Power supply control device

Abstract

To supply more electric power to a device outside a vehicle while managing a battery charge ratio within a prescribed range.SOLUTION: When a ratio for motor travel, which is a ratio of a capacity of a storage capacity used for motor travel to a battery capacity used for motor travel, exceeds a prescribed ratio larger than a value of 0, or when a storage ratio is less than a lower limit of a prescribed range in the case that external power supply is executed, a display ratio is set to a ratio for motor travel and is transmitted to a device outside a vehicle, and when the ratio for motor travel is the prescribed ratio or less, and the storage ratio is the lower limit or more, the display ratio is set to a value larger than the value of 0 and is transmitted to the device outside the vehicle.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a power supply control device.

Background Art

[0002] Conventionally, as this type of power supply control device, there has been proposed one used in a hybrid vehicle including a traveling engine, a traveling motor, and a battery that exchanges power with the motor and capable of external power supply for supplying power to an external device (see, for example, Patent Document 1). In this device, when performing external power supply, it is said that the convenience during external power supply is improved by displaying the power storage ratio (charge rate) of the battery in the hybrid vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described power supply control device, external power supply may be stopped when a power supply stop signal from an external device is received. In this case, until the power supply stop signal is received, it has been recognized as an important issue to supply more power to the external device while managing the power storage ratio within a predetermined range.

[0005] The main object of the power supply control device of the present disclosure is to supply more power to an external device while managing the power storage ratio of the battery within a predetermined range.

Means for Solving the Problems

[0006] To achieve the above main object, the power supply control device of the present disclosure adopts the following means. The power supply control device of the present disclosure includes a traveling engine, a traveling motor, a battery that exchanges power with the motor, and a power supply device that executes external power supply for supplying power from at least the battery to an external device. It manages the storage ratio, which is the ratio of the stored battery capacity to the total capacity of the battery, within a predetermined range. When the storage ratio is equal to or higher than a threshold within the predetermined range, it stops the operation of the engine and travels using the power from the motor (motor driving). When the storage ratio is less than the threshold, it travels with the operation of the engine (hybrid driving). When a power supply stop signal is received while executing the external power supply, it stops the external power supply. It is a hybrid vehicle having a display device for displaying information, and it displays a display ratio based on the storage ratio on the display device. When the display ratio is 0 or less, it transmits the power supply stop signal to the hybrid vehicle. It is a power supply control device used for the hybrid vehicle of a power supply system, and when executing the external power supply, when the ratio for motor driving, which is the ratio of the stored battery capacity used for motor driving to the capacity of the battery used for motor driving, exceeds a predetermined ratio greater than 0, or when the storage ratio is less than the lower limit value of the predetermined range, it sets the display ratio to the ratio for motor driving and transmits it to the external device. When the ratio for motor driving is less than or equal to the predetermined ratio and the storage ratio is greater than or equal to the lower limit value, it sets the display ratio to a value greater than 0 and transmits it to the external device.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0008] Embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of the configuration of a power supply system 10 including a power supply control device according to this embodiment. The power supply system 10 of this embodiment includes a hybrid vehicle 20 and an external power supply 90 outside the vehicle.

[0009] As shown in the figure, the hybrid vehicle 20 includes an engine 22, a planetary gear 30, motors MG1 and MG2, inverters 41 and 42, a battery 50, a charger / discharger 60, and a hybrid electronic control unit (hereinafter referred to as "HVECU") 70.

[0010] The engine 22 is configured as an internal combustion engine that outputs power using fuel such as gasoline or light oil. The engine 22 is operationally controlled by an engine electronic control unit (hereinafter referred to as "engine ECU") 24. Although not shown, the engine ECU 24 is configured as a microprocessor centered around a CPU, and in addition to the CPU, it includes a ROM that stores processing programs, a RAM that temporarily stores data, an input / output port, and a communication port. Signals from various sensors necessary for operationally controlling the engine 22, such as the crank angle θcr from a crank position sensor that detects the rotational position of the crankshaft 26 of the engine 22, are input into the engine ECU 24 through the input port. Various control signals for operationally controlling the engine 22, such as a control signal to a throttle motor that adjusts the position of the throttle valve, are output from the engine ECU 24 through the output port. The engine ECU 24 is connected to the HVECU 70 through a communication port. The engine ECU 24 calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22, based on the crank angle θcr from the crank position sensor.

