WO2016035138A1 - 車両のエンジン停止制御装置 - Google Patents
車両のエンジン停止制御装置 Download PDFInfo
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- WO2016035138A1 WO2016035138A1 PCT/JP2014/073052 JP2014073052W WO2016035138A1 WO 2016035138 A1 WO2016035138 A1 WO 2016035138A1 JP 2014073052 W JP2014073052 W JP 2014073052W WO 2016035138 A1 WO2016035138 A1 WO 2016035138A1
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- Prior art keywords
- stop control
- vehicle speed
- engine
- vehicle
- threshold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18018—Start-stop drive, e.g. in a traffic jam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18072—Coasting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- 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
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0833—Vehicle conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/12—Lateral speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2554/00—Input parameters relating to objects
- B60W2554/80—Spatial relation or speed relative to objects
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- 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
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
- F02N2200/0801—Vehicle speed
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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
- 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 engine stop control device that includes a restartable engine in a drive source and performs coast stop control for automatically stopping the engine before stopping.
- an engine stop control device for a vehicle that performs coast stop control for automatically stopping an engine when the vehicle speed falls below an automatic stop permission vehicle speed due to a decrease in vehicle speed after experiencing traveling exceeding a threshold value is known (for example, Patent Literature 1).
- the present invention has been made paying attention to the above problems, and an object of the present invention is to provide a vehicle engine stop control device that improves the practical fuel consumption by ensuring the operation frequency of coast stop control in a traffic road traveling scene.
- the present invention includes a restartable engine in a drive source.
- the vehicle engine stop control device includes coast stop control means for automatically stopping the engine when the vehicle speed falls below the automatic stop permission vehicle speed due to a decrease in the vehicle speed after experiencing traveling exceeding the first threshold.
- the coast stop control means has a vehicle speed threshold value setting unit for setting a second threshold value that is lower than the first threshold value, and after the start from the automatic engine stop by the coast stop control, the vehicle speed does not exceed the first threshold value. If the vehicle experiences traveling exceeding the second threshold during traveling, the automatic engine stop by the coast stop control is permitted at least once.
- coast stop control the engine is automatically stopped when the vehicle speed falls below the automatic stop permission vehicle speed due to a decrease in the vehicle speed after experiencing traveling exceeding the first threshold. For this reason, although the engine is automatically stopped in the scene where the vehicle first decelerates and stops even after entering a traffic jam road, the engine automatic stop does not operate unless the vehicle experiences traveling at a vehicle speed exceeding the first threshold after the next start. On the other hand, even in a congested road traveling scene where the vehicle speed does not exceed the first threshold, if the vehicle experiences a travel exceeding the second threshold that is lower than the first threshold, the engine is automatically operated by coast stop control at least once. Stop is allowed. As a result, it is possible to improve the practical fuel consumption by ensuring the operation frequency of the coast stop control in the traffic road traveling scene.
- FIG. 1 is an overall system diagram showing an engine vehicle to which an engine stop control device of Embodiment 1 is applied. It is a whole flowchart which shows the flow of the coast stop control process performed with the engine controller in the engine stop control apparatus of Example 1.
- FIG. 5 is a flowchart showing a flow of engine automatic stop permission / prohibition determination processing that is a part of the CS permission condition in the coast stop control processing according to the first embodiment. It is a time chart which shows each characteristic of the vehicle speed at the time of the deceleration stop at which coast stop control is performed with the engine vehicle carrying the engine stop control apparatus of Example 1, and an engine speed. Time chart showing characteristics of vehicle speed, engine speed, coast stop permission determination, and engine stop count during low speed driving in a traffic jam road scene where coast stop control is performed in an engine vehicle equipped with the engine stop control device of the first embodiment FIG.
- the configuration of the vehicle engine stop control device according to the first embodiment will be described by dividing it into an “overall system configuration” and a “coast stop control processing configuration”.
- FIG. 1 shows an engine vehicle to which the engine stop control device of the first embodiment is applied.
- the overall system configuration will be described below with reference to FIG.
- the drive system of the engine vehicle includes an engine 1, an automatic transmission 2, a propeller shaft 3, a differential 4, left and right drive shafts 5L and 5R, and left and right drive wheels 6L and 6R. It is equipped with.
- the engine 1 is provided with a starting motor 7 for starting the engine 1 that is stopped by starting or coast stop control.
- the starter motor 7 uses an in-vehicle 12V battery 8 as a power source.
- the engine vehicle control system includes an engine controller 10, an AT controller 11, and a vehicle electrical component 12. These control system devices can exchange information bidirectionally. They are connected by a line 13.
