CN112208360B - Auxiliary low-voltage power supply system of pure electric vehicle - Google Patents
Auxiliary low-voltage power supply system of pure electric vehicle Download PDFInfo
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- CN112208360B CN112208360B CN202011160517.9A CN202011160517A CN112208360B CN 112208360 B CN112208360 B CN 112208360B CN 202011160517 A CN202011160517 A CN 202011160517A CN 112208360 B CN112208360 B CN 112208360B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/14—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines using DC generators and AC motors
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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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- Engineering & Computer Science (AREA)
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses an auxiliary low-voltage power supply system of a pure electric vehicle, which comprises a driving motor and a generator connected with the output end of the driving motor through a transmission device, wherein the output end of the generator is electrically connected with vehicle-mounted low-voltage electric equipment; the generator is a low voltage dc generator. The invention solves the problem that the DC/DC converter in the prior art is easy to generate heat to cause faults, and effectively reduces the fault occurrence rate.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to an auxiliary low-voltage power supply system of a pure electric vehicle.
Background
With the rapid development of industries such as new energy, pure electric vehicles are more and more popular, are not limited to small passenger vehicles, and further appear in medium and large passenger vehicles and engineering vehicles. In the power supply system of the pure electric vehicle at the present stage, high voltage output by a power battery is supplied to a driving motor to drive the vehicle, and vehicle-mounted low-voltage electric equipment needs to be driven by low-voltage direct current, so that a DC/DC converter is required to be installed in an electric control system to convert the high voltage into low voltage, and the situation that the DC/DC converter generates large heat in the actual use process, so that overheating damage and even a main wiring harness is burnt is often caused. However, the above technical solutions only alleviate or find possible faults in advance to a certain extent, and cannot really solve the problem. Meanwhile, the DC/DC converter is high in cost, so that the overall cost of the electric control system is not reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the auxiliary low-voltage power supply system of the pure electric vehicle, which can effectively avoid the overheating damage of the DC/DC converter.
The auxiliary low-voltage power supply system of the pure electric vehicle comprises a driving motor and a generator connected with the output end of the driving motor through a transmission device, wherein the output end of the generator is electrically connected with vehicle-mounted low-voltage electric equipment; the generator is a low voltage dc generator.
Preferably, the driving motor and the low-voltage direct-current generator are of a double-motor integrated structure; the double-motor integrated structure comprises two columnar cavities consisting of a shell and a rear end cover, and a stator assembly consisting of a driving motor stator and a generator stator and a rotor assembly consisting of a driving motor rotor and a generator rotor are arranged in the two columnar cavities; and the two ends of the rotor assembly are respectively provided with a front end bearing and a rear end bearing, and the front end bearing is arranged on the shell through a bearing pressing plate.
Preferably, the motor rotor is single-side output, and the output shaft of the driving motor rotor and the input shaft of the generator rotor are arranged on the same side.
Preferably, the rotation shafts of the drive motor rotor and the generator rotor are arranged in parallel.
Preferably, the transmission device is a gear set or a transmission belt.
Preferably, the output end of the generator is electrically connected with the vehicle-mounted low-voltage electric equipment through a low-voltage controller, and the low-voltage controller is also electrically connected with a low-voltage storage battery;
the low-voltage controller is used for controlling the low-voltage storage battery to charge when the generator runs; and the low-voltage storage battery is also used for controlling the low-voltage storage battery to supply power to the vehicle-mounted low-voltage electric equipment when the generator stops running.
The pure electric vehicle auxiliary low-voltage power supply system comprises a driving motor and a generator, wherein the output end of the driving motor is connected to the input end of the generator through an automatic clutch and a transmission device, and the output end of the generator is electrically connected with the input end of a vehicle-mounted low-voltage electric device; said generator is a low voltage dc generator;
the system also comprises an ECU control unit and a DC/DC converter, wherein the ECU control unit is respectively electrically connected with the DC/DC converter and the automatic clutch, the input end of the DC/DC converter is connected with the power battery, and the output end of the DC/DC converter is connected to the input end of the vehicle-mounted low-voltage electric equipment;
and the ECU control unit is used for controlling the automatic clutch to enable the driving motor to drive the generator to operate when the DC/DC converter fails or has an early warning fault.
