CN114194073B - Motor pulse current control method and device and electric automobile - Google Patents
Motor pulse current control method and device and electric automobile Download PDFInfo
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- CN114194073B CN114194073B CN202111556450.5A CN202111556450A CN114194073B CN 114194073 B CN114194073 B CN 114194073B CN 202111556450 A CN202111556450 A CN 202111556450A CN 114194073 B CN114194073 B CN 114194073B
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- current
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/429—Current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a motor pulse current control method and device and an electric automobile, wherein the method comprises the following steps: when the power battery is determined to have the pulse heating requirement, determining a current intermediate parameter based on the received pulse heating current requirement value of the power battery and the acquired current internal resistance of the power battery, and determining a current coefficient based on the acquired current terminal voltage of the power battery; determining the current to be output shaft of the motor based on the current intermediate parameter and the current coefficient; and controlling the motor to output according to the current to be output shaft.
Description
Technical Field
The invention belongs to the technical field of power battery heating, and particularly relates to a motor pulse heating control method and device and an electric automobile.
Background
The charging and discharging capacity of the power battery of the electric vehicle is limited in a low-temperature environment, and the power battery needs to be quickly heated to a proper working temperature for the electric vehicle to be used normally. The high-frequency pulse current can be formed at the two ends of the power battery through the motor pulse current control method, so that the power battery is internally heated, and the heating method can rapidly heat the power battery and has the advantages compared with the traditional PTC heating technology: 1. the heating efficiency is high, and the battery heating efficiency is higher than PTC; 2. no external hardware is required, thereby reducing the heating cost.
However, in the method of motor pulse current control, there are the following problems: in the heating process, the internal resistance and the dynamic voltage of the power battery can change along with the change of factors such as temperature, battery SOC and the like, so that the formed pulse current can change, the heating rate of the power battery can be influenced on one hand, and on the other hand, the risk of overcurrent of components, hardware burning and the like can be caused by the increase of the current.
Disclosure of Invention
The invention provides a motor pulse heating current control method and device and an electric automobile, which are used for realizing accurate control of battery pulse current.
The technical scheme of the invention is as follows:
the invention provides a motor pulse current control method, which comprises the following steps:
when the power battery is determined to have the pulse heating requirement, determining a current intermediate parameter based on the received pulse heating current requirement value of the power battery and the acquired current internal resistance of the power battery, and determining a current coefficient based on the acquired current terminal voltage of the power battery;
determining the current to be output shaft of the motor based on the current intermediate parameter and the current coefficient;
and controlling the motor to output according to the current to be output shaft.
Preferably, the current intermediate parameter corresponding to the pulse heating current request value and the present internal resistance is determined by referring to a first predetermined calibration table;
and determining a current coefficient corresponding to the current terminal voltage by inquiring a second preset calibration table.
Preferably, the product of the current intermediate parameter and the current coefficient is determined as the current to be output by the motor.
Preferably, the method further comprises:
acquiring an axle current output value actually output by the motor based on the axle current;
judging whether the difference value of the shaft current output value and the current to be output shaft is within a preset standard range or not;
and if the difference value between the shaft current output value and the current to be output shaft exceeds the preset standard range, adjusting the shaft voltage of the motor to enable the difference value between the shaft current output value actually output by the motor next and later and the current to be output shaft corresponding to the shaft current output value to be output shaft to gradually approach or enter the preset standard range.
The invention also provides a motor pulse current control device, which comprises:
a first determining module, configured to determine a current intermediate parameter based on the received pulse heating current request value of the power battery and the obtained current internal resistance of the power battery, and determine a current coefficient based on the obtained current terminal voltage of the power battery, when it is determined that the power battery has a pulse heating requirement;
the second determining module is used for determining the current to be output by the motor based on the current intermediate parameter and the current coefficient;
and the control module is used for controlling the motor to output according to the current to be output shaft.
The invention also provides an electric automobile, which comprises the motor pulse current control device.
The technical scheme of the invention is as follows:
the motor pulse current control method along with the change of the battery voltage and the resistance can realize the accurate control of the battery pulse current, thereby ensuring the stable heating rate under different battery voltages and internal resistances and ensuring the reliability and the safety of electric elements.
Drawings
Fig. 1 is a control schematic diagram of a method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, an embodiment of the present invention provides a method for controlling a pulse heating current of a motor, where the method includes:
when the power battery is determined to have the pulse heating requirement, a pulse heating current requirement value of the power battery and the current internal resistance R of the power battery are obtained, and then the pulse current requirement value and the current internal resistance R of the power battery are input into a first preset calibration table to obtain a current intermediate parameter (shown in table 1).
TABLE 1
The current terminal voltage U of the battery is checked out through a second preset calibration table (shown in table 2) x The corresponding current coefficient alpha is lower.
| U x (V) | α x |
| 100 | |
| 200 | |
| 300 | |
| 400 | |
| …… |
TABLE 2
Then, the product of the current intermediate parameter and the current coefficient alpha is utilized to calculate the current to be output shaft which is actually requested.
