WO2010143237A1 - 車両用制御装置 - Google Patents
車両用制御装置 Download PDFInfo
- Publication number
- WO2010143237A1 WO2010143237A1 PCT/JP2009/002682 JP2009002682W WO2010143237A1 WO 2010143237 A1 WO2010143237 A1 WO 2010143237A1 JP 2009002682 W JP2009002682 W JP 2009002682W WO 2010143237 A1 WO2010143237 A1 WO 2010143237A1
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- WO
- WIPO (PCT)
- Prior art keywords
- engine
- vehicle
- accelerator opening
- fuel
- deceleration
- Prior art date
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- 239000000446 fuel Substances 0.000 claims abstract description 214
- 230000005540 biological transmission Effects 0.000 claims description 133
- 230000008859 change Effects 0.000 claims description 30
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- 230000001133 acceleration Effects 0.000 description 45
- 238000010586 diagram Methods 0.000 description 20
- 238000001514 detection method Methods 0.000 description 19
- 238000002485 combustion reaction Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000000994 depressogenic effect Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
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- 230000006870 function Effects 0.000 description 1
Images
Classifications
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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
- 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
-
- 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
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
-
- 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
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
- B60W10/11—Stepped gearings
- B60W10/115—Stepped gearings with planetary gears
-
- 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
-
- 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
- B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
- B60W2530/16—Driving resistance
-
- 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
- B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
-
- 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0616—Position of fuel or air injector
- B60W2710/0627—Fuel flow rate
-
- 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/10—Change speed gearings
- B60W2710/1005—Transmission ratio engaged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/702—Road conditions
Definitions
- the present invention relates to a vehicle control device.
- the present invention relates to a vehicle control device that controls fuel cut.
- the output of the engine is usually adjusted by adjusting the amount and mixture ratio of the air-fuel mixture supplied to the engine according to the operation of the accelerator pedal.
- the vehicle can generate the driving force required by the driver and can drive the vehicle in a desired driving state.
- Some conventional vehicle control apparatuses perform control to generate a deceleration in accordance with the operation of an accelerator pedal in order to improve the ease of driving operation.
- the output of the engine is minimized such that the accelerator operation area is, for example, an area other than a fuel cut area that is a control for stopping the supply of fuel to the engine.
- the braking force is generated in the braking device. Further, when the operation position of the accelerator pedal is closed from the operation position for performing the fuel cut, a larger deceleration is generated by performing the fuel cut.
- the vehicle deceleration control device described in Patent Document 1 since the braking force can be generated according to the operation of the accelerator pedal or the fuel cut can be performed as described above, the vehicle can generate the deceleration. There is no need to frequently change the accelerator pedal and the brake pedal during driving. Thereby, the easiness of driving operation at the time of driving
- the fuel cut may be performed as described above.
- the fuel cut is mainly performed when the fuel consumption is reduced to improve the fuel consumption.
- the fuel cutting when the accelerator pedal operating position when the accelerator pedal returning operation is being performed is more closed than the fuel cutting operating position, the fuel Cutting.
- the fuel cut is performed for the purpose of generating the deceleration. Therefore, even when the fuel cut is performed based on the operation position of the accelerator pedal as described above, the fuel cut is performed. By performing the above, the deceleration can be generated and the purpose can be achieved.
- the present invention has been made in view of the above, and an object of the present invention is to provide a vehicle control device that can improve fuel consumption more reliably.
- the vehicle control device is a vehicle control device including a power adjustment unit capable of adjusting power generated by an engine that is a power source when the vehicle travels by adjusting an operation amount.
- a power adjustment unit capable of adjusting power generated by an engine that is a power source when the vehicle travels by adjusting an operation amount.
- fuel supply stop control is performed, which is control for stopping supply of fuel used for operating the engine.
- a transmission state changing mechanism is provided that can change the transmission state when power is transmitted between the engine and the drive wheels.
- the engine and the drive wheels It is preferable to control the transmission state changing mechanism so as to reduce the transmission ratio when power is transmitted between the two.
- the fuel supply stop further includes a transmission state change mechanism capable of changing a transmission state when power is transmitted between the engine and the drive wheel, and a motor that is a power source when the vehicle travels.
- the transmission state changing mechanism is controlled so as to reduce the transmission rate when the power is transmitted between the engine and the drive wheels, and the motor is connected between the engine and the drive wheels during the fuel supply stop control.
- the fuel supply stop control is terminated and the fuel supply is completed.
- the power necessary for operating the engine independently is transmitted to the engine.
- the vehicle control device according to the present invention has an effect that fuel consumption can be improved more reliably.
- FIG. 1 is a schematic diagram of a vehicle control apparatus according to an embodiment of the present invention.
- FIG. 2 is a configuration diagram of a main part of the vehicle control device shown in FIG.
- FIG. 3 is an explanatory diagram when the deceleration and the fuel cut at the time of deceleration between the vehicle control device according to the embodiment and the conventional vehicle control device are compared.
- FIG. 4 is an explanatory diagram of a region where fuel cut is performed.
- FIG. 5 is an explanatory diagram of acceleration generated with respect to the accelerator opening.
- FIG. 6 is an explanatory diagram showing changes in deceleration when shifting is performed during deceleration.
- FIG. 7 is an explanatory diagram when the slip control of the friction engagement element is performed at the time of fuel cut.
- FIG. 1 is a schematic diagram of a vehicle control apparatus according to an embodiment of the present invention.
- FIG. 2 is a configuration diagram of a main part of the vehicle control device shown in FIG.
- FIG. 3 is an explanatory diagram
- FIG. 8 is an explanatory diagram of slip control with respect to the brake cylinder pressure when the accelerator opening is fully closed.
- FIG. 9 is a flowchart illustrating a processing procedure of the vehicle control device according to the embodiment.
- FIG. 10 is a main part configuration diagram of a modified example of the vehicle control device according to the embodiment.
- FIG. 11 is an explanatory diagram of acceleration generated with respect to the accelerator opening in the vehicle control device shown in FIG. 10.
- FIG. 1 is a schematic diagram of a vehicle control apparatus according to an embodiment of the present invention.
- the vehicle control device 2 shown in FIG. 1 is provided so as to be able to control the engine 10 provided as a power source when the vehicle 1 travels and to perform shift control of the automatic transmission 20 connected to the engine 10. ing. That is, both the engine 10 and the automatic transmission 20 are connected to an ECU (Electronic Control Unit) 60, and the ECU 60 controls the rotation speed and torque (output) of the engine 10 and the shift control of the automatic transmission 20. It is provided as possible.
- ECU Electronic Control Unit
- the engine 10 communicates with a combustion chamber (not shown) of the engine 10 and an intake passage 12 that is a passage through which air taken into the combustion chamber flows, and after burning fuel in the combustion chamber, the combustion is performed.
- An exhaust passage (not shown) through which exhaust gas discharged from the chamber flows is connected.
