CN114407654A - PHEV (hybrid electric vehicle) low-voltage power supply system and control method - Google Patents
PHEV (hybrid electric vehicle) low-voltage power supply system and control method Download PDFInfo
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- CN114407654A CN114407654A CN202210107684.XA CN202210107684A CN114407654A CN 114407654 A CN114407654 A CN 114407654A CN 202210107684 A CN202210107684 A CN 202210107684A CN 114407654 A CN114407654 A CN 114407654A
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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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- 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
Abstract
The invention discloses a PHEV hybrid electric vehicle low-voltage power supply system, which comprises a power battery, a first low-voltage storage battery, a second low-voltage storage battery, a plurality of low-voltage loads and a plurality of control circuits, wherein the first low-voltage storage battery is connected with a low-voltage distribution box through a first change-over switch; the first change-over switch and the second change-over switch are used for respectively controlling the first low-voltage storage battery and the second low-voltage storage battery to be in a connection state, a disconnection state and a diagnosis state; the invention also discloses a control method of the PHEV hybrid electric vehicle low-voltage power supply system, which comprises the steps that when the pure electric mode is switched to the fuel mode, the first low-voltage storage battery supplies power to the starter, and the second low-voltage storage battery supplies power to the whole vehicle low-voltage load; when the low-voltage large-current requirement exists, the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle. The invention improves the stability of the power supply voltage of the low-voltage power supply and meets the requirement of large-current power supply.
Description
Technical Field
The invention relates to the technical field of low-voltage power supply of automobiles, in particular to a low-voltage power supply system of a PHEV (Power-assisted vehicle) hybrid electric vehicle and a control method thereof.
Background
In order to respond to national carbon standard reaching and carbon neutralization target requirements, the PHEV hybrid vehicle type becomes a trend, not only retains the cruising advantage of a fuel vehicle, but also can effectively reduce carbon emission. The PHEV type adds a high-pressure system in the electrical architecture of the original traditional fuel vehicle. The electronic brake system EBB adopted by the PHEV is supplied with power from a 12V framework, the EBB has less brake boosting energy storage compared with a traditional hydraulic brake pump, and in order to prevent brake failure, a storage battery needs to be monitored more strictly. How to realize the high-voltage to low-voltage high-efficiency conversion, how to ensure the stability of a low-voltage power supply of the whole vehicle under different working conditions, how to meet the requirement of the low-voltage peak current of the whole vehicle under extreme working conditions and how to improve the diagnostic capability of a 12V storage battery of the whole vehicle become important research subjects.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a PHEV hybrid electric vehicle low-voltage power supply system and a control method thereof, which can improve the stability and reliability of the low-voltage power supply voltage and meet the requirement of large-current power supply under the limit working condition.
In order to achieve the above object, the present invention provides a PHEV hybrid vehicle low-voltage power supply system, including a power battery and a first low-voltage battery, wherein the power battery is connected to a low-voltage distribution box through a low-voltage DCDC, the first low-voltage battery is connected to the low-voltage distribution box through a first switch, the first low-voltage battery is further connected to a starter and a generator, respectively, and the system further includes a second low-voltage battery, the second low-voltage battery is connected to the low-voltage distribution box through a second switch, and the low-voltage distribution box is connected to a plurality of low-voltage loads of the whole vehicle; the first change-over switch and the second change-over switch are used for respectively controlling the first low-voltage storage battery and the second low-voltage storage battery to be in a connection state, a disconnection state and a diagnosis state with the low-voltage distribution box.
Further, the first switch comprises a first diode, a first main switch and a first resistor which are connected in parallel, the third resistor is connected with a first diagnosis switch and a first diagnosis sensor in series, the first diagnosis sensor is connected with the negative electrode of the first low-voltage storage battery, and the first main switch is connected with the low-voltage distribution box.
Further, the second change-over switch comprises a second diode, a second main switch and a second resistor which are connected in parallel, the second resistor is connected with a second diagnosis switch and a second diagnosis sensor in series, the second diagnosis sensor is connected with the negative pole of the second diagnosis switch, and the second main switch is connected with the low-voltage distribution box.
