CN113602146A - Energy management method for pure electric vehicle - Google Patents
Energy management method for pure electric vehicle Download PDFInfo
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- CN113602146A CN113602146A CN202111062219.0A CN202111062219A CN113602146A CN 113602146 A CN113602146 A CN 113602146A CN 202111062219 A CN202111062219 A CN 202111062219A CN 113602146 A CN113602146 A CN 113602146A
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- 238000007726 management method Methods 0.000 title claims abstract description 17
- 238000010586 diagram Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 5
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- 230000004044 response Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
-
- 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
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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]
- B60L58/14—Preventing excessive discharging
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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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a pure electric vehicle energy management method, which comprises the following steps: step 1: determining the permitted use power of battery discharge according to the available power of battery discharge and the power of the direct-current bus; step 2: determining a high-voltage electric appliance which cannot participate in power distribution according to a finished automobile high-voltage electric appliance schematic diagram, and subtracting the power of the high-voltage electric appliance which cannot participate in power distribution from the battery discharging allowable use power to obtain the calculated battery allowable distribution power; and step 3: calculating the actual power of the motor and obtaining the allowable distribution power of the high-voltage accessory by subtracting the actual power of the motor from the allowable distribution power of the battery; and 4, step 4: allowing power distribution to be carried out on the high-voltage accessory through the high-voltage accessory according to the power-on requirement of the high-voltage accessory; and 5: and calculating the available power of the motor, and subtracting the actual power of the high-voltage accessory from the allowable distributed power of the motor to obtain the available power of the motor, wherein the available power of the motor is used for controlling the motor according to the power requirement of the whole vehicle.
Description
Technical Field
The invention relates to the field of power distribution of pure electric vehicles, in particular to an energy management method of a pure electric vehicle.
Background
The energy management function is the indispensable function of pure electric vehicles, and this function rationally distributes the battery electric energy according to real-time charge-discharge ability of battery, annex open mode, the running state of vehicle etc. promotes the driving comfort of vehicle, guarantees to drive safety. The most important part of energy management is power distribution, the response to the demand is realized through the distributed power, the distributed power is taken as the maximum power to limit the work of electric appliances or motors, the disorder of the running power is avoided, the power distribution needs to distribute and control the power of each high-voltage component and the motor of the whole vehicle, when the power distribution has problems, the driving experience of the vehicle is fluctuated or the high-power work of some electric appliances is caused to influence the running power of the motor so as to influence the driving experience, therefore, the power distribution of the pure electric vehicle needs to be controlled to ensure that the vehicle can run according to the distributed power, and related documents in the prior art are not disclosed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pure electric vehicle energy management method for calculating the distribution of the power of the whole vehicle.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pure electric vehicle energy management method comprises the following steps,
step 1: determining the permitted use power of battery discharge according to the available power of battery discharge and the power of the direct-current bus;
step 2: determining a high-voltage electric appliance which cannot participate in power distribution according to a finished automobile high-voltage electric appliance schematic diagram, and subtracting the power of the high-voltage electric appliance which cannot participate in power distribution from the battery discharging allowable use power to obtain the calculated battery allowable distribution power;
and step 3: the method comprises the steps of preferentially distributing power to a motor by using the allowed power of a battery, calculating the actual power of the motor, and subtracting the actual power of the motor from the allowed power of the battery to obtain the allowed power of a high-voltage accessory;
and 4, step 4: allowing power distribution to be carried out on the high-voltage accessory through the high-voltage accessory according to the power-on requirement of the high-voltage accessory;
and 5: and calculating the available power of the motor, and subtracting the actual power of the high-voltage accessory from the allowable distributed power of the motor to obtain the available power of the motor, wherein the available power of the motor is used for controlling the motor according to the power requirement of the whole vehicle.
In the step 1, the available battery discharging power is calculated by the BMS and sent to the CAN network, and the direct current bus power is obtained by calculating the direct current bus voltage and current collected by the BMS; and the VCU acquires and compares the available discharge power of the battery on the CAN network with the power of the direct current bus, and when the power of the direct current bus is less than the available discharge power of the battery, the allowable use power of the discharge of the battery is equal to the available discharge power of the battery.
