CN112477597A - DCDC start-stop control method for low-voltage storage battery of electric automobile - Google Patents
DCDC start-stop control method for low-voltage storage battery of electric automobile Download PDFInfo
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- CN112477597A CN112477597A CN202011354754.9A CN202011354754A CN112477597A CN 112477597 A CN112477597 A CN 112477597A CN 202011354754 A CN202011354754 A CN 202011354754A CN 112477597 A CN112477597 A CN 112477597A
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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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- 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
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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
Abstract
The invention discloses a DCDC start-stop control method for a low-voltage storage battery of an electric vehicle, which is characterized in that the voltage of the low-voltage storage battery is obtained according to the discharge characteristic of the low-voltage storage battery at the moment before the DCDC charges the low-voltage storage battery, the first working time of the DCDC and the first stop time of the DCDC are determined according to the voltage of the low-voltage storage battery, then the output voltage of the DCDC is kept unchanged when the DCDC charges the low-voltage storage battery, and after the first stop time of the DCDC is finished, the control process is executed in a circulating. The start-stop time of the DCDC is reasonably adjusted, the discharge characteristic of the low-voltage storage battery is met, and the working efficiency of the DCDC and the energy utilization rate of the whole vehicle are improved.
Description
Technical Field
The invention relates to an automobile battery charging control method, in particular to a start-stop control method for a low-voltage storage battery DCDC of an electric automobile.
Background
The pure electric vehicle generally utilizes the DCDC to convert the high voltage of the power battery into the low voltage to charge the low-voltage storage battery. In the conventional DCDC control method in the prior art, one method is to charge with constant voltage, and although the control method can meet the power consumption requirement of a low-voltage electric appliance, the change of the state of a low-voltage storage battery is not considered, and the change of the working condition of a vehicle and the state of a power battery is not considered, so that the power consumption efficiency of the whole vehicle is reduced. The other is to charge the DCDC to the low-voltage storage battery at different voltages according to the electric quantity state of the low-voltage storage battery, but in such a system, a storage battery electric quantity sensor is required to be added, so that the cost is increased; and the DCDC works at different voltages, the requirement on the DCDC voltage control precision is high, and the control logic is more complex.
Chinese patent CN110315978A discloses a method and a system for charging a low-voltage battery, and an electric vehicle. The control method is that when the vehicle is in static state, whether the low-voltage storage battery is in a power-deficient state or not and whether the power battery is surplus or not are judged to determine whether the vehicle is charged or not, and the charging time is controlled. The method only aims at the charge control of the low-voltage storage battery when the vehicle is in static state, and cannot be applied to the dynamic control process in the driving process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for controlling the start and stop of a low-voltage storage battery DCDC of an electric automobile.
In order to achieve the purpose, the invention provides a start-stop control method for a low-voltage storage battery DCDC of an electric vehicle, which is characterized by comprising the following steps of: the method comprises the steps that the voltage of a low-voltage storage battery is obtained according to the discharge characteristic of the low-voltage storage battery at the moment before the low-voltage storage battery is charged by the DCDC, the first working time of the DCDC and the first stop time of the DCDC are determined according to the voltage of the low-voltage storage battery, then the output voltage of the DCDC is kept unchanged when the DCDC charges the low-voltage storage battery, and after the first stop time of the DCDC is finished, the control process is executed in a circulating mode.
Further, if the low-voltage battery voltage of the next DCDC operation process is less than the last low-voltage battery voltage, the DCDC first operation time is increased and the DCDC first stop time is decreased.
Further, if the voltage of the low-voltage battery in the next DCDC operation process is greater than the voltage of the low-voltage battery in the previous DCDC operation process, the DCDC first operation time is decreased and the DCDC first stop time is increased.
Further, if the voltage of the low-voltage storage battery is smaller than or equal to the lowest working voltage, the DCDC is always in a working state until the high voltage or the charging of the whole vehicle is finished.
Further, if the low-voltage battery voltage is greater than or equal to the maximum operating voltage, the DCDC is always in a stopped state.