[0011] The planetary gear 30 is configured as a single pinion type planetary gear mechanism. The rotor of the motor MG1 is connected to the sun gear of the planetary gear 30. The drive shaft 36, which is connected to the drive wheels 38a and 38b via the differential gear 37, is connected to the ring gear of the planetary gear 30. The crankshaft 26 of the engine 22 is connected to the carrier of the planetary gear 30.

[0012] The motors MG1 and MG2 are configured as, for example, synchronous motor generators. As described above, the rotor of the motor MG1 is connected to the sun gear of the planetary gear 30. The rotor of the motor MG2 is connected to the drive shaft 36. The inverters 41 and 42 are connected to the battery 50 via the power line 54. The motors MG1 and MG2 are rotationally driven by the motor electronic control unit (hereinafter referred to as "motor ECU") 40 by switching control of a plurality of switching elements (not shown) of the inverters 41 and 42. The motor ECU 40 is configured as a microprocessor centered on a CPU, although not shown, and includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port in addition to the CPU. Signals from various sensors necessary for driving and controlling the motors MG1 and MG2, such as the rotational positions θm1 and θm2 of the rotors of the motors MG1 and MG2 detected by the rotational position detection sensors, are input to the motor ECU 40 via the input port. Switching control signals and the like to a plurality of switching elements (not shown) of the inverters 41 and 42 are output from the motor ECU 40 via the output port. The motor ECU 40 is connected to the HVECU 70 via the communication port. The motor ECU 40 calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on the rotational positions θm1 and θm2 of the rotors of the motors MG1 and MG2 from the two rotational position detection sensors.

[0013] The battery 50 is configured as, for example, a lithium-ion secondary battery or a nickel-metal hydride secondary battery. As described above, the battery 50 is connected to the inverters 41 and 42 via the power line 54. The battery 50 is managed by a battery electronic control unit (hereinafter referred to as "battery ECU") 52. Although not shown, the battery ECU 52 is configured as a microprocessor centered on a CPU, and in addition to the CPU, it includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port. Signals from various sensors necessary for managing the battery 50, such as the battery voltage Vb from the voltage sensor 51a installed between the terminals of the battery 50 and the battery current Ib from the current sensor 51b attached to the output terminal of the battery 50, are input into the battery ECU 52 via the input port. The battery ECU 52 is connected to the HVECU 70 via the communication port. The battery ECU 52 calculates the state of charge SOC based on the integrated value of the battery current Ib from the current sensor 51b. The state of charge SOC is the ratio of the stored capacity (charge capacity) to the total capacity of the battery 50.

[0014] The charger (power supply device) 60 is connected to the power line 54 and is configured to be able to perform external charging of charging the battery 50 using the power from the external power supply 90 and external power supply of supplying the power from the battery 50 and the motor MG1 to the external power supply 90 when the connector 92 of the external power supply 90 and the vehicle-side connector 61 are connected. This charger 60 is controlled by the HVECU 70.

[0015] The HVECU 70 is configured as a microprocessor centered around a CPU (not shown). In addition to the CPU, it includes a ROM for storing processing programs, a RAM for temporarily storing data, an input / output port, and a communication port. Signals from various sensors such as the accelerator opening Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83 and the vehicle speed V from the vehicle speed sensor 88 are input into the HVECU 70 via the input port. From the HVECU 70, a control signal to the charger 60 and a display signal to the power meter 89 that displays information such as the discharge power at which the battery 50 is discharging are output. As described above, the HVECU 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via the communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52.

[0016] In the hybrid vehicle 20 configured in this way, it travels in hybrid driving or motor driving. In hybrid driving, it travels with the operation of the engine 22. In motor driving, it travels with the engine 22 stopped. At this time, the state of charge SOC of the battery 50 is managed so as to be within the use range Ruse (predetermined range) that is equal to or higher than the lower limit ratio (lower limit value) Smin (for example, 8%, 10%, 12%, etc.) and equal to or lower than the upper limit ratio (upper limit value) Smax (for example, 88%, 90%, 92%, etc.).

