Power supply control method and power supply control device

Abstract

A power supply control method in which a control device of a stopped electric vehicle controls air conditioning power, which is power supplied to an conditioning device in a vehicle cabin, and external supply power, which is power supplied to an external device, when power is supplied to the air conditioning device, the external device, and an auxiliary device from a battery of the electric vehicle, wherein: a calculation is made of accessory power, which is the total value of the air conditioning power, the external supply power, and auxiliary device power, which is the power to be supplied to the auxiliary device; a threshold value is set for the accessory power; and, when the accessory power exceeds the threshold value, the air conditioning power is limited, thereby suppressing the accessory power to the threshold value or less.

Description

Power supply control method and power supply control device

[0001] The present invention relates to a power supply control method and a power supply control device for an electric vehicle.

[0002] JP7052673B2 discloses an electric vehicle that is provided with a power supply port in the front compartment, thereby enabling external power supply with the doors and windows closed.

[0003] In recent years, electric vehicles have become known that are capable of supplying power from an onboard battery to external devices (external power supply) using a charging port or the like. In such electric vehicles capable of external power supply, the cable harnesses used for power supply lines, such as those connecting the battery and power distributor, tend to be thick. However, due to issues such as handling and space, it is desirable for the cable harness to be as thin as possible, as long as it can transmit the required power.

[0004] However, when the cable harness of the power supply line is made thinner, the power endurance decreases, so the rated current of the fuse installed in the power supply line must be made smaller. Therefore, when the cable harness is made thinner, the power supplied to external devices, etc., is likely to exceed the power endurance of the cable harness (the rated current of the fuse). In particular, when an external power supply is used while the air conditioning system in the vehicle cabin is in use, the power supplied to the air conditioning system and external devices is likely to exceed the power endurance of the cable harness.

[0005] The present invention aims to provide a power supply control method and a power supply control device that control the supplied power so as not to exceed the durable power of a cable harness when an air conditioning system and an external device are used simultaneously in an electric vehicle.

[0006] One aspect of the present invention is a power supply control method in which, when power is supplied from a battery of a parked electric vehicle to an air conditioner in a passenger compartment, external equipment, and accessories, a control device of the electric vehicle controls air conditioning power, which is power supplied to the air conditioner, and external supply power, which is power supplied to the external equipment. This power supply control method calculates accessory power, which is the total value of the air conditioning power, external supply power, and accessory power, which is power supplied to the accessories, sets a threshold for the accessory power, and when the accessory power exceeds the threshold, limits the air conditioning power to keep the accessory power below the threshold.

[0007] FIG. 1 is a block diagram showing a schematic configuration of an electric vehicle. FIG. 2 is a block diagram showing the configuration of a controller. FIG. 3 is a flowchart related to power supply control. FIG. 4 is an explanatory diagram showing the relationship between accessory power and a threshold value. FIG. 5 is an explanatory diagram showing a mode of limiting supplied power. FIG. 6 is an explanatory diagram showing a scene in which the output power of the battery falls below a threshold value. FIG. 7 is a flowchart of power supply control according to a second embodiment. FIG. 8 is an explanatory diagram showing a mode of limiting supplied power in the second embodiment.

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0009] [First embodiment] Fig. 1 is a block diagram showing a schematic configuration of an electric vehicle 100. As shown in Fig. 1, the electric vehicle 100 includes a battery 11 (BAT), a rotating electric machine 12 (MOT), an inverter 13 (INV), an accessory power supply box 14 (ACC), an auxiliary machine 15 (AUX), an air conditioning device 16, and the like.

[0010] The battery 11 (BAT) is a rechargeable DC power source. The battery 11 is a so-called high-voltage battery, and stores power to drive the rotating electric machine 12. The DC power output by the battery 11 is also supplied to each part of the electric vehicle 100 that is driven at a relatively low voltage, such as the auxiliary machine 15. In other words, the battery 11 stores power to drive each part of the electric vehicle 100. The battery 11 is, for example, configured by a lithium-ion battery or the like. The output power P of the battery 11 ＯＵＴcan be appropriately acquired based on the measured values ​​of a voltage sensor or a current sensor (not shown). ＯＵＴ represents the total amount of power (outputtable power) that can be output by the battery 11. The power that the battery 11 actually outputs is the power required by the rotating electrical machine 10, the auxiliary machine 15, etc.

[0011] The rotating electric machine 12 (MOT) is an electric motor or a generator. In this embodiment, the rotating electric machine 12 is an electric motor that generates driving force for the electric vehicle 100, and is configured by, for example, a three-phase AC synchronous motor. When the rotating electric machine 12 is rotated by the wheels, it also functions as a generator that recovers the kinetic energy of the electric vehicle 100 as electrical energy.

[0012] The inverter 13 (INV) converts the DC output power P ＯＵＴ The bridge circuit 17 converts the AC power into AC power and supplies it to the rotary electric machine 12. The bridge circuit 17 is configured using semiconductor switching elements such as an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0013] The accessory power supply box 14 (ACC) is ＯＵＴ 1, the output power P ＯＵＴ The diagram shows the distribution route, i.e., the power supply lines to each part.

[0014] In this embodiment, the accessory power supply box 14 is connected to the battery 11 via the inverter 13. Specifically, the power supply line to the accessory power supply box 14 branches off from the power supply line from the battery 11 to the rotating electrical machine 12. Therefore, the output power P ＯＵＴ The inverter 13 distributes the power to the rotating electrical machine 10 and the accessory power supply box 14 .

[0015] In the following, the electric power required by the rotating electric machine 10, i.e., the electric power supplied from the battery 11 to the rotating electric machine 10, will be referred to as the rotating electric machine electric power P ＭＯＴ The power required by each component that receives power via the accessory power supply box 14, i.e., the total power supplied from the battery 11 to each component via the accessory power supply box 14, is referred to as the accessory power P ＡＣＣ That's what they say.

[0016] The accessory power supply box 14 is connected to the inverter 13 by a cable harness 18 (wire harness). That is, the power supply line from the inverter 13 to the accessory power supply box 14 is formed by the cable harness 18. Furthermore, a fuse 19 (current fuse) is provided in the power supply line from the inverter 13 to the accessory power supply box 14.

[0017] The fuse 19 is an element that cuts off the current between the battery 11 and the accessory power supply box 14 when a current greater than a predetermined magnitude (hereinafter referred to as the rated current) flows through the power supply line to the accessory power supply box 14. Specifically, the fuse 19 is configured using a fuse element that melts down due to Joule heat when a current greater than the rated current flows. In this embodiment, the fuse 19 is provided in the inverter 13.