- the engine controller 10 inputs necessary information from a vehicle speed sensor 14, an accelerator opening sensor 15, an eco mode switch 16, a navigation system 17, other sensors / switches 18, and the like. Then, based on the input information, engine fuel control (fuel cut / fuel recovery), coast stop control (engine automatic stop / engine restart), and the like are performed.
- the eco mode switch 16 inputs information indicating whether or not the vehicle is traveling while the eco driving mode is selected, and the navigation system 17 inputs traffic level information on the travel route of the host vehicle.
- the AT controller 11 performs a shift control of the automatic transmission 2 according to an operating point determined by the vehicle speed VSP and the accelerator opening APO, using a preset shift map.
- FIG. 2 shows a flow of coast stop control processing executed by the engine controller in the engine stop control device of Embodiment 1 (coast stop control means).
- coast stop control means coast stop control means
- step S1 it is determined whether a CS permission condition for permitting coast stop control is satisfied. If YES (CS permission condition is satisfied), the process proceeds to step S2. If NO (CS permission condition is not satisfied), the process proceeds to the end.
- the vehicle speed VSP experiences a travel exceeding the second threshold value, and then the vehicle speed VSP starts CS. This is when the vehicle speed is less than or equal to the vehicle speed and the CS count is less than the permitted count.
- step S2 following the determination that the CS permission condition is satisfied in step S1, the engine 1 is automatically stopped by a fuel cut, and the process proceeds to step S3.
- step S3 following the engine automatic stop in step S2, it is determined whether or not a CS restart condition for stopping the coast stop control and restarting the engine 1 is satisfied. If YES (CS restart condition is satisfied), the process proceeds to step S5. If NO (CS restart condition is not satisfied), the process proceeds to step S4.
- the establishment of the CS restart condition refers to a brake foot release operation, an accelerator depression start operation, a selection operation to the travel range, or the like that represents the driver's intention to start from the stop.
- step S4 following the determination that the CS restart condition is not satisfied in step S3, the engine 1 is stopped and the process proceeds to the end.
- step S5 following the establishment of the CS restart condition in step S3, the starting motor 7 is driven to restart the engine 1, and the process proceeds to the end.
- FIG. 3 shows a flow of the engine automatic stop permission / prohibition determination process which is a part of the CS permission condition in the coast stop control process of the first embodiment (coast stop control means).
- each step of FIG. 3 representing the engine automatic stop permission / prohibition determination processing configuration will be described.
- a first threshold value and a second threshold value which are vehicle speed threshold values, are set, and the process proceeds to step S11.
- the first threshold value is set to a vehicle speed value (for example, about 20 to 30 km / h) that does not reach during a traffic jam that repeats starting / stopping.
- the second threshold value is lower than the first threshold value and higher than the CS start vehicle speed, and the vehicle speed value (eg, 10 ⁇ 15km / h).
- the second threshold value is obtained by inputting eco-travel mode selection information from the eco-mode switch 16 and lowering the vehicle speed value when the eco-drive mode is selected compared to when the eco-drive mode is not selected. Value is set.
- step S11 following the setting of the vehicle speed threshold value in step S10, it is determined whether or not the vehicle speed VSP exceeds the first threshold value. If YES (VSP> first threshold), the process proceeds to step S12. If NO (VSP ⁇ first threshold), the process proceeds to step S15.
- the CS start vehicle speed is set to a vehicle speed value (for example, a vehicle speed of about 8 km / h or less) that is just before stopping and that does not cause a problem even if the engine 1 is automatically stopped.
- step S14 following the determination in step S13 that VSP ⁇ CS start vehicle speed, the automatic engine stop is permitted and the process proceeds to the end.
- step S15 following the determination that VSP ⁇ the first threshold value in step S11, it is determined whether or not the vehicle speed VSP exceeds the second threshold value. If YES (VSP> second threshold), the process proceeds to step S17. If NO (VSP ⁇ second threshold), the process proceeds to step S16.
- step S16 following the determination that VSP ⁇ the second threshold value in step S15, the engine automatic stop is prohibited and the process proceeds to the end.
- step S17 following the determination that VSP> second threshold value in step S15 or the determination that VSP> CS start vehicle speed in step S18, whether vehicle speed VSP exceeds the first threshold value or not. Judging. If YES (VSP> first threshold), the process proceeds to step S12. If NO (VSP ⁇ first threshold), the process proceeds to step S18.
- the same value as the CS start vehicle speed in step S13 is used as the CS start vehicle speed.
- step S19 following the determination that VSP ⁇ CS start vehicle speed in step S18, it is determined whether or not the CS number, which is the number of coast stop control operations, is equal to or less than the permitted number. If YES (CS number ⁇ permitted number), the process proceeds to step S20. If NO (CS number> permitted number), the process proceeds to step S22.
