CN112455285A - DCDC (direct current drive) intermittent control method for pure electric vehicle - Google Patents
DCDC (direct current drive) intermittent control method for pure electric vehicle Download PDFInfo
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- CN112455285A CN112455285A CN202011361496.7A CN202011361496A CN112455285A CN 112455285 A CN112455285 A CN 112455285A CN 202011361496 A CN202011361496 A CN 202011361496A CN 112455285 A CN112455285 A CN 112455285A
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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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a DCDC intermittent control method of a pure electric vehicle, which is characterized in that when the voltage of the whole vehicle is high or in a charging state, the discharge characteristic and the voltage of a storage battery are obtained, and the working time, the stop time and the output voltage of the DCDC are determined according to the discharge characteristic and the voltage of the storage battery. The invention does not need to increase an electric quantity sensor, the DCDC works with single voltage, the DCDC works simply and easily, and the control on the DCDC is also simple and easy, thereby greatly reducing the cost. According to the discharging characteristic and the voltage of the storage battery, the DCDC works in different modes and a corresponding control method is adopted, so that the power utilization requirement of the power battery of the whole vehicle is met, the power utilization state and the DCDC working efficiency are fully considered, the DCDC working efficiency is improved, the power utilization efficiency of the whole vehicle is effectively improved, and the energy is saved.
Description
Technical Field
The invention relates to charging of a low-voltage battery, in particular to a DCDC intermittent control method for a pure electric vehicle.
Background
The pure electric vehicle is generally standard-equipped with DCDC, which converts high voltage into low voltage to charge the storage battery. In practice, there are two modes of control of DCDC: firstly, the voltage of a storage battery and the working condition of a vehicle are not considered, and the DCDC is always operated at constant voltage; and secondly, acquiring the state of the storage battery through a sensor, and enabling the DCDC to work at different voltages according to the state of the storage battery. The DCDC can still continuously work at constant voltage regardless of the state of the storage battery even under the condition that the electric quantity of the storage battery is sufficient, and although the DCDC is simple, the DCDC can basically meet the power consumption requirement of a low-voltage system, but can waste energy and reduce the conversion efficiency; the latter not only needs to add a storage battery electric quantity sensor, but also the DCDC works under different voltages, the requirements on the components are high, the control is complex, and therefore the cost is increased.
Cn201811195772.x discloses a voltage adjustment method for a dc converter DCDC, which obtains first information of a current temperature of a low-voltage battery and second information of a current remaining battery SOC during enabling of the DCDC, and adjusts an output voltage of the DCDC according to the first information and the second information. The method does not consider the working state of the power battery and the working condition of the whole vehicle, does not consider the energy recovery utilization rate and efficiency, and does not improve the conversion efficiency of the DCDC.
Aiming at the defects in the prior art, the invention provides the pure electric vehicle DCDC intermittent control method which is simple in operation, high in efficiency and easy to control of DCDC. By adopting the invention, the power utilization efficiency of the whole vehicle can be effectively improved, and energy can be saved.
Disclosure of Invention
The invention aims to provide a pure electric vehicle DCDC intermittent control method which is simple in operation, high in efficiency and easy to control of DCDC.
In order to achieve the purpose, the invention adopts the following technical scheme: a DCDC intermittent control method for a pure electric vehicle is characterized by comprising the following steps: when the whole vehicle is in a high voltage state or a charging state, the discharging characteristic and the voltage of the storage battery are obtained, and the working time, the stopping time and the output voltage of the DCDC are determined according to the discharging characteristic and the voltage of the storage battery.
Further, if the voltage of the storage battery is higher than V1, the storage battery is controlled to work in a discharging mode, and the VCU controls the DCDC not to work.
Further, if the voltage of the storage battery is in a range of V2-V1, the storage battery is controlled to work in a balance mode, the VCU controls the DCDC to work intermittently, and in an intermittent working cycle, the working time of the DCDC is shorter than the working stopping time of the DCDC.
Further, if the voltage of the storage battery is in the range of V3-V2, the storage battery is controlled to work in a charging mode, the VCU controls the DCDC to work intermittently, and in an intermittent working cycle, the working time of the DCDC is longer than the working stopping time of the DCDC.
Further, if the voltage of the storage battery is lower than V3, the storage battery is controlled to work in an alarm mode, and the VCU controls the DCDC to work continuously until the high voltage or charging under the whole vehicle is finished.
Further, when the vehicle is accelerating, the power battery is discharging, and the VCU decreases the DCDC operation time or increases the DCDC stop operation time according to the discharge current of the power battery.
Further, in the DCDC working state, calibrating according to the obtained discharge current of the power battery to obtain the corresponding adjustment time t1The working time of the DCDC is set to the original value T1The adjustment is as follows: when T is1-t1>At 0, the working time of DCDC is T1-t1(ii) a Otherwise, the DCDC stops working in advance.