[0018] The rated current of the fuse 19 is determined according to the diameter (thickness) of the cable harness 18. When the cable harness 18 is relatively thick and can supply a large current to the accessory power supply box 14, a fuse 19 with a large rated current is used. On the other hand, when the cable harness 18 is relatively thin and can supply only a small current to the accessory power supply box 14, a fuse 19 with a small rated current is used. In other words, the thinner the cable harness 18, the smaller the rated current of the fuse 19 must be. For this reason, when a thin cable harness 18 is used, the accessory power P is determined by the thickness of the cable harness 18 and the corresponding rated current of the fuse 19 (hereinafter referred to as the "rated current of the fuse 19"). ＡＣＣIn this embodiment, the electric vehicle 100 uses a cable harness 18 that is thinner than conventional cables, and the output power P ＯＵＴ is greater than the power required for the operation of the auxiliary device 15, etc., the rated current of the fuse 19 allows the accessory power P ＡＣＣ may be restricted.

[0019] In this embodiment, the accessory power supply box 14 branches the power supply line and connects it to a bi-directional onboard charger (BOBC) 21, a DC / DC converter 22 (DC / DC), an air conditioner 16, etc. ＡＣＣ is distributed to the bidirectional on-board charger 21 , the DC / DC converter 22 , and the air conditioner 16 .

[0020] The bidirectional on-board charger 21 is connected to a normal charging (NC) port 23. The NC port 23 is connected to either a normal external power supply 24 or an external device 25.

[0021] The ordinary external power supply 24 is, for example, a so-called ordinary charger or a 100V or 200V output outlet. When connected to an ordinary charger, a plug attached to the ordinary charger is connected to the NC port 23. When connected to an outlet, the NC port 23 is connected to the outlet using, for example, a charging cable (EVSE: Electric Vehicle Supply Equipment) not shown. When the ordinary external power supply 24 is connected to the NC port 23, the bidirectional on-board charger 21 converts AC power supplied from the ordinary external power supply 24 into DC power and inputs the converted DC power to the battery 11 via the power supply line of the accessory power supply box 14. In this way, the battery 11 is charged by the ordinary external power supply 24.

[0022] When an external device 25 is connected to the NC port 23, the bidirectional on-board charger 21 converts DC power supplied via the power supply line of the accessory power supply box 14 into AC power and supplies the converted AC power to the external device 25. Hereinafter, the power for operating the external device 25, i.e., the power that the external device 25 requests from the electric vehicle 100, will be referred to as external supply power P ＥＸ In addition, the external power supply P ＥＸ The voltage is predetermined by the standard of the external power supply function, and is, for example, 100V.

[0023] The external device 25 is, for example, a home appliance such as a rice cooker or a microwave oven, or an outdoor electrical device. A plurality of external devices 25 may be connected to the NC port 23. In this case, the external power supply P ＥＸ means the total power required by a plurality of external devices 25 from electric vehicle 100. When external device 25 is a microwave oven, its power consumption is typically about 500 to 600 W, for example.

[0024] In addition to the NC port 23, the electric vehicle 100 also has a quick charge (QC) port 26. A quick charger 27 supplies DC power to the electric vehicle 100. Therefore, when the plug of the quick charger 27 is connected to the QC port 26, the battery 11 can be directly charged by the power supplied from the quick charger 27. Therefore, the QC port 26 is connected to the battery 11 without going through the accessory power box 14.

[0025] The DC / DC converter 22 reduces the voltage of the DC power distributed from the accessory power supply box 14 and supplies it to the auxiliary device 15 (AUX).

[0026] Among the various devices mounted on the electric vehicle 100, the accessories 15 are electric devices or electronic devices that operate at a lower voltage than the rotating electric machine 12. The accessories 15 include devices that are essential for controlling the electric vehicle 100. For example, the accessories 15 include a controller 28. The controller 28 is configured by one or more computers that comprehensively control the operation of each part of the electric vehicle 100, and is programmed to perform calculations and the like at a predetermined control cycle.

[0027] For example, when an external device 25 is detected at the NC port 23, the controller 28 prohibits (stops) driving of the rotating electric machine 12. That is, only one of the rotating electric machine 12 (bridge circuit 17 of the inverter 13) and the bidirectional on-board charger 21 is active. Therefore, the external device 25 can only be used when the electric vehicle 100 is stopped. In this embodiment, the controller 28 functions as a power supply control device that controls, in particular, the power supplied to the air conditioning device 16 and the power supplied to the external device 25.

[0028] In the following, the power for operating the auxiliary device 15, that is, the power that the auxiliary device 15 requests from the electric vehicle 100, will be referred to as auxiliary device power P ＡＵＸ It should be noted that the "auxiliary equipment" of the electric vehicle 100 may include the air conditioning device 16, but in this embodiment, for the sake of explanation, the entirety of what is generally referred to as "auxiliary equipment" excluding the air conditioning device 16 will be referred to as the auxiliary equipment 15.

[0029] The air conditioner 16 adjusts the temperature of the passenger compartment of the electric vehicle 100. The air conditioner 16 is configured using, for example, a PTC heater 29 (PTC: positive temperature coefficient) and an electric compressor 30 (eComp). The PTC heater 29 generates heat when energized. Therefore, the air conditioner 16 uses the PTC heater 29 to heat the passenger compartment. In a heat transport system that transfers heat by repeatedly evaporating (vaporizing) and condensing (liquefying) a refrigerant, the electric compressor 30 is a device that compresses and condenses refrigerant gas. The air conditioner 16 uses the electric compressor 30 to heat or cool the passenger compartment, or both. The electric compressor 30 also functions as an element of a cooling system that cools the electric powertrain, which is configured by the rotating electric machine 10, the inverter 13, etc. Hereinafter, the power supplied to the PTC heater 29 and the electric compressor 30, that is, the power required by the air conditioning device 16 for the electric vehicle 100, will be referred to as air conditioning power P ＡＩＲ That's what they say.

[0030] 2 is a block diagram showing the configuration of the controller 28. This diagram particularly shows the configuration related to the allocation and limitation of power to each unit. As shown in FIG. 2, the controller 28 includes an accessory power calculation unit 31, a priority setting unit 32, and a power supply control unit 33.

[0031] The accessory power calculation unit 31 calculates the accessory power P ＡＣＣ Specifically, the accessory power calculation unit 31 calculates the external supply power P ＥＸ , auxiliary power P ＡＵＸ , and air conditioning power P ＡＩＲ and add them up to obtain the accessory power P ＡＣＣ Calculate the following.

[0032] The accessory power calculation unit 31 monitors, for example, the voltage, current, or both of the power supply lines to the bidirectional in-vehicle charger 21, the DC / DC converter 22, and the air conditioner 16 using sensors (not shown), thereby calculating the external supply power P ＥＸ , auxiliary power P ＡＵＸ , and air conditioning power P ＡＩＲ can be obtained.

[0033] The accessory power calculation unit 31 calculates the external supply power P ＥＸ can be acquired from the external device 25, for example, by communicating with the external device 25.

[0034] Auxiliary power P ＡＵＸ is the power required to operate the electric vehicle 100, and is the power consumed by the controller 28, etc., and is therefore a substantially known value. ＡＵＸ In this embodiment, the accessory power calculation unit 31 calculates the auxiliary power P ＡＵＸ is set to a predetermined constant value.