Further, the first diagnostic sensor and the second diagnostic sensor each include a voltage sensor, a charge sensor, and a temperature sensor.
Further, the whole vehicle low-voltage load comprises a low-voltage electronic brake pump.
The vehicle control unit is in communication connection with the low-voltage DCDC, the low-voltage distribution box, the starter, the generator, the first change-over switch and the second change-over switch respectively.
Further, the vehicle controller is used for controlling the first change-over switch to be in a disconnected state and the second change-over switch to be in a connected state when the pure electric mode is switched to the fuel oil mode, so that the first low-voltage storage battery supplies power to the starter, and the second low-voltage storage battery or the power battery supplies power to a low-voltage load of the vehicle; and when the current required by the low-voltage load of the whole vehicle is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second selector switch is controlled to be in a connected state, so that the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle.
The invention also provides a control method based on the PHEV hybrid electric vehicle low-voltage power supply system, when the pure electric mode is switched to the fuel oil mode, the first change-over switch is controlled to be in a disconnected state, the second change-over switch is controlled to be in a connected state, so that the first low-voltage storage battery supplies power to the starter, and the second low-voltage storage battery supplies power to the whole vehicle low-voltage load; and under the pure electric mode or the fuel mode, when the current required by the low-voltage load of the whole vehicle is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second change-over switch is controlled to be in a communicated state, so that the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle.
Further, when the vehicle is in the pure electric mode, the low-voltage DCDC is started, the first change-over switch and the second change-over switch are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery and the SOC of the second low-voltage storage battery are both smaller than the SOC upper limit value, the power battery is enabled to supply power to the low-voltage load of the whole vehicle, and the first low-voltage storage battery and the second low-voltage storage battery are in a charging state; when the SOC of the first low-voltage storage battery or the second low-voltage storage battery is larger than or equal to the SOC upper limit value, the power battery does not supply power to the low-voltage load of the whole vehicle, and the first low-voltage storage battery or the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle.
Further, when the vehicle is in a fuel mode, the low-voltage DCDC is closed, the first change-over switch and the second change-over switch are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery and the SOC of the second low-voltage storage battery are both smaller than the SOC upper limit value, the generator is enabled to supply power to a low-voltage load of the whole vehicle, and the first low-voltage storage battery and the second low-voltage storage battery are in a charging state; when the SOC of the first low-voltage storage battery or the second low-voltage storage battery is larger than or equal to the SOC upper limit value, the generator does not supply power to the low-voltage load of the whole vehicle, and the first low-voltage storage battery or the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle. Further, when the vehicle is in the diagnosis mode, the first change-over switch and the second change-over switch are controlled to be in the diagnosis state, and the generator or the power battery supplies power to the low-voltage load of the whole vehicle.
The invention has the beneficial effects that: the invention adds a second low-voltage storage battery on the basis of the original first low-voltage storage battery, and the two low-voltage storage batteries are connected with a low-voltage distribution box through a change-over switch which controls the low-voltage storage batteries to be in a connection state, a disconnection state and a diagnosis state; when the pure electric mode is switched to the fuel oil mode, the first low-voltage storage battery is controlled to supply power to the starter, and the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle, so that the influence of unstable output voltage of the generator on the low-voltage load of the whole vehicle when the engine is just started is avoided, and the voltage stability of the low-voltage load of the whole vehicle is ensured; when the current required by the low-voltage load of the whole vehicle is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second low-voltage storage battery supplies power to the low-voltage load of the whole vehicle to meet the extra current requirement besides the first storage battery or the power battery outputting at the maximum current.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage power supply system according to the present invention.