- the intake passage 12 includes a throttle valve 13 as an intake air amount adjusting means for adjusting the amount of air taken into the engine 10 and a fuel injector 14 as a fuel supply means for injecting fuel to be supplied to the combustion chamber. Is provided.
- the throttle valve 13 and the fuel injector 14 are both connected to the ECU 60 and are provided so as to be controllable by the ECU 60.
- the automatic transmission 20 includes a torque converter 21, a transmission device 30, and a hydraulic control device 35.
- the power generated in the engine 10 and input to the automatic transmission 20 is provided so as to be transmitted to a transmission 30 which is a gear ratio variable means via a torque converter 21, and the power of the engine 10 is transmitted to the transmission 30.
- the rotational speed is changed by the transmission 30 at a speed ratio selected according to the traveling condition of the vehicle 1, and the shifted torque is provided so as to be output to the drive wheel 48 side of the vehicle 1. .
- the torque converter 21 has a pump 22 and a turbine 23 capable of transmitting fluid of power transmitted from the engine 10. Further, the torque converter 21 includes a lockup mechanism 27 capable of mechanically transmitting power transmitted from the engine 10.
- the lockup mechanism 27 includes a cover 26 that can rotate together with the pump 22, and a transmission 30. This is constituted by a lockup clutch 28 that is rotatably provided with a transmission input shaft 31 that is an input shaft of the gear and that can be switched between engagement and disengagement with the cover 26.
- the automatic transmission 20 includes a planetary gear device that is a plurality of transmission elements, a plurality of friction engagement elements (clutch C1, clutch C2, clutch C3, clutch C4, brakes B1, B2) 40, and the like.
- the multi-stage transmission 30 is configured by combining the two.
- the brake is the friction engagement element 40 attached to the casing of the transmission 30, and the clutch is not the casing of the transmission 30 but the friction engagement element 40 attached to the rotating shaft.
- the number of transmission elements and friction engagement elements 40 included in the transmission device 30 may be changed as appropriate according to the specifications of the automatic transmission 20.
- the hydraulic control device 35 includes a linear solenoid valve 36 as a friction engagement element hydraulic pressure adjusting means for adjusting the hydraulic pressure of the control oil supplied to each friction engagement element 40.
- the hydraulic control device 35 is provided so as to be able to generate a hydraulic pressure for operating each friction engagement element 40, distributes the generated hydraulic pressure to a predetermined friction engagement element 40, and distributes the generated hydraulic pressure to the friction engagement element 40. It also has a function of adjusting the hydraulic pressure of the supplied control oil.
- the automatic transmission 20 includes a pump (not shown) that is connected to the linear solenoid valve 36 and supplies control oil stored in the automatic transmission 20 to the linear solenoid valve 36.
- the transmission 30 stops the rotating elements (carriers and ring gears) of the planetary gear device, which is a transmission element, by brakes B1, B2, and the like, which are friction engagement elements 40, and receives the power of the engine 10
- the gear ratio can be changed by switching the rotation element of the device 30 with the clutches C1, C2, C3, C4, etc., which are the friction engagement elements 40.
- the gear position can be changed by changing the combination of rotating elements to be stopped. That is, each combination of rotation and stop of the rotating elements is set as a shift stage of the automatic transmission 20, and the automatic transmission 20 can change the rotational speed of the power transmitted from the engine 10.
- the transmission 30 also has a transmission output shaft 32 that is an output shaft of the transmission 30, and the transmission output shaft 32 is connected to the propeller shaft 45 of the vehicle 1. That is, the transmission output shaft 32 is an output shaft of the automatic transmission 20.
- the propeller shaft 45 is connected to a differential device 46, and the differential device 46 is connected to a drive wheel 48 of the vehicle 1 via a drive shaft 47. For this reason, the power of the engine 10 transmitted to the automatic transmission 20 is provided so as to be transmitted to the drive wheels 48 via the differential 46 and the drive shaft 47.
- the engine 10 is provided with an engine speed sensor 15 which is an engine speed detecting means capable of detecting the speed of the engine output shaft 11.
- the automatic transmission 20 includes the transmission input shaft rotational speed sensor 41 which is a transmission input shaft rotational speed detection means capable of detecting the rotational speed of the transmission input shaft 31 and the rotational speed of the transmission output shaft 32.
- a transmission output shaft rotational speed sensor 42 which is a transmission output shaft rotational speed detection means capable of detection is provided.
- the driver's seat of the vehicle 1 is provided with an accelerator pedal 50 that is a power adjustment unit that can adjust the power generated by the engine 10 by adjusting the accelerator opening that is the operation amount.
- an accelerator opening sensor 51 which is a power adjustment unit operation amount detection means capable of detecting the accelerator opening.
- the accelerator opening sensor 51 is also connected to the ECU 60.
- the ECU 60 is connected to an acceleration sensor 55 that is an acceleration detecting means for detecting the acceleration of the vehicle 1 that is running.
- FIG. 2 is a block diagram of the main part of the vehicle control device shown in FIG.
- the ECU 60 is provided with a processing unit 61, a storage unit 80, and an input / output unit 81, which are connected to each other and can exchange signals with each other. Further, the throttle valve 13, the fuel injector 14, the engine speed sensor 15, the linear solenoid valve 36, the transmission input shaft speed sensor 41, the transmission output shaft speed sensor 42, and the accelerator opening sensor 51 connected to the ECU 60.
- the acceleration sensor 55 is connected to an input / output unit 81, and the input / output unit 81 inputs and outputs signals to and from the engine speed sensor 15 and the like.
- the storage unit 80 stores a computer program for controlling the vehicle control device 2.
- the processing unit 61 includes a memory and a CPU (Central Processing Unit), and at least an accelerator opening that can acquire an accelerator opening degree that is an opening degree of the accelerator pedal 50 from a detection result of the accelerator opening sensor 51.
- An accelerator opening degree obtaining unit 62 that is a degree obtaining unit
- an engine revolution number obtaining unit 63 that is an engine revolution number obtaining unit that obtains an engine revolution number from a detection result of the engine revolution number sensor 15, and a transmission output shaft revolution number.
- a vehicle speed acquisition unit 64 that is a vehicle speed acquisition unit that acquires the vehicle speed from the detection result of the sensor 42, an acceleration acquisition unit 65 that is an acceleration acquisition unit of acquiring the acceleration of the vehicle 1 from the detection result of the acceleration sensor 55, and an accelerator opening
- It has a gradient estimation unit 66 is the slope estimating means constant for, a.
- the processing unit 61 is an idle state determination unit that determines whether or not the accelerator pedal 50 is in an idle-off state, which is a state other than a fully closed state, based on the accelerator opening acquired by the accelerator opening acquisition unit 62.
