CN113879124A - Power-off control method, system, vehicle and storage medium - Google Patents

Power-off control method, system, vehicle and storage medium Download PDF

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Publication number
CN113879124A
CN113879124A CN202111003297.3A CN202111003297A CN113879124A CN 113879124 A CN113879124 A CN 113879124A CN 202111003297 A CN202111003297 A CN 202111003297A CN 113879124 A CN113879124 A CN 113879124A
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China
Prior art keywords
power
shutdown
program
vehicle
unit controller
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CN202111003297.3A
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CN113879124B (en
Inventor
李群
涂连军
聂奇松
黄伟强
李颖
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • 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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The invention provides a power-off control method, a power-off control system, a vehicle and a storage medium. The method comprises the following steps: receiving a power-off signal of a vehicle key; when a power-off signal of a vehicle key is received, executing a preset shutdown program, wherein the used time of the preset shutdown program is less than the delayed time of delayed power failure of the vehicle controller, and the preset shutdown program comprises the following steps: the device shutdown method comprises a first preset shutdown program and a second preset shutdown program, wherein the number of devices contained in the first preset shutdown program and shutdown according to a correct shutdown program is less than that of the second preset shutdown program, and at least one device contained in the first preset shutdown program and shutdown according to the correct shutdown program is provided. The control method and the control device ensure that the refrigerating unit controller can at least control individual important equipment to execute a correct shutdown program, ensure that the equipment is prevented from being damaged by sudden shutdown, and prolong the service life of the equipment.

Description

Power-off control method, system, vehicle and storage medium
Technical Field
The invention relates to the technical field of vehicle electronics, in particular to a power failure control method, a power failure control system, a vehicle and a storage medium.
Background
With the development of energy storage battery technology and the vigorous support of national policies, new energy vehicles are gradually popularized. In the cold chain transportation industry, new energy refrigerated vehicles occupy an important position. After a person uses a car to stop the car, the person usually stops the car immediately by directly turning off a car key. The whole new energy refrigerator car and the matched refrigerating unit are all powered by the high-voltage battery, and many drivers are used to cut off the high-voltage power supply of the car by directly turning off a car key, so that the aims of shutting down the refrigerating unit and cutting off the power of the whole car are fulfilled, and the purposes of shutting down the whole car and cutting off the power of the refrigerating unit are not realized after first shutting down the car. The operation mode enables the refrigeration unit to be in an on-load power failure state, and can cause serious arc-discharge adhesion phenomena to the switch device of the high-voltage power supply loop of the refrigeration unit, and the high-voltage switch device can be damaged in the past. And the capacitor in the refrigerator unit controller stores a large amount of electric energy after the key is turned to be powered off directly, if the electric quantity in the capacitor is not consumed immediately, a part of loops of the controller still have the phenomenon of electrification after the power is off, and the electric shock danger is brought to unit maintenance personnel.
Disclosure of Invention
The invention mainly aims to provide a power-off control method, a power-off control system, a vehicle and a storage medium, so as to solve the problem that electrical equipment is damaged when a refrigerator car is directly powered off.
In a first aspect, the present invention provides a power-off control method applied to a refrigeration unit controller, including: receiving a power-off signal of a vehicle key; when a power-off signal of a vehicle key is received, executing a preset shutdown program, wherein the used time of the preset shutdown program is less than the delayed time of delayed power failure of the vehicle controller, and the preset shutdown program comprises the following steps: the device shutdown method comprises a first preset shutdown program and a second preset shutdown program, wherein the number of devices contained in the first preset shutdown program and shutdown according to a correct shutdown program is less than that of the second preset shutdown program, and at least one device contained in the first preset shutdown program and shutdown according to the correct shutdown program is provided.
In one embodiment, after the preset shutdown procedure is executed, the method further includes: detecting whether high voltage is input; when no high voltage is input, the discharge circuit is controlled to enter a discharge state.