The components in the figures are numbered as follows: the system comprises a power battery 1, a low-voltage DCDC2, a low-voltage distribution box 3, a whole vehicle low-voltage load 4, a motor controller 5, a driving motor 6, a starter 7, a first low-voltage storage battery 8, a first change-over switch 9, a first diode 901, a first main switch 902, a first resistor 903, a first diagnosis switch 904, a first diagnosis sensor 905, a battery sensor 10, a second low-voltage storage battery 11, a second change-over switch 12, a second diode 121, a second main switch 122, a second resistor 123, a second diagnosis switch 124, a second diagnosis sensor 125, a first fuse 13, a second fuse 14, a whole vehicle controller 15, a generator 16 and a whole vehicle low-voltage load 17.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1, a PHEV hybrid electric vehicle low-voltage power supply system includes a power battery 1 and a first low-voltage battery 8, the power battery is connected to a low-voltage distribution box 3 through a low-voltage DCDC2, the positive electrode of the first low-voltage battery 8 is connected to the low-voltage distribution box 3 through a first switch 9, the positive electrode of the first low-voltage battery 8 is connected to a starter 7 and a generator 16 respectively, the system also includes a second low-voltage battery 11 and a vehicle controller 15, the positive electrode of the second low-voltage battery 11 is connected to the low-voltage distribution box 3 through a second switch 12, the low-voltage distribution box 3 is connected to a plurality of vehicle low-voltage loads 17, the vehicle low-voltage loads 17 include a low-voltage electronic brake pump, and the vehicle controller 15 is connected to a low-voltage DCDC2, the low-voltage distribution box 3, the starter 7, the generator 16, the first switch 9 and the second switch 12 in a communication manner, respectively. The low voltage referred to in this example is 12V.
In the above technical solution, the change-over switch 9 includes a first diode 901, a first main switch 902 and a first resistor 903 connected in parallel, one end of each of which is connected to the positive electrode of the first battery 8, a third resistor 903 connected in series to a first diagnostic switch 904 and a first diagnostic sensor 905, the first diagnostic sensor 905 connected to the negative electrode of the first low-voltage battery 8, and the other end of the first main switch 902 connected to the low-voltage distribution box 3.
In the above technical solution, the second change-over switch 12 includes a second diode 121, a second main switch 122 and a second resistor 123 connected in parallel, one end of each of which is connected to the positive electrode of the second battery 11, the second resistor 123 is connected in series to a second diagnostic switch 124 and a second diagnostic sensor 125, the second diagnostic sensor 125 is connected to the negative electrode of the second diagnostic switch 124, and the other end of the second main switch 122 is connected to the low-voltage distribution box 3.
In the above technical solution, the first diagnostic sensor 905 and the second diagnostic sensor 125 both include a voltage sensor, an electric quantity sensor, and a temperature sensor.
In the above technical solution, when the first main switch 902 and the second main switch 122 are closed and the first diagnosis switch 904 and the second diagnosis switch 124 are disconnected, the first low-voltage battery 8 and the second low-voltage battery 11 are in a connected state with the low-voltage distribution box 3, and at this time, the first low-voltage battery 8 and the second low-voltage battery 11 can receive the power battery 1 to be charged through the low-voltage DCDC2, and can also supply power to the low-voltage load 17 of the entire vehicle; when the first main switch 902 and the second main switch 122 are turned off, and the first diagnostic switch 904 and the second diagnostic switch 124 are turned off, the first low-voltage battery 8 and the second low-voltage battery 11 are in an off state with respect to the low-voltage distribution box 3, at this time, the first low-voltage battery 8 and the second low-voltage battery 11 cannot be charged by the power battery 1 through the low-voltage DCDC2 or the low-voltage load 17 of the entire vehicle, and the first battery 8 can only supply power to the starter 7 or receive charging of the generator 16.
When the first main switch 902 and the second main switch 122 are opened and the first diagnostic switch 904 and the second diagnostic switch 124 are closed, the first low-voltage battery 8 and the second low-voltage battery 11 are both in a diagnostic state, the first battery 8, the first resistor 903, the first diagnostic switch 904, and the first diagnostic sensor 905 form a closed circuit, the second battery 11, the second resistor 123, the second diagnostic switch 124, and the second diagnostic sensor 125 form a closed circuit, and the first diagnostic sensor 905 and the second diagnostic sensor 125 acquire voltage, electric quantity, and temperature information of the first battery 8 and the second battery 11, thereby diagnosing whether the first battery and the second battery are operating abnormally.