Compared with the prior art, the invention has the following beneficial effects:
1. by arranging the single generator in the pure electric vehicle, the generator can be driven to generate low-voltage direct current when the driving motor works normally, and power is continuously provided for low-voltage equipment, so that a DC/DC converter is replaced, the problem that the DC/DC converter in the prior art is easy to generate heat to cause faults is avoided, and the fault occurrence rate is effectively reduced;
2. the rotor output shaft of the driving motor and the input shaft of the generator rotor are arranged on the same side, so that the integrated structure of the double motors is more compact, and the transmission device is easier to arrange and install;
3. by arranging the low-voltage controller and the low-voltage storage battery, the vehicle-mounted low-voltage electric equipment can still normally run under the condition that a DC/DC converter is not arranged and a pure electric vehicle is started or a driving motor and a transmission system cannot be disconnected;
4. by arranging the ECU control unit and the automatic clutch, even if the DC/DC converter has faults or has early warning faults, the system can automatically adjust the automatic clutch through the ECU control unit to drive the driving motor to drive the generator to operate, so that the normal power supply of the vehicle-mounted low-voltage electric equipment is ensured, the shutdown risk is avoided, and the condition that the DC/DC converter burns out a wire harness due to high temperature to endanger the safety of a vehicle is also avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an auxiliary low-voltage power supply system of a pure electric vehicle according to the present invention;
FIG. 2 is an exploded view of a dual-motor integrated structure of the auxiliary low-voltage power supply system of the pure electric vehicle according to the present invention;
FIG. 3 is a schematic structural diagram of an auxiliary low-voltage power supply system of a pure electric vehicle according to still another embodiment of the invention;
FIG. 4 is a schematic structural diagram of another embodiment of an auxiliary low-voltage power supply system of the pure electric vehicle according to the invention;
wherein, 1, a shell; 2. a rotor assembly; 3. a stator assembly; 4. a rear end cap; 5. oil sealing; 6. a front end bearing; 7. a bearing pressure plate; 8. a sealing gasket; 9. a rear end bearing; 10. a drive motor; 11. a generator; 12. vehicle-mounted low-voltage electric equipment; 13. an inverter; 14. a power battery; 15. a gearbox; 16. a power system; 17. a low-voltage controller; 18. a low-voltage battery; 19. an automatic clutch; 20. an ECU control unit; 21. a DC/DC converter.
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.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An auxiliary low-voltage power supply system of a pure electric vehicle is shown in fig. 1, and comprises a driving motor 10 and a generator 11 connected with an output end of the driving motor 10 through a transmission device, wherein an output end of the generator 11 is electrically connected with a vehicle-mounted low-voltage electric device 12; the generator 11 is a low voltage dc generator.
Wherein, the input end of the driving motor can be connected with a power battery 14 through an inverter 13. The output end of the driving motor 10 is connected with a power system 16 through a gearbox 15. The vehicle-mounted low-voltage electric equipment can comprise, but is not limited to, a power steering system, an air conditioner, a vehicle control unit, a motor controller and other auxiliary equipment. The transmission may be a gear set or a belt. In the embodiment, the driving motor drives the low-voltage direct-current generator to operate through the transmission device so as to continuously provide power for the low-voltage equipment, a DC/DC converter is replaced, the problem that the DC/DC converter in the prior art is prone to heating and causes faults is solved, and the fault occurrence rate is effectively reduced.
In one embodiment, as shown in fig. 2, the driving motor 10 and the generator 11 are a dual-motor integrated structure; the interior of the double-motor integrated structure comprises two columnar cavities consisting of a shell 1 and a rear end cover 4, and a stator assembly 3 consisting of a driving motor stator and a generator stator and a rotor assembly 2 consisting of a driving motor rotor and a generator rotor are arranged in the two columnar cavities; two ends of the rotor assembly 2 are respectively provided with a front end bearing 6 and a rear end bearing 9, and the front end bearing 6 is installed on the machine shell 1 through a bearing pressing plate 7.
Wherein, the casing and the rear end cover can form a cubic combined structure. A sealing gasket 8 can be arranged between the shell and the rear end cover. And a gear set can be adopted between the output end of the driving motor and the input end of the generator for transmission.
As an optimized embodiment, the output shaft of the driving motor rotor and the input shaft of the generator rotor are arranged on the same side.