- step S20 following the determination that CS number ⁇ permitted number in step S19, automatic engine stop is permitted, and the process proceeds to step S21.
- step S21 following the engine automatic stop permission in step S20, the CS count which is the number of coast stop control operations is counted up, and the process proceeds to the end.
- step S22 following the determination that CS number> permitted number in step S19, the engine automatic stop is prohibited and the process proceeds to the end.
- time t1 is accelerator OFF / brake ON / fuel cut time
- time t2 is fuel cut recovery & lockup release time
- time t3 coast stop control start time
- time t4 is vehicle stop time
- time t5 is idle stop. Control start time.
- coast stop control when the vehicle speed drops to the CS start vehicle speed at time t3, engine automatic stop control by fuel cut is started.
- the engine automatic stop control by the fuel cut is started at the time t5 when the control start condition is satisfied after the vehicle stop time t4.
- the timing at which the engine automatic stop control by the fuel cut is started is earlier than in the idle stop control, and the fuel efficiency effect by the idle stop control is expanded. That is, the fuel reduction allowance from time t3 to time t5 by the coast stop control is an increase in the fuel efficiency effect.
- step S2 the process proceeds from step S1 to step S2 in the flowchart of FIG. .
- step S2 the engine 1 is automatically stopped by the fuel cut.
- step S3 it is determined whether or not the CS restart condition is satisfied, and while it is determined that the CS restart condition is not satisfied, in the flowchart of FIG.
- the flow from S1 ⁇ step S2 ⁇ step S3 ⁇ step S4 is repeated, and in step S4, the engine 1 is continuously stopped.
- step S3 when it is determined in step S3 that the CS restart condition is satisfied by performing a brake release operation, an accelerator depressing start operation, a selection operation to the travel range, or the like that indicates the driver's intention to start, step S3 to step S5 Proceed to In step S5, the starting motor 7 is driven to restart the engine 1.
- the engine 1 is continuously stopped until the CS restart condition is satisfied after the CS permission condition is satisfied.
- step S10 If the vehicle experiences a travel in which the vehicle speed VSP exceeds the first threshold after starting, the process proceeds from step S10 to step S11 to step S12 to step S13 in the flowchart of FIG. That is, if it is determined in step S11 that the vehicle speed VSP exceeds the first threshold value, the CS count is cleared in step S12, and in step S13, it is determined whether the vehicle speed VSP is equal to or lower than the CS start vehicle speed. To be judged. If the vehicle speed VSP is determined to be equal to or less than the CS start vehicle speed in step S13, the process proceeds from step S14 to the end. In step S14, automatic engine stop is permitted, and coast stop control is performed. Operates.
- step S10 After experiencing the engine automatic stop by the operation of the coast stop control, while the vehicle speed VSP is equal to or lower than the second threshold value, in the flowchart of FIG. 3, the flow proceeds from step S10 ⁇ step S11 ⁇ step S15 ⁇ step S16 ⁇ end. Repeated. In step S16, the engine automatic stop is prohibited. Thereafter, when the vehicle speed VSP exceeds the second threshold value, the process proceeds from step S15 to step S17 to step S18, and the process of proceeding to step S17 ⁇ step S18 is repeated until it is determined that VSP ⁇ CS start vehicle speed. It is. In step S18, it is determined whether or not the vehicle speed VSP has become the CS start vehicle speed or less while maintaining the first threshold value or less.
- step S15 After experiencing the vehicle speed VSP exceeding the second threshold value in step S15, for example, if the vehicle speed VSP is determined to have exceeded the first threshold value in step S17, the process proceeds from step S17 to step S12. Return to coast stop control during deceleration stop in normal driving.
- step S18 If the vehicle is traveling on a congested road and the vehicle speed VSP has exceeded the second threshold but does not exceed the first threshold, it is determined in step S18 that VSP ⁇ CS start vehicle speed, the process proceeds from step S18 to step S19.
- step S19 it is determined whether or not the CS count, which is the number of coast stop control operations, is equal to or less than the permitted count. If CS number ⁇ permitted number, the process proceeds to step S20, and automatic engine stop is permitted. In the next step S21, the CS number, which is the number of coast stop control operations, is counted up, and the process proceeds to the end.
- step S19 if the coast stop control operation count exceeds the permitted count and it is determined in step S19 that the CS count> the permitted count, the process proceeds from step S19 to step S22 ⁇ end, and in step S22, the engine automatic stop is prohibited.
