JP2011259672A - Vehicle control apparatus and vehicle control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a temperature of a power storage device at an appropriate temperature after the completion of charging by an external power source.SOLUTION: An ECU executes a program including: a step (S102) that calculates a charging required time Ta when the reservation of a starting time is completed (YES in S100); a step (S104) that determines a provisional charging time; a step (S108) that determines a charging method when a present time reaches a provisional starting time (YES in S106); a step (S110) that determines a charge starting time; a step (S114) that starts charging control when a present time reaches the charge starting time (YES in S112); a step (S120) that operates a cooling fan when charging is completed (YES in S116) and the operation of the cooling fan is required (YES in S118); and a step (S124) that stops the operation of the cooling fan when a present time reaches a charge finish time (YES in S122).

Description

  TECHNICAL FIELD The present invention relates to control of a vehicle equipped with a power storage device that can be charged by an external power source, and in particular, charging power and a power storage device cooling device for ensuring that the temperature of the power storage device is within an appropriate temperature range at the end of charging. Related to control.

  In recent years, as one of countermeasures for environmental problems, a hybrid vehicle, an electric vehicle, or the like that travels by driving force from a motor has attracted attention. Such a vehicle is equipped with a power storage device such as a secondary battery, and a technique for completing the charging at a charge end time set using a commercial power source supplied to the home or the like for these power storage devices is known. It is.

  As such a technique, for example, Japanese Patent Laying-Open No. 2009-065727 (Patent Document 1) discloses an electric vehicle that can enhance user convenience in an electric vehicle equipped with a power storage device that can be charged by an external power source. Is disclosed. The electric vehicle includes a power storage device for accumulating electric power used to generate driving force of the electric vehicle, a charging device that charges the power storage device using power supplied from an external power source, a lighting device, and a start reservation time And a start time setting unit that receives at least one of the scheduled end time and sets the charge start time, and maintains the state of the lighting device in the first state between the time when the charge start time is set and the charge start time. A start instruction unit that outputs a start instruction for starting charging of the power storage device when the current time reaches the charging start time, and the charging device is activated in response to the start instruction, and the state of the lighting device is It is determined whether or not a charging control unit for changing from the state 1 to the second state and the charging end condition of the power storage device are satisfied, and when the charging end condition is satisfied, the operation of the charging device is ended. Yo It instructs the charge control unit, and changes the state of the lighting device from the second state to the third state and a charge termination unit. A start instruction | indication part produces | generates the state by which the power consumption of the lighting device was suppressed rather than the 2nd state as a 1st state.

  According to the electric vehicle disclosed in the above publication, the convenience of the user who uses the electric vehicle equipped with the power storage device that can be charged by the external power source can be enhanced.

JP 2009-065727 A

  However, the output characteristics of the power storage device depend on the temperature, and when the temperature of the power storage device is lower than the appropriate temperature range after completion of charging by the external power supply, the temperature of the power storage device is within the appropriate temperature range. There is a problem in that the output of the power storage device is lower than in the case of. In addition, if the temperature of the power storage device is higher than the appropriate temperature range after the charging by the external power supply is completed, it is necessary to operate the cooling device to cool the power storage device immediately after starting the vehicle. This consumes electric power, which may reduce fuel consumption.

  In the electric vehicle disclosed in the above-mentioned publication, such a problem is not taken into consideration and cannot be solved.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a vehicle control device and a vehicle control method for setting the temperature of the power storage device to an appropriate temperature after completion of charging by an external power source. It is to be.

  A vehicle control device according to an aspect of the present invention is a vehicle control device for a vehicle equipped with a power storage device and a rotating electric machine that receives power supply from the power storage device and generates a driving force. The power storage device can be charged using an external power supply outside the vehicle. The vehicle control device includes a temperature detection unit for detecting the temperature of the power storage device, a remaining capacity detection unit for detecting the remaining capacity of the power storage device, and charging using an external power source based on a user request When the charging end time is set, the temperature of the power storage device becomes a temperature within a predetermined range at the charging end time, and the remaining capacity of the power storage device becomes the remaining capacity corresponding to the fully charged state. And a control unit for charging the power storage device.

  Preferably, the vehicle further includes a cooling device for cooling the power storage device. When it is estimated that the temperature of the power storage device becomes larger than a predetermined range when the charging of the power storage device is completed, the control unit, after completing the charging before the charging end time, The cooling device is operated so that the temperature of the power storage device is within a predetermined range.

  More preferably, when the control unit operates the cooling device before the charging end time, the control unit operates the cooling device with the electric power supplied from the external power supply as an upper limit.

  More preferably, when the temperature of the power storage device is the first temperature, the control unit determines that the first value determined as the charging power is a second temperature where the temperature of the power storage device is higher than the first temperature. The charging power is determined to be larger than the second value determined as the charging power.

  More preferably, the control unit is configured such that the third value determined as the charging power when the remaining capacity of the power storage device is the first amount is a second value in which the remaining capacity of the power storage device is larger than the first amount. The charging power is determined to be larger than the fourth value determined as the charging power in the case of the quantity.

  A vehicle control method according to another aspect of the present invention is a vehicle control method for a vehicle equipped with a power storage device and a rotating electrical machine that receives power supply from the power storage device and generates a driving force. The power storage device can be charged using an external power supply outside the vehicle. In this vehicle control method, the step of detecting the temperature of the power storage device, the step of detecting the remaining capacity of the power storage device, and the charging end time by charging using an external power source based on a user request are set. And charging the power storage device so that the temperature of the power storage device is within a predetermined range at the charging end time and the remaining capacity of the power storage device becomes a remaining capacity corresponding to the fully charged state. .

