JP2023030474A - Power management system for vehicle - Google Patents

Abstract

[Problem] To improve passenger comfort with respect to an air conditioning function used during external power supply. [Solution] A vehicle power management system includes a battery 10 mounted on a vehicle, an air conditioner 25 for the vehicle compartment, an external power supply device 15, and a power limit determination unit 40A. The air conditioner 25 is driven by power from the battery 10. The external power supply device 15 is capable of supplying power from the battery 10 to electrical equipment 62 outside the vehicle. The power limit determination unit 40A determines whether or not to implement an operation limit on the air conditioner 25 according to the SOC of the battery 10 and the external power supply. [Selected Figure] Figure 10

Description

Disclosed herein is a vehicle power management system that enables SOC management of a vehicle battery through control of external power supply and air conditioning functions.

An air conditioner mounted on a vehicle is provided with a compressor that compresses a refrigerant. In conventional air conditioning systems, the compressor is driven by the internal combustion engine. On the other hand, in a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an electric vehicle (BEV), and a fuel cell electric vehicle (FCEV) having a rotating electric machine as a driving source, instead of using an internal combustion engine as a driving source of the compressor, An electric compressor is used that is driven using the power of the vehicle battery.

By using the electric compressor, it is not necessary to drive the internal combustion engine when using the air-conditioning function, as in conventional vehicles. Therefore, the air-conditioning function can be used even in the IG OFF state, which is a state in which the vehicle cannot travel, for example. .

Further, in plug-in hybrid vehicles and electric vehicles, external power feeding is possible in which the electric power of the on-vehicle battery is fed to external electrical equipment in the IG OFF state. This external power supply enables the use of electrical equipment (eg, cooking appliances) at campsites, evacuation sites, and the like.

Simultaneous use of the external power supply and the air-conditioning function will result in a competition for power from the battery, and there is a risk that the SOC (State Of Charge), which indicates the state of charge of the battery, will suddenly decrease. Therefore, for example, in Patent Document 1, an air conditioner is controlled to operate in a power saving mode during external power feeding. Further, according to Patent Document 2, in an electric vehicle, when the SOC is smaller than the total power amount obtained by summing the power amount for running and the power amount for air conditioning, the operation of the air conditioner is restricted to the destination.

JP 2016-107910 A JP 2011-255686 A

By the way, if the operation of the air-conditioning function is uniformly restricted while the external power supply is being supplied, the comfort of the passenger may be impaired. Therefore, in this specification, a power management system for a vehicle is disclosed that is capable of improving passenger comfort more than before with respect to the air-conditioning function during external power supply.

A vehicle power management system disclosed in this specification includes a battery mounted on a vehicle, an air conditioner for a vehicle interior, an external power supply device, and a determination unit. The air conditioner is driven by battery power. The external power supply device is capable of supplying power from the battery to electrical equipment outside the vehicle. The determination unit determines whether or not to restrict operation of the air conditioner according to the SOC of the battery and the externally supplied power.

According to the above configuration, for example, when the SOC is at a high level or the external power supply is low, air conditioning control can be performed more flexibly than before, such as not limiting the operation of the air conditioner. Crew comfort can be improved.

Further, in the above configuration, even when the SOC of the battery is less than the predetermined battery determination threshold and the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, external power supply from the external power supply device to the electric device is performed. If the electric power is less than a predetermined power supply determination threshold, the determination unit may output the operation restriction cancellation command.

According to the above configuration, even when the SOC of the battery is low, when the externally supplied power is low, execution of operation restriction on the air conditioner can be avoided.

Further, in the above configuration, the SOC of the battery is less than a predetermined battery determination threshold, the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, and the external power supplied from the external power supply device to the electric device is a predetermined amount. is equal to or greater than the power supply determination threshold value, the determination unit may output the operation restriction execution command.

According to the above configuration, when the SOC of the battery is low and the externally-supplied power is high, the operation of the air conditioner is restricted, and the battery is protected while the externally-supplied power is maintained.

Further, in the above configuration, when the SOC of the battery is less than the battery protection threshold, which is lower than the battery determination threshold, the determination unit may output a stop command to stop the operation of the air conditioner and the external power supply device.

According to the above configuration, overdischarge of the battery can be suppressed by stopping the operation of the air conditioner and the external power supply device.

Further, in the above configuration, before outputting the stop command, the determination unit may output a warning command for notifying that the external power feeding by the external power feeding device will be stopped after a predetermined time.

