JP2005045883A - Hybrid vehicle - Google Patents

Hybrid vehicle Download PDF

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Publication number
JP2005045883A
JP2005045883A JP2003201107A JP2003201107A JP2005045883A JP 2005045883 A JP2005045883 A JP 2005045883A JP 2003201107 A JP2003201107 A JP 2003201107A JP 2003201107 A JP2003201107 A JP 2003201107A JP 2005045883 A JP2005045883 A JP 2005045883A
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JP
Japan
Prior art keywords
engine
power
storage device
power storage
hybrid vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2003201107A
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Japanese (ja)
Inventor
Kazuhiro Hara
Minoru Suzuki
一広 原
実 鈴木
Original Assignee
Honda Motor Co Ltd
本田技研工業株式会社
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Application filed by Honda Motor Co Ltd, 本田技研工業株式会社 filed Critical Honda Motor Co Ltd
Priority to JP2003201107A priority Critical patent/JP2005045883A/en
Publication of JP2005045883A publication Critical patent/JP2005045883A/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00Electric propulsion with power supplied within the vehicle
    • B60L50/10Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14Preventing excessive discharging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00Converter types
    • B60L2210/10DC to DC converters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00Converter types
    • B60L2210/40DC to AC converters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2270/00Problem solutions or means not otherwise provided for
    • B60L2270/20Inrush current reduction, i.e. avoiding high currents when connecting the battery
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y02T10/7077Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors on board the vehicle
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7216DC to DC power conversion
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7241DC to AC or AC to DC power conversion

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid vehicle wherein a power storage device is prevented from being overdischarged. <P>SOLUTION: When the remaining capacity SOC of a high-voltage battery 5 falls below a predetermined SOC1 during idle stop, ECU 11 limits the output of an electric compressor 16 to reduce power consumed. When the remaining capacity SOC falls below a predetermined SOC2, the ECU 11 limits the output of a DC-DC converter 9 to reduce power consumed. When the remaining capacity SOC further falls below a predetermined SOC3, the ECU 11 restarts an engine 2. If the engine 2 cannot be restarted at this time, the ECU 11 stops the operation of the electric compressor 16 and the DC/DC converter 9 to prevent the power of the high-voltage battery 5 from being consumed, and then restarts the engine 2 again. If the engine 2 cannot be restarted and the remaining capacity SOC falls below a predetermined SOC4, the ECU 11 disconnects a main contactor means 4 and an air conditioner contactor means 13 to completely stop discharging of the high-voltage battery 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid vehicle capable of traveling with the power of at least one of an engine and a traveling motor.
[0002]
[Prior art]
Conventionally, in a hybrid vehicle that can be driven by the power of at least one of an engine and a driving motor, an overdischarge state of the battery is detected, and a charge / discharge amount is provided for battery protection according to the detected overdischarge state. Some of them have a control device for controlling the above. This control device is connected to the engine that outputs the propulsive force of the vehicle, a motor that generates auxiliary driving force that assists the output of the engine, supplies power to the motor, and requires auxiliary driving force. A battery that operates the motor as a generator when not in use and charges the obtained electrical energy, a contactor that interrupts the current supply between the battery and the motor, and the electric power that is generated by the motor and the electric load that is supplied by the battery And an engine stop means for stopping the engine in accordance with a predetermined operating condition, and when overdischarge of the battery is detected when the engine is in an idling operation state, the power supply to the electric load is stopped, and the battery when the engine is in the stop state. And battery protection means for disconnecting the contactor when an overdischarge is detected.
[0003]
Thus, in the above-described hybrid vehicle, in order to improve the fuel efficiency of the vehicle, the engine is stopped when the vehicle stops while waiting for a signal or during a traffic jam, and the driving force of the motor is used when the vehicle starts again. It realizes an idle stop function that restarts the engine and immediately starts running. In addition, in order to maintain the motor drive power required when restarting the engine, when the engine detects an overdischarge of the battery in the idling operation state, the power supply to the electric load is stopped and the engine is stopped. When overdischarge of the battery is detected in the state, the contactor is disconnected to completely stop the discharge of the battery, and the battery is protected (for example, refer to Patent Document 1).
Moreover, when the remaining capacity of a battery becomes below a predetermined value, there are some which restart a stopped engine and charge a battery by a predetermined amount (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-119808 [Patent Document 2]
Japanese Patent Laid-Open No. 7-250404
[Problems to be solved by the invention]
However, in the control device described in Patent Document 1, when the battery is overdischarged while the engine is stopped, in order to protect the battery, the contactor can be disconnected to completely stop the battery discharge. However, disconnecting the contactor means stopping the power supply to the motor, and there is a problem that it takes time to restart the engine.
