JP7180509B2 - 燃料電池車両 - Google Patents
燃料電池車両 Download PDFInfo
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- JP7180509B2 JP7180509B2 JP2019071136A JP2019071136A JP7180509B2 JP 7180509 B2 JP7180509 B2 JP 7180509B2 JP 2019071136 A JP2019071136 A JP 2019071136A JP 2019071136 A JP2019071136 A JP 2019071136A JP 7180509 B2 JP7180509 B2 JP 7180509B2
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Description
[形態1]燃料電池車両であって、回生動作によって回生電力を生成可能であり、前記燃料電池車両を駆動する駆動モータと、カソードとアノードとを有し、前記駆動モータに電力を供給可能な燃料電池と、前記カソードに酸化ガスを送り込むコンプレッサと、前記燃料電池車両を制動する摩擦ブレーキと、前記駆動モータに電力を供給することと、前記燃料電池車両の余剰電力を蓄電することが可能な蓄電装置と、前記燃料電池内に滞留する滞留水の水量を推定する滞留水推定部と、推定した前記滞留水の水量が、予め定めた第1水量以上の場合に、前記コンプレッサによって前記酸化ガスを前記カソードに供給することによって前記滞留水を前記燃料電池外へ排出させる掃気処理であって前記燃料電池の発電を行う掃気処理を実行する掃気処理実行部と、前記摩擦ブレーキと前記駆動モータの回生動作による回生ブレーキとを利用して、前記燃料電池車両の制動要求を満足するように前記摩擦ブレーキと前記回生動作とを制御する制動制御部と、を備え、前記制動制御部は、前記制動要求に応じて前記燃料電池車両の制動を行っている期間において、(i)推定した前記滞留水の水量が前記第1水量よりも少ない予め定めた第2水量未満の場合には、前記回生動作による回生電力の上限制限電力を予め定めた第1の値以下に制限し、(ii)推定した前記滞留水の水量が前記第2水量以上の場合には、前記上限制限電力を前記第1の値よりも予め定めた値分低くした第2の値に設定する上限変更処理を実行する、燃料電池車両。この形態によれば、掃気処理によって燃料電池が発電する前の段階で、上限制限電力を予め定めた値分低く設定することで、掃気処理によって燃料電池が発電したことに伴って回生電力が減少することを抑制できる。これにより、制動トルクがより安定できる。
(2)上記形態であって、前記上限変更処理は、前記上限制限電力を前記第2の値に設定することで前記回生電力を減少させる必要がある場合に、前記回生動作を制御して前記回生電力を予め定めた条件を満たすように前記第2の値まで減少させる回生低減処理を含み、前記予め定めた条件は、前記回生動作による制動トルクである回生制動トルクの変化速度が、前記摩擦ブレーキによる制動トルクである摩擦制動トルクの変化速度以下であるという条件であり、前記制動制御部は、前記回生低減処理によって生じる前記回生制動トルクの減少に応じて、前記摩擦制動トルクを増加させる摩擦増加処理を実行してもよい。この形態によれば、上限制限電力を予め定めた値分低く設定することで回生電力を第2の値まで減少させる必要がある場合において、回生制動トルクの変化量を摩擦制動トルクで補うことができる。これにより、制動トルクを要求制動トルクにより近づけることができる。
(3)上記形態であって、前記予め定めた値は、前記制動を行っている期間に前記掃気処理を実行する際の前記燃料電池の発電電力の増加に起因する前記余剰電力の推定増加分以上の値に設定されてもよい。この形態によれば、制動トルクがより一層安定できる。
(4)上記形態であって、前記摩擦増加処理における前記摩擦制動トルクの増加量は、前記回生低減処理によって生じる前記回生制動トルクの減少量と同じ値に設定されてもよい。この形態によれば、回生制動トルクの減少分を摩擦制動トルクによって補うことができるので、制動トルクを要求制動トルクにより近づけることができる。