The VCU obtains the available discharge power of the battery on the CAN network and the power of the direct current bus and compares the available discharge power of the battery with the power of the direct current bus, if the power of the direct current bus is larger than the available discharge power of the battery and keeps the set time, the input of the available discharge power of the battery is limited rapidly so as to reduce the allowable use power of the discharge of the battery until the power of the direct current bus is smaller than the available discharge power of the battery.
In step 2, according to a schematic diagram of the whole vehicle high-voltage electrical appliance, it is determined that the high-voltage electrical appliance which cannot participate in power distribution at least comprises a DCDC converter, the battery allowed discharge power is obtained by subtracting the DCDC actual power, and the DCDC actual power is DCDC input current DCDC input voltage.
In step 3, the battery allowed distributed power subtracts the actual power of the motor to obtain the allowed distributed power of the high-voltage accessory, wherein the actual power of the motor is the motor bus current and the motor bus voltage.
In step 4, two distribution methods are adopted for high-voltage accessory power distribution, two high-voltage accessory power upper limit values x and y are set, wherein x is larger than y and represents that all high-voltage accessories participating in power distribution can work under peak power, so that the set value of x is larger than the sum of the peak powers of all the high-voltage accessories participating in power distribution; the upper limit value of the high-voltage accessory power is y, and the working power of the high-voltage accessory is limited and cannot be higher than y.
If the allowed distributed power of the high-voltage accessory is larger than x, the upper limit value of the power of the high-voltage accessory is controlled by adopting x, and if the allowed distributed power of the high-voltage accessory is smaller than x, the upper limit value of the power of the high-voltage accessory is controlled by adopting y.
And 5, calculating the actual power of the high-voltage accessory according to the requirement of a driver for opening the high-voltage accessory and the upper limit value of the power of the high-voltage accessory, wherein the available power of the motor is equal to the allowable distributed power of the motor minus the actual power of the high-voltage accessory, and the VCU can influence the requirement of a user according to the available power of the motor.
The invention has the advantages that: the power distribution is more reasonable, the power response of the driving requirement is met while the working power requirement of the electric appliances of the vehicle is ensured, all high-voltage electric appliances of the whole vehicle are managed, and the power is sequentially distributed in combination with the action of the electric appliances and the requirement of a driver; preferentially distributing power to the motor to meet the requirement of power priority; the high-voltage accessory adopts two distribution methods, so that the driving experience of the vehicle under a low-power working condition is improved.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic diagram of a power distribution process according to the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The invention provides a method for energy management of a pure electric vehicle, which mainly provides a power distribution strategy for energy management, distributes power to electric appliances and motors in the whole vehicle, and facilitates a VCU to control the motors or the electric appliances to give responses according to demands and distributed power. The method mainly comprises the following steps:
(1) determining the permitted use power of battery discharge according to the available power of battery discharge and the power of the direct-current bus;
(2) according to the high-voltage electric appliance schematic diagram of the whole vehicle, determining high-voltage electric appliances which cannot participate in power distribution, and calculating the allowed distribution power of the battery;
(3) preferentially distributing the power to the motor, and calculating the actual power of the motor and the allowable distributed power of the high-voltage accessory;
(4) distributing high-voltage accessory power;
(5) and calculating the available power of the motor.
The network nodes involved and the associated signals are shown in the following table.
The available power for battery discharge is calculated by the BMS and is sent to the CAN network, and the power of the direct current bus is equal to the current of the direct current bus and the voltage of the direct current bus; the VCU compares the available discharge power of the battery with the power of the direct current bus, and if the power of the direct current bus is smaller than the available discharge power of the battery, the allowable use power of the discharge of the battery is equal to the available discharge power of the battery; if the power of the direct current bus is greater than the available discharge power of the battery and is kept for 0.5s, quickly limiting the available discharge power input of the battery to reduce the allowable use power of the battery until the power of the direct current bus is less than the available discharge power of the battery; if the power of the direct current bus is 1.05 times greater than the available discharge power of the battery and is kept for 0.2s, quickly limiting the available discharge power input of the battery to reduce the allowable use power of the battery discharge until the power of the direct current bus is smaller than the available discharge power of the battery; if the power of the direct current bus is 0.5 times less than the available discharge power of the battery, the driver is considered to have no acceleration requirement temporarily, namely no overcurrent risk exists, and the allowable use power of the discharge of the battery is equal to the available discharge power of the battery; this step is to prevent the vehicle from over-current faults.
