CN111216556A - Low-voltage power storage unit charging control method and system and unmanned vehicle - Google Patents
Low-voltage power storage unit charging control method and system and unmanned vehicle Download PDFInfo
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- CN111216556A CN111216556A CN202010104667.1A CN202010104667A CN111216556A CN 111216556 A CN111216556 A CN 111216556A CN 202010104667 A CN202010104667 A CN 202010104667A CN 111216556 A CN111216556 A CN 111216556A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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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)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of power supply and power off of an unmanned vehicle, and discloses a low-voltage power storage unit charging control method, a low-voltage power storage unit charging control system and the unmanned vehicle, wherein the control method comprises the following steps: arranging a low-pressure branch and a high-pressure branch which are separated from each other; the low-voltage branch circuit comprises a DCDC converter and a low-voltage power storage unit; arranging a first-stage relay device, and electrically connecting one side of the first-stage relay device with the high-voltage power supply unit and electrically connecting the other side of the first-stage relay device with the low-voltage branch and the high-voltage branch; when the vehicle is in a power-off state, if the voltage of the low-voltage power storage unit is detected to be smaller than a first voltage preset value, the first-stage relay device is controlled to be closed, and the DCDC converter is controlled to convert the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit; and stopping charging the low-voltage electric storage unit when the voltage of the low-voltage electric storage unit is detected to be greater than the third voltage preset value. The invention solves the problem that the power of the storage battery is too fast to be normally electrified due to large quiescent current of the whole vehicle when the whole vehicle is powered off.
Description
Technical Field
The invention relates to the technical field of power supply and power off of an unmanned vehicle, in particular to a low-voltage power storage unit charging control method and system and the unmanned vehicle.
Background
With the increasing exhaustion of global petroleum resources and the increasing severity of global environmental pollution, new energy electric vehicles are the future of traditional fuel vehicles as effective measures for relieving energy pressure and reducing environmental pollution, and are more and more concerned due to the advantages of energy conservation, environmental protection, low noise and the like.
At present, the unmanned vehicle also adopts a new energy electric vehicle, more and more electric control units and electronic components are applied to the unmanned vehicle and need to be directly connected with a low-voltage storage battery due to the intellectualization and networking of the unmanned vehicle, and when the whole vehicle is powered off, part of the electric control units and the electronic components are in a working state, so that the quiescent current of the unmanned vehicle is large, and the electric quantity of the low-voltage storage battery is consumed too fast, so that the unmanned vehicle cannot be powered on normally. For example, some controllers such as a parking controller and an active anti-collision controller have high requirements on 12V power supply voltage, and when the voltage of a low-voltage storage battery is lower than 9V, a fault that the voltage of the controller is too low can be reported, and the controller cannot work normally.
In the prior art, when the voltage of a low-voltage storage battery is too low, the normal high voltage of the whole vehicle is realized by adopting a temporary charging or electrifying method, and when the normal high voltage of the whole vehicle is electrified, a DCDC device is started to charge the storage battery. The prior art also has the following defects: temporary charging is adopted, so that the operation is troublesome and time-consuming; by adopting the electrification method, the short circuit of the storage battery is easily caused, and danger is generated.
Disclosure of Invention
To solve the above technical problem, a first aspect of the present invention provides a method for controlling charging of a low-voltage power storage unit, the method comprising:
arranging a low-pressure branch and a high-pressure branch which are separated from each other;
the low-voltage branch circuit comprises a DCDC converter and a low-voltage power storage unit;
arranging a first-stage relay device, wherein one side of the first-stage relay device is electrically connected with a high-voltage power supply unit, and the other side of the first-stage relay device is electrically connected with the low-voltage branch and the high-voltage branch;
detecting whether the voltage of the low-voltage power storage unit is smaller than a first voltage preset value or not when the vehicle is in a power-off state;
if yes, controlling the first-stage relay device to be closed, and converting high voltage of the high-voltage power supply unit into low voltage through a DCDC converter so as to charge a low-voltage power storage unit of the low-voltage branch circuit;
and when the voltage of the low-voltage electric storage unit is detected to be larger than a third voltage preset value, stopping charging the low-voltage electric storage unit.