- the engine automatic stop permission is not issued unless the vehicle speed VSP exceeds the first threshold value. However, as an exception, the vehicle speed VSP does not exceed the first threshold value but the second threshold value is set. If the experience is exceeded, automatic engine stop is allowed.
- the number of times that the engine automatic stop is permitted as an exception depends on the setting of the number of permitted times, but the engine automatic stop is permitted at least once.
- the vehicle speed VSP experiences a travel exceeding the first threshold and then the vehicle is decelerated at time t0 due to entering a congested road, the vehicle speed VSP starts decreasing from time t0.
- the vehicle speed VSP becomes equal to or lower than the CS start vehicle speed at the vehicle speed point A at time t1, automatic engine stop is permitted, and the engine 1 is automatically stopped from time t1 to time t2.
- the vehicle speed VSP does not exceed the first threshold because it is a traffic jam traveling scene, but the vehicle speed VSP exceeds the second threshold at the vehicle speed point B at time t3 (first time).
- the vehicle speed VSP becomes equal to or lower than the CS start vehicle speed at the vehicle speed point C at time t4
- engine automatic stop is permitted, and the engine 1 is automatically stopped from time t4 to time t5. From time t4, the number of engine stops during low-speed running is rewritten to 1.
- the vehicle speed VSP does not exceed the first threshold because it is a traffic road traveling scene, but the vehicle speed VSP exceeds the second threshold at the vehicle speed point D at time t6 (second time). Even when the vehicle speed VSP becomes equal to or lower than the CS start vehicle speed at the vehicle speed point E at time t7, the automatic engine stop is prohibited.
- the reason why the engine automatic stop is prohibited is that the number of times of engine stop during low-speed running is rewritten to 1 from time t4.
- the engine is allowed to stop once. That is, in the coast stop control, after the vehicle speed VSP has traveled beyond the first threshold value, the engine 1 is automatically stopped when the vehicle speed VSP falls below the CS start vehicle speed (time t1 to t2 in FIG. 5). For this reason, the engine 1 is automatically stopped in the scene where it decelerates and stops for the first time even if it enters a congested road. However, after the next start, the engine automatic stop is activated unless the vehicle experiences traveling at a vehicle speed VSP exceeding the first threshold. do not do.
- the engine by coast stop control is performed at least once. Automatic stop is permitted (time t4 to t5 in FIG. 5). As described above, it is possible to improve the practical fuel consumption by ensuring the operation frequency of the coast stop control in the traffic road traveling scene.
- the first threshold value is set to a vehicle speed value that does not reach during traffic jams such as repeated start / stop. That is, if the first threshold value is set to the vehicle speed value on the low speed side, it is possible to ensure the operation frequency of coast stop control, but coast stop control operates more frequently than necessary in a traffic jam scene, and the driver feels uncomfortable. give. On the other hand, by setting the first threshold value to a vehicle speed value that does not reach during traffic jams, it is possible to prevent the coast stop control that gives the driver a sense of incongruity in a traffic jam driving scene from operating more than necessary. it can.
- the second threshold value is a vehicle speed value that is lower than the first threshold value, higher than the CS start vehicle speed, and sometimes experienced during traffic jams such as repeated start / stop.
- the configuration is set. That is, when the second threshold value is set to a vehicle speed value close to the first threshold value, traveling experience with a vehicle speed exceeding the second threshold value in a traffic jam road scene becomes rare. On the other hand, when the second threshold value is set to a vehicle speed value close to the CS start vehicle speed, the frequency of traveling experience due to the vehicle speed exceeding the second threshold value in the traffic road traveling scene becomes too high. On the other hand, by setting the vehicle speed value that sometimes experiences exceeding the second threshold during traffic jams, it is possible to ensure the frequency of coast stop control that is targeted in a traffic jam scene.
- the eco-driving mode selection information is input, and the second threshold value is set to a value obtained by lowering the vehicle speed value when the eco-driving mode is not selected when the eco-driving mode is selected. It was set as the structure to do. That is, when the eco-driving mode is selected, the driver's fuel efficiency request has priority over the uncomfortable feeling given to the driver. Therefore, when the eco-driving mode is selected, the practical fuel efficiency can be improved in response to the driver's request by setting the second threshold value to a lower value.
- traffic congestion information on the traveling road is input, and the number of permitted automatic engine stops by coast stop control is increased as the degree of traffic congestion becomes milder. That is, in the case of a severely congested road running scene, if the distance between the vehicles is short and the start / stop across the CS start vehicle speed is frequently repeated, and the number of times of automatic engine stop is increased, the driver feels uncomfortable. On the other hand, in the case of a traffic jam traveling scene where the degree of traffic jam is moderate, the inter-vehicle distance is long and the start / stop time interval across the CS start vehicle speed is also long. Therefore, when the degree of traffic congestion is moderate, the actual fuel consumption can be improved without increasing the driver's uncomfortable feeling by increasing the number of times of automatic engine stop permission.