Further, in order to protect the battery without cutting the contactor, it is necessary to restart the engine even when the vehicle is stopped, as in the technique described in Patent Document 2, so that the fuel consumption of the vehicle cannot be improved. There was a problem.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a hybrid vehicle that prevents overdischarge of a power storage device.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a hybrid vehicle according to the invention of claim 1 is driven by at least one power of an engine (for example, the engine 2 of the embodiment) or a traveling motor (for example, the traveling motor 1 of the embodiment). A hybrid vehicle that travels and is capable of automatically stopping and restarting the engine under predetermined conditions, and that stores and recharges electric power when the traveling motor is driven or regenerated (for example, the A voltage battery 5), a voltage converter (for example, the DC / DC converter 9 of the embodiment) that converts electric power of the power storage device into electric power having a lower potential than the power, and control for controlling charge / discharge of the power storage device (E.g., the ECU 11 of the embodiment), and the controller controls the amount of power stored in the power storage device while the engine is stopped under a predetermined condition. When the lower threshold value (e.g., provision of Embodiment SOC2), and limits the output of the voltage converter.
[0008]
The hybrid vehicle having the above configuration limits the output of the voltage converter when the amount of power stored in the power storage device that charges and discharges electric power as the driving motor is driven or regenerated is below the converter control threshold. Thus, it is possible to reduce the power consumption of the power storage device by the voltage converter and prevent the power storage device from being overdischarged.
[0009]
The hybrid vehicle according to a second aspect of the present invention is the hybrid vehicle according to the first aspect, wherein the controller controls the converter to control the amount of power stored in the power storage device while the engine is stopped under a predetermined condition. The engine is restarted when the converter stop threshold value (for example, the prescribed SOC3 in the embodiment) is smaller than the threshold value.
[0010]
The hybrid vehicle having the above configuration reduces the power consumption of the power storage device by the voltage converter, thereby preventing the power storage device from being overdischarged, and the power storage amount of the power storage device is less than the converter control threshold value. When the value falls below the small converter stop threshold, the power generated by the traveling motor is supplied to the voltage converter and the power storage device using the power of the engine, and the power storage device can be prevented from being overdischarged.
[0011]
A hybrid vehicle according to a third aspect of the invention is characterized in that, in the hybrid vehicle according to the second aspect, the control unit stops the operation of the voltage converter and restarts the engine again.
[0012]
In the hybrid vehicle having the above configuration, in order to prevent the power storage device from being overdischarged, when power is generated by the traveling motor using the power of the engine, the amount of power stored in the power storage device is small. If the engine cannot be restarted by driving the motor for the first time, the operation of the voltage converter is stopped, and the power consumption of the power storage device by the voltage converter is stopped, so that it remains in the power storage device. All the stored power can be used to restart the engine.
[0013]
A hybrid vehicle according to a fourth aspect of the invention travels with the power of at least one of an engine (for example, the engine 2 of the embodiment) or a traveling motor (for example, the traveling motor 1 of the embodiment), and under predetermined conditions. In the hybrid vehicle capable of automatically stopping and restarting the engine, the vehicle air conditioner (for example, the vehicle air conditioner 14 of the embodiment) that can be driven by an electric motor (for example, the electric compressor 16 of the embodiment). And a power storage device (for example, the high voltage battery 5 of the embodiment) that charges and discharges electric power with driving or regeneration of the travel motor and supplies power to the electric motor, and the power of the power storage device A voltage converter (for example, the DC / DC converter 9 of the embodiment) that converts electric power into electric power having a lower potential than the electric power, and charging / discharging of the power storage device A control unit (for example, the ECU 11 of the embodiment), and the control unit determines that the amount of power stored in the power storage device is an air conditioning control threshold value (for example, the regulation of the embodiment) while the engine is stopped under a predetermined condition. When the value falls below SOC1), the output is limited if the vehicle air conditioner is in operation.
[0014]
The hybrid vehicle having the above-described configuration charges and discharges electric power as the driving motor is driven or regenerated, and the amount of power stored in the power storage device that supplies power to the electric motor of the vehicle air-conditioning device has an air conditioning control threshold value. If the vehicle air conditioner is lower than that, the output of the vehicle air conditioner is limited to reduce the power consumption of the power storage device by the electric motor, thereby preventing the power storage device from being overdischarged.
[0015]
A hybrid vehicle according to a fifth aspect of the present invention is the hybrid vehicle according to the fourth aspect, wherein the control unit further controls the air-conditioning of the power storage amount of the power storage device while the engine is stopped under a predetermined condition. The output of the voltage converter is limited when the converter control threshold value is smaller than a threshold value (for example, the prescribed SOC2 of the embodiment).
[0016]
In the hybrid vehicle having the above configuration, the electric motor and the voltage conversion are controlled by limiting the output of the voltage converter when the amount of power stored in the power storage device falls below the converter control threshold smaller than the air conditioning control threshold. The power consumption of the power storage device by the battery can be reduced, and the power storage device can be more reliably prevented from being overdischarged.
[0017]
A hybrid vehicle according to a sixth aspect of the present invention is the hybrid vehicle according to the fifth aspect, wherein the controller controls the converter to control the amount of power stored in the power storage device while the engine is stopped under a predetermined condition. The engine is restarted when the converter stop threshold value (for example, the prescribed SOC3 in the embodiment) is smaller than the threshold value.
