CN111703312A - Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle - Google Patents

Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle Download PDF

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Publication number
CN111703312A
CN111703312A CN202010632806.8A CN202010632806A CN111703312A CN 111703312 A CN111703312 A CN 111703312A CN 202010632806 A CN202010632806 A CN 202010632806A CN 111703312 A CN111703312 A CN 111703312A
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CN
China
Prior art keywords
hub motor
battery pack
rotating speed
power supply
supply system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010632806.8A
Other languages
Chinese (zh)
Inventor
汪振晓
付邦璀
黄松
李进伟
李�杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfeng Motor Corp
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Dongfeng Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfeng Motor Corp filed Critical Dongfeng Motor Corp
Priority to CN202010632806.8A priority Critical patent/CN111703312A/en
Publication of CN111703312A publication Critical patent/CN111703312A/en
Pending legal-status Critical 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
    • 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
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/19—Switching between serial connection and parallel connection of battery modules
    • 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
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/40—Electrical machine applications
    • B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
    • 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
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—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
    • 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
    • B60L2240/421—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
    • 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
    • B60L2240/423—Torque
    • 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
    • B60L2250/00—Driver interactions
    • B60L2250/26—Driver interactions by pedal actuation
    • 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 discloses a control method of a dual-voltage power supply system of a wheel hub motor of a cross-country vehicle, which is characterized by comprising the following steps of: 1) obtaining vehicle operation parameters to obtain a target rotating speed and a target torque of a hub motor; 2) judging the series-parallel connection mode of the battery pack according to the target rotating speed of the hub motor; 3) and controlling the hub motor to output a target rotating speed and a target torque. The invention controls the input voltage of the hub motor through the switching of the series-parallel connection of the battery pack, and can realize the switching between the low-speed large-torque working condition and the high-speed low-torque working condition according to the driving requirement.

Description

Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle
Technical Field
The invention relates to the technical field of hub motors, in particular to a control method of a dual-voltage power supply system of a cross-country wheel hub motor.
Background
The special cross-country vehicle has the condition of long-time low-speed large-torque running or high-speed low-torque running under the use condition, and in the traditional power vehicle, in order to solve the problems, a general method adopts a high-power engine and a multi-speed-ratio gearbox, and the speed ratio of a transmission system is reasonably adjusted. In the wheel hub motor vehicle, the wheel hub motor is arranged in the wheel hub, the wheel hub motor cannot be enlarged due to space limitation, the input voltage of the wheel hub motor is a fixed value, the maximum output torque of the wheel hub motor is limited, and the dynamic property of the special off-road vehicle is difficult to meet the performance requirement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a control method of a dual-voltage power supply system of a wheel hub motor of an off-road vehicle.
In order to achieve the purpose, the invention provides a control method of a dual-voltage power supply system of a wheel hub motor of a cross-country vehicle, which is characterized by comprising the following steps of: the dual-voltage power supply system comprises a battery pack and a hub motor, wherein a series-parallel switching circuit is connected between the battery pack and the hub motor.
Further, the vehicle operating parameters include accelerator pedal opening, brake pedal opening, and vehicle speed.
Further, the battery pack comprises at least two battery packs with equal output voltage and output current.
Further, when the target rotating speed is less than the rated rotating speed, the battery packs are connected in parallel; and when the target rotating speed is greater than or equal to the rated rotating speed, the battery packs are connected in series.
The invention has the beneficial effects that: according to the invention, the mode of series-parallel connection of the battery packs is determined through the target rotating speed, so that the input voltage and the input current of the hub motor are controlled, the output rotating speed and the output torque of the hub motor are further controlled, and switching between a low-speed large-torque working condition and a high-speed low-torque working condition can be realized according to the driving requirement.
Drawings
FIG. 1 is a schematic diagram of a dual voltage power supply system for a hub motor of a cross-country vehicle.
FIG. 2 is a flow chart of the control method of the present invention.
The components in the figures are numbered as follows: the device comprises a first battery pack 1, a second battery pack 2, a first diode 3, a second diode 4, a change-over switch 5, an anode contactor 6, a cathode contactor 7, a filter capacitor 8, a three-phase inverter bridge 9 and a hub motor 10.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings, which are included to provide a more clear understanding of the invention, but are not intended to limit the invention.
As shown in fig. 1, a cross-country vehicle hub motor dual-voltage power supply system comprises a battery pack and a wheel hub motor 10, wherein the battery pack is composed of a first battery pack 1 and a second battery pack 2 with equal output voltage and output current, the system further comprises a series-parallel switching circuit, one end of the series-parallel switching circuit is connected with the battery pack to control series connection or parallel connection of the first battery pack 1 and the second battery pack 2, and the other end of the series-parallel switching circuit is connected with the wheel hub motor 10 through a filter capacitor 8 and a three-phase inverter bridge 9 which are sequentially connected in series.
In the above technical scheme, the series-parallel switching circuit includes a first diode 3 and a second diode 4, a cathode of the first diode 3 is connected with a cathode of the first battery pack 1, an anode of the second diode 4 is connected with an anode of the second battery pack 2, a change-over switch 5 is further connected between the cathode of the first diode 3 and the anode of the second diode 4, the anode of the first battery pack 1 and the cathode of the second diode are both connected to a P-end of the three-phase inverter bridge through a positive contactor 6, and the cathode of the second battery pack 2 and the anode of the first diode 4 are both connected to an N-end of the three-phase inverter bridge through a negative contactor 7. Therefore, when the change-over switch is closed, the first battery pack and the second battery pack are connected in series, the output current is unchanged, and the output voltage is increased to twice of the original voltage; when the change-over switch is switched off, the first battery pack and the second battery pack are connected in parallel, the output voltage is unchanged, and the output current is increased by two times.
The power supply system also comprises a vehicle control unit, wherein the signal input end of the vehicle control unit is respectively connected with signals of the opening degree of an accelerator pedal, the opening degree of a brake pedal, the speed of the vehicle and the like; the signal output end of the motor controller is respectively connected with the motor controller and the battery pack controller, the motor controller controls the output rotating speed and the output torque of the hub motor, and the battery pack controller controls the series-parallel switching circuit to realize the series connection or the parallel connection of the two battery packs.
As shown in fig. 2, the control method of the dual-voltage power supply system of the off-road vehicle hub motor comprises the following steps:
1. the vehicle control unit obtains vehicle operation parameters including accelerator pedal opening, brake pedal opening and vehicle speed, and obtains a target rotating speed and a target torque of the hub motor according to the parameters.
2. When the target rotating speed is lower than the rated rotating speed, the vehicle control unit sends an instruction to the battery pack controller, the battery pack controller enables the battery packs to be connected in parallel by controlling the series-parallel connection switching circuit, at the moment, the input voltage of the hub motor is the voltage of a single battery pack, and the input current is twice of the voltage of the single battery pack; when the target rotating speed is greater than or equal to the rated rotating speed, the battery pack controller controls the series-parallel connection switching circuit to enable the battery packs to be connected in series, the input voltage of the hub motor is twice of the voltage of a single battery pack, and the input current is the current of the voltage of the single battery pack.
3. After the series-parallel connection switching of the battery pack, the motor controller controls the output target rotating speed and the target torque of the hub motor by adjusting the frequency of the hub motor. The battery pack is connected in parallel when the vehicle normally runs under the working condition of low rotating speed and large torque, the target rotating speed is less than or equal to the rated rotating speed, the input current of the hub motor is increased to be twice of that of a single battery pack, and the frequency of the hub motor is adjusted to enable the output rotating speed to be equal to the target rotating speed; when the vehicle needs to run at a high speed and a low torque working condition, the target rotating speed is greater than the rated rotating speed, the battery packs are connected in series, the input voltage of the hub motor is increased to be twice of that of a single battery pack, the frequency of the hub motor is adjusted, the output rotating speed can be increased to be twice of that of the hub motor, and the output rotating speed is equal to the target rotating speed.
According to the invention, on the basis of not changing the structure of the hub motor, the input voltage of the hub motor is adjusted through the series-parallel connection switching of the battery pack, so that the output rotating speed and the output torque of the hub motor are controlled, and the switching of a vehicle between a low-rotating-speed large-torque working condition and a high-speed low-torque working condition is realized.