There are a wide variety of electric devices to which external power is supplied, and there is a risk that an electric device that may malfunction due to a sudden power cutoff may become an external power supply target. In preparation for such a case, by issuing a warning before the external power supply is stopped, it is possible to prompt the passenger or other user to stop the electric device.

Further, in the above configuration, the predetermined SOC of the battery is less than the battery determination threshold, the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, and the external power supplied from the external power supply device to the electric device is predetermined. is equal to or greater than the power supply determination threshold value, the determination unit may display a selection screen for selecting which of the air conditioner and the external power supply device is subject to operation restriction on a display visible to the occupant.

According to the above configuration, the occupant can select the operation restriction target.

According to the vehicle power management system according to the present specification, it is possible to improve the comfort of the occupant with regard to the air-conditioning function during external power feeding, compared to the conventional art.

1 is a diagram illustrating a configuration of a vehicle equipped with a vehicle power management system according to an embodiment; FIG. It is a figure explaining an external charge / electric power feeding mechanism. It is a figure explaining an air conditioner. It is a figure explaining the operation example at the time of cooling of an air conditioner. It is a figure explaining the operation example at the time of heating of an air conditioner. It is a figure which illustrates the air-conditioner control panel which operates an air-conditioner. 2 is a diagram illustrating a hardware configuration of an HV-ECU; FIG. It is a figure explaining the operation restrictions of an air conditioner. FIG. 10 is a diagram showing an example when an air conditioning restriction message is displayed on the air conditioner control panel; FIG. 5 is a diagram illustrating a power limit determination flow in the vehicle power management system according to the embodiment; FIG. 10 is a diagram showing an example when a battery protection message is displayed on the air conditioner control panel; FIG. 9 is a diagram showing another example of the power limit determination flow in the vehicle power management system according to the present embodiment; FIG. 10 is a diagram showing an example of displaying a selection screen for restriction target devices on the air conditioner control panel;

FIG. 1 illustrates the overall configuration of a vehicle 100 including a vehicle power management system according to this embodiment. Vehicle 100 may be, for example, a plug-in hybrid electric vehicle (PHEV) that includes internal combustion engine 16 and rotary electric machines MG1 and MG2 as drive sources and is capable of external charging and external power supply.

However, the vehicle 100 is not limited to a plug-in hybrid vehicle, and in short, any vehicle that can use both the air conditioning function and the external power supply when the vehicle cannot run (when the IG is off) may be used. For example, the vehicle 100 may be a hybrid vehicle (HEV) or an electric vehicle (BEV) that includes a rotating electrical machine as a drive source and a battery 10 as a power source.

The battery 10 mounted on the vehicle 100 is composed of, for example, a nickel-metal hydride battery, a lithium-ion battery, or an all-solid-state battery. For example, the capacity of the battery 10 may be 5 kWh or more and 100 kWh or less.

As will be described in detail below, the vehicle power management system according to the present embodiment includes a battery 10, an air conditioner 25 (see FIG. 3), an external charging/power supply device 15 (see FIG. 2), and an HV- It is configured including an ECU 40 .

<External charging/power supply device>
1 and 2, the external charging/power supply device 15 includes an inlet 17, a charger/discharger 20, a junction block 22, a power connector 60, and a plug-in charge ECU 41. As shown in FIG.

Vehicle 100 is capable of so-called plug-in charging, in which battery 10 can be charged from a power supply device outside the vehicle via external charging/power supply device 15 . Referring to FIG. 2, battery 10 can be charged by inserting a plug of an external power supply (not shown) into inlet 17 provided on a side surface (or front surface) of vehicle 100 . Specifically, an inverter built into the charger/discharger 20 converts AC power from an external power source into DC power. Furthermore, the junction block 22 electrically connects the charger/discharger 20 and the battery 10 to charge the battery 10 .

Further, the external charging/power supply device 15 is capable of external power supply, which supplies the electric power of the battery 10 to the electric equipment 62 outside the vehicle. The plug of the power connector 60 is inserted into the inlet 17 for external power supply. By inserting the power connector 60 into the inlet 17, the plug-in charge ECU 41 recognizes that the latter of external charging/external power feeding has been selected. The power connector 60 is provided with an inlet (not shown) into which a plug 61 of an electrical device 62 is inserted.

When the electric device 62 is connected to the charger/discharger 20 via the power connector 60 , the junction block 22 electrically connects the battery 10 and the charger/discharger 20 . The charger/discharger 20 drives an internal inverter to convert the DC power of the battery 10 into AC power. As a result, it becomes possible to supply power to the outside while the battery 10 is converted into, for example, a 100 V AC power supply (maximum power consumption of 1500 W) at 60 Hz.

