CN111525861A - Motor-based power system braking method, device and system and storage medium - Google Patents
Motor-based power system braking method, device and system and storage medium Download PDFInfo
- Publication number
- CN111525861A CN111525861A CN202010200350.8A CN202010200350A CN111525861A CN 111525861 A CN111525861 A CN 111525861A CN 202010200350 A CN202010200350 A CN 202010200350A CN 111525861 A CN111525861 A CN 111525861A
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- Prior art keywords
- motor
- current
- braking
- instruction
- braking method
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008569 process Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/36—Arrangements for braking or slowing; Four quadrant control
-
- 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
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
Abstract
The embodiment of the invention provides a power system braking method, a device and a system based on a motor and a storage medium, and belongs to the technical field of motor braking. The braking method comprises the following steps: judging whether a braking instruction of the motor is received or not; under the condition of receiving a braking instruction of the motor, determining the current SOC value of the battery; judging whether the SOC value is smaller than or equal to a first preset value; and under the condition that the SOC value is judged to be less than or equal to the first preset value, calculating to obtain a dq-axis current instruction of the motor according to a maximum torque current ratio curve of the motor. The invention provides a braking method, a braking device, a braking system and a storage medium of a power system based on a motor, which adjust a dq current instruction of the motor by adopting a method of maximum torque-current ratio, so that the energy consumed by a stator of the motor is reduced to the maximum extent when a battery is charged.
Description
Technical Field
The invention relates to the technical field of braking of motors, in particular to a power system braking method and system based on a motor and a storage medium.
Background
The energy fed back by braking in the motor braking process can charge the battery, can be converted into copper loss and iron loss of the motor, and can also be converted into heat energy through a mechanical braking device. When the motor is braked, the control strategy is different according to different control targets. For example, to improve the overall efficiency of the system, brake feedback energy may be charged to the battery when the battery is low. When the battery has high power, the battery has limited ability to absorb brake feedback energy in order to ensure safety. It is common practice to convert the brake feedback energy into heat energy through a mechanical brake device for consumption. However, during the process of charging the battery, since the stator current of the motor is not controlled in the prior art, much energy is consumed by the stator of the motor. In the process of converting feedback energy into heat energy to be consumed, because the stator current of the motor is not controlled, the stator of the motor cannot directly consume the heat energy, and a mechanical brake device (brake plate) is additionally arranged when the motor is designed, so that the design cost of the motor is increased. Furthermore, in the event of a failure of the mechanical brake, the brake feedback energy may be consumed everywhere, which may affect the powertrain safety.
Disclosure of Invention
The invention aims to provide a power system braking method, a system and a storage medium based on a motor, which can fully utilize the braking mechanism of the motor to realize safe braking by combining a motor vector control technology.
In order to achieve the above object, an embodiment of the present invention provides a motor-based power system braking method, including:
judging whether a braking instruction of the motor is received or not;
under the condition of receiving a braking instruction of the motor, determining the current SOC value of the battery;
judging whether the SOC value is smaller than or equal to a first preset value;
and under the condition that the SOC value is judged to be less than or equal to the first preset value, calculating to obtain a dq axis current instruction of the motor according to a Maximum Torque Per Ampere (MTPA) curve of the motor.
Optionally, the powertrain braking method further comprises:
and under the condition that the SOC value is larger than the first preset value, calculating to obtain a dq current instruction of the motor according to a Maximum Loss Torque ratio (MLPT) curve of the motor.
Optionally, the powertrain braking method further comprises:
acquiring the current temperature of the motor;
determining the amplitude limiting current of the motor at the current temperature according to a preset corresponding relation curve of the temperature of the motor and the amplitude limiting current;
judging whether the dq-axis current instruction is larger than the amplitude limiting current or not;
and under the condition that the dq-axis current instruction is judged to be larger than the amplitude limiting current, adjusting the dq-axis current instruction to the amplitude limiting current.
Optionally, the powertrain braking method further comprises:
and executing vector control operation on the motor according to the dq-axis current instruction.
Optionally, the first preset value is 80%.
In another aspect, the present disclosure also provides a motor-based powertrain braking apparatus comprising a processor configured to perform any of the powertrain braking methods described above.
