WO2013065166A1 - 車両および車両の制御方法 - Google Patents
車両および車両の制御方法 Download PDFInfo
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- WO2013065166A1 WO2013065166A1 PCT/JP2011/075405 JP2011075405W WO2013065166A1 WO 2013065166 A1 WO2013065166 A1 WO 2013065166A1 JP 2011075405 W JP2011075405 W JP 2011075405W WO 2013065166 A1 WO2013065166 A1 WO 2013065166A1
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- vehicle
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Images
Classifications
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- 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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
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Definitions
- the present invention relates to a vehicle and a vehicle control method, and more particularly, to a travel control of a vehicle that travels using the inertia force of the vehicle.
- a vehicle that is mounted with a power storage device (for example, a secondary battery or a capacitor) and travels by using a driving force generated from electric power stored in the power storage device as an environment-friendly vehicle.
- a power storage device for example, a secondary battery or a capacitor
- Such vehicles include, for example, electric vehicles, hybrid vehicles, fuel cell vehicles, and the like.
- JP-T-2008-520485 discloses that in a hybrid vehicle including an internal combustion engine and a motor generator, when the motor generator is in the generator mode, the output is higher than the actual power consumption of the vehicle electrical system.
- a configuration for controlling the motor generator to alternately repeat a first interval for driving the motor generator to operate and a second interval for switching off the motor generator is disclosed.
- Patent Document 1 when the motor generator operates as a generator, the motor generator is driven at an operating point with high efficiency in the first interval, and in the second interval. The motor generator is stopped. As a result, the operation of the motor generator is suppressed from being continued at a low efficiency during the power generation operation, so that the energy efficiency of the vehicle in the power generation operation can be improved.
- Patent Document 2 Japanese Patent Laying-Open No. 2010-6309 describes a hybrid vehicle including an internal combustion engine and a motor generator in a traveling state using a driving force generated by the internal combustion engine and an inertia state in which the internal combustion engine is stopped.
- working alternately is disclosed.
- the internal combustion engine can be driven at a highly efficient operating point, so that fuel efficiency can be improved.
- Patent Document 1 when power is generated by the motor generator, the motor generator is driven and stopped repeatedly. It was not something to change.
- Patent Document 2 discloses a configuration in which acceleration inertial running control is performed by repeatedly driving and stopping an internal combustion engine in a hybrid vehicle. Driving was not considered.
- Patent Document 2 When performing acceleration coasting as disclosed in JP 2010-6309 A (Patent Document 2), when the slope of the road surface on which the vehicle travels changes, the acceleration / deceleration of the vehicle is affected by the gravity acting on the vehicle. Therefore, in order to maintain the vehicle speed, it is necessary to control the output of the drive source with respect to the change in the slope of the road surface.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2010-6309 (Patent Document 2), the vehicle is No specific control was mentioned when there was a change in the slope of the running road surface.
- the present invention has been made to solve such a problem, and an object of the present invention is to change a slope change of a road surface in a vehicle capable of running using a driving force from an engine and / or a motor generator. It is to improve the energy efficiency when the vehicle travels appropriately in consideration.
- a vehicle includes a drive source that generates a driving force for driving the vehicle, a control device that controls the drive source, and a slope detection unit that detects the slope of the road surface.
- the control device changes a driving force for driving the vehicle while switching between a first state in which the driving power is generated at the first level and a second state in which the driving force is smaller than that in the first state. Run the operation.
- the control device recognizes that the vehicle is traveling on a downhill based on the gradient detected by the gradient detection unit, the control device is more than the case where the vehicle is traveling on a flat road.
- the driving force in the first state is set small.
- control device executes the driving force changing operation when the change in the driving force requested by the user is within a predetermined range.
- control device switches between the first and second states so that the speed of the vehicle is maintained within an allowable range during execution of the driving force change operation.
- control device switches to the first state in response to a decrease in the vehicle speed to a lower limit value of the allowable range, and a second response to the increase in the vehicle speed to the upper limit value of the allowable range. Switch to the state.
- control device sets the lower limit value higher when the vehicle is traveling on a downhill than when the vehicle is traveling on a flat road.
- control device gradually lowers the lower limit value with time when the vehicle returns from a downhill to a flat road.
- control device sets the driving force in the second state to be larger when the vehicle is traveling downhill than when the vehicle is traveling on a flat road.
- the drive source is a rotating electric machine.
- the control device performs a regenerative operation of the rotating electrical machine in the second state when the vehicle is traveling downhill.
- control device sets the driving force in the first state to be smaller as the magnitude of the downward gradient is larger.
- the driving force in the first state is set larger than a reference driving force having a constant output capable of maintaining the speed of the vehicle.
- the driving force in the second state is set smaller than the reference driving force.
- control device stops generating the driving force from the driving source in the second state.
- the vehicle travels mainly by the inertial force of the vehicle in the second state.
- the vehicle further includes another drive source that generates a driving force for driving the vehicle.
- the control device performs a driving force change operation for switching between a third state in which a second level of driving force is generated and a fourth state in which a driving force smaller than the third state is generated for the other driving sources. Execute.