A mode of using the power of the battery 10 includes a so-called EV power supply mode and an HV power supply mode. In the HV power supply mode, when the SOC of battery 10 decreases, internal combustion engine 16 (see FIG. 1) is started to drive rotating electric machine MG2 as a generator to charge battery 10 .

On the other hand, in the EV power supply mode, the internal combustion engine 16 is not driven, and only the electric power stored in the battery 10 is used for power supply. When the SOC of the battery 10 further drops, power supply is stopped in order to prevent deterioration of the battery 10 due to overdischarge.

For example, the EV power supply mode is selected when camping at night, in areas with idling stop regulations, and when the amount of fuel in the vehicle 100 is less than or equal to a predetermined threshold amount. In addition, in an electric vehicle (BEV) in which the vehicle 100 is not equipped with an internal combustion engine, the EV power feeding mode is exclusively set.

<Air conditioner>
1 and 3, the air conditioner 25 includes, as electric devices, a step-down DC/DC converter 18, an inverter 19, a compressor 33, a blower motor 34A, and a blower fan 34B. 3, the air conditioner 25 includes an outdoor condenser 30, an evaporator 31, an indoor condenser 32, expansion valves 35 and 36, an accumulator 37, and an electromagnetic A valve 38 is provided. In addition, the air conditioner 25 includes an air conditioner ECU 43 and an air conditioner control panel 50 as control system devices.

Referring to FIG. 3, vehicle interior air conditioner 25 mounted in vehicle 100 is a so-called heat pump type air conditioner. Devices of the air conditioner 25 including the compressor 33 and the blower 34 are electric devices driven by power of the battery 10 .

As illustrated in FIG. 1, the blower 34 includes a blower motor 34A and a blower fan 34B. The blower motor 34A may be, for example, a DC motor, and the number of revolutions increases as the applied voltage increases. Blower motor 34A is supplied with power from battery 10 via step-down DC/DC converter 18 . A drive signal (for example, a PWM signal) that determines ON/OFF of the switching element of the step-down DC/DC converter 18 is generated by the air conditioning ECU 43 . A step-down rate is determined based on the duty ratio of the drive signal to the step-down DC/DC converter 18, and accordingly the rotational speeds of the blower motor 34A and the blower fan 34B are determined.

The compressor 33 is an electric type with a built-in motor, and is supplied with electric power from the battery 10 via the inverter 19 as illustrated in FIG. A drive signal (for example, a PWM signal) that determines ON/OFF of the switching element of the inverter 19 is generated by the air conditioning ECU 43 . The rotation speed of the compressor 33 is determined based on the duty ratio of the drive signal.

As the compressor 33, which has conventionally been driven by an internal combustion engine, becomes an electric type such as a motor-driven type, a large amount of electric power is required to obtain driving torque for the compressor 33. For example, electric devices in vehicle 100 that require a large amount of electric power include rotary electric machines MG1 and MG2 that are driving sources, but compressor 33 consumes the next largest amount of electric power. For example, the power consumption of the audio system, navigation system, etc. is in watts [W], while the power consumption of the compressor 33 is in kilowatts [kW].

FIG. 4 illustrates the flow of the refrigerant when the cooling function of the air conditioner 25 is used. Referring to FIG. 4, the high-temperature refrigerant compressed by compressor 33 passes through indoor condenser 32 and is decompressed by expansion valve 35 . After decompression, the refrigerant having a temperature higher than the outside air temperature is radiated when passing through the outdoor condenser 30 . Further, the refrigerant is further decompressed by the expansion valve 36 and becomes a low-temperature, low-pressure mist.

When this refrigerant passes through the evaporator 31, the air in the blower 34 passes through the evaporator 31, and as a result cool air is supplied to the passenger compartment. Both the evaporator 31 and the indoor condenser 32 are accommodated in the same duct, and airflow is controlled by a flap plate (not shown) so that the air from the blower 34 does not pass through the indoor condenser 32 during cooling operation. The refrigerant after heat exchange is gas-liquid separated by the accumulator 37 and the gaseous refrigerant is sent to the compressor 33 .

FIG. 5 illustrates the flow of the refrigerant when the heating function of the air conditioner 25 is used. During heating, air is sent from the blower 34 to the indoor condenser 32 when the high-temperature refrigerant compressed by the compressor 33 passes through the indoor condenser 32 . The air that has passed through the indoor condenser 32 becomes warm air and is supplied to the passenger compartment. At this time, the flap plate in the duct is moved, and the airflow is controlled so that the wind from the blower 34 does not pass through the evaporator 31 .

