WO2010064645A1 - 省燃費運転システム - Google Patents
省燃費運転システム Download PDFInfo
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- WO2010064645A1 WO2010064645A1 PCT/JP2009/070218 JP2009070218W WO2010064645A1 WO 2010064645 A1 WO2010064645 A1 WO 2010064645A1 JP 2009070218 W JP2009070218 W JP 2009070218W WO 2010064645 A1 WO2010064645 A1 WO 2010064645A1
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- Prior art keywords
- vehicle
- downhill
- fuel
- speed
- vehicle speed
- Prior art date
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- 239000000446 fuel Substances 0.000 claims abstract description 56
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/16—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger operated by remote control, i.e. initiating means not mounted on vehicle
- B60T7/18—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger operated by remote control, i.e. initiating means not mounted on vehicle operated by wayside apparatus
-
- 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
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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
- 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
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/04—Hill descent control
-
- 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
- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/20—Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
-
- 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
- B60W2556/00—Input parameters relating to data
- B60W2556/45—External transmission of data to or from the vehicle
- B60W2556/50—External transmission of data to or from the vehicle of positioning data, e.g. GPS [Global Positioning System] data
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/10—Road Vehicles
- B60Y2200/14—Trucks; Load vehicles, Busses
-
- 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
- F02D41/045—Detection of accelerating or decelerating state
-
- 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
-
- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
Definitions
- the present invention relates to an automatic control system for fuel-saving driving of an automobile, and more particularly to an automatic control capable of reducing fuel consumption when moving downhill.
- Patent Document 1 a fuel-saving system that effectively promotes fuel-saving driving using road gradient information and a control method thereof are disclosed (for example, see Patent Document 1).
- Patent Document 1 the acceleration energy on the downhill is used, specifically, the fuel consumption is improved by performing the deceleration control before the downhill.
- Patent Document 1 the fuel cut advice position before the downhill (position where advice is given to the driver) or the fuel cut control position in the automatic fuel-saving driving system (fuel cut by automatic control).
- the position of the vehicle is determined by the vehicle speed, the slope before the downhill, and the slope of the downhill.
- the gradient before the downhill and the gradient of the downhill are determined by a three-dimensional map. Therefore, in order to decelerate to the target vehicle speed at the start of the downhill, it is necessary to precisely map the slope before the downhill and the slope of the downhill, and the fuel cut advice position or the automatic fuel-saving driving system It was also necessary to map the fuel cut control position in the map precisely.
- the gradient at the actual travel position is not necessarily constant.
- the deceleration at the time of fuel cut varies greatly between empty and loaded vehicles. It was difficult to decelerate to the required vehicle speed (target vehicle speed).
- the fuel is automatically injected so that the vehicle speed is not reduced excessively.
- fuel is injected just before entering a downhill. In such a case, there is a problem that the vehicle behavior becomes jerky and the driver feels uncomfortable. At the same time, there is a problem that the fuel efficiency is adversely affected.
- FIG. 5 shows the travel distance, the vehicle speed, and the fuel injection amount in the control at the time of moving downhill during the automatic fuel-saving driving according to the conventional technology.
- reference symbol P1 indicates a control start position
- reference symbol P2 indicates a peak point (downhill start point) that moves from an uphill to a downhill
- reference symbol Vd indicates a required vehicle speed
- reference symbol Va indicates an actual vehicle speed
- Vt indicates the target vehicle speed when entering the downhill
- symbol q indicates the fuel injection amount.
- the distance from the control start point to the descent start point is, for example, 300 m (constant).
- the symbol ⁇ v indicates the difference between the actual vehicle speed Va and the target vehicle speed Vd.
- FIG. 5 shows a case where the slope on the uphill side is steeper than the data stored in the database, or the vehicle mass is small.