- control device sets the other drive source to the third state when the drive source is in the first state, and sets the other drive source to the fourth state when the drive source is in the second state. To do.
- control device sets the driving force in the third state to be smaller for other driving sources when the vehicle is traveling on a downhill than when the vehicle is traveling on a flat road.
- the sum of the driving force of the driving source in the first state and the driving force of the other driving source in the third state is larger than a reference driving force having a constant output capable of maintaining the speed of the vehicle. Is set.
- the sum of the driving force of the driving source in the second state and the driving force of the other driving source in the fourth state is set to be smaller than the reference driving force.
- one of the drive source and the other drive source is a rotating electric machine
- the other of the drive source and the other drive source is an engine
- both the drive source and the other drive source are rotating electrical machines.
- the drive source is either a rotating electrical machine or an engine.
- the vehicle control method is a control method for a vehicle having a drive source that generates travel driving force and a slope detection unit for detecting the slope of the road surface.
- the control method includes a step of setting the drive source in a first state that generates a predetermined level of drive force, a step of setting the drive source in a second state in which the drive force is smaller than that in the first state, It is recognized that the vehicle is traveling downhill based on the step of executing the driving force changing operation for driving the vehicle while switching the second state and the inclination detected by the inclination detecting unit.
- the case includes a step of setting the driving force in the first state to be smaller than when the vehicle is traveling on a flat road.
- FIG. 1 is an overall block diagram of a vehicle according to a first embodiment.
- 3 is a time chart for explaining an overview of inertial running control in the first embodiment.
- 4 is a flowchart for illustrating an inertial traveling control process executed by an ECU in the first embodiment.
- 6 is a time chart for explaining an overview of inertial running control in the second embodiment.
- Embodiment 2 it is a flowchart for demonstrating the inertial running control process performed by ECU.
- 10 is a time chart for illustrating an overview of inertial traveling control in the third embodiment.
- Embodiment 3 it is a flowchart for demonstrating the inertial traveling control process performed by ECU.
- 10 is a time chart for illustrating an overview of inertial running control in a fourth embodiment.
- Embodiment 4 it is a flowchart for demonstrating the inertial running control process performed by ECU. It is a time chart for demonstrating the other example of inertial traveling control.
- Embodiment 5 which uses an engine as a drive source, it is a flowchart for demonstrating the inertial running control process performed by ECU.
- FIG. 10 is an overall block diagram of a hybrid vehicle according to a sixth embodiment. 16 is a time chart for illustrating an overview of inertial running control in the sixth embodiment. In Embodiment 6, it is a flowchart for demonstrating the inertial running control process performed by ECU.
- FIG. 17 is an overall block diagram of a vehicle according to a seventh embodiment using two motor generators as drive sources.
- FIG. 1 is an overall block diagram of a vehicle 100 according to the first embodiment of the present invention.
- vehicle 100 is an electric vehicle or a fuel cell vehicle that uses a rotating electric machine as a drive source.
- vehicle 100 includes a power storage device 110, a system main relay (SMR) 115, a drive control unit (PCU) 120, a motor generator 130, and a power transmission gear. 140, drive wheel 150, inclination detecting unit 200, and ECU (Electronic Control Unit) 300 which is a control device.
- PCU 120 includes a converter 121, an inverter 122, voltage sensors 180 and 185, and capacitors C1 and C2.
- the power storage device 110 is a power storage element configured to be chargeable / dischargeable.
- the power storage device 110 includes, for example, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a lead storage battery, or a power storage element such as an electric double layer capacitor.
- the power storage device 110 is connected to the PCU 120 via the power lines PL1 and NL1. Then, power storage device 110 supplies power for generating driving force of vehicle 100 to PCU 120. The power storage device 110 stores the electric power generated by the motor generator 130. The output of power storage device 110 is, for example, about 200V.
- the power storage device 110 is provided with a voltage sensor 170 and a current sensor 175.
- Voltage sensor 170 detects voltage VB of power storage device 110 and outputs the detection result to ECU 300.
- Current sensor 175 detects current IB input to and output from the power storage device, and outputs the detected value to ECU 300.
- the relay included in the SMR 115 has one end connected to the positive terminal and the negative terminal of the power storage device 110 and the other end connected to the power lines PL1 and NL1 connected to the PCU 120.
- SMR 115 switches between power supply and cutoff between power storage device 110 and PCU 120 based on control signal SE ⁇ b> 1 from ECU 300.
- Converter 121 performs voltage conversion between power lines PL1, NL1 and power lines PL2, NL1 based on control signal PWC from ECU 300.
- the inverter 122 is connected to the power lines PL2 and NL1. Inverter 122 converts DC power supplied from converter 121 into AC power based on control signal PWI from ECU 300 and drives motor generator 130.
- Capacitor C1 is provided between power lines PL1 and NL1, and reduces voltage fluctuation between power lines PL1 and NL1.
- Capacitor C2 is provided between power lines PL2 and NL1, and reduces voltage fluctuation between power lines PL2 and NL1.
- Voltage sensors 180 and 185 detect voltages VL and VH applied to both ends of capacitors C1 and C2, respectively, and output the detected values to ECU 300.