Further, in the DCDC stop working state, according to the obtained power battery discharge current, calibrating to obtain the corresponding adjustment time t2The stop working time of the DCDC is set to the original value T2Is adjusted to T2+t2。
Further, when the vehicle decelerates, the power battery is charging, and the VCU increases the DCDC operation time or decreases the DCDC stop operation time according to the charging current of the power battery.
Further, in the DCDC working state, according to the obtained charging current of the power battery, calibrating to obtain the corresponding adjustment time t3The working time of the DCDC is set to the original value T3Is adjusted to T3+t3(ii) a Under the DCDC stop working state, according to the power battery charging current that obtains, carry out calibration, obtain corresponding adjustment time t4The stop working time of the DCDC is set to the original value T4The adjustment is as follows: when T is4-t4>At 0, the DCDC has a shutdown time of T4-t4(ii) a Otherwise, the DCDC works in advance.
The invention does not need to increase an electric quantity sensor, the DCDC works with single voltage, the DCDC works simply and easily, and the control on the DCDC is also simple and easy, thereby greatly reducing the cost.
According to the discharging characteristic and the voltage of the storage battery, the DCDC works in different modes, the corresponding control method is adopted, the working time, the stopping time and the output voltage of the DCDC are determined, the power utilization state and the DCDC working efficiency of the power battery are fully considered while the power utilization requirement of the power battery of the whole vehicle is met, and the DCDC working efficiency is improved, so that the power utilization efficiency of the whole vehicle is effectively improved, and the energy is saved.
Drawings
FIG. 1 is a schematic control flow diagram of the present invention;
FIG. 2 is a schematic diagram of the control system architecture of the present invention;
fig. 3 is a battery discharge characteristic diagram of the present invention.
Detailed Description
The invention is further described below with reference to the following figures and examples, which should not be construed as limiting the invention.
As shown in the figure, in the intermittent control method for the DCDC of the pure electric vehicle, when the voltage of the whole vehicle is high or in a charging state, the VCU detects the voltage of the storage battery, obtains the discharging characteristic of the storage battery, and determines the working time, the stopping time and the output voltage of the DCDC according to the discharging characteristic and the voltage of the storage battery.
According to the characteristics of the storage battery and the voltage of the storage battery, the operation modes of the DCDC are divided into 4 types:
if the voltage of the storage battery is higher than V1, controlling the DCDC to work in a discharging mode, and controlling the working voltage of the DCDC to be 0 by the VCU;
if the voltage of the storage battery is in a range of V2-V1, controlling the DCDC to work in a balance mode, controlling the DCDC to work intermittently by the VCU, wherein the working time is T1 (for example, 3 minutes, the value can be calibrated), and stopping the working time T2 (for example, 5 minutes, the value can be calibrated);
if the voltage of the storage battery is lower than the range from V3 to V2, controlling the DCDC to work in a charging mode, controlling the DCDC to work intermittently by the VCU, wherein the working time is T3 (for example, 10 minutes, the value can be calibrated), and stopping the working time T4 (for example, 8 minutes, the value can be calibrated);
if the voltage of the storage battery is lower than V3, the DCDC is controlled to work in an alarm mode, the VCU controls the DCDC to work continuously, the instrument gives an alarm, and the VCU judges the voltage state to work in a corresponding mode again according to the power-off and power-on states;
in each working mode, the state can be switched only when the voltage judgment condition is reached and the time reaches the set minimum value, so that the frequent state switching caused by voltage fluctuation is avoided.
The preferred embodiments are: in the scheme, if the voltage of the storage battery is higher than V1, the storage battery is controlled to work in a discharging mode, and the VCU controls the DCDC not to work.
The preferred embodiments are: in the scheme, if the voltage of the storage battery is in a range of V2-V1, the storage battery is controlled to work in a balance mode, the VCU controls the DCDC to work intermittently, and the working time of the DCDC is shorter than the working stopping time of the DCDC in an intermittent working cycle.
The preferred embodiments are: in the scheme, if the voltage of the storage battery is in a range of V3-V2, the storage battery is controlled to work in a charging mode, the VCU controls the DCDC to work intermittently, and the working time of the DCDC is longer than the stop working time of the DCDC in an intermittent working cycle.
The preferred embodiments are: in the scheme, if the voltage of the storage battery is lower than V3, the storage battery is controlled to work in an alarm mode, and the VCU controls the DCDC to work continuously until the high voltage or charging under the whole vehicle is finished.
The preferred embodiments are: in the above scheme, when the vehicle accelerates, the power battery is discharging, and the VCU decreases the DCDC operation time or increases the DCDC stop operation time according to the discharge current of the power battery.
The preferred embodiments are: in the scheme, under the DCDC working state, calibration is carried out according to the obtained discharge current of the power battery, and the corresponding adjustment time t is searched according to the following table1，
| Serial number | Current (A) | DCDC working adjustment time (min) |
| 1 | -100 | 2 |
| 2 | -50 | 1 |
| 3 | 0 | 0 |
| 4 | 100 | 1 |
| 5 | 200 | 3 |
TABLE 1
If there is no corresponding value in the table, the interpolation process is performed to obtain the corresponding adjustment time t1，
The working time of the DCDC is set from the original set value T1The adjustment is as follows: when T is1-t1>At 0, the working time of DCDC is T1-t1(ii) a Otherwise, the DCDC stops working in advance.