- the vehicle stalls before reaching the downhill starting point P2, and the vehicle speed Va is lower than the target vehicle speed Vt when entering the downhill. Therefore, the fuel injection amount q is temporarily injected. Due to this temporary fuel injection q, the vehicle speed Va increases rapidly and becomes higher than the target vehicle speed Vt when entering the downhill, but the fuel is cut immediately after the fuel injection amount q is temporarily injected. Therefore, the vehicle speed Va decreases again. As a result, the driving feeling before and after the downhill starting point P2 becomes jerky, and the fuel consumption deteriorates due to temporary fuel injection.
- FIG. 6 shows the travel distance, the vehicle speed, and the fuel injection amount in the control at the time when the vehicle moves from the uphill to the downhill during the automatic fuel-saving driving of the prior art, as in FIG.
- FIG. 6 shows a case where the actual slope on the uphill side is gentler or the vehicle mass is larger than the data stored in the database.
- the actual vehicle speed Va does not decrease
- the actual vehicle speed Va at the descending slope start point P2 exceeds the target vehicle speed Vt when entering the descending slope
- the frequency of the auxiliary brake being activated during the descending slope increases. .
- FIG. 7 shows a case where the control start position P1 is brought close to the downhill start point P2 and the distance from the control start point to the down start point is set short in order to solve the problem in FIG.
- the actual vehicle speed Va at the downhill starting point P2 exceeds the target vehicle speed Vt at the time of entering the downhill, and the frequency of operation of the auxiliary brake increases during the downhill. The problem still remains.
- JP 2007-156704 A JP 2007-156704 A
- the present invention has been proposed in view of the above-described problems of the prior art, and linearly gradually reduces the target vehicle speed from the start of control to the downhill start point without repeating fuel cut and injection.
- An object of the present invention is to provide a fuel-saving driving system that can achieve a smooth driving feeling while saving fuel consumption.
- the fuel-saving driving system (100) of the present invention includes a vehicle position specifying device (2: GPS, for example) that specifies the position of a vehicle, and a storage device (for example, a database) that stores downhill data existing in the vehicle traveling direction. 11), a vehicle speed measuring device (vehicle speed sensor 3) for measuring the speed (vehicle speed Va) of the vehicle (1), and a control device (fuel-saving driving system side control device: control unit 10). (10) is the target of the vehicle (1) from the vehicle speed (Va) and the downhill data (for example, the distance L from the current position to the downhill start point, the target vehicle speed Vt at the downhill start point, etc.). It has a function of determining (calculating) a speed (required vehicle speed Vd) (claim 1).
- the control device fuel-saving driving system side control device: control unit 10) includes the vehicle speed (Va) at the location where the vehicle (1) is traveling and the distance (L) to the starting point of the downhill From the above, the vehicle (1) is set so that the speed (Va) of the vehicle (1) when the vehicle (1) reaches the downhill start point (P2) becomes the target speed (Vt) at the downhill start point. It is preferable to have a function of calculating a target speed (Vd) at the place where the vehicle is traveling (claim 2).
- control device determines that the speed (Va) of the vehicle at the time when the vehicle (1) reaches the downhill start point (P2) at the downhill start point P2. It has a function of controlling the target speed (Vd) where the vehicle (1) is traveling to gradually decrease (so that the deceleration characteristic becomes linear) so that the target speed (Vt) is reached. (Claim 3).
- the control device (fuel-saving driving system side control device: control unit 10) transmits a control signal to the vehicle side control device (engine controller 4) that controls the engine via the vehicle information network (5).
- the control device (4) has a function of causing the fuel injection device to transmit a control signal for spraying an injection amount of fuel corresponding to the control signal (claim 4).
- the vehicle speed (Va), downhill data for example, the distance L from the current position to the downhill start point, the target vehicle speed Vt at the downhill start point, etc.
- the vehicle target speed (required vehicle speed Vd) is determined (calculated) from the vehicle speed, so that the target speed (Vd) at the location where the vehicle (1) is traveling is linearly decelerated (Claim 2). Since the target speed (Vd) where the vehicle (1) is traveling can be linearly (gradually) decelerated (Claim 3), the downhill starting point It is suppressed that the fuel cut and the fuel injection are repeated before P2.
- the traveling speed (Va) of the vehicle can be reduced.