- a deceleration determination unit 68 that is a deceleration determination unit that determines whether or not the vehicle 1 is decelerating, and an estimation by the gradient estimation unit 66
- a gradient determination unit 69 that is a gradient determination unit that determines whether or not the traveling road is an uphill, and an accelerator pedal that is acquired by the accelerator opening acquisition unit 62
- the accelerator opening state determination unit 70 that is a power adjustment unit operation amount state determination unit that determines the state of change in the accelerator opening that is an operation amount of 50, and a condition that is a condition for executing fuel cut. Erukatto condition has a fuel cut condition establishment determining unit 71 is a fuel cut condition
- the processing unit 61 controls the engine control unit 72 that is an internal combustion engine control unit that controls the operation of the engine 10 and the hydraulic pressure applied to the friction engagement element 40 of the automatic transmission 20 to control the automatic transmission 20.
- a shift control unit 73 which is a hydraulic control means provided so as to be capable of shift control.
- the control of the vehicle control device 2 controlled by the ECU 60 is performed by, for example, the processor 61 reading the computer program into a memory incorporated in the processor 61 based on the detection result of the accelerator opening sensor 51 and the like. Then, control is performed by operating the linear solenoid valve 36 or the like in accordance with the calculation result. At that time, the processing unit 61 appropriately stores a numerical value in the middle of the calculation in the storage unit 80, and takes out the stored numerical value and executes the calculation. In addition, when controlling the control apparatus 2 for vehicles in this way, you may control by the dedicated hardware different from ECU60 instead of the said computer program.
- the vehicle control device 2 is configured as described above, and the operation thereof will be described below. While the vehicle 1 is traveling, the stroke amount of the accelerator pedal 50 or the accelerator opening is detected by an accelerator opening sensor 51 provided in the vicinity of the accelerator pedal 50. The detection result by the accelerator opening sensor 51 is transmitted to the accelerator opening acquiring unit 62 included in the processing unit 61 of the ECU 60 and acquired by the accelerator opening acquiring unit 62. The accelerator opening acquired by the accelerator opening acquiring unit 62 is transmitted to the engine control unit 72 included in the processing unit 61 of the ECU 60, and the engine control unit 72 receives the detected accelerator opening and other sensor detection results. Based on this, the engine 10 is controlled.
- the engine control unit 72 controls the opening degree of the throttle valve 13 based on the accelerator opening degree obtained by the accelerator opening degree obtaining unit 62, or controls the injection amount of fuel injected from the fuel injector 14. To do. As a result, the engine control unit 72 adjusts the amount and mixture ratio of the air-fuel mixture sucked into the combustion chamber of the engine 10 based on the accelerator opening and the like, and causes the engine 10 to generate the power required by the driver.
- the power of the engine 10 controlled by the engine control unit 72 is output to the outside as the engine output shaft 11 rotates.
- the rotation of the engine output shaft 11 is first transmitted to the torque converter 21, and the torque converter 21 rotates and is transmitted to the transmission input shaft 31 via the torque converter 21.
- the rotation of the engine output shaft 11 transmitted to the transmission input shaft 31 via the torque converter 21 is transmitted to the transmission 30 by the transmission input shaft 31. Thereby, the power of the engine 10 is input to the transmission 30.
- the motive power of the engine 10 input from the transmission input shaft 31 to the transmission 30 via the torque converter 21 is changed in the number of rotations and the magnitude of the torque by the transmission element of the transmission 30.
- 30 is output from a transmission output shaft 32 of 30. Since the transmission output shaft 32 is connected to the propeller shaft 45 of the vehicle 1, the output from the transmission 30 is disposed between the propeller shaft 45 and other parts between the automatic transmission 20 and the drive wheels 48. It is transmitted to the drive wheels 48 of the vehicle 1 through power transmission means such as a differential device 46. As a result, the drive wheels 48 rotate and the vehicle 1 travels.
- the shift control unit 73 included in the processing unit 61 of the ECU 60 controls the automatic transmission 20 and performs shift control according to the traveling state of the vehicle 1. Specifically, when the vehicle 1 travels, the engine speed sensor 15 detects the speed of the engine output shaft 11, and the detection result is transmitted to the engine speed acquisition unit 63 included in the processing unit 61 of the ECU 60. Obtained by the obtaining unit 63.
- the transmission output shaft rotational speed sensor 42 detects the rotational speed of the transmission output shaft 32. Since the transmission gear output shaft 32 and the drive wheel 48 have a constant gear ratio, the rotational speed of the drive wheel 48 can be estimated by detecting the rotational speed of the transmission gear output shaft 32. The vehicle speed can be estimated.
- the transmission output shaft rotational speed sensor 42 is provided as a vehicle speed detection means capable of detecting the vehicle speed by detecting the rotational speed of the transmission output shaft 32.
- the rotational speed of the transmission output shaft 32 detected by the transmission output shaft rotational speed sensor 42 is transmitted to the vehicle speed acquisition unit 64 included in the processing unit 61 of the ECU 60, and the vehicle speed acquisition unit 64 performs a predetermined calculation. Get as vehicle speed.
- the shift control unit 73 operates the linear solenoid valve 36 in accordance with the accelerator opening acquired by the accelerator opening acquisition unit 62, the engine speed acquired by the engine speed acquisition unit 63, the vehicle speed acquired by the vehicle speed acquisition unit 64, and the like.
- the friction engagement element 40 such as the clutch C1
- the gear ratio is changed, Change the gear position.
- the engine control unit 72 included in the processing unit 61 of the ECU 60 transmits a control signal for stopping the fuel injection to the fuel injector 14.
- the fuel injector 14 stops the fuel injection and enters a fuel cut state that is a fuel supply stop control that is a control for stopping the supply of fuel used to operate the engine 10.
- a fuel cut state that is a fuel supply stop control that is a control for stopping the supply of fuel used to operate the engine 10.
- the engine output shaft 11 is rotated by a force due to inertia during the traveling, and operates during operation of the engine 10 such as an intake / exhaust valve (not shown). The part is also activated by this force.
- the fuel cut is performed in this way.
- the condition is that the operation amount of the accelerator pedal 50 is 0, that is, the accelerator opening is fully closed, and Even when the engine speed is equal to or higher than the predetermined speed, or when the accelerator opening is other than fully closed, the vehicle 1 is decelerating and the road on which the vehicle is running is not an uphill and the accelerator pedal 50 does not increase. , Fuel cut.
- the accelerator opening when the accelerator opening is in a fully closed state, it indicates that the driver does not request driving force. Further, the engine control unit 72 maintains the operation state of the engine 10 while the vehicle 1 is traveling, so that the driver does not request power from the engine 10, and the inertial force during the traveling of the vehicle 1 is not generated. Even when the engine 10 is not transmitted, in order to maintain the operation at a predetermined low speed, the opening of the throttle valve 13 is controlled so that the amount of air necessary for the operation can be sucked, and the fuel required for the operation Is injected into the fuel injector 14.
- the engine 10 operates with this air and fuel, even when the driver does not request power and the force due to inertia is not transmitted to the engine 10, and idling, which is the operation at a predetermined low speed. Do. In this way, even when the accelerator opening is in the fully closed state, if the engine speed is a low speed equal to or lower than the predetermined rotation, it is necessary to inject fuel for idling. In the closed state, the fuel cut is performed when the engine speed is equal to or higher than a predetermined speed.
