CN115009046B - Calibration strategy for opening degree of accelerator pedal and torque of driving motor of new energy automobile - Google Patents
Calibration strategy for opening degree of accelerator pedal and torque of driving motor of new energy automobile Download PDFInfo
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- CN115009046B CN115009046B CN202210831946.7A CN202210831946A CN115009046B CN 115009046 B CN115009046 B CN 115009046B CN 202210831946 A CN202210831946 A CN 202210831946A CN 115009046 B CN115009046 B CN 115009046B
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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
- 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
- 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
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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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- 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
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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
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a calibration strategy of the opening degree of an accelerator pedal of a new energy automobile and the torque of a driving motor, which comprises the following steps: the accelerator pedal opening of the standard mode is in a direct-proportional linear relation with the relation of the motor torque; the relation between the opening of an accelerator pedal in a low-speed mode and the motor torque is in a proportional curve relation, the motor torque in the low-speed mode in the initial stage is higher than the motor torque in a standard mode, and the motor torque in the low-speed mode in the later stage is lower than the motor torque in the standard mode; and the relationship between the accelerator pedal opening in the medium-high speed mode and the motor torque is in a proportional curve relationship, when the accelerator pedal opening in the medium-high speed mode is from the initial opening to the high-stage opening, the motor torque in the medium-high speed mode is lower than the motor torque in the standard mode, and after the accelerator pedal opening in the medium-high speed mode is from the high-stage opening, the motor torque in the medium-high speed mode is the same as the motor torque in the standard mode. Therefore, the economic performance can be fully and effectively exerted, the energy utilization rate is improved, and the endurance mileage is improved.
Description
Technical Field
The invention relates to the field of new energy automobile manufacturing, in particular to a calibration strategy for opening of an accelerator pedal and torque of a driving motor of a new energy automobile.
Background
The driving modes of the new energy automobile generally comprise a power mode, an economic mode and a common mode, a driver can select the driving modes according to habits or demands, but the manual replacement of the driving modes is inconvenient, particularly dangerous is easy to occur in the driving process, and the driving modes are inconvenient to switch frequently. As shown in fig. 1, when a whole vehicle enterprise engineer performs power calibration, a motor responds to the request torque of the opening degree of an accelerator pedal to perform power mode calibration according to a curve 1, and the method can improve the acceleration performance of a vehicle, and corresponds to larger motor request torque under the same opening degree of the accelerator pedal, so that the whole vehicle economy and the control stability are poor; the economic mode calibration is carried out according to a curve 3, the motor required torque is smaller than the standard mode required torque under the same accelerator pedal opening, the economy of the whole vehicle is outstanding in the mode, the electricity consumption can be reduced, the endurance mileage can be improved, the power performance of the whole vehicle is sacrificed in the mode, and the driving experience and the acceleration requirement are influenced; the ordinary driving mode is calibrated according to the curve 2 standard mode, the calibration strategy has good dynamic property and economy, and is widely applied in practice, but the strategy cannot meet the requirements of drivers on dynamic property and economy.
As shown in fig. 2, the motor external characteristics are divided into a constant torque zone and a constant power zone according to different vehicle speed ranges. In the interval smaller than the rated rotation speed n0, the maximum torque which can be output by the motor is unchanged, and the output power is increased along with the rotation speed of the motor; when the rotating speed of the motor is larger than the rated rotating speed n0, the maximum power output by the motor is unchanged, and the torque is reduced. It follows that the motor efficiency zone is generally around the rotational speed n0, with motor output efficiency decreasing as the rotational speed changes to either side.
Therefore, whether the driving behavior habit of the user is analyzed can be based, when the accelerator pedal is at different openings under different rotating speeds of the driving motor, the whole vehicle controller sends an optimal motor torque command to the motor controller, so that the vehicle runs stably, the economic performance is fully and effectively exerted, the energy utilization rate is improved, the power consumption is reduced, and the cruising mileage of the pure electric logistics vehicle is improved to be a technical problem to be overcome urgently.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a calibration strategy of the opening degree of an accelerator pedal of a new energy automobile and the torque of a driving motor, and after the calibration strategy is used for calibrating, the whole automobile controller can send an optimal motor torque instruction to the motor controller by analyzing the driving behavior habit of a user and under different rotating speeds of the driving motor when the accelerator pedal is at different opening degrees.