- the starting point (P1) to be decelerated can be set at a position separated from the downhill starting point (P2) as compared with the prior art.
- the fuel-saving driving system 100 includes a vehicle 1, a GPS 2 that is a vehicle position specifying device, a vehicle speed sensor 3, an engine controller 4, an in-vehicle communication network 5, and a control unit 10 that is a control unit of the automatic fuel-saving driving system.
- the position of the vehicle is specified using the Global Positioning System
- the GPS 2 that is the vehicle position specifying device receives position information from the satellite of the Global Positioning System.
- the in-vehicle communication network 5 connects the control unit 10 to the vehicle speed sensor 3 and the engine controller 4.
- FIG. 2 shows the configuration of the control unit 10.
- the control unit 10 includes a database 11, a current position specifying unit 12, a distance calculating unit (distance calculating unit) 13, a target speed determining unit 14, and a command signal transmission timing determining unit. 15 and an interface 16.
- Information on the current position of the vehicle from the GPS 2 is input to the current position specifying unit 12 via the line L1.
- the database 11 stores the requested vehicle speed (target vehicle speed) at the starting point of the downhill and map data obtained by information from the GPS so far.
- the new map data is sent from the GPS 2 to the database 11 via the line L2, for example.
- the distance calculation unit 13 uses the current position information of the vehicle 1 from the current position specifying unit 12 obtained via the line L3 and the map information obtained from the database 11 via the line L4 to determine the vehicle 1 (current position). Is configured to have a function of calculating a distance “L” (see FIG. 3) from the start point to the downhill starting point.
- a distance L from the current position calculated by the distance calculation unit 13 to the downhill start point is input to the target speed determination unit 14 via a line L5. Further, the current vehicle speed Va measured by the vehicle speed sensor 3 is input to the target speed determination unit 14 via the in-vehicle communication network 5. Further, the requested vehicle speed (target vehicle speed when entering a downhill) Vt stored in the database 11 at the downhill start point is input to the target speed determination unit 14 via the line L6. The target speed determination unit 14 calculates a required vehicle speed (target vehicle speed) Vd based on the distance L from the current position to the downhill start point, the current vehicle speed Va, and the downhill intrusion target vehicle speed Vt. have.
- the command signal transmission timing determination unit 15 has a function of determining a timing for transmitting a control signal for achieving the target vehicle speed Vd.
- the command signal transmission timing determination unit 15 sends a control signal (control signal for achieving the target vehicle speed Vd) to the command signal transmission timing.
- the transmission is made to the engine controller 4 via the line L 8, the interface 16, and the in-vehicle communication network 5.
- the engine controller 4 transmits a control signal to a fuel injection device (not shown), and adjusts or controls the fuel injection amount and the injection timing so that the vehicle speed becomes the target vehicle speed Vd.
- the timer 17 measures the control interval.
- the control unit 10 calculates the distance “L” from the current position of the vehicle to the downhill start point and the target vehicle speed (required vehicle speed: Vd) at predetermined control intervals measured by the timer 17.
- the uphill side of the point (according to the map information stored in the database) Based on the slope and the slope on the downhill side and the vehicle speed at the start of control (300 m before the downhill start point), and the vehicle 1 speed (required vehicle speed) so that it can travel uphill to the downhill start point. ) And adjusted the fuel injection amount.
- the fuel stalls before the downhill start point P2 due to the difference between the gradient information in the database and the actual gradient, or the vehicle mass, and the fuel
- the injection amount is temporarily injected (FIG. 5), or when the actual vehicle speed at the downhill start point P2 exceeds the target vehicle speed when entering the downhill and the auxiliary brake is operated (FIGS. 6 and 7). Were present. Therefore, the purpose of improving fuel consumption may not be achieved.
- the actual vehicle speed Va from the vehicle speed sensor 3, the target vehicle speed Vt when entering the downhill, and the distance L from the current position to the downhill start point are set. Based on this, the speed (required vehicle speed) of the vehicle 1 is determined and the fuel injection amount is adjusted. Further, in the fuel-saving driving system 100 according to the illustrated embodiment, the vehicle is decelerated linearly (gradually) so as to reach the target vehicle speed Vt at the downhill start point P2A, and therefore, at a stage before reaching the downhill start point P2A. It is possible to prevent a situation (see FIG. 5) that the vehicle speed Va falls below the target vehicle speed Vt when entering the downhill.
