JP2014082856A - 燃料電池システム - Google Patents
燃料電池システム Download PDFInfo
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Abstract
【解決手段】車両に搭載され、ガス流路12,13を備え、ガス流路12,13に反応ガスが供給されることにより発電する燃料電池10と、前記車両の衝突可能性を検出する衝突予測手段40,50と、燃料電池10を放電させる放電手段47と、衝突予測手段40,50により衝突可能性が高いと予測された場合に、燃料電池10を放電手段47によって放電させる制御手段40と、を備えることを特徴とする、燃料電池システム100。
【選択図】図1
Description
図1は、本実施形態の燃料電池システム100の構成を示す図である。燃料電池システム100は、図示しない車両(自動車等)に搭載されるものである。燃料電池システム100は、燃料電池スタック10と、燃料電池スタック10のアノードガス流路12に対して水素(燃料ガス)を供給排出するアノード系と、燃料電池スタック10のカソードガス流路13に対して空気(酸化剤ガス)を供給排出するカソード系と、燃料電池スタック10の電力を消費する電力消費系と、燃料電池スタック10を放電させる(起電力を低下させる)短絡回路47と、これらを電子制御するECU(Electronic Control Unit)40(制御手段、衝突予測手段)と、車両の衝突可能性を予測するミリ波レーダ50(衝突予測手段)とを、主に備えている。
燃料電池スタック10は、複数(例えば200枚〜400枚)の固体高分子型の単セル11が積層して構成され、単セル11は直列に接続されている。単セル11は、MEA(Membrane Electrode Assembly;膜電極接合体)と、これを挟持する2枚の導電性セパレータと、を備えている。なお、単セル11の詳細な構造は図示していない。MEAは、1価の陽イオン交換膜等により構成される電解質膜(固体高分子膜)と、これを挟持するアノード及びカソード(いずれも電極)とを備えている。
2H2→4H++4e− ・・・式(1)
O2+4H++4e−→2H2O ・・・式(2)
アノード系は、水素タンク20と、遮断弁21と、エグゼタ22と、気液分離器23と、パージ弁24と、掃気ガス排出弁25と、ドレン弁26とを備えて構成されている。
カソード系は、ポンプ30と、加湿器31と、背圧弁32とを備えて構成されている。
希釈器27は、アノード系から排出された水素を、カソード系から排出された空気等により希釈するものである。これにより、水素濃度を低下させて、アノード系から排出された水素が車外に排出されるようになっている。また、アノード系から排出された水分も、希釈器27を経由して、車外に排出されるようになっている。
電力消費系は、モータ41及びバッテリ42を備えて構成されている。電力消費系は、FCコンタクタ44、インバータ45及びバッテリコンタクタ46を介して、燃料電池スタック10の電力取り出し端子(図示しない)に接続されている。
なお、ダイオード47aにより、電力消費系から短絡回路47にも電流が通流しない(即ち、短絡回路47による電力消費系の短絡が発生しない)ようになっているが、この点の詳細は後記する。
短絡回路47(放電手段)は、燃料電池スタック10を放電させるものである。短絡回路47は、燃料電池スタック10に対して、直接接続されている。短絡回路47は、通常時には遮断されており、燃料電池スタック10が短絡しないようになっている。一方で、短絡回路47が燃料電池スタック10に接続されたときは、燃料電池スタック10が短絡するようになっている。燃料電池スタック10が短絡することにより、燃料電池スタック10は強制的に放電される。即ち、燃料電池スタック10の起電力VFCが低下する。このとき、燃料電池スタック10の起電力VFCは、できるだけ速やかに低下するようになっている。
次に、燃料電池システム100の制御について説明する。前記のように、燃料電池システム100は、図1に示すECU40により制御される。
車両が通常駆動されているとき、ECU40は、ミリ波レーダ50により、前方の車両等までの距離及び相対速度を常時測定している。そして、自車と前方の車両(他車)等との間の距離(車間)と相対速度とにより算出される衝突余裕時間(TTC;Time to Collision)が予め定められた所定値よりも大きい場合には(ステップS101のNo方向)、ECU40は車両の衝突可能性が低いと判断して、図2に示すステップS102〜S113は行われない。なお、車両の通常駆動時には、前記のように短絡回路47は遮断され、燃料電池スタック10は短絡していない。