- the motor generator 130 is an AC rotating electric machine, for example, a permanent magnet type synchronous motor including a rotor in which a permanent magnet is embedded.
- the output torque of the motor generator 130 is transmitted to the drive wheels 150 via the power transmission gear 140 configured to include a speed reducer and a power split mechanism, thereby causing the vehicle 100 to travel.
- the motor generator 130 can generate power by the rotation of the drive wheels 150 during the regenerative braking operation of the vehicle 100. Then, the generated power is converted into charging power for power storage device 110 by PCU 120.
- a speed sensor 190 In order to detect the speed (vehicle speed) of the vehicle 100, a speed sensor 190 is provided in the vicinity of the drive wheel 150. Speed sensor 190 detects vehicle speed SPD based on the rotational speed of drive wheel 150 and outputs the detected value to ECU 300. Further, a rotation angle sensor (not shown) for detecting the rotation angle of motor generator 130 may be used as the speed sensor. In this case, ECU 300 indirectly calculates vehicle speed SPD based on a temporal change in the rotation angle of motor generator 130, a reduction ratio, and the like.
- the slope detection unit 200 detects the slope of the road surface on which the vehicle 100 is traveling. Then, the inclination detection unit 200 outputs the detected value SLP of the detected inclination to the ECU 300.
- the inclination detection unit 200 for example, an inclination sensor or a G sensor can be used.
- ECU 300 includes a CPU (Central Processing Unit), a storage device, and an input / output buffer, and inputs signals from each sensor and outputs control signals to each device and stores power.
- the device 110 and each device of the vehicle 100 are controlled. Note that these controls are not limited to processing by software, and can be processed by dedicated hardware (electronic circuit).
- ECU 300 generates and outputs a control signal for controlling PCU 120, SMR 115, and the like.
- one control device is provided as the ECU 300.
- a control device for the PCU 120, a control device for the power storage device 110, or the like is provided individually for each function or for each control target device. It is good also as a structure which provides a control apparatus.
- ECU 300 calculates a state of charge (SOC) of power storage device 110 based on detected values of voltage VB and current IB from voltage sensor 170 and current sensor 175 provided in power storage device 110.
- SOC state of charge
- ECU 300 receives a required torque TR determined based on an operation of an accelerator pedal (not shown) by a user from a host ECU (not shown). ECU 300 generates control signals PWC and PWI for converter 121 and inverter 122 based on torque requested TR from the user, and drives motor generator 130.
- ECU 300 receives a mode signal MOD set by the user.
- This mode signal MOD is a signal for instructing whether or not to execute inertial traveling control to be described later.
- the mode signal MOD is switched by a specific switch or setting on the operation screen. Alternatively, the mode signal MOD may be automatically set in response to the establishment of a specific condition.
- ECU 300 for example, operates to perform inertial running control when mode signal MOD is set to ON, and does not perform inertial running control when mode signal MOD is set to OFF. It operates so as to perform the running.
- inertial force is applied to the vehicle while the vehicle is running, if the driving force generated by the motor generator is made lower than the driving force required to maintain the vehicle speed while the vehicle is running, the vehicle speed gradually decreases.
- traveling using the inertia force of the vehicle (hereinafter also referred to as “inertia traveling”) is continued for a while.
- the motor generator Driving that repeats driving when acceleration driving with a high output power from the vehicle and inertial driving when the driving power of the motor generator is low (including when the driving power is zero) (Hereinafter, also referred to as “driving force changing operation”) is performed to improve the energy efficiency during traveling.
- the user request torque is substantially constant as described above.
- the vehicle 100 when the vehicle 100 is approaching a downhill from a flat road, the user request torque is constant. Even in such a case, the vehicle may be accelerated by the influence of gravity, and the vehicle speed may not be maintained within a predetermined allowable range.
- the driving force during acceleration traveling is flattened. Control is performed so that it is smaller than the road.
- decreasing the driving force is intended to include reducing the absolute value of the driving force, and also reducing the total driving force output during the period of acceleration travel. That is, it includes that the driving force generation time is shortened even though the driving force and the absolute value on the flat road are the same.
- FIG. 2 is a time chart for explaining an overview of the inertial traveling control in the first embodiment.
- the horizontal axis represents time
- the vertical axis represents road slope, vehicle speed SPD, motor generator output, required power from a user, charge / discharge power of a power storage device (battery), and power storage.
- the SOC of the device is shown.
- discharging electric power is represented by the positive value and charging electric power is represented by the negative value.
- the power required by the user is given as a substantially constant value.
- the driving force acting in the vehicle traveling direction is substantially increased due to the influence of gravity acting on the vehicle 100, and the deceleration decreases.
- the acceleration increases.
- the vehicle speed may increase as shown by the broken line W12 in FIG. 2, and the vehicle speed may not be maintained within the allowable range. If it does so, the distance between vehicles with a preceding vehicle may become short gradually and may cause a collision.
- the inertial traveling control according to the first embodiment basically, the acceleration traveling with motor generator 130 in the driving state and the inertial traveling with motor generator 130 in the stopped state are alternately repeated. .
- the inertial traveling control of the first embodiment is not applied, and the motor output PM0 is continuously output.