[0018]
The hybrid vehicle having the above configuration reduces the power consumption of the power storage device by the electric motor, thereby preventing the power storage device from being overdischarged, and the power storage amount of the power storage device is smaller than the converter control threshold value. When the converter stop threshold value is exceeded, the power generated by the traveling motor is supplied to the electric motor, voltage converter, and power storage device using the power of the engine, preventing the power storage device from being overdischarged. it can.
[0019]
The hybrid vehicle according to a seventh aspect of the present invention is the hybrid vehicle according to the sixth aspect, wherein the control unit stops the operation in the order of the electric motor and the voltage converter and restarts the engine again. It is characterized by that.
[0020]
In the hybrid vehicle having the above configuration, in order to prevent the power storage device from being overdischarged, when power is generated by the traveling motor using the power of the engine, the amount of power stored in the power storage device is small. If the engine cannot be restarted by driving the motor for the first time, the operation of the electric motor and voltage converter of the vehicle air conditioner is stopped, and the power consumption of the power storage device by the electric motor and voltage converter is stopped. By stopping the operation, all of the stored electric power remaining in the power storage device can be used to restart the engine.
[0021]
The hybrid vehicle according to an eighth aspect of the invention is the hybrid vehicle according to the third or seventh aspect, wherein the hybrid vehicle is provided in series with an input / output terminal of the power storage device, and power input / output to / from the power storage device is intermittently provided. Opening and closing means (for example, main contactor means 4 and air conditioner contactor means 13 of the embodiment), and the control unit further converts the amount of electricity stored in the power storage device while the engine is stopped under a predetermined condition. When the opening / closing means disconnection threshold value (for example, the prescribed SOC 4 of the embodiment) is smaller than the device stop threshold value, the opening / closing means is disconnected.
[0022]
In the hybrid vehicle having the above configuration, even if the power consumption of the power storage device by the load device connected to the power storage device is reduced, the power consumption of the power storage device is not stopped due to, for example, a failure of the load device. Prevents the power storage device from being overdischarged by disconnecting the switching means that intermittently inputs and outputs power to the power storage device when the amount of power stored in the device falls below the switching means disconnection threshold value that is smaller than the converter stop threshold. it can.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(overall structure)
FIG. 1 is a block diagram showing a configuration of a hybrid vehicle according to an embodiment of the present invention. In FIG. 1, a traveling motor 1 is mounted on a vehicle and is a three-phase motor whose rotor is connected to the engine 2 of the vehicle so as to assist the engine 2 that drives the vehicle or to drive the vehicle. The electric motor enables motor-driven traveling by the traveling motor 1 alone and assist traveling in which the traveling motor 1 assists the driving force when traveling by the engine 2.
[0024]
Further, a power drive unit (Power Drive Unit: hereinafter abbreviated as PDU) 3 as a motor control unit mainly composed of an inverter circuit is connected to the traveling motor 1. The PDU 3 includes a smoothing capacitor 3 a that stabilizes the power supply voltage, and the smoothing capacitor 3 a is connected to a high voltage battery (power storage device) 5 mounted on the vehicle via the main contactor means 4. Here, as the high voltage battery 5, for example, a 144 [V] battery can be used.
[0025]
The PDU 3 obtains DC power from the high-voltage battery 5 in a state where the main contactor means 4 is conducted, converts the DC power into three-phase AC power, and drives the traveling motor 1. The regenerative power of the traveling motor 1 is converted into DC power to charge the high voltage battery 5. In addition, the current sensor 6 and the voltage sensor 7 are connected to the high voltage battery 5, the input / output current Abatt of the high voltage battery 5 detected by the current sensor 6, and the high voltage battery 5 detected by the voltage sensor 7. From the input / output voltage Vbatt, the remaining capacity SOC of the high voltage battery 5 can be estimated based on the IV (current-voltage) characteristics of the high voltage battery 5 and the current integrated value.
[0026]
On the other hand, the main contactor means 4 includes a main contactor 4a which is an opening / closing means such as a relay, contactor, switch, etc. that can be connected between terminals by providing a mechanism that can automatically open and close the circuit, and the main contactor 4a. Are provided with a precharge contactor 4b and a precharge resistor 4c, which are similar opening / closing means provided in parallel. Thereby, when the PDU 3 and the high voltage battery 5 are connected via the main contactor means 4, first, the precharge contactor 4b is operated (conducted) to precharge the smoothing capacitor 3a of the PDU 3, By operating (conducting) the main contactor 4a, it is possible to prevent damage to the contactor due to the inrush current to the smoothing capacitor 3a. Moreover, the voltage sensor 8 is connected to the smoothing capacitor 3a, and the operation timing of the main contactor 4a can be adjusted according to the voltage value detected by the voltage sensor 8.