- the distance that the vehicle 1 travels by decelerating (the distance L from the point P1 where deceleration starts to the downhill starting point P2A) is made longer than that in the related art. Therefore, the vehicle speed Va is not sufficiently decelerated before reaching the downhill starting point P2A, and the vehicle speed Va greatly exceeds the target vehicle speed Vt when entering the downhill at the downhill starting point P2A (FIG. 6, FIG. 7) can be prevented.
- the distance L to the downhill start point P2A since the distance L to the downhill start point P2A is taken into consideration, it is determined whether or not the vehicle speed Va at the current position is appropriate for reaching the target vehicle speed Vt when entering the downhill. In consideration of the above, the required vehicle speed Vd of the vehicle 1 can be determined. Therefore, it is possible to reduce the error between the vehicle speed Va at the downhill starting point P2A and the target vehicle speed Vt when entering the downhill.
- the speed at which the vehicle 1 moves from the current position to the downhill starting point P2A in each control cycle is determined up to the downhill starting point P2A. Therefore, the required vehicle speed or the target vehicle speed Vd of the vehicle 1 can be determined with reference to the predicted value. This means that the required vehicle speed or the target vehicle speed Vd of the vehicle 1 can be corrected for each control cycle. Therefore, in the illustrated embodiment, even if the distance from the starting point P1A to the downhill starting point P2A is long, the fuel injection amount is adjusted by correcting the required vehicle speed or the target vehicle speed Vd for each control cycle.
- the error between the target vehicle speed Vd and the actual vehicle speed Va can be reduced, and the error between the vehicle speed Va at the downhill start point P2A and the target vehicle speed Vt when entering the downhill can be reduced.
- the numerical value of the distance L from the starting point P1A to the downhill starting point P2A can be set to 400 m to 500 m, for example.
- the control unit 10 reads vehicle speed data based on information from the vehicle speed sensor 3 (step S1), and reads position information of a downhill starting point P2A (see FIG. 3) of a running slope from the database 11 (step S2).
- the current position of the vehicle 1 is read from the GPS 2 (step S3).
- the order of reading each data that is, the order of steps S1 to S3 is not limited to the above. Also, steps S1 to S3 can be executed simultaneously.
- step S4 based on the positional information (step S2) of the downhill start point P2A of the running slope and the current position of the vehicle 1 (step S3), the distance calculator 13 determines the distance between the downhill start point P2A and the current position. L is calculated.
- step S5 the control unit 10 determines whether or not the distance L between the downhill starting point P2A and the current position is equal to or less than a constant (for example, 400 to 500 m). If the distance L from the current position to the downhill starting point P2A is equal to or less than a constant (YES in step S5), the process proceeds to step S6. On the other hand, if the distance L from the current position to the downhill starting point P2A is larger than the constant (step S5 is NO), step S1 and subsequent steps are repeated.
- a constant for example, 400 to 500 m
- step S6 the required vehicle speed (target vehicle speed) Vd is calculated from parameters such as the vehicle speed Va, the target vehicle speed Vt when entering the downhill, and the distance L from the current position P1 to the downhill start point P2. Then, the process proceeds to step S7.
- step S ⁇ b> 7 a control signal for controlling the fuel injection amount so as to obtain the required vehicle speed Vd is output to the engine controller 4 via the in-vehicle communication network 5. Then, the engine controller 4 transmits a control signal related to the fuel injection amount to achieve a required vehicle speed Vd to a fuel injection device (not shown). Thereafter, step S1 and subsequent steps are repeated.
- the illustrated fuel-saving driving system 100 includes the vehicle speed Va, downhill data (for example, the position of the downhill start point P2A, the target vehicle speed Vt when entering the downhill), and the downhill start point from the current position.
- the target vehicle speed (required vehicle speed Vd) is determined from the distance L to P2A.
