JP7261828B2 - 燃料電池システム及び該システムの制御方法 - Google Patents
燃料電池システム及び該システムの制御方法 Download PDFInfo
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Description
図1は、実施形態に係る燃料電池システム14が組み込まれた燃料電池車両10の構成を示す模式的ブロック図である。
次に、基本的には以上のように構成される燃料電池システム14の動作について、[1]燃料電池車両10の走行時等における通常発電中の動作、[2]アノード流路48での水素濃度低下時における希釈酸化剤ガス量の算出動作の順で説明する。
通常発電中(アノード電極43側での水素濃度がブリード弁158を開弁させる必要のない閾値以上である場合の走行中等)の動作について、燃料ガス、酸化剤ガス、電力の流れに実線の矢線を付けた図2を参照して、以下に説明する。なお、図2中、破線の矢線は、後述する希釈酸化剤ガス量の算出動作の説明に供される。
次に、図3に示すフローチャートを参照してアノード電極43(アノード流路48)側での水素濃度低下時にバイパス弁122から希釈器66側に供給が必要な希釈酸化剤ガス量Qbの算出処理について説明する。
上記した通常発電中、カソード流路47に存在する窒素が電解質膜・電極構造体44を透過してアノード流路48内に入ってくると、アノード流路48内の水素濃度が低下し、水素濃度が低下することを原因としてアノード電極43が劣化する虞がある。
燃料電池スタック16の発電中、ブリード弁158とバイパス弁122の閉弁状態で、図3のフローチャートによる処理が開始される。
Qs=Qo-Qb …(1)
Qh=Qe×(1―Rc) …(2)
Qb={(100[%]-Dtar[%])×Qh}/Dtar[%]
…(3)
ここで、上記実施形態から把握し得る発明について、以下に記載する。なお、理解の便宜のために構成要素には実施形態で用いた符号を付けているが、該構成要素は、その符号を付けたものに限定されない。
14…燃料電池システム 16…燃料電池スタック
25…ドライバ 26…エアポンプ
42…カソード電極 43…アノード電極
47…カソード流路 48…アノード流路
56…エアフローセンサ 62…希釈器入口圧力センサ
64…吐出圧圧力センサ 67…カソード入口圧力センサ
70…アノード出口圧力センサ 76…温度センサ
78…記憶部 120…バイパス管路
122…バイパス弁 156…連絡管路
158…ブリード弁 201、202…特性
220…触媒反応率変換マップ
Claims (4)
- エアポンプから吐出されカソード流路の入口を通じてカソード電極に供給される酸化剤ガスと、アノード流路の入口を通じてアノード電極に供給される燃料ガスと、により発電する燃料電池を備える燃料電池システムであって、
前記燃料電池の前記アノード流路の出口から排出される燃料排ガスを前記カソード流路の入口に導入する連絡流路と、
前記燃料電池システムを制御する制御部と、を備え、
前記制御部は、
前記連絡流路から前記カソード流路の入口に導入され前記カソード電極に流通された前記燃料排ガスのうち、前記カソード流路の出口から排出される燃料ガス量を推定し、
推定した前記燃料ガス量から、大気への排出時に希釈に必要な酸化剤ガス量を求め、
求めた酸化剤ガス量に基づき前記エアポンプの吐出量を設定する
燃料電池システム。 - 請求項1に記載の燃料電池システムにおいて、
前記制御部は、
前記カソード流路の出口から排出される燃料ガス量の推定を、
前記アノード流路の出口から前記連絡流路を介して前記カソード電極に導入される燃料排ガス量と、前記カソード電極で生じる触媒反応による触媒反応率と、に基づき推定する
燃料電池システム。 - 請求項2に記載の燃料電池システムにおいて、
前記制御部は、
前記触媒反応率を、前記燃料電池の温度又は前記エアポンプから前記カソード電極に供給される酸化剤ガス量に基づき推定する
燃料電池システム。 - エアポンプから吐出されカソード流路の入口を通じてカソード電極に供給される酸化剤ガスと、アノード流路の入口を通じてアノード電極に供給される燃料ガスと、により発電する燃料電池を備える燃料電池システムの制御方法であって、
前記燃料電池の前記アノード流路の出口から排出される燃料排ガスを、連絡流路を介して前記カソード流路の入口に導入し、
前記連絡流路から前記カソード流路の入口に導入され前記カソード電極に流通された前記燃料排ガスのうち、前記カソード流路の出口から排出される燃料ガス量を推定し、
推定した前記燃料ガス量から、大気への排出時に希釈に必要な酸化剤ガス量を求め、
求めた酸化剤ガス量に基づき前記エアポンプの吐出量を設定する
燃料電池システムの制御方法。
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JP2021043630A JP7261828B2 (ja) | 2021-03-17 | 2021-03-17 | 燃料電池システム及び該システムの制御方法 |
US17/681,803 US11757114B2 (en) | 2021-03-17 | 2022-02-27 | Fuel cell system and method of controlling the system |
CN202210186379.4A CN115117396A (zh) | 2021-03-17 | 2022-02-28 | 燃料电池系统以及该系统的控制方法 |
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US11757114B2 (en) | 2023-09-12 |
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