CN114559814A - Low-voltage electric power management system of electric automobile - Google Patents
Low-voltage electric power management system of electric automobile Download PDFInfo
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- CN114559814A CN114559814A CN202210447203.XA CN202210447203A CN114559814A CN 114559814 A CN114559814 A CN 114559814A CN 202210447203 A CN202210447203 A CN 202210447203A CN 114559814 A CN114559814 A CN 114559814A
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- voltage electric
- storage battery
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- 238000007599 discharging Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 238000007726 management method Methods 0.000 description 17
- 238000004891 communication Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a low-voltage electric power management system of an electric automobile, which comprises a low-voltage electric power management system, wherein the low-voltage electric power management system comprises an IBS, a VCU, a BMS, a DC/DC and a low-voltage electric system, the IBS is a storage battery sensor and is connected with a storage battery through a new path, the IBS feeds information back to the VCU, the VCU is a whole vehicle controller and is connected with the low-voltage electric system through a line, the VCU is also connected with the BMS through a line, the BMS is a battery pack management system and is connected with the DC/DC through a line, the DC/DC is a direct current converter, and the low-voltage electric system comprises a combination instrument, an air conditioner controller and a seat controller. The invention can monitor the SOC state of the storage battery, the starting state and the electric load of the low-voltage electric system, analyze and process the monitoring information, send out an instruction to control the output power of the DC/DC converter to be adjusted, and simultaneously can remind the related low-voltage electric module to control the actuator thereof to adjust the gear or the power.
Description
Technical Field
The invention relates to the technical field of new energy automobiles and novel intelligent networked automobiles, in particular to a low-voltage electric power management system of an electric automobile.
Background
With the popularization of electric vehicles, due to the pressure on cost, the capacity of an auxiliary battery tends to be smaller and smaller in pure electric vehicles, so that the storage time of some electric vehicles is short, the situation of insufficient power of the auxiliary battery happens occasionally, and the control logic of most electric vehicles is as follows: in a vehicle running state (an ignition switch ON gear), the high-voltage battery charges the auxiliary storage battery through the DC-DC converter, under a common condition, the power of the DCDC converter cannot be intelligently controlled, the conventional pure electric vehicle does not set a protection scheme aiming at the auxiliary storage battery, the power consumption of a vehicle-mounted electric appliance is large when the pure electric vehicle runs for a long time, the risk of power shortage of the auxiliary storage battery is caused when the power of the DC/DC converter does not meet the requirement, in recent years, the electric vehicle industry is rapidly developed, the endurance problem is a problem that the industry faces all the time and needs to be solved urgently, the endurance mileage of the electric vehicle is improved, except for improving the energy density of a battery pack, the efficiency of a driving motor is improved, the power management of a low-voltage electric system of the whole vehicle is a non-negligible important part, and a current mainstream electric vehicle in the industry still uses a whole Vehicle Controller (VCU) or a Battery Management System (BMS) to control the battery pack to provide electric energy for the driving motor through a motor controller (PDU) And the low-voltage electric system of the whole vehicle is supplied with power through a direct current converter (DC/DC). The effective power of the DC/DC converter is determined according to the actual load of the low-voltage electrical system.
However, the conventional automobile battery management method has the following problems: (1) the DC/DC converter is awakened by the BMS and continuously outputs according to rated power, under most working conditions, the power consumption of a low-voltage electric system of the whole vehicle is smaller than DC/DC output power, the storage battery is always in a charging state, and after the storage battery is fully charged, the DC/DC is still output according to the rated power, so that large energy loss exists for a battery pack; (2) when the storage battery is in power shortage and the electric load of the low-voltage electric system is high, the power of the low-voltage electric system is not limited, and the storage battery is over-discharged and damaged. For this reason, a corresponding technical scheme needs to be designed to solve the existing technical problems.
Disclosure of Invention
The invention aims to provide a low-voltage electric power management system of an electric automobile, which is used for monitoring and analyzing different electric quantity load states of a low-voltage electric system of the whole automobile, adjusting the output power of a DC/DC converter to be in the most economic and reasonable range, monitoring and analyzing the state of a storage battery and the starting state of the low-voltage electric system, adjusting the output power of the DC/DC converter and sending a command to control related parts of the low-voltage electric system to adjust the power or gear.
In order to achieve the purpose, the invention provides the following technical scheme: the low-voltage electric power management system of the electric automobile comprises a low-voltage electric power management system, wherein the low-voltage electric power management system comprises an IBS (IBS-based system), a VCU (virtual vehicle management unit), a BMS (battery management unit), a DC/DC (direct current/direct current) and a low-voltage electric system, the IBS is a battery sensor and is connected with a battery through a new path, the IBS feeds information back to the VCU, the VCU is a whole vehicle controller and is connected with the low-voltage electric system through a line, the VCU is also connected with the BMS through a line, the BMS is a battery pack management system and is connected with the DC/DC through a line, the DC/DC is a direct current converter, and the low-voltage electric system comprises a combination instrument, an air conditioner controller and a seat controller.