[0035] In addition, since the performance (power consumption) of the PTC heater 29 and the electric compressor 30 is known, the air conditioning power P ＡＩＲcan be estimated based on the air conditioning temperature setting by the user, the actual vehicle interior temperature, etc. In this embodiment, the accessory power calculation unit 31 calculates the air conditioning setting temperature and the air conditioning power P based on experiments, simulations, etc. ＡＩＲ By referring to this, the air conditioning power P corresponding to the set temperature of the air conditioning is calculated. ＡＩＲ Calculate the following.

[0036] The priority setting unit 32 determines the accessory power P ＡＣＣ When it becomes necessary to limit the external supply power P ＥＸ or air conditioning power P ＡＩＲ Prioritize which supply to maintain.

[0037] For example, the air conditioning power P ＡＩＲ On the other hand, the external power supply P ＥＸ If the priority of P is high, the accessory power ＡＣＣ When it becomes necessary to limit the external power supply P ＥＸ The supply of air conditioning power P ＡＩＲ Therefore, the external device 25 can be used as is, while the output of the air conditioner 16 is reduced or stopped. ＥＸ In contrast, air conditioning power P ＡＩＲ If the priority of P is high, the accessory power ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲ The supply of the external power supply P ＥＸ Therefore, the output of the air conditioner 16 is maintained, while the output of the external device 25 is reduced or stopped.

[0038] In addition, auxiliary power P ＡＵＸ is the electric power for operating the electric vehicle 100 as described above, and the auxiliary power P ＡＵＸ Since the auxiliary power P cannot be reduced (limited), it is not subject to priority setting by the priority setting unit 32. ＡＵＸ The supply of external power P ＥＸ and air conditioning power P ＡＩＲ It can be said that the highest priority is set for the

[0039] The priority setting unit 32 can receive a user setting of the priority from a user interface 34 (UI). That is, the user of the electric vehicle 100, such as a driver or a passenger, can use the user interface 34 to set the accessory power P ＡＣＣ When it becomes necessary to limit the external supply power P ＥＸ or air conditioning power P ＡＩＲ The user interface 34 is, for example, an operation button or an operation screen provided on an instrument panel of the electric vehicle 100, or an operation screen of a smartphone or the like that cooperates with the electric vehicle 100.

[0040] In this embodiment, the default priority setting (initial setting) is ＥＸ In contrast, the air conditioning power P ＡＩＲ Therefore, if the user does not set the priority, the accessory power P ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲ The supply of the external power supply P ＥＸ The supply of air conditioning power P ＡＩＲ External power supply P ＥＸ If the priority is set to high, the accessory power P ＡＣＣ When it becomes necessary to limit the external power supply P ＥＸ The supply of air conditioning power P ＡＩＲ The supply of is limited.

[0041] Furthermore, the priority setting unit 32 can accept a setting to temporarily or permanently disable the user's priority setting from the user interface 34. When the user's priority setting is disabled, the priority setting unit 32 uses the default priority setting. Therefore, when the user sets the air conditioning power P ＡＩＲ External power supply P ＥＸ If the user sets the priority of the accessory power P ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲThe supply of the external power supply P ＥＸ The supply of is limited.

[0042] When the connection of the external device 25 to the NC port 23 is detected, the priority setting unit 32 automatically changes the default priority setting to the air conditioning power P ＡＩＲ External power supply P ＥＸ However, in this embodiment, as described above, the air conditioning power P ＡＩＲ External power supply P ＥＸ The switching to the setting with higher priority is performed based on the user's operation.

[0043] The power supply control unit 33 controls the power supply to each unit by the accessory power supply box 14. That is, the power supply control unit 33 controls the power distribution to the auxiliary equipment 15, the air conditioner 16, and the external device 25. The accessory power P ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲ or external power supply P ＥＸ Limit.

[0044] Specifically, the power supply control unit 33 supplies the accessory power P ＡＣＣ For the threshold P ＴＨ Then, the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds (P ＡＣＣ >P ＴＨ ), the power supply control unit 33 supplies the accessory power P ＡＣＣ It is determined that it is necessary to limit the air conditioning power P ＡＩＲ or external power supply P ＥＸ As a result, the power supply control unit 33 limits the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0045] On the other hand, accessory power P ＡＣＣ is the threshold P ＴＨ When (P ＡＣＣ ≦P ＴＨ ), the power supply control unit 33 supplies the accessory power PＡＣＣ , and determines that there is no need to limit the air conditioning power P ＡＩＲ and external power supply P ＥＸ In addition, the air conditioning power P ＡＩＲ or external power supply P ＥＸ When limiting the accessory power P ＡＣＣ is the threshold P ＴＨ When the air conditioning power P ＡＩＲ and external power supply P ＥＸ supply.

[0046] Accessory Power P ＡＣＣ Threshold P for ＴＨ is determined in advance based on the amount of current that can be supplied from the battery 11 to the air conditioner 16, the external device 25, and the auxiliary machine 15 as a whole.

[0047] In this embodiment, a thinner cable harness 18 is used to connect the accessory power supply box 14 and the inverter 13 than in the past, and the thickness (thinness) of the cable harness 18 becomes a bottleneck in the amount of current that can be supplied from the battery 11 to the air conditioner 16, the external device 25, and the auxiliary machinery 15 as a whole. Therefore, the threshold value P ＴＨ is determined in advance based on the thickness of the cable harness 18. ＴＨ The thinner the cable harness 18, the lower the threshold P ＴＨ is smaller.

[0048] More specifically, the rated current of the fuse 19 provided at the connection between the battery 11 and the accessory power supply box 14 is determined according to the thickness of the cable harness 18, and the rated current of this fuse 19 becomes a bottleneck in the amount of current that can be supplied from the battery 11 to the air conditioner 16, the external device 25, and the auxiliary machinery 15 as a whole. ＴＨ is determined based on the rated current of the fuse 19. The rated current of the fuse 19 and the threshold P ＴＨ The smaller the rated current of the fuse 19, the lower the threshold PＴＨ is smaller.

[0049] The power supply control unit 33 supplies the accessory power P ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲ or external power supply P ＥＸ In other words, the power supply control unit 33 has a dynamic limiting mode and a static limiting mode as modes for limiting the accessory power P ＡＣＣ When it becomes necessary to limit the air conditioning power P ＡＩＲ or external power supply P ＥＸ In this embodiment, the power supply control unit 33 switches between the dynamic limiting mode and the static limiting mode in accordance with the setting made by the user using the user interface 34.

[0050] Dynamic limiting mode is ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ or external power supply P ＥＸ This is a mode in which the maximum value (upper limit) of the power to be limited is dynamically changed (adjusted).

