WO2022254646A1 - 車両の制御方法及び車両の制御装置 - Google Patents
車両の制御方法及び車両の制御装置 Download PDFInfo
- Publication number
- WO2022254646A1 WO2022254646A1 PCT/JP2021/021142 JP2021021142W WO2022254646A1 WO 2022254646 A1 WO2022254646 A1 WO 2022254646A1 JP 2021021142 W JP2021021142 W JP 2021021142W WO 2022254646 A1 WO2022254646 A1 WO 2022254646A1
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- WIPO (PCT)
- Prior art keywords
- fuel cut
- vehicle
- internal combustion
- combustion engine
- lockup clutch
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 14
- 239000000446 fuel Substances 0.000 claims abstract description 90
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims description 40
- 230000000994 depressogenic effect Effects 0.000 claims 2
- 238000011084 recovery Methods 0.000 abstract description 18
- 230000001133 acceleration Effects 0.000 abstract description 8
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
-
- 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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a vehicle control method and a vehicle control device.
- Patent Document 1 for example, no consideration is given to the case where the vehicle suddenly decelerates immediately after the fuel cut is started. That is, in Patent Document 1, when a situation arises in which the supply of fuel to the internal combustion engine is restarted immediately after the fuel cut is started, the torque of the internal combustion engine, which is decreasing due to the stoppage of fuel injection, reverses to increase. There is a risk that a reverse torque fluctuation will occur and the drivability will deteriorate.
- the vehicle of the present invention resumes fuel supply to the internal combustion engine when the lockup clutch of the torque converter is released during fuel cut to stop fuel supply to the internal combustion engine. Then, the vehicle of the present invention prohibits the fuel cut when it is predicted that the lockup clutch will be released after a predetermined time has elapsed when the fuel cut is started.
- the vehicle of the present invention can avoid torque fluctuations (driving force fluctuations) of the internal combustion engine caused by fuel cut recovery, suppress changes in acceleration in the longitudinal direction of the vehicle, and avoid deterioration of drivability. .
- FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a vehicle powertrain to which the present invention is applied; 4 is a timing chart showing changes in various parameters before and after fuel cut recovery in a comparative example; 4 is a timing chart showing an example of changes in various parameters before and after fuel cut recovery of a vehicle to which the present invention is applied; 4 is a timing chart showing an example of changes in various parameters before and after fuel cut recovery of a vehicle to which the present invention is applied; 4 is a flow chart showing an example of the control flow of a vehicle to which the present invention is applied;
- FIG. 1 is an explanatory diagram schematically showing the schematic configuration of the powertrain of a vehicle such as an automobile to which the present invention is applied.
- the internal combustion engine 1 transmits driving force (rotational torque) to the output shaft 3 via the transmission unit 2 .
- the internal combustion engine 1 is, for example, a multi-cylinder spark ignition internal combustion engine, and a fuel injection valve 4 is provided for each cylinder.
- Fuel injection control of the fuel injection valve 4 and various controls of the internal combustion engine 1 are performed by an engine controller (ECU) 5 .
- the engine controller 5 corresponds to a fuel supply control section.
- the transmission unit 2 includes a torque converter 6 to which a rotation shaft (crankshaft) (not shown) of the internal combustion engine 1 is connected, and a continuously variable transmission (CVT) 7 as an automatic transmission that changes the output rotation of the torque converter 6. , and an auxiliary transmission 8 that changes the output rotation of the continuously variable transmission 7 . Since the transmission unit 2 has the auxiliary transmission 8 in addition to the continuously variable transmission 7, a wide range of total gear ratios can be set.
- the torque converter 6 includes a pump impeller (not shown) connected to the rotating shaft of the internal combustion engine 1, a turbine runner (not shown) connected to the input shaft of the continuously variable transmission 7, the pump impeller and the turbine runner. and a lockup clutch 9 that can be connected to the
- the torque converter 6 transmits torque via hydraulic oil interposed between the pump impeller and the turbine runner.
- the lockup clutch 9 directly connects the pump impeller and the turbine runner when engaged, and allows relative rotation of the pump impeller and turbine runner when disengaged.
