JP2017001498A - ハイブリッド車両 - Google Patents
ハイブリッド車両 Download PDFInfo
- Publication number
- JP2017001498A JP2017001498A JP2015116496A JP2015116496A JP2017001498A JP 2017001498 A JP2017001498 A JP 2017001498A JP 2015116496 A JP2015116496 A JP 2015116496A JP 2015116496 A JP2015116496 A JP 2015116496A JP 2017001498 A JP2017001498 A JP 2017001498A
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- Prior art keywords
- value
- power
- charging
- secondary battery
- battery
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- Granted
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- 238000002485 combustion reaction Methods 0.000 claims description 11
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/93—Conjoint control of different elements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Charge By Means Of Generators (AREA)
Abstract
【解決手段】ハイブリッド車両100において、ECU26は、電池16の残容量が所定値以下である場合には、エンジン2および車両駆動装置22を用いて電池16を強制的に充電する強制充電制御を実行する。また、評価値が充電過多による電池16の劣化の度合いを示す場合において、ECU26は、ハイブリッド車両100の停車中に強制充電制御を実行する場合に、評価値の絶対値が第1の閾値以下であるときは、電池16を充電する電力を第1の電力とし、評価値の絶対値が第1の閾値より大きいときは、電池16を充電する電力を第1の電力よりも小さい第2の電力とする。
【選択図】図1
Description
<1.ハイブリッド車両の構成>
図1は、この発明の実施の形態によるハイブリッド車両の全体構成を説明するブロック図である。図1を参照して、ハイブリッド車両100は、エンジン2と、車両駆動装置22と、伝達ギヤ8と、駆動軸12と、車輪14と、電池16と、ECU(Electronic Control Unit)26とを備える。
ハイブリッド車両100において、電池16の劣化度合いの評価は評価値ΣD(N)により行われる。評価値ΣD(N)は、各周期Δtにおいて電池16に生じたハイレート劣化の程度を示すダメージ値D(N)を積算することで算出される。ダメージ値D(N)は、周期Δtにおいて軽減されるハイレート劣化の程度を示すダメージ値D(−)と、周期Δtにおいて増加するハイレート劣化の程度を示すダメージ値D(+)とを考慮することで算出される。
式(1)において、αは忘却係数を示し、Δtは図2に示す処理を繰り返して行うときの周期Δtを示す。ハイブリッド車両100においては、電池16の温度とSOCとが特定されれば忘却係数を特定することができるテーブルが不図示のメモリに記憶されている。このテーブルは、電池16の温度、SOC、および忘却係数の関係について予め実験が行われることで作成されている。ECU26は、このテーブルを参照することで、忘却係数を算出することができる。
式(2)において、αおよびΔtは、式(1)と同様である。D(N−1)は、直前の周期Δtにおいて算出されたダメージ値を示す。初期値としてのD(0)は、例えば、0とすることができる。式(2)から分かる通り、忘却係数αが大きいほど、周期Δtが長いほどダメージ値D(−)が大きくなる。
式(3)において、Bは電流係数を示し、Cは限界しきい値を示す。Iは電流値を示し、ステップS100にて取得した電流Iの電流値が用いられる。Δtは図2に示す処理を繰り返して行うときの周期Δtを示す。式(3)から分かる通り、電流Iの電流値が大きいほど、周期Δtが長いほどダメージ値D(+)は大きくなる。なお、電池16が放電している場合には、ダメージ値D(+)は正の値となる一方、電池16が充電されている場合には、ダメージ値D(+)は負の値となる。電池16が放電している場合には、電流Iが正の値となり、電池16が充電されている場合には、電流Iが負の値となるからである。