In order to achieve the above purpose, the present invention provides a calibration strategy for accelerator pedal opening and driving motor torque of a new energy automobile, which takes accelerator pedal opening as a horizontal axis and motor torque as a vertical axis, wherein the calibration strategy comprises: the accelerator pedal opening of the standard mode is in a direct-proportional linear relation with the relation of the motor torque; the relation between the opening of an accelerator pedal in a low-speed mode and the motor torque is in a proportional curve relation, the motor torque in the low-speed mode in the initial stage is higher than the motor torque in a standard mode, and the motor torque in the low-speed mode in the later stage is lower than the motor torque in the standard mode; and the relationship between the accelerator pedal opening in the medium-high speed mode and the motor torque is in a proportional curve relationship, when the accelerator pedal opening in the medium-high speed mode is from the initial opening to the high-stage opening, the motor torque in the medium-high speed mode is lower than the motor torque in the standard mode, and after the accelerator pedal opening in the medium-high speed mode is from the high-stage opening, the motor torque in the medium-high speed mode is the same as the motor torque in the standard mode.
In a preferred embodiment, the accelerator pedal opening is proportional to the motor speed, and the motor speed in the medium-high speed mode is higher than the motor speed in the low speed mode.
In a preferred embodiment, the low-speed modes include a first low-speed mode, a second low-speed mode, a third low-speed mode, and a fourth low-speed mode, and the motor torque of the first low-speed mode is greater than the motor torque of the second low-speed mode after the initial opening degree of the accelerator pedal opening degree to before the maximum opening degree, the motor torque of the second low-speed mode is greater than the motor torque of the third low-speed mode, and the motor torque of the third low-speed mode is greater than the motor torque of the fourth low-speed mode.
In a preferred embodiment, the medium-high speed modes include a first medium-high speed mode, a second medium-high speed mode, and a third medium-high speed mode, and the motor torque of the first medium-high speed mode is greater than the motor torque of the second medium-high speed mode after the initial opening degree of the accelerator pedal opening degree to before the maximum opening degree, and the motor torque of the second medium-high speed mode is greater than the motor torque of the third medium-high speed mode.
In a preferred embodiment, the motor torque in the first medium-high speed mode, the motor torque in the second medium-high speed mode, and the motor torque in the third medium-high speed mode are the same as the motor torque in the standard mode after the accelerator pedal opening in the medium-high speed mode has been opened from the high-stage opening.
In a preferred embodiment, the high-stage opening of the accelerator pedal opening in the medium-high speed mode is 90% of the maximum opening of the accelerator pedal opening.
In a preferred embodiment, the motor torque in the mid-high mode increases rapidly with increasing accelerator pedal opening when the accelerator pedal opening in the mid-high mode is at a mid-high opening that is 80% -90% of the maximum accelerator pedal opening.
In a preferred embodiment, the new energy vehicle adopts the power mode when the accelerator pedal opening in the medium-high speed mode is at the medium-high opening.
Compared with the prior art, the calibration strategy of the opening degree of the accelerator pedal and the torque of the driving motor of the new energy automobile has the following beneficial effects: the driving motor of the scheme has higher efficiency in a medium-speed region and a high-speed region than in a low-speed region, and has higher efficiency in a medium-torque output region than in a low-torque output region, so that the motor can be prevented from being in a low-efficiency region for a long time by properly improving the torque load coefficient in the region according to the motor torque calibration strategy; the medium rotating speed of the driving motor is the working condition of most automobiles, and at the moment, the large acceleration requirement is not generally generated, and the interval is an important contribution area for reducing the power consumption, so that in the calibration strategy, when the opening of the accelerator pedal is less than 80%, the calibration can be performed according to an economic mode, the output power is reduced, the power consumption of the whole automobile is reduced, and the cruising ability is improved; in a high-speed area of a motor, most of automobiles run at a high speed, the wind resistance of the whole automobile is high, and the power demand is high, but the condition is not frequent in urban logistics distribution, so that the economy is not optimized when the accelerator pedal is in a large opening range; when the accelerator pedal with the middle opening and the small opening is used, the requirement of a driver on low speed or maintaining a certain vehicle speed is reflected, the torque can be calibrated according to an economic mode, and the torque output is properly reduced; when the opening of the accelerator pedal is larger than 80%, if the opening of the accelerator pedal is continuously increased by a driver, the driver indicates that the vehicle is overtaken or has climbing requirements, and the power mode calibration can be adopted.