After passing through the indoor condenser 32 , the refrigerant is decompressed by the expansion valve 35 . The refrigerant, which has been depressurized and has become lower than the outside temperature, absorbs heat when passing through the outdoor condenser 30 . Further, the refrigerant is compressed by compressor 33 via solenoid valve 38 and accumulator 37 .

Referring to FIG. 1, the air volume and set temperature of air conditioner 25 are set by air conditioner control panel 50, which is a display. As illustrated in FIG. 6, the air conditioner control panel 50 is provided on the driver's seat side of the instrument panel.

The air conditioner control panel 50 may be, for example, a touch panel in which an input section and a display section overlap. The air conditioner control panel 50 is provided with air volume operation buttons 51A and 51B, temperature setting buttons 52A and 52B, an auto switch 53, a blower switch 54, an air conditioner switch 55, an inside/outside air switching switch 56, and a display section 57. Since the functions of these buttons and switches are already known, descriptions thereof are omitted here.

The display unit 57 displays a message (see FIG. 9) when air conditioning is restricted and a message (see FIG. 11) for notifying the termination of external power supply, which will be described later. Signals generated by operating various switches and buttons on the air conditioner control panel 50 are sent to the air conditioner ECU 43 (see FIG. 1). Control of the air conditioner 25 by the air conditioning ECU 43 will be described later.

The air conditioner 25 illustrated in FIGS. 3 to 5 can be used even when the vehicle 100 is in a so-called IG OFF state in which the vehicle 100 cannot travel. This function is also called my room function, and it enables the use of air conditioning when sleeping in the car, for example.

On the other hand, if external power supply is also being performed when the My Room function is performed, power is supplied to both from battery 10, and as a result, the SOC of battery 10 decreases. In such a case, the power limit determining unit 40A of the HV-ECU 40 determines whether or not to restrict the operation of the air conditioner 25 according to the SOC of the battery 10 and the externally supplied power, as will be described later.

Qualitatively, when the SOC of the battery 10 is low and the externally supplied power is high, the power limit determining unit 40A causes the air conditioning ECU 43 to limit the operation of the air conditioner 25 . On the other hand, even if the SOC of the battery 10 is low, the power limit determination unit 40A causes the air conditioning ECU 43 to release the operation limit on the air conditioner 25 when the externally supplied power is not so large. In this way, when the SOC of the battery 10 is low, the comfort of the passengers using the air conditioner 25 is improved by flexibly determining whether or not to restrict the operation of the air conditioner 25 according to the magnitude of the external power supply. do.

<ECU>
As illustrated in FIG. 1, a vehicle 100 is provided with a plurality of electronic control units (ECUs). These electronic control units are provided for each function of the vehicle 100, for example. For example, the vehicle 100 includes a plug-in charge ECU 41 that controls the external charging/power supply device 15, and a battery ECU 42 that manages the SOC of the battery 10 and power. In addition, vehicle 100 includes an air conditioning ECU 43 that controls air conditioner 25 , a motor ECU 44 that controls rotating electric machines MG1 and MG2, and an engine ECU 45 that controls internal combustion engine 16 . Furthermore, vehicle 100 includes HV-ECU 40 as a core ECU, also called a central gateway, that integrates these functional ECUs.

The individual functional ECUs can communicate with each other via the HV-ECU 40 . These functional ECUs and the HV-ECU 40 are connected by signal lines conforming to CAN standards (Controller Area Network), for example.

FIG. 7 illustrates the hardware configuration of the HV-ECU 40. As shown in FIG. Other ECUs of vehicle 100 also have the same configuration as in FIG. The HV-ECU 40 (and other ECUs) is composed of, for example, a computer (electronic calculator), and includes an input/output controller 40C, CPU 40D, RAM 40E, ROM 40F, and storage 40G. These devices can communicate with each other via an internal bus 40H.

The input/output controller 40C receives signals output from various sensors and other ECUs mounted on the vehicle 100, and outputs drive commands to onboard equipment such as actuators and lamps. The CPU 40D performs an operation based on the signal received from the input/output controller 40C to generate a drive command, a protection command for the battery 10 (to be described later), and a limit execution command and a limit release command for the air conditioner 25. Send to Storage elements such as the RAM 40E, the ROM 40F, and the storage 40G store control programs, data detected by sensors, and the like.

