WO2008075502A1 - 車両およびその制御方法 - Google Patents
車両およびその制御方法 Download PDFInfo
- Publication number
- WO2008075502A1 WO2008075502A1 PCT/JP2007/070819 JP2007070819W WO2008075502A1 WO 2008075502 A1 WO2008075502 A1 WO 2008075502A1 JP 2007070819 W JP2007070819 W JP 2007070819W WO 2008075502 A1 WO2008075502 A1 WO 2008075502A1
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- WO
- WIPO (PCT)
- Prior art keywords
- braking force
- vehicle
- power
- vehicle speed
- distribution
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 16
- 238000009826 distribution Methods 0.000 claims abstract description 118
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Classifications
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- 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
- B60W30/18109—Braking
- B60W30/18127—Regenerative braking
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- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
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- B60K6/543—Transmission for changing ratio the transmission being a continuously variable transmission
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Definitions
- the present invention relates to a vehicle and a control method thereof, and more particularly to a vehicle having a motor capable of outputting a regenerative braking force and a friction braking means capable of outputting a friction braking force, and a control method thereof.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-196064
- the present invention operates a vehicle having an electric motor capable of outputting a regenerative braking force and a friction braking means capable of outputting a friction braking force, whether or not priority is given to improving the energy efficiency of the vehicle.
- the purpose is to allow the user to select arbitrarily.
- the vehicle and the control method thereof according to the present invention employ the following means in order to achieve the above-described object.
- the vehicle according to the present invention can output an electric motor capable of outputting a regenerative braking force and a friction braking force.
- an electric motor capable of outputting a regenerative braking force and a friction braking force.
- Requested braking force setting means for setting the requested braking force requested by the driver's braking request operation
- An efficiency priority mode selection switch for selecting an efficiency priority mode that prioritizes energy efficiency
- the efficiency priority mode selection switch is turned off when the braking request operation is performed, the relationship between the vehicle speed and the distribution ratio between the regenerative braking force and the friction braking force with respect to the required braking force is obtained.
- the distribution ratio between the regenerative braking force and the friction braking force is set using the first braking force distribution constraint to be defined and the set required braking force, and when the braking request operation is performed,
- the efficiency priority mode selection switch is turned on, the relationship between the distribution ratio with respect to the required braking force and the vehicle speed is specified with priority on energy efficiency as compared with the first braking force distribution constraint.
- Braking force distribution ratio setting means for setting a distribution ratio between the regenerative braking force and the friction braking force using a braking force distribution restriction of 2 and the set required braking force;
- Braking control means for controlling the electric motor and the friction braking means so that the required braking force can be obtained based on the set distribution ratio
- the efficiency priority mode selection switch is turned off when the driver performs a braking request operation, regeneration is performed using the required braking force based on the braking request operation and the first braking force distribution constraint.
- a distribution ratio between the braking force and the friction braking force is set, and the motor and the friction braking means are controlled so that the required braking force is obtained based on the set distribution ratio.
- the efficiency priority mode selection switch is turned on when a braking request operation is performed, the second braking priority is given to the energy efficiency compared to the required braking force based on the braking request operation and the first braking force distribution constraint.
- the distribution ratio between the regenerative braking force and the friction braking force is set using the braking force distribution constraint, and the electric motor and the friction braking means are controlled so as to obtain the required braking force based on the set distribution ratio. .
- the vehicle may further include vehicle speed detection means for detecting a vehicle speed.
- the second braking force distribution constraint is that the regeneration control is performed when the detected vehicle speed is in a predetermined vehicle speed range.
- the power distribution may be increased as compared with the first braking force distribution constraint.
- the second braking force distribution constraint is such that the lower limit value of the regenerative execution vehicle speed, which is the vehicle speed when causing the electric motor to output the regenerative braking force, is smaller than the first braking force distribution constraint. It may be set. As a result, it is possible to further improve the energy efficiency of the vehicle by performing as much energy recovery by the electric motor as possible even at low vehicle speeds.
- the vehicle includes an internal combustion engine, an axle side rotating element connected to a predetermined axle, and an engine side connected to the engine shaft of the internal combustion engine and capable of differential rotation with respect to the axle side rotating element.