- the fuel cut control is performed by the engine control unit 72 included in the processing unit 61 of the ECU 60.
- the engine control unit 72 that performs the fuel cut control in this way is a case where the accelerator opening is other than the fully closed state, and When the vehicle 1 is decelerated, it is provided as a deceleration control means for performing fuel cut.
- FIG. 3 is an explanatory diagram in the case where the deceleration and the fuel cut at the time of deceleration between the vehicle control device according to the embodiment and the conventional vehicle control device are compared.
- the conventional vehicle control device as shown in the conventional fuel cut state FCp in FIG. 3, even when the vehicle speed is decreased or the accelerator opening AO is started to be closed, the accelerator opening AO is fully closed. Does not cut the fuel. In other words, the conventional vehicle control device performs fuel cut when the accelerator opening AO is fully closed.
- the vehicle speed in FIG. 3 is the vehicle speed when the deceleration control is performed by the conventional vehicle control device and the vehicle speed when the deceleration control is performed by the vehicle control device 2 according to the embodiment.
- the vehicle control device 2 according to the embodiment decelerates in a state in which the deceleration is larger than when the deceleration control is performed by the conventional vehicle control device. That is, the vehicle control device 2 according to the embodiment decelerates faster than the case where the conventional vehicle control device performs the deceleration control.
- FIG. 4 is an explanatory diagram of a region where fuel cut is performed.
- the vehicle control device 2 even when the accelerator opening is not fully closed, the fuel cut is performed when the vehicle 1 is decelerating.
- the accelerator opening and the change in the speed of the vehicle 1 will be described. Since the power generated in the engine 10 can be adjusted by adjusting the accelerator opening, the vehicle speed is mainly determined by the accelerator opening. It increases as it increases, and decreases as the accelerator opening decreases. That is, the vehicle 1 accelerates when the accelerator opening is increased, and decelerates when the accelerator opening is decreased. The vehicle speed is accelerated or decelerated by changing the accelerator opening in this way, but the boundary is the driving force generated by the accelerator opening and the road load that is the running resistance when the vehicle 1 is traveling. The opening is balanced.
- the driving force of the vehicle 1 changes according to the power of the engine 10, the speed of the automatic transmission 20, and the vehicle speed by adjusting the accelerator opening to adjust the power of the engine 10.
- the acceleration of 1 changes depending on the relationship between the driving force and the road load that change in this way. Specifically, the acceleration increases when the driving force greatly exceeds the road load, and the acceleration decreases when the degree of the driving force relative to the road load is small. Further, when the driving force is lower than the road load, the driving force is lost to the road load, so the vehicle 1 does not accelerate in the traveling direction but decelerates. Thus, the vehicle 1 accelerates when the driving force exceeds the road load, and decelerates when the driving force falls below the road load.
- the fuel cut area FCA which is an operation area where fuel cut is performed, is an area where the driving force when the vehicle 1 travels is equal to or less than the road load RL.
- the road load RL is a running resistance including an air resistance when the vehicle 1 is running, and therefore increases as the vehicle speed increases.
- the fuel cut area FCA which is an area where the driving force becomes equal to or less than the road load RL, easily becomes the fuel cut area FCA with a small driving force as the vehicle speed increases.
- the fuel cut area FCA is an area that is set based on the relationship between the driving force and the road load RL as described above.
- the fuel cut area FCA since the driving force changes according to the accelerator opening, in other words, the fuel cut area FCA. Is an operating region in which the accelerator opening is an opening at which the driving force is smaller than that of the load RL.
- the accelerator opening that serves as a reference for determining whether or not to perform fuel cut that is, the accelerator opening for enabling fuel cut, generates a driving force that balances at least the road load RL estimated according to the vehicle speed. It becomes the accelerator opening which can be made to.
- FIG. 5 is an explanatory diagram of acceleration generated with respect to the accelerator opening.
- the vehicle control device 2 according to the embodiment performs fuel cut at the time of deceleration even when the accelerator opening is other than fully closed. However, when fuel cut is performed, fuel is not burned in the combustion chamber, so that no power is generated. No longer. As a result, a so-called engine brake, which is a deceleration force generated by the rotational resistance of the engine 10, becomes larger than when fuel cut is not performed. For this reason, in the vehicle control device 2 according to the embodiment, when the fuel cut is performed when the accelerator opening is not fully closed, the engine 10 and the drive wheels are controlled by the shift control unit 73 included in the processing unit 61 of the ECU 60.
- the friction engagement element 40 included in the transmission 30 and the lockup mechanism 27 included in the torque converter 21 transmit power between the engine 10 and the drive wheels 48 by causing slippage when transmitting power. It is provided as a transmission state change mechanism capable of changing the transmission state when the operation is performed.
- the transmission control unit 73 is provided so as to be able to control a transmission state changing mechanism such as the friction engagement element 40 and the like, and when the engine control unit 72 performs fuel cut, the engine 10 and the drive wheels 48 It is provided as a transmission state control means for controlling the frictional engagement element 40 and the like so as to reduce the transmission ratio when power is transmitted between them.
- the acceleration AC increases as the accelerator opening increases, and the acceleration AC decreases as the accelerator opening decreases. Further, when the accelerator opening becomes smaller than the accelerator opening that can generate the driving force that balances with the road load RL, the acceleration in the forward direction of the vehicle 1 becomes negative and deceleration occurs. .
- the degree of change in deceleration relative to the change in accelerator opening is the change in accelerator opening.
- the acceleration AC changes with the same degree as the degree of change of the acceleration AC.
- the degree of change in the conventional deceleration DEp which is the deceleration with respect to the change in the accelerator opening, is the same as the degree of change in the acceleration AC with respect to the change in the accelerator opening.
- the vehicle control apparatus 2 according to the embodiment, as shown by the embodiment deceleration DEe in FIG. 5, the accelerator opening is larger than the accelerator opening that can generate a driving force balanced with the road load. If the accelerator opening is smaller, the deceleration suddenly increases when the accelerator opening is less than the accelerator opening that balances the road load from the accelerator opening larger than the road load.
- the deceleration increases rapidly as shown by the fuel-cut deceleration DEf in FIG. 5, but the vehicle control device 2 according to the embodiment. Then, when fuel cut is performed at the time of deceleration when the accelerator pedal 50 is in a state other than the fully closed state, a slip is generated in the friction engagement element 40 and the like, so that the rate at which the engine brake is transmitted to the drive wheels 48 decreases. For this reason, as shown by the example deceleration DEe, the deceleration is smaller than the fuel-cut deceleration DEf and larger than the conventional deceleration DEp as the accelerator opening decreases. In the state, the deceleration increases.
- a part of the engine speed is transmitted to the drive wheel 48 by this engagement, so that a deceleration DEs corresponding to the secured engine speed is generated.