[0017] In the hybrid vehicle 20, when the system is started, it travels in the CD mode that prioritizes the decrease in the state of charge SOC of the battery 50 until the state of charge SOC of the battery 50 reaches a threshold S1 (for example, 25%, 30%, 35%, etc.) or less. After the state of charge SOC of the battery 50 reaches the threshold S1 or less, it travels in the CS mode that maintains the state of charge SOC of the battery 50 within the range from equal to or higher than the lower limit ratio Smin to equal to or lower than the threshold S1. In the CD mode, it travels in motor driving, and in the CS mode, it travels in HV driving.

[0018] In the hybrid vehicle 20, the HVECU 70 calculates the driving ratio SOCcd and displays the calculated driving ratio SOCc on the power meter 89. The driving ratio SOCcd is the ratio of the capacity that can be used for driving among the capacities stored in the battery 50 to the capacity of the battery 50 corresponding to the usage range Ruse of the battery 50. Further, the HVECU 70 calculates the motor driving ratio SOCcev, displays it on the power meter 89, and transmits it to the external power feeder 90 outside the vehicle. The motor driving ratio SOCcev is the ratio of the capacity that can be used for motor driving among the capacities stored in the battery 50 to the capacity of the battery 50 used for motor driving. FIG. 2 is an explanatory diagram showing an example of the relationship among the storage ratio SOC, the driving ratio SOCcd, and the motor driving ratio SOCcev.

[0019] The external power feeder 90 is installed at home or a charging stand, etc., and includes the above-described connector 92 and a display device 94 for displaying information, and supplies the power from the battery 50 or the motor MG1 of the hybrid vehicle 20 to the electrical appliances at home or the power line of the charging stand. The connector 92 also includes signal lines, and when connected to the vehicle-side connector 61, it exchanges various signals with the HVECU 70 via the signal lines.

[0020] Next, the operation of the power feeding system 10 of the present embodiment configured in this way, particularly the operation of the hybrid vehicle 20 when performing external power feeding, will be described. FIG. 3 is a flowchart showing an example of an external power feeding routine executed by the HVECU 70. This routine is repeatedly executed when the connector 92 of the external power feeder 90 and the vehicle-side connector 61 are connected during parking. When this routine is being executed, the motor MG2 is stopped from driving.

[0021] When this routine is executed, the HVECU 70 executes a process of inputting the storage ratio SOC and the motor driving ratio SOCcev (S100). The storage ratio SOC is input as the one calculated by the battery ECU 52. The motor driving ratio SOCcev is input as the one calculated by the HVECU 70.

[0022] Subsequently, it is determined whether the motor running ratio SOCcev is greater than 0 and less than or equal to a predetermined ratio S2 (for example, 1%, 2%, 3%, etc.) near 0, and whether the power storage ratio SOC is greater than or equal to the lower limit ratio Smin (S110). When the motor running ratio SOCcev exceeds the predetermined ratio S2 or when the power storage ratio SOC is less than the lower limit ratio Smin, the display ratio SOCd is set to the motor running ratio SOCcev, and the set display ratio SOCd is transmitted to the external power supply 90 via the signal line of the vehicle-side connector 61 (S120), and this routine ends. When the motor running ratio SOCcev is less than or equal to the predetermined ratio S2 and the power storage ratio SOC is greater than or equal to the lower limit ratio Smin, the display ratio SOCd is set to a predetermined value Sref (for example, 1%) greater than 0, and the set display ratio SOCd is transmitted to the external power supply 90 via the signal line of the vehicle-side connector 61 (S130), and this routine ends. The external power supply 90 that has received the display ratio SOCd displays the display ratio SOCd on the display device 94. Then, it is determined whether the display ratio SOCd is less than or equal to 0. When the display ratio SOCd is less than or equal to 0, an external power supply stop signal is transmitted to the hybrid vehicle 20 via the connector 92 and the signal line of the vehicle-side connector 61. The hybrid vehicle 20 that has received the external power supply stop signal stops the external power supply.