In one embodiment, after controlling the discharge circuit to enter the discharge state, the method further comprises: detecting whether high voltage is input; and when the high-voltage input is detected, controlling the discharge circuit to stop discharging.
In one embodiment, after the preset shutdown procedure is executed, the method further includes: and sending a shutdown completion signal to the vehicle controller so that the vehicle controller shuts off a high-voltage power supply loop of the refrigerating unit controller.
In a second aspect, the present invention provides a power outage control method applied to a vehicle controller, including: receiving a power-off signal of a vehicle key; and when a power-off signal of the car key is received, delaying power-off of the refrigerating unit controller, wherein the delaying time length of the delaying power-off is longer than the time length required by the refrigerating unit controller to execute a preset shutdown program, so that a high-voltage power supply loop of the refrigerating unit controller is turned off after the refrigerating unit controller executes the preset shutdown program.
In one embodiment, the delayed power down comprises: receiving a shutdown completion signal sent by a refrigerating unit controller; and when a shutdown completion signal sent by the refrigerating unit controller is received, the high-voltage power supply loop of the refrigerating unit controller is shut down.
In a third aspect, the present invention provides a refrigeration unit controller comprising a processor and a memory, said memory having stored therein a computer program which, when executed by said processor, implements the steps of the power down control method as described above.
In a fourth aspect, the present invention provides a vehicle control unit, including: the communication device is used for receiving a lower electric signal of the vehicle key; a controller comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, carries out the steps of the power down control method as described above.
In one embodiment, further comprising: the time-delay power-off device is used for carrying out time-delay power-off on the refrigerating unit controller and comprises a time-delay power-off circuit and/or a time-delay relay; the controller is also used for controlling the time-delay power-off device to carry out time-delay power-off on the refrigerating unit controller when the communication device receives a power-off signal of a car key.
In a fifth aspect, the present invention provides a power outage control system comprising a refrigeration unit controller as described above and a vehicle control unit as described above.
In a sixth aspect, the invention provides a vehicle comprising a power outage control system as described above.
In a seventh aspect, the present invention provides a storage medium having stored therein a computer program which, when executed by a processor, implements the steps of the power down control method as described above or the steps of the power down control method as described above.
By adopting the power-off control method, when the refrigerating unit controller receives the power-off signal of the car key, the preset power-off program is executed, meanwhile, when the whole car controller receives the power-off signal of the car key, the refrigerating unit controller is powered off in a delayed way, and the delay time of the delayed power-off is longer than the time required by the refrigerating unit controller to execute the preset power-off program, so that the refrigerating unit controller is ensured to be capable of controlling at least individual important equipment to execute the correct power-off program, the equipment is prevented from being damaged by sudden power-off, and the service life of the equipment is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention
In the figure:
FIG. 1 is a flow chart of a power down control method according to an exemplary embodiment of the present application;
FIG. 2 is a flow chart of a power down control method according to an exemplary embodiment of the present application;
FIG. 3 is a flow chart of a power down control method according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a power outage control system according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The present embodiment provides a power outage control method applied to a refrigeration unit controller, and fig. 1 is a flowchart of a power outage control method according to an exemplary embodiment of the present application. As shown in fig. 1, the method of this embodiment may include:
s100: and receiving a power-off signal of the vehicle key.
S300: when a power-off signal of a vehicle key is received, executing a preset shutdown program, wherein the used time of the preset shutdown program is less than the delayed time of delayed power failure of the vehicle controller, and the preset shutdown program comprises the following steps: the device shutdown method comprises a first preset shutdown program and a second preset shutdown program, wherein the number of devices contained in the first preset shutdown program and shutdown according to a correct shutdown program is less than that of the second preset shutdown program, and at least one device contained in the first preset shutdown program and shutdown according to the correct shutdown program is provided.
