CN115091970A - Energy consumption optimization torque distribution control method for double-motor pure electric vehicle - Google Patents
Energy consumption optimization torque distribution control method for double-motor pure electric vehicle Download PDFInfo
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- CN115091970A CN115091970A CN202210773522.XA CN202210773522A CN115091970A CN 115091970 A CN115091970 A CN 115091970A CN 202210773522 A CN202210773522 A CN 202210773522A CN 115091970 A CN115091970 A CN 115091970A
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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
- B60L15/2045—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 for optimising the use of energy
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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
- B60L15/32—Control or regulation of multiple-unit electrically-propelled vehicles
- B60L15/38—Control or regulation of multiple-unit electrically-propelled vehicles with automatic control
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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
- 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
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- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a torque distribution control method for energy consumption optimization of a double-motor pure electric vehicle, which comprises the following steps of: respectively determining speed working condition sections suitable for the two motors to work, and correspondingly marking the two motors as a high-speed working condition motor and a low-speed working condition motor according to the determined speed working condition sections; respectively determining the optimal speed ratio corresponding to the high-speed working condition motor and the low-speed working condition motor based on the energy consumption and dynamic parameters; under the determined optimal speed ratio of the high-speed working condition motor and the low-speed working condition motor, determining the recovery torque distribution proportion of the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process according to the efficiency of the bridge transmission system and the charge-discharge efficiency of the motors under each SOC; and determining the torque distribution proportion born by the high-speed working condition motor and the low-speed working condition motor respectively in the running process of the vehicle according to the optimal speed ratio and the recovery torque distribution proportion.
Description
Technical Field
The invention relates to a method, in particular to a torque distribution control method for energy consumption optimization of a double-motor pure electric vehicle.
Background
With the continuous development of electric vehicles, mileage anxiety also becomes a major pain point of pure electric vehicles. How to achieve the optimal energy consumption under the existing vehicle state becomes a key point for the research and development of pure electric vehicles at the present stage.
In the prior art, the endurance capacity of the electric automobile is improved by equipping a double-motor mode, but for the double-motor electric automobile, a more precise electric control strategy needs to be combined, so that the endurance of the vehicle can be really expanded. Otherwise, even if increased cruising is realized, the power performance of the whole vehicle cannot reach the optimal state, and consumers still feel disappointed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a torque distribution control method for energy consumption optimization of a double-motor pure electric vehicle.
The invention relates to a torque distribution control method for energy consumption optimization of a dual-motor pure electric vehicle, which comprises the following steps of:
step one, respectively determining speed working condition sections suitable for working of two motors, and correspondingly marking the two motors as a high-speed working condition motor and a low-speed working condition motor according to the determined speed working condition sections;
respectively determining the optimal speed ratio corresponding to the high-speed working condition motor and the low-speed working condition motor based on the energy consumption and dynamic parameters;
determining the recovery torque distribution proportion of the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process according to the bridge transmission system efficiency and the charge-discharge efficiency of the motors under the SOC under the determined optimal speed ratio of the high-speed working condition motor and the low-speed working condition motor;
and step four, determining the torque distribution proportion born by the high-speed working condition motor and the low-speed working condition motor respectively in the running process of the vehicle according to the optimal speed ratio and the recovery torque distribution proportion.
In the first step of the energy consumption optimized torque distribution control method for the dual-motor pure electric vehicle, simulation analysis is respectively carried out on the two motors under the low-speed working condition, the medium-speed working condition, the high-speed working condition and the ultra-high-speed working condition so as to obtain the working points of the two motors under the working conditions and the corresponding motor efficiencies MAP.
Further, in the first step, a working point at which the motor efficiency exceeds a set threshold is selected according to the motor efficiency MAP, and the selected working point is marked as a high-efficiency working point.
Further, in the step one, speed working condition sections suitable for the two motors to work are determined according to the distribution of the high-efficiency working points corresponding to the two motors under each working condition.