- the torque converter 6, the continuously variable transmission 7, and the auxiliary transmission 8 are provided on the path for transmitting the rotation of the internal combustion engine 1 to the drive wheels.
- the internal combustion engine 1 is a drive source for drive wheels of the vehicle.
- TCU transmission controller
- the continuously variable transmission 7 is, for example, a belt-type continuously variable transmission, and the gear ratio is continuously controlled by the transmission controller 10 mainly based on the accelerator opening and the vehicle speed.
- the sub-transmission 8 is, for example, a planetary gear type automatic transmission having a forward two-speed shift function.
- the engine controller 5 and the transmission controller 10 are known digital computers equipped with a CPU, ROM, RAM, and input/output interfaces.
- the engine controller 5 and the transmission controller 10 are connected via a CAN communication line capable of exchanging information.
- the engine controller 5 includes a vehicle speed sensor 11 for detecting the vehicle speed of the vehicle, a crank angle sensor 12 for detecting the crank angle of the crankshaft, an accelerator opening sensor 13 as an accelerator opening detector for detecting the depression amount of the accelerator pedal, Detection signals from various sensors such as an acceleration sensor 14 for detecting vehicle acceleration are input.
- the engine controller 5 performs a fuel cut to stop the fuel supply to the internal combustion engine 1 under predetermined conditions when the accelerator opening becomes zero (accelerator off) while the vehicle is running. That is, the internal combustion engine 1 can cut fuel when a predetermined fuel cut permission condition is satisfied. Fuel cut is canceled when the engine speed drops below a predetermined recovery speed. Suspension of fuel cut means resumption of fuel supply (fuel cut recovery).
- the recovery speed is the engine speed of the internal combustion engine 1 that serves as a reference for fuel cut and fuel cut recovery.
- the engine controller 5 executes fuel cut when the accelerator opening is zero and the engine speed exceeds the recovery speed. Further, the engine controller 5 executes fuel cut recovery when the engine speed falls below a predetermined recovery speed during fuel cut or when the lockup clutch 9 is released during fuel cut.
- a detection signal is input to the transmission controller 10 from a shift sensor 15 or the like that detects the operating position of the shift lever.
- the transmission controller 10 When the accelerator pedal is released while the vehicle is running with the lockup clutch 9 engaged, the transmission controller 10 outputs a signal instructing release of the lockup clutch 9 according to operating conditions such as the running speed of the vehicle. .
- the transmission controller 10 outputs a command to release the lockup clutch 9, for example, when the vehicle speed drops below a predetermined lockup release speed set in advance.
- the lockup release speed is a vehicle speed threshold at which the lockup clutch 9 is released.
- FIG. 2 is a timing chart showing changes in various parameters before and after fuel cut recovery in a comparative example.
- Time t1 in FIG. 2 is the accelerator off timing when the amount of depression of the accelerator pedal becomes "0".
- Time t2 in FIG. 2 is the timing at which fuel cut is started.
- Time t3 in FIG. 2 is the timing at which the vehicle speed becomes equal to or lower than the lockup release speed.
- the engine controller 5 prohibits fuel cut if it is predicted that the lockup clutch 9 will be released after a predetermined time has elapsed. Specifically, the engine controller 5 predicts (calculates) the vehicle speed after a predetermined time, and prohibits fuel cut when the predicted (calculated) vehicle speed after the predetermined time is equal to or lower than the lockup release speed.
- FIGS. 3 and 4 are timing charts showing an example of changes in various parameters before and after fuel cut recovery in the embodiment described above.
- the vehicle speed indicated by the dashed line in FIGS. 3 and 4 is the predicted value of the vehicle speed after a predetermined time (for example, one second) from that point.
- Time t1 in FIGS. 3 and 4 is the accelerator off timing when the depression amount of the accelerator pedal becomes "0".
- Time t2 in FIGS. 3 and 4 is the timing when the fuel cut permission condition is met.
- Time t2 in FIG. 3 is also the timing at which the predicted value of the vehicle speed after a predetermined time is predicted to be equal to or lower than the lockup release speed.