In yet another aspect, the present invention also provides a motor-based braking system, comprising:
the SOC measuring module is used for acquiring the current SOC of the battery;
the temperature acquisition module is used for acquiring the current temperature of the battery; and
the power system braking device as described above.
In yet another aspect, the present disclosure also provides a storage medium storing instructions for reading by a machine to cause the machine to perform any of the powertrain braking methods described above.
Through the technical scheme, the motor-based power system braking method, the device, the system and the storage medium provided by the invention adjust the dq current command of the motor by adopting a maximum torque-current ratio method, so that the energy consumed by a motor stator is reduced to the maximum extent when a battery is charged.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a motor-based powertrain braking method according to one embodiment of the present disclosure;
FIG. 2 is a flow chart of a motor-based powertrain braking method according to one embodiment of the present disclosure;
FIG. 3 is a flow chart of a motor-based powertrain braking method according to one embodiment of the present disclosure;
FIG. 4 is a flow chart of a motor-based powertrain braking method according to one embodiment of the present disclosure; and
FIG. 5 is a block diagram of a motor based braking system according to one embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Referring to fig. 1, a flow chart of a method for braking a motor-based powertrain according to an embodiment of the present invention is shown. In fig. 1, the braking method may include:
in step S10, it is determined whether a braking instruction of the motor is received;
in step S11, in the case where a braking instruction of the motor is received, determining the current SOC value of the battery;
in step S12, it is determined whether the SOC value is less than or equal to a first preset value. Wherein, the first preset value can be determined by those skilled in the art according to the state of health of the battery and the load capacity of the motor. In one example of the present invention, the first preset value may be, for example, 80%.
In step S13, in the case where the SOC value is determined to be less than or equal to the first preset value, a dq-axis current command of the motor is calculated from the maximum torque current ratio curve of the motor. In this embodiment, when the SOC value is determined to be less than or equal to the first predetermined value, it indicates that the rechargeable capacity of the battery is sufficient, the brake feedback energy of the motor can be charged back into the battery, and the problem of overcharging does not occur. On the other hand, the loss of the motor during the charging process mainly depends on the copper loss of the motor, which in turn depends on the magnitude of the stator current. For a fixed torque command, the dq-axis current command obtained by calculating the maximum torque current ratio curve can enable the amplitude of the stator current to be minimum, so that the loss of the motor is reduced to the maximum extent, and the efficiency of charging the battery is improved.
For the case that the SOC value is greater than the first preset value, the method in the prior art may be adopted to control the motor. However, in consideration of safety during the conversion into heat, in one embodiment of the present invention, as shown in fig. 2, the power system braking method may further include:
in step S24, when the SOC value is determined to be greater than the first preset value, a dq current command of the motor is calculated according to the maximum loss-torque ratio curve of the motor. In this embodiment, when the SOC is greater than the first predetermined value, the chargeable amount of the battery is small, and if the control method of the SOC is still less than or equal to the first predetermined value, the battery may be overcharged. Therefore, the energy fed back by the motor needs to be converted into heat for consumption at the moment. Therefore, in this embodiment, the dq current command of the motor can be calculated from the maximum loss torque ratio curve of the motor. For a fixed torque command, the maximum loss-to-torque ratio can enable the amplitude of the motor stator current to be maximum, and accordingly the motor loss is also maximum, so that the stator of the motor can consume the feedback energy. Compared with the prior art that energy is consumed by a mechanical brake device (brake plate), the motor brake device has the advantages that the potential fault hazard of the mechanical brake device is avoided, and the design cost and the design volume of a brake system of the motor are reduced.
Consider that the dq-axis current command for the motor should be less than or equal to the limited current for the motor at the present temperature. Therefore, in one embodiment of the present invention, as shown in fig. 3, the power system braking method may further include:
in step S35, the current temperature of the motor is acquired;
in step S36, determining the clipping current of the motor at the current temperature according to a preset correspondence curve between the temperature of the motor and the clipping current;
in step S37, it is determined whether the dq-axis current command is larger than the limiter current;
in step S38, when it is determined that the dq-axis current command is larger than the limiter current, the dq-axis current command is adjusted to the limiter current.
In this embodiment, when the dq-axis current command is less than or equal to the limiter current, the dq-axis current command may not be adjusted at this time.
In one embodiment of the present invention, as shown in fig. 4, the power system braking method further includes:
in step S49, a vector control operation is performed on the motor in accordance with the dq-axis current command.