The CPU 40D executes a control program stored in the storage 40G or the ROM 40F, whereby the HV-ECU 40 includes a power limit determination unit 40A (see FIG. 1) and a display control unit 40B as functional blocks. As will be described later, the power limit determination unit 40A determines whether or not to restrict the operation of the air conditioner 25 . The display control unit 40B also controls the display contents on the air conditioner control panel 50. FIG.

Further, the plug-in charge ECU 41 is configured with a device control section 41A and a power consumption calculation section 41B by the CPU executing a control program stored in the ROM or storage of the plug-in charge ECU 41 .

Power consumption calculation unit 41B calculates external power supply power [W] to be supplied from inlet 17 to electric device 62 outside the vehicle, and transmits the calculated power to power limit determination unit 40A of HV-ECU 40. FIG.

The device control section 41A controls the external charging power/external feeding power by the external charging/feeding device 15 . For example, when the SOC of battery 10 drops and there is a risk of overdischarge, device control unit 41A receives a protection command from power limit determination unit 40A of HV-ECU 40. FIG. In response to this, the device control unit 41A switches the external power supply relay (not shown) that connects the inlet 17 and the battery 10 from the connected state to the disconnected state, thereby stopping the operation of the external charging/power supply device 15 .

In addition, an SOC calculation unit 42A is configured in the battery ECU 42 by the CPU executing a control program stored in the ROM or storage of the battery ECU 42 . SOC calculation unit 42A calculates the SOC of battery 10 and transmits it to power limit determination unit 40A of HV-ECU 40. FIG.

In calculating the SOC, the SOC calculation unit 42A measures the current flowing into and out of the battery 10 based on the current value detected by the current sensor 10A connected to the battery 10, and based on the integrated value (current integrated value). to estimate the SOC of the battery 10 .

In addition, the battery 10 may undergo self-discharge due to a chemical reaction or the like inside thereof, resulting in a decrease in SOC. However, since self-discharge is an internal reaction of the battery and does not involve the inflow and outflow of current to the outside, even if self-discharge occurs, it is not reflected in the integrated current value. As a result, as the self-discharge progresses, the difference between the SOC estimated value based on the current integrated value and the actual SOC increases. Therefore, for example, the SOC calculator 42A estimates the SOC based on the open-circuit voltage value (OCV) of the battery, and corrects the SOC estimated value based on the integrated current value based on this.

The air conditioning ECU 43 includes a device control section 43A and a power consumption calculation section 43B. These functional units are generated by the CPU executing control programs stored in the ROM or storage of the air conditioning ECU 43 .

The power consumption calculator 43B calculates the power consumption of the air conditioner 25 to be controlled. For example, the power consumption calculator 43B calculates power consumption by the compressor 33 based on a command signal (for example, a PWM signal) to the inverter 19 for supplying drive power to the compressor 33 . The power consumption calculation unit 43B also calculates the power consumption by the blower motor 34A based on a command signal (for example, a PWM signal) to the step-down DC/DC converter 18 for supplying drive power to the blower motor 34A. These calculated power consumptions are transmitted to power limit determination unit 40A of HV-ECU 40. FIG.

<Limitation of air conditioning operation>
The device control unit 43A controls the operation of the compressor 33 and the blower fan 34B through command signals to the inverter 19 and the step-down DC/DC converter 18. FIG. For example, the equipment control section 43A controls the voltage applied to the blower motor 34A in accordance with the operation of the air volume operation buttons 51A and 51B of the air conditioner control panel 50 (see FIG. 6).

For example, when the air volume operation button 51A for increasing the air volume is pressed (touched), the device control unit 43A sends a command signal to the step-down DC/DC converter 18 to increase the voltage applied to the blower motor 34A. Increase the duty ratio in

In addition, the device control section 43A controls the rotation speed of the compressor 33 according to the operation of the temperature setting buttons 52A and 52B of the air conditioner control panel 50. FIG. For example, when the temperature setting button 52A for increasing the set temperature is pressed (touched) during cooling operation, the device control unit 43A sends a command signal to the inverter 19 to reduce the rotation speed of the compressor 33. Reduce the duty ratio.

Further, upon receiving a restriction execution command from power restriction determination unit 40A of HV-ECU 40, device control unit 43A restricts the operation of air conditioner 25 based on the air conditioning restriction map illustrated in FIG. In the air-conditioning limit map of FIG. 8, the horizontal axis indicates the SOC of the battery 10, and the vertical axis indicates the upper limit rotation speed of the compressor 33. As shown in FIG. A limiting characteristic line L1 is set on the coordinate plane defined by the horizontal and vertical axes. The limit characteristic line L1 is set, for example, in the shape of a step rising to the right.