Further, after the first working time and the first stopping time of the DCDC are determined according to the voltage of the low-voltage storage battery, the first working time and the first stopping time of the DCDC are corrected according to the acceleration of the vehicle, and the working time and the stopping time of the DCDC are obtained respectively.
Further, the method for correcting according to the acceleration of the vehicle comprises the step that the DCDC working time is the difference between the DCDC first working time and the correction time, and the DCDC stopping time is the sum of the DCDC first stopping time and the correction time.
Further, the method for determining the correction time includes obtaining a product of a correction time base and a correction time coefficient, where the correction time base is a fixed constant.
Further, the method for determining the correction time coefficient includes the steps of obtaining vehicle acceleration, carrying out filtering processing to obtain an acceleration filtering value, and then carrying out fuzzy control according to the acceleration filtering value to obtain the correction time coefficient.
Further, the absolute value of the correction time coefficient and the absolute value of the acceleration filtering value are in positive correlation.
The invention has the beneficial effects that: the start-stop time of the DCDC is reasonably adjusted, the discharge characteristic of the low-voltage storage battery is met, and the working efficiency of the DCDC and the energy utilization rate of the whole vehicle are improved. According to the method, the working time and the stopping time of the DCDC are determined according to the voltage of the low-voltage storage battery, and the starting and stopping time of the DCDC is reasonably adjusted; the obtained voltage of the low-voltage storage battery is used as a charging voltage, and the discharging characteristic of the low-voltage storage battery is met; the voltage of the low-voltage storage battery is acquired in real time after each cycle is finished and is used as the output voltage of the DCDC of the next cycle, so that the constant of each charging voltage can be kept, frequent adjustment can be avoided, and the working efficiency of the DCDC is improved; the DCDC working time is corrected according to the acceleration of the vehicle, the DCDC working time is reduced during acceleration, the DCDC working time is increased during deceleration, and the DCDC working efficiency and the whole vehicle energy utilization rate are further improved.
Drawings
Fig. 1 is a flowchart of a low-voltage battery DCDC start-stop control method of the invention.
FIG. 2 is a schematic diagram of a membership function for acceleration.
FIG. 3 is a diagram of a correction time coefficient membership function.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1, in the method for controlling the start and stop of the low-voltage storage battery DCDC of the electric vehicle, when the high voltage is applied to the whole vehicle, the charging is finished or the failure of the whole vehicle causes the high-voltage power failure, the DCDC stops working; when the high voltage or the charging state of the whole vehicle is realized, the voltage of the low-voltage storage battery is obtained at the moment before the DCDC charges the low-voltage storage battery, the voltage of the low-voltage storage battery is determined by the self discharge characteristic of the low-voltage storage battery, and if the voltage of the low-voltage storage battery is less than or equal to 9V, the DCDC is always in a working state until the high voltage or the charging of the whole vehicle is completed. If the voltage of the low-voltage storage battery is larger than or equal to 15V, the DCDC is always in a stop state until the voltage of the low-voltage storage battery is lower than 15V.
When the voltage of the low-voltage storage battery is larger than 9V and smaller than 15V, firstly, the first working time and the first stopping time of the DCDC are calibrated according to the voltage of the low-voltage storage battery, and the detailed working time and the first stopping time are shown in table 1, wherein unrefined numerical points in the table are obtained through a linear interpolation method.
TABLE 1 DCDC first on-time and first off-time calibration table
As can be seen from table 1, when the low-voltage battery voltage is 9V to 15V, the DCDC first operation time is decreased and the DCDC first stop time is increased in each cycle as the low-voltage battery voltage is increased. The lower voltage storage battery is closer to 9V, the more the low voltage storage battery needs to be charged, so that the first working time of the DCDC needs to be increased, the first stop time of the DCDC needs to be reduced, when the voltage of the low voltage storage battery is lower than 9V, the low voltage storage battery cannot be stably discharged, the low voltage storage battery needs to be continuously charged for supplementing the electric quantity, and when the voltage of the low voltage storage battery is higher than 15V, the low voltage storage battery is in a full-charge state and does not need to be charged.
