WO2013190652A1 - 車両の制御装置 - Google Patents
車両の制御装置 Download PDFInfo
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- WO2013190652A1 WO2013190652A1 PCT/JP2012/065698 JP2012065698W WO2013190652A1 WO 2013190652 A1 WO2013190652 A1 WO 2013190652A1 JP 2012065698 W JP2012065698 W JP 2012065698W WO 2013190652 A1 WO2013190652 A1 WO 2013190652A1
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- vehicle
- vehicle speed
- predetermined
- control
- speed
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Classifications
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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
- B60W30/14—Adaptive cruise control
- B60W30/143—Speed control
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
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- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/02—Clutches
- B60W2710/021—Clutch engagement state
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16D2500/3125—Driving resistance, i.e. external factors having an influence in the traction force, e.g. road friction, air resistance, road slope
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16D2500/3128—Distance from the vehicle to an external element, e.g. to an obstacle, to an other vehicle or a target
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
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- F16D2500/31433—Brake pedal position threshold, e.g. switch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
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- F16D2500/31453—Accelerator pedal position threshold, e.g. switch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/504—Relating the engine
- F16D2500/5043—Engine fuel consumption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
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- F16D2500/50—Problem to be solved by the control system
- F16D2500/508—Relating driving conditions
- F16D2500/50825—Hill climbing or descending
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/508—Relating driving conditions
- F16D2500/5085—Coasting
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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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
Definitions
- the present invention includes a clutch mechanism capable of selectively connecting and disconnecting a power transmission path between a driving force source and a driving wheel, and allows the vehicle to coast by inertia by releasing the clutch mechanism during traveling.
- the present invention relates to a possible vehicle control apparatus.
- Fuel cut when the accelerator is returned during traveling, that is, when the accelerator opening is fully closed, for example, under a predetermined condition such as an engine speed equal to or higher than an idling speed and a predetermined vehicle speed or higher, This is control for stopping the supply of fuel to the engine.
- the engine stops the combustion operation when the fuel supply is cut off, but is rotated by the torque transmitted from the drive wheel side. Therefore, at the time of fuel cut execution, braking torque acts on the drive wheels due to the pumping loss, friction torque, etc. of the engine. That is, a so-called engine brake is applied to the vehicle.
- coasting control when the accelerator is returned during traveling, for example, by releasing the clutch provided between the engine and the drive wheel, to interrupt the power transmission between the engine and the drive wheel, In this control, the vehicle is coasted without the engine being rotated. Accordingly, when the coasting control is executed, the engine brake is not applied to the vehicle, so that the vehicle can travel inertially by effectively utilizing the inertia energy.
- this coasting control there are a case where the fuel supply to the engine is stopped while the coasting control is being executed, and a case where the engine rotational speed is reduced to about the idle rotational speed and the engine combustion operation is not stopped.
- the engine is stopped as in the former case, fuel is not consumed while the vehicle is coasting, so that a greater fuel efficiency improvement effect can be obtained.
- the engine is not stopped as in the latter case, the effect of improving the fuel consumption cannot be expected as much as when the engine is stopped, but in order to secure the hydraulic pressure when the engine is stopped, such as an electric oil pump or a hydraulic accumulator. It is not necessary to provide a necessary device separately.
- coasting control can be easily executed without changing the structure of the vehicle having the conventional configuration or adding a new device or equipment.
- the coasting control that does not stop the engine as in the latter case will be referred to as neutral coasting control or N coasting control.
- Japanese Patent Application Laid-Open No. 2011-117497 An example of the invention related to coasting control as described above is described in Japanese Patent Application Laid-Open No. 2011-117497.
- the invention described in Japanese Patent Application Laid-Open No. 2011-117497 relates to a vehicle drive device that includes an engine and an electromagnetic clutch that connects or disconnects a power transmission path between the engine and drive wheels. .
- the invention described in Japanese Patent Application Laid-Open No. 2011-117497 is an electromagnetic field in which the engine braking force generated in the vehicle braking direction from the engine is greater than or equal to the accelerator driving force generated in the vehicle driving direction based on the accelerator operation. The power transmission path between the engine and the drive wheels is blocked by a clutch.
- 2011-117497 discloses a power transmission capacity of an electromagnetic clutch when a brake for braking the drive wheel is operated while the power transmission path between the engine and the drive wheel is interrupted. There is described a configuration in which the power transmission paths are connected by increasing them at a constant rate determined in advance.
- Japanese Patent Laid-Open No. 2002-227885 includes a clutch provided in a power transmission system for transmitting engine rotation output to driving wheels, and a control valve for opening and closing the clutch, and controls the control valve.
- An invention relating to a clutch control device for setting a control mode for coasting the vehicle by opening the clutch is described.
- Japanese Patent Laid-Open No. 2002-227885 discloses that when the brake pedal is stepped on at a predetermined pressure or higher by a driving operation, the distance between the vehicle and the preceding vehicle becomes a predetermined value or less, and the vehicle speed is a predetermined upper limit. Alternatively, it is described that the control mode is canceled when the lower limit is exceeded.
- the engine rotational speed is adjusted so that the clutch rotational speed difference becomes a predetermined value or less during inertial running in the control mode, and the clutch rotational speed difference is reduced when the control mode is released. Therefore, it is described that the control of the clutch is temporarily waited.
- Japanese Patent Application Laid-Open No. 2010-60010 includes a clutch that connects and disconnects a power transmission path between a driving force source having an engine and driving wheels, and performs constant speed traveling control that keeps the vehicle speed constant during downhill traveling.
- An invention relating to a control device for an automatic transmission is described.
- Japanese Patent Laid-Open No. 2010-60010 discloses a clutch slip engagement control while maintaining a gear ratio when a vehicle travels on a gentle slope downhill whose road surface inclination angle is less than a set value. In the case where the vehicle travels on a steep downhill whose inclination angle is equal to or greater than a set value, it is described that shift control is performed to keep the vehicle speed constant.
- Japanese Patent Application Laid-Open No. 2011-144878 transmits engine power to the drive wheel side by engaging, and a cushion plate, which is a spring material, is mounted between the friction engagement element and the pressing portion of the piston.
- a cushion plate which is a spring material
- the hydraulic friction engagement device is in a slip state or a release state, and the power transmission path between the engine and the drive wheels is in a state where power transmission is suppressed.
- an invention relating to a hydraulic control device for a vehicle power transmission device that executes neutral control for suppressing an idling load of an engine is described.
- Japanese Patent Laid-Open No. 2011-144878 discloses that when releasing the neutral control, the cushion plate is crushed when the engagement pressure is increased to engage the hydraulic friction engagement device. It is described that the increase of the engagement pressure is temporarily waited at a stand-by pressure immediately before the hydraulic pressure corresponding to the load is applied to the cushion plate.
- the brake when executing coasting control, the brake is operated in a state where the power transmission path between the engine and the drive wheels is interrupted. In some cases, a power transmission path is connected. That is, coasting control is terminated. Therefore, according to the invention described in Japanese Patent Application Laid-Open No. 2011-117497, for example, a pumping loss of an engine, a friction torque, etc. in addition to a vehicle brake that brakes a drive wheel by a brake operation such as depression of a brake pedal. The vehicle is also braked by an engine brake effect that acts as a running load. Therefore, it is supposed that the vehicle can be braked quickly according to the driver's intention.
- the present invention has been made paying attention to the above technical problem, and it is possible to efficiently and appropriately perform coasting control in which the vehicle is coasted by interrupting power transmission between the driving force source and the driving wheel during traveling. It is an object of the present invention to provide a vehicle control device that can be executed.
- the present invention includes a clutch mechanism that selectively connects or disconnects a power transmission path between a driving force source and a driving wheel, and interrupts the power transmission path during traveling.
- a vehicle control apparatus capable of coasting a vehicle, a means for detecting a vehicle speed, a means for detecting an accelerator operation by a driver, a means for detecting a brake operation by the driver, and the accelerator operation during traveling
- An executing means for executing coasting control for allowing the vehicle to coast freely by releasing the clutch mechanism and shutting off the power transmission path when the operation amount of the vehicle is returned to a predetermined operation amount or less, and the coasting control
- a determination means for determining whether or not the driver's deceleration request is larger than a predetermined value based on the vehicle speed and the brake operation, and the deceleration request is larger than the predetermined value.