For example, when the SOC of the battery 10 is equal to or higher than a predetermined battery determination threshold value SOCth1, the upper limit rotation speed of the compressor 33 can be set up to the maximum rotation speed Rmax. On the other hand, when the SOC of the battery 10 becomes less than the battery determination threshold SOCth1, the upper limit rotation speed of the compressor 33 is reduced stepwise along the characteristic line L1 as the SOC approaches 0. Furthermore, when the SOC of the battery 10 becomes less than the predetermined battery protection threshold SOCth0, the upper limit rotation speed of the compressor 33 becomes 0, and the compressor 33 is stopped.

The SOC of the battery 10 is transmitted from the power limit determination unit 40A to the device control unit 43A together with the limit execution command. In response to this, the device control section 43A turns on the air conditioning power usage limit, and obtains the upper limit rotation speed of the compressor 33 based on the received SOC and the limit characteristic line L1.

After the upper limit rotation speed is obtained, if the required rotation speed of the compressor 33 due to the operation of the temperature setting buttons 52A and 52B of the air conditioner control panel 50 exceeds the upper limit rotation speed, the device control unit 43A Contrary to the operation, the set rotation speed of the compressor 33 is set to the upper limit rotation speed instead of the required rotation speed. Furthermore, as shown in FIG. 9, the display control unit 40B displays a message on the display unit 57 of the air conditioner control panel 50 to the effect that the air conditioning function is restricted because the SOC of the battery 10 is low. Let

In the example of FIG. 8, the compressor 33, which consumes the most power in the air conditioner 25, is subject to operation restriction. In addition, the rotational speed of the blower fan 34B may also be restricted.

<Power limit judgment flow>
Whether or not the above-described air-conditioning operation restriction can be executed is determined according to the determination result in the power restriction determination flow illustrated in FIG. 10 . Note that this flow is performed periodically (for example, 1 minutes).

A power limit determination unit 40A of the HV-ECU 40 acquires the SOC of the battery 10 from the SOC calculation unit 42A of the battery ECU 42. FIG. Further, the power limit determination unit 40A determines whether or not the acquired SOC is less than a predetermined battery protection threshold SOCth0 (S10). The battery protection threshold SOCth0 is set to 20%, for example.

When the SOC of battery 10 is less than battery protection threshold SOCth0, battery 10 may deteriorate due to overdischarge. Therefore, the HV-ECU 40 stops the external charging/power supply device 15 and the air conditioner 25 .

First, the power limit determination unit 40A outputs a warning command to the display control unit 40B before outputting a stop command to the external charging/power supply device 15 and the air conditioner 25. FIG. In response to this, the display control unit 40B causes the display unit 57 of the air conditioner control panel 50 (display) to indicate that the external power supply and the air conditioning function will stop after a predetermined time (for example, 3 minutes), as illustrated in FIG. A message to that effect (battery protection message) is displayed (S12). In particular, with regard to external power supply, there is a wide variety of electrical devices 62 to which power is supplied, and there is a risk of failure due to sudden power interruption. Therefore, by notifying the occupant of the power cutoff before the power cutoff, the occupant can be urged to stop the electrical equipment.

After a predetermined period of time from the display of the battery protection message, the power limit determination unit 40A transmits a stop command to stop the operation of the external charging/power supply device 15 to the device control unit 41A of the plug-in charge ECU 41 (S14). In conjunction with this, the power limit determination unit 40A transmits a stop command for stopping the operation of the air conditioner 25 to the device control unit 43A of the air conditioning ECU 43. After that, the flow of FIG. 10 ends.

Returning to step S10, when the SOC of the battery 10 is equal to or greater than the battery protection threshold SOCth0, the power limit determination unit 40A determines whether the SOC of the battery 10 is less than a predetermined battery determination threshold SOCth1 (>SOCth0). Determine (S16). The battery determination threshold SOCth1 may be 40%, for example.

If SOC≧SOCth1 in step S16, it is determined that the SOC of the battery 10 is sufficient. In response to this, the device control unit 43A turns off the air conditioning power consumption limit (S24). As a result, without setting the upper limit rotation speed based on the limit characteristic line L1 (see FIG. 8), the device control unit 43A operates the compressor based solely on the operation of various switches and buttons on the air conditioner control panel 50 (see FIG. 6). 33 and blower 34 are controlled.