次に、燃料電池スタック10内のガス流路12,13の掃気時の、各手段の制御について、図3及び図4を参照しながら説明する。図3は、車両の衝突が回避不可能である場合(図2のステップS110のYes方向)の各手段の制御、図4は、車両の衝突が回避可能である場合(図2のステップS110のNo方向)の各手段の制御である。
なお、図3及び図4においては、説明を分かり易くするために、各手段の制御間隔を誇張して示しているが、現実には、図示よりも短い間隔で行われる。
はじめに、衝突回避不可能時の各手段の制御について、主に図3を参照しながら説明する。
次に、衝突回避時の各手段の制御について、主に図4を参照しながら説明する。なお、衝突回避可能時の制御は、図3において示した時刻t3直前までは、図3において示した制御と同様である。そこで、以下の説明においては、図3の時刻t3に代えて、時刻t4で回避可能と判断された場合を例示する。
以上説明した燃料電池システム100によれば、車両の衝突可能性が高いときに、予め、燃料電池の起電力を低下させることができる。具体的には、前記のように、燃料電池スタック10が、短絡回路47により強制的に放電されている。これにより、燃料電池スタック10内部の貫通抵抗のみによっては時間を要する起電力VFCの低下を、車両の衝突確定前に素早く行うことができる。
本実施形態は前記の内容に何ら制限されるものではなく、本発明の要旨を逸脱しない範囲内で任意に変更して実施可能である。
12 アノードガス流路(ガス流路)
13 カソードガス流路(ガス流路)
40 ECU(制御手段、衝突予測手段、電力遮断手段)
41 モータ(駆動手段)
42 バッテリ(蓄電手段)
43 電圧計(電圧測定手段)
44 FCコンタクタ(電力遮断手段)
47 短絡回路(放電手段)
48 昇圧回路(放電手段)
50 ミリ波レーダ(衝突予測手段)
100 燃料電池システム
Claims (5)
- 車両に搭載され、
ガス流路を備え、前記ガス流路に反応ガスが供給されることにより発電する燃料電池と、
前記車両の衝突可能性を予測する衝突予測手段と、
前記燃料電池を放電させる放電手段と、
前記衝突予測手段により衝突可能性が高いと予測された場合に、前記燃料電池を前記放電手段によって放電させる制御手段と、
を備えることを特徴とする、燃料電池システム。 - 前記制御手段は、前記放電手段による放電を断続的に行うことを特徴とする、請求項1に記載の燃料電池システム。
- 前記燃料電池の起電力を測定する電圧測定手段を備え、
前記制御手段は、前記電圧測定手段により測定される前記燃料電池の起電力が負電圧になったときに、前記放電手段による放電をいったん停止し、所定時間経過後に再開することを特徴とする、請求項2に記載の燃料電池システム。 - 前記放電手段は短絡回路を備える昇圧回路であり、前記燃料電池と前記昇圧回路の電圧入力側とが接続され、前記昇圧回路の電圧出力側には前記燃料電池の電力を消費する電力消費手段が接続され、
前記制御手段は、前記電圧入力側から入力されて前記昇圧回路により昇圧され、前記電圧出力側から出力される電圧が、前記電力消費手段の定格電圧よりも低くなると判断したときに、前記短絡回路を接続して前記燃料電池を短絡させて放電させることを特徴とする、請求項1〜3の何れか1項に記載の燃料電池システム。 - 前記燃料電池に接続され、前記燃料電池が発電した電力により前記車両を駆動させる駆動手段と、前記駆動手段と前記燃料電池とを電気的に遮断する電力遮断手段と、を備え、
前記衝突予測手段が、前記車両の衝突が回避不可能な程度の衝突可能性を予測した場合に、前記電力遮断手段は、前記駆動手段と前記燃料電池とを電気的に遮断することを特徴とする、請求項1〜4の何れか1項に記載の燃料電池システム。
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JP2016012461A (ja) * | 2014-06-27 | 2016-01-21 | 本田技研工業株式会社 | 燃料電池システムの停止方法 |
WO2016047269A1 (ja) * | 2014-09-24 | 2016-03-31 | トヨタ自動車株式会社 | 電動車両の燃料電池システム及びその制御方法 |
WO2022158315A1 (ja) * | 2021-01-20 | 2022-07-28 | 株式会社ジェイテクト | 燃料電池システム |
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