In the second step of the energy consumption optimized torque distribution control method for the dual-motor pure electric vehicle, the optimal speed ratios corresponding to the high-speed working condition motor and the low-speed working condition motor are respectively determined by utilizing the clamping rule, so that the high-speed working condition motor works corresponding to the high-speed working condition and the low-speed working condition motor works corresponding to the low-speed working condition under the optimal speed ratio.
In the energy consumption optimized torque distribution control method of the double-motor pure electric vehicle, the energy consumption is optimized on the premise of considering both dynamic property and drivability, the service life of the motor is prolonged, the hardware type and arrangement are not required to be changed, and the product development cost is reduced.
Drawings
Fig. 1 is a schematic flow diagram of a torque distribution control method for energy consumption optimization of a dual-motor pure electric vehicle according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
As shown in fig. 1, the energy consumption optimized torque distribution control method for a dual-motor pure electric vehicle according to the present invention is a technical solution with energy consumption optimization effect for torque distribution of each motor in the dual-motor pure electric vehicle, and includes the following steps:
In this step, a simulation tool (for example, using cruise simulation analysis software) is used to perform simulation analysis on the two motors under various conditions (for example, low-speed condition, medium-speed condition, high-speed condition, and ultra-high-speed condition) respectively, so as to obtain the operating points of the motors under various conditions and the corresponding motor efficiency MAP information.
Further, a threshold value of the motor efficiency is preset, the set threshold value is used as a criterion for judging the motor efficiency, and according to each operating point and corresponding motor efficiency MAP information, the operating point corresponding to the motor efficiency higher than the set threshold value in the motor efficiency MAP is selected and marked as a high-efficiency operating point. For example, in the efficiency point distribution diagram of the motor, if an efficiency point having an efficiency of 90% or more accounts for 80%, 90% is used as a threshold value of the motor efficiency, and if the efficiency is greater than 90% when the motor is operated, it can be regarded as efficient operation, and the efficiency point at this time is a high efficiency operation point.
On the basis of the determination of the high-efficiency working points, the speed working condition section suitable for the work of each motor can be determined according to the distribution condition of each high-efficiency working point. For example, under a high-speed condition, if the high-efficiency operating points of one motor are distributed more than that of the other motor, the motor is marked as a high-speed operating motor, and the other motor is a low-speed operating motor. That is, in the set speed working condition section, whether each motor is suitable for the currently set speed working condition section is marked according to the distribution condition of the high-efficiency working points of each motor. If the number of the high-efficiency working points of a certain motor in the current speed working condition section is dominant, the certain motor is marked as a corresponding motor suitable for the current speed working condition, and the speed working condition section suitable for the work of the two motors is determined.
And 102, respectively determining the optimal speed ratio corresponding to the high-speed working condition motor and the low-speed working condition motor based on the energy consumption and dynamic parameters.
In this step, the speed ratio of the determined high-speed condition motor and the determined low-speed condition motor is optimized to determine the optimal speed ratio corresponding to the high-speed condition motor and the low-speed condition motor respectively, so that the high-speed condition motor is more biased to be operated when the vehicle runs at a high speed, and the low-speed condition motor is more biased to be operated when the vehicle runs at a low speed.
In the specific process of determining the optimal speed ratio, the dynamic property of the vehicle needs to be considered at the same time, that is, when speed ratio energy consumption sensitivity analysis is performed, the dynamic property analysis is considered, and the optimal speed ratios corresponding to the high-speed working condition motor and the low-speed working condition motor are respectively determined by utilizing the forcing criterion, so that the high-speed working condition motor works corresponding to the high-speed working condition and the low-speed working condition motor works corresponding to the low-speed working condition under the optimal speed ratio.
And 103, determining the distribution proportion of the recovery torque of the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process according to the efficiency of the bridge transmission system and the charge-discharge efficiency of the motors under the SOC under the determined optimal speed ratio of the high-speed working condition motor and the low-speed working condition motor.
In the step, for the high-speed working condition motor and the low-speed working condition motor of which the optimal speed ratio is determined according to the steps, the recovery torque distribution proportion of the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process is determined based on the charge and discharge efficiency of the motors under different SOCs. Moreover, when the energy recovery capability of the motor under different SOC is considered, the efficiency problem of the electric bridge power train is also considered, and the rough recovery ratio is tried through simulation analysis to determine the distribution basis of the recovery torque.
