JP7256153B2 - 電力システム - Google Patents
電力システム Download PDFInfo
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- JP7256153B2 JP7256153B2 JP2020152518A JP2020152518A JP7256153B2 JP 7256153 B2 JP7256153 B2 JP 7256153B2 JP 2020152518 A JP2020152518 A JP 2020152518A JP 2020152518 A JP2020152518 A JP 2020152518A JP 7256153 B2 JP7256153 B2 JP 7256153B2
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- fuel cell
- cell stack
- control device
- idling stop
- power
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- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
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- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- 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
- B60L50/71—Arrangement of fuel cells within vehicles specially adapted for electric vehicles
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- B60L50/75—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using propulsion power supplied by both fuel cells and batteries
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- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0053—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to fuel cells
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- B60L2260/00—Operating Modes
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Description
以下、本発明の第1実施形態に係る電力システムについて図面を参照しながら説明する。
図1は、本実施形態に係る電力システム1を搭載する車両Vの構成を示す図である。
燃料電池システム2は、燃料電池スタック20と、この燃料電池スタック20に水素及び空気を供給するシステム補機30と、燃料電池スタック20から排出されたガスの後処理を行う希釈器39と、を備える。
燃料電池スタック20の劣化に及ぼす影響は、第3アイドル停止処理、第1アイドル停止処理、及び第2アイドル停止処理の順で大きくなる。すなわち、第3アイドル停止処理では上述のように劣化抑制処理を行った後に燃料電池スタック20の発電を停止するため、燃料電池スタック20の劣化に及ぼす影響は最も小さい。また第2アイドル停止処理では、劣化抑制処理を行わずに燃料電池スタック20の発電を停止するため、燃料電池スタック20の劣化に及ぼす影響は最も大きい。
(1)制御装置9は、通常発電処理、第1アイドル停止処理、第2アイドル停止処理、及び第3アイドル停止処理の何れかを、車両V及び高圧バッテリBの状態に基づいて選択的に実行する。ここで燃料電池スタック20とそのシステム補機30とを合わせた燃料電池システムのネット出力を0以下にする3つのアイドル停止処理を比較する。第1アイドル停止処理では、システム補機30の運転及び燃料電池スタック20の発電を継続しながらネット出力を0以下にするため、電力システム1全体のエネルギ効率は第2及び第3アイドル停止処理よりも低いが、発電の再開にかかる時間は第2及び第3アイドル停止処理よりも短い。第3アイドル停止処理では、システム補機30の運転及び燃料電池スタック20の発電の両方を停止しネット出力を0にするため、発電の再開にかかる時間は第1及び第2アイドル停止処理よりも長いものの、エネルギ効率は第1及び第2アイドル停止処理よりも高い。また第2アイドル停止処理では、システム補機30の運転を継続しながら燃料電池スタック20による発電を停止しネット出力を0未満にするため、発電の再開にかかる時間は第3アイドル停止処理よりも短く、エネルギ効率は第1アイドル停止処理よりも高い。本実施形態では、制御装置9は、以上のような通常発電処理及び第1~第3アイドル停止処理を、車両V及び高圧バッテリBの状態に応じて選択的に実行することにより、エネルギ効率及び再起動性が悪化しないように、車両V及び高圧バッテリBの状態に応じた適切なアイドル停止処理を実行できる。