It is a figure showing the whole hybrid vehicle composition in this embodiment. It is a functional block diagram of ECU which is a control device for vehicles concerning this embodiment. It is a figure which shows the relationship between SOC, battery temperature, and charging current. It is a figure which shows the relationship between battery temperature, external temperature, and charging current. It is a flowchart which shows the control structure of the program performed by ECU which is the vehicle control apparatus which concerns on this Embodiment. It is a timing chart (the 1) which shows operation | movement of ECU which is the control apparatus for vehicles which concerns on this Embodiment. It is a timing chart (the 2) which shows operation | movement of ECU which is a control apparatus for vehicles which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the vehicle 40 includes an engine 2, a power split mechanism 4, motor generators (hereinafter referred to as MG) 6 and 10, a transmission gear 8, a drive shaft 12, and wheels 14. Including. The vehicle 40 includes a power storage device 16, power converters 18, 20, a charger 22, a charging port 24, an ECU (Electronic Control Unit) 26, a storage unit 27, a cooling fan 28, and a voltage sensor. 34, a current sensor 36, and a temperature sensor 38.

  The vehicle 40 is a hybrid vehicle that uses the engine 2 and the MG 10, which is a driving motor that receives a supply of electric power from the power storage device 16 and generates a vehicle driving force, as power sources. The vehicle 40 may be a hybrid vehicle that uses the engine 2 only for power generation. Vehicle 40 is not particularly limited to a hybrid vehicle, and may be an electric vehicle that uses only a rotating electrical machine as a drive source and is equipped with a power storage device that can be charged using a power source external to the vehicle.

  Power split device 4 is coupled to engine 2, MG 6, and transmission gear 8 to distribute power among them. For example, a planetary gear having three rotation shafts of a sun gear, a planetary carrier, and a ring gear can be used as the power split mechanism 4, and these three rotation shafts are connected to the rotation shafts of the engine 2, the MG 6, and the transmission gear 8, respectively. . Further, the rotation shaft of MG 10 is connected to the rotation shaft of transmission gear 8. That is, MG 10 and transmission gear 8 have the same rotation shaft, and the rotation shaft is connected to the ring gear of power split mechanism 4.

  The kinetic energy generated by the engine 2 is distributed to the MG 6 and the transmission gear 8 by the power split mechanism 4. That is, the engine 2 is incorporated in the vehicle 40 as a power source that drives the transmission gear 8 that transmits power to the drive shaft 12 and drives the MG 6. The MG 6 is incorporated in the vehicle 40 so as to operate as a generator driven by the engine 2 and to operate as an electric motor that can start the engine 2. The MG 10 is incorporated in the vehicle 40 as a power source that drives the transmission gear 8 that transmits power to the drive shaft 12.

  The power storage device 16 is a DC power source that can be charged and discharged, and is, for example, a secondary battery such as nickel metal hydride or lithium ion. The power storage device 16 supplies power to the power converters 18 and 20.

  The power storage device 16 is charged by receiving power from the power converter 18 when the MG 6 generates power. The power storage device 16 is charged by receiving power from the power converter 20 when the MG 10 generates power. Furthermore, the power storage device 16 is charged by receiving power from the charger 22 when charging from a power supply 30 outside the vehicle connected to the charging port 24 (hereinafter also referred to as “external power supply 30”).

  It is to be noted that a large-capacity capacitor can also be employed as power storage device 16, and a power buffer capable of temporarily storing power generated by MG 6, 10 or power from external power supply 30 and supplying the stored power to MG 6, 10. Anything can be used.

  Voltage VB of power storage device 16 is detected by voltage sensor 34. The voltage sensor 34 outputs a signal representing the detected voltage VB to the ECU 26. Current IB of power storage device 16 is detected by current sensor 36. The current sensor 36 outputs a signal representing the detected current IB to the ECU 26. The temperature TB of the power storage device 16 is detected by the temperature sensor 38. The temperature sensor 38 outputs a signal representing the detected temperature TB to the ECU 26. The outside air temperature of the vehicle 40 is detected by the outside air temperature sensor 42. The outside air temperature sensor 42 outputs a signal representing the detected outside air temperature to the ECU 26.

  ECU 26 performs SOC (State Of Charge) indicating the remaining capacity of power storage device 16 based on voltage VB input from voltage sensor 34, current IB input from current sensor 36, and temperature TB input from temperature sensor 38. calculate. The SOC represents the state of charge from the upper limit value to the lower limit value of the remaining capacity of the power storage device 16 as 0 to 100%. For example, the SOC may be calculated based on the open circuit voltage (OCV) of the power storage device 16, or may be calculated based on the relationship between the charge amount and the discharge amount, and a known technique may be used. . The ECU 26 stores the calculated SOC in the storage unit 27.

  Based on signal PWM <b> 1 from ECU 26, power converter 18 converts the power generated by MG 6 into DC power and outputs it to power storage device 16. Based on signal PWM2 from ECU 26, power converter 20 converts the DC power supplied from power storage device 16 into AC power and outputs the AC power to MG10.

  Power converter 18 converts the DC power supplied from power storage device 16 into AC power and outputs it to MG 6 based on signal PWM1 when engine 2 is started. In addition, power converter 20 converts the power generated by MG 10 into DC power and outputs it to power storage device 16 based on signal PWM 2 when the vehicle is braked or when acceleration on a downward slope is reduced.

  MG6 and 10 are AC motors, for example, three-phase AC synchronous motors in which permanent magnets are embedded in a rotor. The MG 6 converts the kinetic energy generated by the engine 2 into electric energy and outputs it to the power converter 18. Further, MG 6 generates driving force by the three-phase AC power received from power converter 18 and starts engine 2.