- the motor output and acceleration time when the motor generator performs acceleration traveling can be arbitrarily set.
- the acceleration time may be set to a predetermined time, and the motor output may be set such that the vehicle speed SPD can be increased from the lower limit value LL to the upper limit value UL within that period.
- the motor output used for acceleration may be set to a predetermined output, and the acceleration time may be achieved. If the acceleration time is too short, a large power is required, and torque shock may occur. On the other hand, if the motor output is too small, the acceleration time, that is, the drive time of the motor generator becomes long, and it becomes difficult to perform inertial running. Therefore, the acceleration time and the motor output during acceleration are appropriately set in consideration of drivability and energy efficiency.
- the setting of the motor output when traveling on the downhill may be set so that, for example, the acceleration equivalent to the acceleration when traveling on a flat road can be obtained by offsetting the influence of gravity.
- the sum of the acceleration traveling time and the inertia traveling time may be set to be equal between the flat road and the downhill.
- the driving force changing operation as shown in FIG. 2 is executed when the power required by the user is substantially constant.
- the driving force changing operation is not executed at the time of acceleration and deceleration when the required power from the user fluctuates.
- the driving force is continuously output from the motor generator 130 to accelerate the vehicle.
- the driving force from the motor generator 130 is stopped or decreased, and the vehicle is decelerated to a desired vehicle speed.
- FIG. 3 is a flowchart for illustrating an inertial traveling control process executed by ECU 300 in the first embodiment.
- Each step in the flowchart shown in FIG. 3 and FIGS. 5, 7, 9, 11, and 14 to be described later is realized by executing a program stored in ECU 300 in a predetermined cycle.
- dedicated hardware electronic circuit
- step S 100 determines in step (hereinafter, step is abbreviated as S) 100 whether inertial running control is selected based on mode signal MOD set by the user. Determine.
- mode signal MOD is set to OFF and inertial running control is not selected (NO in S100)
- the subsequent processing is skipped, and ECU 300 returns the processing to the main routine.
- mode signal MOD is set to ON and inertial running control is selected (YES in S100)
- the process proceeds to S110, and ECU 300 next receives a request from user based on required torque TR. It is determined whether or not the required power is substantially constant.
- the process proceeds to S120, and ECU 300 selects to execute the driving force changing operation.
- ECU 300 selects to execute the driving force changing operation.
- ECU 300 next determines in S121 whether or not a downhill has been detected based on signal SLP from inclination detecting unit 200.
- ECU 300 determines in S130 whether vehicle speed SPD has increased to upper limit value UL of the allowable speed range.
- the motor generator 130 is first stopped and the inertial running is performed. Therefore, the vehicle speed SPD is lower than the upper limit value UL and the vehicle speed SPD gradually decreases.
- the motor driving force is returned to the driving force in the case of a flat road through S121 and S122.
- the driving force changing operation as described above is executed so that the vehicle speed SPD is maintained within the allowable speed range.
- inertial traveling control when the vehicle travels on the downhill, control is performed such that the lower limit value of the allowable range of the vehicle speed is increased compared to the case of a flat road.
- control it is possible to increase the average vehicle speed from a flat road while maintaining the vehicle speed within an allowable range during downhill traveling. This makes it possible to adapt to the driver's feeling.
- FIG. 4 is a diagram for explaining an overview of the inertial traveling control in the second embodiment.
- the horizontal axis represents time
- the vertical axis represents road slope, vehicle speed SPD, motor generator output, requested power from the user, and charge / discharge power of the power storage device.
- the lower limit value LL of the allowable range of the vehicle speed is changed from LL0 in the case of a flat road to LL1 (> LL0). Be raised. Then, during the period from time t26 to t32, the inertial traveling control is executed so that the vehicle speed SPD falls within the range from the upper limit value UL to the lower limit value LL1. As a result, the average vehicle speed is slightly increased within the allowable range.
- the lower limit value LL is set as shown at times t32 to t36 in FIG. It is more preferable to gradually change from LL1 to LL0 with time.
- FIG. 5 is a flowchart for illustrating an inertial traveling control process executed by ECU 300 in the second embodiment.
- FIG. 5 is obtained by replacing steps S122 and S123 in the flowchart of FIG. 3 of the first embodiment with S122 # and S123 #, respectively.
- the description of the same steps as those in FIG. 3 will not be repeated.
- the process proceeds to S123 #, and ECU 300 drives the driving force that is reduced according to the slope as compared with the case of a flat road to the motor during acceleration traveling.
- the lower limit value of the allowable range of the vehicle speed is set to LL1 (> LL0) higher than that in the case of a flat road, and the process proceeds to S130.
- ECU 300 uses the driving force set in S122 # or S123 # to perform acceleration travel. This is performed (S142).
- ECU 300 stops motor generator 130 and performs inertial traveling (S140).
- ECU 300 When vehicle speed is between lower limit value LL and upper limit value UL (NO in S135), ECU 300 maintains the current motor state in S144, and acceleration running or inertial running is continued.
- Embodiment 3 when traveling downhill in inertial traveling control, the motor generator is regeneratively operated during inertial traveling, and the deceleration that is reduced by the influence of gravity acting on the vehicle is compensated by the braking force. Such control is performed.