Among the above-mentioned technical scheme, low pressure electronic brake pump has lacked the braking helping hand energy storage instead of hydraulic brake pump, in order to prevent the braking inefficacy, need take stricter control to the battery
In the technical scheme, the vehicle control unit 15 is used for controlling the first change-over switch 9 to be in a disconnected state and the second change-over switch 12 to be in a connected state when the pure electric mode is switched to the fuel oil mode, so that the first low-voltage storage battery 8 supplies power to the starter 7, and the second low-voltage storage battery 11 or the power battery 1 supplies power to the low-voltage distribution box 3, thereby avoiding the influence on the low-voltage load of the vehicle caused by unstable output voltage of the generator when the engine is just started and ensuring the voltage stability of the low-voltage load of the vehicle; and when the current required by the whole low-voltage load 17 is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second change-over switch 12 is controlled to be in a communicated state, so that the second low-voltage storage battery 11 supplies power to the whole low-voltage load 17, the second low-voltage storage battery 11 and the first low-voltage storage battery 8 or the low-voltage DCDC2 form parallel connection, the output current is increased, and the large-current requirement of the whole low-voltage load under the limit working condition is met.
The control method of the low-voltage power supply system of the PHEV hybrid electric vehicle comprises the following steps:
1. when the pure electric mode is switched to the fuel oil mode, for example, when the SOC of the power battery is lower than the SOC lower limit value, the power battery cannot continue to supply power, the first switch 9 is controlled to be in the off state, the second switch 12 is controlled to be in the on state, so that the first low-voltage storage battery 8 supplies power to the starter 7, and the second low-voltage storage battery 11 supplies power to the whole vehicle low-voltage load 17, thereby avoiding the influence on the whole vehicle low-voltage load caused by unstable output voltage of the generator when the engine is just started, and ensuring the voltage stability of the whole vehicle low-voltage load.
2. When the vehicle is in the pure electric mode, the low-voltage DCDC2 is started, the first change-over switch 9 and the second change-over switch 12 are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery 8 and the SOC of the second low-voltage storage battery 11 are both smaller than the SOC upper limit value, the power battery 1 is enabled to supply power to the low-voltage load 17 of the whole vehicle, and the first low-voltage storage battery 8 and the second low-voltage storage battery 11 are in a charging state; when the SOC of the first low-voltage storage battery 8 or the second low-voltage storage battery 11 is larger than or equal to the SOC upper limit value, the power battery 1 does not supply power to the whole vehicle low-voltage load 17, and the first low-voltage storage battery 8 or the second low-voltage storage battery 11 supplies power to the whole vehicle low-voltage load 17.
3. When the vehicle is in the fuel mode, the low-voltage DCDC2 is closed, the first change-over switch 9 and the second change-over switch 12 are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery 8 and the SOC of the second low-voltage storage battery 11 are both smaller than the SOC upper limit value, the generator 16 supplies power to the low-voltage load 17 of the whole vehicle, and the first low-voltage storage battery 8 and the second low-voltage storage battery 11 are in a charging state; when the SOC of the first low-voltage storage battery 8 or the second low-voltage storage battery 11 is larger than or equal to the SOC upper limit value, the generator 16 does not supply power to the whole vehicle low-voltage load 17, and the first low-voltage storage battery 8 or the second low-voltage storage battery 11 supplies power to the whole vehicle low-voltage load 17.
4. When the vehicle is in a standby mode, the low-voltage DCDC2 is closed, the starter and the generator do not work, and the first switch is preferentially controlled to be in a communicated state, so that the first storage battery supplies power to the low-voltage load of the whole vehicle; when the electric quantity of the first storage battery is insufficient, the second change-over switch is controlled to be in a connected state, so that the second storage battery supplies power to the low-voltage load of the whole vehicle, and the loss of the static current in a standby state is met.