- the number of times the engine automatic stop is permitted by the coast stop control is increased compared to when the eco-driving mode is not selected. It was. That is, when the eco-driving mode is selected, the driver's fuel efficiency request has priority over the uncomfortable feeling given to the driver. Therefore, when the eco-driving mode is selected, the actual fuel consumption can be improved in response to the driver's request by increasing the number of times the engine automatic stop is permitted.
- a coast stop control means (FIG. 3) is provided for automatically stopping the engine 1 when the vehicle speed VSP exceeds the first threshold and then falls below the automatic stop permission vehicle speed (CS start vehicle speed) due to a decrease in the vehicle speed VSP.
- the coast stop control means (FIG. 3) has a vehicle speed threshold value setting unit (S10) for setting a second threshold value that is lower than the first threshold value, and after the start from the automatic engine stop by the coast stop control, the vehicle speed is During the travel without exceeding the first threshold, if a travel exceeding the second threshold is experienced, the engine automatic stop by the coast stop control is permitted at least once (S20). For this reason, practical fuel consumption can be improved by ensuring the operation frequency of the coast stop control in the traffic road traveling scene.
- the vehicle speed threshold setting unit (S10 in FIG. 3) sets, as the first threshold, a vehicle speed value that does not reach during traffic jams such as repeated start / stop. For this reason, in addition to the effect of (1), it is possible to prevent the coast stop control that gives the driver a sense of incongruity in a traffic road traveling scene from operating more than necessary.
- the vehicle speed threshold value setting unit (S10 in FIG. 3) repeats start / stop as the second threshold value, which is lower than the first threshold value and higher than the automatic stop permission vehicle speed (CS start vehicle speed). Set to a vehicle speed value that may be experienced during traffic jams. For this reason, in addition to the effect of (2), it is possible to secure the operation frequency of coast stop control targeted in a traffic road traveling scene.
- the vehicle speed threshold value setting unit (S10 in FIG. 3) inputs the selection information of the eco travel mode, and when the eco travel mode is selected as the second threshold, when the eco travel mode is not selected.
- the vehicle speed value is set to a value lower than that. Therefore, in addition to the effect of (3), when the eco-driving mode is selected, the practical fuel consumption can be improved in response to the driver's request by setting the second threshold value to a lower value.
- the coast stop control means (FIG. 3) inputs the traffic congestion information of the traveling road, and increases the number of times of automatic engine stop permission by coast stop control as the degree of traffic congestion becomes milder (S19). For this reason, in addition to the effects of (1) to (4), when the degree of congestion is moderate, increasing the number of times the engine is automatically stopped can improve the practical fuel consumption without giving the driver a sense of incongruity. .
- the coast stop control means (Fig. 3) inputs the selection information of the eco-driving mode, and when the eco-driving mode is selected, the engine by the coast stop control is compared to when the eco-driving mode is not selected.
- the number of times of automatic stop is increased (S19). Therefore, in addition to the effects (1) to (5), when the eco-driving mode is selected, the actual fuel consumption can be improved in response to the driver's request by increasing the number of permitted automatic engine stops.
- the vehicle engine stop control device of the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the invention according to each claim of the claims. Design changes and additions are permitted without departing from the gist of the present invention.
- the first threshold is set to a vehicle speed value that does not reach during traffic jams such as repeated start / stop.
- the second threshold value is set to a vehicle speed value that is lower than the first threshold value, higher than the CS start vehicle speed, and may exceed the experience during traffic jams such as repeated start / stop.
- the vehicle speed threshold value setting unit may be an example in which both the first threshold value and the second threshold value are given as fixed values.
- the first threshold value and the second threshold value may be given as variable values, and the threshold value may be changed according to driving environment information, driver operation personality information, etc. in addition to the eco driving mode selection information.
- coast stop control means after traveling from the engine automatic stop by coast stop control and traveling without exceeding the first threshold, when traveling exceeding the second threshold, Therefore, automatic engine stop by coast stop control is permitted only once. And when the degree of traffic congestion is moderate or when the eco-driving mode is selected, an example of increasing the number of times of permission is shown.
- the coast stop control means may be an example in which a predetermined fixed number of permitted times is used.
- working scene judged including information other than traffic congestion degree information or eco-driving mode selection information may be sufficient.
- Example 1 shows an example in which the engine stop control device of the present invention is applied to an engine vehicle.
- the engine stop control device of the present invention can also be applied to a hybrid vehicle having an engine as a drive source.