[0051] In the dynamic limiting mode, the power supply control unit 33 sets the threshold P ＴＨ From the auxiliary power P ＡＵＸ and air conditioning power P ＡＩＲ or external power supply P ＥＸ By subtracting the power that maintains the supply amount from the power that maintains the supply amount, the surplus power P ＳＵＲ Then, the power supply control unit 33 calculates the air conditioning power P ＡＩＲ or external power supply P ＥＸ The maximum value of the power to be limited is the surplus power P ＳＵＲ Set it equal to

[0052] For example, the external power supply P ＥＸ Maintain the supply of air conditioning power P ＡＩＲ When limiting the power consumption, the power supply control unit 33 sets the threshold P ＴＨ Auxiliary power P ＡＵＸ and external power supply PＥＸ By subtracting ＳＵＲ Therefore, the surplus power P ＳＵＲ Is, P ＳＵＲ =P ＴＨ -P ＡＵＸ -P ＥＸ In this embodiment, the threshold value P ＴＨ and auxiliary power P ＡＵＸ is a fixed value, so the surplus power P ＳＵＲ is the external power supply P ＥＸ When the external supply power P ＥＸ The surplus power P fluctuates depending on the change in ＳＵＲ , air conditioning power P ＡＩＲ That is, the maximum value of the air conditioning power P ＡＩＲ is the dynamically set surplus power P ＳＵＲ It is limited to the following:

[0053] Static limit mode is the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ or external power supply P ＥＸ In this mode, the maximum value (upper limit) of the power to be limited is statically determined.

[0054] In the static restriction mode, the power supply control unit 33 controls the air conditioning power P ＡＩＲ or external power supply P ＥＸ The maximum value of the power to be limited is the external supply power P ＥＸ For example, the external power supply P ＥＸ Maintain the supply of air conditioning power P ＡＩＲ When limiting the air conditioning power P ＡＩＲ The maximum value of the air conditioning power P ＡＩＲ is limited to a statically set fixed value or less.

[0055] In the static limit mode, the air conditioning power P ＡＩＲ or external power supply P ＥＸThe maximum value of the power to be limited among the values ​​is determined in advance by experiment, simulation, or the like. In this embodiment, the power supply control unit 33 controls the air conditioning power P ＡＩＲ or external power supply P ＥＸ The power supply control unit 33 presents the user with multiple candidates as the maximum power limit value among the above, and accepts the user's selection. The power supply control unit 33 presents the candidates as specific numerical values, such as 1 kW, 3 kW, and 5 kW. The power supply control unit 33 can also present the candidates in an expression form that suggests a magnitude relationship between the candidates, such as "small," "medium," and "large," without indicating a specific candidate value, or together with a specific candidate value. The power supply control unit 33 sets one of the candidates as a default value, and uses the default value when the user does not set it.

[0056] In the static restriction mode, the power supply control unit 33 ＡＩＲ When limiting the air conditioning power P ＡＩＲ and the external supply power P ＥＸ When limiting the external power supply P ＥＸ For example, the power supply control unit 33 may set the maximum value of the air conditioning power P ＡＲＩ When limiting the external power supply P ＥＸ When limiting the power consumption, the maximum value can be set to 500 W or the like.

[0057] The operation of power supply control in the electric vehicle 100 configured as described above will be described below.

[0058] 3 is a flowchart relating to the power supply control. As shown in FIG. 3, in step S10, the controller 28 ＯＵＴ In the scene described in this embodiment, the output power P of the battery 11 is acquired or calculated. ＯＵＴ is kept sufficiently large, and the output power P ＯＵＴ There will be no shortage of the above.

[0059] In step S11, the controller 28 calculates the external supply power P ＥＸ , auxiliary power P ＡＵＸ , and air conditioning power P ＡＩＲ By adding these, the accessory power P ＡＣＣ Then, in step S12, the controller 28 calculates the accessory power P ＡＣＣ is the threshold P ＴＨ Compare with.

[0060] In step S12, the accessory power P ＡＣＣ is the threshold P ＴＨ If the external supply power P ＥＸ and air conditioning power P ＡＩＲ supply.

[0061] On the other hand, in step S12, the accessory power P ＡＣＣ is the threshold P ＴＨ When the external supply power P is larger than the rated current of the fuse 19 (the thinness of the cable harness 18), the power supply control unit 33 cannot supply the external device 25 or the air conditioner 16 with the requested power, and the external supply power P ＥＸ or air conditioning power P ＡＩＲ Therefore, the process proceeds to step S14, where the power supply control unit 33 checks the user settings regarding the priority.

[0062] If there is no user setting regarding the priority in step S14, the process proceeds to step S15, and the power supply control unit 33 determines the external supply power P ＥＸ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0063] On the other hand, if there is a user setting regarding the priority in step S14, the process proceeds to step S16, where the power supply control unit 33 determines whether the air conditioning power PAIR or the external supply power P is in accordance with the user setting. ＥＸ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0064] Specifically, in step S16, the power supply control unit 33 checks whether the user setting prioritizes power supply to the external device 25 (external power supply). If the user setting prioritizes external power supply, the process proceeds to step S17, where the power supply control unit 33 determines whether the air conditioning power P ＡＩＲ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0065] On the other hand, if it is determined in step S16 that air conditioning is prioritized by the user, the process proceeds to step S15, and the power supply control unit 33 determines whether the external supply power P ＥＸ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0066] FIG. 4 shows the accessory power P ＡＣＣ and threshold P ＴＨ 4A is an explanatory diagram showing the relationship between the accessory power P ＡＣＣ is the threshold P ＴＨ The following (here, especially P ＡＣＣ <P ＴＨ 4B is an explanatory diagram of a scene in which the accessory power P ＡＣＣ is the threshold P ＴＨ Scenes that exceed ＡＣＣ >P ＴＨ ) is an explanatory diagram of the output power P ＯＵＴ is the threshold P ＴＨ The vertical axis represents power P [W].

[0067] As shown in FIG. 4A, the accessory power P ＡＣＣ is the threshold P ＴＨ If it is smaller than the accessory power PＡＣＣ is available as required. ＡＣＣ is the output power P of the battery 11 ＯＵＴ Therefore, the battery 11 can use the accessory power P ＡＣＣ In addition, accessory power P ＡＣＣ is the threshold P ＴＨ Therefore, from the viewpoint of the rated current of the fuse 19 (thinness of the cable harness 18) which is a bottleneck, the accessory power A ＰＣＣ Therefore, the power supply control unit 33 can supply all of the auxiliary power P ＡＵＸ , air conditioning power P ＡＩＲ , and external supply power P ＥＸ , respectively, as required by the auxiliary equipment 15, the air conditioner 16, and the external equipment 25.

[0068] On the other hand, as shown in FIG. 4B, the accessory power P ＡＣＣ is the threshold P ＴＨ If it exceeds the accessory power P ＡＣＣ The accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ The battery 11 is within the accessory power P ＡＣＣ However, accessory power P ＡＣＣ is the threshold P ＴＨ is larger than the accessory power P ＡＣＣ If all of the power supplies are supplied, the current flowing through the fuse 19 may exceed the rated current. ＡＣＣ restrictions on

[0069] 5A and 5B are explanatory diagrams showing how the supply power is limited. FIG. 5A shows the state of the air conditioning power P ＡＩＲ 5B is an explanatory diagram of a scene in which the external supply power P ＥＸ5A and 5B are explanatory diagrams of scenes in which the restriction is performed in the dynamic restriction mode. The vertical axis represents power P [W].