After the first working time of the DCDC and the first stop time of the DCDC are determined, the acceleration of the vehicle is obtained in real time, filtering processing is carried out on the acceleration, and then fuzzy control is carried out according to the filtered value of the acceleration to obtain a correction time coefficient. In the embodiment, the input of the fuzzy controller is the acceleration of the vehicle, the fuzzy set of the acceleration is { NB, NS, ZE, PS, PB }, the domain of discourse is set to [ -4, 4], and the membership function is shown in FIG. 2; the output of the fuzzy controller is a correction time coefficient, the fuzzy set of the correction time coefficient is { NB, NS, ZE, PS, PB }, the domain of discourse is set to [0.5, 1.5], and the membership function is shown in FIG. 3. Fig. 2 to 3 show the constructed membership function, that is, the rule of determining fuzzy control, and the correction time coefficient corresponding to the acceleration is obtained by fuzzification by using the gravity center method. And then multiplying by a correction time base to obtain the correction time delta T, wherein in the embodiment, the correction time base is set to be 5 min.
After the correction time is obtained, the final DCDC operating time is the difference between the first DCDC operating time and the correction time, and the final DCDC stop time is the sum of the first DCDC stop time and the correction time. In this embodiment, since the acceleration has a positive/negative score, the obtained time coefficient and the correction time also have a positive/negative score. When the acceleration is a positive value, the DCDC working time is shorter than the DCDC first working time, and when the acceleration is a negative value, the DCDC working time is longer than the DCDC first working time.
In this embodiment, the absolute value of the correction time coefficient and the absolute value of the acceleration filter are in positive correlation. Namely, when the acceleration is larger, the correction time coefficient is larger, the correction time is also larger, the DCDC working time is smaller, and the DCDC stopping time is larger. When the deceleration is larger, the correction time coefficient is smaller, the correction time is also smaller, the DCDC working time is larger, and the DCDC stopping time is smaller.
After the DCDC working time and the DCDC stopping time are determined, the controller controls the DCDC output voltage to be 15V and keep constant all the time, the DCDC charges the low-voltage storage battery for a period of time first and then stops charging for a period of time, and after the DCDC stopping time is finished, the control process is executed in a circulating mode until the whole vehicle is in a high-voltage state and is not in a charging state.
Claims (10)
1. A DCDC start-stop control method for a low-voltage storage battery of an electric automobile is characterized by comprising the following steps: the method comprises the steps that the voltage of a low-voltage storage battery is obtained according to the discharge characteristic of the low-voltage storage battery at the moment before the DCDC charges the low-voltage storage battery, the first working time of the DCDC and the first stop time of the DCDC are determined according to the voltage of the low-voltage storage battery, then the output voltage of the DCDC is kept unchanged when the DCDC charges the low-voltage storage battery, and after the first stop time of the DCDC is finished, the control process is executed in a circulating mode.
2. The start-stop control method for the low-voltage storage battery DCDC of the electric automobile according to claim 1, characterized in that: and if the voltage of the low-voltage storage battery in the next DCDC working process is smaller than the voltage of the low-voltage storage battery in the last DCDC working process, increasing the first DCDC working time and reducing the first DCDC stopping time.
3. The start-stop control method for the low-voltage storage battery DCDC of the electric automobile according to claim 1, characterized in that: and if the voltage of the low-voltage storage battery in the next DCDC working process is greater than the voltage of the low-voltage storage battery in the last DCDC working process, reducing the first DCDC working time and increasing the first DCDC stopping time.
4. The start-stop control method for the low-voltage storage battery DCDC of the electric automobile according to claim 1, characterized in that: if the voltage of the low-voltage storage battery is less than or equal to the lowest working voltage, the DCDC is always in a working state until the high voltage or the charging under the whole vehicle is finished.
5. The start-stop control method for the low-voltage storage battery DCDC of the electric automobile according to claim 1, characterized in that: and if the voltage of the low-voltage storage battery is greater than or equal to the highest working voltage, the DCDC is always in a stop state.
6. The DCDC start-stop control method for the low-voltage storage battery of the electric automobile according to claims 1-3, characterized in that: and after determining the first working time and the first stopping time of the DCDC according to the voltage of the low-voltage storage battery, correcting the first working time and the first stopping time of the DCDC according to the acceleration of the vehicle to respectively obtain the working time and the stopping time of the DCDC.