The driving motor rotor can adopt unilateral output, the output shaft of the driving motor rotor and the input shaft of the generator rotor can respectively extend out of the through hole at the front end of the machine shell 1, and an oil seal 5 can be arranged at the through hole.
In the embodiment, the rotor output shaft of the driving motor and the input shaft of the generator rotor are arranged on the same side, so that the integrated structure of the double motors is more compact, and the transmission device is easier to set and install.
As an optimized embodiment, the rotating shafts of the driving motor rotor and the generator rotor are arranged in parallel.
In one embodiment, as shown in fig. 3, the output end of the generator 11 is electrically connected with the vehicle-mounted low-voltage electric equipment 12 through a low-voltage controller 17, and the low-voltage controller 17 is also electrically connected with a low-voltage storage battery 18;
the low-voltage controller 17 is used for controlling the low-voltage storage battery 18 to charge when the generator 11 operates; and is also used for controlling the low-voltage storage battery 18 to supply power to the vehicle-mounted low-voltage electric equipment 12 when the generator 11 stops running.
The applicant finds that, when a pure electric vehicle is started or does not have the capability of disconnecting a driving motor and a transmission system (namely, the driving motor is directly connected with a wheel train through a speed reducer), if the driving motor stops rotating along with the wheel train, a generator also stops working at the moment, and the running of vehicle-mounted low-voltage electric equipment is influenced. In view of this, the present embodiment adopts a configuration in which the generator output terminal is connected to the vehicle-mounted low-voltage electric equipment through the low-voltage controller, and the low-voltage controller is connected to the low-voltage battery. When the generator operates, the low-voltage controller charges the low-voltage storage battery while the generator supplies power to the vehicle-mounted low-voltage electric equipment; and when the generator stops running, the low-voltage controller switches to the low-voltage storage battery to supply power to the vehicle-mounted low-voltage electric equipment. Therefore, even if no DC/DC converter is arranged, the vehicle-mounted low-voltage electric equipment can still normally run when the pure electric vehicle is started or the driving motor and the transmission system cannot be disconnected.
The auxiliary low-voltage power supply system of the pure electric vehicle is shown in fig. 4 and comprises a driving motor 10 and a generator 11, wherein the output end of the driving motor 10 is connected to the input end of the generator 11 through an automatic clutch 19 and a transmission device, and the output end of the generator 11 is electrically connected with the input end of a vehicle-mounted low-voltage electric device 12; the generator 11 is a low-voltage direct-current generator;
the system further comprises an ECU control unit 20 and a DC/DC converter 21, wherein the ECU control unit 20 is electrically connected with the DC/DC converter 21 and the automatic clutch 19 respectively, the input end of the DC/DC converter 21 is connected with the power battery 14, and the output end of the DC/DC converter 21 is connected with the input end of the vehicle-mounted low-voltage electric equipment 12;
and the ECU control unit 20 is used for controlling the automatic clutch 19 to enable the driving motor 10 to drive the generator 11 to operate when the DC/DC converter 21 has a fault or an early warning fault.
Wherein, the input end of the driving motor 10 can be connected with a power battery 14 through an inverter 13. The output of the drive motor 10 may also be connected to a power system 16 via a gearbox 15.
When the system works under normal conditions, the DC/DC converter is used as the high-low voltage conversion unit to directly supply power to the vehicle-mounted low-voltage electric equipment, and at the moment, the generator and the driving motor are in a disconnected state and do not work, so that the system can be ensured to have higher electric energy utilization rate; once the DC/DC converter has faults or gives an early warning, the system can automatically adjust the automatic clutch through the ECU to enable the driving motor to drive the generator to operate so as to ensure the normal power supply of the vehicle-mounted low-voltage electric equipment, avoid the shutdown risk and prevent the DC/DC converter from burning the wire harness due to high temperature to endanger the safety of the vehicle.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The auxiliary low-voltage power supply system of the pure electric vehicle is characterized by comprising a driving motor and a generator connected with the output end of the driving motor through a transmission device, wherein the output end of the generator is electrically connected with vehicle-mounted low-voltage electric equipment; the generator is a low voltage dc generator;
the driving motor and the low-voltage direct-current generator are of a double-motor integrated structure; the double-motor integrated structure comprises two columnar cavities consisting of a shell and a rear end cover, and a stator assembly consisting of a driving motor stator and a generator stator and a rotor assembly consisting of a driving motor rotor and a generator rotor are arranged in the two columnar cavities; and the two ends of the rotor assembly are respectively provided with a front end bearing and a rear end bearing, and the front end bearing is arranged on the shell through a bearing pressing plate.
