する酸素濃度取得部と、
前記特定ガス濃度と前記酸素濃度と前記起電力との対応関係である測定用対応関係と、アンモニア及び可燃性ガスを含まないガスに前記検知電極が晒された場合の前記起電力である基準起電力に関する基準起電力情報と、を記憶する記憶部と、
前記記憶された測定用対応関係に基づいて、前記取得された起電力と、前記取得された酸素濃度と、に対応する前記特定ガス濃度を導出する濃度導出処理を行う特定ガス濃度導出部と、
を備え、
前記特定ガス濃度導出部は、アンモニア及び可燃性ガスを含まないとみなせる状態の前記被測定ガスである補正値導出用ガスに前記検知電極が晒されているタイミングを補正値導出タイミングとして、前記補正値導出タイミングで前記起電力取得部に前記起電力を取得させ、該取得された起電力である補正値導出用起電力と前記記憶された基準起電力情報に基づく前記基準起電力との差を打ち消すための補正値を導出し、該補正値導出タイミング以降の前記濃度導出処理では、前記取得された起電力を前記補正値で補正した補正後起電力を用いて前記特定ガス濃度を導出する、
ものである。
(EMFは起電力[mV]、pNH3は被測定ガス中のアンモニア濃度[ppm]、pO2は被測定ガス中の酸素濃度[%]、A〜Cは定数)
(EMFは起電力[V]、Rは気体定数[J/(K・mol)]、Tは混成電位セル55の温度[K]、F:ファラデー定数[C/mol]、PO2gasはモデルガス中の酸素濃度[%]、PO2airは大気中の酸素濃度[%])
Claims (7)
- 固体電解質体と、前記固体電解質体に配設された検知電極と、前記固体電解質体に配設された参照電極とを有する混成電位セルを備えたセンサ素子を用いて、アンモニア及び可燃性ガスのうちいずれかの特定ガスの被測定ガス中の濃度である特定ガス濃度を測定する特定ガス濃度測定装置であって、
前記検知電極が前記被測定ガスに晒された状態での前記混成電位セルの起電力を取得する起電力取得部と、
前記被測定ガスの酸素濃度を取得する酸素濃度取得部と、
前記特定ガス濃度と前記酸素濃度と前記起電力との対応関係である測定用対応関係と、アンモニア及び可燃性ガスを含まないガスに前記検知電極が晒された場合の前記起電力である基準起電力に関する基準起電力情報と、を記憶する記憶部と、
前記記憶された測定用対応関係に基づいて、前記取得された起電力と、前記取得された酸素濃度と、に対応する前記特定ガス濃度を導出する濃度導出処理を行う特定ガス濃度導出部と、
を備え、
前記特定ガス濃度導出部は、アンモニア及び可燃性ガスを含まないとみなせる状態の前記被測定ガスである補正値導出用ガスに前記検知電極が晒されているタイミングを補正値導出タイミングとして、前記補正値導出タイミングで前記起電力取得部に前記起電力を取得させ、該取得された起電力である補正値導出用起電力と前記記憶された基準起電力情報に基づく前記基準起電力との差を打ち消すための補正値を導出し、該補正値導出タイミング以降の前記濃度導出処理では、前記取得された起電力を前記補正値で補正した補正後起電力を用いて前記特定ガス濃度を導出する、
特定ガス濃度測定装置。 - 前記被測定ガスは、内燃機関の排ガスであり、
前記補正値導出用ガスは、前記内燃機関のフューエルカット時の排ガスである、
請求項1に記載の特定ガス濃度測定装置。 - 請求項2に記載の特定ガス濃度測定装置であって、
前記フューエルカットがなされた旨のフューエルカット実行情報を取得する情報取得部、
を備え、
前記特定ガス濃度導出部は、前記取得されたフューエルカット実行情報に基づいて前記補正値導出タイミングを検出する、
特定ガス濃度測定装置。 - 前記補正値導出用ガスは、前記被測定ガスが大気であるとみなせる状態の該被測定ガスである、
請求項1〜3のいずれか1項に記載の特定ガス濃度測定装置。 - 前記特定ガス濃度導出部は、前記酸素濃度取得部に取得された酸素濃度が大気中の酸素濃度と同じとみなせる所定範囲の値であるか否かを判定し、この判定結果に基づいて前記補正値導出タイミングを検出する、
請求項4に記載の特定ガス濃度測定装置。 - 前記基準起電力情報は、アンモニア及び可燃性ガスを含まないガスに前記検知電極が晒された場合の該ガス中の酸素濃度と前記基準起電力との対応関係を含む情報であり、
前記特定ガス濃度導出部は、前記記憶された基準起電力情報に基づいて、前記酸素濃度取得部に取得された前記補正値導出用ガス中の酸素濃度に対応する前記基準起電力を導出し、該導出された基準起電力と前記補正値導出用起電力とに基づいて前記補正値を導出する、
請求項1〜5のいずれか1項に記載の特定ガス濃度測定装置。 - 請求項1〜6のいずれか1項に記載の特定ガス濃度測定装置と、
前記センサ素子と、
を備えた特定ガス濃度測定システム。
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