- FIG. 6 is a time chart for explaining the outline of the inertial running control in the third embodiment.
- time is shown on the horizontal axis, and the slope of the road surface, the vehicle speed SPD, the output of the motor generator, the required power from the user, the charge / discharge power of the power storage device, and the acceleration / deceleration are shown on the vertical axis. It is.
- the acceleration / deceleration the acceleration is represented by a positive value and the deceleration is represented by a negative value.
- the downhill is When detected (time t48), the driving force in the acceleration traveling is reduced from PM1B to PM2B ( ⁇ PM1B).
- the motor generator is regeneratively operated with PMR during the inertial running period during downhill running.
- the motor driving force PMR at this time is determined based on the driving force that can complement the influence of gravity due to the downhill. Ideally, it is desirable that the motor driving force PMR is equal to the acceleration force due to gravity, but the motor driving force PMR is equal to the acceleration force due to gravity as long as there is no sense of incongruity in switching between acceleration traveling and inertial traveling. It may be slightly different.
- the absolute value of deceleration is smaller in inertial traveling during downhill traveling than in flat road traveling (broken line W21 in FIG. 6).
- the deceleration on the flat road and the deceleration on the downhill can be made substantially equal (solid line W20 in FIG. 6).
- the motor driving force PM2B so that the acceleration during acceleration traveling on the downhill is substantially equivalent to the acceleration on the flat road, a smoother feeling is given to the driver through the flat road and the downhill. And drivability can be improved.
- FIG. 7 is a flowchart for illustrating an inertial traveling control process executed by ECU 300 in the third embodiment.
- FIG. 7 is obtained by further adding steps S131 and S132 to the flowchart of FIG. 3 of the first embodiment. In FIG. 7, the description of the same steps as those in FIG. 3 will not be repeated.
- ECU 300 performs the acceleration traveling according to the slope.
- a driving force is set (S121 to S123).
- ECU 300 stops motor generator 130 and executes inertial operation (S140).
- the energy efficiency can be improved by performing the inertial traveling control in consideration of the downhill, and the deceleration during the inertial traveling when traveling on the downhill is adjusted. Can improve drivability.
- the motor generator when the vehicle is traveling on a downhill while executing the inertial traveling control, the time t48A to t49A and t50A to t51A in FIG. , T52A to t53A, and t54A to t55A, the motor generator is operated with the low driving force PMLB during the inertia traveling. This allows the deceleration during downhill travel to be comparable to the deceleration during flat road travel, so when the road surface changes from a flat road downhill, A torque shock or the like can be prevented.
- the change in deceleration can be obtained from, for example, a signal detected by an acceleration sensor (not shown) or calculation of time change in vehicle speed.
- FIG. 9 is a flowchart for illustrating an inertial traveling control process executed by ECU 300 in the fourth embodiment.
- FIG. 9 is obtained by replacing steps S131 and S132 in the flowchart of FIG. 7 described in the third embodiment with S131A and S132A. In FIG. 9, the description of the same steps as those in FIGS. 3 and 7 will not be repeated.
- the motor generator is stopped during inertial traveling (in the third and fourth embodiments, during inertial traveling on a flat road).
- inertial traveling in the third and fourth embodiments, during inertial traveling on a flat road.
- the motor generator instead of stopping the motor generator during inertia traveling, it is possible to operate with a low driving force. Good.
- the motor generator may be operated with the same driving force PMLC when traveling on a flat road and traveling on a downhill road, but as in the third embodiment or the fourth embodiment.
- a driving force that cancels out fluctuations in deceleration may be used.
- FIG. 11 is a flowchart for illustrating an inertia traveling control process executed by ECU 300 in the fifth embodiment having an engine as a drive source.
- FIG. 11 shows that steps S122, S123, S140, S142, S144, S146, and S148 in the flowchart of FIG. 3 of the first embodiment are replaced with S122A, S123A, S140A, S142A, S144A, S146A, and S148A, respectively. It has become.
- the processing of each replaced step is different only in that the driving force is output from the engine instead of the motor generator, and the other processing contents are the same as those in FIG.
- the inertial traveling control is selected and the user request power is constant
- the engine is driven when the vehicle speed decreases to the lower limit value.
- acceleration traveling is executed and the vehicle speed increases to the upper limit value
- the engine is stopped and inertial traveling is executed.
- the engine output during acceleration traveling is set smaller than that on a flat road.
- the inertia traveling control is applied, and the engine output on the downhill is decreased, thereby improving the fuel efficiency and preventing the vehicle speed from increasing on the downhill.
- the drive source is an engine
- the same configuration as in the second to fourth embodiments can be applied.
- the engine it is possible to set the engine to a low output state such as an idling state without stopping the engine during inertial running.
- the drive source is an engine
- cranking of the engine is necessary at the time of starting. Therefore, if the engine is stopped at every inertia traveling, energy efficiency may be deteriorated due to energy required for starting. Therefore, in the case where the engine operation is continued even in the inertia traveling, the energy is lower than the energy used for starting the engine, it may be advantageous to perform the control as shown in FIG.