On the other hand, in step S16, when the SOC of the battery 10 is less than the battery determination threshold SOCth1, the operation of the air conditioner 25 is restricted based on the air conditioning restriction map illustrated in FIG. . However, in the power restriction determination flow according to the present embodiment, depending on the determination results of steps S16 to S20, execution of operation restriction is postponed.

In step S16, when the SOC of the battery 10 is less than the battery determination threshold value SOCth1, the power limit determination unit 40A acquires the power consumption of the air conditioner 25 (the power used for air conditioning) from the power consumption calculation unit 43B of the air conditioning ECU 43. . Further, the power limit determination unit 40A determines whether or not the acquired air conditioning power consumption is equal to or greater than a predetermined air conditioning determination threshold Wa_th (S18). The air conditioning determination threshold Wa_th is, for example, the power consumption of the air conditioner 25 when the rotation speed of the compressor 33 is 40% of the maximum rotation speed and the rotation speed of the blower fan 34B is also 40% of the maximum rotation speed. you can

When air conditioning power consumption<Wa_th, it is determined that power consumption by air conditioning is small, and the power limit determination unit 40A transmits a limit cancellation command to the device control unit 43A of the air conditioning ECU 43 (S24). As a result, execution of the air conditioning operation restriction based on the air conditioning restriction map of FIG. 8 is postponed.

On the other hand, if the air conditioning power consumption≧Wa_th in step S18, the power limit determination unit 40A acquires the external power supply from the power consumption calculation unit 41B of the plug-in charge ECU 41 . Further, the power limit determination unit 40A determines whether or not the acquired external power supply power is equal to or greater than a predetermined power supply determination threshold value Wd_th (S20). For example, the power supply determination threshold Wd_th may be Wd_th=800 W when the maximum power consumption that can be externally supplied from the battery 10 is 1500 W, as described above.

If the externally supplied power <Wd_th, the power limit determination flow proceeds to step S24. That is, the power limit determination unit 40A transmits a limit cancellation command to the device control unit 43A of the air conditioning ECU 43, and the device control unit 43A receives this command and turns off the power consumption limit for the air conditioner.

On the other hand, when the externally supplied power≧Wd_th, the power limit determination unit 40A outputs a limit execution command to the device control unit 43A of the air conditioning ECU 43 . In response to this, the device control unit 43A turns on the air conditioning power usage limit (S22), and executes air conditioning operation limit control based on the air conditioning limit map of FIG.

As described above, in the vehicle power management system according to the present embodiment, even if the SOC of the battery 10 is less than the battery determination threshold SOCth1 at which air conditioning operation restriction is originally performed, the restriction is temporarily suspended. Then, when at least one of the case where the air conditioning power consumption is small and the case where the externally supplied power is small is satisfied, the air conditioning operation restriction is not performed. As a result, the conditions under which the air-conditioning function can be used without restriction are expanded, and the convenience for passengers can be improved, compared to the case where the air-conditioning operation is uniformly restricted according to the SOC of the battery 10, for example.

<Another example of power limit determination flow>
FIG. 12 shows another example of the power limit determination flow according to this embodiment. In FIG. 12, the steps with the same reference numerals as those in FIG. 10 have the same processing contents, and therefore description thereof will be omitted as appropriate.

In the flow exemplified in FIG. 12, if the externally supplied electric power≧Wd_th in step S20, the HV-ECU 40 selects one of the external charging/electrical supply device 15 and the air conditioner 25 as the target of the electric power limitation. to select.

In the power limit determination flow in FIG. 10 showing the first embodiment, in order to protect the electric equipment 62 outside the vehicle, the power used for air conditioning is limited while the externally supplied power is maintained. Specifically, for example, assuming that the electrical equipment 62 is equipment with a higher degree of importance than the air conditioner 25, such as a cooking appliance in an evacuation shelter, the external power supply is maintained while the air conditioning power consumption is maintained. is restricted.

However, some occupants using the air-conditioning function may choose to stop power supply to the electric device 62 while maintaining the air-conditioning function. For example, this is the case when a child suffering from heat stroke is allowed to rest in the car.

Therefore, in the power limit determination flow in FIG. 12, in step S30, the power limit determination unit 40A causes the air conditioner control panel 50, which is a display device, to display a selection screen for allowing the passenger to select an operation restriction target via the display control unit 40B. 57 to display it.

Specifically, as exemplified in FIG. 13, the display control unit 40B causes the display unit 57 of the air conditioner control panel 50 to restrict operation of one of the external power supply and the air conditioning function in order to protect the SOC of the battery 10. display a message explaining Along with this, the display control unit 40B causes the display unit 57 to display an external power supply selection button 57A and an air conditioning selection button 57B, which allow the passenger to select a target to be restricted.