- the electric motor further comprising: a rotating element; and a power transmission means capable of outputting at least a part of the power from the engine shaft to the axle side; and a power storage means capable of exchanging electric power with the motor. May be able to input and output power to the axle or another axle different from the axle.
- the power transmission means is connected to the axle and the engine shaft of the internal combustion engine, and at least part of the power of the internal combustion engine is input to the axle side with input and output of electric power and power. It may be power power input / output means capable of outputting and exchanging power with the power storage means.
- the power power input / output means is connected to three shafts of a power generation motor capable of power input / output, the axle, the engine shaft of the internal combustion engine, and a rotation shaft of the power generation motor.
- the power transmission means may be a continuously variable transmission! /.
- the electric motor may be capable of inputting / outputting power to / from a predetermined axle.
- a vehicle control method includes an electric motor capable of outputting a regenerative braking force, friction braking means capable of outputting a friction braking force, and an efficiency priority mode for selecting an efficiency priority mode prioritizing energy efficiency.
- a vehicle control method comprising a selection switch,
- the efficiency priority mode selection switch is turned on at the time of being made, priority is given to energy efficiency as compared with the first braking force distribution constraint, and the ratio of the distribution ratio to the required braking force and the vehicle speed are Setting a distribution ratio between the regenerative braking force and the friction braking force using a second braking force distribution constraint that defines a relationship and the set required braking force;
- step (b) controlling the electric motor and the friction braking means so that the required braking force is obtained based on the distribution ratio set in step (a);
- the second braking force distribution constraint is that the regenerative braking force distribution is compared with the first braking force distribution constraint when the vehicle speed is in a predetermined vehicle speed range. You may increase it.
- the second braking force distribution constraint is that the lower limit value of the regenerative execution vehicle speed that is the vehicle speed when the regenerative braking force is output to the electric motor It may be set smaller than the first braking force distribution constraint.
- FIG. 1 is a schematic configuration diagram of a hybrid vehicle 20 according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing an example of a braking control routine that is executed by the hybrid ECU 70 when the driver depresses the brake pedal 85 while the hybrid vehicle 20 is traveling.
- FIG. 3 is an explanatory diagram showing an example of a required braking force setting map.
- FIG. 4 is an explanatory diagram illustrating a normal-time regenerative distribution ratio setting map and an ECO-mode regenerative distribution ratio setting map.
- FIG. 5 is a schematic configuration diagram of a hybrid vehicle 20A according to a modification.
- FIG. 6 is a schematic configuration diagram of a hybrid vehicle 20B according to another modification.
- FIG. 7 is a schematic configuration diagram of a hybrid vehicle 20C according to still another modification.
- FIG. 1 is a schematic configuration diagram of a hybrid vehicle 20 as a vehicle according to an embodiment of the present invention.
- the hybrid vehicle 20 shown in the figure is connected to an engine 22, a three-shaft power distribution and integration mechanism 30 connected to a crankshaft 26 that is an output shaft of the engine 22 via a damper 28, and a power distribution and integration mechanism 30.
- Brake unit 90 electronically controlled hydraulic brake unit
- hybrid vehicle 20 as a whole Electronic control unit (hereinafter referred to as “hybrid ECU”) 70 and the like.
- the engine 22 is an internal combustion engine that outputs power by receiving a hydrocarbon-based fuel such as gasoline and light oil.
- the engine electronic control unit (hereinafter referred to as "engine ECU") 24 uses a fuel injection amount. Control of ignition timing, intake air volume, etc.
- the engine ECU 24 is provided for the engine 22 and detects the operating state of the engine 22. Signals from various sensors are input.
- the engine ECU 24 communicates with the hybrid ECU 70, and controls the operation of the engine 22 based on the control signal from the hybrid ECU 70, the signal from the sensor, and the like, and data on the operation state of the engine 22 as necessary. No, output to the hybrid ECU70.
- the power distribution and integration mechanism 30 includes an external gear sun gear 31, an internal gear ring gear 32 disposed concentrically with the sun gear 31, and a plurality of gears meshed with the sun gear 31 and meshed with the ring gear 3 2.