- Embodiment 6 describes a case where inertial traveling control is applied to a vehicle that travels using driving forces from a plurality of driving sources.
- FIG. 12 is an overall block diagram of a vehicle 100A according to the sixth embodiment.
- the vehicle 100A is a hybrid vehicle that uses a motor generator and an engine that is an internal combustion engine as drive sources.
- the PCU 120 in FIG. 1 is replaced with a PCU 120A, and motor generators 130A and 130B and an engine 160 are provided as drive sources instead of the motor generator 130.
- motor generators 130A and 130B and an engine 160 are provided as drive sources instead of the motor generator 130.
- FIG. 12 the description of the same elements as those in FIG. 1 will not be repeated.
- PCU 120A includes a converter 121, inverters 122A and 122B, capacitors C1 and C2, and voltage sensors 180 and 185.
- Inverters 122A and 122B are connected in parallel to converter 121 via power lines PL2 and NL1.
- Inverter 122A is controlled by control signal PWI1 from ECU 300, converts DC power from converter 121 to AC power, and drives motor generator 130A (hereinafter also referred to as “MG1”). Inverter 122 ⁇ / b> A converts AC power generated by motor generator 130 ⁇ / b> A into DC power, and charges power storage device 110 via converter 121.
- Inverter 122B is controlled by control signal PWI2 from ECU 300, converts DC power from converter 121 to AC power, and drives motor generator 130B (hereinafter also referred to as “MG2”). Inverter 122 ⁇ / b> B converts AC power generated by motor generator 130 ⁇ / b> B into DC power, and charges power storage device 110 via converter 121.
- Each output shaft of motor generators 130A and 130B is coupled to a power transmission gear 140A configured to include a power split mechanism such as a planetary gear. Then, the driving force from motor generators 130 ⁇ / b> A and 130 ⁇ / b> B is transmitted to driving wheel 150.
- a power transmission gear 140A configured to include a power split mechanism such as a planetary gear.
- motor generators 130A and 130B are also coupled to engine 160 through power transmission gear 140A.
- Engine 160 is controlled by control signal DRV from ECU 300.
- the driving force generated from engine 160 is transmitted to driving wheel 150 and motor generators 130A and 130B via power transmission gear 140A.
- ECU 300 cooperatively controls the driving forces generated by motor generators 130A and 130B and engine 160 to cause the vehicle to travel.
- motor generator 130A is used as a starter motor for starting engine 160, and is exclusively used as a generator that is driven by engine 160 to generate electric power.
- Motor generator 130 ⁇ / b> B is exclusively used as an electric motor for driving drive wheels 150 using electric power from power storage device 110.
- FIG. 12 shows an example of a configuration in which two motor generators and one engine are provided, but the number of motor generators is not limited to this. For example, even if there is only one motor generator, Good. Or the case where more than two motor generators are provided may be sufficient.
- FIG. 13 is a time chart for explaining the outline of the inertial traveling control in the sixth embodiment. Time is shown on the horizontal axis, and the slope of the road surface, vehicle speed SPD, motor generator (MG2) is shown on the vertical axis. ) Output, engine output, required power from the user, and charge / discharge power of the power storage device.
- the driving force during acceleration traveling in the inertial traveling control is generated by the driving force from motor generator 130B and the driving force from engine 160.
- the sum of driving force PM1D from motor generator 130B and driving force PE1D from engine 160 is necessary to maintain the vehicle speed. Is set to be larger than the driving force PM0D. Further, after time t88 when traveling downhill, the sum of the driving force PM2D from motor generator 130B and the driving force PE2D from engine 160 is made smaller than the total driving force when traveling on a flat road. Is set.
- the ratio of the driving force from motor generator 130B to the driving force from engine 160 during acceleration traveling is appropriately determined so that the total energy efficiency is increased in consideration of the energy efficiency of motor generator 130B and engine 160. Is set.
- engine 160 since engine 160 is started every time acceleration travels, engine 160 is cranked by motor generator 130A (MG1) immediately before acceleration travel is executed.
- MG1 motor generator 130A
- FIG. 14 is a flowchart for illustrating an inertial traveling control process executed by ECU 300 in the sixth embodiment.
- steps S122, S123, S140, S142, S144, S146, and S148 in the flowchart described in FIG. 3 of the first embodiment are replaced with S122B, S123B, S140B, S142B, S144B, S146B, and S148B, respectively. It has become a thing. In FIG. 14, the description of the same steps as those in FIG. 3 will not be repeated.
- S122B, S123B, S140B, S142B, S144B, S146B, and S148B in FIG. 14 are the same as motor generator 130B (S122, S123, S140, S142, S144, S146, and S148 in FIG. In addition to MG2), a driving condition for the engine 160 is added.
- ECU 300 determines whether the motor generator during acceleration travels according to whether the road surface is a downhill or not.
- the driving force of 130B and engine 160 is set. Specifically, ECU 300 selects the driving force for traveling on a flat road (S122B) when it is not a downhill (NO at S121), and if it is a downhill (YES at S121) In consideration of the influence, the driving powers of motor generator 130B and engine 160 are set so that the driving power is smaller than that on a flat road (S123B).