Claims (4)

1. A control method of a dual-voltage power supply system of a wheel hub motor of a cross-country vehicle is characterized by comprising the following steps: the dual-voltage power supply system comprises a battery pack and a hub motor, wherein a series-parallel switching circuit is connected between the battery pack and the hub motor.
2. The off-road vehicle wheel hub motor dual-voltage power supply system control method of claim 1, characterized in that: the vehicle operation parameters include accelerator pedal opening, brake pedal opening and vehicle speed.
3. The off-road vehicle wheel hub motor dual-voltage power supply system control method of claim 1, characterized in that: the battery pack comprises at least two battery packs with equal output voltage and output current.
4. The off-road vehicle wheel hub motor dual-voltage power supply system control method of claim 1, characterized in that: when the target rotating speed is less than or equal to the rated rotating speed, the battery packs are connected in parallel; and when the target rotating speed is greater than the rated rotating speed, the battery packs are connected in series.
CN202010632806.8A 2020-07-01 2020-07-01 Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle Pending CN111703312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010632806.8A CN111703312A (en) 2020-07-01 2020-07-01 Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle

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Application Number Priority Date Filing Date Title
CN202010632806.8A CN111703312A (en) 2020-07-01 2020-07-01 Control method of dual-voltage power supply system of wheel hub motor of off-road vehicle

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CN111703312A true CN111703312A (en) 2020-09-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112428307A (en) * 2020-11-18 2021-03-02 中国船舶重工集团公司第七0七研究所 Flexible power supply system and method for wearable robot

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05236608A (en) * 1992-02-24 1993-09-10 Fuji Electric Co Ltd Main circuit system for electric automobile
DE102014223227A1 (en) * 2014-11-13 2015-05-21 Schaeffler Technologies AG & Co. KG Drive device and method for operating a drive device
CN111211553A (en) * 2020-03-19 2020-05-29 深圳市创耀电子科技有限公司 Double-direct-current power supply series-parallel switching circuit and charging system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05236608A (en) * 1992-02-24 1993-09-10 Fuji Electric Co Ltd Main circuit system for electric automobile
DE102014223227A1 (en) * 2014-11-13 2015-05-21 Schaeffler Technologies AG & Co. KG Drive device and method for operating a drive device
CN111211553A (en) * 2020-03-19 2020-05-29 深圳市创耀电子科技有限公司 Double-direct-current power supply series-parallel switching circuit and charging system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112428307A (en) * 2020-11-18 2021-03-02 中国船舶重工集团公司第七0七研究所 Flexible power supply system and method for wearable robot

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Application publication date: 20200925