JP2019114485A - 燃料電池システム、移動体及び排ガス排出制御方法 - Google Patents
燃料電池システム、移動体及び排ガス排出制御方法 Download PDFInfo
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Abstract
Description
図1は、燃料電池搭載車両10の構成を模式的に示す説明図である。燃料電池搭載車両10は、燃料電池システム11と、制御部110と、スタートスイッチ120と、二次電池130と、電力分配コントローラ140と、駆動モータ150と、ドライブシャフト160と、動力分配ギア170と、速度センサ175と、車輪180と、を備える。燃料電池システム11は、燃料電池100と、排ガス流路410と、サイレンサー470とを備える。燃料電池システム11の詳しい説明については、後述する。
第1実施形態では、制御部110は、外気温Taが低い時の方が、高い時よりもバイパス流路に流すバイパスエアの流量が多く、あるいは、ほぼ同等、すなわち、外気温Taが低い第1の温度におけるバイパスエアの流量が、外気温Taが第1の温度よりも高い第2の温度におけるバイパスエアの流量以上となるように、バイパスエアの流量を制御している。第2実施形態では、制御部110は、燃料電池100から排出される冷媒の温度から排ガスの温度を取得し、排ガスの温度と外気温とを用いて、バイパス流路450に流すバイパスエアの流量を取得する。
第3実施形態では、制御部110は、燃料電池100から排出される冷媒の温度から排ガスの温度を取得し、排ガスの温度に対応する霧発生温度を取得し、霧発生温度における飽和水蒸気量と排ガスの温度における飽和水蒸気量との比を用いてバイパス流路450に流すバイパスエアの流量を取得する。そのため、霧の発生の抑制をより精密に制御する。排ガスの温度は、排ガス流路410の温度センサを設けて該温度センサが直接取得しても良い。また、排ガス温度と冷媒の温度がほぼ等しいことを利用して、制御部110は、冷媒の温度を排ガスの温度とみなして利用しても良い。
制御部110は、第2実施形態において、ステップS150、S170、S180の代わりに、図3のステップS50、S70、S80を実行しても良い。制御部110は、冷媒の温度Tclが高く霧が発生しやすいときに、第1実施形態の霧の発生を抑制し、あるいは目立ちにくくする制御を実行できる。ステップS50において用いられるマップは、図4に示すマップと同じものが使用でき、マップを格納するためのメモリ容量を少なくできる。
11…燃料電池システム
100…燃料電池
110…制御部
120…スタートスイッチ
130…二次電池
140…電力分配コントローラ
150…駆動モータ
160…ドライブシャフト
170…動力分配ギア
175…速度センサ
180…車輪
200…燃料ガス供給回路
210…燃料ガスタンク
220…燃料ガス供給流路
230…燃料ガス排気流路
240…燃料ガス還流流路
250…メインバルブ
260…レギュレーター
270…インジェクタ
280…気液分離器
290…還流ポンプ
300…エア供給回路
310…エアクリーナ
320…エア供給流路
330…エアコンプレッサ
340…インタクーラ
350…スタック入口バルブ
375…大気圧センサ
380…外気温センサ
385…エアフローメータ
390…供給ガス温度センサ
395…供給ガス圧力センサ
400…排ガス回路
410…排ガス流路
420…調圧バルブ
430…燃料ガス排出流路
440…排気排水バルブ
450…酸化剤ガスバイパス流路(バイパス流路)
455…バイパス流路調整弁
470…サイレンサー
500…冷却回路
510…冷媒供給流路
515…冷媒排出流路
520…ラジエータ流路
525…ウォーターポンプ
530…ラジエータ
535…ラジエータファン
540…冷媒バイパス流路
545…三方バルブ
550…温度センサ
Claims (9)