- a ending unit that determines that the deceleration request is strong and engages the clutch mechanism and connects the power
- the determination means in the present invention may be configured to determine that the deceleration request is strong when the vehicle travels at a vehicle speed equal to or higher than a predetermined vehicle speed and the brake operation is continued for a predetermined time or more.
- the determination means in the present invention determines that the deceleration request is strong when the vehicle travels at a vehicle speed equal to or higher than a predetermined vehicle speed and the operation amount of the brake operation exceeds a predetermined operation amount. Can be configured.
- the present invention can further comprise means for detecting the gradient of the travel path.
- the determination means in the present invention is configured to determine that the deceleration request is strong when the vehicle travels on a downhill road having a vehicle speed equal to or higher than a predetermined vehicle speed and equal to or higher than a predetermined gradient. it can.
- the present invention can further include means for detecting the deceleration of the vehicle.
- the determination means in the present invention is configured to determine that the deceleration request is strong when the vehicle travels at a vehicle speed equal to or higher than a predetermined vehicle speed and the deceleration becomes equal to or higher than a predetermined deceleration. can do.
- the present invention can further include means for detecting an inter-vehicle distance between the host vehicle and another vehicle traveling in front of the host vehicle.
- the determination means in the present invention is configured to determine that the deceleration request is strong when the vehicle travels at a vehicle speed equal to or higher than a predetermined vehicle speed and the inter-vehicle distance becomes equal to or less than a predetermined distance. be able to.
- end means in the present invention is configured to end the coasting control when the vehicle is traveling at a vehicle speed lower than the predetermined vehicle speed when the brake operation is performed. it can.
- the determination means in the present invention can be configured to estimate a probability that the deceleration request is determined to be strong based on the vehicle speed and the brake operation. In that case, when it is estimated that the probability is high, the rotational force of the driving force source side in the clutch mechanism is controlled by controlling the rotational speed of the driving force source prior to the end of the coasting control.
- a standby unit that reduces a difference in rotational speed between the rotating member on the driving wheel side can be further provided.
- the determination unit according to the present invention is configured such that the vehicle travels at a vehicle speed equal to or higher than a predetermined vehicle speed and the brake operation is continued for a first operation time or longer.
- the probability is high when the deceleration request is strong, and when the brake operation is continued for a second predetermined time set to a time shorter than the first operation time. Can be configured.
- the determination unit is configured such that the vehicle is traveling at a vehicle speed equal to or higher than a predetermined vehicle speed, and the operation amount of the brake operation is a first operation amount.
- the means for determining that the deceleration request is strong and the operation amount of the brake operation is equal to or larger than the second operation amount set to an operation amount smaller than the first operation amount, It can be configured to estimate that the probability is high.
- the present invention can further comprise means for detecting the gradient of the travel path.
- the determination unit according to the present invention is configured such that the vehicle decelerates when the vehicle travels on a downhill road with a vehicle speed equal to or higher than a predetermined vehicle speed and equal to or higher than a first gradient. It can be configured that it is estimated that the probability is high when means for judging that the request is strong and when the vehicle travels on a downhill road with a second gradient or more gentler than the first gradient.
- the present invention can further include means for detecting a vehicle speed increase amount.
- the determination unit according to the present invention is configured such that the vehicle is traveling at a vehicle speed equal to or higher than a predetermined vehicle speed, and the speed increase amount is greater than or equal to the first speed increase amount.
- the means for determining that the deceleration request is strong, and the probability that the probability is high when the acceleration amount is equal to or greater than a second acceleration amount that is smaller than the first acceleration amount. can be configured.
- this invention can further be provided with a means to detect the inter-vehicle distance between the own vehicle and other vehicles which run ahead.
- the determination unit according to the present invention is such that the vehicle is traveling at a vehicle speed equal to or higher than a predetermined vehicle speed, and the inter-vehicle distance is equal to or less than the first inter-vehicle distance.
- the clutch mechanism when the accelerator operation amount is returned to a predetermined operation amount or less during traveling, the clutch mechanism is released and the power transmission path between the driving force source and the driving wheels is interrupted. That is, coasting control is executed and the vehicle travels coasting. Therefore, the traveling distance of the vehicle in a state where no load is applied to the driving force source can be extended, and as a result, the energy efficiency of the vehicle can be improved.
- the degree of deceleration demand of the driver is estimated based on the vehicle speed and the degree of brake operation such as the operation time and the operation amount of the brake. For example, when the operation time of a brake operated at a predetermined vehicle speed is long, or when the operation amount of the brake operated at a predetermined vehicle speed is large, it is estimated that the driver's request for deceleration is strong. When it is determined that the driver's deceleration request is strong enough for the vehicle to continue to require braking force, the clutch mechanism is engaged and coasting control is terminated.
- the vehicle can be decelerated by generating a braking force in accordance with the driver's deceleration request or braking intention. As a result, the drivability of the vehicle can be improved.
- the driver's deceleration request is weak, for example, because the operating time of the brake operated under a predetermined vehicle speed is short or the amount of operation of the brake operated under the predetermined vehicle speed is small.
- coasting control is continued.
- the driver's deceleration request is weak, it can be determined that it is not necessary to end coasting control and to generate braking force on the vehicle, so coasting control is continued. Therefore, in this case, the energy efficiency of the vehicle can be improved by continuing the state where the vehicle is coasting.
- the driver's deceleration request is estimated, and execution and termination of coasting control are determined according to the degree of the driver's deceleration request. The Therefore, it is possible to achieve both improvement in vehicle drivability and improvement in efficiency by coasting control.
- the degree of deceleration demand of the driver is as follows between the vehicle speed and the operation time of the brake operation, the operation amount of the brake operation, the gradient of the travel path, the deceleration of the vehicle, or the preceding vehicle. Is estimated based on the distance between the vehicles. Therefore, the driver's deceleration request can be accurately estimated, and as a result, coasting control can be executed appropriately.
- the coasting control when executing the coasting control, the continuation or termination of the coasting control is determined in consideration of the vehicle speed, but when the brake is operated when the vehicle speed is low, The coasting control is immediately terminated.
- the brake operation when the vehicle is traveling at a medium-high speed range where the vehicle speed is somewhat high is a brake operation for slightly reducing the vehicle speed.
- the brake operation when the vehicle is traveling at a vehicle speed in a low speed range where the vehicle speed is low is often a brake operation for sufficiently decelerating the vehicle or stopping the vehicle. Therefore, as described above, the coasting control according to the present invention can be more appropriately executed by changing the manner of execution and termination of the coasting control according to the vehicle speed.
- the probability that the deceleration request is judged to be strong is estimated. And when it is estimated that the probability that it is judged that the deceleration request
- the probability that the driver's deceleration request as described above is determined to be strong is the operation time of the brake operation, the operation amount of the brake operation, the gradient of the travel path, the speed increase amount of the vehicle speed, or the preceding vehicle Is estimated based on the distance between the two vehicles. Therefore, it is possible to accurately estimate the probability that the driver's deceleration request is strong, and as a result, coasting control can be performed more appropriately.
- FIG. 3 is a time chart for explaining a coasting control implementation state and a method for estimating a driver's deceleration request when executing the first control example shown in FIG. 2.
- FIG. 6 is a time chart for explaining an execution state of coasting control and a method of estimating a probability that a driver's deceleration request is strong when the second control example shown in FIG. 5 is executed.
- FIG. 1 shows a drive system and a control system of a vehicle to be controlled in the present invention.
- a vehicle Ve shown in FIG. 1 includes an engine 1 and an automatic transmission 3 that is connected to the output side of the engine 1 and transmits power output from the engine 1 to drive wheels 2.
- an automatic transmission 3 is provided on the output side of the engine 1, and a drive wheel 2 is connected to a propeller shaft 4 connected to an output shaft 3 a of the automatic transmission 3 via a differential gear 5 and a drive shaft 6.
- a differential gear 5 and a drive shaft 6. are connected so that power can be transmitted.
- the vehicle Ve to be controlled in the present invention may be a front wheel drive vehicle or a four wheel drive vehicle.