- the self-sustained operation of the engine 10 means that the crankshaft (not shown) does not rotate due to the inertia when the vehicle 1 travels, but the piston ( The operation parts such as (not shown) are operated, and the crankshaft continuously rotates.
- FIG. 6 is an explanatory diagram showing changes in deceleration when shifting is performed during deceleration.
- the deceleration DEs corresponding to the secured engine speed is generated in this way, and in this case, the friction engagement element 40 or the like is generated.
- the embodiment deceleration DEe is greater than the fuel-cut deceleration DEf, which is a deceleration when the slip is not generated in the friction engagement element 40 or the like after the deceleration DEs corresponding to the engine speed is secured.
- the deceleration becomes smaller.
- the shift control unit 73 shifts the automatic transmission 20 based on the relationship between the vehicle speed and the accelerator opening. That is, the shift timing based on the relationship between the accelerator opening and the vehicle speed is preset and stored in the storage unit 80 of the ECU 60 as shown by the shift line CSL in FIG.
- the automatic transmission 20 is controlled according to the accelerator opening degree acquired by the opening degree acquisition unit 62 and the vehicle speed acquired by the vehicle speed acquisition unit 64 to perform a shift.
- the vehicle speed decreases and the engine speed also decreases, and when the engine speed falls below a predetermined speed, the gear shifts to the low speed side, but the engine speed decreases.
- the engine brake is weakened. For this reason, when the engine speed acquired by the engine speed acquisition unit 63 falls below a predetermined speed, the shift control unit 73 ends the slip of the friction engagement element 40 and the like, and is completely engaged. Let When the engine speed is decreased, the engine brake is decreased. Therefore, even when the friction engagement element 40 or the like is engaged in this manner, the deceleration force is weakened.
- the shift control unit 73 performs shift control based on a preset shift line CSL. That is, when the driving state such as the vehicle speed and the engine speed becomes the driving state in which the downshift is executed, the downshift is executed, and the shift stage of the automatic transmission 20 is shifted to the low speed side. As described above, when the speed is shifted to the low speed side at the downshift execution time Tds, the engine speed increases, so that the engine brake becomes large.
- the shift control unit 73 generates a deceleration DEs corresponding to the engine rotation speed securing, and then generates a slip in the friction engagement element 40 and the like, so that the example deceleration DEe is set to be greater than the fuel cut deceleration DEf. Make small deceleration.
- a downshift is performed to increase the engine speed, so that the engine 10 can operate independently when the engine speed returns from the fuel cut.
- the fuel supply return rotation speed that is, the fuel cut return rotation speed is suppressed to be equal to or less than the fuel cut return rotation speed.
- FIG. 7 is an explanatory diagram when the slip control of the friction engagement element is performed at the time of fuel cut.
- the fuel cut is performed at the time of deceleration when the accelerator pedal 50 is in a state other than the fully closed state, the deceleration is adjusted by causing the friction engagement element 40 or the like to slip in this way.
- slip control that is control when slip is generated in the friction engagement element 40 of the automatic transmission 20 will be described.
- the engine torque transmitted to the drive wheels 48 also changes.
- the accelerator opening is changed by a conventional vehicle control device, the engine torque is the same as that of the conventional engine shown in FIG.
- the torque Tep the accelerator opening decreases as the accelerator opening decreases.
- the engine torque is not only transmitted to the drive wheels 48 when the engine 10 is generating power, but also from the engine 10 to the drive wheels 48 as torque in the deceleration direction of the vehicle 1 when the engine brake is generated.
- the torque transmitted to is also included.
- the embodiment engine torque Tee that is the engine torque in this case is as shown in FIG.
- the accelerator opening that is changed in the direction in which the opening becomes smaller becomes equal to or less than the load load opening AOr that is the opening that balances with the road load
- the opening decreases rapidly.
- the shift control unit 73 loads the hydraulic pressure applied to the friction engagement element 40 by the hydraulic control device 35 that controls the engagement and release of the friction engagement element 40 and the linear solenoid valve 36. When it becomes less than the opening, it is rapidly reduced. As a result, the slip amount of the friction engagement element 40 increases rapidly, and the friction engagement element 40 in the engaged state is slipped in a short time.
- the transmission control unit 73 sharply decreases the hydraulic pressure applied to the friction engagement element 40 and raises the hydraulic pressure after the friction engagement element 40 is slipped in a short time. As a result, the slip amount decreases and the friction engagement element 40 changes in the engagement direction. When the slip amount becomes zero, the friction engagement element 40 is finally reengaged.
- FIG. 8 is an explanatory diagram of the slip control with respect to the brake cylinder pressure when the accelerator opening is fully closed.
- the slip control of the friction engagement element 40 and the like is performed at the time of fuel cut.
- the driver of the vehicle 1 has a large intention to decelerate
- the deceleration direction generated by the powerful engine brake generated by performing the fuel cut without causing the friction engagement element 40 or the like to slip during the fuel cut. Is transmitted to the drive wheel 48 as it is.
- the ratio of the negative torque transmitted to the drive wheels 48 is reduced by increasing the slip generated in the friction engagement element 40 or the like.
- the driver's intention to decelerate in this case is determined by, for example, a known braking device (not shown) when the driver operates a deceleration pedal of the vehicle 1 or a brake pedal (not shown) attached to the accelerator pedal 50.
- the determination is based on the brake cylinder pressure, which is the pressure generated in the master cylinder (not shown).
- the brake cylinder pressure is the pressure generated in the master cylinder (not shown).
- the shift control unit 73 performs slip control of the friction engagement element 40 and the like so that the torque in the deceleration direction is increased.
- the slip at the friction engagement element 40 or the like is minimized or the slip is set to 0, and the driving wheel is driven from the engine 10.
- the negative torque transmitted to 48 is maximized.
- the negative torque transmitted from the engine 10 to the drive wheels 48 is negative transmitted from the engine 10 to the drive wheels 48 when the conventional vehicle control device performs fuel cut when the accelerator opening is fully closed. It becomes the same level as the conventional negative torque Tnp which is a torque.
- the negative torque transmitted from the engine 10 to the drive wheel 48 is not only high in brake cylinder pressure but also low.
- the torque is constantly the same magnitude, and the conventional negative torque is constant regardless of the magnitude of the brake cylinder pressure.
- the vehicle control device 2 As the brake cylinder pressure decreases, the ratio of slip generated by the friction engagement element 40 and the like is increased. For this reason, since the ratio of the negative torque transmitted from the engine 10 to the drive wheel 48 is reduced, the example negative torque Tne becomes smaller as the brake cylinder pressure becomes smaller.
- the slip control of the friction engagement element 40 and the like is performed so that the negative torque transmitted to the drive wheel 48 increases as the brake cylinder pressure increases.
- the slip control may be performed based on other than the brake cylinder pressure.