[0070] As shown in FIG. 5A, the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ When limiting the external power supply P ＥＸ Therefore, the external device 25 can be used continuously without experiencing a power supply shortage. ＡＩＲ Therefore, the air conditioning power P that is originally required according to the setting of the air conditioning temperature, etc., is limited to the air conditioning power P ＡＩＲ (see FIG. 4B) ＡＩＲ Therefore, the output of the air conditioner 16 may be reduced or stopped. Instead, the accessory power P ＡＣＣ is the threshold P ＴＨ In this case, the air conditioning power P ＡＩＲ is limited, the accessory power P ＡＣＣ is the threshold P ＴＨ That is, even if the cable harness 18 is made thinner and the rated current of the fuse 19 is made smaller than in the past, when the air conditioning device 16 and the external device 25 are used simultaneously, the electric vehicle 100 can supply power to the air conditioning device 16 and the external device 25 without exceeding the durable power of the cable harness 18 and the rated current of the fuse 19.

[0071] As shown in FIG. 5B, the accessory power P ＡＣＣ is the threshold P ＴＨ When the external power supply P ＥＸ When limiting the air conditioning power P ＡＩＲ Therefore, the air conditioner 16 does not experience a power supply shortage, and can continue to be used while maintaining an output according to the air conditioning temperature setting, etc. On the other hand, the external power supply P ＥＸ Therefore, the external device 25 receives the external power supply P ＥＸ (See FIG. 4B)ＥＸ Therefore, the output of the external device 25 may be reduced or the function may be stopped (interrupted). ＡＣＣ is the threshold P ＴＨ In this case, the externally supplied power P ＥＸ is limited, the accessory power P ＡＣＣ is the threshold P ＴＨ That is, even if the cable harness 18 is made thinner and the rated current of the fuse 19 is made smaller than in the past, when the air conditioning device 16 and the external device 25 are used simultaneously, the electric vehicle 100 can supply power to the air conditioning device 16 and the external device 25 without exceeding the durable power of the cable harness 18 and the rated current of the fuse 19.

[0072] In the electric vehicle 100, if the cable harness 18 is made thinner, the rated current of the fuse 19 must be reduced. Therefore, if the air conditioner 16 and the external device 25 are used at the same time, the current flowing through the fuse 19 may exceed the rated current. However, as described above, if the accessory power P ＡＣＣ The threshold P ＴＨ Set the accessory power P ＡＣＣ When this value is exceeded, the air conditioning power P ＡＩＲ or external power supply P ＥＸ and limit the accessory power P ＡＣＣ is the threshold P ＴＨ If the current is kept below this value, even if the cable harness 18 is made thinner, power can be supplied to the air conditioner 16, the external device 25, or both of them so that the current flowing through the fuse 19 does not exceed the rated current.

[0073] As shown in FIG. 5A, the air conditioning power P ＡＩＲ When the power consumption is limited, there is an advantage that the external device 25 can be used normally without running into a power shortage or the like.

[0074] Specifically, the external power supply function of an electric vehicle is an additional function that is permitted when there is a margin, and normally, the vehicle's essential functions, such as running and maintaining the cabin environment, take priority over the external power supply function. ＡＣＣ (Air conditioning power P ＡＩＲ or external power supply P ＥＸ ) must be limited, the external power supply P ＥＸ is usually limited.

[0075] On the other hand, in a scene where the external device 25 is used, the user often weighs the air conditioner 16 and the external device 25 and wants to give priority to continuing to use the external device 25. In such a case, the accessory power P ＡＣＣ While suppressing the air conditioning power consumption P ＡＩＲ A technique for limiting the amount of power consumed by the external device 25 and allowing the external device 25 to continue to be used is very useful. Therefore, the electric vehicle 100 can eliminate the inconvenience of the external device 25 suffering from reduced output or malfunction due to a power shortage, for example.

[0076] In particular, in the electric vehicle 100, the thinness of the cable harness 18 (the rated current of the fuse 19) becomes a bottleneck, and the accessory power P ＡＣＣ When it is necessary to limit the amount of power supplied to the external device 25, the power supply to the external device 25 is prioritized over the air conditioning device 16 based on the user setting (user selection). Therefore, the electric vehicle 100 can accurately meet the above-mentioned user's requests.

[0077] Also, as shown in FIG. 5B, the external supply power P ＥＸ When the temperature is limited, there is an advantage that the air conditioner 16 can be continuously used at an output according to the setting of the air conditioning temperature.

[0078] Specifically, even when using both the air conditioner 16 and the external device 25, depending on the actual situation, such as when the environment is very hot (cold), the user may want to prioritize and maintain the output of the air conditioner 16 by comparing the output of the air conditioner 16 and the external device 25. In such a case, the accessory power PＡＣＣ While suppressing the external supply power P ＥＸ A technique for limiting the amount of heat generated by the air conditioner 16 and maintaining the output of the air conditioner 16 is very useful.

[0079] Second Embodiment In the first embodiment, the output power P ＯＵＴ is the threshold P ＴＨ As described above, the output power P of the battery 11 ＯＵＴ In the second embodiment, the output power P ＯＵＴ is the threshold P ＴＨ This describes a scene that is smaller than

[0080] FIG. 6 shows the output power P ＯＵＴ is the threshold P ＴＨ As shown in FIG. 6, when the SOC (State of Charge) of the battery 11 is decreased, the output power P ＯＵＴ is the threshold P ＴＨ When the accessory power P ＡＣＣ is the threshold P ＴＨ Even if the accessory power P ＡＣＣ This means that the output power P of the battery 11 ＯＵＴ Accessory power P ＡＣＣ In such a case, the electric vehicle 100 adjusts the air conditioning power P ＡＩＲ or external power supply P ＥＸ By limiting the accessory power P ＡＣＣ The output power P of the battery 11 ＯＵＴ It can be reduced to the following:

[0081] 7 is a flowchart of power supply control according to the second embodiment. As shown in FIG. 7, in the second embodiment, the accessory power P ＡＣＣ and threshold P ＴＨ Before step S12, the power supply control unit 33 compares the output power P ＯＵＴ and threshold P ＴＨ Step S20 is added to compare the values ​​of the two.

[0082] In step S20, the output power P of the battery 11 ＯＵＴ is the threshold P ＴＨ If so, the process proceeds to step S12, where the power supply control unit 33 determines whether the accessory power P ＡＣＣ and threshold P ＴＨ When the accessory power PACC is equal to or less than the threshold value PTH, the power supply control unit 33 controls the external power supply P as requested in step S13, as in the first embodiment. ＥＸ and air conditioning power P ＡＩＲ Also, accessory power P ＡＣＣ is the threshold P ＴＨ If it is greater than the predetermined value, the power supply control unit 33 controls the air conditioning power P ＡＩＲ or external power supply P ＥＸ Limit.