- Engine 1 is a driving force source in the present invention, and is an internal combustion engine that outputs power by burning fuel, such as a gasoline engine, a diesel engine, or a natural gas engine.
- fuel such as a gasoline engine, a diesel engine, or a natural gas engine.
- FIG. 1 an electronically controlled throttle valve capable of electrically controlling the throttle opening and an electronically controlled fuel injection device capable of electrically controlling the fuel injection amount are provided.
- An example with a gasoline engine is shown. Therefore, the engine 1 is configured to be able to be operated with the best fuel efficiency by electrically controlling the rotational speed with respect to a predetermined load.
- the automatic transmission 3 is a transmission that shifts the torque output from the engine 1 and transmits the torque to the drive wheels 2.
- the vehicle Ve according to the present invention can be driven by any one of the rear wheel drive, the front wheel drive, and the four wheel drive, regardless of whether the automatic transmission 3 uses any of the above-described transmissions.
- the clutch mechanism 7 that selectively connects or disconnects the power transmission path between the engine 1 and the drive wheels 2 is provided.
- the automatic transmission 3 is configured by a stepped AT using a planetary gear.
- the configuration is the same as that of a conventional general AT, and a plurality of planetary gears (not shown), a forward clutch 7a that is engaged when setting the forward gear, and a gear when setting the reverse gear. And a reverse brake 7b.
- a clutch or a brake that is engaged when setting a specific forward gear is provided.
- the neutral state in the automatic transmission 3 is set. That is, by releasing all of the forward clutch 7a and the reverse brake 7b, the power transmission path between the engine 1 and the drive wheels 2 can be interrupted. Therefore, in the example shown in FIG. 1, the clutch mechanism 7 including the forward clutch 7a and the reverse brake 7b corresponds to the clutch mechanism in the present invention.
- a general belt type CVT is a forward / reverse switching for switching the rotation direction of the torque transmitted to the belt transmission mechanism and the drive wheel 2 between the forward direction and the reverse direction.
- the forward / reverse switching mechanism is provided with a forward clutch that is engaged when setting the forward movement state and a reverse brake that is engaged when setting the reverse movement state. Then, by releasing both the forward clutch and the reverse brake, the power transmission path between the engine 1 and the automatic transmission 3 is interrupted. That is, the neutral state is set in the automatic transmission 3. Therefore, in this case, the clutch mechanism in the present invention can be configured by the forward clutch and the reverse brake.
- the clutch mechanism according to the present invention can be configured by the two clutches described above.
- the clutch mechanism according to the present invention can be configured by the above-described clutch.
- a hybrid vehicle equipped with an internal combustion engine and an electric motor as a driving force source can be controlled.
- an electric vehicle equipped with an electric motor as a driving force source can be controlled.
- the vehicle Ve in the present invention is as described above regardless of the configuration of the driving force source of any configuration such as the engine 1, the electric motor, or the hybrid driving unit in which the engine 1 and the electric motor are combined.
- a clutch mechanism 7 is provided for selectively connecting or disconnecting a power transmission path between the driving force source and the driving wheel 2.
- the clutch mechanism 7 may be, for example, either a friction clutch or a meshing clutch.
- a friction clutch is used, either a wet type or a dry type may be used.
- the clutch mechanism 7 in the present invention is capable of selectively transmitting and interrupting torque between the driving force source such as the engine 1, the electric motor, or the hybrid driving unit and the driving wheel 2. That's fine.
- the braking force is applied to the vehicle Ve by regeneratively controlling the electric motor with the clutch mechanism 7 engaged. Can be generated. That is, when the vehicle Ve is traveling, the vehicle Ve can be braked by applying a braking torque to the drive wheels 2 by regenerating the motor of the driving force source with the clutch mechanism 7 engaged. .
- An electronic control unit (ECU) 8 for controlling the operation state of the engine 1 and the engagement and disengagement states of the clutch mechanism 7 as described above is provided.
- the electronic control unit 8 is configured mainly by a microcomputer, for example, and is configured to perform a calculation based on input data or data stored in advance and output a control command signal.
- the electronic control unit 8 includes a wheel speed sensor 9 that detects the rotational speed of each wheel of the vehicle Ve, an accelerator sensor 10 that detects the depression angle or depression amount of the accelerator pedal, a depression angle of the brake pedal, The brake sensor 11 that detects the amount of depression, the acceleration sensor 12 that detects the acceleration of the vehicle Ve, the inclination angle sensor 13 that detects the inclination angle of the vehicle Ve, and the inter-vehicle distance between the vehicle Ve and the vehicle traveling in front of it. Detection signals from various sensors such as the distance sensor 14 to be detected are input.
- the electronic control unit 8 is configured to output a signal for controlling the operating state of the engine 1, a signal for controlling the engagement and disengagement states of the clutch mechanism 7, and the like.
- a detection signal such as a sensor or a resolver for detecting the rotation speed of the electric motor is input to the electronic control device 8.
- the electronic control device 8 outputs a signal for controlling the operation state of the electric motor.
- the so-called coasting control is performed in which the vehicle Ve is coasted by releasing the clutch mechanism 7 in order to improve the fuel consumption of the vehicle Ve. can do.
- the coasting control in the present invention means that the clutch mechanism 7 is released when the vehicle Ve is traveling at a predetermined vehicle speed or more, for example, when the depression amount of the accelerator pedal is returned to 0 or less than a predetermined operation amount.
- the power transmission path between the engine 1 and the drive wheels 2 is cut off.
- the neutral coasting control in the present invention the engine 1 is not stopped. That is, while the neutral coasting control is being executed, the engine 1 is reduced in its idling speed to about the idling speed, but the combustion operation is continued.
- the coasting control as described above When the coasting control as described above is performed, the power transmission between the engine 1 and the drive wheels 2 is interrupted while the vehicle Ve is traveling. As a result, the braking torque resulting from the pumping loss or drag torque of the engine 1 is not transmitted to the drive wheels 2 of the vehicle Ve. That is, a so-called engine brake is not applied to the vehicle Ve. Therefore, by executing the coasting control as described above, the distance that the vehicle Ve can coast by inertia energy is increased, and as a result, the travel distance per unit fuel consumption of the vehicle Ve is increased. That is, the fuel efficiency of the vehicle Ve is improved.
- the fuel consumption of the vehicle Ve can be further improved by releasing the clutch mechanism 7 and stopping the combustion operation of the engine 1.
- auxiliary equipment such as an oil pump and a compressor for an air conditioner, and a power source for driving a hydraulic power steering, a brake device and the like are lost. . Therefore, in that case, it is necessary to equip an alternative power source (for example, an electric motor) corresponding to the case where the engine 1 is stopped, a hydraulic accumulator, and the like separately.
- an alternative power source for example, an electric motor
- the neutral coasting control that does not stop the engine 1, the power source of the auxiliary machine, the power steering, or the brake device as described above is not lost during the execution of the control. There is no need to provide it. Therefore, it is possible to easily execute the neutral coasting control for a vehicle having a conventional configuration.
- the control device appropriately controls the braking force of the vehicle Ve by appropriately determining the continuation and termination of the coasting control when the brake is operated by the driver during the coasting control. It is configured to be able to.
- a first control example of coasting control in the present invention is shown in the flowchart of FIG.
- the routine shown in this flowchart is repeatedly executed every predetermined short time.
- various data relating to the running state and the operating state of the vehicle Ve are acquired (step S1). Specifically, the vehicle speed is obtained from the detection value of the wheel speed sensor 9. Further, the accelerator operation amount by the driver is obtained from the detection value of the accelerator sensor 10. Further, the brake operation amount by the driver is obtained from the detection value of the brake sensor 11. Further, the gradient of the traveling road is obtained from the detection value of the acceleration sensor 12 or the detection value of the inclination angle sensor 13. Then, the inter-vehicle distance from the vehicle ahead is obtained from the detection value of the distance sensor 14.
- Whether or not the coasting control can be executed is determined based on the various data obtained in step S1 (step S2). That is, it is determined whether or not the coasting control execution condition is satisfied.
- An execution condition of the coasting control is that the accelerator operation amount is returned to 0 or less than a predetermined operation amount when the vehicle Ve is traveling at a vehicle speed equal to or higher than the reference vehicle speed ⁇ .