- the present invention can be applied to any vehicle provided with a restartable engine as a drive source.
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Abstract
Description
この車両のエンジン停止制御装置において、車速が第1閾値を超える走行を経験した後、車速の低下により自動停止許可車速以下になるとエンジンを自動停止するコーストストップ制御手段を設ける。
コーストストップ制御手段は、第1閾値より低速である第2閾値を設定する車速閾値設定部を有し、コーストストップ制御によるエンジン自動停止からの発進後であって車速が第1閾値を超えないままでの走行中、前記第2閾値を超える走行を経験すると、少なくとも1回はコーストストップ制御によるエンジン自動停止を許可する。
この結果、渋滞路走行シーンにおいてコーストストップ制御の作動頻度を確保することで、実用燃費の向上を図ることができる。
実施例1における車両のエンジン停止制御装置の構成を、「全体システム構成」、「コーストストップ制御処理構成」に分けて説明する。
図1は、実施例1のエンジン停止制御装置が適用されたエンジン車を示す。以下、図1に基づき、全体システム構成を説明する。
図2は、実施例1のエンジン停止制御装置におけるエンジンコントローラにて実行されるコーストストップ制御処理の流れを示す(コーストストップ制御手段)。以下、コーストストップ制御処理構成をあらわす図2の各ステップについて説明する。なお、「CS」は、コーストストップ制御の略称である。
ここで、CS許可条件が成立するとは、少なくとも図3のフローチャートにおいてエンジン自動停止が許可されたときをいう。つまり、車速VSPが第1閾値を超える走行を経験した後、減速して車速VSPがCS開始車速(=自動停止許可車速)以下になったときである。これ以外に、エンジン自動停止が作動した後であって、車速VSPが第1閾値を超えることのない走行中に、車速VSPが第2閾値を超える走行を経験し、その後、車速VSPがCS開始車速以下になり、かつ、CS回数が許可回数未満であるときである。
ここで、CS再始動条件の成立とは、停車からのドライバー発進意図をあらわすブレーキ足離し操作やアクセル踏み込み開始操作や走行レンジへのセレクト操作などをいう。
ここで、第1閾値は、発進/停止を繰り返すような渋滞走行中に到達することのない車速値(例えば、20~30km/h程度)に設定される。
また、第2閾値は、第1閾値より低速であり、かつ、CS開始車速よりも高速であり、発進/停止を繰り返すような渋滞走行中に超える経験をすることがある車速値(例えば、10~15km/h程度)に設定される。そして、この第2閾値は、エコモードスイッチ16からエコ走行モードの選択情報を入力し、エコ走行モードを選択しているときは、エコ走行モードを選択していないときに比べて車速値を下げた値に設定される。
ここで、CS開始車速としては、停車直前でありエンジン1を自動停止しても問題のない車速値(例えば、8km/h程度以下の車速)に設定される。
ここで、CS開始車速は、ステップS13でのCS開始車速と同じ値が用いられる。
ここで、許可回数は、基本回数として、許可回数=1(1回のCSを許可し、2回以上のCSを禁止)というように固定値で与えている。そして、ナビゲーションシステム17から走行路の渋滞情報を入力し、渋滞度合いが緩やかなほど許可回数を増やしている。さらに、エコモードスイッチ16からのエコ走行モードの選択情報を入力し、エコ走行モードを選択しているとき、エコ走行モードを選択していないときに比べて許可回数を増やしている。
実施例1のエンジン車のエンジン停止制御装置における作用を、「コーストストップ制御とアイドルストップ制御の対比作用」、「コーストストップ制御処理作用」、「渋滞路走行シーンでのコーストストップ制御作用」、「他の特徴作用」に分けて説明する。
以下、図4に示すタイムチャートに基づき、アクセルOFF/ブレーキON操作での減速停止時におけるコーストストップ制御とアイドルストップ制御の対比作用を説明する。
図4において、時刻t1はアクセルOFF/ブレーキON/燃料カット時刻、時刻t2は燃料カットリカバー&ロックアップ解除時刻、時刻t3はコーストストップ制御開始時刻、時刻t4は車両停止時刻、時刻t5はアイドルストップ制御開始時刻である。
上記のように、アイドルストップ制御による燃費効果をさらに拡大したコーストストップ制御での全体処理作用を、図2に示すフローチャートに基づき説明する。
このように、コーストストップ制御では、CS許可条件が成立してからCS再始動条件が成立するまでの間、エンジン1の停止が継続される。
発進した後、車速VSPが第1閾値を超えた走行を経験すると、図3のフローチャートにおいて、ステップS10→ステップS11→ステップS12→ステップS13へと進む。つまり、ステップS11にて車速VSPが第1閾値を超えていると判断されると、ステップS12では、CS回数カウントがクリアされ、ステップS13では、車速VSPがCS開始車速以下であるか否かが判断される。そして、減速停止走行に移行し、ステップS13にて車速VSPがCS開始車速以下であると判断されると、ステップS14→エンドへと進み、ステップS14では、エンジン自動停止が許可され、コーストストップ制御が作動する。