7. The DCDC start-stop control method for the low-voltage storage battery of the electric automobile according to claim 6, characterized in that: the method for correcting the vehicle acceleration comprises the steps that the DCDC working time is the difference between the DCDC first working time and the correction time, and the DCDC stopping time is the sum of the DCDC first stopping time and the correction time.
8. The DCDC start-stop control method for the low-voltage storage battery of the electric automobile according to claim 7, characterized in that: the method for determining the correction time comprises the step of obtaining the product of a correction time base and a correction time coefficient, wherein the correction time base is a fixed constant.
9. The start-stop control method for the low-voltage storage battery DCDC of the electric automobile according to claim 8, characterized in that: the method for determining the correction time coefficient comprises the steps of obtaining vehicle acceleration, carrying out filtering processing to obtain an acceleration filtering value, and then carrying out fuzzy control according to the acceleration filtering value to obtain the correction time coefficient.
10. The electric vehicle low-voltage storage battery DCDC start-stop control method according to claim 9, characterized in that: the correction time coefficient is in positive correlation with the absolute value of the acceleration filtering value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011354754.9A CN112477597A (en) | 2020-11-27 | 2020-11-27 | DCDC start-stop control method for low-voltage storage battery of electric automobile |
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| CN202011354754.9A CN112477597A (en) | 2020-11-27 | 2020-11-27 | DCDC start-stop control method for low-voltage storage battery of electric automobile |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0799706A (en) * | 1993-09-28 | 1995-04-11 | Nippondenso Co Ltd | Auxiliary-equipment battery charging system for electric vehicle |
| DE102009053691A1 (en) * | 2009-11-19 | 2011-05-26 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle electrical system and method and apparatus for operating the electrical system |
| CN106004446A (en) * | 2016-05-31 | 2016-10-12 | 北京现代汽车有限公司 | Charge control method and system for low-voltage storage battery of electric automobile, and vehicle control unit |
| CN106042964A (en) * | 2016-06-27 | 2016-10-26 | 北京新能源汽车股份有限公司 | Control method and device for low-pressure accumulator of electric automobile and electric automobile |
| CN107656210A (en) * | 2017-09-14 | 2018-02-02 | 广州市香港科大霍英东研究院 | A kind of method for estimating battery electric quantity state |
| CN109080560A (en) * | 2018-08-27 | 2018-12-25 | 上海精虹新能源科技有限公司 | A kind of pure electric automobile DCDC control system and control method |
| CN110154823A (en) * | 2019-05-24 | 2019-08-23 | 河南速达电动汽车科技有限公司 | A kind of electric vehicle low tension battery charge control method and entire car controller |
-
2020
- 2020-11-27 CN CN202011354754.9A patent/CN112477597A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0799706A (en) * | 1993-09-28 | 1995-04-11 | Nippondenso Co Ltd | Auxiliary-equipment battery charging system for electric vehicle |
| DE102009053691A1 (en) * | 2009-11-19 | 2011-05-26 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle electrical system and method and apparatus for operating the electrical system |
| CN106004446A (en) * | 2016-05-31 | 2016-10-12 | 北京现代汽车有限公司 | Charge control method and system for low-voltage storage battery of electric automobile, and vehicle control unit |
| CN106042964A (en) * | 2016-06-27 | 2016-10-26 | 北京新能源汽车股份有限公司 | Control method and device for low-pressure accumulator of electric automobile and electric automobile |
| CN107656210A (en) * | 2017-09-14 | 2018-02-02 | 广州市香港科大霍英东研究院 | A kind of method for estimating battery electric quantity state |
| CN109080560A (en) * | 2018-08-27 | 2018-12-25 | 上海精虹新能源科技有限公司 | A kind of pure electric automobile DCDC control system and control method |
| CN110154823A (en) * | 2019-05-24 | 2019-08-23 | 河南速达电动汽车科技有限公司 | A kind of electric vehicle low tension battery charge control method and entire car controller |
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Application publication date: 20210312 |