- a planetary gear mechanism is provided that includes a pinion gear 33 and a carrier 34 that holds the plurality of pinion gears 33 so as to rotate and revolve.
- the sun gear 31, the ring gear 32, and the carrier 34 serve as rotational elements to perform a differential action.
- the carrier 34 as the engine side rotation element is connected to the crankshaft 26 force of the engine 22 and the sun gear 31 to the motor MG1 and the ring gear 32 as the axle side rotation element is connected to the reduction gear 35 via the ring gear shaft 32a.
- the power distribution and integration mechanism 30 distributes the power from the engine 22 input from the carrier 34 to the sun gear 31 side and the ring gear 32 side according to the gear ratio when the motor MG1 functions as a generator, and the motor MG1 When functioning, the power from the engine 22 input from the carrier 34 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side.
- the power output to the ring gear 32 is finally output from the ring gear shaft 32a to the wheels 39a and 39b, which are drive wheels, via the gear mechanism 37 and the differential gear 38.
- the motor MG1 and the motor MG2 are both configured as known synchronous generator motors that operate as generators and can operate as motors, and are batteries 50 that are secondary batteries via inverters 41 and 42. And exchange power.
- a power line 54 connecting the inverters 41 and 42 and the battery 50 is configured as a positive bus and a negative bus shared by the inverters 41 and 42, and is generated by one of the motors MG1 and MG2. Electricity can be consumed by the other motor. Therefore, the knotter 50 is charged / discharged by the electric power generated by the motor MG 1 or MG 2 or the insufficient electric power, and if the electric power balance is balanced by the motors MG 1 and MG 2. Therefore, the battery 50 is not charged / discharged.
- the motors MG1 and MG2 are both driven and controlled by a motor electronic control unit (hereinafter referred to as “motor ECU”) 40.
- Motor ECU40 has motor M Gl, MG2 signals necessary for driving and controlling, for example, signals from rotational position detection sensors 43, 44 that detect the rotational position of the rotors of motors MG1, MG2, and motors MG1, MG1, A phase current or the like applied to MG2 is input, and a switching control signal or the like to the inverters 41 and 42 is output from the motor ECU 40.
- the motor ECU 40 executes a rotation speed calculation routine (not shown) based on signals input from the rotation position detection sensors 43 and 44, and calculates the rotation speeds Nm 1 and Nm2 of the rotors of the motors MG1 and MG2.
- the motor ECU 40 communicates with the hybrid ECU 70 to drive and control the motors MG1 and MG2 based on control signals from the hybrid ECU 70, etc., and to perform high-prediction data on the operating state of the motors MG1 and MG2 as necessary. Output to ECU70.
- the battery 50 is managed by a battery electronic control unit (hereinafter referred to as “battery ECU”) 52.
- the battery ECU 52 has signals necessary for managing the battery 50, for example, a voltage between terminals from a voltage sensor (not shown) installed between the terminals of the battery 50, and an electric power connected to the output terminal of the battery 50.
- the charging / discharging current from a current sensor (not shown) attached to the line 54, the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input.
- the battery ECU 52 outputs data on the state of the battery 50 to the hybrid ECU 70 and the engine ECU 24 by communication as necessary. Further, the battery ECU 52 calculates the remaining capacity SOC based on the integrated value of the charging / discharging current detected by the current sensor in order to manage the battery 50.
- the brake unit 90 is provided for the master cylinder 91, the fluid pressure (hydraulic) brake actuator 92, the wheels 39a and 39b as driving wheels, and other wheels, and the brake disc attached to each wheel.
- the wheel cylinders 93a to 93d and wheel cylinders 93a to 93d that drive the brake pads that can apply frictional braking force to the corresponding wheels are detected and the oil pressure of the corresponding wheel cylinder (wheel cylinder pressure) is detected.
- the brake actuator 92 is a master cylinder cut solenoid that controls the communication state between a pump and an accumulator as a hydraulic pressure generation source (not shown), the master cylinder 91, and the wheel cylinders 93a to 93d. It has a stroke simulator that creates a reaction force against the pedal depression force according to the amount of depression of the valve and brake pedal 85.