The power limit determination unit 40A determines which of the external power supply selection button 57A and the air conditioning selection button 57B is pressed (touched) (S32). Then, when the air-conditioning selection button 57B is pressed down, the power limit determination unit 40A outputs a limit execution command to the device control unit 43A. As a result, the air conditioning power consumption limit is turned on in the device control section 43A (S22). Further, the power limit determination unit 40A outputs a limit release command to the device control unit 41A of the plug-in charge ECU 41. FIG. As a result, the device control section 41A turns off the external power supply limit (S36).

On the other hand, when the external power supply selection button 57A is pressed in step S32, the power limit determination unit 40A outputs a limit execution command to the device control unit 41A of the plug-in charge ECU 41. As a result, the device control section 41A turns on the external power supply limit (S34). For example, if the maximum power consumption that can be externally supplied from the battery 10 is 1500 W when the external power supply power is not restricted, the maximum power consumption that can be externally supplied is limited to 800 W when the external power supply is restricted. be done.

After the external power supply power limitation is set to ON, the power limitation determination unit 40A outputs a limitation cancellation command to the device control unit 43A of the air conditioning ECU 43. As a result, the equipment control unit 43A turns off the air conditioning power consumption limit (S24).

13, the selection message, the external power supply selection button 57A and the air conditioning selection button 57B are displayed on the display section 57 of the air conditioner control panel 50. FIG. Instead of or in addition to this, the display control unit 40B may cause the display unit of the user's portable terminal, which has been registered in advance in the storage 40G of the HV-ECU 40, to display the above message and button.

10 battery, 17 inlet, 18 step-down DC/DC converter, 19 inverter, 20 charger/discharger (feeder), 25 air conditioner, 30 outdoor condenser, 31 evaporator, 32 indoor condenser, 33 compressor, 34 blower, 34A blower motor, 34B Blower fan, 35, 36 expansion valve, 37 accumulator, 38 solenoid valve, 40 HV-ECU, 40A power limit determination unit, 40B display control unit, 41 plug-in charge ECU, 41A, 43A device control unit, 41B, 43B power consumption Calculation unit 42 Battery ECU 42A SOC calculation unit 43 Air conditioning ECU 43A Equipment control unit 43B Power consumption calculation unit 44 Motor ECU 45 Engine ECU 50 Air conditioner control panel (display) 51A, 51B Air volume operation button , 52A, 52B temperature setting button, 57 display unit, 57A external power supply selection button, 57B air conditioning selection button, 60 power connector, 61 plug, 62 electrical equipment, 100 vehicle.

Claims (6)

the battery installed in the vehicle,
an air conditioner for a passenger compartment driven by the electric power of the battery;
an external power supply device capable of supplying electric power of the battery to an electric device outside the vehicle;
a determination unit that determines whether or not to restrict operation of the air conditioner according to the SOC of the battery and the external power supply;
A power management system for a vehicle, comprising: The vehicle power management system according to claim 1,
Even when the SOC of the battery is less than the predetermined battery determination threshold and the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, externally supplied power from the external power supply device to the electric device. is less than a predetermined power supply determination threshold, the determination unit outputs a command to cancel the operation restriction. The vehicle power management system according to claim 1,
The SOC of the battery is less than a predetermined battery determination threshold, the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, and the externally supplied power from the external power supply device to the electric device is a predetermined The power management system for a vehicle, wherein the determination unit outputs the operation restriction execution command when the power supply determination threshold is exceeded. The vehicle power management system according to claim 2 or 3,
Vehicle power management, wherein when the SOC of the battery is less than a battery protection threshold that is lower than the battery determination threshold, the determination unit outputs a stop command to stop the operation of the air conditioner and the external power supply device. system. The vehicle power management system according to claim 4,
The vehicular power management system, wherein, before outputting the stop command, the determination unit outputs a warning command to notify that the external power feeding by the external power feeding device will be stopped after a predetermined time. The vehicle power management system according to claim 1,
The SOC of the battery is less than a predetermined battery determination threshold, the power consumption of the air conditioner is equal to or greater than the predetermined air conditioning determination threshold, and the externally supplied power from the external power supply device to the electric device is a predetermined When the power supply determination threshold is greater than or equal to the power supply determination threshold, the determination unit causes a display visible to the occupant to display a selection screen for selecting which of the air conditioning device and the external power supply device is subject to operation restriction. power management system.

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