- Time t3 in FIGS. 3 and 4 is the timing at which the vehicle speed becomes equal to or lower than the lockup release speed.
- the fuel cut permission condition is satisfied at the timing of time t2, but the predicted value of the vehicle speed after a predetermined time is predicted to be equal to or lower than the lockup release speed at the timing of time t2, so fuel cut is performed at time t2. It is forbidden.
- the fuel cut permission condition is satisfied at the timing of time t2, and the predicted value of the vehicle speed after a predetermined time is predicted to be higher than the lockup release speed, so the fuel cut is permitted at the timing of time t2. be. That is, in FIG. 4, since it is predicted that the lockup clutch 9 will not be released immediately after time t2, fuel cut is started at time t2.
- the internal combustion engine 1 can avoid resuming fuel supply (fuel cut recovery) immediately after stopping fuel supply (fuel cut). Therefore, the vehicle can avoid torque fluctuations (driving force fluctuations) of the internal combustion engine 1 caused by fuel cut recovery, suppress changes in acceleration in the longitudinal direction of the vehicle, and avoid deterioration of drivability. .
- the internal combustion engine 1 can cut fuel as shown in FIG. 4, and suppress deterioration of fuel consumption. be able to.
- the vehicle speed after a predetermined time can be predicted (calculated), for example, based on the amount of change in vehicle speed in a predetermined unit time.
- the lockup clutch 9 is released as the vehicle speed decreases. Therefore, the greater the amount of deceleration (variation) in the vehicle speed in a predetermined unit time, the more likely it is that the lockup clutch 9 will be disengaged in a short period of time after the fuel cut.
- the transmission controller 10 can disengage the lockup clutch 9 with high accuracy. Since the vehicle speed after a predetermined time is calculated based on the amount of deceleration (change amount) of the vehicle speed, it can be predicted without being affected by the gear ratio of the automatic transmission.
- the automatic transmission is a continuously variable transmission, and the lockup clutch 9 can be released according to the timing at which the vehicle speed becomes equal to or lower than the lockup release speed, regardless of the timing at which the gear ratio changes.
- the automatic transmission is a stepped automatic transmission
- the lockup clutch 9 of the above-described embodiment locks up at the timing when the vehicle speed becomes equal to or lower than the lockup release speed regardless of the timing at which the gear ratio changes. Clutch 9 can be released.
- the automatic transmission is the continuously variable transmission 7, so the vehicle speed and the engine speed of the internal combustion engine 1 are not proportional. Therefore, the control of disengaging the lockup clutch 9 according to the vehicle speed is suitable for a vehicle equipped with the continuously variable transmission 7 .
- the gear ratio of the transmission unit 2 is set to an intermediate value between the highest and lowest possible settings, for example. set to the lower side than
- FIG. 5 is a flow chart showing the control flow of the vehicle of the embodiment described above.
- Step S1 is a step of calculating a predicted value of the vehicle speed after a predetermined time.
- Step S2 is a step of determining whether or not the accelerator opening is zero (accelerator off). If it is determined in step S2 that the accelerator opening is not zero (accelerator off), the process proceeds to step S3. If it is determined in step S2 that the accelerator opening is zero (accelerator off), the process proceeds to step S4.
- Step S3 is a step of performing normal fuel control for performing normal fuel injection according to the operating state.
- Step S4 is a step for determining whether or not the lockup clutch 9 is off.
- step S4 If it is determined in step S4 that the lockup clutch 9 is off, the process proceeds to step S5. If it is determined in step S4 that the lockup clutch 9 is not off, the process proceeds to step S6.
- Step S5 is a step of prohibiting fuel cut.
- Step S6 is a step for determining whether or not the predicted value of the vehicle speed is equal to or less than the lockup release speed. If it is determined in step S6 that the predicted value of the vehicle speed is equal to or less than the lockup release speed, the process proceeds to step S5. If it is determined in step S6 that the predicted value of the vehicle speed is greater than the lockup release speed, the process proceeds to step S7.
- Step S7 is a step of performing a fuel cut.
- the lockup release speed may be set to increase as the gear ratio decreases.