According to the invention, the low-voltage branch and the high-voltage branch which are separated from each other are arranged, so that on one hand, when the vehicle is in a power-off state and the voltage of the low-voltage electric storage unit is lower than a first voltage preset value, the low-voltage electric storage unit can be charged through the DCDC converter, the operation is simple and convenient, and the low-voltage electric storage unit is prevented from being damaged due to over-discharge of the voltage of the low-voltage electric storage unit; the problem that the timely electrification of the vehicle is influenced and the work of the vehicle is influenced due to insufficient voltage of the low-voltage power storage unit when the vehicle is electrified next time can be prevented; on the other hand, the low-voltage branch circuit is separated from the high-voltage branch circuit, so that the safety is improved; in addition, when the voltage of the low-voltage power storage unit is detected to be larger than the third preset value, the charging is stopped, the overcharge is prevented, and the service life of the low-voltage power storage unit is prolonged.
Further, the method comprises: when the vehicle is in a power-on state, detecting whether the voltage of the low-voltage power storage unit is smaller than a second voltage preset value; if yes, the first-stage relay device is controlled to be closed, and the high-voltage electricity of the high-voltage power supply unit is converted into low-voltage electricity through the DCDC converter so as to charge the low-voltage electricity storage unit.
According to the invention, when the vehicle is in a power-on state, the voltage of the low-voltage power storage unit is detected firstly, and if the voltage of the low-voltage power storage unit is smaller than the second voltage preset value, the low-voltage power storage unit can be charged through the DCDC converter, so that the power consumption requirement of the low-voltage power demand component is ensured, the normal starting of the vehicle is ensured, and the safety is further improved.
Further, the high voltage branch comprises a high voltage demand component, and the method further comprises: and a second-stage relay device is arranged between the high-voltage power demand component and the first-stage relay device, and is controlled to be turned on when the vehicle is in a power-on state and the low-voltage power storage unit is charged.
According to the invention, the second-stage relay device is arranged, and when the low-voltage power storage unit of the low-voltage branch circuit is not charged, the second-stage relay device of the high-voltage branch circuit is turned on, so that the high-voltage circuit is independently controlled, and the safety is improved.
Further, when the voltage of the low-voltage power storage unit is detected to be greater than a third voltage preset value when the vehicle is in a power-on state and the low-voltage power storage unit is charged, the second-stage relay device is controlled to be closed so as to power on the high-voltage power demand component at a high voltage.
According to the invention, the voltage of the low-voltage power storage unit is judged to meet a certain condition, so that the high-voltage branch circuit is conducted when the low-voltage power-requiring component is powered on, and the normal starting of the vehicle is ensured.
Further, the second stage relay device includes a pre-charge relay and a main positive relay arranged in parallel, the method includes: when the voltage of the low-voltage power storage unit is detected to be larger than a third voltage preset value, the pre-charging relay is closed first to pre-charge the high-voltage power demand component, after the pre-charging is completed, the main positive relay is closed to complete the high-voltage power-on of the high-voltage power demand component, and then the pre-charging relay is disconnected.
When the high-voltage branch is electrified, the pre-charging relay is closed first, and then the main positive relay is closed, so that the instantaneous impact damage of electrification is reduced, and the stability and the safety of high-voltage electrification are ensured.
Further, the first voltage preset value is smaller than the second voltage preset value, and the second voltage preset value is smaller than the third voltage preset value.
According to the invention, the first voltage preset value is smaller than the second voltage preset value and smaller than the third voltage preset value, so that on one hand, the voltage of the low-voltage power storage unit is prevented from being over-discharged or over-charged, and the influence on the service life of the low-voltage power storage unit is avoided; on the other hand, when the vehicle is powered on, the low-voltage power storage unit can work normally on a plurality of low-voltage power demand components.
Further, the method further comprises: when the vehicle is in a power-on state, the DCDC converter is controlled to convert the high-voltage power of the high-voltage power supply unit into low-voltage power to supply power to low-voltage power-demand components.
Further, when the vehicle is in a power-on state, before controlling the first-stage relay device to be closed, the method further comprises the following steps: and detecting whether the high-voltage power supply unit has a fault.
A second aspect of the present invention provides a low-voltage power storage unit charging control system to which the control method described in any one of the above is applied, the control system including: a vehicle control unit;
when the vehicle is in a power-off state, the vehicle control unit is used for detecting the voltage of the low-voltage power storage unit;
if the voltage of the low-voltage power storage unit is smaller than the first voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
Further, when the vehicle is in a power-on state, the vehicle control unit is used for detecting the voltage of the low-voltage power storage unit;
if the voltage of the low-voltage power storage unit is smaller than the second voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
A third aspect of the invention provides an unmanned vehicle including the low-voltage power storage unit charging control system described above.