式(4)において、D(N)は、今回の周期におけるダメージ値である。D(N−1)は、直前の周期Δtにおけるダメージ値である。初期値としてのD(0)は、例えば、0とすることができる。D(−)およびD(+)は、それぞれダメージ値Dの減少量および増加量を示し、ステップS140,S160で算出された値が用いられる。
ここで、ΣD(N)は評価値ΣD(N)の今回の周期Δtにおける演算値であり、ΣD(N−1)は評価値ΣD(N)の直前の周期Δtにおける演算値である。γ減衰係数であり、ηは補正係数である。ΣD(N−1)は、直前の周期Δtにおける演算完了後に不図示のメモリに記憶され、今回の周期Δtにおいてメモリから読み出される。減衰係数γは1よりも小さい値に設定される。時間の経過に伴うイオンの拡散によって塩濃度の偏りが緩和されるので、今回の周期Δtにおいて評価値ΣD(N)を算出するときに、直前の周期Δtにおいて算出された評価値ΣD(N−1)が減少していることを考慮するものである。補正係数ηは適宜設定される。
図3は、強制充電制御における処理を示すフローチャートである。このフローチャートにより示される処理は、図2に示されるフローチャートに示される処理と並行に実行される。図3を参照して、ECU26は、電池16のSOCが所定値V1以下となっているか否かを判断する(ステップS200)。SOCが所定値V1以下ではないと判断されると(ステップS200においてNO)、再びステップS200の処理が実行される。
実施の形態1においては、評価値ΣD(N)が制限開始閾値を下回るのに応じて、入力電力上限値Winは制限された。実施の形態2においては、制限開始閾値が設けられておらず、評価値ΣD(N)が減少するのに応じて、入力電力上限値Winが徐々に制限される例について説明する。
以上、この発明の実施の形態として実施の形態1を説明した。しかしながら、この発明は、他にも種々の実施の形態に適用することができる。次に、種々の他の実施の形態のうちの一部を説明する。
Claims (5)
- ハイブリッド車両であって、
内燃機関と、
電力を受けて前記ハイブリッド車両の駆動力を発生するとともに前記内燃機関の動力により発電する車両駆動装置と、
前記車両駆動装置との間で電力を入出力する二次電池と、
前記二次電池に対して入出力される電流を検出する電流センサと、
前記二次電池の充放電を制御するとともに、前記電流センサの検出値を用いて、前記充放電に伴う前記二次電池の塩濃度の偏りに起因した前記二次電池の劣化の度合いを示す評価値を算出する制御装置とを備え、
前記制御装置は、前記二次電池の残容量が第1の所定値以下である場合には、前記内燃機関および前記車両駆動装置を用いて、前記残容量が前記第1の所定量よりも大きい第2の所定量に上昇するまで前記二次電池を強制的に充電する強制充電制御を実行し、
前記強制充電制御の実行中は、前記内燃機関の停止が禁止され、
前記二次電池の劣化の進行に伴い前記評価値の絶対値は増大し、
前記評価値が充電過多による前記二次電池の劣化の度合いを示す場合において、
前記制御装置は、前記ハイブリッド車両の停車中に前記強制充電制御を実行する場合に、前記評価値の絶対値が第1の閾値以下であるときは、前記二次電池を充電する電力を第1の電力とし、前記評価値の絶対値が前記第1の閾値より大きいときは、前記二次電池を充電する電力を前記第1の電力よりも小さい第2の電力とする、ハイブリッド車両。 - 前記制御装置は、前記ハイブリッド車両の停車中に前記強制充電制御を実行する場合に、前記評価値の絶対値が前記第1の閾値よりも大きい第2の閾値より大きいときは、前記二次電池を充電する電力を前記第2の電力よりも小さい第3の電力とする、請求項1に記載のハイブリッド車両。
- 前記制御装置は、前記ハイブリッド車両の停車中に前記強制充電制御を実行する場合に、前記評価値の絶対値が前記第1の閾値より大きいときは、前記評価値の絶対値と前記第1の閾値との差が拡大するに連れて、前記二次電池を充電する電力を小さくする、請求項1に記載のハイブリッド車両。
- 前記二次電池には、入力される電力の制限値を示す入力電力上限値が設定されており、
前記制御装置は、前記ハイブリッド車両の停車中に前記強制充電制御を実行する場合に、前記評価値の絶対値が前記第1の閾値よりも大きい第3の閾値より大きいときは、前記評価値の絶対値が前記第3の閾値以下であるときよりも前記入力電力上限値を制限する、請求項1に記載のハイブリッド車両。 - 前記二次電池には、入力される電力の制限値を示す入力電力上限値が設定されており、
前記制御装置は、前記評価値の絶対値が増大するに連れて前記入力電力上限値を制限し、前記二次電池を充電する電力が前記第2の電力である場合には、前記二次電池を充電する電力が前記第1の電力である場合よりも、前記入力電力上限値を緩やかに制限する、請求項1に記載のハイブリッド車両。
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