  MG 10 generates driving torque of the vehicle by three-phase AC power received from power converter 20. Further, the MG 10 converts mechanical energy stored in the vehicle as kinetic energy or positional energy into electric energy and outputs the electric energy to the power converter 20 when the vehicle is braked or when acceleration is reduced on a downward slope.

  The engine 2 converts thermal energy generated by fuel combustion into kinetic energy of a moving element such as a piston or a rotor, and outputs the converted kinetic energy to the power split mechanism 4. For example, if the motion element is a piston and the motion is a reciprocating motion, the reciprocating motion is converted into a rotational motion via a so-called crank mechanism, and the kinetic energy of the piston is transmitted to the power split mechanism 4.

  Based on signal PWM 3 from ECU 26, charger 22 converts electric power from external power supply 30 applied to charging port 24 into a voltage level of power storage device 16 and outputs the voltage level to power storage device 16. The charging port 24 is an external charging interface for supplying power from the external power supply 30 to the power storage device 16.

  The cooling fan 28 is a cooling device for cooling the power storage device 16. The cooling fan 28 operates by receiving a control signal from the ECU 26. The cooling fan 28 changes the operation amount according to the magnitude of the supplied power. The electric power supplied to the cooling fan 28 is controlled by the ECU 26. The cooling device for cooling power storage device 16 is not particularly limited to cooling fan 28. For example, instead of cooling fan 28, water cooling for cooling power storage device 16 using cooling water is used. A type of cooling device may be used.

  ECU 26 generates signals PWM1 and PWM2 for driving power converters 18 and 20, respectively, and outputs the generated signals PWM1 and PWM2 to power converters 18 and 20, respectively. When ECU 26 receives signal CHRG requesting charging of power storage device 16 by charger 22, ECU 26 generates signal PWM 3 for driving charger 22, and outputs the generated signal PWM 3 to charger 22. The storage unit 27 stores and holds the SOC of the power storage device 16 input from the ECU 26, a charge end time described later, and the like.

  Based on torque command values TR1 and TR2 of MG6 and 10, motor currents MCRT1 and MCRT2 and rotor rotational positions θ1 and θ2, and voltage VB of power storage device 16, ECU 26 drives signals MG1 and PWM2 to drive MG6 and 10, respectively. PWM2 is generated, and the generated signals PWM1 and PWM2 are output to power converters 18 and 20, respectively.

  The torque command values TR1 and TR2 are calculated by a torque calculation unit (not shown) of the ECU 26 based on the accelerator opening and the vehicle speed. Each of motor currents MCRT1, MCRT2, rotor rotational positions θ1, θ2, and voltage VB is detected by a sensor (not shown).

  Further, the ECU 26 includes a timer 25. The ECU 26 acquires the value counted by the timer 25 and grasps the current time.

  In vehicle 40 having the above-described configuration, the output characteristics of power storage device 16 depend on temperature, and the temperature of power storage device 16 is lower than the appropriate temperature range after charging by external power supply 30 is completed. The output of the power storage device 16 may be lower than when the temperature of the power storage device 16 is within a suitable temperature range. Further, when the temperature of the power storage device 16 is higher than the appropriate temperature range after the charging by the external power supply 30 is completed, it is necessary to operate the cooling fan 28 to cool the power storage device 16 immediately after the vehicle 40 is started. In addition, since the electric power is consumed by the operation of the cooling fan 28, the fuel consumption may deteriorate.

  Therefore, in the present embodiment, when the charging end time by charging using external power supply 30 is set based on the user's request, ECU 26 determines the temperature of power storage device 16 in advance at the charging end time. The power storage device 16 is charged so that the temperature is within the above range and the remaining capacity of the power storage device 16 becomes a remaining capacity corresponding to the fully charged state.

  ECU 26 completes charging before the charging end time when it is estimated that the temperature of power storage device 16 will be larger than a predetermined range when charging of power storage device 16 is completed. Then, the cooling fan 28 is operated so that the temperature of the power storage device 16 falls within a predetermined range.

  In particular, when the cooling fan 28 is operated before the charging end time, the ECU 26 operates the cooling fan 28 with the electric power supplied from the external power supply 30 as an upper limit.

  Further, the ECU 26 charges when the first value determined as the charging power when the temperature of the power storage device 16 is the first temperature is the second temperature where the temperature of the power storage device 16 is higher than the first temperature. The charging power is determined to be larger than the second value determined as the power.

  Further, the ECU 26 determines that the third value determined as the charging power when the remaining capacity of the power storage device 16 is the first amount is a second amount in which the remaining capacity of the power storage device 16 is larger than the first amount. In this case, the charging power is determined to be larger than the fourth value determined as the charging power.

  FIG. 2 shows a functional block diagram of ECU 26 that is the vehicle control apparatus according to the present embodiment. The ECU 26 includes a reservation determination unit 100, a required time calculation unit 102, a provisional start time determination unit 104, a first start determination unit 106, a charging method determination unit 108, a start time determination unit 110, and a second start determination. Unit 112, charging control unit 114, and cooling fan control unit 116.

  The reservation determination unit 100 determines whether or not the charging end time is reserved. The user inputs a desired start time to the ECU 26 using an input device in order to reserve the start time of the vehicle 40. The ECU 26 stores the desired start time input from the user in the storage unit 27 as the charge end time. Examples of the input device include a touch panel and a voice input device. The reservation determination unit 100 determines that the charging end time is reserved when the storage unit 27 stores the time in the storage area for storing the charging end time. For example, the reservation determination unit 100 may turn on the reservation determination flag when the charging end time is reserved.

  The required time calculation unit 102 is time required for charging until the SOC of the power storage device 16 reaches the SOC corresponding to the fully charged state when the reservation determination unit 100 determines that the charging end time is reserved. Hereinafter, it is described as the required time). The required time calculation unit 102 calculates the required time in consideration of factors that increase the charging time such as when the outside air temperature or the temperature of the power storage device 16 is high.