Drawings
FIG. 1 is a flowchart illustrating a control method for a vehicle in a power-off state in the low-voltage power storage unit charging control method according to the present invention;
FIG. 2 is a schematic circuit diagram of a low-voltage power storage unit charging control method according to the present invention;
FIG. 3 is a flowchart illustrating a method for controlling a vehicle to be powered on according to the method for controlling charging of a low-voltage power storage unit of the present invention;
FIG. 4 is a flowchart illustrating a method for controlling the vehicle to be in a power-on state according to the method for controlling the charging of the low-voltage power storage unit of the present invention;
FIG. 5 is a schematic flow chart showing a control method of the vehicle in a power-on state in the low-voltage power storage unit charging control method according to the invention (III);
FIG. 6 is a flowchart illustrating a control method for the vehicle in a power-on state in the low-voltage power storage unit charging control method according to the present Invention (IV);
description of reference numerals:
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures 1 to 6 are described in detail below.
Referring to fig. 1 and 2, to solve the above technical problem, a first aspect of the present invention provides a method for controlling charging of a low-voltage power storage unit, the method including:
arranging a low-pressure branch and a high-pressure branch which are separated from each other;
the low-voltage branch circuit comprises a DCDC converter and a low-voltage power storage unit;
arranging a first-stage relay device, wherein one side of the first-stage relay device is electrically connected with a high-voltage power supply unit, and the other side of the first-stage relay device is electrically connected with the low-voltage branch and the high-voltage branch;
detecting whether the voltage of the low-voltage power storage unit is smaller than a first voltage preset value or not when the vehicle is in a power-off state;
if yes, controlling the first-stage relay device to be closed, and converting high voltage of the high-voltage power supply unit into low voltage through a DCDC converter so as to charge a low-voltage power storage unit of the low-voltage branch circuit;
and when the voltage of the low-voltage electric storage unit is detected to be larger than a third voltage preset value, stopping charging the low-voltage electric storage unit.
Preferably, the high-voltage power supply unit is a power battery.
Therefore, the low-voltage branch circuit and the high-voltage branch circuit which are separated from each other are arranged, so that on one hand, when the vehicle is in a power-off state and the voltage of the low-voltage electric storage unit is lower than a first voltage preset value, the low-voltage electric storage unit can be charged through the DCDC converter, the operation is simple and convenient, and the low-voltage electric storage unit is prevented from being damaged due to over-discharge of the voltage of the low-voltage electric storage unit; the problem that the timely electrification of the vehicle is influenced and the work of the vehicle is influenced due to insufficient voltage of the low-voltage power storage unit when the vehicle is electrified next time can be prevented; on the other hand, the low-voltage branch circuit is separated from the high-voltage branch circuit, so that the safety is improved; in addition, when the voltage of the low-voltage power storage unit is detected to be larger than the third preset value, the charging is stopped, the overcharge is prevented, and the service life of the low-voltage power storage unit is prolonged.
Referring to fig. 3, the method includes: detecting whether the voltage of the low-voltage power storage unit is smaller than a second preset voltage value or not when the vehicle is in a power-on state; if yes, the first-stage relay device is controlled to be closed, and the high-voltage electricity of the high-voltage power supply unit is converted into low-voltage electricity through the DCDC converter so as to charge the low-voltage electricity storage unit of the low-voltage branch.
Due to the fact that the vehicle is parked for a period of time, the low-voltage power storage unit can lack power, and the vehicle cannot be started normally. Therefore, when the vehicle is powered on, it is necessary to ensure that the voltage of the low-voltage power storage unit meets a certain condition to ensure that the vehicle is started normally.
Therefore, when the vehicle is in a power-on state, the voltage of the low-voltage power storage unit is detected firstly, and if the voltage of the low-voltage power storage unit is smaller than the second voltage preset value, the low-voltage power storage unit can be charged through the DCDC converter, so that the power consumption requirement of the low-voltage power demand component is ensured, the normal starting of the vehicle is ensured, and the safety is further improved.
Referring to fig. 1, the high voltage branch includes a high voltage demand component, and the method further includes: and a second-stage relay device is arranged between the high-voltage power demand component and the first-stage relay device, and is controlled to be opened and disconnect the high-voltage branch when the vehicle is in a power-on state and the low-voltage power storage unit is charged.