According to a finished automobile high-voltage electric appliance schematic diagram, determining high-voltage electric appliances which cannot participate in power distribution, wherein a DCDC converter in a pure electric vehicle is strongly related to vehicle driving, and the DCDC cannot participate in power distribution, the battery allowable discharge use power subtracts the DCDC actual power to obtain the battery allowable distribution power, and the DCDC actual power is DCDC input current and DCDC input voltage.
The actual power of the motor is the current of the motor bus and the voltage of the motor bus, the battery allows the distributed power to subtract the actual power of the motor to obtain the allowed distributed power of the high-voltage accessory, and the power output of the vehicle at the moment is guaranteed not to be interfered by power distribution by preferentially subtracting the actual power of the motor. Detecting the actual power of the motor in real time, firstly ensuring the power requirement of the motor at the moment, and then calculating and controlling the allowable distributed power of the high-voltage accessory;
the high-voltage accessory power distribution adopts two distribution methods, two high-voltage accessory power upper limit values x and y are set, x is larger than y, the high-voltage accessory power upper limit value adopts x, and the high-voltage accessory power upper limit value indicates that all high-voltage accessories participating in power distribution can work under peak power, so that x is larger than the sum of the peak powers of all the high-voltage accessories participating in power distribution; the upper limit value of the high-voltage accessory power is y, and the working power of the high-voltage accessory is limited and cannot be higher than y.
If the allowed distributed power of the high-voltage accessories is larger than x, the upper limit value of the power of the high-voltage accessories is x, and if the allowed distributed power of the high-voltage accessories is smaller than x, the upper limit value of the power of the high-voltage accessories is y.
And calculating the actual power of the high-voltage accessories according to the requirement of a driver for opening the high-voltage accessories and the upper limit value of the power of the high-voltage accessories, wherein the available power of the motor is equal to the allowable distributed power of the motor minus the actual power of the high-voltage accessories. The available power of the motor is the power distributed to the motor for adjustment, and the available power of the motor can be further increased on the basis of the actual power of the motor to control the power operation of the motor.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (7)
1. A pure electric vehicle energy management method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step 1: determining the permitted use power of battery discharge according to the available power of battery discharge and the power of the direct-current bus;
step 2: determining a high-voltage electric appliance which cannot participate in power distribution according to a finished automobile high-voltage electric appliance schematic diagram, and subtracting the power of the high-voltage electric appliance which cannot participate in power distribution from the battery discharging allowable use power to obtain the calculated battery allowable distribution power;
and step 3: the method comprises the steps of preferentially distributing power to a motor by using the allowed power of a battery, calculating the actual power of the motor, and subtracting the actual power of the motor from the allowed power of the battery to obtain the allowed power of a high-voltage accessory;
and 4, step 4: allowing power distribution to be carried out on the high-voltage accessory through the high-voltage accessory according to the power-on requirement of the high-voltage accessory;
and 5: and calculating the available power of the motor, and subtracting the actual power of the high-voltage accessory from the allowable distributed power of the motor to obtain the available power of the motor, wherein the available power of the motor is used for controlling the motor according to the power requirement of the whole vehicle.
2. The energy management method of the pure electric vehicle according to claim 1, characterized in that: in the step 1, the available battery discharging power is calculated by the BMS and sent to the CAN network, and the direct current bus power is obtained by calculating the direct current bus voltage and current collected by the BMS; and the VCU acquires and compares the available discharge power of the battery on the CAN network with the power of the direct current bus, and when the power of the direct current bus is less than the available discharge power of the battery, the allowable use power of the discharge of the battery is equal to the available discharge power of the battery.
3. The energy management method of the pure electric vehicle as claimed in claim 2, characterized in that: the VCU obtains the available discharge power of the battery on the CAN network and the power of the direct current bus and compares the available discharge power of the battery with the power of the direct current bus, if the power of the direct current bus is larger than the available discharge power of the battery and keeps the set time, the input of the available discharge power of the battery is limited rapidly so as to reduce the allowable use power of the discharge of the battery until the power of the direct current bus is smaller than the available discharge power of the battery.