[0083] On the other hand, in step S20, the output power P of the battery 11 ＯＵＴ is the threshold P ＴＨ When it is smaller than (P ＯＵＴ <P ＴＨ ), skipping step S12 and proceeding to step S14. That is, as shown in steps S14 to S17, the power supply control unit 33 adjusts the air conditioning power P ＡＩＲ or external power supply P ＥＸ At this time, the power supply control unit 33 limits the accessory power P ＡＣＣ is the output power P of the battery 11. ＯＵＴ The air conditioning power P ＡＩＲ or external power supply P ＥＸ Limit.

[0084] 8A and 8B are explanatory diagrams showing how the supply power is limited in the second embodiment. ＡＩＲ 8B is an explanatory diagram of a scene in which the external supply power P ＥＸ8A and 8B are explanatory diagrams of scenes in which the restriction is performed in the dynamic restriction mode. The vertical axis represents power P [W].

[0085] As shown in FIG. 8A, the output power P ＯＵＴ is the threshold P ＴＨ and the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ When it exceeds ＡＩＲ When limiting the external power supply P ＥＸ Therefore, the external device 25 can be used continuously without experiencing a power supply shortage. ＡＩＲ Therefore, the air conditioning power P that is originally required according to the setting of the air conditioning temperature, etc., is limited to the air conditioning power P ＡＩＲ (see FIG. 6) ＡＩＲ Therefore, the output of the air conditioner 16 may be reduced or stopped. Instead, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ In this case, the air conditioning power P ＡＩＲ is limited, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ can be kept to.

[0086] As shown in FIG. 8B, the output power P ＯＵＴ is the threshold P ＴＨ and the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ When the external power supply P ＥＸ When limiting the air conditioning power P ＡＩＲ Therefore, the air conditioner 16 does not experience a power supply shortage, and can continue to be used while maintaining an output according to the air conditioning temperature setting, etc. On the other hand, the external power supply P ＥＸ Therefore, the external device 25 receives the external power supply P ＥＸ (see FIG. 6) ＥＸTherefore, the output of the external device 25 may be reduced or the function may be stopped (interrupted). Instead, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ In this case, the externally supplied power P ＥＸ is limited, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ can be kept to.

[0087] As described above, the power supply control of the first embodiment is carried out by controlling the output power P ＯＵＴ is the threshold P ＴＨ is smaller than the output power P ＯＵＴ However, this can be used in a situation where there is a bottleneck in the power supply to the air conditioner 16 and the external device 25. ＯＵＴ In a situation where the output power P of the battery 11 is a bottleneck, if the power supply control is performed in accordance with the first embodiment, the electric vehicle 100 can simultaneously use the air conditioner 16 and the external device 25. ＯＵＴ Power can be supplied to the air conditioner 16 and the external device 25 so that the power consumption does not exceed .

[0088] [Modification] In the first and second embodiments, the power supply control unit 33 determines the air conditioning power P ＡＩＲ or external power supply P ＥＸ However, the present invention is not limited to this. For example, in addition to setting the maximum value (upper limit), the power supply control unit 33 may also set the air conditioning power P ＡＩＲ or external power supply P ＥＸ A minimum value (lower limit) can be set for

[0089] For example, the air conditioning power P ＡＩＲ When limiting the maximum value of the air conditioning power P ＡＩＲ A minimum value can be set for the air conditioning power P ＡＩＲWhen the external supply power P ＥＸ When limiting the maximum value of the externally supplied power P ＥＸ A minimum value can be set for the externally supplied power P ＥＸ When the power consumption falls below the minimum value, the power supply control unit 33 can, for example, stop the power supply to the external device 25 .

[0090] The power supply control unit 33 determines the air conditioning power P ＡＩＲ or external power supply P ＥＸ The minimum value (lower limit) for is set in advance based on experiments, simulations, etc., to a minimum level of power that allows the air conditioner 16 or the external device 25 to operate.

[0091] Therefore, the setting of the minimum value (lower limit value) as described above is particularly meaningful in the dynamic limit mode. Specifically, in the dynamic limit mode, the maximum value (upper limit value) dynamically fluctuates, so that the air conditioning power P ＡＩＲ or external power supply P ＥＸ However, there are cases where the power supply falls below the minimum level required to operate the air conditioner 16 or the external device 25. In this case, it is meaningless to continue supplying power at a level that does not allow the air conditioner 16 or the external device 25 to operate, and this is a waste of power. Therefore, in the dynamic limiting mode, a minimum value (lower limit value) is set, and the air conditioning power P ＡＩＲ or external power supply P ＥＸ When the maximum value (upper limit) of falls to or below the minimum value (lower limit), it is preferable to stop the power supply to the air conditioner 16 or the external device 25 .

[0092] In addition, the above-mentioned minimum value (lower limit value) is set by the dynamic limit mode. ＥＸThis is particularly meaningful when limiting the external supply power P. The air conditioner 16 may be able to continue heating with very little power, for example, when using a PTC heater 29 that has already reached a constant temperature (so-called saturation temperature). In contrast, many external devices 25 cannot operate normally unless a certain amount of power is supplied. Therefore, the dynamic limiting mode is used to limit the external supply power P according to the user's settings. ＥＸ When limiting the external power supply P ＥＸ and set the minimum value (lower limit value) for the external power supply P ＥＸ When the maximum value (upper limit) of the power supply voltage Vcc drops to or below the minimum value (lower limit), it is preferable to stop the power supply to the external device 25 .

[0093] In addition, the first and second embodiments can be modified as follows.

[0094] When the SOC of the battery 11 decreases, the output voltage of the battery 11 decreases. Therefore, when attempting to supply a constant amount of power to the external device 25 or the like, the current flowing through the cable harness 18 and the fuse 19 increases. As a result, when the SOC of the battery 11 decreases, a current exceeding the rated current is likely to flow through the cable harness 18 and the fuse 19 in particular. In other words, when the SOC of the battery 11 decreases, the thinness of the cable harness 18 and the rated current of the fuse 19 are likely to become a bottleneck in the power supply to the air conditioner 16 and the external device 25. Therefore, the power supply control unit 33 sets a threshold TH ＳＯＣ is set, and the SOC is set to the threshold value TH ＳＯＣ It is preferable to perform the power supply control of the first or second embodiment when the threshold value TH for the SOC is smaller than ＳＯＣ is determined in advance by adaptation based on experiments, simulations, etc.

[0095] Air conditioning power P ＡＩＲ For example, when the air conditioner 16 has just started to be used, and there is a large difference between the temperature in the vehicle cabin and the temperature setting of the air conditioner, the air conditioning power P ＡＩＲIn such a situation, a current exceeding the rated current is likely to flow through the cable harness 18 and the fuse 19. To put it simply, when the set temperature (target temperature) of the air conditioner 16 is high / low, the thinness of the cable harness 18 and the rated current of the fuse 19 are likely to become a bottleneck in the power supply to the air conditioner 16 and the external device 25. Therefore, the power supply control unit 33 sets the upper limit value UL ＡＩＲ and lower limit LL ＡＩＲ Set the temperature to the upper limit ＡＩＲ When the set temperature exceeds the lower limit LL ＡＩＲ When the upper limit value UL of the set temperature of the air conditioner 16 is less than 100°C, it is preferable to perform the power supply control of the first embodiment or the second embodiment. ＡＩＲ and lower limit LL ＡＩＲ is determined in advance by adaptation based on experiments, simulations, etc.