- the coasting control according to the present invention is configured to start the control when the vehicle Ve is traveling at a vehicle speed equal to or higher than the reference vehicle speed ⁇ , triggered by the accelerator operation amount being returned to 0 or less than a predetermined operation amount. Has been.
- the fact that the accelerator operation amount is returned to 0 or below a predetermined operation amount means that the accelerator pedal that has been depressed by the driver is returned to a released state, for example.
- the accelerator operation amount that is a determination criterion does not necessarily have to be 0.
- coasting control is started when the accelerator operation amount is returned to a predetermined operation amount A or less.
- the predetermined operation amount A can be set so as to increase or decrease according to the engine speed Ne.
- the reference vehicle speed ⁇ is a reference value for determining the execution of the coasting control, and is set as a threshold for determining a vehicle speed range in which the coasting control is effective, for example.
- the vehicle Ve includes a torque converter
- the vehicle speed when the vehicle Ve travels due to a creep phenomenon is, for example, about 15 to 20 km / h. Is set.
- the reference vehicle speed ⁇ can be set in advance based on results of experiments, simulations, and the like.
- the coasting control is performed on a road having a predetermined gradient range with a gradient of 0%, and that the engine 1 is in a combustion operation as the coasting control execution condition.
- the predetermined gradient range is a range used as a reference for determining an uphill road and a downhill road where the influence on a flat road having a gradient of 0% and a traveling load can be ignored, and results of experiments and simulations are obtained. This is a preset range.
- the predetermined gradient range may be set according to the vehicle speed. For example, a gradient range of about ⁇ 2% is set when the vehicle speed is less than 40 km / h, and a gradient range of about ⁇ 4% is set when the vehicle speed is 40 km / h or higher. .
- the execution of the coasting control is determined when all the execution conditions for the coasting control are satisfied. That is, the vehicle Ve generates driving force by the output of the engine 1, travels on a road within a predetermined gradient range at a vehicle speed equal to or higher than the reference vehicle speed ⁇ , and the accelerator operation amount is a predetermined operation amount.
- the execution of coasting control is permitted when it returns to:
- step S3 coasting control is not executed, and normal control is executed. Is done. For example, a fuel cut that temporarily stops fuel supply to the engine 1 during traveling is executed.
- control for regenerating the electric motor and outputting a regenerative torque is executed. That is, the vehicle Ve is controlled so that a braking force by a so-called engine brake or regenerative torque of the electric motor is applied to the vehicle Ve. If coasting control has already been performed, the coasting control is terminated.
- the clutch mechanism 7 that has been released to perform coasting control is engaged, and power transmission between the engine 1 and the drive wheels 2 is enabled. At the same time, normal control such as fuel cut and regenerative control of the electric motor is performed. Thereafter, this routine is once terminated.
- step S2 determines whether or not the brake is ON, that is, the brake is applied by the driver. It is determined whether or not an operation has been performed. If a negative determination is made in step S4 because no brake operation has been performed, the process proceeds to step S5 and coasting control is executed. If coasting control has not been executed yet, coasting control is started. If coasting control has already been performed, the coasting control is continued.
- the clutch mechanism 7 is released and the vehicle Ve travels inertially. Further, the engine 1 is in a no-load state because the power transmission with the drive wheel 2 is cut off.
- the engine 1 is controlled so that the engine speed is reduced to the idling engine speed.
- the idling rotational speed referred to here is a rotational speed that is lower than the normal range of the rotational speed of the engine 1 that is operated during normal traveling, and is the lower limit rotational speed at which the unloaded engine 1 can autonomously rotate. It is a number.
- the normal traveling is a state in which the vehicle Ve travels with power output from the engine 1 with the clutch mechanism 7 engaged. As described above, when coasting control is executed in step S5, this routine is once ended.
- step S4 if a positive determination is made in step S4 due to the brake being operated by the driver, for example, depression of the brake pedal, the process proceeds to step S6. Then, it is determined whether or not the current vehicle speed is equal to or higher than a predetermined vehicle speed ⁇ .
- the predetermined vehicle speed ⁇ is a threshold value for determining a medium-high speed vehicle speed range, and is set to a value larger than the reference vehicle speed ⁇ described above.
- the brake operation during traveling often has different roles depending on the vehicle speed. For example, a brake operation in a medium to high speed range where the vehicle speed is somewhat high is often a slight brake operation intended to slightly reduce the vehicle speed.
- a brake operation in a low speed range where the vehicle speed is low is often a brake operation intended to sufficiently decelerate the vehicle or to stop the vehicle. Therefore, in this step S6, the medium / high speed range where there are many brake operations intended to slightly reduce or temporarily reduce the vehicle speed, and the low speed where there are many brake operations intended to sufficiently reduce the vehicle speed or stop the vehicle Ve.
- a vehicle speed that is a threshold between the vehicle and the vehicle is set as a predetermined vehicle speed ⁇ .
- the predetermined vehicle speed ⁇ can be set in advance based on results of experiments, simulations, and the like. For example, a vehicle speed of about 50 to 60 km / h is set.
- step S6 If the current vehicle speed is lower than the predetermined vehicle speed ⁇ and a negative determination is made in step S6, the process proceeds to step S3 described above, and normal control is executed without executing coasting control. If coasting control has already been executed, the coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed. That is, if the vehicle speed when the brake is operated by the driver is lower than the predetermined vehicle speed ⁇ during the coasting control, the coasting control is immediately terminated. In other words, coasting control is terminated and the normal control state is restored. Specifically, as shown in the time chart of FIG.
- step S6 determines whether or not the brake operation has been continued for a predetermined time T or longer. This is determined by estimating the degree of deceleration demand or the willingness of braking by the driver. Specifically, when the brake operation by the driver is continued for a predetermined time T or more, it is determined that the driver's deceleration request is strong. When the brake operation by the driver has not been continued for a predetermined time T or longer, it is determined that the driver's deceleration request is weak.
- the predetermined time T can be set in advance based on results of experiments, simulations, and the like. For example, a time of about 2 seconds is set.
- step S7 If it is determined negative in step S7 because the brake operation has not been continued for a predetermined time T or more, that is, it is determined that the driver's deceleration request is weak, the process proceeds to step S5 described above. Similarly, coasting control is executed. That is, coasting control is started or ongoing coasting control is continued. Thereafter, this routine is once terminated.
- step S7 if it is determined affirmative in step S7 because the brake operation has been continued for a predetermined time T or more, that is, it is determined that the driver's deceleration request is strong, the process proceeds to step S3 described above. move on. Similarly, the coasting control is not executed and normal control is executed. If coasting control has already been executed, the coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed.
- the coasting control flag is set to “OFF” at a time t1 when a predetermined time T has elapsed from the time t0 when the brake operation is started. . That is, coasting control is terminated and the normal control state is restored. As a result, the vehicle Ve enters a state in which a so-called engine brake is applied, and is braked by both braking forces of a braking device provided by the wheels and a braking force of a so-called engine brake. Thereafter, even when the operation amount of the brake operation is returned to 0 and the braking by the braking device is released, the state where the engine brake is applied as described above is continued. As a result, an increase in vehicle speed is suppressed. Alternatively, the vehicle speed is reduced. Thereafter, this routine is once terminated.
- step S7 in the flowchart of FIG. 2, that is, the control for estimating and determining the degree of the driver's deceleration request is executed as in the other control examples described below.
- step S7 it is determined whether or not the brake operation by the driver has been performed for a predetermined operation amount B or more. For example, if the amount of brake operation by the driver is greater than or equal to the predetermined operation amount B, such as the amount of depression of the brake pedal or the depression angle, it is determined that the driver's request for deceleration is strong. When the brake operation amount by the driver is less than the predetermined operation amount B, it is determined that the driver's deceleration request is weak.
- the predetermined operation amount B such as the amount of depression of the brake pedal or the depression angle
- step S7 If a negative operation is determined in step S7 because the brake operation of the predetermined operation amount B or more has not yet been performed, the process proceeds to step S5, and coasting control is executed as before. That is, coasting control is started or ongoing coasting control is continued. In addition, if a positive determination is made in step S7 because a brake operation of a predetermined operation amount B or more has been performed, the process proceeds to step S3, and coasting control is not executed as before. Alternatively, coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed.