The preferred embodiments are: in the scheme, under the condition that the DCDC stops working, calibration is carried out according to the obtained discharge current of the power battery, and the corresponding adjustment time t is searched according to the table 12If there is no corresponding value in the table, the interpolation process is performed to obtain the corresponding adjustment time t2，
The working stopping time of the DCDC is set to be T from the original set value2Is adjusted to T2+t2。
The preferred embodiment of 9 is: in the above scheme, when the vehicle decelerates, the power battery is charging, and the VCU increases the DCDC operation time or decreases the DCDC stop operation time according to the charging current of the power battery.
The preferred embodiment of 10 is: in the scheme, under the DCDC working state, calibration is carried out according to the acquired charging current of the power battery, and the corresponding adjustment time t is searched according to the table 13If there is no corresponding value in the table, the interpolation process is performed to obtain the corresponding adjustment time t3The working time of the DCDC is set to the original value T3Is adjusted to T3+t3(ii) a Under the DCDC stop working state, according to the power battery charging current who obtains, mark, look for corresponding adjustment time t according to table 14If there is no corresponding value in the table, the interpolation process is performed to obtain the corresponding adjustment time t4The stop working time of the DCDC is set to the original value T4The adjustment is as follows: when T is4-t4>At 0, the DCDC has a shutdown time of T4-t4(ii) a Otherwise, the DCDC works in advance.
Those not described in detail in this specification are prior art to the knowledge of those skilled in the art.
Claims (10)
1. A DCDC intermittent control method for a pure electric vehicle is characterized by comprising the following steps: when the whole vehicle is in a high voltage state or a charging state, the discharging characteristic and the voltage of the storage battery are obtained, and the working time, the stopping time and the output voltage of the DCDC are determined according to the discharging characteristic and the voltage of the storage battery.
2. The pure electric vehicle DCDC intermittent control method according to claim 1, characterized in that: and if the voltage of the storage battery is higher than V1, controlling the storage battery to work in a discharging mode, and controlling the DCDC not to work by the VCU.
3. The pure electric vehicle DCDC intermittent control method according to claim 1, characterized in that: and if the voltage of the storage battery is in the range of V2-V1, controlling the storage battery to work in a balanced mode, and controlling the DCDC to work intermittently by the VCU, wherein the working time of the DCDC is shorter than the stop working time of the DCDC in an intermittent working cycle.
4. The pure electric vehicle DCDC intermittent control method according to claim 1, characterized in that: and if the voltage of the storage battery is in the range of V3-V2, controlling the storage battery to work in a charging mode, and controlling the DCDC to work intermittently by the VCU, wherein the working time of the DCDC is longer than the stop working time of the DCDC in an intermittent working cycle.
5. The pure electric vehicle DCDC intermittent control method according to claim 1, characterized in that: if the voltage of the storage battery is lower than V3, the storage battery is controlled to work in an alarm mode, and the VCU controls the DCDC to work continuously until the high voltage or charging under the whole vehicle is finished.
6. The pure electric vehicle DCDC intermittent control method according to claim 3, characterized in that: when the vehicle accelerates, the power battery is discharging, and the VCU reduces the working time of the DCDC or increases the stop working time of the DCDC according to the discharging current of the power battery.
7. The pure electric vehicle DCDC intermittent control method according to claim 6, characterized in that: in the DCDC working state, calibrating according to the obtained discharge current of the power battery to obtain the corresponding adjustment time t1The working time of DCDC is controlled byOriginal set value T1The adjustment is as follows: when T is1-t1>At 0, the working time of DCDC is T1-t1(ii) a Otherwise, the DCDC stops working in advance.
8. The pure electric vehicle DCDC intermittent control method according to claim 6, characterized in that: under the DCDC stop working state, according to the power battery discharge current that obtains, carry out calibration, obtain corresponding adjustment time t2The stop working time of the DCDC is set to the original value T2Is adjusted to T2+t2。
9. The pure electric vehicle DCDC intermittent control method according to claim 4, characterized in that: when the vehicle decelerates, the power battery is charged, and the VCU increases the working time of the DCDC or decreases the stop working time of the DCDC according to the charging current of the power battery.
10. The pure electric vehicle DCDC intermittent control method according to claim 9, characterized in that: in the DCDC working state, calibrating according to the acquired charging current of the power battery to obtain the corresponding adjustment time t3The working time of the DCDC is set to the original value T3Is adjusted to T3+t3(ii) a Under the DCDC stop working state, according to the power battery charging current that obtains, carry out calibration, obtain corresponding adjustment time t4The stop working time of the DCDC is set to the original value T4The adjustment is as follows: when T is4-t4>At 0, the DCDC has a shutdown time of T4-t4(ii) a Otherwise, the DCDC works in advance.
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