- the brake ECU 95 detects the master cylinder pressure from the master cylinder pressure sensor (not shown) that detects the master cylinder pressure via the signal line (not shown), the wheel cylinder pressure from the wheel cylinder pressure sensors 94a to 94d, the wheel not shown.
- a wheel speed from a speed sensor, a steering angle from a steering angle sensor (not shown), and the like are input, and various signals are exchanged with the hybrid ECU 70 and the like by communication.
- the brake ECU 95 has a friction braking torque corresponding to the share of the braking unit 90 of the braking torque to be applied to the hybrid vehicle 20 based on the brake pedal stroke BS, the vehicle speed V, etc. indicating the depression amount of the brake pedal 85.
- the brake actuator 92 is controlled to act on the wheels 39a and 39b and other wheels.
- the brake ECU 95 performs so-called ABS control, traction control (TRC), vehicle stabilization control (based on various parameters such as wheel speed, vehicle longitudinal and lateral acceleration, vehicle speed, and steering angle detected by sensors (not shown).
- the brake ECU 95 sets the brake actuator 92 so that the friction braking torque acts on the wheels 39a, 39b and other wheels regardless of the depression of the brake pedal 85 by the driver when a predetermined condition is satisfied. Can be controlled.
- the hybrid ECU 70 is configured as a microprocessor centered on the CPU 72.
- the hybrid ECU 70 includes a ROM 74 that stores a processing program, a RAM 76 that temporarily stores data, an input / output port and a communication port (not shown). .
- the hybrid ECU CU70 has an ignition signal from the ignition switch (start switch) 80, a shift position SP from the shift position sensor 82 that detects the shift position SP, which is the operating position of the shift lever 81, and a depression of the accelerator pedal 83 Accelerator opening Acc from the pedal pedal position sensor 84 that detects the amount of brake pedal stroke sensor BS that detects the amount of depression of the brake pedal 85 Brake pedal stroke BS from the 86, vehicle speed V from the vehicle speed sensor 87, etc. Input through port. Also, in the vicinity of the driver's seat of the hybrid vehicle 20 of the embodiment, an ECO switch for selecting an ECO mode (efficiency priority mode) that prioritizes energy efficiency such as fuel efficiency rather than drivability as a control mode during driving.
- ECO mode efficiency priority mode
- the O switch 88 is provided.
- the O switch 88 is also connected to the hybrid ECU70.
- the ECO switch 88 When the ECO switch 88 is turned on by a driver or the like, the normal ECO flag Feco, which is set to a value of 0 (normally when the switch is off), is set to a value of 1, and a predetermined efficiency priority time is used.
- the hybrid vehicle 20 is controlled according to these various control procedures.
- the hybrid ECU 70 is connected to the engine ECU 24, the motor ECU 40, the battery ECU 52, the brake ECU 95, etc. via the communication port, and performs various controls with the engine ECU 24, the motor ECU 40, the battery ECU 52, the brake ECU 95, etc. Signals and data are exchanged.
- the ring gear shaft 32a as the axle is based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver.
- the required torque to be output is calculated, and the engine 22, the motor MG1, and the motor MG2 are controlled so as to be output to the power gear gear shaft 32a corresponding to the required torque.
- the operation control mode of the engine 22 and the motor MG1 and the motor MG2 is such that the engine 22 is operated and controlled so that the power corresponding to the required torque is output from the engine 22, and all the power output from the engine 22 is the power distribution integrated mechanism.
- 30 and motor MG1 and motor MG2 are converted to torque and output to ring gear shaft 32a.
- Torque conversion operation mode for driving and controlling motor MG1 and motor MG2, and the required power and power required for charging / discharging battery 50
- the engine 22 is operated and controlled so that the power corresponding to the sum of the power is output from the engine 22, and all or a part of the power output from the engine 22 with charging / discharging of the battery 50 is part of the power distribution and integration mechanism 30.
- Motor MG1 and motor MG2 are required to output power to S ring gear shaft 32a with torque conversion by motor MG1 and motor MG2.
- a charge / discharge operation mode for driving and controlling the motor MG2
- a motor operation mode for controlling the operation so that the motor MG2 stops the operation and outputs the power corresponding to the required power from the motor MG2 to the ring gear shaft 32a.