  The required time calculation unit 102 calculates the required time based on, for example, the temperature TB input from the temperature sensor 38, the SOC read from the storage unit 27, and the map. The map is a map showing the relationship between the temperature TB, the SOC, and the required time. In addition, the required time calculation unit 102 may calculate the required time using a mathematical formula or a table instead of the map. The necessary time calculation unit 102 may calculate the necessary time based on the outside air temperature input from the outside air temperature sensor 42 in addition to the temperatures TB and SOC. The required time becomes shorter as the SOC becomes higher, and becomes longer as the SOC becomes lower. Therefore, the required time calculation unit 102 calculates the required time when the SOC is a second value higher than the first value than the required time calculated when the SOC is the first value. The required time is calculated so that.

  Further, the higher the temperature TB and the outside air temperature, the longer the time required for cooling using the cooling fan 28 after completion of charging, and the lower the temperature TB and the outside temperature, the time required for cooling using the cooling fan 28 after completion of charging. Becomes shorter. Therefore, the required time calculation unit is the second temperature at which the temperature TB (or outside air temperature) is higher than the first temperature than the necessary time when the temperature TB (or outside air temperature) is the first temperature. The required time is calculated so that the required time in a certain case becomes longer.

  Note that the required time calculation unit 102 may calculate the required time, for example, when the reservation determination flag is turned on.

  The provisional start time determination unit 104 determines a provisional time for starting charging (hereinafter referred to as provisional start time) based on the necessary time calculated by the necessary time calculation unit 102. For example, when the time from the current time to the charging end time is longer than the required time, the temporary start time determining unit 104 determines the time calculated by subtracting the required time from the charging end time as the temporary start time.

  On the other hand, the provisional start time determination unit 104 determines the current time as the provisional start time when the time from the current time to the charge end time is equal to or less than the necessary time. For example, when the provisional start time is determined, the provisional start time determination unit 104 causes the storage unit 27 to store the determined provisional start time.

  The first start determination unit 106 determines whether or not the current time is a provisional start time. The first start determination unit 106 determines that the current time is the provisional start time when the current time based on the count value from the timer 25 matches the provisional start time stored in the storage unit 27. For example, the first start determination unit 106 may turn on the first start determination flag when the current time is the provisional start time.

  The charging method determination unit 108 determines the charging method when the first start determination unit 106 determines that the current time is the provisional start time.

  Specifically, the charging method determination unit 108 determines the charging time, the charging current, and the cooling time using the cooling fan 28. Charging method determination unit 108 calculates the necessary amount of charge required until the current SOC of power storage device 16 becomes the SOC corresponding to full charge. Charging method determination unit 108 calculates the difference between the SOC corresponding to full charge and the current SOC as the required charge amount. The charging method determination unit 108 determines a charging time and a charging current for charging the calculated required charging amount before the charging end time using a map or the like.

  For example, FIG. 3 shows an example of a map used for determining the charging method. The vertical axis in FIG. 3 indicates the SOC, and the horizontal axis in FIG. 3 indicates the temperature TB (or outside air temperature). In the present embodiment, for convenience of explanation, the charging operation will be described by dividing into “rapid charging”, “normal charging”, and “slow charging” according to the charging current. The solid line in FIG. 3 is an equal charging current line for distinguishing between “rapid charging”, “normal charging”, and “slow charging”.

  “Fast charge” is charge control for charging the power storage device 16 with a charge current equal to or greater than a first threshold value. “Normal charging” is charging control in which the power storage device 16 is charged with a charging current smaller than the first threshold and larger than the second threshold. “Slow charging” is charging control in which the power storage device 16 is charged with a charging current equal to or less than the second threshold value. The first threshold value is larger than the second threshold value. Further, the solid line and the broken line in FIG. 3 are equal charging current lines indicating the same charging current.

  As shown in FIG. 3, for example, when SOC of current power storage device 16 is SOC (0) and current temperature TB of power storage device 16 is TB (0) (point A shown in FIG. 3) ), “Rapid charge” is executed. For example, when the SOC is SOC (0) and the temperature TB is TB (1) (point B shown in FIG. 3), “normal charge” is executed. For example, when SOC is SOC (0) and temperature TB is TB (2) (point C shown in FIG. 3), charging method determining unit 108 determines that “slow charging” is performed. Executed.

  The charging method determination unit 108 is based on, for example, an equal charging current line indicated by a solid line and a broken line in FIG. 3 when charging any one of “rapid charging”, “normal charging”, and “slow charging”. The charging current is determined by linear interpolation or the like.

  In the present embodiment, description will be made assuming that the charging method is determined using FIG. 3, but the present invention is not particularly limited to this. For example, the charging method determination unit 108 may determine the charging current based on the temperature TB and the outside air temperature.

  For example, FIG. 4 shows an example of a map used for determining the charging method. The vertical axis in FIG. 4 indicates the temperature TB, and the horizontal axis in FIG. 4 indicates the outside air temperature. Similar to the solid line in FIG. 3, the solid line in FIG. 4 is an equal charge current line that divides “rapid charge”, “normal charge”, and “slow charge”. Note that “rapid charge”, “normal charge”, and “slow charge” are as described with reference to FIG. 3, and thus detailed description thereof will not be repeated.

  As shown in FIG. 4, for example, when the temperature TB is TB (0) and the current outside air temperature is To (0) (point G shown in FIG. 4), “rapid charging” is performed. Executed. For example, when the temperature TB is TB (0) and the outside air temperature is To (1) (point H shown in FIG. 4), “normal charging” is executed. Alternatively, for example, when the temperature TB is TB (0) and the outside air temperature is To (2) (point I shown in FIG. 4), “slow charging” is executed.

