JP7073870B2 - 始動制御装置 - Google Patents
始動制御装置 Download PDFInfo
- Publication number
- JP7073870B2 JP7073870B2 JP2018076237A JP2018076237A JP7073870B2 JP 7073870 B2 JP7073870 B2 JP 7073870B2 JP 2018076237 A JP2018076237 A JP 2018076237A JP 2018076237 A JP2018076237 A JP 2018076237A JP 7073870 B2 JP7073870 B2 JP 7073870B2
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- Prior art keywords
- engine
- motor generator
- control device
- torque
- electronic control
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Images
Classifications
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- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2300/00—Control related aspects of engine starting
- F02N2300/10—Control related aspects of engine starting characterised by the control output, i.e. means or parameters used as a control output or target
- F02N2300/104—Control of the starter motor torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2300/00—Control related aspects of engine starting
- F02N2300/20—Control related aspects of engine starting characterised by the control method
- F02N2300/2002—Control related aspects of engine starting characterised by the control method using different starting modes, methods, or actuators depending on circumstances, e.g. engine temperature or component wear
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
図1に示すように、ハイブリッドシステムは、駆動源として4気筒のエンジン10を備えている。エンジン10においては、各気筒に対して順番に燃料の噴射及び燃料の燃焼が行われる。また、エンジン10の気筒における吸気行程の開始から、圧縮行程及び膨張行程(燃焼行程)を経て、排気行程の終了に至るまでを、1燃焼サイクル(720CA)としたとき、4つの気筒の燃焼サイクルは、4分の1サイクル(180CA)ずつずれている。
上記実施形態のように、自動停止したエンジン10をモータジェネレータ20によってクランキングできるようにする場合、クランクシャフト10aの停止角CAsに拘らず、モータジェネレータ20でクランキングを開始できるように構成されることが好ましい。したがって、図2に示すように、モータジェネレータ20の出力特性に劣化が生じてなく、且つ、モータジェネレータ20に電力を供給する高圧バッテリ22の充電容量が十分(例えば50%以上)である場合のモータジェネレータ20の出力可能トルクTmg1が、クランクシャフト10aの停止角CAsに拘らず、始動トルクを上回るように、モータジェネレータ20が設計されることが一般的である。
・エンジン10とモータジェネレータ20との駆動連結の態様は、上記実施形態に限らない。また、エンジン10とモータジェネレータ20との間に、第1プーリ12、伝達ベルト13、及び第2プーリ14に加えて、複数のギア等で構成される減速機構や、駆動力伝達経路の断接を行うクラッチ等が介在されていてもよい。
・上記実施形態において必ずしも許容クランク角範囲CAaを算出しなくてもよい。例えば、エンジン10の最小始動トルクTs、モータジェネレータ20の出力可能トルクTmg、及びクランクシャフト10aの停止角CAsを変数とする関係式等を予め電子制御装置30の記憶部に記憶しておく。そして、この関係式によって導き出される数値に基づいて、停止角CAsが、エンジン10をモータジェネレータ20でクランキングして再始動できるクランク角の停止角の範囲内か範囲外かを判定してもよい。
Claims (6)
- 車両の駆動源としてエンジンと当該エンジンに駆動連結されたモータジェネレータとを備えているハイブリッドシステムに適用される始動制御装置であって、
予め定められた規定条件を満たしたときに前記エンジンにおける燃料噴射を停止させることで前記エンジンを自動停止させるとともに前記エンジンへの吸気量を制限する駆動制御部と、
前記エンジンが自動停止してクランクシャフトが停止したときのクランク角を、停止角として検出する停止角検出部とを備え、
前記駆動制御部は、前記停止角が、前記エンジンを前記モータジェネレータでクランキングして再始動できる前記クランク角の停止角の範囲を外れている場合には、前記エンジンの自動停止が開始されてから前記エンジンの気筒内が大気圧に対して負圧になっている期間として定められた筒内負圧期間が経過するまでに、前記モータジェネレータによって前記エンジンをクランキングさせる又は前記エンジンにおける燃料噴射を再開して前記エンジンを再始動させる
ことを特徴とする始動制御装置。 - 車両の駆動源としてエンジンと当該エンジンに駆動連結されたモータジェネレータとを備えているハイブリッドシステムに適用される始動制御装置であって、
予め定められた規定条件を満たしたときに前記エンジンにおける燃料噴射を停止させることで前記エンジンを自動停止させるとともに前記エンジンへの吸気量を制限する駆動制御部と、
前記エンジンを前記モータジェネレータでクランキングして再始動できるクランクシャフトにおけるクランク角の停止角の範囲を、許容クランク角範囲として算出する許容角算出部とを備え、
前記駆動制御部は、前記許容クランク角範囲が予め定められた規定範囲よりも小さい場合には、前記エンジンの自動停止が開始されてから前記エンジンの気筒内が大気圧に対して負圧になっている期間として定められた筒内負圧期間が経過するまでに、前記モータジェネレータによって前記エンジンをクランキングさせる又は前記エンジンにおける燃料噴射を再開して前記エンジンを再始動させる
ことを特徴とする始動制御装置。 - 前記モータジェネレータの出力可能トルクを算出するトルク算出部を備え、
前記許容角算出部は、前記出力可能トルク及び前記エンジンを自動停止しているときの単位時間あたりのエンジンの機関回転数の変化量に基いて、前記許容クランク角範囲を算出する
ことを特徴とする請求項2に記載の始動制御装置。 - 前記モータジェネレータの出力可能トルクを算出するトルク算出部と、
前記エンジンが所定の駆動状態であるときの燃料噴射量に基づいて前記エンジンを再始動するのに要する始動トルクを算出する始動トルク算出部とを備え、
前記駆動制御部は、前記出力可能トルクから前記始動トルクのうちの最小のトルクを減算した値が予め定められた閾値よりも小さい場合には、前記規定条件に拘らず、前記エンジンの自動停止を禁止する
ことを特徴とする請求項1~3のいずれか一項に記載の始動制御装置。 - 前記駆動制御部は、前記筒内負圧期間が経過するまでに前記モータジェネレータによって前記エンジンをクランキングさせてから、前記エンジンの気筒内の気圧が大気圧に対して再び負圧になる期間として予め定められている規定期間が経過した場合には、前記モータジェネレータによる前記エンジンのクランキングを停止することにより、前記エンジンを自動停止させる
ことを特徴とする請求項1~4のいずれか一項に記載の始動制御装置。 - 前記駆動制御部は、前記筒内負圧期間が経過するまでに前記モータジェネレータによって前記エンジンをクランキングさせた後、前記モータジェネレータに電力を供給するバッテリの充電容量が一定容量を下回った場合には、前記エンジンにおける燃料噴射を再開して前記エンジンを再始動させる
ことを特徴とする請求項1~5のいずれか一項に記載の始動制御装置。
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