[0027]
A DC / DC converter 9 is connected to the high voltage battery 5 via the main contactor 4, and the DC / DC converter 9 converts the high voltage DC power obtained from the high voltage battery 5 to the low voltage DC power. The low-voltage battery 10 is charged by stepping down to Further, from the low voltage battery 10, an electronic control unit (hereinafter referred to as ECU) 11 which is a control unit in the hybrid vehicle of the present embodiment, which will be described later, an auxiliary machine 12 which is driven at a low voltage, and the like. Low voltage (for example, 14.5 [V]) DC power is supplied to a low voltage system circuit (for example, 12 [V] system circuit).
[0028]
Furthermore, a hybrid air conditioner unit (hereinafter abbreviated as HBACU) 15 for operating a vehicle air conditioner 14 mounted on the vehicle is connected to the high voltage battery 5 via an air conditioner contactor 13. Here, like the main contactor means 4, the air conditioner contactor means 13 includes a main contactor 13a as an opening / closing means, a precharge contactor 13b as an opening / closing means, and a precharge resistor 13c. The HBACU 15 includes a driver 15a having an inverter circuit, a controller 15b for controlling the driver 15a, and a smoothing capacitor 15c connected to the air conditioner contactor means 13.
[0029]
Thus, as in the case of the main contactor means 4, when the HBACU 15 and the high voltage battery 5 are connected via the air conditioner contactor 13, the precharge contactor 13 b is first activated (conducted) to smooth the HBACU 15. After the capacitor 15c is precharged, the main contactor 13a is actuated (conducted), whereby the contactor can be prevented from being damaged by the inrush current to the smoothing capacitor 15c.
[0030]
The driver 15a of the HBACU 15 is provided in the vehicle air conditioner 14 and is connected to an electric compressor 16 that is a compression device that can operate using a three-phase motor (electric motor) as a power source. The HBACU 15 is an air conditioner contactor. In a state where the means 13 is conducted, the DC power supplied from the high voltage battery 5 is converted into three-phase AC power by the driver 15a, and the electric compressor 16 is driven.
[0031]
Moreover, the voltage sensor 17 is connected to the smoothing capacitor 15c, and the operation timing of the main contactor 13a can be adjusted according to the voltage value detected by the voltage sensor 17. Further, a fuse 18 is connected between the high voltage battery 5 and the air conditioner contactor means 13 so that the current path between the high voltage battery 5 and the air conditioner contactor means 13 can be interrupted when overcurrent occurs.
[0032]
Furthermore, the hybrid vehicle of the present embodiment includes an engine-driven compressor 19 that is a compression device that can operate using the engine 2 as a power source. Specifically, power is transmitted from the engine 2 to the engine drive compressor 19 by the drive belt 21 via a pulley 20 a connected to the output shaft of the engine 2 and a pulley 20 b connected to the rotation shaft of the engine drive compressor 19. The Therefore, the vehicle air conditioner 14 adjusts the temperature in the vehicle by driving either or both of the electric compressor 16 and the engine drive compressor 19 as a compression device.
[0033]
Further, the output signals of the current sensor 6, the voltage sensor 7, the voltage sensor 8, and the voltage sensor 17 are input to the ECU 11. The ECU 11 also receives an ON / OFF signal IG_SW for an ignition switch of the vehicle, an ON / OFF signal AC_SW for an operation switch of the air conditioner 14 for the vehicle, and an electrical signal corresponding to the rotational speed of the traveling motor 1. On the other hand, the ECU 11 outputs control signals to the main contactor unit 4, the PDU 3, the DC / DC converter 9, and the controller 15 b included in the HBACU 15.
[0034]
Similarly, the ECU 11 outputs a control signal to the air conditioner contactor means 13 via the controller 15b of the HBACU 15.
When the traveling motor 1 is directly connected to the output shaft of the engine 2, the motor rotation speed matches the rotation speed of the engine 2, so that the rotation speed of the engine 2 can be substituted for the motor rotation speed.
[0035]
(Battery overdischarge protection operation)
Next, the battery overdischarge protection operation by the ECU 11 will be described with reference to the drawings. FIG. 2 is a flowchart showing a battery overdischarge protection operation by the ECU 11 of the hybrid vehicle of the present embodiment.
In FIG. 2, first, the ECU 11 determines whether or not the current control is during idle stop (step S1).
In step S1, when the current control is not during idle stop (NO in step S1), the ECU 11 ends the battery overdischarge protection operation as it is.
On the other hand, when the current control is in idling stop in step S1 (YES in step S1), the ECU 11 determines whether or not the remaining capacity SOC of the high voltage battery 5 is smaller than the specified SOC1 (step S2). .
[0036]
In step S2, when the remaining capacity SOC of the high voltage battery 5 is equal to or higher than the specified SOC1 (NO in step S2), the ECU 11 performs normal charge / discharge control without performing overdischarge protection control of the high voltage battery 5. (Step S3) and the battery overdischarge protection operation is terminated.