- the time when the brake operation amount at time t0 when the brake operation is started is 0, and then the brake operation amount reaches the predetermined operation amount B.
- coasting control is terminated.
- a so-called engine brake is applied to the vehicle Ve. That is, when the brake operation amount reaches the predetermined operation amount B, it is determined that the driver's deceleration request is strong, and both the braking force by the braking device mounted on the wheel and the braking force by the so-called engine brake are applied.
- the vehicle Ve is braked.
- the predetermined operation amount B can be set in advance based on results of experiments, simulations, and the like. For example, an operation amount of about 30% is set.
- step S7 it is determined in step S7 whether or not the gradient of the traveling road is a downward gradient equal to or greater than a predetermined gradient C.
- the gradient of the travel path is a downward gradient equal to or greater than the predetermined gradient C
- the gradient of the travel path is a downward gradient or an upward gradient less than the predetermined gradient C
- it is determined that the driver's deceleration request is weak.
- it is estimated that the deceleration request does not become strong.
- step S7 If the result of the determination in step S7 is negative due to the slope of the traveling road being a downward slope less than the predetermined slope C or an upward slope, the process proceeds to step S5, and coasting as before. Control is executed. That is, coasting control is started or ongoing coasting control is continued. Further, if the traveling road gradient is a downward gradient equal to or greater than the predetermined gradient C, if the determination in step S7 is affirmative, the process proceeds to step S3, and the coasting control is not executed as before. Alternatively, coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed.
- the coasting control is terminated at time t3 when the gradient of the traveling road becomes a downward gradient equal to or greater than the predetermined gradient C.
- a so-called engine brake is applied to the vehicle Ve. That is, it is estimated that the driver's deceleration request becomes strong when the gradient of the travel path becomes a descending gradient equal to or greater than the predetermined gradient C, and the braking force by the braking device mounted on the wheel and the braking force by the so-called engine brake The vehicle Ve is braked by both braking forces.
- the predetermined gradient C here can be set in advance based on the results of experiments, simulations, and the like, and for example, a downward gradient of about 5% is set.
- step S7 it is determined whether or not the deceleration of the vehicle Ve is equal to or greater than a predetermined deceleration D.
- a predetermined deceleration D it is determined that the driver's deceleration request is strong.
- the deceleration of the vehicle Ve is less than the predetermined deceleration D, it is determined that the driver's deceleration request is weak. If the vehicle Ve is less than the predetermined deceleration D and thus a negative determination is made in step S7, the process proceeds to step S5, and coasting control is executed as before. That is, coasting control is started or ongoing coasting control is continued.
- step S7 determines whether the vehicle Ve is decelerated at or above the predetermined deceleration D. If the determination in step S7 is affirmative, the process proceeds to step S3, and the coasting control is not executed as before. Alternatively, coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed.
- coasting control is terminated at time t4 when the deceleration of the vehicle Ve becomes equal to or greater than a predetermined deceleration D.
- a so-called engine brake is applied to the vehicle Ve. That is, when the deceleration of the vehicle Ve reaches the predetermined deceleration D, it is determined that the driver's request for deceleration is strong, and both the braking force by the braking device mounted on the wheels and the braking force by the so-called engine brake are provided.
- the vehicle Ve is braked by the braking force.
- the predetermined deceleration D can be set in advance based on the results of experiments, simulations, and the like. For example, a deceleration of about 0.1 G is set.
- step S7 it is determined whether or not the inter-vehicle distance between the vehicle Ve and another vehicle traveling in front of the vehicle Ve is equal to or less than a predetermined distance L.
- the inter-vehicle distance from the preceding vehicle is equal to or less than the predetermined distance L, it is estimated that the driver's deceleration request becomes strong.
- the inter-vehicle distance from the preceding vehicle is longer than the predetermined distance L, it is estimated that the driver's deceleration request will not become strong. If the distance between the preceding vehicle and the preceding vehicle is longer than the predetermined distance L, a negative determination is made in step S7, the process proceeds to step S5, and coasting control is executed as before.
- coasting control is started or ongoing coasting control is continued. Further, when the distance between the preceding vehicle and the preceding vehicle is equal to or less than the predetermined distance L, if the determination in step S7 is affirmative, the process proceeds to step S3, and coasting control is not performed as before. Alternatively, coasting control is terminated. Then, for example, normal control such as fuel cut and electric motor regeneration control as described above is executed.
- the coasting control is terminated at time t5 when the inter-vehicle distance from the preceding vehicle is equal to or less than the predetermined distance L.
- a so-called engine brake is applied to the vehicle Ve. That is, when the inter-vehicle distance from the preceding vehicle is reduced to a predetermined distance L, it is estimated that the driver's deceleration request becomes strong, and both the braking force by the braking device mounted on the wheel and the braking force by the so-called engine brake are both The vehicle Ve is braked by the braking force.
- the predetermined distance L can be set in advance based on results of experiments and simulations. Further, the predetermined distance L can be set to change at every predetermined vehicle speed or according to the vehicle speed. For example, when traveling at a vehicle speed of 80 km / h, a distance of about 50 m is set.
- the driver's degree of deceleration request is determined based on the vehicle speed, the operation time of the brake operation, the operation amount of the brake operation, the gradient of the travel path, the deceleration of the vehicle Ve, and the preceding vehicle. Can be estimated and determined based on the inter-vehicle distance. As a result, the driver's deceleration request can be estimated with high accuracy, and therefore coasting control can be executed appropriately.
- step S11 various data relating to the running state and the operating state of the vehicle Ve are acquired (step S11). Specifically, the vehicle speed is obtained from the detection value of the wheel speed sensor 9. Further, the accelerator operation amount by the driver is obtained from the detection value of the accelerator sensor 10. Further, the brake operation amount by the driver is obtained from the detection value of the brake sensor 11. Further, the gradient of the traveling road is obtained from the detection value of the acceleration sensor 12 or the detection value of the inclination angle sensor 13. Then, the inter-vehicle distance from the vehicle ahead is obtained from the detection value of the distance sensor 14.
- Whether or not the coasting control can be executed is determined based on the various data obtained in step S11 (step S12). That is, it is determined whether or not the coasting control execution condition is satisfied.
- An execution condition of the coasting control is that the accelerator operation amount is returned to 0 or less than a predetermined operation amount when the vehicle Ve is traveling at a vehicle speed equal to or higher than the reference vehicle speed ⁇ .
- the coasting control according to the present invention is configured to start the control when the vehicle Ve is traveling at a vehicle speed equal to or higher than the reference vehicle speed ⁇ , triggered by the accelerator operation amount being returned to 0 or less than a predetermined operation amount. Has been.
- the fact that the accelerator operation amount is returned to 0 or below a predetermined operation amount means that the accelerator pedal that has been depressed by the driver is returned to a released state, for example.
- the accelerator operation amount that is a determination criterion does not necessarily have to be 0.
- coasting control is started when the accelerator operation amount is returned to a predetermined operation amount A or less.
- the predetermined operation amount A can be set so as to increase or decrease according to the engine speed Ne.
- the reference vehicle speed ⁇ is a reference value for determining the execution of the coasting control, and is set as a threshold for determining a vehicle speed range in which the coasting control is effective, for example.
- the vehicle Ve includes a torque converter
- the vehicle speed when the vehicle Ve travels due to a creep phenomenon is, for example, about 15 to 20 km / h. Is set.
- the reference vehicle speed ⁇ can be set in advance based on results of experiments, simulations, and the like.
- the coasting control is performed on a road having a predetermined gradient range with a gradient of 0%, and that the engine 1 is in a combustion operation as the coasting control execution condition.
- the predetermined gradient range is a range used as a reference for determining an uphill road and a downhill road where the influence on a flat road having a gradient of 0% and a traveling load can be ignored, and results of experiments and simulations are obtained. This is a preset range.
- the predetermined gradient range may be set according to the vehicle speed. For example, a gradient range of about ⁇ 2% is set when the vehicle speed is less than 40 km / h, and a gradient range of about ⁇ 4% is set when the vehicle speed is 40 km / h or higher. .