  The charging method determining unit 108, for example, at the time of any one of “rapid charging”, “normal charging”, and “slow charging”, for example, to an equal charging current line indicated by a solid line and a broken line in FIG. Based on this, the charging current is determined by linear interpolation or the like.

  The charging method determination unit 108 may determine the charging method using one of the maps in FIGS. 3 and 4, or may use the maps in FIGS. 3 and 4, respectively. The charging current corresponding to this map may be determined, and the larger or smaller of the determined charging currents may be determined as the final charging current. Alternatively, the charging method determination unit 108 calculates the basic value of the charging current using one of the maps in FIGS. 3 and 4 and corrects the charging current using the other map to obtain the final charging. You may make it determine as an electric current.

  When the charging method determining unit 108 performs charging with the determined charging current, the charging time until the SOC corresponding to the fully charged state becomes longer than the time from the current time to the charging end time. The determined charging current may be maintained, or charging that is larger than the determined charging current under the condition that the temperature TB of the power storage device 16 after completion of charging is within an appropriate temperature range. The current may be determined as the final charging current, or a charging current larger than the charging current determined on the assumption that the cooling fan 28 is driven after completion of charging is determined as the final charging current. You may do it.

  The charging method determination unit 108 determines, as the charging time, the time required for charging the required charge amount with the charging current determined when the charging current is determined.

  Further, the charging method determination unit 108 calculates the amount of increase in the temperature TB of the power storage device 16 when the power storage device 16 is charged until the charging time determined with the determined charging current elapses. The temperature immediately after charging is estimated from the amount of increase and the current temperature TB.

  For example, the charging method determination unit 108 calculates the increase amount of the temperature TB based on the determined charging current, the determined charging time, and the map. The map is a map showing the relationship between the charging current, the charging time, and the amount of increase in temperature TB. The charging method determination unit 108 may calculate the increase amount of the temperature TB using a mathematical formula or a table instead of the map. Note that the charging method determination unit 108 may calculate an increase amount of the temperature TB based on the outside air temperature in addition to the charging current and the charging time.

  The charging method determination unit 108 determines the cooling time using the cooling fan 28 from the difference between the estimated temperature immediately after charging and the final target temperature. The target temperature is a temperature set in advance between a lower limit value TB (2) and an upper limit value TB (3) of an appropriate temperature range. The cooling time is determined based on, for example, a difference between the estimated temperature immediately after charging and the target temperature and a map. The map is a map showing the relationship between the estimated difference between the temperature immediately after charging and the target temperature and the cooling time.

  It should be noted that charging method determination unit 108 requires the time required to decrease the estimated temperature immediately after charging to the target temperature when cooling fan 28 is operated with an operation amount that does not decrease the SOC of power storage device 16. Is determined as the cooling time. The operation amount at which the SOC of the power storage device 16 does not decrease is, for example, the operation amount when the electric power supplied from the external power supply 30 via the charger 22 is used as the upper limit.

  The charging method determination unit 108 determines a predetermined time as the cooling time, and the time determined as described above from the difference between the temperature immediately after charging and the target temperature is longer than the predetermined time In this case, the time determined from the difference between the estimated temperature immediately after charging and the target temperature may be determined as the cooling time.

  The start time determination unit 110 determines a final charge start time based on the determined charging time and cooling time. For example, the start time determination unit 110 determines a time calculated by subtracting the sum of the charging time and the cooling time from the charging end time as the final charging start time.

  For example, when the final charge start time is determined, the start time determination unit 110 stores the verified final charge start time in the storage unit 27.

  The second start determination unit 112 determines whether or not the current time is the final charge start time. The second start determination unit 112 determines that the current time is the final charge start time when the current time based on the count value from the timer 25 matches the final charge start time stored in the storage unit 27. It is determined that For example, the second start determination unit 112 may turn on the second start determination flag when the current time is the final charge start time.

  When the second start determination unit 112 determines that the current time is the final charge start time, the charge control unit 114 performs charge control using the charging method determined by the charging method determination unit 108. The charge control unit 114 performs charge control so that the SOC becomes SOC corresponding to full charge. In the present embodiment, charge control unit 114 will be described as performing charge control until the SOC reaches SOC corresponding to full charge. For example, until SOC reaches SOC corresponding to full charge, In addition, the charging control may be completed at the earlier point in time until the current time reaches the charging end time.

  Further, for example, when the second start determination flag is on, the charging control unit 114 may perform the charging control using the charging method determined by the charging method determination unit 108.

  When the cooling time is determined by the charging method determination unit 108, the cooling fan control unit 116 is charged until the determined cooling time elapses after the charging of the power storage device 16 is completed, that is, the current time is charged. The cooling fan 28 may be operated until the end time is reached. The cooling fan control unit 116 determines that the operation of the cooling fan 28 is necessary when the temperature TB of the power storage device 16 after completion of charging exceeds an appropriate temperature range, operates the cooling fan 28, and performs charging. When the temperature TB of the power storage device 16 after completion is within an appropriate temperature range, it is determined that the operation of the cooling fan 28 is not necessary, and the cooling fan 28 is not operated.

  Cooling fan control unit 116 operates cooling fan 28 with an operation amount such that the SOC of power storage device 16 that has been charged does not decrease. Since “the amount of operation at which SOC does not decrease” is as described above, detailed description thereof will not be repeated.

  In the present embodiment, an appropriate temperature range is a temperature range in which TB (2) is a lower limit value and TB (3) is an upper limit value. Upper limit value TB (3) is an upper limit value of the temperature of power storage device 16 that does not require cooling fan 28 to be activated when vehicle 40 is started. Lower limit value TB (2) is a lower limit value of a temperature range in which the influence of the output decrease due to the temperature decrease is smaller than when the temperature of power storage device 16 is lower than TB (2).