On the other hand, when the remaining capacity SOC of the high-voltage battery 5 is smaller than the prescribed SOC1 in step S2 (YES in step S2), the ECU 11 executes output limitation of the electric compressor 16 included in the vehicle air conditioner 14 to The electric power consumed by the compressor 16 is reduced (step S4).
[0037]
Next, it is determined whether or not the remaining capacity SOC of the high voltage battery 5 is smaller than the prescribed SOC2 (provided that the prescribed SOC2 <the prescribed SOC1) (step S5).
In step S5, when the remaining capacity SOC of the high-voltage battery 5 is equal to or greater than the specified SOC2 (NO in step S5), the ECU 11 ends the battery overdischarge protection operation while executing the output restriction of the electric compressor 16.
On the other hand, when the remaining capacity SOC of the high voltage battery 5 is smaller than the specified SOC2 in step S5 (YES in step S5), the ECU 11 decreases the output voltage from 14.5 [V] to 12.3 [V], for example. The output restriction of the DC / DC converter 9 to be performed is executed, and the power consumed by the DC / DC converter 9 and the auxiliary machines 12 connected to the output of the DC / DC converter 9 is reduced (step S6).
[0038]
Next, it is determined whether or not the remaining capacity SOC of the high voltage battery 5 is smaller than the prescribed SOC3 (provided that the prescribed SOC3 <the prescribed SOC2 <the prescribed SOC1) (step S7).
In step S7, when the remaining capacity SOC of the high-voltage battery 5 is equal to or greater than the specified SOC3 (NO in step S7), the ECU 11 remains executing the output limitation of the electric compressor 16 and the output limitation of the DC / DC converter 9 Then, the battery overdischarge protection operation is terminated.
[0039]
On the other hand, if the remaining capacity SOC of the high voltage battery 5 is smaller than the specified SOC 3 in step S7 (YES in step S7), the engine 2 is restarted, and if the engine 2 cannot be restarted, Stop the operation of the compressor 16 and the DC / DC converter 9 in this order, and stop the power supply to the electric compressor 16, the DC / DC converter 9, and the auxiliary machinery 12 connected to the output of the DC / DC converter 9. Then, the engine 2 is restarted again (step S8).
[0040]
Next, it is determined whether or not the remaining capacity SOC of the high-voltage battery 5 is smaller than the prescribed SOC4 (provided that the prescribed SOC4 <the prescribed SOC3 <the prescribed SOC2 <the prescribed SOC1) (step S9).
In step S9, when the remaining capacity SOC of the high voltage battery 5 is equal to or higher than the specified SOC4 (NO in step S9), the ECU 11 performs the battery overdischarge protection operation with the electric compressor 16 and the DC / DC converter 9 stopped. finish.
On the other hand, when the engine 2 cannot be started in step S9 and the remaining capacity SOC of the high voltage battery 5 is smaller than the prescribed SOC4 (YES in step S9), the ECU 11 prevents the high voltage battery 5 from discharging. Then, the main contactor means 4 and the air conditioner contactor means 13 are disconnected to completely stop the discharge of the high voltage battery 5 (step S10).
[0041]
In the above-described battery overdischarge protection operation, when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the specified SOC1, first, the output restriction of the electric compressor 16 is first executed to reduce the power consumption. After the remaining capacity SOC became smaller than the specified SOC2, the output restriction of the DC / DC converter 9 was executed next to reduce the power consumption. However, the output restriction was executed to prevent the battery from being over-discharged. The device for reducing the power consumption may be either the electric compressor 16 or the DC / DC converter 9.
[0042]
Specifically, when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the specified SOC1, the output restriction of either the electric compressor 16 or the DC / DC converter 9 is executed to reduce the power consumption, and the high voltage battery 5 When the remaining capacity SOC becomes smaller than the prescribed SOC3, the engine 2 is restarted. If the engine 2 cannot be restarted at this time, all the operations of the electric compressor 16 and the DC / DC converter 9 that are in operation are stopped, and the power supply to these devices is stopped. The engine 2 may be restarted again. Further, when the engine cannot be started at this time and the remaining capacity SOC of the high voltage battery 5 is smaller than the specified SOC 4, the main contactor means 4 and the air conditioner contactor means 13 are used to prevent the discharge of the high voltage battery 5. And the discharge of the high voltage battery 5 may be completely stopped.
[0043]
Further, the device for storing electric power for driving the traveling motor 1 is not limited to the high voltage battery 5, and any device can be used as long as it is a power storage device (energy storage device) including a capacitor or the like that can store DC power. May be. Similarly, a device for supplying low-voltage DC power to the low-voltage driven auxiliary machines 12 or the like is not limited to the low-voltage battery 10, and a power storage device (energy storage device) including a capacitor or the like that can store DC power. Anything can be used.
[0044]
As described above, according to the hybrid vehicle of the present embodiment, when the current control is in the idling stop, the ECU 11 causes the electric compressor 16 to change when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the specified SOC1. The output is limited, and the electric power consumed by the electric compressor 16 is reduced. Further, when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the prescribed SOC2, the ECU 11 executes output restriction of the DC / DC converter 9 that lowers the output voltage, and outputs of the DC / DC converter 9 and the DC / DC converter 9 The power consumed by the auxiliary machines 12 and the like connected to is reduced.