4. The energy management method of the pure electric vehicle as claimed in claim 2 or 3, characterized in that: in step 2, according to a schematic diagram of the whole vehicle high-voltage electrical appliance, it is determined that the high-voltage electrical appliance which cannot participate in power distribution at least comprises a DCDC converter, the battery allowed discharge power is obtained by subtracting the DCDC actual power, and the DCDC actual power is DCDC input current DCDC input voltage.
5. The energy management method of the pure electric vehicle as claimed in claim 2 or 3, characterized in that: in step 3, the battery allowed distributed power subtracts the actual power of the motor to obtain the allowed distributed power of the high-voltage accessory, wherein the actual power of the motor is the motor bus current and the motor bus voltage.
6. The energy management method of the pure electric vehicle as claimed in claim 2 or 3, characterized in that: in step 4, two distribution methods are adopted for high-voltage accessory power distribution, two high-voltage accessory power upper limit values x and y are set, wherein x is larger than y and represents that all high-voltage accessories participating in power distribution can work under peak power, so that the set value of x is larger than the sum of the peak powers of all the high-voltage accessories participating in power distribution; the upper limit value of the high-voltage accessory power is y, and the working power of the high-voltage accessory is limited and cannot be higher than y.
If the allowed distributed power of the high-voltage accessory is larger than x, the upper limit value of the power of the high-voltage accessory is controlled by adopting x, and if the allowed distributed power of the high-voltage accessory is smaller than x, the upper limit value of the power of the high-voltage accessory is controlled by adopting y.
7. The energy management method of the pure electric vehicle as claimed in claim 2 or 3, characterized in that: and 5, calculating the actual power of the high-voltage accessory according to the requirement of a driver for opening the high-voltage accessory and the upper limit value of the power of the high-voltage accessory, wherein the available power of the motor is equal to the allowable distributed power of the motor minus the actual power of the high-voltage accessory, and the VCU can influence the requirement of a user according to the available power of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111062219.0A CN113602146A (en) | 2021-09-10 | 2021-09-10 | Energy management method for pure electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111062219.0A CN113602146A (en) | 2021-09-10 | 2021-09-10 | Energy management method for pure electric vehicle |
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| CN113602146A true CN113602146A (en) | 2021-11-05 |
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| CN202111062219.0A Pending CN113602146A (en) | 2021-09-10 | 2021-09-10 | Energy management method for pure electric vehicle |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103604A1 (en) * | 2016-12-05 | 2018-06-14 | 郑州宇通客车股份有限公司 | Power output control method and device, and power feedback control method and device |
| CN109649183A (en) * | 2018-11-23 | 2019-04-19 | 江苏敏安电动汽车有限公司 | A kind of pure electric automobile energy management and energy reclaiming method |
| CN110920440A (en) * | 2019-12-26 | 2020-03-27 | 深圳威迈斯新能源股份有限公司 | Discharging method and discharging circuit for vehicle-mounted DCDC converter |
| CN113291204A (en) * | 2021-04-13 | 2021-08-24 | 北汽福田汽车股份有限公司 | Electric automobile and battery discharge protection method and device thereof |
-
2021
- 2021-09-10 CN CN202111062219.0A patent/CN113602146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103604A1 (en) * | 2016-12-05 | 2018-06-14 | 郑州宇通客车股份有限公司 | Power output control method and device, and power feedback control method and device |
| CN109649183A (en) * | 2018-11-23 | 2019-04-19 | 江苏敏安电动汽车有限公司 | A kind of pure electric automobile energy management and energy reclaiming method |
| CN110920440A (en) * | 2019-12-26 | 2020-03-27 | 深圳威迈斯新能源股份有限公司 | Discharging method and discharging circuit for vehicle-mounted DCDC converter |
| CN113291204A (en) * | 2021-04-13 | 2021-08-24 | 北汽福田汽车股份有限公司 | Electric automobile and battery discharge protection method and device thereof |
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