[0096] In the first and second embodiments, for simplicity, the auxiliary power P ＡＵＸ is a constant value, but this is not limited to this. ＡＵＸ may include power that is truly essential (cannot be reduced), such as the power consumption of the controller 28, as well as power that can be reduced, such as the power consumption of the interior light. ＡＣＣ is the threshold P ＴＨ (in the second embodiment, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ When the auxiliary power P exceeds the predetermined value, the power supply control unit 33 turns off the interior light, etc. ＡＵＸ In this way, the auxiliary power P ＡＵＸ If the air conditioning power P ＡＩＲ or external power supply P ＥＸ The limit amount is reduced.

[0097] In addition, accessory power P ＡＣＣ is the threshold P ＴＨ In the second embodiment, the accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ), the controller 28 (power supply control unit 33) preferably notifies the user via the user interface 34 or the like of a message (advice) urging the user to change the temperature setting of the air conditioning. If the temperature setting of the air conditioning is changed in response to the message, the air conditioning power P ＡＩＲ or external power supply P ＥＸ The accessory power P ＡＣＣ Even if the controller 28 issues the above message or the like, the accessory power P ＡＣＣ When it is necessary to limit the power supply, it is preferable to perform the power supply control of the first or second embodiment.

[0098] The controller 28 can execute the power supply control of the first or second embodiment in combination with one or more of the above-described modifications.

[0099] As described above, the power supply control method according to the first embodiment, the second embodiment, and the modified example is a method for controlling the air conditioning power P , which is the power supplied to the air conditioning device 16 by the control device (controller 28) of the electric vehicle 100 when the battery 11 of the electric vehicle 100 is stopped, to supply power to the air conditioning device 16, the external device 25, and the auxiliary device 15 in the vehicle compartment. ＡＩＲ , and external supply power P which is power supplied to the external device 25 ＥＸ In this power supply control method, the air conditioning power P ＡＩＲ , externally supplied power P ＥＸ , and auxiliary power P which is power supplied to the auxiliary 15 ＡＵＸ The accessory power P ＡＣＣ Calculate the accessory power P ＡＣＣ For the threshold P ＴＨ Set the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0100] In this way, the accessory power P ＡＣＣ is the threshold PＴＨ When the power consumption exceeds the predetermined value and sufficient power cannot be supplied to both the air conditioner 16 and the external device 25, the air conditioning power P ＡＩＲ If the power supply control is performed to limit the air conditioning power P, even if the cable harness 18 is made thinner than before, it is possible to supply power within the range of its endurance power (rated current of the fuse 19). ＡＩＲ and external power supply P ＥＸ When it is necessary to limit either of the external supply power P ＥＸ should be limited, but in the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the air conditioning power P ＡＩＲ This limits the accessory power P ＡＣＣ However, even in situations where power consumption must be limited due to the thinness of the cable harness 18 and the rated current of the fuse 19, the external device 25 can be used continuously without experiencing output reduction or malfunction due to power shortage. When the external device 25 is used in conjunction with the air conditioner 16, many users prefer to prioritize the function of the external device 25, so the continuation of the external device 25 easily meets the user's needs.

[0101] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the threshold value P ＴＨ is determined based on the amount of current that can be supplied from the battery 11 to the air conditioner 16, the external device 25, and the auxiliary machine 15 as a whole.

[0102] In this way, the threshold P is set based on the amount of current that can be supplied from the battery 11 to the air conditioner 16, the external device 25, and the auxiliary device 15 as a whole. ＴＨ When the threshold P ＴＨ is set according to the durable power of the cable harness 18 and the rated current of the fuse 19. Therefore, even if the cable harness 18 is made thinner than before, it is easy to supply power within the range of the durable power (rated current of the fuse 19).

[0103] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the output power P ＯＵＴis supplied with air conditioning power P by the power supply circuit (accessory power box 14). ＡＩＲ , externally supplied power P ＥＸ , and auxiliary power P ＡＵＸ and the threshold P ＴＨ is determined based on the thickness of the cable harness 18 connecting the battery 11 and the power supply circuit (14).

[0104] In this way, the threshold P ＴＨ is set based on the thickness of the cable harness 18, the threshold value P ＴＨ is set directly in accordance with the endurance power of the cable harness 18. Therefore, even if the cable harness 18 is made thinner than before, it is easy to supply power within the range of the endurance power (rated current of the fuse 19).

[0105] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the output power P ＯＵＴ is supplied with air conditioning power P by the power supply circuit (accessory power box 14). ＡＩＲ , externally supplied power P ＥＸ , and auxiliary power P ＡＵＸ and the threshold P ＴＨ is determined based on the rated current of the fuse 19 provided at the connection between the battery 11 and the power supply circuit (14).

[0106] In this way, the threshold P ＴＨ When is set according to the rated current of the fuse 19, the threshold P ＴＨ is set substantially in accordance with the endurance power of the cable harness 18. Therefore, even if the cable harness 18 is made thinner than before, it is easy to supply power within the range of the endurance power (rated current of the fuse 19).

[0107] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ is the threshold P ＴＨ External power supply P ＥＸ and auxiliary power P ＡＵＸ The surplus power PＳＵＲ The air conditioning power P ＡＩＲ Dynamically limit the maximum value of

[0108] In this way, the air conditioning power P ＡＩＲ When limiting the air conditioning power P ＡＩＲ (Limited air conditioning power P ＡＩＲ In the dynamic limiting mode, the maximum value of the surplus power P ＳＵＲ The air conditioning device 16 can be utilized to the maximum extent within the above range.

[0109] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ The air conditioning power P ＡＩＲ Limit.

[0110] In this way, the air conditioning power P ＡＩＲ When limiting the air conditioning power P ＡＩＲ (Limited air conditioning power P ＡＩＲ In the static limiting mode, which fixes the maximum value of the accessory power P ＡＣＣ is the threshold P ＴＨ It's easy to keep it below that.

[0111] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the air conditioning power P ＡＩＲ is the threshold P ＴＨ External power supply P ＥＸ and auxiliary power P ＡＵＸ The surplus power P ＳＵＲ The air conditioning power P ＡＩＲ A dynamic limiting mode that dynamically limits the maximum value of the air conditioning power P ＡＩＲ The air conditioning power P ＡＩＲ and a static limiting mode that limits the accessory power P ＡＣＣ is the threshold P ＴＨ When the air conditioning power P exceeds the limit, the air conditioning power P is limited in either dynamic or static mode depending on the user's settings. ＡＩＲ Limit.

[0112] By being able to switch between the dynamic restriction mode and the static restriction mode in this way, the user can select the usage mode of the air conditioner 16 in which the power supply is restricted, according to the specific situation. For example, if the user wants to maximize air conditioning while prioritizing power supply to the external device 25, this can be achieved by selecting the dynamic restriction mode. On the other hand, if the user only wants to maintain the cabin temperature and prioritizes maintaining the output (function) of the external device 25, this can be achieved by selecting the static restriction mode.