- ECU 300 when vehicle speed SPD decreases to lower limit value LL (YES in S135), drives MG2 and engine 160 using the driving force set in S122B or S123B, and executes accelerated traveling (S142B).
- ECU 300 stops MG2 and engine 160 and executes inertial running (S140B).
- ECU 300 when the user request power fluctuates (NO in S110) and the driving force change operation is interrupted (S125), ECU 300 is accelerating (YES in S127), MG2 or MG2 and the engine Accelerate using 160 together (S146B). If the vehicle is decelerating (NO in S127), ECU 300 stops engine 160 and decelerates MG2 by stopping or switching to a low output state (S148B). In the case of deceleration, the MG2 regeneration operation may be executed to decelerate.
- the case where the driving force of both MG2 and engine 160 is made smaller than that on a flat road when traveling downhill has been described as an example.
- the energy efficiency of MG2 and engine 160 In consideration of the responsiveness of the driving force and the like, the driving force of either MG2 or engine 160 may be reduced. In a specific case or at a specific timing, the total driving force may be output by either MG2 or engine 160.
- either MG2 or engine 160, or both MG2 and engine 160 may be operated with a low driving force during inertial running.
- any one of the second to fourth embodiments, the combination of the second and third embodiments, or the combination of the second and fourth embodiments is also possible to apply.
- the hybrid vehicle provided with the engine and the motor generator as a plurality of drive sources has been described as an example.
- the present invention may be configured as a plurality of drive sources, for example, as shown in FIG.
- the present invention can also be applied to a vehicle having another configuration such as an electric vehicle having a twin motor configuration capable of traveling using driving forces from two motor generators.
- Vehicle 100B in FIG. 15 has a configuration in which engine 160 is not equipped in vehicle 100A in FIG. 12, and vehicle 100B travels using the driving forces of both motor generator 130A (MG1) and motor generator 130B (MG2). To do.
- MG1 motor generator 130A
- MG2 motor generator 130B
- power storage device 110 cannot be charged using motor generator 130A (MG1) as in the sixth embodiment, but in FIG. 13 in the sixth embodiment, the driving force of engine 160 is MG1. It is possible to perform a driving force changing operation by replacing the output.
- MG1 motor generator 130A
- MG1 is also used as an electric motor instead of a generator, and even when traveling using driving forces generated by three driving sources of MG1, MG2 and engine 160, The present invention can be applied.
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Abstract
Description
好ましくは、車両は、車両の走行駆動力を発生する他の駆動源をさらに備える。制御装置は、他の駆動源について、第2のレベルの駆動力を発生させる第3の状態と、第3の状態よりも小さい駆動力を発生させる第4の状態とを切換える駆動力変更運転を実行する。
好ましくは、駆動源は、回転電機またはエンジンのいずれかである。
図1は、本発明の実施の形態1に従う車両100の全体ブロック図である。以下で詳細に説明されるように、車両100は、駆動源として回転電機を用いる電気自動車あるいは燃料電池車である。
実施の形態1においては、慣性走行制御において、路面が平坦路から下り坂に変化した場合に、加速走行時のモータジェネレータの駆動力を低減することによって、平坦路と下り坂での車速がほぼ同じレベルに維持されるように制御する構成について説明した。