In another aspect, the present disclosure also provides a motor-based powertrain braking apparatus that may include a processor that may be configured to perform any of the powertrain braking methods described above.
In still another aspect, the present invention further provides a braking system based on a motor, as shown in fig. 5, the braking system may include an SOC measuring module 01, a temperature collecting module 02, and a power system braking device as described above. The SOC measurement module 01 may be used to obtain the current SOC of the battery. The temperature acquisition module 02 may be used to acquire the current temperature of the battery.
In yet another aspect, the present disclosure also provides a storage medium that may store instructions that are readable by a machine to cause the machine to perform any of the powertrain braking methods described above.
Through the technical scheme, the motor-based power system braking method, the device, the system and the storage medium provided by the invention adjust the dq current instruction of the motor by adopting a maximum torque-current ratio method when the electric quantity of the battery is lower, so that the energy consumed by a motor stator is reduced to the maximum extent when the battery is charged; when the battery capacity is high, the dq current instruction of the motor is adjusted by adopting a maximum loss torque ratio method, so that the stator of the motor can consume feedback energy of the motor, and potential safety hazards caused by adopting a mechanical brake device are avoided.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention may be arbitrarily combined with each other, and the embodiments of the present invention should be considered as disclosed in the disclosure of the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.
Claims (8)
1. A motor-based powertrain braking method, comprising:
judging whether a braking instruction of the motor is received or not;
under the condition of receiving a braking instruction of the motor, determining the current SOC value of the battery;
judging whether the SOC value is smaller than or equal to a first preset value;
and under the condition that the SOC value is judged to be less than or equal to the first preset value, calculating to obtain a dq-axis current instruction of the motor according to a maximum torque current ratio curve of the motor.
2. The powertrain braking method of claim 1, further comprising:
and under the condition that the SOC value is judged to be larger than the first preset value, calculating to obtain a dq current instruction of the motor according to a maximum loss torque ratio curve of the motor.
3. The powertrain braking method of claim 1, further comprising:
acquiring the current temperature of the motor;
determining the amplitude limiting current of the motor at the current temperature according to a preset corresponding relation curve of the temperature of the motor and the amplitude limiting current;
judging whether the dq-axis current instruction is larger than the amplitude limiting current or not;
and under the condition that the dq-axis current instruction is judged to be larger than the amplitude limiting current, adjusting the dq-axis current instruction to the amplitude limiting current.
4. The powertrain braking method of claim 1, further comprising:
and executing vector control operation on the motor according to the dq-axis current instruction.
5. The powertrain braking method of claim 1, wherein the first predetermined value is 80%.
6. An electric machine based powertrain braking apparatus, comprising a processor configured to perform the powertrain braking method of any of claims 1-5.
7. An electric machine based braking system, comprising:
the SOC measuring module is used for acquiring the current SOC of the battery;
the temperature acquisition module is used for acquiring the current temperature of the battery; and
the powertrain braking apparatus of claim 5.
8. A storage medium storing instructions for reading by a machine to cause the machine to perform a powertrain braking method as claimed in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200350.8A CN111525861A (en) | 2020-03-20 | 2020-03-20 | Motor-based power system braking method, device and system and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200350.8A CN111525861A (en) | 2020-03-20 | 2020-03-20 | Motor-based power system braking method, device and system and storage medium |
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| Publication Number | Publication Date |
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| CN111525861A true CN111525861A (en) | 2020-08-11 |
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| CN202010200350.8A Pending CN111525861A (en) | 2020-03-20 | 2020-03-20 | Motor-based power system braking method, device and system and storage medium |
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|---|---|---|---|---|
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-
2020
- 2020-03-20 CN CN202010200350.8A patent/CN111525861A/en active Pending
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| US20130151050A1 (en) * | 2011-12-13 | 2013-06-13 | Bing Cheng | Electric power dissipation control |
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| CN105857089A (en) * | 2016-05-25 | 2016-08-17 | 清华大学 | Vehicle control method and device capable of considering both feedback braking and power consuming braking |
| CN107600064A (en) * | 2016-07-12 | 2018-01-19 | 贵航青年莲花汽车有限公司 | A kind of high-low pressure energy management method of whole car controller of hybrid electric car |
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Application publication date: 20200811 |