- execution of coasting control is determined when all the execution conditions for coasting control are satisfied. That is, the vehicle Ve generates driving force by the output of the engine 1, travels on a road within a predetermined gradient range at a vehicle speed equal to or higher than the reference vehicle speed ⁇ , and the accelerator operation amount is a predetermined operation amount. When the value is returned to A or less, execution of coasting control is permitted.
- step S12 the process proceeds to step S13, and coasting control is not executed, and normal control is executed. Is done. For example, a fuel cut that temporarily stops fuel supply to the engine 1 during traveling is executed.
- step S13 a fuel cut that temporarily stops fuel supply to the engine 1 during traveling is executed.
- control for regenerating the electric motor and outputting a regenerative torque is executed. That is, the vehicle Ve is controlled so that a braking force by a so-called engine brake or regenerative torque of the electric motor is applied to the vehicle Ve. If coasting control has already been performed, the coasting control is terminated.
- the clutch mechanism 7 that has been released to perform coasting control is engaged, and power transmission between the engine 1 and the drive wheels 2 is enabled. At the same time, normal control such as fuel cut and regenerative control of the electric motor is performed. Thereafter, this routine is once terminated.
- step S12 determines whether or not the brake operation is continued for a time before the coasting control is stopped. Is judged. Specifically, first, a first operation time T1 for determining the end of coasting control and a time for determining a timing immediately before the end of coasting control, and a first operation time for determining the start of standby control described later. Two operation times T2 are set. In this case, the first operation time T1 is for estimating and judging the degree of the driver's request for deceleration or the intention of braking.
- the second operation time T2 is set to be shorter than the first operation time T1.
- the first operation time T1 and the second operation time T2 can be set in advance based on results of experiments, simulations, and the like. For example, a time of about 2 seconds is set as the first operation time T1. In this case, the second operation time T2 is set to a time of about 1.5 seconds obtained by shortening the first operation time T1 by about 0.5 seconds.
- step S14 it is determined whether or not the brake operation has been continued for the second operation time T2 or more.
- the control in step S14 is a control that estimates and determines the probability that the driver's deceleration request is strong. Specifically, when the brake operation by the driver is continued for the second operation time T2 or more, it is estimated that there is a high probability that the driver's deceleration request becomes strong. That is, when the brake operation is continued for the second operation time T2 or longer, a braking force obtained by executing normal control such as fuel cut or regenerative control of the electric motor, that is, a braking force by so-called engine braking is required. It is estimated that the probability is high. When the brake operation by the driver is not continued for the second operation time T2 or more, it is estimated that the probability that the driver's deceleration request is strong is still low.
- step S14 If it is determined that the brake operation has not been continued for the second operation time T2 or more, that is, the probability that the driver's deceleration request is still strong is low, a negative determination is made in step S14. Proceed to S15. And it controls so that the rotation speed of the engine 1 becomes idling rotation speed. At the same time, the control pressure of the clutch mechanism 7 is turned “OFF”. That is, the control pressure of the clutch mechanism 7 is made zero. In short, in this case, the accelerator operation amount is returned to the predetermined operation amount A or less and the coasting control execution condition is satisfied, but the brake operation is not yet performed or the operation time of the brake operation is not yet This is a state in which the first operation time T1 and the second operation time T2 are not satisfied. Therefore, the clutch mechanism 7 is released and coasting control is executed. That is, the coasting control being executed is continued. Alternatively, coasting control is started. Thereafter, this routine is once terminated.
- step S16 when it is determined affirmatively in step S14 that the brake operation has been continued for the second operation time T2 or more, that is, it is estimated that there is a high probability that the driver's deceleration request becomes strong. Advances to step S16.
- the scene in which the control in step S16 is executed is a stage in which the control in step S15 described above is already executed until the brake operation is continued for the second operation time T2 or more. That is, the coasting control has already been executed. Therefore, in this step S16, standby control for ending the running coasting control is executed.
- the standby control is a control that is preliminarily executed in order to smoothly complete the coasting control. Specifically, this is control for reducing the difference in rotational speed between the rotating member on the engine 1 side and the rotating member on the drive wheel 2 side in the clutch mechanism 7.
- this is control for reducing the difference in rotational speed between the rotating member on the engine 1 side and the rotating member on the drive wheel 2 side in the clutch mechanism 7.
- the control pressure for hydraulically controlling the engaged state and the released state of the clutch mechanism 7 is increased to the standby pressure.
- the standby pressure is a hydraulic pressure for increasing and maintaining a control pressure required for engaging the clutch mechanism 7 in advance to a predetermined hydraulic pressure level.
- the standby pressure is set as high as possible within a range where the clutch mechanism 7 is not yet engaged.
- the rotational speed of the engine 1 is The input shaft speed of the automatic transmission 3 can be approached. Further, the control pressure of the clutch mechanism 7 is increased to a predetermined hydraulic pressure level. That is, standby control for smoothly ending coasting control is executed. Then, at time t12 when the first operation time T1 has elapsed, the coasting control flag is set to “OFF”. Accordingly, the control pressure of the clutch mechanism 7 is further increased, and the clutch mechanism 7 is engaged. That is, coasting control is terminated and the normal control state is restored.
- the vehicle Ve enters a state in which a so-called engine brake is applied, and is braked by both braking forces of a braking device provided by the wheels and a braking force of a so-called engine brake. Thereafter, even when the operation amount of the brake operation is returned to 0 and the braking by the braking device is released, the state where the engine brake is applied as described above is continued. As a result, an increase in vehicle speed is suppressed. Alternatively, the vehicle speed is reduced. Thereafter, this routine is once terminated.
- the coasting control can be completed promptly and smoothly by performing the standby control as described above prior to the termination of the coasting control. . That is, by reducing in advance the rotational speed difference between the rotating members of the clutch mechanism 7, it is possible to prevent or suppress an engagement shock when the clutch mechanism 7 is engaged in order to end coasting control. Further, since the control pressure supplied to engage the clutch mechanism 7 has been increased to a predetermined hydraulic pressure level in advance, the clutch mechanism 7 can be quickly engaged.
- the standby control is executed as described above, the routine is once terminated. After this standby control is executed, for example, coasting control is executed and terminated in another control routine as shown in the first control example described above.
- step S14 in the flowchart of FIG. 5, that is, the control that estimates and determines the probability that the driver's deceleration request is strong is the following other control examples. It can also be executed as follows. For example, in step S14, it is determined whether or not the brake operation by the driver has been performed for the second operation amount B2 or more. For example, when the amount of brake operation by the driver, such as the amount of depression of the brake pedal and the angle of depression, becomes equal to or greater than the second operation amount B2, it is estimated that the driver's deceleration request is likely to be strong.
- the amount of brake operation by the driver such as the amount of depression of the brake pedal and the angle of depression
- step S14 When the brake operation amount by the driver is less than the second operation amount B2, it is estimated that the probability that the driver's deceleration request becomes strong is weak. If it is determined negative in step S14 because the brake operation of the second operation amount B2 or more has not yet been performed, the process proceeds to step S15, and coasting control is executed as before. That is, coasting control is started or ongoing coasting control is continued. If a positive determination is made in step S14 because the brake operation of the second operation amount B2 or more has been performed, the process proceeds to step S16, and the standby for ending coasting control is performed as before. Control is executed.
- the brake operation amount at time t0 when the brake operation is started is 0, and then the brake operation amount has reached the second operation amount B2.
- Standby control is executed at time t21.
- coasting control is terminated at time t22 when the brake operation amount reaches the first operation amount B1.
- a so-called engine brake is applied to the vehicle Ve. That is, when the brake operation amount reaches the second operation amount B2, it is estimated that there is a high probability that the driver's deceleration request will be strong, and therefore there is a high probability that the coasting control will be terminated most recently. Then, standby control for smoothly ending coasting control is executed based on the estimation result.
- the first operation amount B1 and the second operation amount B2 can be set in advance based on the results of experiments and simulations, for example, the first operation amount B1 is about 30% of operation. The amount is set. In this case, as the second operation amount B2, an operation amount of about 20%, which is about 10% less than the first operation amount B1, is set.
