JP7119705B2 - 燃料電池システム - Google Patents
燃料電池システム Download PDFInfo
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- JP7119705B2 JP7119705B2 JP2018139949A JP2018139949A JP7119705B2 JP 7119705 B2 JP7119705 B2 JP 7119705B2 JP 2018139949 A JP2018139949 A JP 2018139949A JP 2018139949 A JP2018139949 A JP 2018139949A JP 7119705 B2 JP7119705 B2 JP 7119705B2
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- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Description
この形態の燃料電池システムによれば、取得された燃料電池温度と、取得された部品温度と、の差である温度差が予め定められた温度以上である場合に、二次電池の蓄電量が予め定められた蓄電量となるまでの間、燃料電池の暖機処理を実行して該暖機処理により生じた電力を二次電池に蓄電し、該暖機処理の実行後、予め定められた掃気能力で掃気を実行するので、暖機処理によって部品が昇温された状態で燃料電池の掃気を実行できる。この結果、部品内に流入したオフガスや水の残量を低減でき、外気温が低下して部品の温度が低下していても、かかる部品内においてオフガスや水が凍結することを抑制できる。したがって、燃料電池を次に起動した際に、循環流路の一部または全部が閉塞して発電が行えなくなることを抑制できる。
(2)上記形態の燃料電池システムにおいて、前記制御部は、前記暖機処理において前記二次電池の前記蓄電量が前記予め定められた蓄電量に達したときに、前記温度差が前記予め定められた温度以上である場合、前記暖機処理の実行後、前記予め定められた掃気能力に比べて高い掃気能力で前記掃気を実行してもよい。
この形態の燃料電池システムによれば、暖機処理において二次電池の蓄電量が予め定められた蓄電量に達したときに、温度差が予め定められた温度以上である場合、暖機処理の実行後、予め定められた掃気能力に比べて高い掃気能力で掃気を実行するので、部品における燃料電池から排出されたオフガスや水の排出力を高めることができる。この結果、暖機処理後に温度差が予め定められた温度以上であっても、かかる部品においてオフガスに含まれる水分や水が凍結することを抑制できる。
A1.燃料電池システムの構成:
図1は、本開示の一実施形態としての燃料電池システム100の構成を示す概略図である。燃料電池システム100は、例えば、車両に搭載され、運転者からの要求に応じて車両の動力源となる電力を出力する。燃料電池システム100は、燃料電池10と、酸化剤ガス供給排出部30と、燃料ガス供給排出部50と、冷却媒体循環部70と、制御装置20とを備える。燃料電池システム100は、さらに、DC/DCコンバータ90と、二次電池92とを備える。
図2は、燃料電池システム100で実行される掃気処理の処理手順を示すフローチャートである。燃料電池システム100では、車両全体の制御をする上位のECU(Electronic Control Unit)からイグニッションスイッチがオンからオフに切り替わったことを示す信号が送信され、かかる信号が制御装置20において受信されると、図2に示す掃気処理が実行される。
第2実施形態における燃料電池システム100は、図1に示す第1実施形態における燃料電池システム100と同様であるので、その詳細な説明は省略する。
第3実施形態における燃料電池システム100は、図1に示す第1実施形態における燃料電池システム100と同様であるので、その詳細な説明は省略する。
D1.他の実施形態1:
上記各実施形態において、部品温度として水素ポンプ65の温度を用いていたが、本開示はこれに限定されない。例えば、気液分離器62の温度を部品温度として用いてもよい。また、例えば、第1調圧弁42の温度を部品温度として用いてもよい。すなわち、一般には、燃料電池10から排出されるオフガスの循環流路に設けられた部品の温度を部品温度として用いる構成において、上記各実施形態と同様の効果を奏する。
上記各実施形態において、燃料電池温度として電池温度取得部77により測定された冷却媒体の温度を用いていたが、本開示はこれに限定されない。例えば、他の部品の温度であって燃料電池温度と相関性がある温度を燃料電池温度としてもよい。また、例えば、過去に取得した燃料電池温度から現在の燃料電池温度を推定してもよい。また、例えば、予め実験等により燃料電池温度を算出して、関数あるいはマップ化しておいてもよい。このような構成においても、上記各実施形態と同様の効果を奏する。
上記各実施形態において、強化ソーク中掃気処理(ステップS145)は、温度差ΔTが閾値温度(5℃)以上であり、二次電池92の蓄電量SOCが予め定められた蓄電量(70%)以上である場合に実行されていたが、本開示はこれに限定されない。例えば、二次電池92の端子が外される等のイレギュラーな操作が実行されたことを制御部22が検出した場合に、強化ソーク中掃気処理が実行されてもよい。このような構成においても、上記各実施形態と同様な効果を奏する。
上記各実施形態において、強化ソーク中掃気処理(ステップS145)では、アノード側の掃気が強化されていたが、これに代えて、または、これに加えて、カソード側の掃気が強化されてもよい。例えば、エアコンプレッサ33の駆動時間を、ソーク中掃気処理におけるエアコンプレッサ33の駆動時間に比べて長く設定し、第1調圧弁42を全開状態とすることにより、カソード側の掃気を強化してもよい。これにより、酸化オフガス配管41および第1調圧弁42内のオフガスおよび水の排出力を高めることができる。このような構成においても、上記各実施形態と同様な効果を奏する。
Claims (1)
- 燃料電池システムであって、
燃料電池と、
前記燃料電池に反応ガスを供給する反応ガス供給部と、
前記燃料電池から排出されるオフガスの循環流路に設けられた部品と、
前記燃料電池の温度である燃料電池温度を取得する電池温度取得部と、
前記部品の温度である部品温度を取得する部品温度取得部と、
二次電池と、
前記二次電池の蓄電量を取得する蓄電量取得部と、
前記燃料電池システムの発電の停止の際、前記燃料電池の掃気を実行する制御部と、
を備え、
前記制御部は、取得された前記燃料電池温度と、取得された前記部品温度と、の差である温度差が予め定められた温度以上である場合に、
前記二次電池の前記蓄電量が予め定められた蓄電量となるまでの間、前記燃料電池の暖機処理を実行して該暖機処理により生じた電力を前記二次電池に蓄電し、該暖機処理の実行後、予め定められた掃気能力で前記掃気を実行し、
前記暖機処理において前記二次電池の前記蓄電量が前記予め定められた蓄電量に達したときに、前記温度差が前記予め定められた温度以上である場合、前記暖機処理の実行後、前記予め定められた掃気能力に比べて高い掃気能力で前記掃気を実行する、
燃料電池システム。
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