(5)上記形態であって、前記制動制御部は、前記上限変更処理の開始後、推定した前記滞留水が第2水量よりも少ない第3水量以下であり、かつ、制動要求が解除された場合に、前記上限変更処理を終了してもよい。この形態によれば、制動要求が解除された場合に上限変更処理を終了することで、回生制動トルクの変化速度と摩擦制動トルクの変化速度とを対応させるための制御を行うことなく、制動トルクがより一層安定できる。
本発明は、種々の形態で実現することが可能であり、上記の燃料電池システムの他に、例えば、燃料電池システムを搭載する燃料電池車両、燃料電池システムの制御方法、その制御方法を実現するコンピュータプログラム、そのコンピュータプログラムを記録した一時的でない記録媒体等の形態で実現することができる。
図1は、実施形態における燃料電池車両20の概略構成を示す説明図である。燃料電池車両20は、燃料電池システム30と、駆動モータ40と、摩擦ブレーキ50と、アクセルペダル70と、ブレーキペダル72と、車速検出部60と、前輪FWと、後輪RWとを備える。燃料電池システム30は、燃料電池100と、蓄電装置421と、車速検出部60と、制御装置80と、を備えている。
上記実施形態によれば、摩擦増加処理における摩擦制動トルクの増加量は、回生低減処理によって生じる回生制動トルクの減少量と同じ値に設定されていたがこれに限定されるものではない。例えば、制動トルクが要求制動トルクから大きく逸脱しない範囲で、摩擦制動トルクの増加量と回生制動トルクの減少量とを異なる値に設定してもよい。
Claims (5)
- 燃料電池車両であって、
回生動作によって回生電力を生成可能であり、前記燃料電池車両を駆動する駆動モータと、
カソードとアノードとを有し、前記駆動モータに電力を供給可能な燃料電池と、
前記カソードに酸化ガスを送り込むコンプレッサと、
前記燃料電池車両を制動する摩擦ブレーキと、
前記駆動モータに電力を供給することと、前記燃料電池車両の余剰電力を蓄電することが可能な蓄電装置と、
前記燃料電池内に滞留する滞留水の水量を推定する滞留水推定部と、
推定した前記滞留水の水量が、予め定めた第1水量以上の場合に、前記コンプレッサによって前記酸化ガスを前記カソードに供給することによって前記滞留水を前記燃料電池外へ排出させる掃気処理であって前記燃料電池の発電を行う掃気処理を実行する掃気処理実行部と、
前記摩擦ブレーキと前記駆動モータの回生動作による回生ブレーキとを利用して、前記燃料電池車両の制動要求を満足するように前記摩擦ブレーキと前記回生動作とを制御する制動制御部と、を備え、
前記制動制御部は、前記制動要求に応じて前記燃料電池車両の制動を行っている期間において、
(i)推定した前記滞留水の水量が前記第1水量よりも少ない予め定めた第2水量未満の場合には、前記回生動作による回生電力の上限制限電力を予め定めた第1の値以下に制限し、
(ii)推定した前記滞留水の水量が前記第2水量以上の場合には、前記上限制限電力を前記第1の値よりも予め定めた値分低くした第2の値に設定する上限変更処理を実行する、燃料電池車両。 - 請求項1に記載の燃料電池車両であって、
前記上限変更処理は、前記上限制限電力を前記第2の値に設定することで前記回生電力を減少させる必要がある場合に、前記回生動作を制御して前記回生電力を予め定めた条件を満たすように前記第2の値まで減少させる回生低減処理を含み、
前記予め定めた条件は、前記回生動作による制動トルクである回生制動トルクの変化速度が、前記摩擦ブレーキによる制動トルクである摩擦制動トルクの変化速度以下であるという条件であり、
前記制動制御部は、
前記回生低減処理によって生じる前記回生制動トルクの減少に応じて、前記摩擦制動トルクを増加させる摩擦増加処理を実行する、燃料電池車両。 - 請求項2に記載の燃料電池車両であって、
前記予め定めた値は、前記制動を行っている期間に前記掃気処理を実行する際の前記燃料電池の発電電力の増加に起因する前記余剰電力の推定増加分以上の値に設定される、燃料電池車両。 - 請求項2または請求項3に記載の燃料電池車両であって、
前記摩擦増加処理における前記摩擦制動トルクの増加量は、前記回生低減処理によって生じる前記回生制動トルクの減少量と同じ値に設定される、燃料電池車両。 - 請求項1から請求項4までのいずれか一項に記載の燃料電池車両であって、
前記制動制御部は、前記上限変更処理の開始後、推定した前記滞留水が前記第2水量よりも少ない予め定めた第3水量以下に低下し、かつ、前記制動要求が解除された場合に、前記上限変更処理を終了する、燃料電池車両。
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