- the fuel-saving driving system 100 since the target vehicle speed Vd and the vehicle speed Va at the place where the vehicle 1 is traveling can be controlled as shown in FIG. 3, the fuel cut is performed before the downhill start point P2A. And the frequency of operating the auxiliary brake on the downhill is repeated.
- the fuel-saving driving system 100 shown in the figure Since fuel cut and fuel injection are not repeated, according to the fuel-saving driving system 100 shown in the figure, the vehicle behavior becomes unstable and jerky, and the driver does not feel unstable or uncomfortable. Further, according to the illustrated fuel-saving driving system 100, the frequency of operating the auxiliary brake during the downhill is reduced. This means that the vehicle is sufficiently decelerated up to the downhill starting point P2A, and the fuel-saving operation system 100 shown in the figure means that fuel consumption is saved. That is, according to the illustrated embodiment, fuel-saving driving is achieved.
- the present invention may be applied to, for example, when moving from a flat road to a downhill, in addition to moving from an uphill to a downhill.
- FIG. 6 is a diagram showing travel distance, vehicle speed, and fuel injection characteristics when shifting to a downhill in the prior art different from FIG. 5.
- FIG. 7 is a diagram showing travel distance, vehicle speed, and fuel injection characteristics when shifting from ascending to descending slope in the prior art different from FIGS. 5 and 6.
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- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
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Abstract
Description
係る従来技術(特許文献1)では、下り坂での加速エネルギを利用して、詳細には、下り坂手前で減速制御を行うことにより燃費向上を図っている。
そのため、下り坂の開始時点で目標とする車速に減速するためには、下り坂手前の勾配および下り坂の勾配を精密にマップ化する必要があり、燃料カットのアドバイス位置又は自動省燃費運転システムでの燃料カットの制御位置も精密にマップ化する必要があった。
また、貨物自動車では空車・積車でその質量は大きく異なるため、空車時と積車時とでは燃料カット時の減速度も大きく変わり、空車時と積車時の双方において、下り坂開始時点で要求どおりの車速(目標車速)にまで減速することは困難であった。
ここで、自動省燃費運転モードの場合には、要求車速以下になると、自動的に燃料を噴射して、車速が低下し過ぎないように制御している。係る制御によって、下り坂に入る直前で燃料を噴射してしまう場合があり、その様な場合には車両挙動がギクシャクしたものとなり、ドライバが違和感を持ってしまうという問題がある。それと共に、燃費に対しても悪影響を与えてしまうという問題が存在する。
図5において、符号P1は制御開始位置を示し、符号P2は登坂から降坂に移るピーク地点(下り坂開始点)を示し、符号Vdは要求車速を示し、符号Vaは実車速を示し、符号Vtは下り坂侵入時の目標車速を示し、符号qは燃料噴射量を示している。ここで、制御開始地点から下り開始点までの距離は、例えば300m(定数)である。