[0023] When external power supply is being executed, when the motor running ratio SOCcev exceeds a predetermined ratio S2, the display ratio SOCd is set to the motor running ratio SOCcev and transmitted to the external power supply device 90 (S120). Since the display ratio SOCd is greater than the value 0, a power supply stop signal is not transmitted from the external power supply device 90, and the external power supply continues. When the motor running ratio SOCcev is less than or equal to the predetermined ratio S2 and the power storage ratio SOC is greater than or equal to the lower limit ratio Smin, the display ratio SOCd is set to a value Sref greater than the value 0 and transmitted to the external power supply device 90 (S130). Since the display ratio SOCd is greater than the value 0, a power supply stop signal is not transmitted from the external power supply device 90, and the external power supply continues without being stopped. Thereby, more electric power among the electric power stored in the battery 50 can be used for external power supply. And when the power storage ratio SOC is less than the lower limit ratio Smin, the display ratio SOCd is set to the motor running ratio SOCcev and transmitted to the external power supply device 90 (S120). In this case, since the motor running ratio SOCcev is less than or equal to the value 0, a power supply stop signal is transmitted from the external power supply device 90. In the hybrid vehicle 20 that has received the power supply stop signal, the external power supply is stopped. Thereby, while managing the power storage ratio SOC of the battery 50 within the use range, more electric power can be supplied to the external power supply device 90.

[0024] According to the power supply system 10 including the power supply control device of the present embodiment described above, when external power supply is being executed, when the motor running ratio SOCcev exceeds a predetermined ratio S2 or when the power storage ratio SOC is less than the lower limit ratio Smin of the use range Ruse, the display ratio SOCd is set to the motor running ratio SOCcev and transmitted to the external power supply device 90. When the motor running ratio SOCcev is less than or equal to the predetermined ratio S2 and the power storage ratio SOC is greater than or equal to the lower limit ratio Smin, by setting the display ratio SOCd to a predetermined value Sref and transmitting it to the external power supply device 90, while managing the power storage ratio SOC of the battery 50 within the use range, more electric power can be supplied to the external power supply device 90.

[0025] In the above-described embodiment, the display ratio SOCd is set to a predetermined value Sref in S130, but the display ratio SOCd may be changed toward the predetermined value Sref.

[0026] Note that the correspondence relationship between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems is an example for specifically explaining the mode for carrying out the invention described in the column of means for solving the problems in the embodiment. Therefore, it does not limit the elements of the invention described in the column of means for solving the problems. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description in that column, and the embodiment is merely a specific example of the invention described in the column of means for solving the problems.

[0027] As described above, the embodiments for carrying out the present disclosure have been described. However, the present disclosure is not limited to such embodiments, and it goes without saying that the present disclosure can be implemented in various forms without departing from the gist of the present disclosure.

Description of Reference Numerals

[0028] 10 Power supply system, 20 Hybrid vehicle, 70 HVECU, 90 External power supply device.

Claims

【Claim 1】 A hybrid vehicle having a running engine, a running motor, a battery that exchanges power with the motor, a power supply device that performs external power supply for supplying at least the power from the battery to an external device, managing the storage ratio, which is the ratio of the stored capacity to the total capacity of the battery, within a predetermined range, and when the storage ratio is equal to or greater than a threshold value within the predetermined range, stopping the operation of the engine and running on the power from the motor (motor running), and when the storage ratio is less than the threshold value, running with the operation of the engine (hybrid running), and stopping the external power supply when a power supply stop signal is received while the external power supply is being executed. An external device having a display device for displaying information, displaying a display ratio based on the storage ratio on the display device, and transmitting the power supply stop signal to the hybrid vehicle when the display ratio is less than or equal to 0. A power supply control device used for the hybrid vehicle of the power supply system, comprising: When the external power supply is being executed, when the motor running ratio, which is the ratio of the stored capacity used for motor running to the capacity of the battery used for motor running, exceeds a predetermined ratio greater than 0, or when the storage ratio is less than the lower limit value of the predetermined range, setting the display ratio to the motor running ratio and transmitting it to the external device, and when the motor running ratio is less than or equal to the predetermined ratio and the storage ratio is greater than or equal to the lower limit value, setting the display ratio to a value greater than 0 and transmitting it to the external device. Power supply control device.

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