- the slip control of the friction engagement element 40 and the like is performed by changing the transmission state when the power is transmitted between the engine 10 and the drive wheel 48 according to the requested deceleration when the driver requests deceleration.
- the power transmission capacity may be changed in accordance with the required deceleration.
- FIG. 9 is a flowchart illustrating a processing procedure of the vehicle control device according to the embodiment.
- a control method of the vehicle control device 2 according to the embodiment that is, a processing procedure of the vehicle control device 2 will be described.
- the following processing is called and executed every predetermined period when each unit is controlled during operation of the vehicle 1.
- traveling state information is acquired (step ST101).
- the traveling state in this case, the accelerator opening, the opening of the throttle valve 13, the water temperature, the engine speed, the vehicle speed, the acceleration during traveling, and the like are acquired.
- the accelerator opening is detected by the accelerator opening sensor 51, and the accelerator opening 50 of the accelerator pedal 50 is detected by the accelerator opening sensor 51.
- the engine speed is detected by the engine speed sensor 15 per unit time of the engine output shaft 11, and the detection result is detected by the engine speed acquisition unit 63 of the processing unit 61 of the ECU 60.
- the vehicle speed is detected by the vehicle speed acquisition unit 64 included in the processing unit 61 of the ECU 60 by detecting the rotation speed of the transmission output shaft 32 by the transmission output shaft rotation speed sensor 42 and the detection result is acquired by the vehicle speed acquisition unit 64.
- the vehicle speed is obtained by performing a predetermined calculation in step (b).
- the acceleration at the time of traveling is detected by the acceleration sensor 55 when the vehicle 1 is traveling, and the detection result is acquired by the acceleration acquisition unit 65 of the processing unit 61 of the ECU 60.
- step ST102 it is determined whether or not it is in an idle-off state.
- This determination is performed by the idle state determination unit 67 included in the processing unit 61 of the ECU 60 based on the accelerator opening acquired by the accelerator opening acquisition unit 62.
- the idle state determination unit 67 determines that the engine is in the idle-on state because one condition for performing the idle control of the engine 10 is satisfied.
- the accelerator opening acquired by the accelerator opening acquiring unit 62 is other than fully closed, the engine 10 is not subjected to idle control, and therefore, it is determined that the engine is in an idle-off state where idle control is not performed. If it is determined by the idle state determination unit 67 that the idle state is not the off state, the process proceeds to step ST106 described later.
- step ST102 when it is determined by the determination in the idle state determination unit 67 (step ST102) that the vehicle is in the idle off state, it is next determined whether or not the vehicle 1 is decelerating (step ST103). ).
- This determination is performed by the deceleration determination unit 68 included in the processing unit 61 of the ECU 60.
- the deceleration determination unit 68 acquires the vehicle speed acquired by the vehicle speed acquisition unit 64 continuously or every predetermined short time, and determines whether the vehicle 1 is decelerating based on the acquired rate of change of the vehicle speed. judge. That is, the deceleration determination unit 68 determines that the vehicle 1 is decelerating when the acquired vehicle speed is decreasing, and the vehicle 1 is decelerating when the acquired vehicle speed is constant or increasing.
- the processing procedure is exited.
- the determination as to whether or not the vehicle 1 is decelerating may determine whether or not the vehicle 1 is decelerating based on other than the rate of change in vehicle speed. For example, detection by the acceleration sensor 55 Based on the result, it may be determined whether the vehicle 1 is decelerating.
- Step ST104 This determination is performed by the gradient determination unit 69 included in the processing unit 61 of the ECU 60.
- the gradient estimation unit 66 included in the processing unit 61 of the ECU 60 estimates the gradient of the traveling road.
- the accelerator opening acquired by the accelerator opening acquisition unit 62 the vehicle speed acquired by the vehicle speed acquisition unit 64, and the engine acquired by the engine speed acquisition unit 63.
- the acceleration when the vehicle is traveling on a flat road with a gradient of 0 degrees is estimated.
- the gradient estimation unit 66 compares the acceleration estimated in this way with the acceleration acquired by the acceleration acquisition unit 65, that is, the actual acceleration, and estimates the road gradient based on the difference.
- the acceleration acquired by the acceleration acquisition unit 65 when the acceleration acquired by the acceleration acquisition unit 65 is larger than the acceleration estimated from the accelerator opening etc., it indicates that the vehicle 1 is accelerating more than the driving force generated by the accelerator opening etc. Therefore, in this case, it is estimated that the road has a gradient in a downward direction as the vehicle 1 moves forward.
- the acceleration acquired by the acceleration acquisition unit 65 is smaller than the acceleration estimated from the accelerator opening etc., the vehicle 1 is accelerating below the driving force generated by the accelerator opening etc. In this case, it is estimated that the road has a gradient in the upward direction as the vehicle 1 moves forward.
- the gradient determination unit 69 determines whether the gradient estimated by the gradient estimation unit 66 is a gradient in a direction in which the vehicle 1 moves upward as the vehicle 1 moves forward, and the traveling road is an uphill. It is determined whether or not. If it is determined by the gradient determination unit 69 that the traveling road is an uphill, the process is exited.
- the slope of the road may be estimated from a result other than the detection result of the acceleration sensor 55.
- the slope of the road on which the vehicle is currently traveling is determined based on map information of a car navigation system (not shown) mounted on the vehicle 1.
- Information may be estimated by the gradient estimation unit 66.
- step ST104 when it is determined by the determination by the gradient determination unit 69 (step ST104) that the running road is not an uphill, it is determined whether or not the accelerator pedal 50 has been depressed (step S104). ST105). This determination is performed based on the accelerator opening acquired by the accelerator opening acquisition unit 62 by the accelerator opening state determination unit 70 included in the processing unit 61 of the ECU 60.
- the accelerator opening state determination unit 70 acquires the accelerator opening acquired by the accelerator opening acquisition unit 62 continuously or every predetermined short time, and when the acquired accelerator opening tends to increase. When it is determined that the accelerator pedal 50 has been depressed, and when the acquired accelerator opening degree is constant or tends to close, it is determined that the accelerator pedal 50 has not been depressed. If it is determined by the accelerator opening state determination unit 70 that the accelerator pedal 50 has been depressed, the processing procedure is exited.
- step ST105 when it is determined that the accelerator pedal 50 is not depressed by the determination by the accelerator opening state determination unit 70 (step ST105), or by the determination by the idle state determination unit 67 (step ST102), If it is determined that the engine is not in the idle-off state, it is next determined whether or not a fuel cut condition is satisfied (step ST106). This determination is performed by the fuel cut condition establishment determination unit 71 included in the processing unit 61 of the ECU 60. The fuel cut condition establishment determination unit 71 determines whether the fuel cut condition is based on whether the engine speed acquired by the engine speed acquisition unit 63 is equal to or higher than a predetermined speed and other state values such as water temperature and vehicle speed. It is determined whether it is established.