図5において、符号δvは、実車速Vaと目標車速Vdとの差を示している。
図5で示す場合には、下り坂開始点P2に至る手前で失速して、下り坂侵入時の目標車速Vtよりも車速Vaが低下している。そのため燃料噴射量qを一時的に噴射している。この一時的な燃料噴射qにより車速Vaは急激に増加し、下り坂侵入時の目標車速Vtよりも高速となるが、燃料噴射量qを一時的に噴射した直後に、燃料をカットしているので、再び車速Vaは減少してしまう。
その結果、下り坂開始点P2前後における運転フィーリングがギクシャクとしたものとなってしまい、そして、一時的な燃料噴射によって燃費の悪化を招いてしまう。
図6で示す場合には、実車速Vaが下がりきらず、下り坂開始点P2における実車速Vaが下り坂侵入時目標車速Vtを上回り、下り坂の途中で補助ブレーキが作動する頻度が多くなるので、燃費は悪化する。
図7では、図5で示す場合のように、下り坂開始点P2に至る手前で燃料噴射量qを一時的に噴射する必要はない。しかし、図6で示す場合と同様に、下り坂開始点P2における実車速Vaが下り坂侵入時目標車速Vtを上回ってしまい、下り坂の途中で補助ブレーキが作動する頻度が多くなるので、燃費が悪化してしまうという問題が依然として残っている。
すなわち、燃料カット或いは燃料噴射を行なうと、車両挙動が不安定となり(ギクシャクして)、車両乗員に不安定感或いは不快感を与えてしまうが、本発明では燃料カットと燃料噴射とを繰り返してしまうことが抑制されるので、車両乗員に対して係る不安定感或いは不快感を与えてしまうことが防止される。
図1において、本発明の実施形態に係る省燃費運転システムは、全体を符号100で示している。
省燃費運転システム100は、車両1、車両位置特定装置であるGPS2、車速センサ3、エンジンコントローラ4、車両内通信ネットワーク5、自動省燃費運転システムの制御手段であるコントロールユニット10を有している。
本実施形態では、Global Positioning Systemを用いて車両の位置を特定しており、車両位置特定装置であるGPS2は、Global Positioning Systemの衛星からの位置情報等を受信している。
車両内通信ネットワーク5は、コントロールユニット10と車速センサ3及びエンジンコントローラ4とを接続している。
図2において、コントロールユニット10は、データベース11、現在位置特定部12、現在位置から下り坂開始点までの距離の演算部(距離演算部)13、目標速度決定部14、指令信号発信タイミング決定部15、インターフェース16を有している。
データベース11には、下り坂開始点における要求車速(目標車速)及びそれまでにGPSからの情報によって得られた地図データが記憶されている。データベース11に記憶されている地図データを更新する場合は、新規の地図データは、例えば、GPS2からラインL2を経由して、データベース11に送られる。
そして目標速度決定部14は、現在位置から下り坂開始点までの距離Lと、現在の車速Vaと、下り坂侵入時目標車速Vtとに基づいて、要求車速(目標車速)Vdを演算する機能を有している。
目標速度決定部14で決定した目標車速VdがラインL7経由で入力されると、指令信号発信タイミング決定部15では、制御信号(目標車速Vdを達成するための制御信号)を、指令信号発信タイミング決定部15で決定されたタイミングに従って、ラインL8、インターフェース16、車両内通信ネットワーク5を介してエンジンコントローラ4に発信する。
そしてエンジンコントローラ4は、図示しない燃料噴射装置に対して制御信号を発信し、車両速度が目標車速Vdになるように、燃料噴射量及び噴射タイミングを調整或いは制御する。
しかし、図5~図7を参照して上述したように、データベースの勾配情報と現実の勾配との差や、車両質量に起因して、下り坂開始点P2よりも手前で失速して、燃料噴射量を一時的に噴射する場合(図5)や、下り坂開始点P2の実車速が下り坂侵入時目標車速よりも上回ってしまい、補助ブレーキを作動する場合(図6、図7)が存在した。
そのため、燃費を改善するという目的が達成できない場合がある。
また、図示の実施形態に係る省燃費運転システム100では、下り坂開始点P2Aにおいて目標車速Vtになる様に線形に(徐々に)減速させるので、下り坂開始点P2Aに到達する以前の段階で車速Vaが下り坂侵入時目標車速Vtを下回ってしまう、という事態(図5参照)を防止することが出来る。
同様に、図示の実施形態に係る省燃費運転システム100では、車両1が減速して走行する距離(減速を開始する地点P1から下り坂開始点P2Aまでの距離L)を従来技術よりも長くすることが出来るので、下り坂開始点P2Aに到達する以前に十分に減速されず、下り坂開始点P2Aにおいて車速Vaが下り坂侵入時目標車速Vtを大幅に上回ってしまう、という事態(図6、図7参照)を防止することができる。
そのため、下り坂開始点P2Aにおける車速Vaと、下り坂侵入時目標車速Vtとの誤差を小さくすることが可能なのである。
従って、図示の実施形態では、制御を開始する地点P1Aから下り坂開始点P2Aまでの距離が長くても、制御サイクル毎に要求車速或いは目標車速Vdを補正して、燃料噴射量を調整するので、目標車速Vdと実車速Vaとの誤差を少なくして、下り坂開始点P2Aにおける車速Vaと下り坂侵入時目標車速Vtとの誤差を小さくすることが出来る。