- FIG. 2 shows an example of a braking control routine executed by the hybrid ECU 70 every predetermined time (for example, every several msec) when the brake pedal 85 is depressed by the driver while the hybrid vehicle 20 is traveling. It is a flowchart.
- the engine 22 is basically stopped when the vehicle is decelerated. Therefore, here, the operation when the engine 22 is stopped will be described as an example.
- the CPU 72 of the hybrid ECU 70 determines that the brake pedal stroke BS from the brake pedal stroke sensor BS, the vehicle speed V from the vehicle speed sensor 87, and the rotation speed of the motor MG2.
- Input processing of data required for control such as Nm2, input limit Win as charge allowable power, which is power allowable for charge of battery 50, and value of ECO flag Feco is executed (step S100).
- the rotation speed Nm 2 of the motor MG2 is input from the motor ECU 40 by communication.
- the input limit Win of the battery 50 is input from the battery ECU 52 via communication.
- the input limit Win of battery 50 sets the basic value of input limit Win based on the temperature of battery 50, and sets the correction factor for input limit based on the remaining capacity (SOC) of battery 50, It can be set by multiplying the set basic value and the correction factor.
- the pedal depression force Fpd applied to the brake pedal 85 by the driver is calculated based on the input brake pedal stroke BS (step S110).
- the relationship between the brake pedal stroke BS and the pedal depression force Fpd is predetermined and stored in the ROM 74 of the hybrid ECU 70 as a pedal depression force setting map (not shown), and the pedal depression force Fpd is given as The one corresponding to the brake pedal stroke BS is derived from the map.
- the required braking force BF * requested by the driver is set based on the pedal depression force Fpd thus calculated (step S120).
- the relationship between the pedal depression force Fpd by the driver and the required braking force BF * is predetermined and stored in the ROM of the hybrid ECU 70 as a required braking force setting map.
- the required braking force BF * The one corresponding to the given pedal effort Fpd is derived from the map.
- Fig. 3 shows an example of the required braking force setting map.
- step S130 it is determined whether or not the ECO flag Feco is 0, that is, whether or not the ECO switch 88 is turned off by the driver or the like (step S130), and the ECO flag Feco is 0.
- the vehicle speed V input in step S100, the required braking force BF * set in step S120, and the normal regeneration distribution rate setting map as the first braking force distribution constraint are obtained.
- the target regenerative distribution ratio d indicating the ratio of the regenerative braking force to be output to the motor MG2 to the required braking force BF * is set (step S140).
- the ECO switch 88 when the ECO switch 88 is turned on by the driver or the like and the ECO flag Feco is set to 1, the vehicle speed V input in step S100 and the request system set in step S120 are set.
- the target regeneration distribution rate d is set using the power BF * and the map for setting the regeneration distribution rate in the ECO mode as the second braking power distribution constraint (step S150). As illustrated in Fig.
- the normal regeneration distribution ratio setting map (see the solid line in the figure) and the ECO mode regeneration distribution ratio setting map (see the broken line in the figure) each have a certain required braking force BF *
- the relationship between the distribution ratio between the regenerative braking force by the motor MG2 and the friction braking force by the brake unit 90 and the vehicle speed V is preliminarily created through experiments and analysis and stored in the ROM74. Therefore, in step S 140 or S 150, the target regeneration distribution rate d corresponding to the given required braking force BF * and vehicle speed V is obtained from the normal regeneration distribution rate setting map or the ECO mode regeneration distribution rate setting map. Derived 'set.
- the vehicle speed V is set to a predetermined lower limit value, giving priority to ensuring good braking performance, braking feeling, and drivability over energy efficiency. If VI (for example, about 7 km) is exceeded, regenerative braking force is output to motor MG2, and if vehicle speed V is within the range from lower limit value VI to predetermined value V2 (for example, about 15 km), regenerative braking force is applied from motor MG2. For example, the output is proportional to the vehicle speed V.
- the regenerative braking force by the motor MG2 is set to a constant value BFref regardless of the vehicle speed V in consideration of the rated torque of the motor MG2. I am going to do that. Therefore, the normal regeneration distribution rate setting map is created so as to satisfy the constraints for normal time that prioritize drivability over such energy efficiency (see the solid line in Fig. 4).