  In the present embodiment, reservation determination unit 100, required time calculation unit 102, provisional start time determination unit 104, first start determination unit 106, charging method determination unit 108, start time determination unit 110, first time 2 The start determination unit 112, the charging control unit 114, and the cooling fan control unit 116 are all described as functioning as software realized by the CPU of the ECU 26 executing a program stored in the memory. However, it may be realized by hardware. Such a program is recorded on a storage medium and mounted on the vehicle.

  With reference to FIG. 5, a control structure of a program executed by ECU 26 that is the vehicle control apparatus according to the present embodiment will be described.

  In step (hereinafter, step is referred to as S) 100, ECU 26 determines whether or not reservation of the start time of vehicle 40 has been completed. If the reservation has been completed (YES in S100), the process proceeds to S102. If not (NO in S100), the process returns to S100.

  In S102, the ECU 26 calculates a required charging time Ta. Since the calculation method of required charging time Ta is as described above, detailed description thereof will not be repeated. In S104, the ECU 26 determines a provisional start time based on the current time and the required charging time Ta.

  In S106, ECU 26 determines whether or not the current time is a provisional start time. If the current time is the provisional start time (YES in S106), the process proceeds to S108. If not (NO in S106), the process returns to S106.

  In S108, ECU 26 determines a charging method. Since the determination of the charging method is similar to the operation of charging method determining unit 108 described above, detailed description thereof will not be repeated. In S110, ECU 26 determines the charging start time.

  In S112, ECU 26 determines whether or not the current time is the charging start time. If the current time is the charging start time (YES in S112), the process proceeds to S114. If not (NO in S112), the process proceeds to S114.

  In S114, ECU 26 starts charge control. In S116, ECU 26 determines whether or not charging is completed. For example, the ECU 26 determines that the charging has been completed when the SOC becomes the SOC corresponding to the full charge or when the current time is the charge end time. If charging is complete (YES in S116), the process proceeds to S118. If not (NO in S116), the process proceeds to S116.

  In S118, ECU 26 determines whether or not it is necessary to operate cooling fan 28. The ECU 26 determines that the cooling fan 28 needs to be operated when the temperature TB of the power storage device 16 is higher than an appropriate temperature range. Further, the ECU 26 may determine that it is not necessary to operate the cooling fan 28 when the current time is the charging end time. If it is determined that cooling fan 28 needs to be operated (YES in S118), the process proceeds to S120. If not (NO in S118), this process ends.

  In S120, ECU 26 operates cooling fan 28. In S122, ECU 26 determines whether or not the current time is the charging end time. If it is determined that the current time is the charging end time (YES in S122), the process proceeds to S124. If not (NO in S122), the process proceeds to S120. In S124, the ECU 26 stops the operation of the cooling fan 28.

  The operation of ECU 26, which is the vehicle control apparatus according to the present embodiment based on the structure and flowchart as described above, will be described with reference to FIG.

<When temperature TB is lower than the appropriate temperature range (1)>
For example, it is assumed that temperature TB is TB (0) and SOC is SOC (0). When the start time of vehicle 40 is reserved by the user (YES in S100), the reserved start time is determined as the charge end time, and charge required time Ta is set based on the determined charge end time. Calculated (S102).

  A time T (0) is determined as a provisional start time based on the current time and the calculated required charging time Ta (S104). If the current time becomes the provisional start time at time T (0) (YES in S106), the charging method is determined (S108).

  That is, when the temperature TB is TB (0) and the SOC is SOC (0), the charging current corresponding to the point A in FIG. 3 is calculated using the map shown in FIG. The charging time is calculated based on the charged current. Based on the calculated charging time, time T (3) is determined as the final charging start time (S110). At this time, zero is determined as the cooling time.

  When the current time becomes the charging start time at time T (3) (YES in S112), “rapid charging” is started (S114). When “rapid charging” is started, a charging current is supplied to the power storage device 16. As the charging current is supplied to the power storage device 16, the SOC increases with time. Since Joule heat is generated by supplying the charging current, when charging is started, the temperature of the power storage device 16 rises with time from TB (0).

  It is determined that charging is completed when the SOC increases until the SOC corresponding to full charge is reached at time T (5), which is the charge end time (YES in S116). Further, since temperature TB of power storage device 16 is a temperature within an appropriate temperature range (between TB (2) and TB (3)), it is determined that the operation of cooling fan 28 is unnecessary (in S118). NO).

<When temperature TB is within an appropriate temperature range (part 1)>
For example, it is assumed that temperature TB is TB (1) and SOC is SOC (0). When the start time of vehicle 40 is reserved by the user (YES in S100), the reserved start time is determined as the charge end time, and charge required time Ta is set based on the determined charge end time. Calculated (S102).

  A time T (0) is determined as a provisional start time based on the current time and the calculated required charging time Ta (S104). If the current time becomes the provisional start time at time T (0) (YES in S106), the charging method is determined (S108).

  That is, when the temperature TB is TB (1) and the SOC is SOC (0), the charging current corresponding to the point B in FIG. 3 is calculated and calculated using the map shown in FIG. The charging time is calculated based on the charged current. Based on the calculated charging time, a time T (2) that is a time point before the time T (3) is determined as a final charging start time (S110). At this time, zero is determined as the cooling time.

  When the current time becomes the charging start time at time T (2) (YES in S112), “normal charging” is started (S114). When “normal charging” is started, a charging current is supplied to the power storage device 16. As the charging current is supplied to the power storage device 16, the SOC increases with time. Since Joule heat is generated by supplying the charging current, when charging is started, the temperature of the power storage device 16 rises with time from TB (1). The time variation of temperature TB when “normal charging” is performed is smaller than the time variation of temperature TB when “rapid charging” is performed.