- step S14 it is determined whether or not the gradient of the travel path is a downward gradient equal to or greater than the second gradient C2.
- the gradient of the travel path is a downward gradient equal to or greater than the second gradient C2
- the probability that the driver's deceleration request becomes strong becomes high.
- the gradient of the traveling road is a downward gradient or an upward gradient less than the second gradient C2
- the probability that the driver's deceleration request becomes strong is weak.
- the probability that the driver's deceleration request becomes strong does not increase.
- step S14 when the gradient of the traveling road is a downward gradient less than the second gradient C2 or an uphill gradient, if it is determined negative in this step S14, the process proceeds to step S15, and as before, The coasting control is executed. That is, coasting control is started or ongoing coasting control is continued. Further, if the traveling road gradient is a downward gradient equal to or greater than the second gradient C2, if the determination in step S14 is affirmative, the process proceeds to step S16, and coasting control is terminated as before. Standby control is performed to make it happen.
- the standby control is executed at time t31 when the gradient of the travel path becomes a downward gradient equal to or greater than the second gradient C2.
- coasting control is terminated at time t32 when the gradient of the travel path becomes a downward gradient equal to or greater than the first gradient C1.
- a so-called engine brake is applied to the vehicle Ve. That is, it is estimated that when the slope of the traveling road becomes a downward slope equal to or higher than the second slope C2, the driver's request for deceleration is strong, and therefore the probability of terminating coasting control most recently is high.
- standby control for smoothly ending coasting control is executed based on the estimation result.
- the first gradient C1 and the second gradient C2 can be set in advance based on the results of experiments and simulations, for example, a downward gradient of about 5% is set as the first gradient C1. Is done.
- a downward gradient of about 4% is set as the second gradient C2 as the second gradient C2.
- step S14 it is determined whether or not the vehicle speed has increased by a second acceleration amount V2 or more.
- the vehicle speed increase amount is equal to or greater than the second speed increase amount V2
- the probability that the driver's deceleration request becomes strong becomes high.
- the speed increase amount of the vehicle is less than the second speed increase amount V2
- it is estimated that the probability that the driver's deceleration request becomes strong is weak.
- the probability that the driver's deceleration request becomes strong does not increase.
- step S14 If the vehicle speed increase amount is less than the second speed increase amount V2 and a negative determination is made in step S14, the process proceeds to step S15, and coasting control is executed as before. That is, coasting control is started or ongoing coasting control is continued. Further, if the speed increase amount of the vehicle is greater than or equal to the second speed increase amount V2, if the determination in step S14 is affirmative, the process proceeds to step S16 to terminate coasting control as before. Standby control is executed.
- standby control is executed at time t41 when the vehicle speed increase amount is equal to or greater than the second speed increase amount V2.
- the coasting control is terminated at time t42 when the vehicle speed increase amount is equal to or greater than the first speed increase amount V1.
- a so-called engine brake is applied to the vehicle Ve. That is, when the vehicle speed increase amount becomes equal to or greater than the second speed increase amount V2, it is estimated that there is a high probability that the driver's deceleration request becomes strong, and therefore the probability that the coasting control will be terminated most recently is high.
- standby control for smoothly ending coasting control is executed based on the estimation result.
- the first acceleration amount V1 and the second acceleration amount V2 can be set in advance based on the results of experiments, simulations, and the like.
- the first acceleration amount V1 is 5 km / An acceleration amount of about h is set.
- the second speed increase amount V2 a speed increase amount of about 3 km / h, which is about 2 km / h lower than the first gradient C1, is set.
- step S14 it is determined whether or not the inter-vehicle distance between the vehicle Ve and another vehicle traveling in front of the vehicle Ve is equal to or less than the second inter-vehicle distance L2.
- the inter-vehicle distance from the preceding vehicle is equal to or less than the second inter-vehicle distance L2
- the probability that the driver's deceleration request becomes strong becomes high.
- the inter-vehicle distance from the preceding vehicle is longer than the second inter-vehicle distance L2
- the probability that the driver's deceleration request becomes strong is weak.
- step S14 it is estimated that the probability that the driver's deceleration request becomes strong does not increase.
- step S14 if a negative determination is made in step S14, the process proceeds to step S15, and coasting control is executed as before. That is, coasting control is started or ongoing coasting control is continued. Further, if the determination is affirmative in step S14 because the inter-vehicle distance from the preceding vehicle is longer than the second inter-vehicle distance L2, the process proceeds to step S16 to end coasting control as before. Standby control is executed.
- standby control is executed at time t51 when the inter-vehicle distance from the preceding vehicle becomes equal to or less than the second inter-vehicle distance L2.
- the coasting control is terminated at time t52 when the inter-vehicle distance with the preceding vehicle becomes equal to or less than the first inter-vehicle distance L1.
- a so-called engine brake is applied to the vehicle Ve. That is, when the inter-vehicle distance from the preceding vehicle becomes equal to or less than the second inter-vehicle distance L2, it is estimated that the driver's request for deceleration is strong and therefore the probability that the coasting control will be terminated most recently is high.
- the first inter-vehicle distance L1 and the second inter-vehicle distance L2 can be set in advance based on results of experiments and simulations, respectively. Further, the first inter-vehicle distance L1 and the second inter-vehicle distance L2 can be set to change at every predetermined vehicle speed or according to the vehicle speed. For example, when traveling at a vehicle speed of 80 km / h, a distance of about 50 m is set as the first inter-vehicle distance L1. In this case, as the second inter-vehicle distance L2, a distance of about 55m, which is about 5m longer than the first inter-vehicle distance L1, is set.
- the probability that the driver's deceleration request as described above becomes strong is defined as the operation time of the brake operation, the operation of the brake operation. It can be estimated and determined based on the amount, the gradient of the traveling path, the amount of increase in vehicle speed, and the inter-vehicle distance from the preceding vehicle. Therefore, the driver's deceleration request can be accurately estimated, and standby control for engaging the clutch mechanism 7 can be executed in advance based on the estimation result. Therefore, the coasting control can be executed quickly and smoothly.
- the accelerator operation is performed.
- the clutch mechanism 7 is released and the power transmission path between the engine 1 and the drive wheels 2 is interrupted. That is, coasting control is executed and the vehicle Ve travels coastingly. Therefore, the travel distance of the vehicle Ve in a state where no load is applied to the engine 1 can be extended, and as a result, the fuel consumption of the vehicle Ve can be improved.
- the driver's deceleration request is determined based on the vehicle speed and the degree of brake operation such as the operation time and operation amount of the brake.
- the degree is estimated. For example, when the operation time of a brake operated when traveling at a medium speed range is long, or when the amount of operation of the brake operated when traveling at a medium speed range is large, It is estimated that the driver's demand for deceleration is strong. When it is determined that the driver's deceleration request is strong enough for the vehicle Ve to continue to require braking force, the clutch mechanism 7 is engaged and coasting control is terminated.
- the vehicle Ve can be appropriately decelerated in accordance with the driver's deceleration request or braking intention. As a result, the drivability of the vehicle Ve can be improved.
- the operating time of the brake operated when traveling at a medium speed range is short, or the operating amount of the brake operated when traveling at a medium speed range is small.
- coasting control is continued. That is, since the driver's request for deceleration is weak, it can be determined that it is not necessary to terminate coasting control and to generate braking force such as engine braking on the vehicle Ve, so coasting control is continued. Therefore, in this case, the fuel consumption of the vehicle Ve can be improved by continuing the state where the vehicle Ve is coasting.
- the continuation or end of the coasting control is determined in consideration of the vehicle speed when the coasting control is executed. That is, coasting control is immediately terminated when a braking operation is performed while the vehicle is traveling at a vehicle speed in a low speed range lower than the medium-high speed range.
- the brake operation when the vehicle Ve is traveling at a low vehicle speed is often a brake operation for sufficiently decelerating the vehicle Ve or stopping the vehicle Ve. Therefore, as described above, the coasting control according to the present invention can be more appropriately executed by changing the manner of execution and termination of the coasting control according to the vehicle speed.
- the control device for the vehicle Ve in addition to the estimation of the driver's deceleration request as described above, there is a probability that the deceleration request is strong or that the deceleration request is determined to be strong. Presumed. And when it is estimated that the deceleration request
- the functional means for executing step S5 corresponds to the “execution means” in the present invention.