Therefore, the second-stage relay device is arranged, when the low-voltage power storage unit of the low-voltage branch circuit is not charged, the second-stage relay device of the high-voltage branch circuit is turned on, the high-voltage circuit is controlled independently, and safety is improved.
Referring to fig. 4, when the vehicle is in a power-on state and charges the low-voltage power storage unit, and the voltage of the low-voltage power storage unit is detected to be greater than a third voltage preset value, the second-stage relay device is controlled to be closed, and the high-voltage branch is turned on to perform high-voltage power-on the high-voltage power demand component.
Therefore, the high-voltage branch circuit can be switched on only when the low-voltage electricity-requiring component is powered on by judging that the voltage of the low-voltage electricity storage unit meets a certain condition, so that the normal starting of the vehicle is ensured.
Preferably, referring to fig. 5, the second stage relay device includes a pre-charge relay and a main positive relay arranged in parallel, and the method includes: when the vehicle is in a power-on state and the low-voltage electric storage unit is charged, when the voltage of the low-voltage electric storage unit is detected to be larger than a third voltage preset value, the pre-charging relay is closed firstly, the high-voltage branch circuit is pre-charged, after the pre-charging is completed, the main positive relay is closed, the high-voltage power-on of the high-voltage power-demand component is completed, and then the pre-charging relay is disconnected.
The high-voltage power-on-demand component comprises a motor controller and a motor, the pre-charging relay is closed firstly to pre-charge the high-voltage branch, when the voltage of the motor controller reaches a preset threshold value, the main positive relay is closed to complete the high-voltage electrification of the motor controller, then the pre-charging relay is disconnected, and the motor controller controls the operation of the motor.
Therefore, when the high-voltage branch circuit is electrified, the pre-charging relay is closed firstly, and then the main positive relay is closed, so that the instantaneous impact damage of electrification is reduced, and the stability and the safety of high-voltage electrification are ensured.
Preferably, the first voltage preset value is smaller than the second voltage preset value, and the second voltage preset value is smaller than the third voltage preset value.
Preferably, the first voltage preset value is 9V, the second voltage preset value is 10V, and the third voltage preset value is 12V.
It should be noted that, when the vehicle is in a power-off state, if the voltage of the low-voltage power storage unit is smaller than a first voltage preset value, the low-voltage power storage unit is charged, so that the voltage of the low-voltage power storage unit is ensured to be within a reasonable range, the voltage of the low-voltage power storage unit is prevented from being over-discharged, the low-voltage power storage unit is prevented from being damaged, and the first voltage preset value cannot be too high, otherwise, the low-voltage power storage unit is frequently charged; and when the voltage of the low-voltage power storage unit is greater than a third preset value, stopping charging the low-voltage power storage unit, and preventing the low-voltage power storage unit from being overcharged to influence the service life of the low-voltage power storage unit.
When the vehicle is in a power-on state, if the voltage of the low-voltage power storage unit is smaller than a second voltage preset value, the low-voltage power storage unit is charged, and the second voltage preset value is set to be larger than the first voltage preset value because the power consumption requirements of a plurality of low-voltage power demand components need to be ensured during power-on and the normal work of the low-voltage power demand components is ensured; and when the voltage of the low-voltage power storage unit is greater than a third preset value, the high-voltage branch circuit is controlled to supply power, and the vehicle can be started normally.
Therefore, the first voltage preset value is smaller than the second voltage preset value and smaller than the third voltage preset value, so that on one hand, the voltage of the low-voltage power storage unit is prevented from being over-discharged or over-charged, and the influence on the service life of the low-voltage power storage unit is avoided; on the other hand, when the vehicle is powered on, the low-voltage power storage unit can work normally on a plurality of low-voltage power demand components.
Referring to fig. 6, the method further comprises: when the vehicle is in a power-on state, the first-stage relay device is controlled to be closed, and the DCDC converter is controlled to convert the high-voltage power of the high-voltage power supply unit into low-voltage power to supply power to the low-voltage power demand component.
Preferably, the low voltage of the DCDC converter is 13V.
Preferably, before controlling the first stage relay device to close when the vehicle is in a power-on or power-off state, the method further comprises: and detecting whether the high-voltage power supply unit has a fault.