  It is determined that charging is completed when the SOC increases until the SOC corresponding to full charge is reached at time T (5), which is the charge end time (YES in S116). Further, since temperature TB of power storage device 16 is within an appropriate temperature range, it is determined that the operation of cooling fan 28 is unnecessary (NO in S118).

<When temperature TB is higher than the appropriate temperature range>
For example, it is assumed that temperature TB is TB (2) and SOC is SOC (0). When the start time of vehicle 40 is reserved by the user (YES in S100), the reserved start time is determined as the charge end time, and charge required time Ta is set based on the determined charge end time. Calculated (S102).

  A time T (0) is determined as a provisional start time based on the current time and the calculated required charging time Ta (S104). If the current time becomes the provisional start time at time T (0) (YES in S106), the charging method is determined (S108).

  That is, when the temperature TB is TB (1) and the SOC is SOC (0), the charging current corresponding to the point C in FIG. 3 is calculated using the map shown in FIG. The charging time is calculated based on the charged current. When it is estimated that the temperature immediately after charging of the power storage device 16 at the charging end time is larger than the appropriate temperature range when charging is performed with the calculated charging current, the temperature exceeding the appropriate temperature range The cooling time Tc1 for reducing the temperature is determined. Based on the calculated charging time and cooling time Tc1, time T (1), which is a time point before time T (2), is determined as the final charging start time (S110).

  When the current time becomes the charging start time at time T (1) (YES in S112), “slow charging” is started (S114). The charging current is supplied to the power storage device 16 by starting “slow charging”. As the charging current is supplied to the power storage device 16, the SOC increases with time. Since Joule heat is generated by supplying the charging current, the temperature of the power storage device 16 gradually rises from TB (2) when charging is started. It should be noted that the time variation of temperature TB when “slow charging” is performed is smaller than each of the time variations of temperature TB when “rapid charging” and “normal charging” are performed.

  At time T (4) when the charging time has elapsed, it is determined that charging has been completed when the SOC increases until the SOC reaches full charge (YES in S116). Further, since temperature TB of power storage device 16 at time T (4) is higher than an appropriate temperature range, it is determined that operation of cooling fan 28 is required (YES in S118), and cooling fan 28 is operated (S120). ). Since the cooling fan 28 is actuated to supply air having a lower temperature than the power storage device 16 to the power storage device 16, heat exchange is performed between the power storage device 16 and the air, so that the temperature of the power storage device 16 is increased over time. Decreases with progress.

  When the current time is the charging end time at time T (5) (YES in S122), the operation of cooling fan 28 is stopped (S124). Due to the operation of the cooling fan 28, the temperature TB of the power storage device 16 decreases until it reaches a temperature within an appropriate temperature range at time T (5).

  For example, when the SOC is high and charging is performed with the charging current determined using FIG. 3, when the temperature TB is expected to exceed the appropriate temperature range, “rapid charging” or “ Even when “normal charging” is performed, the cooling time is determined. The operation at this time will be described below with reference to FIG.

<When temperature TB is lower than an appropriate temperature range (part 2)>
For example, it is assumed that temperature TB is TB (0) and SOC is SOC (1). When the user makes a reservation for the start time of vehicle 40 (YES in S100), required charging time Ta is calculated (S102).

  Based on the current time and the calculated required charging time Ta, a time T (0) is determined as a provisional start time (S104). If the current time becomes the provisional start time at time T (0) (YES in S106), the charging method is determined (S108).

  That is, when temperature TB is TB (0) and SOC is SOC (1) higher than SOC (0), charging corresponding to point D in FIG. 3 is performed using the map shown in FIG. A current is calculated, and a charging time is calculated based on the calculated charging current. When it is estimated that the temperature immediately after charging of the power storage device 16 at the charging end time is larger than the appropriate temperature range when charging is performed with the calculated charging current, the temperature exceeding the appropriate temperature range The cooling time Tc2 for reducing the temperature is determined. Based on the calculated charging time and cooling time Tc2, time T (8) is determined as the final charging start time (S110).

  When the current time becomes the charging start time at time T (8) (YES in S112), “rapid charging” is started (S114). When the “rapid charge” is started, a charging current is supplied to the power storage device 16, and the temperature of the power storage device 16 rises as time elapses due to the generation of Joule heat as the SOC increases.

  At time T (11) when the charging time has elapsed, it is determined that charging has been completed when the SOC increases until the SOC reaches SOC corresponding to full charge (YES in S116). Further, since temperature TB of power storage device 16 at time T (11) is higher than the appropriate temperature range, it is determined that operation of cooling fan 28 is required (YES in S118), and cooling fan 28 is operated (S120). ).

  When the current time becomes the charging end time at time T (5) (YES in S122), the operation of cooling fan 28 is stopped (S124). Due to the operation of the cooling fan 28, the temperature TB of the power storage device 16 decreases until it reaches a temperature within an appropriate temperature range at time T (5).

<When temperature TB is within an appropriate temperature range (2)>
For example, it is assumed that temperature TB is TB (1) and SOC is SOC (1). When the user makes a reservation for the start time of vehicle 40 (YES in S100), required charging time Ta is calculated (S102).

  Based on the current time and the calculated required charging time Ta, a time T (0) is determined as a provisional start time (S104). If the current time becomes the provisional start time at time T (0) (YES in S106), the charging method is determined (S108).

  That is, when the temperature TB is TB (1) and the SOC is SOC (1), the charging current corresponding to the point E in FIG. 3 is calculated using the map shown in FIG. The charging time is calculated based on the charged current. When it is estimated that the temperature immediately after charging of the power storage device 16 at the charging end time is larger than the appropriate temperature range when charging is performed with the calculated charging current, the temperature exceeding the appropriate temperature range The cooling time Tc3 for reducing the temperature is determined. Based on the calculated charging time and cooling time Tc3, time T (7), which is a time point before time T (8), is determined as the final charging start time (S110).

