JP2020092030A - 燃料電池システム - Google Patents
燃料電池システム Download PDFInfo
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- JP2020092030A JP2020092030A JP2018229236A JP2018229236A JP2020092030A JP 2020092030 A JP2020092030 A JP 2020092030A JP 2018229236 A JP2018229236 A JP 2018229236A JP 2018229236 A JP2018229236 A JP 2018229236A JP 2020092030 A JP2020092030 A JP 2020092030A
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- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
- B60L50/72—Constructional details of fuel cells specially adapted for electric vehicles
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- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/31—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for starting of fuel cells
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Abstract
Description
図1は、燃料電池システムの一例を示す構成図である。燃料電池システム9は、例えば燃料電池車に搭載され、第1発電システム9a、第2発電システム9b、ECU1、外気温センサ90、インバータ(INV)43、モータ44、及びスイッチ45a,45bを有する。なお、燃料電池車は車両の一例である。
図2は、燃料電池スタック10a,10bの発電停止時のECU1の処理の一例を示すフローチャートである。なお、本処理の開始前、燃料電池スタック10a,10bは発電中であると仮定する。
図3は、燃料電池スタック10a,10bの第1配置例を示す図である。図3は、燃料電池車に搭載された燃料電池システム9の燃料電池スタック10a,10bを水平方向から視たときの様子を示す。なお、符号Dgは鉛直下方を示す。
図4は、燃料電池スタック10a,10bの第2配置例を示す図である。図4において、図3と共通する構成には同一の符号を付し、その説明は省略する。
図5は、燃料電池システム9の再始動処理の一例を示すフローチャートである。本処理の開始前、図2に示される処理により燃料電池スタック10a,10bは発電を停止している。また、燃料電池スタック10a,10bの配置は、第1配置例または第2配置例のとおりである。
図6は、単セル110a,110bの数が異なる燃料電池スタック10a,10bの配置例を示す図である。図6において、図4と共通する構成には同一の符号を付し、その説明は省略する。
上記のステップSt3の掃気処理において、燃料電池スタック10a,10bの掃気条件は同一であってもよいが、相違してもよい。掃気条件としては、エアコンプレッサ30a,30bが、掃気ガスであるエアを送出する時間(以下、「掃気時間」と表記)やエアの流速が挙げられる。
上述したように、氷点下で燃料電池システム9を再始動する場合、酸化剤ガス排出マニホルド101a内の水分が少ない燃料電池スタック10aの発電性能は、酸化剤ガス排出マニホルド101b内の水分が多い燃料電池スタック10bの発電性能より高くなる。しかし、高温環境で燃料電池システム9を再始動する場合、酸化剤ガス排出マニホルド101a,101b内の水分が少ないほど、単セル110a,110b内の電解質膜が乾燥しやすい。
上述した各実施例において、各燃料電池スタック10a,10bの排出方向Da_out,Db_outの鉛直下方Dgに対する角度θa,θbが一定である場合を挙げたが、角度θa,θbは変化する場合もある。例えば燃料電池スタック10a,10bの酸化剤ガス排出マニホルド101a,101bの鉛直下方Dgに対する角度θa,θbの大小関係は、燃料電池車の車体の傾きによっては逆転することが考えられる。そこで、ECU1は、車体の傾きに応じて、最初に発電を開始させる燃料電池スタック10a,10bを選択してもよい。
上述した各例において、ECU1は、2つの燃料電池スタック10a,10bの発電開始を制御するが、3つの燃料電池スタックを含む燃料電池システム9においても、これと同様の制御を行う。
8 車体
9 燃料電池システム
10a,10b 燃料電池スタック
30a,30b エアコンプレッサ(第1補機及び第2補機)
36a,36b インジェクタ(第1補機及び第2補機)
45a,45b スイッチ
92,93 傾斜センサ(第1及び第2検出部)
101a,101b 酸化剤ガス排出マニホルド(排出マニホルド)
110a,110b 単セル
Claims (12)
- 反応ガスの化学反応により発電する第1燃料電池スタック及び第2燃料電池スタックと、
前記第1燃料電池スタックの発電に用いられる第1補機と、