なお、図示の実施形態では、制御を開始する地点P1Aから下り坂開始点P2Aまでの距離Lの数値として、例えば400m~500mに設定することが可能である。
なお、各データを読み込む順序、すなわちステップS1~S3の順序は、上記に限定されるものではない。また、ステップS1~S3を同時に実行することも出来る。
現在位置から下り坂開始点P2Aまでの距離Lが定数以下であれば(ステップS5がYES)、ステップS6に進む。
一方、現在位置から下り坂開始点P2Aまでの距離Lが定数よりも大きければ(ステップS5がNO)、ステップS1以降を繰り返す。
ステップS7では、要求車速Vdとなる様に燃料噴射量を制御するための制御信号を、車内通信ネットワーク5を介してエンジンコントローラ4に出力する。そしてエンジンコントローラ4は、図示しない燃料噴射装置に対して、要求車速Vdを達成させるべく燃料噴射量に関する制御信号を発信する。
その後、ステップS1以降を繰り返す。
係る省燃費運転システム100によれば、車両1が走行している個所における目標車速Vd及び車速Vaを、図3で示す様に制御することが出来るので、下り坂開始点P2Aの手前において燃料カットと燃料噴射の繰り返し、或いは、下り坂において補助ブレーキを作動させる頻度が少なくなる。
また、図示の省燃費運転システム100によれば、下り坂の途中で補助ブレーキを作動させる頻度が少なくなる。このことは、下り坂開始点P2Aまでに置いて、十分減速されていることを意味しており、図示の省燃費運転システム100では、燃料消費量が節約されていることを意味している。
すなわち、図示の実施形態によれば、省燃費運転が達成される。
なお、本発明は、登坂から下り坂に移る以外に、例えば平坦路から下り坂に移る際にも適用しても良い。
2・・・車両位置特定装置/GPS
3・・・車速計測装置/車速センサ
4・・・車両側制御装置/エンジンコントローラ
5・・・車両の情報ネットワーク
10・・・制御装置/コントロールユニット
11・・・記憶装置/データベース
12・・・現在位置特定部
13・・・現在位置から下り坂開始点までの距離演算部/距離演算部
14・・・目標速度決定部
15・・・指令信号発信タイミング決定部
16・・・インターフェース
17・・・タイマ
Claims (4)
- 車両の位置を特定する車両位置特定装置と、車両進行方向に存在する下り坂のデータを記憶する記憶装置と、車両の速度を計測する車速計測装置と、制御装置とを有し、該制御装置は、車両の速度と、下り坂のデータとから車両の目標速度を決定する機能を有することを特徴とする省燃費運転システム。
- 制御装置は、車両が走行している個所における車両の速度と、下り坂開始点までの距離とから、車両が下り坂開始点に到達した時点における車両の速度が下り坂開始点における目標速度となる様に、車両が走行している個所における目標速度を演算する機能を有している請求項1の省燃費運転システム。
- 制御装置は、車両が下り坂開始点に到達した時点における車両の速度が下り坂開始点における目標速度となる様に、車両が走行している個所における目標速度を徐々に減速させる制御を行なう機能を有している請求項2の省燃費運転システム。
- 前記制御装置は、車両の情報ネットワークを介してエンジンを制御する車両側制御装置に制御信号を送信し、車両側制御装置が当該制御信号に対応する噴射量の燃料を噴霧するための制御信号を燃料噴射装置に対して送信する様にせしめる機能を有する請求項1~3の何れか1項の省燃費運転システム。
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CN2009801486279A CN102239319B (zh) | 2008-12-04 | 2009-12-02 | 省燃料驾驶系统 |
US13/133,035 US8532905B2 (en) | 2008-12-04 | 2009-12-02 | Fuel-efficient driving system |
EP09830411.6A EP2357342B1 (en) | 2008-12-04 | 2009-12-02 | Fuel-efficient driving system |
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EP (1) | EP2357342B1 (ja) |
JP (1) | JP5116647B2 (ja) |
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SE536464C2 (sv) * | 2012-04-02 | 2013-11-26 | Scania Cv Ab | Förfarande och system för justering av börvärden för hastighetsreglering av ett fordon |
SE538376C2 (sv) | 2013-05-23 | 2016-06-07 | Scania Cv Ab | Förfarande och system för styrning av en lågtryckskrets i ett bränslesystem i ett fordon |
CN104340066B (zh) * | 2013-08-02 | 2017-04-19 | 上海汽车集团股份有限公司 | 车辆定速巡航和节油方法 |