- the ECO switch 88 is turned on, priority is given to energy efficiency such as fuel efficiency over drivability, and the vehicle speed V is lower than the normal lower limit VI (for example, about 4 km).
- the regenerative braking force is output to the motor MG2, and when the vehicle speed V is within the range where the lower limit force is also smaller than the predetermined value V2 (for example, about 10 km), the regenerative braking force is applied from the motor MG2 to the vehicle speed V If the vehicle speed V is more than ⁇ IV2 ', the regenerative braking force by the motor MG2 is set to a constant value BFref. Therefore, the regenerative distribution rate setting map for ECO mode is It is created to satisfy the constraints for ECO mode that prioritize energy efficiency over such drivability (see dashed line in Fig. 4).
- the regenerative distribution rate setting map for ECO mode is compared to the normal regenerative distribution rate setting map directly VI) for the lower limit of the regenerative execution vehicle speed, which is the vehicle speed when the motor MG2 outputs regenerative braking force. It is set to be small.
- the ECO mode 88 regenerative distribution ratio setting map is used when the ECO switch 88 is on
- the normal regenerative distribution ratio setting map is displayed when the ECO switch 88 is off.
- the distribution of regenerative braking force increases when the vehicle speed V is in the low vehicle speed range (VI ' ⁇ V ⁇ V2).
- the target regenerative braking power BFr * is calculated by multiplying the required braking force BF * set in step S 120 by the target regenerative distribution ratio d ( Step S160). Further, by dividing the input limit Win of the battery 50 by the rotational speed Nm2 of the motor MG2, the torque limit Tmin of the motor MG2 is calculated (step S170), and the target regenerative braking force BFr * and a predetermined conversion factor k are calculated. The temporary motor torque Tm2tmp is calculated by dividing the product by the gear ratio Gr of the reduction gear 35 (step S180).
- the torque command Tml * for the motor MG1 is set to the value 0, and the larger one of the torque limit Tmin and the temporary motor torque Tm2tmp calculated earlier (the smaller braking /!) Is applied to the motor MG2.
- Set as torque command Tm2 * (step S190).
- step S200 it is determined whether or not the target regeneration distribution rate d set in step S140 or step S150 is less than 1 (step S200), if the target regeneration distribution ratio d is less than 1, reduce the required braking force BF * by dividing the product of the torque command Tm2 * and the gear ratio Gr of the reduction gear 35 by the conversion factor k.
- step S210 To set the required friction braking force BFf * to be generated in the brake unit 90 (step S210).
- step S220 the required friction braking force BFf * can be covered by the regenerative braking force by the motor MG2, so the required friction braking force BFf * is set to the value 0 ( Step S220). Then, the torque commands Tml * and Tm2 * are transmitted to the motor ECU 40, and the required friction braking force BF * is transmitted to the brake ECU 95 (step S230). ), The processing after step SI 00 is executed again.
- the motor ECU 40 that has received the torque commands Tml * and Tm2 * performs switching control of the switching elements of the inverters 41 and 42 so that the motors MG1 and MG2 are driven in accordance with the torque commands Tml * and Tm2 *.
- the brake ECU 95 that has received the required friction braking force BFf * causes the brake actuator 95 to apply the friction braking torque according to the required friction braking force BFf * to the wheels 39a, 39b, which are the drive wheels, and to other wheels. Controls the Ueta 92.
- the request based on the brake request operation is performed.
- the target regeneration distribution rate d is set using the braking force BF * and the normal regeneration distribution rate setting map that is the first braking force distribution constraint (step S140), and based on the set target regeneration distribution rate d
- the motor 02 and the brake unit 90 are controlled so that the required braking force BF * is obtained (steps 3160 to 3230).
- the required braking force BF * based on the braking request operation and the normal regeneration distribution rate setting are set.
- the target regeneration distribution ratio d is set using the map for setting the regeneration distribution ratio in the ECO mode, which is the second braking force distribution constraint that prioritizes energy efficiency over the map (step S150), and the set target regeneration ratio is set.