次に、本発明の第2実施形態に係る電力システムについて図面を参照しながら説明する。なお以下の第2実施形態に係る電力システムの説明において、第1実施形態に係る電力システム及びと同じ構成については同じ符号を付し、詳細な説明を省略する。
(9)本実施形態では、複数組の燃料電池システム2a~2cのうちネット出力を0以下にするアイドル停止対象を、各々の劣化度合いに基づいて選択することにより、各燃料電池システム2a~2cの劣化度合いを均一に近づけることができる。
1,1A…電力システム
M…走行用モータ(負荷、走行用モータ)
B…高圧バッテリ(バッテリ)
2,2a,2b,2c…燃料電池システム
20…燃料電池スタック
21…アノード流路
22…カソード流路
30…システム補機
3a…アノード系
3c…カソード系
23…エアポンプ
24…空気供給管(酸化剤ガス供給路)
27…スタックバイパス管(バイパス流路)
4…電力変換器
5…第1電力線
6…第2電力線
7…車両補機(負荷)
8…電圧変換器
9,9A…制御装置
Claims (9)
- 燃料ガスと酸化剤ガスとの電気化学反応により発電する燃料電池スタックと、
電力を消費することによって燃料ガス及び酸化剤ガスを供給するシステム補機と、
前記燃料電池スタックから出力される電力を蓄えるバッテリと、
前記燃料電池スタック又は前記バッテリから出力される電力を消費する負荷と、
前記燃料電池スタック及び前記システム補機を含む燃料電池システムを制御する制御装置と、
複数組の前記燃料電池システムと、を備える電力システムであって、
前記制御装置は、前記燃料電池スタックによって発電し前記燃料電池システムの電気出力であるネット出力を0より大きくする通常発電処理、前記システム補機の運転及び前記燃料電池スタックの発電を継続しながら前記ネット出力を0以下にする第1アイドル停止処理、前記システム補機の運転を継続しながら前記燃料電池スタックの発電を停止し前記ネット出力を0未満にする第2アイドル停止処理、及び前記システム補機の運転及び前記燃料電池スタックの発電の両方を停止し前記ネット出力を0にする第3アイドル停止処理の何れかを、前記電力システム及び前記バッテリの状態に基づいて実行するとともに、前記第1又は第2アイドル停止処理を実行する場合、前記複数組の燃料電池システムのうち最も劣化度合いが低いものに対して前記第1又は第2アイドル停止処理を実行することを特徴とする電力システム。 - 前記システム補機は、エアポンプと、前記エアポンプと前記燃料電池スタックとを接続する酸化剤ガス供給路と、前記酸化剤ガス供給路から分岐するバイパス流路と、を備え、
前記制御装置は、前記第1アイドル停止処理では、前記エアポンプから供給される酸化剤ガスの一部を前記バイパス流路に流し前記燃料電池スタックをバイパスさせ、前記燃料電池スタックによる極低負荷発電を継続することを特徴とする請求項1に記載の電力システム。 - 前記制御装置は、前記第2アイドル停止処理では、前記燃料電池スタックへの燃料ガス及び酸化剤ガスの少なくとも何れかの供給を停止することによって前記燃料電池スタックの発電を停止することを特徴とする請求項1又は2に記載の電力システム。
- 前記制御装置は、前記第3アイドル停止処理では、前記燃料電池スタックの酸化剤ガス流路内に不活性ガスを充填する劣化抑制処理を行った後、前記システム補機の運転及び前記燃料電池スタックの発電を停止することを特徴とする請求項1から3の何れかに記載の電力システム。
- 前記負荷は、車両を走行させるための走行用モータを含み、
前記制御装置は、前記通常発電処理、前記第1、第2、及び第3アイドル停止処理の何れかを、前記車両の状態及び前記バッテリの状態に基づいて選択的に実行することを特徴とする請求項1から4の何れかに記載の電力システム。 - 前記制御装置は、前記バッテリの充電率が所定値以上でありかつ前記車両が一時停止中である場合、前記第1アイドル停止処理を実行することを特徴とする請求項5に記載の電力システム。
- 前記制御装置は、前記バッテリの充電率が所定値以上でありかつ前記車両が下り坂の走行中である場合、前記第2アイドル停止処理を実行することを特徴とする請求項5又は6に記載の電力システム。
- 前記制御装置は、前記バッテリの充電率が所定値以上でありかつ前記車両が停車中である場合、前記第3アイドル停止処理を実行することを特徴とする請求項5から7の何れかに記載の電力システム。
- 前記制御装置は、前記第3アイドル停止処理を実行する場合、前記複数組の燃料電池システムのうち最も前記劣化度合が高いものをアイドル停止対象として選択することを特徴とする請求項1から8の何れかに記載の電力システム。
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