DE102014214140A1 (de) * | 2014-07-21 | 2016-01-21 | Zf Friedrichshafen Ag | Verfahren zur vorausschauenden Steuerung einer Geschwindigkeitsregelanlage eines Kraftfahrzeuges |
JP6417995B2 (ja) | 2015-02-09 | 2018-11-07 | 株式会社デンソー | 車速マネジメント装置及び車速マネジメント方法 |
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JP2000306200A (ja) * | 1993-03-17 | 2000-11-02 | Denso Corp | 車両制御装置 |
JP2005132356A (ja) * | 2003-10-30 | 2005-05-26 | Robert Bosch Gmbh | 駆動ユニットの運転方法 |
JP2007156704A (ja) | 2005-12-02 | 2007-06-21 | Nissan Diesel Motor Co Ltd | 省燃費運転システム |
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JP3321666B2 (ja) * | 1998-10-16 | 2002-09-03 | 本田技研工業株式会社 | オートクルーズ制御装置 |
JP2000308200A (ja) * | 1999-04-20 | 2000-11-02 | Nippon Columbia Co Ltd | 音響信号処理回路及び増幅装置 |
FR2813397B1 (fr) * | 2000-08-31 | 2003-03-14 | Renault | Procede de regulation de distance entre deux vehicules |
SE0400605L (sv) * | 2004-03-09 | 2005-01-25 | Volvo Lastvagnar Ab | Metod, system och datorprogram för automatisk frihjulning av fordon |
SE529578C2 (sv) * | 2005-04-04 | 2007-09-25 | Scania Cv Abp | Ett förfarande och ett system för att styra driften av ett fordon |
JP4640044B2 (ja) * | 2005-06-01 | 2011-03-02 | トヨタ自動車株式会社 | 自動車およびその制御方法 |
JP2007159704A (ja) * | 2005-12-12 | 2007-06-28 | Motokoma Kk | 商品陳列用吊り装置 |
JP2007170274A (ja) * | 2005-12-22 | 2007-07-05 | Denso Corp | 車両制御装置 |
JP4446978B2 (ja) * | 2006-04-28 | 2010-04-07 | トヨタ自動車株式会社 | 車両用駆動力制御装置 |
JP4713408B2 (ja) * | 2006-06-07 | 2011-06-29 | トヨタ自動車株式会社 | 車両の制御装置 |
-
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- 2009-12-02 US US13/133,035 patent/US8532905B2/en active Active
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JP2000306200A (ja) * | 1993-03-17 | 2000-11-02 | Denso Corp | 車両制御装置 |
JP2005132356A (ja) * | 2003-10-30 | 2005-05-26 | Robert Bosch Gmbh | 駆動ユニットの運転方法 |
JP2007156704A (ja) | 2005-12-02 | 2007-06-21 | Nissan Diesel Motor Co Ltd | 省燃費運転システム |
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JP5116647B2 (ja) | 2013-01-09 |
CN102239319A (zh) | 2011-11-09 |
EP2357342A4 (en) | 2016-06-29 |
EP2357342B1 (en) | 2017-11-15 |
US8532905B2 (en) | 2013-09-10 |
JP2010133314A (ja) | 2010-06-17 |
US20110238278A1 (en) | 2011-09-29 |
EP2357342A1 (en) | 2011-08-17 |
CN102239319B (zh) | 2013-08-07 |
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