- the fuel cut condition establishment determination unit 71 determines that the fuel cut condition is satisfied when the engine speed acquired by the engine speed acquisition unit 63 is equal to or higher than a predetermined speed, and acquires the engine speed. When the engine speed acquired by the unit 63 is less than the predetermined speed, it is determined that the fuel cut condition is not satisfied. If it is determined by the fuel cut condition satisfaction determining unit 71 that the fuel cut condition is not satisfied, the process procedure is exited. That is, when it is determined that the fuel cut condition is not satisfied in this way, the fuel cut is not performed.
- the engine control unit 72 prohibits fuel cut and the vehicle 1 travels.
- the fuel is injected by the fuel injector 14 according to the state.
- step ST106 if it is determined by the determination at the fuel cut condition establishment determination unit 71 (step ST106) that the fuel cut condition is satisfied, next, the fuel cut is executed (step ST107).
- This fuel cut is executed by the engine control unit 72 included in the processing unit 61 of the ECU 60.
- the engine control unit 72 performs fuel cut by transmitting a control signal to the fuel injector 14 and stopping injection of fuel injected by the fuel injector 14.
- the above-described vehicle control device 2 performs fuel cut not only when the accelerator opening is fully closed but also when the accelerator opening is other than fully closed and also when the vehicle 1 is decelerated. Can be reduced. That is, in the conventional vehicle control device, the accelerator opening is made smaller than the load load opening by reducing the accelerator opening, and even when the vehicle 1 decelerates, the fuel injector 14 continues to inject fuel. On the other hand, in the vehicle control apparatus 2 according to the embodiment, even when the accelerator opening is not fully closed, the fuel cut is performed when the vehicle 1 is decelerating by reducing the accelerator opening. Accordingly, the amount of fuel injected by the fuel injector 14 can be reduced, and the fuel consumption can be reduced. As a result, fuel consumption can be improved more reliably.
- the shift control unit 73 controls the frictional engagement element 40 and the like to generate slippage in the frictional engagement element 40 and the like, and transmits power between the engine 10 and the drive wheels 48. Since the transmission rate at the time of reducing is reduced, it is possible to prevent the deceleration during deceleration from becoming too large. That is, when the fuel cut is performed, the engine 10 does not generate power, and therefore, the deceleration is likely to be larger than when the fuel cut is not performed. For this reason, if fuel cut is performed when the accelerator opening is not fully closed, the deceleration during deceleration may be greater than the deceleration expected by the driver.
- the gradient determination unit 69 determines that the road on which the vehicle 1 is traveling is an uphill, the fuel cut is not performed and the fuel cut is prohibited. Therefore, it can suppress that the vehicle 1 decelerates more than necessary. That is, in the case of an uphill, a larger driving force is required as compared with the case of traveling on a flat road, and therefore the vehicle 1 may decelerate even if the driver does not intend to decelerate. In this case, if the fuel cut is performed, the vehicle may decelerate more than necessary when there is no intention to decelerate. It is possible to prevent the vehicle from being decelerated despite having no intention. As a result, it is possible to suppress the deceleration more than necessary regardless of the driver's intention while improving the fuel consumption more reliably.
- the fuel cut is prohibited when the accelerator opening state determining unit 70 determines that the accelerator opening is increasing even when the vehicle is decelerating. Can be prevented from slowing down. That is, even when the vehicle 1 is decelerating, it is inferred that the driver has an intention to accelerate the vehicle 1 when the accelerator opening is increasing, that is, when the accelerator pedal 50 is depressed. Is done. For this reason, in this case, by prohibiting the fuel cut, it is possible to suppress the vehicle 1 from being decelerated against the driver's intention. As a result, it is possible to suppress the deceleration more than necessary regardless of the driver's intention to accelerate while improving the fuel consumption more reliably.
- the engine 10 and the engine 10 are driven by performing slip control of the friction engagement element 40 in accordance with the requested deceleration when the driver requests deceleration.
- the power transmission capacity when power is transmitted to the wheel 48 is changed according to the required deceleration.
- FIG. 10 is a main part configuration diagram of a modified example of the vehicle control device according to the embodiment.
- FIG. 11 is an explanatory diagram of acceleration generated with respect to the accelerator opening in the vehicle control device shown in FIG. 10.
- the power source may be provided with a motor 91 that is electrically operated in addition to the engine 10. That is, the vehicle 1 including the vehicle control device 90 is provided with the engine 10 and the motor 91 as power sources, and controls the power according to the traveling state of the vehicle 1 and the driving force required by the driver. You may provide as what is called a hybrid vehicle used as a driving force at the time.
- the motor 91 provided as a power source may be provided so as to be able to transmit power to a wheel to which the power of the engine 10 is transmitted among a plurality of wheels provided in the vehicle 1.
- it may be provided so that power can be transmitted to wheels other than the wheel to which the power of engine 10 is transmitted.
- the processing unit 61 of the ECU 60 includes an accelerator opening acquisition unit 62 and an engine rotation speed acquisition.
- a motor control unit 92 that controls the motor 91 is provided.
- the motor 91 is provided in addition to the engine 10 as a power source, and the motor control unit 92 is provided in the ECU 60, so that the engine control is performed when the vehicle 1 provided with the vehicle control device 90 according to the modification is traveling.
- the engine 10 is controlled by the unit 72 and the motor 91 is controlled by the motor control unit 92, so that the driving force is generated only by the power of the engine 10 according to the traveling state of the vehicle 1 or the like.
- a driving force is generated, or a driving force is generated by combining the power of the engine 10 and the power of the motor 91.
- the vehicle control device 90 performs fuel cut at the time of deceleration when the accelerator opening is other than fully closed, and responds to the driver's requested deceleration. Then, the shift control unit 73 performs slip control on the friction engagement element 40 and the like. Thereby, it is suppressed that the actual deceleration becomes too large by performing the fuel cut, and the actual deceleration is brought close to the required deceleration.
- the frictional engagement element 40 and the like are slid so that the force due to the inertia at the time of traveling of the vehicle 1 can be transmitted to the extent that the engine speed can be secured at a minimum. While engaging. Therefore, in the vehicle control device 2 according to the embodiment, when the fuel cut is performed at the time of deceleration when the accelerator pedal 50 is not fully closed, as shown by the embodiment deceleration DEe in FIG.
- the engine rotational speed securing deceleration DEs which is the deceleration that secures the engine rotational speed, is generated by the force due to the inertia during the traveling.
- the vehicle control device 90 even when the engine 10 is stopped by performing fuel cut, the vehicle 1 can be driven by the power of the motor 91, and the power of the motor 91 is increased.
- the power of the engine 10 is transmitted to the engine 10 via a wheel to which the power is transmitted, or via a power transmission device such as a known power transmission mechanism (not shown) interposed between the engine 10 and the motor 91. be able to.
- a power transmission device such as a known power transmission mechanism (not shown) interposed between the engine 10 and the motor 91.