A second aspect of the present invention provides a low-voltage power storage unit charging control system to which the control method described in any one of the above is applied, the control system including: a vehicle control unit;
when the vehicle is in a power-off state, the vehicle control unit is used for detecting the voltage of the low-voltage power storage unit;
if the voltage of the low-voltage power storage unit is smaller than the first voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
Further, when the vehicle is in a power-on state, the vehicle control unit is used for detecting the voltage of the low-voltage power storage unit;
if the voltage of the low-voltage power storage unit is smaller than the second voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
A third aspect of the invention provides an unmanned vehicle including the low-voltage power storage unit charging control system described above.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A low-voltage power storage unit charging control method, characterized by comprising:
arranging a low-pressure branch and a high-pressure branch which are separated from each other;
the low-voltage branch circuit comprises a DCDC converter and a low-voltage power storage unit;
arranging a first-stage relay device, wherein one side of the first-stage relay device is electrically connected with a high-voltage power supply unit, and the other side of the first-stage relay device is electrically connected with the low-voltage branch and the high-voltage branch;
detecting whether the voltage of the low-voltage power storage unit is smaller than a first voltage preset value or not when the vehicle is in a power-off state;
if yes, controlling the first-stage relay device to be closed, and controlling the DCDC converter to convert high voltage of the high-voltage power supply unit into low voltage so as to charge the low-voltage power storage unit;
and when the voltage of the low-voltage electric storage unit is detected to be larger than a third voltage preset value, stopping charging the low-voltage electric storage unit.
2. The low-voltage power storage unit charging control method according to claim 1, characterized by comprising:
detecting whether the voltage of the low-voltage power storage unit is smaller than a second preset voltage value or not when the vehicle is in a power-on state;
if yes, the first-stage relay device is controlled to be closed, and the high-voltage electricity of the high-voltage power supply unit is converted into low-voltage electricity through the DCDC converter so as to charge the low-voltage electricity storage unit.
3. The low-voltage power storage unit charging control method according to claim 2, wherein the high-voltage branch circuit includes a high-voltage power demand component, the method further comprising: and a second-stage relay device is arranged between the high-voltage power demand component and the first-stage relay device, and is controlled to be turned on when the vehicle is in a power-on state and the low-voltage power storage unit is charged.
4. The low-voltage power storage unit charging control method according to claim 3, characterized in that, when it is detected that the voltage of the low-voltage power storage unit is greater than a third voltage preset value while the vehicle is in a power-on state and charging the low-voltage power storage unit, the second-stage relay device is controlled to be closed to power-up the high-voltage power demand component at high voltage.
5. The low-voltage power storage unit charging control method according to claim 3 or 4, wherein the second-stage relay device includes a pre-charge relay and a main positive relay that are arranged in parallel, the method comprising: when the voltage of the low-voltage power storage unit is detected to be larger than a third voltage preset value, the pre-charging relay is closed first to pre-charge the high-voltage power demand component, after the pre-charging is completed, the main positive relay is closed to complete the high-voltage power-on of the high-voltage power demand component, and then the pre-charging relay is disconnected.
6. The low-voltage power storage unit charging control method according to any one of claims 2 to 5, characterized in that the first voltage preset value is smaller than the second voltage preset value, and the second voltage preset value is smaller than the third voltage preset value.
7. The low-voltage power storage unit charging control method according to claim 2, characterized by further comprising: and when the vehicle is in a power-on state, controlling the DCDC converter to convert the high-voltage power of the high-voltage power supply unit into low-voltage power to supply power to low-voltage power-demand components.
8. The low-voltage power storage unit charging control method according to claim 1 or 2, characterized by, before controlling the first-stage relay device to be closed while the vehicle is in a power-on or power-off state, further comprising: and detecting whether the high-voltage power supply unit has a fault.
9. A low-voltage power storage unit charging control system to which the control method according to any one of claims 2 to 8 is applied, characterized by comprising: a vehicle control unit;
when the vehicle is in a power-off state, the vehicle control unit is used for detecting the voltage of the low-voltage power storage unit;
if the voltage of the low-voltage power storage unit is smaller than the first voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
10. The low-voltage power storage unit charging control system according to claim 9, wherein the vehicle controller is configured to detect a voltage of the low-voltage power storage unit when the vehicle is in a power-on state;
if the voltage of the low-voltage power storage unit is smaller than the second voltage preset value, the vehicle control unit is used for controlling the first-stage relay device to be closed, enabling the DCDC controller, and converting the high-voltage power of the high-voltage power supply unit into low-voltage power to charge the low-voltage power storage unit.
11. An unmanned vehicle, characterized by comprising the low-voltage power storage unit charging control system according to any one of claims 9 to 10.
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