The current to be output shaft obtained through the first preset calibration table and the second preset calibration table can be stabilized in a certain range only through closed-loop control. The specific control method comprises the following steps: and 1s, acquiring an actual output shaft current calculation average value as a shaft current output value, comparing the shaft current output value with the current to be output shaft, and gradually keeping the actual shaft current output value consistent with the current to be output shaft corresponding to the actual shaft current output value by changing the shaft voltage of the motor.
In this embodiment, the horizontal axis of the first preset calibration table is a pulse heating current request value, and the vertical axis is the current internal resistance of the battery. In the prior experiment, the rated voltage U of the battery N And then, completing current intermediate parameter calibration tests under different battery bus currents under different battery internal resistances to obtain specific values of all heating current request values listed in the table and the current intermediate parameters under the combination of the battery internal resistances.
The second preset calibration table shows the influence of the dynamic voltage of the battery on the pulse current, and the influence is obtained through a calibration test. In the prior experiment, the battery voltage is U x The bus current of the battery is set as rated current, and the internal resistance of the battery is set as nominal resistance R N Calibrating current coefficients, and obtaining different battery voltages U through calculation x Corresponding current coefficient alpha x 。
By precisely controlling the pulse current of the battery, the heating rate under different battery voltages and battery internal resistances is ensured to be stable, and the reliability and the safety of the electric element are ensured.
In addition, in this embodiment, since the three-phase current of the motor is a pulse current that varies with time during the pulse heating process, the current value calculated based on the real-time acquisition value is not a constant value, in order to make the output three-phase current coincide with the demand, the calculated average value of the actual output shaft current acquired within 1s may be compared with the shaft current request value as the output value, and by changing the shaft voltage of the motor, the difference between the subsequent actual shaft current output value and the current to be output shaft is made smaller or enters into a preset standard range, thereby realizing stable control of the pulse current of the motor.
The invention also provides a motor pulse current control device, which comprises:
a first determining module, configured to determine a current intermediate parameter based on the received pulse heating current request value of the power battery and the obtained current internal resistance of the power battery, and determine a current coefficient based on the obtained current terminal voltage of the power battery, when it is determined that the power battery has a pulse heating requirement;
the second determining module is used for determining the current to be output by the motor based on the current intermediate parameter and the current coefficient;
and the control module is used for controlling the motor to output according to the current to be output shaft.
The invention also provides an electric automobile, which comprises the motor pulse current control device.
Claims (4)
1. A motor pulse current control method, characterized by comprising:
when the power battery is determined to have the pulse heating requirement, determining a current intermediate parameter based on the received pulse heating current requirement value of the power battery and the acquired current internal resistance of the power battery, and determining a current coefficient based on the acquired current terminal voltage of the power battery;
determining the current to be output shaft of the motor based on the current intermediate parameter and the current coefficient;
controlling a motor to output according to the current to be output; determining a current intermediate parameter corresponding to the pulse heating current request value and the current internal resistance by querying a first preset calibration table;
determining a current coefficient corresponding to the current terminal voltage by inquiring a second preset calibration table; and determining the product of the current intermediate parameter and the current coefficient as the current to be output shaft of the motor.
2. The method according to claim 1, wherein the method further comprises:
acquiring an axle current output value actually output by the motor based on the axle current;
judging whether the difference value of the shaft current output value and the current to be output shaft is within a preset standard range or not;
and if the difference value between the shaft current output value and the current to be output shaft exceeds the preset standard range, adjusting the shaft voltage of the motor to enable the difference value between the shaft current output value actually output by the motor next and later and the current to be output shaft corresponding to the shaft current output value to be output shaft to gradually approach or enter the preset standard range.
3. A motor pulse current control device, characterized by comprising:
a first determining module, configured to determine a current intermediate parameter based on the received pulse heating current request value of the power battery and the obtained current internal resistance of the power battery, and determine a current coefficient based on the obtained current terminal voltage of the power battery, when it is determined that the power battery has a pulse heating requirement;
the second determining module is used for determining the current to be output by the motor based on the current intermediate parameter and the current coefficient;
the control module is used for controlling the motor to output according to the current to be output shaft;
the first determining module is specifically configured to: determining a current intermediate parameter corresponding to the pulse heating current request value and the current internal resistance by querying a first preset calibration table;
determining a current coefficient corresponding to the current terminal voltage by inquiring a second preset calibration table;
the second determining module is specifically configured to: and determining the product of the current intermediate parameter and the current coefficient as the current to be output shaft of the motor.
4. An electric vehicle comprising the motor pulse current control device according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556450.5A CN114194073B (en) | 2021-12-17 | 2021-12-17 | Motor pulse current control method and device and electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556450.5A CN114194073B (en) | 2021-12-17 | 2021-12-17 | Motor pulse current control method and device and electric automobile |
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| Publication Number | Publication Date |
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| CN114194073A CN114194073A (en) | 2022-03-18 |
| CN114194073B true CN114194073B (en) | 2023-05-23 |
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| CN114194073A (en) | 2022-03-18 |
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Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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