2. Auxiliary low-voltage power supply system for a pure electric vehicle according to claim 1, characterized in that:
the output shaft of the driving motor rotor and the input shaft of the generator rotor are arranged on the same side.
3. Auxiliary low-voltage power supply system for a pure electric vehicle according to claim 2, characterized in that:
and the rotating shafts of the driving motor rotor and the generator rotor are arranged in parallel.
4. Auxiliary low-voltage power supply system for a pure electric vehicle according to claim 1, characterized in that:
the transmission device is a gear set or a transmission belt.
5. Auxiliary low-voltage power supply system for a pure electric vehicle according to claim 1, characterized in that:
the output end of the generator is electrically connected with the vehicle-mounted low-voltage electric equipment through a low-voltage controller, and the low-voltage controller is also electrically connected with a low-voltage storage battery;
the low-voltage controller is used for controlling the low-voltage storage battery to charge when the generator runs; and the low-voltage storage battery is also used for controlling the low-voltage storage battery to supply power to the vehicle-mounted low-voltage electric equipment when the generator stops running.
6. The auxiliary low-voltage power supply system of the pure electric vehicle is characterized by comprising a driving motor and a generator, wherein the output end of the driving motor is connected to the input end of the generator through an automatic clutch and a transmission device, and the output end of the generator is electrically connected with the input end of vehicle-mounted low-voltage electric equipment; the generator is a low voltage dc generator;
the system also comprises an ECU control unit and a DC/DC converter, wherein the ECU control unit is respectively electrically connected with the DC/DC converter and the automatic clutch, the input end of the DC/DC converter is connected with the power battery, and the output end of the DC/DC converter is connected to the input end of the vehicle-mounted low-voltage electric equipment;
and the ECU control unit is used for controlling the automatic clutch to enable the driving motor to drive the generator to operate when the DC/DC converter fails or has an early warning fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160517.9A CN112208360B (en) | 2020-10-27 | 2020-10-27 | Auxiliary low-voltage power supply system of pure electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160517.9A CN112208360B (en) | 2020-10-27 | 2020-10-27 | Auxiliary low-voltage power supply system of pure electric vehicle |
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| CN112208360A CN112208360A (en) | 2021-01-12 |
| CN112208360B true CN112208360B (en) | 2022-03-25 |
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| CN202011160517.9A Expired - Fee Related CN112208360B (en) | 2020-10-27 | 2020-10-27 | Auxiliary low-voltage power supply system of pure electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113858951A (en) * | 2021-11-11 | 2021-12-31 | 北奔重型汽车集团有限公司 | A recharge system for auxiliary system of pure electric commercial vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4143267B2 (en) * | 2001-01-18 | 2008-09-03 | トヨタ自動車株式会社 | Vehicle power supply device |
| DE102007004279A1 (en) * | 2007-01-23 | 2008-07-24 | Bayerische Motoren Werke Aktiengesellschaft | Multi-voltage vehicle electrical system for a motor vehicle |
| CN101764512B (en) * | 2010-01-29 | 2012-06-27 | 重庆长安汽车股份有限公司 | DCDC (direct current-direct current) control method of moderate hybrid electric vehicle |
| CN103192717B (en) * | 2013-04-09 | 2015-06-10 | 郑州宇通客车股份有限公司 | Low-voltage power supply system of hybrid power automobile and control method thereof |
| JP6694156B2 (en) * | 2016-03-30 | 2020-05-13 | 三菱自動車工業株式会社 | Control device for hybrid vehicle |
| CN106740043B (en) * | 2017-03-03 | 2023-09-26 | 中国第一汽车股份有限公司 | Power assembly device for range-extending type electric vehicle |
| CN109808495A (en) * | 2019-01-22 | 2019-05-28 | 浙江合众新能源汽车有限公司 | A kind of new-energy automobile of low voltage generator substitution part DC-DC converter |
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