- the transmission rate when the power is transmitted between the engine 10 and the drive wheels 48 is reduced by controlling the friction engagement element 40 and the like by the speed change control unit 73, so that the rotational speed of the engine 10 is reduced.
- the speed drop below the fuel cut return rotational speed there are cases where the speed drops below the fuel cut return rotational speed.
- the motor 91 in this case, when the fuel cut is finished and the engine 10 is operated independently, up to a rotation speed at which the engine 10 can perform the independent operation. Power necessary for increasing the rotational speed is provided so as to be transmitted to the engine 10.
- the fuel cut can be performed without generating the deceleration DEs corresponding to the engine rotational speed securing unlike the vehicle control device 2 according to the embodiment. Even when cutting is performed, the deceleration can be gently generated as shown by the example deceleration DEe in FIG. 11 without generating a shock due to the sudden increase in the deceleration. As a result, it is possible to improve the fuel consumption more reliably without generating a shock caused by performing fuel cut during deceleration.
- whether or not the vehicle 1 is decelerating is determined based on the detection result of the acceleration sensor 55, but whether or not the vehicle 1 is decelerating. This determination may be made based on the accelerator opening.
- the road load when the vehicle 1 travels is estimated by a method similar to the case where the gradient estimating unit 66 estimates the road gradient, and the driving force generated by the accelerator opening is compared with the road load. Then, it is determined whether or not the vehicle 1 is decelerating.
- a threshold is set for the accelerator opening, and when the accelerator opening acquired by the accelerator opening acquiring unit 62 is equal to or less than the threshold, the deceleration determining unit 68 determines that the vehicle 1 is decelerating.
- the threshold value of the accelerator opening in this case is set to an accelerator opening that balances the road load at which the driving force generated according to the accelerator opening is estimated according to at least the vehicle speed.
- the accelerator opening acquired by the accelerator opening acquiring unit 62 is equal to or less than an opening capable of generating a driving force that is balanced with the road load
- the driving force generated by the drive wheels 48 is equal to or less than the load It will be the driving force of.
- it can be estimated that the vehicle 1 decelerates at a deceleration corresponding to the difference between the road load and the driving force and it can be determined that the vehicle 1 is decelerating.
- the determination as to whether or not the vehicle 1 is decelerating is performed based on the accelerator opening and the road load, and is not performed based on the rate of change of the vehicle speed. Can be performed in a short time.
- the friction engagement element 40 included in the transmission 30 and the lockup mechanism 27 included in the torque converter 21 are used as the transmission state change mechanism.
- the transmission 30 is not a stepped transmission 30 having a plurality of shift stages as described above, but a so-called CVT (Continuously Variable) in which the transmission ratio can be changed steplessly by transmitting power through a belt or the like.
- the transmission clutch (not shown) provided with the CVT in the case of a known non-transmission device such as Transmission), the startup clutch (not shown) provided in the torque converter 21 and arranged in series with the fluid transmission path, A dedicated clutch (not shown) or the like provided in the power transmission path between 10 and the drive wheels 48 may be used.
- the transmission state change mechanism is not limited in its configuration as long as it can change the transmission state when power is transmitted between the engine 10 and the drive wheels 48, that is, the transmission ratio when power is transmitted. .
- the vehicle control device according to the present invention is useful for a vehicle control device provided in a vehicle that performs fuel cut when decelerating, and is particularly suitable for improving fuel efficiency.
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- Transportation (AREA)
- Automation & Control Theory (AREA)
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Abstract
Description
2、90 車両用制御装置
10 エンジン
15 エンジン回転数センサ
20 自動変速機
21 トルクコンバータ
27 ロックアップ機構
30 変速装置
46 差動装置
48 駆動輪
50 アクセルペダル
51 アクセル開度センサ
55 加速度センサ
60 ECU
61 処理部
62 アクセル開度取得部
63 エンジン回転数取得部
64 車速取得部
65 加速度取得部
66 勾配推定部
67 アイドル状態判定部
68 減速判定部
69 勾配判定部
70 アクセル開度状態判定部
71 フューエルカット条件成立判定部
72 エンジン制御部
73 変速制御部
80 記憶部
81 入出力部
91 モータ
92 モータ制御部
Claims (5)
- 操作量を調節することにより、車両の走行時における動力源であるエンジンで発生する動力を調節可能な動力調節部を備える車両用制御装置において、
前記動力調節部の前記操作量が0以外の場合で、且つ、前記車両の減速時には、前記エンジンの運転に用いる燃料の供給を停止する制御である燃料供給停止制御を行うことを特徴とする車両用制御装置。 - さらに、前記エンジンと駆動輪との間で動力を伝達する際における伝達状態を変更可能な伝達状態変更機構が備えられており、前記燃料供給停止制御を行う際には、前記エンジンと前記駆動輪との間で前記動力を伝達する際における伝達割合を低下させるように前記伝達状態変更機構を制御する請求項1に記載の車両用制御装置。
- 前記車両が走行中の道路が登り坂である場合には、前記燃料供給停止制御を禁止する請求項1に記載の車両用制御装置。
- 前記動力調節部の操作量が増加中である場合には、前記燃料供給停止制御を禁止する請求項1に記載の車両用制御装置。
- さらに、前記エンジンと駆動輪との間で動力を伝達する際における伝達状態を変更可能な伝達状態変更機構と、
前記車両の走行時における動力源であるモータと、
を備えており、
前記燃料供給停止制御を行う際には、前記エンジンと前記駆動輪との間で前記動力を伝達する際における伝達割合を低下させるように前記伝達状態変更機構を制御し、
前記モータは、前記燃料供給停止制御時に前記エンジンと前記駆動輪との間で前記動力を伝達する際における伝達割合を前記伝達状態変更機構で低下させることにより前記エンジンの回転数が前記エンジンの燃料供給復帰回転数以下に低下した場合において、前記燃料供給停止制御を終了して前記燃料の供給を復帰させる際に、前記エンジンを自立運転させるのに必要な動力を前記エンジンに伝達可能に設けられている請求項1に記載の車両用制御装置。
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CN2009801598429A CN102803688A (zh) | 2009-06-12 | 2009-06-12 | 车辆用控制装置 |
DE112009004903T DE112009004903T5 (de) | 2009-06-12 | 2009-06-12 | Fahrzeugsteuervorrichtung |
PCT/JP2009/002682 WO2010143237A1 (ja) | 2009-06-12 | 2009-06-12 | 車両用制御装置 |
JP2011518082A JP5158261B2 (ja) | 2009-06-12 | 2009-06-12 | 車両用制御装置 |
US13/377,662 US20120089309A1 (en) | 2009-06-12 | 2009-06-12 | Vehicle control device |
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JP (1) | JP5158261B2 (ja) |
CN (1) | CN102803688A (ja) |
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JP5158261B2 (ja) | 2013-03-06 |
CN102803688A (zh) | 2012-11-28 |
US20120089309A1 (en) | 2012-04-12 |
DE112009004903T5 (de) | 2012-06-14 |
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