[0113] In the power supply control methods according to the first embodiment, the second embodiment, and the modified example, the accessory power P ＡＣＣ is the threshold P ＴＨ When the air conditioning power P exceeds ＡＩＲ The setting to disable the air conditioning power limit P ＡＩＲ If the limit on accessory power P ＡＣＣ is the threshold P ＴＨ When the external power supply P ＥＸ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0114] In this way, the air conditioning power P ＡＩＲ When the limit on the external power supply P ＥＸ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ This is because the accessory power P ＡＣＣ This is to prevent the power from exceeding the endurance power of the cable harness 18 (the rated current of the fuse 19).

[0115] In the power supply control method according to the second embodiment and the modified example, the output power P ＯＵＴ is the threshold P ＴＨ Smaller and accessory power P ＡＣＣ is the output power P of the battery 11 ＯＵＴ When it exceeds ＡＩＲBy limiting the accessory power P ＡＣＣ The output power P of the battery 11 ＯＵＴ Keep it below.

[0116] In this way, the output power P of the battery 11 decreases due to a decrease in the SOC, etc. ＯＵＴ is the threshold P ＴＨ Air conditioning power P ＡＩＲ If the accessory power P ＡＣＣ The output power P of the battery 11 ＯＵＴ That is, the output power P of the battery 11 can be kept within the range ＯＵＴ is the accessory power P ＡＣＣ Even in a bottleneck scene, the threshold P ＴＨ It is preferable to control the power supply in the same way as in a situation where the endurance power of the cable harness 18 and the rated current of the fuse 19 become a bottleneck. This allows the external device 25 to continue to be used without experiencing output reduction or malfunction due to a power shortage.

[0117] The power supply control device according to the first embodiment, the second embodiment, and the modified example controls the air conditioning power P , which is the power supplied to the air conditioning device 16 when power is supplied from the battery 11 of the electric vehicle 100 that is stopped to the air conditioning device 16, the external device 25, and the auxiliary device 15 in the vehicle compartment. ＡＩＲ , and external supply power P which is power supplied to the external device 25 ＥＸ This power supply control device (controller 28) controls the air conditioning power P ＡＩＲ , externally supplied power P ＥＸ , and auxiliary power P which is power supplied to the auxiliary 15 ＡＵＸ The accessory power P ＡＣＣ Calculate the accessory power P ＡＣＣ For the threshold P ＴＨ Set the accessory power P ＡＣＣ is the threshold P ＴＨ When it exceeds ＡＩＲ By limiting the accessory power P ＡＣＣ is the threshold P ＴＨ Keep it below.

[0118] In this way, the accessory power PＡＣＣ is the threshold P ＴＨ When the power consumption exceeds the predetermined value and sufficient power cannot be supplied to both the air conditioner 16 and the external device 25, the air conditioning power P ＡＩＲ By limiting the accessory power P, even if the cable harness 18 is made thinner than before, power can be supplied within the range of its endurance power (rated current of the fuse 19). ＡＣＣ However, even in situations where power consumption must be limited due to the thinness of the cable harness 18 and the rated current of the fuse 19, the external device 25 can be used continuously without output reduction or malfunction due to power shortage. Furthermore, when using the external device 25 in conjunction with the air conditioner 16, many users prefer to prioritize the functions of the external device 25, so continuous use of the external device 25 is likely to meet the needs of users.

[0119] The above describes embodiments and modifications of the present invention, but the configurations described in the above embodiments and modifications merely illustrate some of the application examples of the present invention and are not intended to limit the technical scope of the present invention.

Claims

1. A power supply control method in which, when power is supplied from the battery of a parked electric vehicle to an air conditioning system in the passenger compartment, external equipment, and auxiliary machinery, a control device of the electric vehicle controls air conditioning power, which is the power supplied to the air conditioning system, and external supply power, which is the power supplied to the external equipment, the power supply control method comprising the steps of: calculating accessory power, which is the total value of the air conditioning power, the external supply power, and the auxiliary equipment power, which is the power supplied to the auxiliary machinery; setting a threshold value for the accessory power; and, when the accessory power exceeds the threshold value, limiting the air conditioning power to keep the accessory power below the threshold value.

2. A power supply control method according to claim 1, wherein the threshold value is determined based on the magnitude of the current that can be supplied from the battery to the air conditioner, the external device, and the auxiliary machinery as a whole.

3. A power supply control method according to claim 2, wherein the output power of the battery is distributed by a power supply circuit to the air conditioning power, the external supply power, and the auxiliary power, and the threshold value is determined based on the thickness of a cable harness connecting the battery and the power supply circuit.

4. A power supply control method according to claim 2, wherein the output power of the battery is distributed by a power supply circuit to the air conditioning power, the external supply power, and the auxiliary power, and the threshold value is determined based on the rated current of a fuse provided at the connection between the battery and the power supply circuit.

5. A power supply control method according to claim 1, wherein, when the accessory power exceeds the threshold, the maximum value of the air conditioning power is dynamically limited so that the air conditioning power is equal to surplus power obtained by subtracting the external supply power and the auxiliary power from the threshold.

6. A power supply control method according to claim 1, wherein when the accessory power exceeds the threshold, the air conditioning power is limited so that the maximum value of the air conditioning power is equal to or less than a predetermined fixed value.

7. A power supply control method as claimed in claim 1, comprising: a dynamic limiting mode that dynamically limits the maximum value of the air conditioning power so that the air conditioning power is equal to the surplus power obtained by subtracting the external supply power and the auxiliary power from the threshold; and a static limiting mode that limits the air conditioning power so that the maximum value of the air conditioning power is equal to or less than a predetermined fixed value, wherein when the accessory power exceeds the threshold, the air conditioning power is limited in either the dynamic limiting mode or the static limiting mode according to a user setting.

8. A power supply control method as claimed in claim 1, comprising: receiving a setting to disable the restriction on air conditioning power when the accessory power exceeds the threshold; and, when the restriction on air conditioning power is disabled, limiting the externally supplied power when the accessory power exceeds the threshold, thereby keeping the accessory power below the threshold.

9. A power supply control method according to claim 1, wherein, when the output power of the battery is smaller than the threshold value and the accessory power exceeds the output power of the battery, the air conditioning power is limited to keep the accessory power equal to or less than the output power of the battery.

10. A power supply control device that controls air conditioning power, which is the power supplied to an air conditioning device in a vehicle cabin, and external supply power, which is the power supplied to the external equipment, when power is supplied from the battery of a parked electric vehicle to the air conditioning device, external equipment, and auxiliary equipment, the power supply control device calculates accessory power, which is the total value of the air conditioning power, the external supply power, and the auxiliary equipment power, which is the power supplied to the auxiliary equipment, sets a threshold value for the accessory power, and when the accessory power exceeds the threshold value, limits the air conditioning power to keep the accessory power below the threshold value.

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