- the present invention can also be applied to an automatic transmission that is a stepped transmission.
- the above-described embodiments relate to a vehicle control method and a vehicle control device.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
Description
Claims (5)
- 内燃機関の回転を駆動輪に伝達する経路上に自動変速機及びトルクコンバータが設けられ、アクセルペダルが踏み込まれていないアクセルオフの状態で上記トルクコンバータに設けられたロックアップクラッチが締結された走行中に所定の条件が成立すると上記内燃機関への燃料供給を停止する燃料カットを実施し、上記燃料カット中に上記ロックアップクラッチが解放されると上記内燃機関への燃料供給を再開する車両の制御方法において、
上記燃料カットを開始する際に、所定時間経過後に上記ロックアップクラッチの解放が予測される場合は、上記燃料カットを禁止する車両の制御方法。 - 所定時間後の車速を予測し、予測した所定時間後の車速が上記ロックアップクラッチを解放するロックアップ解放速度以下の場合には、上記燃料カットを禁止する請求項1に記載の車両の制御方法。
- 所定の単位時間における車速の変化量に基づいて所定時間後の車速を予測する請求項2に記載の車両の制御方法。
- 上記自動変速機は、無段変速機である請求項1~3のいずれかに記載の車両の制御方法。
- 車両の駆動輪の駆動源となる内燃機関と、
上記内燃機関の回転を上記駆動輪に伝達する経路上に設けられた自動変速機及びトルクコンバータと、
アクセルペダルの踏み込み量を検出するアクセル開度検出部と、
上記アクセルペダルが踏み込まれていないアクセルオフの状態で上記トルクコンバータに設けられたロックアップクラッチが締結されている走行中に所定の条件が成立すると上記内燃機関への燃料供給を停止する燃料カットを実施し、上記燃料カット中に上記ロックアップクラッチが解放されると上記内燃機関への燃料供給を再開する燃料供給制御部と、を有し、
上記燃料供給制御部は、上記燃料カットを開始する際に、所定時間経過後に上記ロックアップクラッチの解放が予測される場合は、上記燃料カットを禁止する車両の制御装置。
Priority Applications (3)
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PCT/JP2021/021142 WO2022254646A1 (ja) | 2021-06-03 | 2021-06-03 | 車両の制御方法及び車両の制御装置 |
CN202180098454.5A CN117460882A (zh) | 2021-06-03 | 2021-06-03 | 车辆的控制方法以及车辆的控制装置 |
JP2023525272A JP7505647B2 (ja) | 2021-06-03 | 2021-06-03 | 車両の制御方法及び車両の制御装置 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008106841A (ja) * | 2006-10-25 | 2008-05-08 | Nissan Motor Co Ltd | 自動変速機の変速制御装置 |
JP2012047312A (ja) * | 2010-08-30 | 2012-03-08 | Daihatsu Motor Co Ltd | 車両の自動変速装置 |
JP2013060898A (ja) * | 2011-09-14 | 2013-04-04 | Nissan Motor Co Ltd | 車両駆動装置 |
JP2014173511A (ja) * | 2013-03-11 | 2014-09-22 | Honda Motor Co Ltd | 車両の制御装置 |
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2021
- 2021-06-03 JP JP2023525272A patent/JP7505647B2/ja active Active
- 2021-06-03 CN CN202180098454.5A patent/CN117460882A/zh active Pending
- 2021-06-03 WO PCT/JP2021/021142 patent/WO2022254646A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008106841A (ja) * | 2006-10-25 | 2008-05-08 | Nissan Motor Co Ltd | 自動変速機の変速制御装置 |
JP2012047312A (ja) * | 2010-08-30 | 2012-03-08 | Daihatsu Motor Co Ltd | 車両の自動変速装置 |
JP2013060898A (ja) * | 2011-09-14 | 2013-04-04 | Nissan Motor Co Ltd | 車両駆動装置 |
JP2014173511A (ja) * | 2013-03-11 | 2014-09-22 | Honda Motor Co Ltd | 車両の制御装置 |
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CN117460882A (zh) | 2024-01-26 |
JPWO2022254646A1 (ja) | 2022-12-08 |
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