[0045]
Further, when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the prescribed SOC3, the ECU 11 restarts the engine 2 and stops the operation of the electric compressor 16 and the DC / DC converter 9 if the engine 2 cannot be restarted. Then, the power consumption of the high voltage battery 5 by the electric compressor 16, the DC / DC converter 9, and the auxiliary machines 12 connected to the output of the DC / DC converter 9 is stopped, and then the engine 2 is restarted. At this time, if the engine cannot be started and the remaining capacity SOC of the high voltage battery 5 becomes smaller than the specified SOC 4, the ECU 11 connects the main contactor means 4 and the air conditioner contactor means 13 to prevent the high voltage battery 5 from discharging. It cut | disconnects and discharge of the high voltage battery 5 is stopped completely.
[0046]
Therefore, before restarting the engine 2, the electric power of the high voltage battery 5 by the electric compressor 16, the DC / DC converter 9 and the auxiliary machines 12 is limited by the output limitation of the electric compressor 16 and the output limitation of the DC / DC converter 9. By reducing the consumption and extending the time until the engine 2 is restarted, it is possible to reduce the engine start while the vehicle is stopped and to improve the fuel efficiency of the vehicle.
[0047]
If the remaining capacity SOC of the high voltage battery 5 is smaller than the specified SOC 3 and the engine 2 should be restarted, but the engine 2 cannot be restarted, the operation of the electric compressor 16 and the DC / DC converter 9 is performed. By stopping completely, the engine 2 can be reliably restarted by the electric power remaining in the high voltage battery 5, and the effect that the reliability can be improved is obtained. Further, in a case where the engine 2 cannot be restarted, when the remaining capacity SOC of the high voltage battery 5 becomes smaller than the specified SOC 4, the ECU 11 disconnects the main contactor means 4 and the air conditioner contactor means 13 to By completely stopping the discharge, it is possible to prevent the high voltage battery 5 from being deteriorated due to overdischarge.
[0048]
Specifically, the state change of the high voltage battery 5 by the battery overdischarge protection operation of the present embodiment will be described with reference to the drawings. FIG. 3 is a diagram showing the state change of the high voltage battery 5 by the battery overdischarge protection operation of the present embodiment with the horizontal axis representing time and the vertical axis representing the state of the high voltage battery 5.
As shown in FIG. 3, when the idle stop function operates and the engine 2 stops at time t1, the remaining capacity SOC of the high-voltage battery 5 begins to decrease gradually, and decreases from the specified SOC1 at time t2. Therefore, the ECU 11 first executes output restriction of the electric compressor 16 to reduce the electric power consumed by the electric compressor 16.
[0049]
Further, when the remaining capacity SOC of the high-voltage battery 5 further decreases and falls below the specified SOC 2 at time t3, the ECU 11 next executes output limitation of the DC / DC converter 9, and the DC / DC converter 9 and the DC / DC The electric power consumed by the auxiliary machines 12 connected to the output of the DC converter 9 is reduced. Therefore, until the time t4 when the remaining capacity SOC of the high-voltage battery 5 further decreases and falls below the specified SOC3, it becomes possible to continue the idle stop without restarting the engine 2, and start the engine while the vehicle is stopped. As a result, the fuel efficiency of the vehicle can be improved.
[0050]
Further, when the remaining capacity SOC of the high-voltage battery 5 further decreases and falls below the specified SOC 3 at time t4, the ECU 11 restarts the engine 2 next. If the engine 2 cannot be restarted here, the operation of the electric compressor 16 and the DC / DC converter 9 is stopped in this order, and the engine 2 is restarted again. Therefore, the engine 2 can be reliably restarted by the electric power remaining in the high-voltage battery 5, and the effect that the reliability can be improved is obtained.
[0051]
Furthermore, when the engine 2 cannot be started and the remaining capacity SOC of the high voltage battery 5 falls below the specified SOC 4 as shown by the dotted line at time t5, the ECU 11 prevents the high voltage battery 5 from discharging. By disconnecting the main contactor means 4 and the air conditioner contactor means 13 and completely stopping the discharge of the high voltage battery 5, it is possible to prevent the deterioration of the high voltage battery 5 due to overdischarge.
[0052]
【The invention's effect】
As described above, according to the hybrid vehicle of the present invention, power is charged / discharged as the driving motor is driven or regenerated, and the amount of power stored in the power storage device that supplies power to the electric motor of the vehicle air conditioner is controlled by air conditioning. When it falls below the threshold, the power consumption of the power storage device by the electric motor is reduced. Further, when the power storage amount of the power storage device falls below the converter control threshold value that is smaller than the air conditioning control threshold value, the power consumption of the power storage device by the electric motor and the voltage converter is reduced. Further, when the amount of power stored in the power storage device falls below the converter stop threshold value which is smaller than the converter control threshold value, the engine is restarted, and the electric power generated by the traveling motor using the power of the engine is supplied to the electric motor. , Supplied to the voltage converter and the power storage device.