And step 104, determining the torque distribution proportion born by the high-speed working condition motor and the low-speed working condition motor respectively in the running process of the vehicle according to the optimal speed ratio and the recovery torque distribution proportion.
And further determining the torque distribution proportion born by the high-speed working condition motor and the low-speed working condition motor in the whole running process of the vehicle according to the determined optimal speed ratio and the distribution proportion of the recovered torque born by the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process. Moreover, the determined torque distribution proportion in the whole running process of the vehicle can be further perfected through dynamic tests, economic tests, real vehicle tests and simulation analysis so as to obtain torque distribution data in the optimal energy consumption state.
By adopting the torque distribution control method for energy consumption optimization of the double-motor pure electric automobile, the energy consumption can be optimized on the premise of considering both the dynamic property and the drivability, the service life of the motor is prolonged, the hardware type and the arrangement are not required to be changed, and the product development cost is reduced.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (5)
1. The energy consumption optimized torque distribution control method of the double-motor pure electric vehicle is characterized by comprising the following steps of:
step one, respectively determining speed working condition sections suitable for working of two motors, and correspondingly marking the two motors as a high-speed working condition motor and a low-speed working condition motor according to the determined speed working condition sections;
secondly, respectively determining the optimal speed ratio corresponding to the high-speed working condition motor and the low-speed working condition motor based on the energy consumption and dynamic parameters;
determining the recovery torque distribution proportion of the high-speed working condition motor and the low-speed working condition motor in the vehicle deceleration process according to the bridge transmission system efficiency and the charge-discharge efficiency of the motors under the SOC under the determined optimal speed ratio of the high-speed working condition motor and the low-speed working condition motor;
and step four, determining the torque distribution proportion born by the high-speed working condition motor and the low-speed working condition motor respectively in the running process of the vehicle according to the optimal speed ratio and the recovery torque distribution proportion.
2. The energy consumption optimized torque distribution control method of the dual-motor pure electric vehicle according to claim 1, wherein in the step one, the two motors are respectively subjected to simulation analysis under a low-speed working condition, a medium-speed working condition, a high-speed working condition and a super-high-speed working condition to obtain working points of the two motors under the working conditions and corresponding motor efficiencies MAP.
3. The energy consumption optimized torque distribution control method of the dual-motor pure electric vehicle according to claim 2, wherein in the first step, the operating point with the motor efficiency exceeding the set threshold is selected according to the motor efficiency MAP, and the selected operating point is marked as a high efficiency operating point.
4. The energy consumption optimized torque distribution control method of the dual-motor pure electric vehicle according to claim 3, wherein in the step one, speed working condition sections suitable for the two motors to work are determined according to distribution of high-efficiency working points corresponding to the two motors under each working condition.
5. The energy consumption optimized torque distribution control method for the dual-motor pure electric vehicle as claimed in claim 1, wherein in the second step, the clamping criterion is used to determine the optimal speed ratio corresponding to the high-speed operating condition motor and the low-speed operating condition motor respectively, so that the high-speed operating condition motor works corresponding to the high-speed operating condition and the low-speed operating condition motor works corresponding to the low-speed operating condition under the optimal speed ratio.
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| CN202210773522.XA CN115091970A (en) | 2022-07-01 | 2022-07-01 | Energy consumption optimization torque distribution control method for double-motor pure electric vehicle |
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| CN202210773522.XA CN115091970A (en) | 2022-07-01 | 2022-07-01 | Energy consumption optimization torque distribution control method for double-motor pure electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082300A1 (en) * | 2022-10-21 | 2024-04-25 | 华为技术有限公司 | Energy recovery method, apparatus, device, readable storage medium and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082300A1 (en) * | 2022-10-21 | 2024-04-25 | 华为技术有限公司 | Energy recovery method, apparatus, device, readable storage medium and vehicle |
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