- the functional means for executing steps S2, S4, S6, S7, S12, and S14 corresponds to the “determining means” in the present invention, and the functional means for executing steps S3 and S13 is “end” in the present invention. It corresponds to “means”.
- the functional means for executing step S16 corresponds to the “standby means” in the present invention.
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Abstract
Description
そのような、この発明における惰行制御の第1の制御例を、図2のフローチャートに示してある。このフローチャートで示されるルーチンは、所定の短時間毎に繰り返し実行される。図2において、先ず、車両Veの走行状態や操作状態に関する各種データが取得される(ステップS1)。具体的には、車輪速センサ9の検出値から車速が求められる。また、アクセルセンサ10の検出値から運転者によるアクセル操作量が求められる。また、ブレーキセンサ11の検出値から運転者によるブレーキ操作量が求められる。また、加速度センサ12の検出値あるいは傾斜角センサ13の検出値から走行路の勾配が求められる。そして、距離センサ14の検出値から前方の車両との車間距離が求められる。
この発明における惰行制御の第2の制御例を、図5のフローチャートに示してある。このフローチャートで示されるルーチンは、所定の短時間毎に繰り返し実行される。図5において、先ず、車両Veの走行状態や操作状態に関する各種データが取得される(ステップS11)。具体的には、車輪速センサ9の検出値から車速が求められる。また、アクセルセンサ10の検出値から運転者によるアクセル操作量が求められる。また、ブレーキセンサ11の検出値から運転者によるブレーキ操作量が求められる。また、加速度センサ12の検出値あるいは傾斜角センサ13の検出値から走行路の勾配が求められる。そして、距離センサ14の検出値から前方の車両との車間距離が求められる。
Claims (13)
- 駆動力源と駆動輪との間の動力伝達経路を選択的に接続または遮断するクラッチ機構を備え、走行中に前記動力伝達経路を遮断して車両を惰性走行させることが可能な車両の制御装置において、
車速を検出する手段と、
運転者によるアクセル操作を検出する手段と、
前記運転者によるブレーキ操作を検出する手段と、
走行中前記アクセル操作の操作量が所定の操作量以下に戻された場合に、前記クラッチ機構を解放して前記動力伝達経路を遮断することにより前記車両を惰性走行させる惰行制御を実行する実行手段と、
前記惰行制御の実行中に、前記車速および前記ブレーキ操作に基づいて運転者の減速要求が所定値よりも大きいか否かを判断する判断手段と、
前記減速要求が前記所定値よりも大きい場合に、前記減速要求が強いと判断し、前記クラッチ機構を係合して前記動力伝達経路を接続することにより前記惰行制御を終了させる終了手段と
を備えていることを特徴とする車両の制御装置。 - 前記判断手段は、前記車両が所定車速以上の車速で走行し、かつ前記ブレーキ操作が所定時間以上継続された場合に、前記減速要求が強いと判断する手段を含むことを特徴とする請求項1に記載の車両の制御装置。
- 前記判断手段は、前記車両が所定車速以上の車速で走行し、かつ前記ブレーキ操作の操作量が所定操作量以上になった場合に、前記減速要求が強いと判断する手段を含むことを特徴とする請求項1に記載の車両の制御装置。
- 走行路の勾配を検出する手段を更に備え、
前記判断手段は、前記車両が、所定車速以上の車速で、かつ所定勾配以上の降坂路を走行する場合に、前記減速要求が強いと判断する手段を含むことを特徴とする請求項1に記載の車両の制御装置。 - 前記車両の減速度を検出する手段を更に備え、
前記判断手段は、前記車両が所定車速以上の車速で走行し、かつ前記減速度が所定減速度以上になった場合に、前記減速要求が強いと判断する手段を含むことを特徴とする請求項1に記載の車両の制御装置。 - 前記車両とその前方を走行する他の車両との車間距離を検出する手段を更に備え、
前記判断手段は、前記車両が所定車速以上の車速で走行し、かつ前記車間距離が所定距離以下になった場合に、前記減速要求が強いと判断する手段を含むことを特徴とする請求項1に記載の車両の制御装置。 - 前記終了手段は、前記ブレーキ操作が行われた際に前記車両が前記所定車速よりも低い車速で走行している場合には、前記惰行制御を終了させる手段を含むことを特徴とする請求項2から6のいずれかに記載の車両の制御装置。
- 前記判断手段は、前記車速および前記ブレーキ操作に基づいて、前記減速要求が強いと判断される確率を推定する手段を含み、
前記確率が高いと推定された場合に、前記惰行制御の終了に先立って、前記駆動力源の回転速度を制御することにより前記クラッチ機構における前記駆動力源側の回転部材と前記駆動輪側の回転部材との間の回転速度差を低減させる待機手段を更に備えている
ことを特徴とする請求項1に記載の車両の制御装置。 - 前記判断手段は、前記車両が所定車速以上の車速で走行し、かつ前記ブレーキ操作が第1操作時間以上継続された場合に、前記減速要求が強いと判断する手段と、前記ブレーキ操作が前記第1操作時間よりも短い第2操作時間以上継続された場合に、前記確率が高いと推定する手段とを含むことを特徴とする請求項8に記載の車両の制御装置。
- 前記判断手段は、前記車両が所定車速以上の車速で走行していて、かつ前記ブレーキ操作の操作量が第1操作量以上になった場合に、前記減速要求が強いと判断する手段と、前記ブレーキ操作の操作量が前記第1操作量よりも少ない第2操作量以上になった場合に、前記確率が高いと推定する手段とを含むことを特徴とする請求項8に記載の車両の制御装置。
- 走行路の勾配を検出する手段を更に備え、
前記判断手段は、前記車両が、所定車速以上の車速で、かつ第1勾配以上の降坂路を走行する場合に、前記減速要求が強いと判断する手段と、前記車両が前記第1勾配よりも緩い第2勾配以上の降坂路を走行する場合に、前記確率が高いと推定する手段とを含む
ことを特徴とする請求項8に記載の車両の制御装置。 - 前記車速の増速量を検出する手段を更に備え、
前記判断手段は、前記車両が所定車速以上の車速で走行していて、かつ前記増速量が第1増速量以上になった場合に、前記減速要求が強いと判断する手段と、前記増速量が前記第1増速量よりも少ない第2増速量以上になった場合に、前記確率が高いと推定する手段とを含む
ことを特徴とする請求項8に記載の車両の制御装置。 - 前記車両とその前方を走行する他の車両との車間距離を検出する手段を更に備え、
前記判断手段は、前記車両が所定車速以上の車速で走行していて、かつ前記車間距離が第1車間距離以下になった場合に、前記減速要求が強いと判断する手段と、前記車間距離が前記第1車間距離よりも短い第2車間距離以下になった場合に、前記確率が高いと推定する手段とを含む
ことを特徴とする請求項8に記載の車両の制御装置。
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US14/406,748 US9540004B2 (en) | 2012-06-20 | 2012-06-20 | Vehicle control system |
EP12879592.9A EP2865914B1 (en) | 2012-06-20 | 2012-06-20 | Vehicle control device |
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JP2016118240A (ja) * | 2014-12-19 | 2016-06-30 | 三菱ふそうトラック・バス株式会社 | 車両の走行制御装置 |
JP2016118237A (ja) * | 2014-12-19 | 2016-06-30 | 三菱ふそうトラック・バス株式会社 | 車両の走行制御装置 |
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JP2016141164A (ja) * | 2015-01-29 | 2016-08-08 | トヨタ自動車株式会社 | 車両制御装置 |
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Also Published As
Publication number | Publication date |
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CN104379958B (zh) | 2018-04-24 |
JP5935886B2 (ja) | 2016-06-15 |
JPWO2013190652A1 (ja) | 2016-02-08 |
CN104379958A (zh) | 2015-02-25 |
EP2865914A4 (en) | 2016-10-12 |
US20150149058A1 (en) | 2015-05-28 |
EP2865914B1 (en) | 2020-06-10 |
US9540004B2 (en) | 2017-01-10 |
EP2865914A1 (en) | 2015-04-29 |
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