前記第2燃料電池スタックの発電に用いられる第2補機と、
前記第1補機及び前記第2補機の動作を制御する制御装置とを有し、
前記第1燃料電池スタック及び前記第2燃料電池スタックは、それぞれ、前記反応ガスを排出するための排出マニホルドを有し、
前記制御装置は、前記第1燃料電池スタック及び前記第2燃料電池スタックの発電の停止後、前記第1燃料電池スタック及び前記第2燃料電池スタックのうち、前記排出マニホルドから排出される前記反応ガスの排出方向が鉛直下方により近い一方の燃料電池スタックが、他方の燃料電池スタックより先に発電を開始するように、前記第1補機及び前記第2補機の動作を制御することを特徴とする燃料電池システム。 - 前記制御装置は、
前記第1燃料電池スタック及び前記第2燃料電池スタックの外気温を第1閾値と比較し、
比較の結果、前記外気温が前記第1閾値より低い場合、前記一方の燃料電池スタックが、前記他方の燃料電池スタックより先に発電を開始するように、前記第1補機及び前記第2補機の動作を制御することを特徴とする請求項1に記載の燃料電池システム。 - 前記制御装置は、前記一方の燃料電池スタックが発電を開始した後、前記他方の燃料電池スタックの温度と第2閾値を比較し、
比較の結果、前記他方の燃料電池スタックの温度が前記第2閾値より高くなった場合、前記他方の燃料電池スタックが発電を開始するように、前記第1補機及び前記第2補機の動作を制御することを特徴とする請求項1または2に記載の燃料電池システム。 - 前記一方の燃料電池スタックの前記排出方向は、鉛直下方に一致することを特徴とする請求項1乃至3の何れかに記載の燃料電池システム。
- 前記第1燃料電池スタック及び前記第2燃料電池スタックは、それぞれ、複数の単セルを有し、
前記一方の燃料電池スタックの前記複数の単セルの数は、前記他方の燃料電池スタックの前記複数の単セルの数より少ないことを特徴とする請求項1乃至4の何れかに記載の燃料電池システム。 - 前記第1補機は、前記第1燃料電池スタックの発電の停止後、前記第1燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第2補機は、前記第2燃料電池スタックの発電の停止後、前記第2燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第1補機及び前記第2補機のうち、前記一方の燃料電池スタックの前記排出マニホルドを掃気する一方の補機は、前記他方の燃料電池スタックの前記排出マニホルドを掃気する他方の補機より長い時間、かつ、前記他方の補機と同じ流速で掃気ガスを送出することを特徴とする請求項1乃至5の何れかに記載の燃料電池システム。 - 前記第1補機は、前記第1燃料電池スタックの発電の停止後、前記第1燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第2補機は、前記第2燃料電池スタックの発電の停止後、前記第2燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第1補機及び前記第2補機のうち、前記一方の燃料電池スタックの前記排出マニホルドを掃気する一方の補機は、所定時間内で、前記他方の燃料電池スタックの前記排出マニホルドを掃気する他方の補機より高い流速で掃気ガスを送出することを特徴とする請求項1乃至5の何れかに記載の燃料電池システム。 - 前記第1補機は、前記第1燃料電池スタックの発電の停止後、前記第1燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第2補機は、前記第2燃料電池スタックの発電の停止後、前記第2燃料電池スタックの前記排出マニホルドに掃気ガスを送出することにより前記排出マニホルドを掃気し、
前記第1補機及び前記第2補機のうち、前記一方の燃料電池スタックの前記排出マニホルドを掃気する一方の補機は、前記他方の燃料電池スタックの前記排出マニホルドを掃気する他方の補機より長い時間、かつ、前記他方の燃料電池スタックの前記排出マニホルドを掃気する他方の補機より高い流速で掃気ガスを送出することを特徴とする請求項1乃至5の何れかに記載の燃料電池システム。 - 前記第1燃料電池スタックまたは前記第2燃料電池スタックの前記排出方向の鉛直下方に対する傾きを検出する第1検出部を有し、
前記制御装置は、前記第1検出部が検出した傾きに基づき、前記第1燃料電池スタック及び前記第2燃料電池スタックの何れの前記排出方向が鉛直下方により近いかを判定することを特徴とする請求項1乃至8の何れかに記載の燃料電池システム。 - 前記燃料電池システムが搭載される車両の傾きを検出する第2検出部を有し、
前記制御装置は、前記第2検出部が検出した傾きに基づき、前記第1燃料電池スタック及び前記第2燃料電池スタックの何れの前記排出方向が鉛直下方により近いかを判定することを特徴とする請求項1乃至8の何れかに記載の燃料電池システム。 - 前記第1燃料電池スタック及び前記第2燃料電池スタックは、前記車両の車体に対する前記排出方向の角度が同一となるように前記車体に設置されていることを特徴とする請求項10に記載の燃料電池システム。
- 前記第1燃料電池スタック及び前記第2燃料電池スタックは、前記車両の車体に対する前記排出方向の角度が相違するように前記車体に設置されていることを特徴とする請求項10に記載の燃料電池システム。
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