以下、図5に示すタイムチャートに基づき、渋滞路走行シーンでのコーストストップ制御作用を説明する。
すなわち、コーストストップ制御では、車速VSPが第1閾値を超える走行を経験した後、車速VSPの低下によりCS開始車速以下になるとエンジン1が自動停止される(図5の時刻t1~t2)。このため、渋滞路に入っても最初に減速停止するシーンではエンジン1が自動停止されるが、続いての発進後、第1閾値を超える車速VSPによる走行を経験しない限り、エンジン自動停止は作動しない。
これに対し、車速VSPが第1閾値を超えない走行になる渋滞路走行シーンであっても、第1閾値より低速の第2閾値を超える走行を経験すると、少なくとも1回はコーストストップ制御によるエンジン自動停止が許可される(図5の時刻t4~t5)。
このように、渋滞路走行シーンにおいてコーストストップ制御の作動頻度を確保することで、実用燃費の向上を図ることができる。
実施例1では、第1閾値として、発進/停止を繰り返すような渋滞走行中に到達することのない車速値に設定する構成とした。
すなわち、第1閾値を低速側の車速値とすると、コーストストップ制御の作動頻度を確保することができるが、渋滞路走行シーンでコーストストップ制御が必要以上に高頻度で作動し、ドライバーに違和感を与える。
これに対し、第1閾値を渋滞走行中に到達することのない車速値に設定することで、渋滞路走行シーンでドライバーに違和感を与えるコーストストップ制御が必要以上に作動することを抑制することができる。
すなわち、第2閾値を第1閾値に近い車速値に設定すると、渋滞路走行シーンにおいて第2閾値を超える車速による走行経験が稀になる。一方、第2閾値をCS開始車速に近い車速値に設定すると、渋滞路走行シーンにおいて第2閾値を超える車速による走行経験の頻度が多くなり過ぎる。
これに対し、第2閾値を渋滞走行中に超える経験をすることがある車速値に設定することで、渋滞路走行シーンにおいて狙いとするコーストストップ制御の作動頻度を確保することができる。
すなわち、エコ走行モードの選択するときは、ドライバーに与える違和感よりも、ドライバーの燃費要求が優先する。
したがって、エコ走行モードの選択時、第2閾値を下げた値に設定することで、ドライバー要求に応えて実用燃費の向上を図ることができる。
すなわち、激しい渋滞路走行シーンの場合、車間距離が短くてCS開始車速を横切る発進/停止を頻繁に繰り返し、エンジン自動停止の許可回数を増やすと、ドライバーに違和感を与える。
これに対し、渋滞度合いが緩やかな渋滞路走行シーンの場合、車間距離が長く、CS開始車速を横切る発進/停止の時間間隔も長くなる。
したがって、渋滞度合いが緩やかなとき、エンジン自動停止の許可回数を増やすことで、ドライバーに違和感を与えることなく、実用燃費の向上を図ることができる。
すなわち、エコ走行モードの選択するときは、ドライバーに与える違和感よりも、ドライバーの燃費要求が優先する。
したがって、エコ走行モードの選択時、エンジン自動停止の許可回数を増やすことで、ドライバー要求に応えて実用燃費の向上を図ることができる。
実施例1のエンジン車のエンジン停止制御装置にあっては、下記に列挙する効果を得ることができる。
車速VSPが第1閾値を超える走行を経験した後、車速VSPの低下により自動停止許可車速(CS開始車速)以下になるとエンジン1を自動停止するコーストストップ制御手段(図3)を設け、
コーストストップ制御手段(図3)は、第1閾値より低速である第2閾値を設定する車速閾値設定部(S10)を有し、コーストストップ制御によるエンジン自動停止からの発進後であって車速が第1閾値を超えないままでの走行中、第2閾値を超える走行を経験すると、少なくとも1回はコーストストップ制御によるエンジン自動停止を許可する(S20)。
このため、渋滞路走行シーンにおいてコーストストップ制御の作動頻度を確保することで、実用燃費の向上を図ることができる。
このため、(1)の効果に加え、渋滞路走行シーンでドライバーに違和感を与えるコーストストップ制御が必要以上に作動することを抑制することができる。
このため、(2)の効果に加え、渋滞路走行シーンにおいて狙いとするコーストストップ制御の作動頻度を確保することができる。
このため、(3)の効果に加え、エコ走行モードの選択時、第2閾値を下げた値に設定することで、ドライバー要求に応えて実用燃費の向上を図ることができる。
このため、(1)~(4)の効果に加え、渋滞度合いが緩やかなとき、エンジン自動停止の許可回数を増やすことで、ドライバーに違和感を与えることなく、実用燃費の向上を図ることができる。
このため、(1)~(5)の効果に加え、エコ走行モードの選択時、エンジン自動停止の許可回数を増やすことで、ドライバー要求に応えて実用燃費の向上を図ることができる。
Claims (6)
- 駆動源に再始動が可能なエンジンを備えた車両のエンジン停止制御装置において、