In the pure electric mode or the fuel mode, when the current required by the whole low-voltage load 17 is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage battery, for example, when a steering wheel is suddenly turned on during low-speed running on snowy ground, and a brake is suddenly stepped on, in addition to the power battery 1 or the first low-voltage battery 8 supplying power to the whole low-voltage load 17, the second change-over switch 12 is controlled to be in a connected state, so that the second low-voltage battery 11 supplies power to the whole low-voltage load 17, part of non-critical equipment is turned off, and 50% of steering assistance is limited.
In the pure electric mode or the fuel oil mode, the first change-over switch 9 and the second change-over switch 12 are controlled to be in a diagnosis state at regular intervals, so that the first storage battery or the second storage battery enters the diagnosis mode, and at the moment, the generator 16 or the power battery 1 is controlled to supply power to the low-voltage load 17 of the whole vehicle.
Claims (10)
1. The utility model provides a PHEV hybrid vehicle low pressure power supply system which characterized in that: the power battery is connected with a low-voltage distribution box (3) through a low-voltage DCDC (2), the first low-voltage storage battery (8) is connected with the low-voltage distribution box (3) through a first change-over switch (9), the first low-voltage storage battery (8) is further connected with a starter (7) and a generator (16) respectively, the power battery further comprises a second low-voltage storage battery (11), the second low-voltage storage battery (11) is connected with the low-voltage distribution box (3) through a second change-over switch (12), and the low-voltage distribution box (3) is connected with a plurality of finished automobile low-voltage loads (17); the first and second change-over switches (9, 12) are used to control the connection, disconnection and diagnosis between the first and second low-voltage accumulators (8, 11) and the low-voltage distribution box (3), respectively.
2. The PHEV hybrid vehicle low-voltage power supply system of claim 1, wherein: the vehicle-mounted controller is characterized by further comprising a vehicle control unit (15), wherein the vehicle control unit (15) is in communication connection with the low-voltage DCDC (2), the low-voltage distribution box (3), the starter (7), the generator (16), the first change-over switch (9) and the second change-over switch (12) respectively.
3. The PHEV hybrid vehicle low-voltage power supply system of claim 2, wherein: the vehicle control unit (15) is used for controlling the first change-over switch (9) to be in a disconnected state and the second change-over switch (12) to be in a connected state when the pure electric mode is switched to the fuel oil mode, so that the first low-voltage storage battery (8) supplies power to the starter (7), and the second low-voltage storage battery (11) or the power battery (1) supplies power to the low-voltage distribution box (3); and when the current required by the low-voltage load (17) of the whole vehicle is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second selector switch (12) is controlled to be in a communicated state, so that the second low-voltage storage battery (11) supplies power to the low-voltage load (17) of the whole vehicle.
4. The PHEV hybrid vehicle low-voltage power supply system of claim 1, wherein: the first change-over switch (9) comprises a first diode (901), a first main switch (902) and a first resistor (903) which are connected in parallel, the third resistor (903) is connected with a first diagnosis switch (904) and a first diagnosis sensor (905) in series, the first diagnosis sensor (905) is connected with the negative electrode of a first low-voltage storage battery (8), and the first main switch (902) is connected with a low-voltage distribution box (3).
5. The PHEV hybrid vehicle low-voltage power supply system of claim 1, wherein: the second change-over switch (12) comprises a second diode (121), a second main switch (122) and a second resistor (123) which are connected in parallel, the second resistor (123) is connected with a second diagnosis switch (124) and a second diagnosis sensor (125) in series, the second diagnosis sensor (125) is connected with the negative pole of the second diagnosis switch (124), and the second main switch (122) is connected with the low-voltage distribution box (3).
6. The PHEV hybrid vehicle low-voltage power supply system of claim 1, wherein: the first diagnostic sensor (905) and the second diagnostic sensor (125) each include a voltage sensor, a charge sensor, and a temperature sensor.