- the motor MG2 and the brake unit 90 are controlled so that the required braking force BF * is obtained based on the distribution rate d (steps S160 to S230).
- the hybrid vehicle 20 it is possible to arbitrarily select whether to prioritize drivability or improve vehicle energy efficiency simply by operating the ECO switch 88 as the efficiency priority mode selection switch. It becomes. In other words, if the ECO switch 88 is turned off, the distribution of the friction braking force by the brake unit 90 is sufficiently secured in the low vehicle speed range, so that the energy efficiency is somewhat impaired when the braking request operation is executed. In addition, it is possible to secure a good drivability such as braking performance and braking feeling.
- the ECO switch 88 if the ECO switch 88 is turned on, the distribution of the regenerative braking force by the motor MG2 is set more in the low vehicle speed range, so the drivability is within the range that does not hinder driving when the braking request operation is executed. It is possible to improve the energy efficiency even if the damage is somewhat impaired.
- the hybrid vehicle 20 of the example Therefore, the ECO mode regenerative distribution ratio setting map used when the ECO switch 88 is turned on always regenerates the regenerative braking force when the vehicle speed V is within the specified low vehicle speed range (V ⁇ V ⁇ V2).
- the hybrid vehicle 20 of the above embodiment is a force that outputs the power of the motor MG2 to the axle connected to the ring gear shaft 32a.
- the application object of the present invention is not limited to this. . That is, the present invention is different from the axle (the axle to which the wheels 39a and 39b are connected) that is connected to the ring gear shaft 32a as in the hybrid vehicle 20A as a modified example shown in FIG.
- the present invention may be applied to a vehicle that outputs to the wheels 39c and 39d in FIG.
- the hybrid vehicle 20 of the above embodiment outputs the power of the engine 22 to the ring gear shaft 32a as an axle connected to the wheels 39a and 39b via the power distribution and integration mechanism 30.
- the target is not limited to this.
- the present invention is connected to the inner rotor 23 2 connected to the crankshaft of the engine 22 and the axle that outputs power to the wheels 39a and 39b, like a hybrid vehicle 20B as a modified example shown in FIG.
- the present invention may be applied to a motor having an outer rotor 234 and a counter-rotor motor 230 that transmits a part of the power of the engine 22 to the axle and converts the remaining power into electric power.
- the present invention can be applied to an electric vehicle including an electric motor capable of inputting / outputting power to / from an axle and friction braking means such as the brake unit 90.
- the present invention provides power transmission for transmitting the power of the engine 22 to the axle side instead of the power distribution and integration mechanism 30 having the ring gear 32 as the axle-side rotating element and the carrier 34 as the engine-side rotating element. It may be applied to a vehicle equipped with a continuously variable transmission (hereinafter referred to as “CVT”) as a means.
- FIG. 7 shows a hybrid vehicle 20C as an example of such a vehicle.
- the hybrid vehicle 20C of the modified example shown in the figure receives power from the engine 22 via a torque converter 130, a forward / reverse switching mechanism 135, a belt-type CVT 140, a gear mechanism 37, a differential gear 38, etc.
- the motor MG which is a synchronous generator motor, after being output to the wheels 39c, 39d, which are rear wheels, for example, via the gear mechanism 37 ', differential gear 38', etc.
- the torque converter 130 is configured as a fluid type torque converter having a lock-up mechanism.
- the forward / reverse switching mechanism 135 includes, for example, a double-pinion planetary gear mechanism, a brake B1 and a clutch C1, and performs forward / reverse switching and connection / disconnection between the torque converter 130 and the CVT 140.
- the CVT 140 is connected to the primary pulley 143 that can change the groove width connected to the input shaft 141 as the engine side rotating element, and to the output shaft 142 that can change the groove width in the same manner and the axle side rotating element. Secondary pulley 144, and primary pulley 143 and belt 145 wound around the groove of secondary pulley 144.
- the CVT 140 changes the groove width of the primary pulley 143 and the secondary pulley 144 by hydraulic fluid from the hydraulic circuit 147 that is driven and controlled by the CVT electronic control unit 146, thereby continuously changing the power input to the input shaft 141. And output to the output shaft 142.