車速が第1閾値を超える走行を経験した後、車速の低下により自動停止許可車速以下になると前記エンジンを自動停止するコーストストップ制御手段を設け、
前記コーストストップ制御手段は、前記第1閾値より低速である第2閾値を設定する車速閾値設定部を有し、コーストストップ制御によるエンジン自動停止からの発進後であって車速が第1閾値を超えないままでの走行中、前記第2閾値を超える走行を経験すると、少なくとも1回はコーストストップ制御によるエンジン自動停止を許可する
ことを特徴とする車両のエンジン停止制御装置。 - 請求項1に記載された車両のエンジン停止制御装置において、
前記車速閾値設定部は、前記第1閾値として、発進/停止を繰り返すような渋滞走行中に到達することのない車速値に設定する
ことを特徴とする車両のエンジン停止制御装置。 - 請求項2に記載された車両のエンジン停止制御装置において、
前記車速閾値設定部は、前記第2閾値として、前記第1閾値より低速であり、かつ、前記自動停止許可車速よりも高速であり、発進/停止を繰り返すような渋滞走行中に超える経験をすることがある車速値に設定する
ことを特徴とする車両のエンジン停止制御装置。 - 請求項3に記載された車両のエンジン停止制御装置において、
前記車速閾値設定部は、エコ走行モードの選択情報を入力し、前記第2閾値として、エコ走行モードを選択しているとき、エコ走行モードを選択していないときに比べて車速値を下げた値に設定する
ことを特徴とする車両のエンジン停止制御装置。 - 請求項1から請求項4までの何れか一項に記載された車両のエンジン停止制御装置において、
前記コーストストップ制御手段は、走行路の渋滞情報を入力し、渋滞度合いが緩やかなほどコーストストップ制御によるエンジン自動停止の許可回数を増やす
ことを特徴とする車両のエンジン停止制御装置。 - 請求項1から請求項5までの何れか一項に記載された車両のエンジン停止制御装置において、
前記コーストストップ制御手段は、エコ走行モードの選択情報を入力し、エコ走行モードを選択しているとき、エコ走行モードを選択していないときに比べ、コーストストップ制御によるエンジン自動停止の許可回数を増やす
ことを特徴とする車両のエンジン停止制御装置。
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2014
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- 2014-09-02 CN CN201480081678.5A patent/CN106795819B/zh not_active Expired - Fee Related
- 2014-09-02 WO PCT/JP2014/073052 patent/WO2016035138A1/ja not_active Ceased
- 2014-09-02 US US15/507,270 patent/US10065646B2/en active Active
- 2014-09-02 EP EP14901092.8A patent/EP3190283B1/en not_active Not-in-force
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003035174A (ja) * | 2001-07-23 | 2003-02-07 | Toyota Motor Corp | 車両用内燃機関自動始動制御方法及び装置 |
| JP2012067716A (ja) * | 2010-09-27 | 2012-04-05 | Denso Corp | エンジン制御装置 |
| JP2014196677A (ja) * | 2013-03-29 | 2014-10-16 | 三菱自動車工業株式会社 | エンジン制御装置 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108501952A (zh) * | 2017-02-17 | 2018-09-07 | 福特全球技术公司 | 用于改变启停事件的系统和方法 |
| JP2020007973A (ja) * | 2018-07-09 | 2020-01-16 | ジヤトコ株式会社 | 車両の制御装置及び車両の制御方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6187701B2 (ja) | 2017-08-30 |
| CN106795819B (zh) | 2018-10-12 |
| EP3190283A4 (en) | 2017-10-18 |
| EP3190283A1 (en) | 2017-07-12 |
| US20170291606A1 (en) | 2017-10-12 |
| JPWO2016035138A1 (ja) | 2017-04-27 |
| EP3190283B1 (en) | 2019-07-24 |
| CN106795819A (zh) | 2017-05-31 |
| US10065646B2 (en) | 2018-09-04 |
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