7. A control method of a PHEV hybrid electric vehicle low-voltage power supply system based on any one of claims 1-6, characterized by comprising the following steps: when the pure electric mode is switched to the fuel mode, the first change-over switch (9) is controlled to be in a disconnected state, the second change-over switch (12) is controlled to be in a connected state, so that the first low-voltage storage battery (8) supplies power to the starter (7), and the second low-voltage storage battery (11) supplies power to a low-voltage load (17) of the whole vehicle; under the pure electric mode or the fuel mode, when the current required by the whole vehicle low-voltage load (17) is greater than the maximum output current of the low-voltage DCDC and greater than the maximum output current of the first low-voltage storage battery, the second change-over switch (12) is controlled to be in a communicated state, and the second low-voltage storage battery (11) supplies power to the whole vehicle low-voltage load (17).
8. The method for controlling the low-voltage power supply system of the PHEV hybrid electric vehicle as recited in claim 7, wherein: when the vehicle is in the pure electric mode, the low-voltage DCDC (2) is started, the first change-over switch (9) and the second change-over switch (12) are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery (8) and the SOC of the second low-voltage storage battery (11) are both smaller than the SOC upper limit value, the power battery (1) is enabled to supply power to a low-voltage load (17) of the whole vehicle, and the first low-voltage storage battery (8) and the second low-voltage storage battery (11) are in a charging state; when the SOC of the first low-voltage storage battery (8) or the second low-voltage storage battery (11) is larger than or equal to the SOC upper limit value, the power battery (1) does not supply power to the low-voltage load (17) of the whole vehicle, and the first low-voltage storage battery (8) or the second low-voltage storage battery (11) supplies power to the low-voltage load (17) of the whole vehicle.
9. The method for controlling the low-voltage power supply system of the PHEV hybrid electric vehicle as recited in claim 7, wherein: when the vehicle is in a fuel mode, the low-voltage DCDC (2) is closed, the first change-over switch (9) and the second change-over switch (12) are controlled to be in a communicated state, when the SOC of the first low-voltage storage battery (8) and the SOC of the second low-voltage storage battery (11) are both smaller than the SOC upper limit value, the generator (16) is enabled to supply power to a low-voltage load (17) of the whole vehicle, and the first low-voltage storage battery (8) and the second low-voltage storage battery (11) are in a charging state; when the SOC of the first low-voltage storage battery (8) or the second low-voltage storage battery (11) is larger than or equal to the SOC upper limit value, the generator (16) does not supply power to the low-voltage load (17) of the whole vehicle, and the first low-voltage storage battery (8) or the second low-voltage storage battery (11) supplies power to the low-voltage load (17) of the whole vehicle.
10. The method for controlling the low-voltage power supply system of the PHEV hybrid electric vehicle as recited in claim 7, wherein: when the vehicle is in the diagnosis mode, the first change-over switch (9) and the second change-over switch (12) are controlled to be in the diagnosis state, and the generator (16) or the power battery (1) supplies power to the low-voltage load (17) of the whole vehicle.
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| US20210094441A1 (en) * | 2016-04-01 | 2021-04-01 | Faraday&Future Inc. | Electric vehicle battery management |
| CN113752837A (en) * | 2021-09-29 | 2021-12-07 | 中国第一汽车股份有限公司 | Low-voltage power supply control system and method for vehicle |
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2022
- 2022-01-28 CN CN202210107684.XA patent/CN114407654A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060201724A1 (en) * | 2005-03-10 | 2006-09-14 | Jean-Francois Leblanc | Isolated dual battery system |
| US20110198920A1 (en) * | 2010-02-12 | 2011-08-18 | Fuji Jukogyo Kabushiki Kaisha | Vehicle power supply apparatus |
| US20210094441A1 (en) * | 2016-04-01 | 2021-04-01 | Faraday&Future Inc. | Electric vehicle battery management |
| CN110103855A (en) * | 2019-04-18 | 2019-08-09 | 浙江吉利控股集团有限公司 | A kind of distribution system and method for mixed motor-car |
| CN113752837A (en) * | 2021-09-29 | 2021-12-07 | 中国第一汽车股份有限公司 | Low-voltage power supply control system and method for vehicle |
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