- the motor MG is connected to an on / or generator 29 driven by the engine 22 via an inverter 45 and a battery (high voltage battery) 50 having an output terminal connected to the power line from the alternator 29. Thereby, the motor MG is driven by the electric power from the alternator 29 or the battery 50, or the battery 50 is charged by the electric power generated by regeneration.
- the hybrid vehicle 20C configured as described above mainly travels by outputting power from the engine 22 to the front wheels 39a and 39b according to the driver's operation of the accelerator pedal 83, and if necessary, the wheels 39a, 39b, In addition to the output of power to 39b, the power from motor MG is output to rear wheels 39c and 39d to drive by four-wheel drive.
- a toroidal CVT may be applied instead of the belt-type CVT140! /.
- the motors MG2, MG or rotor motor 230 that can output the regenerative braking force correspond to the “motor”
- the brake unit 90 that can output the friction braking force has the “friction braking”. It corresponds to “means”.
- the ECO switch 88 for selecting the ECO mode that gives priority to energy efficiency such as fuel efficiency over drivability corresponds to the “efficiency priority mode selection switch”.
- the engine 22 corresponds to an “internal combustion engine”, and includes a power distribution integrated mechanism 30 having a ring gear 32 as an axle side rotation element and a carrier 34 as an engine axis side rotation element, and an input shaft 141 as an axle side rotation element.
- the CVT 140 having the output shaft 142 as the engine shaft side rotation element corresponds to the “power transmission means”.
- the motor MG1 and the power distribution integrated mechanism 30 or the counter-rotor motor 230 correspond to “power power input / output means” and correspond to the battery 50 power storage means ”, and the motor MG1, alternator 29 or counter-rotor motor 230 power S
- the power distribution integration mechanism 30 corresponds to a “3-axis power input / output device”. It should be noted that the correspondence between the main elements of these examples and the main elements of the invention described in the column of the disclosure of the invention is the best for implementing the invention described in the column of disclosure of the invention of the examples. Since the embodiment is an example for specifically explaining the embodiment, the elements of the invention described in the column of the disclosure of the invention are not limited. In other words, the examples are merely specific examples of the invention described in the disclosure column of the invention, and the interpretation of the invention described in the disclosure column of the invention should be made based on the description in that column. is there.
- the present invention can be used in the vehicle manufacturing industry and the like.
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Abstract
Description
Claims
Priority Applications (3)
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US12/519,307 US8255137B2 (en) | 2006-12-19 | 2007-10-25 | Vehicle and control method thereof |
CN200780047403XA CN101573249B (zh) | 2006-12-19 | 2007-10-25 | 车辆及其控制方法 |
DE112007003093.3T DE112007003093B4 (de) | 2006-12-19 | 2007-10-25 | Fahrzeug und Steuerverfahren von diesem |
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JP2006-341200 | 2006-12-19 | ||
JP2006341200A JP4258548B2 (ja) | 2006-12-19 | 2006-12-19 | 車両およびその制御方法 |
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WO2008075502A1 true WO2008075502A1 (ja) | 2008-06-26 |
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PCT/JP2007/070819 WO2008075502A1 (ja) | 2006-12-19 | 2007-10-25 | 車両およびその制御方法 |
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US (1) | US8255137B2 (ja) |
JP (1) | JP4258548B2 (ja) |
CN (1) | CN101573249B (ja) |
DE (1) | DE112007003093B4 (ja) |
WO (1) | WO2008075502A1 (ja) |
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GB2450400A (en) * | 2007-06-20 | 2008-12-24 | Ford Global Tech Llc | Hybrid vehicle propulsion system with braking response |
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Also Published As
Publication number | Publication date |
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US8255137B2 (en) | 2012-08-28 |
JP4258548B2 (ja) | 2009-04-30 |
CN101573249B (zh) | 2011-06-29 |
CN101573249A (zh) | 2009-11-04 |
DE112007003093B4 (de) | 2017-04-27 |
DE112007003093T5 (de) | 2009-10-15 |
JP2008154393A (ja) | 2008-07-03 |
US20100076657A1 (en) | 2010-03-25 |
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