[0053]
In addition, if the amount of power stored in the power storage device is small and the engine cannot be restarted by driving the travel motor first, stop the operation of the electric motor and voltage converter of the vehicle air conditioner, All of the stored electric power remaining in the power storage device is used to restart the engine. Even if the power consumption of the power storage device by the electric motor and the voltage converter is reduced, the power consumption of the power storage device is not stopped due to, for example, a failure of the voltage converter, and the power storage amount of the power storage device is further stopped. When the switching device disconnection threshold value is smaller than the threshold value, the storage device is overdischarged by disconnecting the switching device that interrupts the power supply between the power storage device and the parallel circuit of the running motor and voltage converter. To prevent.
[0054]
Therefore, before restarting the engine, the power consumption of the power storage device is reduced by the output limit of the electric motor and the output limit of the voltage converter, and the time until the engine is restarted is increased. It is possible to reduce the engine start and to improve the fuel efficiency of the vehicle. In addition, when the amount of power stored in the power storage device decreases and the engine should not be restarted even though the engine should be restarted, the operation of the electric motor or voltage converter is completely stopped to remain in the power storage device The engine can be restarted reliably by electric power, and the effect that the reliability can be improved is obtained. Furthermore, when the engine cannot be restarted, when the amount of power stored in the power storage device decreases, the discharge of the power storage device is completely stopped, thereby preventing the deterioration of the high voltage battery 5 due to overdischarge. can get.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a hybrid vehicle according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a battery overdischarge protection operation by the control unit of the hybrid vehicle of the embodiment;
FIG. 3 is a diagram showing a state change of a high voltage battery by a battery overdischarge protection operation in the control unit of the hybrid vehicle of the embodiment.
[Explanation of symbols]
1 traveling motor 2 engine 4 main contactor means 4 (opening / closing means)
5 High voltage battery (power storage device)
9 DC / DC converter (voltage converter)
11 ECU (control unit)
13 Air-conditioning contactor means (open / close means)
14 Vehicle air conditioner 16 Electric compressor (electric motor)

Claims (8)

  1. A hybrid vehicle that travels with the power of at least one of an engine or a traveling motor and that can automatically stop and restart the engine under predetermined conditions,
    A power storage device that charges and discharges electric power when the driving motor is driven or regenerated, and
    A voltage converter that converts electric power of the power storage device into electric power having a lower potential than the electric power;
    A controller that controls charging and discharging of the power storage device,
    The hybrid is characterized in that the control unit limits the output of the voltage converter when a storage amount of the power storage device falls below a converter control threshold while the engine is stopped under a predetermined condition. vehicle.
  2. The controller restarts the engine when the amount of power stored in the power storage device falls below a converter stop threshold smaller than the converter control threshold while the engine is stopped under a predetermined condition. The hybrid vehicle according to claim 1.
  3. The hybrid vehicle according to claim 2, wherein the control unit stops the operation of the voltage converter and restarts the engine again.
  4. A hybrid vehicle that travels with the power of at least one of an engine or a traveling motor and that can automatically stop and restart the engine under predetermined conditions,
    A vehicle air conditioner that can be driven by an electric motor;
    A power storage device that charges and discharges electric power with driving or regeneration of the traveling motor and supplies electric power to the electric motor;
    A voltage converter that converts electric power of the power storage device into electric power having a lower potential than the electric power;
    A controller that controls charging and discharging of the power storage device,
    When the amount of power stored in the power storage device falls below an air conditioning control threshold value while the engine is stopped under a predetermined condition, the control unit limits the output of the vehicle air conditioning device if it is operating. A hybrid vehicle characterized by that.
  5. When the control unit further stops the engine under a predetermined condition, and the amount of power stored in the power storage device falls below a converter control threshold value smaller than the air conditioning control threshold value, the output of the voltage converter The hybrid vehicle according to claim 4, wherein the hybrid vehicle is limited.
  6. The controller restarts the engine when the amount of power stored in the power storage device falls below a converter stop threshold smaller than the converter control threshold while the engine is stopped under a predetermined condition. The hybrid vehicle according to claim 5.
  7. The hybrid vehicle according to claim 6, wherein the control unit stops operation in the order of the electric motor and the voltage converter and restarts the engine again.
  8. In addition to being provided in series with the input / output terminal of the power storage device, comprising an opening / closing means for intermittently inputting and outputting power to the power storage device,
    The control unit disconnects the opening / closing means when the amount of power stored in the power storage device falls below an opening / closing means disconnection threshold value smaller than the converter stop threshold value while the engine is stopped under a predetermined condition. The hybrid vehicle according to claim 3, wherein the hybrid vehicle is a vehicle.