  When the current time becomes the charging start time at time T (7) (YES in S112), “normal charging” is started (S114). When the “normal charging” is started, a charging current is supplied to the power storage device 16, and the temperature of the power storage device 16 rises with time due to the generation of Joule heat as the SOC increases.

  At time T (10), which is a time point before time T (11), it is determined that charging has been completed when the charging time has elapsed and the SOC has increased to SOC corresponding to full charge ( YES at S116). In addition, since temperature TB of power storage device 16 at time T (10) is higher than an appropriate temperature range, it is determined that operation of cooling fan 28 is necessary (YES in S118), and cooling fan 28 is operated. (S120).

  When the current time becomes the charging end time at time T (5) (YES in S122), the operation of cooling fan 28 is stopped (S124). Due to the operation of the cooling fan 28, the temperature TB of the power storage device 16 decreases until it reaches a temperature within an appropriate temperature range at time T (5).

  When temperature TB is higher than the appropriate temperature range TB (2) and SOC is SOC (1), “slow charging” is executed at time T (6), and time T In (9), the charging is completed when the charging time has elapsed, and the cooling fan 28 is operated until time T (5) is reached. These operations are the same as the charge control, the cooling fan control, and the temperature change when the temperature TB is higher than the appropriate temperature range, which has been described with reference to FIG. Therefore, detailed description thereof will not be repeated.

  As described above, according to the vehicle control device of the present embodiment, charging by the external power source can be completed at the start time of the vehicle reserved by the user, and the temperature of the power storage device after the charging is completed. Can be set within a suitable temperature range. Therefore, when the vehicle is driven using the rotating electrical machine at the time of starting the vehicle, it is possible to suppress a decrease in the output of the low power storage device due to the temperature of the power storage device being lower than the temperature within an appropriate temperature range. . Furthermore, it is possible to prevent the cooling fan from operating immediately after starting the vehicle due to the temperature of the power storage device being higher than the appropriate temperature range. Therefore, power consumption due to the operation of the cooling fan can be suppressed. As a result, deterioration of fuel consumption can be suppressed. Therefore, it is possible to provide a vehicle control device and a vehicle control method for setting the temperature of the power storage device to an appropriate temperature after completion of charging by the external power supply.

  In FIGS. 6 and 7, for convenience of explanation, it has been described that the required charging time Ta is the same, but the required charging time Ta is not limited to being the same.

  The cooling fan 28 may be operated until the charging end time is reached and stopped when the charging end time is reached, or when the temperature TB reaches a temperature within an appropriate temperature range. You may make it stop.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  2 engine, 4 power split mechanism, 6, 10 MG, 8 transmission gear, 12 drive shaft, 14 wheels, 16 power storage device, 18, 20 power converter, 22 charger, 24 charging port, 25 timer, 27 storage unit, 26 ECU, 28 Cooling fan, 30 External power supply, 34 Voltage sensor, 36 Current sensor, 38 Temperature sensor, 40 Vehicle, 42 Outside air temperature sensor, 100 Reservation determination unit, 102 Required time calculation unit, 104 Temporary start time determination unit, 106 112 start determination unit, 108 charging method determination unit, 110 start time determination unit, 114 charge control unit, 116 cooling fan control unit.

Claims (6)

A vehicle control device for a vehicle equipped with a power storage device and a rotating electrical machine that receives a power supply from the power storage device and generates a driving force, wherein the power storage device is charged using an external power supply outside the vehicle. Is possible,
The vehicle control device includes:
A temperature detector for detecting the temperature of the power storage device;
A remaining capacity detector for detecting a remaining capacity of the power storage device;
When a charging end time by charging using the external power source is set based on a user's request, the temperature of the power storage device becomes a temperature within a predetermined range at the charging end time, and the power storage And a control unit for charging the power storage device such that the remaining capacity of the device becomes a remaining capacity corresponding to a fully charged state. The vehicle further includes a cooling device for cooling the power storage device,
The control unit charges the battery before the charge end time when the temperature of the power storage device is estimated to be larger than the predetermined range when the charging of the power storage device is completed. The vehicle control device according to claim 1, wherein after the completion, the cooling device is operated so that a temperature of the power storage device falls within the predetermined range.   The said control part is a vehicle control apparatus of Claim 2 which operates the said cooling device by making into an upper limit the electric power supplied from the said external power supply, when operating the said cooling device before the said charging end time.   When the temperature of the power storage device is the first temperature, the control unit determines that the first value determined as charging power is a second temperature where the temperature of the power storage device is greater than the first temperature. The vehicle control device according to claim 1, wherein the charging power is determined to be larger than a second value determined as the charging power.   When the remaining capacity of the power storage device is a first amount, the control unit determines that a third value determined as the charging power is a second value in which the remaining capacity of the power storage device is greater than the first amount. The vehicle control device according to claim 4, wherein the charging power is determined to be larger than a fourth value determined as the charging power when the amount of the charging power is greater than the fourth value. A vehicle control method for a vehicle equipped with a power storage device and a rotating electrical machine that receives a power supply from the power storage device and generates a driving force, wherein the power storage device is charged using an external power supply outside the vehicle. Is possible,
The vehicle control method includes:
Detecting the temperature of the power storage device;
Detecting a remaining capacity of the power storage device;
When a charging end time by charging using the external power source is set based on a user's request, the temperature of the power storage device becomes a temperature within a predetermined range at the charging end time, and the power storage Charging the power storage device such that the remaining capacity of the device becomes a remaining capacity corresponding to a fully charged state.

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