In a preferred embodiment of the present invention, when the entire vehicle is in the OFF state and the DC/DC is not wakened up, the battery sensor detects the SOC and the voltage of the battery at regular intervals and records the latest detection value.
As a preferred mode of the invention, after the whole vehicle is powered ON, the low-voltage electrical system is in an ON gear, the DC/DC is awakened by the BMS, the IBS sends the latest recorded SOC and voltage value of the storage battery to the VCU, meanwhile, the VCU detects the running state of each module of the whole vehicle low-voltage electrical system, the VCU inputs the state information of the storage battery and the running state of the low-voltage electrical system through comprehensive analysis of the IBS, sends a DC/DC output power instruction to the BMS, and the IBS monitors whether the storage battery is in a charging state or a discharging state in real time after the vehicle runs and sends the recorded result to the VCU.
As a preferred mode of the present invention, when the battery is in a power-shortage state and the low-voltage electrical system is in a high-load operation state, the VCU sends out an instruction to remind the BMS of increasing the DC/DC output power, and simultaneously the VCU sends out an instruction to remind the high-power electricity utilization modules such as an air conditioner and a seat heater to limit the power, and the meter prompts the battery to charge.
As a preferred mode of the present invention, when the battery is in a full state and the low-voltage electrical system is in a high-load operation, the VCU sends a command to prompt the BMS to increase the DC/DC output power.
As a preferred mode of the present invention, when the battery is in a power-shortage state and the low-voltage electrical system is in a low-load operation state, the VCU sends a command to prompt the BMS to increase the DC/DC output power and the meter prompts the battery to charge.
As a preferred mode of the present invention, when the low-voltage electrical system is in low-load operation, the battery is in a full-charge state and is continuously charged, and the VCU sends a command to prompt the BMS to increase the DC/DC power down.
Compared with the prior art, the invention has the following beneficial effects:
1. the power management system can monitor the SOC state of the storage battery, monitor the starting state and the electric load of the low-voltage electric system, analyze and process monitoring information, send an instruction to control the output power of the DC/DC converter to be adjusted, and simultaneously can remind related low-voltage electric modules to control the actuators of the low-voltage electric modules to adjust gears or power.
2. The power management system can analyze and process monitoring information by monitoring the SOC state of the storage battery, the charging or discharging state of the storage battery and the electric load of a low-voltage electric system, and sends an instruction to control the DC/DC to adjust the power.
Drawings
FIG. 1 is a power management communication block diagram of a low-voltage electrical system of an electric vehicle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: this patent needs the electric automobile to possess modules such as battery sensor (IBS), Vehicle Control Unit (VCU), battery package management system (BMS), direct current converter (DC/DC), and the module CAN realize whole car CAN communication, and low voltage electrical system has combination meter, air conditioner controller, seat controller, but not limited to this configuration.
When the whole vehicle is in an OFF state and the DC/DC is not awakened, the storage battery sensor detects the SOC and the voltage of the storage battery at intervals and records the latest detection value;
after the whole vehicle is electrified, the low-voltage electric system is in an ON gear, the DC/DC is awakened by the BMS, the IBS sends the latest recorded storage battery SOC and voltage value to the VCU, meanwhile, the VCU detects the running state of each module of the whole vehicle low-voltage electric system, and the VCU inputs storage battery state information and the running state of the low-voltage electric system through comprehensive analysis of the IBS and sends a DC/DC output power instruction to the BMS. After the vehicle runs, the IBS monitors whether the storage battery is in a charging state or a discharging state in real time, and sends a recording result to the VCU.
(a) When the storage battery is in a power shortage state and a low-voltage electrical system runs in a high load state, the VCU sends an instruction to remind the BMS of improving the DC/DC output power, meanwhile, the VCU sends an instruction to remind high-power electricity utilization modules such as an air conditioner and seat heating to limit the power, and meanwhile, the instrument prompts the storage battery to be charged;
(b) when the storage battery is in a full-charge state and the low-voltage electrical system is in high-load operation, the VCU sends an instruction to remind the BMS of improving the DC/DC output power;
(c) when the storage battery is in a power shortage state and the low-voltage electrical system is in low-load operation, the VCU sends an instruction to remind the BMS of improving the DC/DC output power, and meanwhile, the instrument prompts the storage battery to be charged;
(d) when the low-voltage electrical system is in low-load operation, the storage battery is in a full-charge state and is continuously charged, and at the moment, the VCU sends out an instruction to remind the BMS to increase the DC/DC power reduction.