For example, the second preset shutdown program may be a normal shutdown program of the refrigeration unit controller, and may control all five devices to be sequentially shutdown according to a correct shutdown program of the devices, and correspondingly, the first preset shutdown program may be a simplified shutdown program of the refrigeration unit controller, and may control two important devices of all five devices to be shutdown according to the correct shutdown program of the devices. The correct shutdown program is an execution program for correctly shutting down the device when the device is operated, and can be obtained from the device specification in most cases.
Of course, the preset shutdown program may be configured as needed, and may not only be limited to the first preset shutdown program and the second preset shutdown program, but also include preset shutdown programs with more configurations.
By executing the preset shutdown program, at least partial important equipment of the refrigerating unit can be shut down according to the correct shutdown program, and damage to the partial important equipment due to sudden power failure is reduced.
After the preset shutdown procedure is executed, the method may further include: detecting whether high voltage is input; when no high voltage is input, the discharge circuit is controlled to enter a discharge state. When no high voltage is input, the refrigerating unit is completely powered off, and the discharge circuit is started safely. And, through discharging, has released the electric charge in the capacitor of the controller kind of the refrigerating unit, thus has guaranteed the security when the maintenance personal maintains the apparatus.
After controlling the discharge circuit to enter the discharge state, the method may further include: detecting whether high voltage is input; and when the high-voltage input is detected, controlling the discharge circuit to stop discharging. When a high-voltage input is detected in the discharging process, the discharging circuit is immediately controlled to stop discharging so as not to damage the refrigerating unit controller.
In another example, after the preset shutdown procedure is executed, the method may further include: and sending a shutdown completion signal to the vehicle controller so that the vehicle controller shuts off a high-voltage power supply loop of the refrigerating unit controller. The shutdown completion signal is sent to the vehicle controller, so that the vehicle controller timely shuts off a high-voltage power supply loop of the refrigerating unit controller when receiving the shutdown completion signal.
Example two
The present embodiment provides a power outage control method applied to a vehicle control unit, and fig. 2 is a flowchart of the power outage control method according to an exemplary embodiment of the present application. As shown in fig. 2, the method of this embodiment may include:
s200: and receiving a power-off signal of the vehicle key.
S400: and when a power-off signal of the car key is received, delaying power-off of the refrigerating unit controller, wherein the delaying time length of the delaying power-off is longer than the time length required by the refrigerating unit controller to execute a preset shutdown program, so that a high-voltage power supply loop of the refrigerating unit controller is turned off after the refrigerating unit controller executes the preset shutdown program.
In one example, the delayed power down may be implemented by a delayed power down circuit or a delayed relay.
In another example, the delayed power down may include: receiving a shutdown completion signal sent by a refrigerating unit controller; and when a shutdown completion signal sent by the refrigerating unit controller is received, the high-voltage power supply loop of the refrigerating unit controller is shut down.
By adopting the power-off control method, when the refrigerating unit controller receives the power-off signal of the car key, the preset power-off program is executed, meanwhile, when the whole car controller receives the power-off signal of the car key, the refrigerating unit controller is powered off in a delayed way, and the delay time of the delayed power-off is longer than the time required by the refrigerating unit controller to execute the preset power-off program, so that the refrigerating unit controller is ensured to be capable of controlling at least individual important equipment to execute the correct power-off program, the equipment is prevented from being damaged by sudden power-off, and the service life of the equipment is prolonged.
EXAMPLE III
The present embodiment provides a refrigeration unit controller comprising a processor and a memory, said memory having stored therein a computer program which, when executed by said processor, implements the steps of the power down control method as described above.
Example four
The embodiment provides a vehicle control unit, includes: the communication device is used for receiving a lower electric signal of the vehicle key; a controller comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, carries out the steps of the power down control method as described above.
The vehicle control unit of the embodiment may further include: the time-delay power-off device is used for carrying out time-delay power-off on the refrigerating unit controller and comprises a time-delay power-off circuit and/or a time-delay relay; the controller is also used for controlling the time-delay power-off device to carry out time-delay power-off on the refrigerating unit controller when the communication device receives a power-off signal of a car key.