JP2003201107A 2003-07-24 2003-07-24 Hybrid vehicle Withdrawn JP2005045883A (en)

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WO2006121005A1 (en) * 2005-05-13 2006-11-16 Matsushita Electric Industrial Co., Ltd. Engine starting device and automobile using the same
WO2008123368A1 (en) * 2007-03-28 2008-10-16 Komatsu Ltd. Hybrid construction machine controlling method, and hybrid construction machine
JP2010070070A (en) * 2008-09-19 2010-04-02 Mitsubishi Motors Corp Vehicle controller
JP2011160613A (en) * 2010-02-03 2011-08-18 Hino Motors Ltd Battery control apparatus and hybrid vehicle
JP2012205495A (en) * 2011-03-23 2012-10-22 General Electric Co <Ge> System for supplying propulsion energy from auxiliary driving part and production method thereof
WO2013018221A1 (en) * 2011-08-04 2013-02-07 トヨタ自動車株式会社 Vehicle, and vehicle control method
CN103339006A (en) * 2011-01-31 2013-10-02 铃木株式会社 Hybrid vehicle
JP2015074331A (en) * 2013-10-09 2015-04-20 トヨタ自動車株式会社 Hybrid vehicle
WO2016098327A1 (en) * 2014-12-19 2016-06-23 株式会社デンソー Hybrid vehicle control device
EP3138725A1 (en) * 2015-07-30 2017-03-08 Hamilton Sundstrand Corporation Dual-source multi-mode vehicle power supply
WO2017090630A1 (en) * 2015-11-24 2017-06-01 いすゞ自動車株式会社 Hybrid vehicle and control method therefor
US9889841B2 (en) 2013-12-16 2018-02-13 Byd Company Limited Method and system for starting engine of hybrid vehicle
EP2557007A4 (en) * 2010-04-07 2018-05-02 Toyota Jidosha Kabushiki Kaisha Hybrid-vehicle control device and hybrid vehicle provided therewith
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WO2006121005A1 (en) * 2005-05-13 2006-11-16 Matsushita Electric Industrial Co., Ltd. Engine starting device and automobile using the same
WO2008123368A1 (en) * 2007-03-28 2008-10-16 Komatsu Ltd. Hybrid construction machine controlling method, and hybrid construction machine
DE112008000818T5 (en) 2007-03-28 2010-01-14 Komatsu Ltd. Method for controlling a hybrid construction machine and hybrid construction machine
US8439139B2 (en) 2007-03-28 2013-05-14 Komatsu Ltd. Method of controlling hybrid construction machine and hybrid construction machine
KR101120452B1 (en) 2007-03-28 2012-03-02 가부시키가이샤 고마쓰 세이사쿠쇼 Hybrid construction machine controlling method, and hybrid construction machine
JP4892057B2 (en) * 2007-03-28 2012-03-07 株式会社小松製作所 Control method of hybrid construction machine and hybrid construction machine
DE112008000818B4 (en) * 2007-03-28 2017-12-14 Komatsu Ltd. Method for controlling a hybrid construction machine and hybrid construction machine
JP2010070070A (en) * 2008-09-19 2010-04-02 Mitsubishi Motors Corp Vehicle controller
JP2011160613A (en) * 2010-02-03 2011-08-18 Hino Motors Ltd Battery control apparatus and hybrid vehicle
EP2557007A4 (en) * 2010-04-07 2018-05-02 Toyota Jidosha Kabushiki Kaisha Hybrid-vehicle control device and hybrid vehicle provided therewith
CN103339006A (en) * 2011-01-31 2013-10-02 铃木株式会社 Hybrid vehicle
DE112011104804T5 (en) 2011-01-31 2013-10-31 Suzuki Motor Corporation hybrid vehicle
CN103339006B (en) * 2011-01-31 2015-12-16 铃木株式会社 Motor vehicle driven by mixed power
JP2012205495A (en) * 2011-03-23 2012-10-22 General Electric Co <Ge> System for supplying propulsion energy from auxiliary driving part and production method thereof
WO2013018221A1 (en) * 2011-08-04 2013-02-07 トヨタ自動車株式会社 Vehicle, and vehicle control method
JP2015074331A (en) * 2013-10-09 2015-04-20 トヨタ自動車株式会社 Hybrid vehicle
US10059172B2 (en) 2013-12-16 2018-08-28 Byd Company Limited Air conditioning system, method for controlling the same and hybrid vehicle
US9889841B2 (en) 2013-12-16 2018-02-13 Byd Company Limited Method and system for starting engine of hybrid vehicle
JP2016117389A (en) * 2014-12-19 2016-06-30 株式会社デンソー Hybrid vehicle control device
WO2016098327A1 (en) * 2014-12-19 2016-06-23 株式会社デンソー Hybrid vehicle control device
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US9819224B2 (en) 2015-07-30 2017-11-14 Hamilton Sundstrand Corporation Dual-source multi-mode vehicle power supply
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KR101915673B1 (en) * 2018-05-09 2018-11-06 써멀마스터 주식회사 Refrigeration system for refrigerators

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