上述のように、路面が平坦路から下り坂になった場合には、車両に作用する重力の影響により減速度が小さくなる。実施の形態1のように、慣性走行制御の際に、下り坂における加速走行時のモータ駆動力を平坦路に比べて減少する場合、重力による加速走行時の減速度の減少については、モータ駆動力を適切に調整することで補完することが可能である。しかしながら、モータジェネレータを停止する慣性走行時には、減少した減速度を補完することができないので、慣性走行を実行する時間が長くなることによって運転者に違和感を与える可能性がある。
実施の形態3においては、車両が下り坂を走行する際に、重力の影響によって慣性走行中に減速度が低下する場合について説明した。
実施の形態1~4は、モータジェネレータを駆動源とする電気自動車を例として説明したが、上述の駆動力変更制御は、駆動源としてエンジンを有する車両においても適用可能である。
実施の形態1~5では、駆動源としてモータジェネレータ、あるいはエンジンが単独で設けられる場合における慣性走行制御について説明した。
上記の実施の形態6においては、複数の駆動源としてエンジンとモータジェネレータとが備えられるハイブリッド車両を例として説明したが、本発明は、複数の駆動源として、たとえば、図15に示されるような、2つのモータジェネレータからの駆動力を用いて走行することが可能なツインモータ構成の電気自動車などの、他の構成を有する車両にも適用可能である。
Claims (20)
- 車両であって、
前記車両(100)の走行駆動力を発生する駆動源(130,130B,160)と、
前記駆動源(130,130B,160)を制御するための制御装置(300)と、
路面の斜度を検出するための斜度検出部(200)とを備え、
前記制御装置(300)は、前記駆動源(130,130B,160)について、第1のレベルの駆動力を発生させる第1の状態と、前記第1の状態よりも駆動力を小さくした第2の状態とを切換えながら前記車両(100)を走行させる駆動力変更運転を実行し、
前記制御装置(300)は、前記斜度検出部(200)により検出された斜度に基づいて、前記車両(100)が下り坂を走行していることが認識された場合は、前記車両(100)が平坦路を走行している場合よりも、前記第1の状態における駆動力を小さく設定する、車両。 - 前記制御装置(300)は、ユーザからの要求駆動力の変化が所定範囲内の場合に、駆動力変更運転を実行する、請求項1に記載の車両。
- 前記制御装置(300)は、駆動力変更運転の実行中は、前記車両(100)の速度が許容範囲内に維持されるように、前記第1および第2の状態を切換える、請求項1に記載の車両。
- 前記制御装置(300)は、前記車両(100)の速度が前記許容範囲の下限値まで低下したことに応答して前記第1の状態に切換え、前記車両(100)の速度が前記許容範囲の上限値まで上昇したことに応答して前記第2の状態に切換える、請求項3に記載の車両。
- 前記制御装置(300)は、前記車両(100)が下り坂を走行している場合は、前記車両(100)が平坦路を走行している場合よりも、前記下限値を高く設定する、請求項4に記載の車両。
- 前記制御装置(300)は、前記車両(100)が下り坂から平坦路へ復帰した場合は、前記下限値を時間とともに緩やかに低下させる、請求項5に記載の車両。
- 前記制御装置(300)は、前記車両(100)が下り坂を走行している場合は、前記車両(100)が平坦路を走行している場合よりも、前記第2の状態における駆動力を大きく設定する、請求項1に記載の車両。
- 前記駆動源は回転電機(130,130B)であり、
前記制御装置(300)は、前記車両(100)が下り坂を走行している場合は、前記第2の状態において、前記回転電機(130,130B)の回生動作を行なう、請求項1に記載の車両。 - 前記制御装置(300)は、下り方向の前記斜度の大きさが大きいほど、前記第1の状態における駆動力をより小さく設定する、請求項1に記載の車両。
- 前記第1の状態における駆動力は、前記車両(100)の速度を維持することが可能な一定出力の基準駆動力よりも大きく設定され、
前記第2の状態における駆動力は、前記基準駆動力よりも小さく設定される、請求項1に記載の車両。 - 前記制御装置(300)は、前記第2の状態においては、前記駆動源(130,130B,160)からの駆動力の発生を停止する、請求項10に記載の車両。
- 前記車両(100)は、前記第2の状態においては、主に前記車両(100)の慣性力によって走行する、請求項10に記載の車両。
- 前記車両(100)の走行駆動力を発生する他の駆動源(130A,130B,160)をさらに備え、
前記制御装置(300)は、前記他の駆動源(130A,130B,160)について、第2のレベルの駆動力を発生させる第3の状態と、前記第3の状態よりも小さい駆動力を発生させる第4の状態とを切換える駆動力変更運転を実行する、請求項1に記載の車両。 - 前記制御装置(300)は、前記駆動源(130B;160)が前記第1の状態の場合に前記他の駆動源(160,130A;130B)を前記第3の状態にするとともに、前記駆動源(130B;160)が前記第2の状態の場合に前記他の駆動源(160,130A;130B)を前記第4の状態にする、請求項13に記載の車両。
- 前記制御装置(300)は、前記車両(100)が下り坂を走行している場合は、前記車両(100)が平坦路を走行している場合よりも、前記他の駆動源(160,130A;130B)について、前記第3の状態における駆動力を小さく設定する、請求項13に記載の車両。
- 前記第1の状態における前記駆動源(130B;160)の駆動力と前記第3の状態における前記他の駆動源(160,130A;130B)の駆動力との和は、前記車両(100)の速度を維持することが可能な一定出力の基準駆動力よりも大きく設定され、
前記第2の状態における前記駆動源(130B,160)の駆動力と前記第4の状態における前記他の駆動源(160,130A;130B)の駆動力との和は、前記基準駆動力よりも小さく設定される、請求項13に記載の車両。 - 前記駆動源および前記他の駆動源の一方は、回転電機(130B)であり、
前記駆動源および前記他の駆動源の他方は、エンジン(160)である、請求項13に記載の車両。 - 前記駆動源および前記他の駆動源の双方は、回転電機(160A,160B)である、請求項13に記載の車両。
- 前記駆動源は、回転電機(130,130B)またはエンジン(160)のいずれかである、請求項1に記載の車両。
- 走行駆動力を発生する駆動源(130,130B,160)および路面の斜度を検出するための斜度検出部(200)を有する車両の制御方法であって、
前記駆動源(130,130B,160)を、所定のレベルの駆動力を発生させる第1の状態にするステップと、
前記駆動源(130,130B,160)を、前記第1の状態よりも駆動力を小さくした第2の状態にするステップと、
前記第1および第2の状態を切換えながら前記車両(100)を走行させる駆動力変更運転を実行するステップと、
前記斜度検出部(200)により検出された斜度に基づいて、前記車両(100)が下り坂を走行していることが認識された場合は、前記車両(100)が平坦路を走行している場合よりも、前記第1の状態における駆動力を小さく設定するステップとを備える、車両の制御方法。
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