EXAMPLE five
The present embodiment provides a power outage control system comprising a refrigeration unit controller as described above and a vehicle control unit as described above.
EXAMPLE six
The present embodiment provides a vehicle including the power outage control system as described above.
EXAMPLE seven
The present embodiment provides a storage medium having stored therein a computer program which, when executed by a processor, implements the steps of the power outage control method as described above or the steps of the power outage control method as described above.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method or computer program product. Accordingly, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations of methods and computer program products according to embodiments of the invention. It will be understood that each flow of the flowcharts, and combinations of flows in the flowcharts, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows.
Storage media, including permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
Example eight
An embodiment of a power outage control method provided in this embodiment may be applied to a refrigerator car, fig. 3 is a flowchart of the power outage control method according to an embodiment of the present application, and fig. 4 is a schematic structural diagram of a power outage control system according to an embodiment of the present application.
The power failure control method of the embodiment can improve the reliability of the vehicle and the safety of maintenance operation.
As shown in fig. 3, when the driver turns the car key to the OFF-range while parking, the refrigeration unit controller and the vehicle controller simultaneously receive the car key power-OFF signal. The refrigeration unit immediately executes a preset shutdown procedure, which may be an emergency shutdown operation, for example, to stop the operation of the compressor and other loads. Meanwhile, the vehicle control unit receives the vehicle key power-off signal and then controls the power supply loop of the refrigerating unit to start a delayed power-off program, and after the delay time is up, the vehicle control unit sends a power-off signal and controls the contact of a high-voltage switching device of a high-voltage power supply loop of the refrigerating unit to be disconnected. The power-off delay time of the whole vehicle controller is a preset value, and the preset delay time is more than or equal to the shutdown time of the refrigerating unit executing a preset shutdown program.
In one example, when the vehicle control unit is not provided with the delay power-off circuit of the power supply circuit of the refrigeration unit, a delay relay can be arranged to realize delay power-off. The vehicle controller receives a vehicle key power-off signal and directly sends a power-off instruction to the high-voltage switch device, wherein the high-voltage switch device is a power-off delay relay, and the high-voltage delay relay needs to meet the condition that the delay time is longer than or equal to the time required by shutdown of the refrigerating unit in the aspect of model selection.
In another example, when the vehicle controller is not provided with the delay power-off circuit or the delay relay, a communication connection may be established between the refrigeration unit controller and the vehicle controller, the vehicle controller sends a shutdown completion signal to the vehicle controller after shutdown of the refrigeration unit controller is completed, and the vehicle controller disconnects the power supply circuit to the refrigeration unit after receiving the shutdown completion signal. As shown in fig. 4, since the refrigeration unit controller has a constant-current end connected to the low-voltage battery of the vehicle, the refrigeration unit controller may send a shutdown completion signal to the vehicle controller after the shutdown of the refrigeration unit is completed. And the vehicle control unit immediately executes the power-off operation of the power supply circuit. When the high-voltage power supply circuit of the refrigerating unit is powered off, the low-voltage power supply input of the refrigerating unit controller still exists, and the refrigerating unit controller is in a standby state. And when the refrigerating unit controller detects that no high-voltage power supply is input, the discharging circuit is connected immediately, and the electric energy stored in the capacitor of the refrigerating unit controller is consumed through the discharging circuit. The main device of the discharge circuit can be a resistor or a cement resistor with a heat dissipation block, and the resistor is connected in series with a controllable switch and connected in parallel with two ends of a capacitor. In addition, when the discharge circuit works, if the car key starts the car, the high voltage of the unit is electrified again, and the refrigeration unit controller immediately controls the discharge circuit to be disconnected, so that unnecessary power consumption is reduced, and the resistance of the discharge circuit is prevented from being overheated.
By adopting the power-off control method of the embodiment, the problems that the direct power-off of the vehicle can damage electrical equipment and cause safety accidents are solved.