The control strategy judges that the condition threshold needs to be calibrated in real vehicles, so that the energy utilization rate of the low-voltage electric system of the whole vehicles is always controlled in an optimal state, and the aim of the invention is fulfilled.
The power management system can monitor the SOC state of the storage battery, monitor the starting state and the electric load of the low-voltage electric system, analyze and process monitoring information, send an instruction to control the output power of the DC/DC converter to be adjusted, and simultaneously remind a related low-voltage electric module to control an actuator of the DC/DC converter to adjust the gear or the power.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an electric automobile low pressure electric power management system, includes low pressure electric power management system, its characterized in that: the low-voltage electric power management system comprises IBS, a VCU, a BMS, a DC/DC and a low-voltage electric system, wherein the IBS is a storage battery sensor and is connected with a storage battery through a new path, the IBS feeds information back to the VCU, the VCU is a whole vehicle controller and is connected with the low-voltage electric system through a line, the VCU is also connected with the BMS through a line, the BMS is a battery pack management system and is connected with the DC/DC through a line, the DC/DC is a direct current converter, and the low-voltage electric system comprises a combination instrument, an air conditioner controller and a seat controller.
2. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: when the whole vehicle is in an OFF state and the DC/DC is not awakened, the storage battery sensor detects the SOC and the voltage of the storage battery at intervals and records the latest detection value.
3. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: after the whole vehicle is electrified, the low-voltage electric system is in an ON gear, the DC/DC is awakened by the BMS, the IBS sends the latest recorded SOC and voltage value of the storage battery to the VCU, meanwhile, the VCU detects the running state of each module of the whole vehicle low-voltage electric system, the VCU inputs storage battery state information and the running state of the low-voltage electric system through comprehensive analysis of the IBS, sends a DC/DC output power instruction to the BMS, and the IBS monitors whether the storage battery is in a charging state or a discharging state in real time after the vehicle runs and sends a recording result to the VCU.
4. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: when the battery is in insufficient voltage state, low pressure electrical system is in high load operation simultaneously, then VCU sends the instruction and reminds BMS to improve DC/DC output power, and VCU sends the instruction simultaneously and reminds the air conditioner, high-power electricity modules such as seat heating, limiting power, the instrument suggestion battery charges simultaneously.
5. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: when the storage battery is in a full-charge state and the low-voltage electrical system is in high-load operation, the VCU sends out an instruction to remind the BMS to improve the DC/DC output power.
6. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: when the storage battery is in a power shortage state and the low-voltage electrical system is in low-load operation, the VCU sends out an instruction to remind the BMS to improve the DC/DC output power, and meanwhile, the instrument reminds the storage battery to charge.
7. The low-voltage electric power management system of the electric automobile according to claim 1, characterized in that: when the low-voltage electrical system is in low-load operation, the storage battery is in a full-charge state and is continuously charged, and at the moment, the VCU sends out an instruction to remind the BMS to increase the DC/DC power reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210447203.XA CN114559814A (en) | 2022-04-27 | 2022-04-27 | Low-voltage electric power management system of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210447203.XA CN114559814A (en) | 2022-04-27 | 2022-04-27 | Low-voltage electric power management system of electric automobile |
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| CN114559814A true CN114559814A (en) | 2022-05-31 |
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| CN202210447203.XA Pending CN114559814A (en) | 2022-04-27 | 2022-04-27 | Low-voltage electric power management system of electric automobile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206060330U (en) * | 2016-05-12 | 2017-03-29 | 上海汽车集团股份有限公司 | Vehicle-mounted DC/DC transducers and vehicle-mounted low-voltage power supply system |
| CN110843602A (en) * | 2019-10-30 | 2020-02-28 | 奇瑞商用车（安徽）有限公司 | Low-voltage power supply management system and method for electric automobile |
| CN114228568A (en) * | 2021-12-30 | 2022-03-25 | 优毅时代武汉科技有限公司 | Low-voltage power supply management method and system for electric vehicle |
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- 2022-04-27 CN CN202210447203.XA patent/CN114559814A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206060330U (en) * | 2016-05-12 | 2017-03-29 | 上海汽车集团股份有限公司 | Vehicle-mounted DC/DC transducers and vehicle-mounted low-voltage power supply system |
| CN110843602A (en) * | 2019-10-30 | 2020-02-28 | 奇瑞商用车（安徽）有限公司 | Low-voltage power supply management system and method for electric automobile |
| CN114228568A (en) * | 2021-12-30 | 2022-03-25 | 优毅时代武汉科技有限公司 | Low-voltage power supply management method and system for electric vehicle |
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