- 移動体に搭載された燃料電池システムであって、
エアコンプレッサと、
前記エアコンプレッサから空気が供給される燃料電池と、
前記燃料電池からの排ガスを排出する排ガス流路と、
前記エアコンプレッサと前記排ガス流路とを連通するバイパス流路と、
前記バイパス流路への空気の供給量を調節するバイパス流路調整弁と、
外気温を取得する外気温センサと、
前記移動体の速度を取得する速度センサと、
前記燃料電池の運転を含む燃料電池システムの制御を行う制御部と、
を備え、
前記制御部は、
前記外気温が外気温判定閾値以下であり、かつ前記移動体の速度が判定速度以下である場合に、前記エアコンプレッサの駆動量と前記バイパス流路調整弁の開閉とを制御して前記バイパス流路に流すバイパス工アの流量を増大する霧抑制処理を実施し、前記霧抑制処理において、前記増大したバイパスエアの流量は、前記外気温判定閾値以下の第1温度における流量より、前記第1温度より低い第2温度における流量の方が大きい、
燃料電池システム。 - 請求項1に記載の燃料電池システムであって、さらに、
前記燃料電池から排出される排ガスの温度を取得する温度取得部を備え、
前記制御部は、さらに、前記外気温が前記外気温判定閾値以下であり、かつ前記移動体の速度が前記判定速度以下である場合に加えて、前記排ガスの温度が排ガス温度判定閾値以上のときに、前記霧抑制処理を実施する、
燃料電池システム。 - 請求項2に記載の燃料電池システムであって、
前記燃料電池から排出される冷媒の温度を測定する温度センサを備え、
前記温度取得部は、前記燃料電池から排出される冷媒の温度を用いて前記排ガスの温度を取得する、燃料電池システム。 - 請求項2または3に記載の燃料電池システムであって、
前記制御部は、
前記外気温を用いて、飽和水蒸気量の水蒸気を含む排ガスが排出されたときに霧を発生させる最低の温度である霧発生温度を取得し、
前記霧発生温度における飽和水蒸気量と、前記排ガスの温度における飽和水蒸気量と、の比を用いて前記バイパスエアの目標流量を取得し、前記霧抑制処理を実施する、燃料電池システム。 - 請求項1から請求項4のいずれか一項に記載の燃料電池システムを搭載した移動体。
- 燃料電池システムを搭載した移動体から排出される排ガスから生じる霧を目立ち難くする排ガス排出制御方法であって、
外気温を取得し、
移動体の速度を取得し、
空気を燃料電池に供給し、
前記外気温が外気温判定閾値以下であり、かつ、前記移動体の速度が判定速度以下の場合に、空気を前記燃料電池ではなくてバイパス流路に流すバイパスエアの流量について、前記外気温判定閾値以下の第1温度における流量より、前記第1温度より低い第2温度における流量の方が大きくなるように前記バイパスエアの流量を制御する霧抑制処理を実施し、
前記バイパスエアと前記燃料電池から排出される排ガスとを混合して排出する、
排ガス排出制御方法。 - 請求項6に記載の排ガス排出制御方法であって、
前記燃料電池から排出される排ガスの温度を取得し、
さらに、前記外気温が前記外気温判定閾値以下であり、かつ前記移動体の速度が前記判定速度以下である場合に加えて、前記排ガスの温度が排ガス温度判定閾値以上のときに、前記霧抑制処理を実施する、排ガス排出制御方法。 - 請求項7に記載の排ガス排出制御方法であって、
前記燃料電池から排出される冷媒の温度を測定する温度センサで測定された温度を用いて前記排ガスの温度を取得する、排ガス排出制御方法。 - 請求項7または8に記載の排ガス排出制御方法であって、
前記外気温から、飽和水蒸気量の水蒸気を含む排ガスが排出されたときに霧を発生させる最低の温度である霧発生温度を取得し、
前記霧発生温度における飽和水蒸気量と、前記排ガスの温度における飽和水蒸気量と、の比を用いて前記バイパスエアの目標流量を取得し、前記霧抑制処理を実施する、排ガス排出制御方法。
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