Due to the adoption of the power-off control method of the new energy refrigerator car, the car can orderly execute power-off operation, the loss of electrical equipment in the car is effectively reduced, the service life of the electrical equipment is prolonged, and the maintenance safety of the electrical equipment after power-off is improved.
It is noted that the terms used herein are merely for describing particular embodiments and are not intended to limit exemplary embodiments according to the present application, and when the terms "include" and/or "comprise" are used in this specification, they specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
It should be understood that the exemplary embodiments herein may be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, and should not be construed as limiting the present invention.

Claims (12)

1. A power-off control method is applied to a refrigerating unit controller and comprises the following steps:
receiving a power-off signal of a vehicle key;
when a power-off signal of a vehicle key is received, executing a preset shutdown program, wherein the used time of the preset shutdown program is less than the delayed time of delayed power failure of the vehicle controller, and the preset shutdown program comprises the following steps: the device shutdown method comprises a first preset shutdown program and a second preset shutdown program, wherein the number of devices contained in the first preset shutdown program and shutdown according to a correct shutdown program is less than that of the second preset shutdown program, and at least one device contained in the first preset shutdown program and shutdown according to the correct shutdown program is provided.
2. The power-off control method according to claim 1, wherein after the preset shutdown procedure is performed, the method further comprises:
detecting whether high voltage is input;
when no high voltage is input, the discharge circuit is controlled to enter a discharge state.
3. The power-down control method of claim 2, wherein after controlling the discharge circuit to enter the discharge state, the method further comprises:
detecting whether high voltage is input;
and when the high-voltage input is detected, controlling the discharge circuit to stop discharging.
4. The power-off control method according to claim 1, wherein after the preset shutdown procedure is performed, the method further comprises:
and sending a shutdown completion signal to the vehicle controller so that the vehicle controller shuts off a high-voltage power supply loop of the refrigerating unit controller.
5. A power failure control method is applied to a vehicle control unit and comprises the following steps:
receiving a power-off signal of a vehicle key;
and when a power-off signal of the car key is received, delaying power-off of the refrigerating unit controller, wherein the delaying time length of the delaying power-off is longer than the time length required by the refrigerating unit controller to execute a preset shutdown program, so that a high-voltage power supply loop of the refrigerating unit controller is turned off after the refrigerating unit controller executes the preset shutdown program.
6. The power-off control method according to claim 5, wherein the delayed power-off comprises:
receiving a shutdown completion signal sent by a refrigerating unit controller;
and when a shutdown completion signal sent by the refrigerating unit controller is received, the high-voltage power supply loop of the refrigerating unit controller is shut down.
7. A refrigeration unit controller, characterized by comprising a processor and a memory, in which a computer program is stored which, when being executed by the processor, carries out the steps of the power down control method according to any one of claims 1 to 4.
8. A vehicle control unit, comprising:
the communication device is used for receiving a lower electric signal of the vehicle key;
controller comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, carries out the steps of the power down control method according to claim 5 or 6.
9. The vehicle control unit of claim 8, further comprising:
the time-delay power-off device is used for carrying out time-delay power-off on the refrigerating unit controller and comprises a time-delay power-off circuit and/or a time-delay relay;
the controller is also used for controlling the time-delay power-off device to carry out time-delay power-off on the refrigerating unit controller when the communication device receives a power-off signal of a car key.
10. A power outage control system comprising a refrigeration unit controller according to claim 7 and a vehicle control unit according to claim 8 or 9.
11. A vehicle characterized by comprising the power outage control system of claim 10.
12. A storage medium having a computer program stored therein, wherein the computer program, when executed by a processor, implements the steps of the power outage control method according to any one of claims 1-4 or the steps of the power outage control method according to any one of claims 5-7.
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CN112865771A (en) * 2020-12-31 2021-05-28 广州极飞科技股份有限公司 Delayed power-off system, unmanned equipment and delayed power-off method
CN113022313A (en) * 2021-04-07 2021-06-25 广西柳工机械股份有限公司 VCU power-off protection circuit, power-off control method, system and engineering machinery

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