Drawings
FIG. 1 is a calibration graph of a power mode, an economy mode, and a normal mode according to an embodiment of the prior art;
FIG. 2 is a graphical representation of constant torque and constant power regions for different vehicle speed ranges of motor external characteristics according to one embodiment of the present invention;
FIG. 3 is a graphical calibration schematic of a low speed mode according to one embodiment of the invention;
FIG. 4 is a graphical calibration schematic of a medium and high speed mode according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a power mode in a medium and high speed mode according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 3 to 4, according to a calibration strategy of accelerator pedal opening and driving motor torque of a new energy automobile according to a preferred embodiment of the present invention, the calibration strategy includes: the accelerator pedal opening of the standard mode is in a direct-proportional linear relation with the relation of the motor torque; the relation between the opening of an accelerator pedal in a low-speed mode and the motor torque is in a proportional curve relation, the motor torque in the low-speed mode in the initial stage is higher than the motor torque in a standard mode, and the motor torque in the low-speed mode in the later stage is lower than the motor torque in the standard mode; and the relationship between the accelerator pedal opening in the medium-high speed mode and the motor torque is in a proportional curve relationship, when the accelerator pedal opening in the medium-high speed mode is from the initial opening to the high-stage opening, the motor torque in the medium-high speed mode is lower than the motor torque in the standard mode, and after the accelerator pedal opening in the medium-high speed mode is from the high-stage opening, the motor torque in the medium-high speed mode is the same as the motor torque in the standard mode.
In some embodiments, the accelerator pedal opening is proportional to the motor speed, and the motor speed in the medium-high speed mode is higher than the motor speed in the low speed mode.
In some embodiments, the low-speed modes include a first low-speed mode, a second low-speed mode, a third low-speed mode, and a fourth low-speed mode, and the motor torque of the first low-speed mode is greater than the motor torque of the second low-speed mode after an initial opening degree of an accelerator pedal opening degree to before a maximum opening degree, the motor torque of the second low-speed mode is greater than the motor torque of the third low-speed mode, and the motor torque of the third low-speed mode is greater than the motor torque of the fourth low-speed mode.
In some embodiments, the medium-high speed modes include a first medium-high speed mode, a second medium-high speed mode, and a third medium-high speed mode, and the motor torque of the first medium-high speed mode is greater than the motor torque of the second medium-high speed mode after an initial opening of the accelerator pedal opening to before a maximum opening, the motor torque of the second medium-high speed mode being greater than the motor torque of the third medium-high speed mode.
In some embodiments, the accelerator pedal opening in the medium-high speed mode is the same as the motor torque in the standard mode after the high-end opening, the motor torque in the first medium-high speed mode, the motor torque in the second medium-high speed mode, and the motor torque in the third medium-high speed mode.
In some embodiments, the high-phase opening of the accelerator pedal opening in the medium-high speed mode is 90% of the maximum opening of the accelerator pedal opening.
In some embodiments, the motor torque in the mid-high mode increases rapidly with increasing accelerator pedal opening when the accelerator pedal opening in the mid-high mode is at a mid-high opening that is 80% -90% of the maximum accelerator pedal opening.
In some embodiments, the new energy vehicle adopts the power mode when the accelerator pedal opening in the medium and high speed mode is at the medium and high opening.
Referring to fig. 3 to 4, in some embodiments, in the calibration strategy of the present invention (taking a new energy logistics light truck as an example, but the present invention is not limited to the same once), the S0 curve is a calibration strategy of a standard mode, and in the standard mode, no matter whether the motor is in a constant torque area or a constant power area, the motor torque is output in proportion only according to the pedal opening change regardless of the motor rotation speed. Motor speed S1< S2< S3< S4< S5< S6< S7. Wherein each of the rotational speeds S1, S2, S3, S4 of fig. 3 is a low speed mode, from a first low speed mode to a fourth low speed mode, and is all within a calibration strategy in a constant torque zone. The rotation speeds S5, S6, S7 in fig. 4 are the calibration strategies of the medium-high speed modes, i.e. the first medium-high speed mode to the third medium-high speed mode, in the constant power region.
Referring to fig. 3, in some embodiments, when the accelerator pedal is in a smaller opening range, in order to meet the starting acceleration requirement of the automobile, a larger torque response is required, and the lower the motor speed, the larger the torque load coefficient is, and the larger the corresponding output torque is under the condition of the same pedal opening; this interval demand torque is above the power mode torque.
Referring to FIG. 4, in some embodiments, as vehicle speed increases to medium and high speeds, a small change in accelerator pedal opening indicates that the driver does not need a large deceleration request, the motor output torque is reduced after calibration according to FIG. 4, and the vehicle is in an economy mode.
As shown in fig. 5, in some embodiments, the logistics vehicle is operated under a stable vehicle speed most of the time, and the operation of the accelerator pedal by low, medium and high speed driving is mostly in a medium opening range. Aiming at the working condition that the speed is increased to a certain stable vehicle speed and the accelerator pedal is in the middle opening range, the calibrated motor torque T is concentrated in change, the motor torque T does not need to be greatly increased or decreased, and the habit of stable driving of the logistics vehicle is met. For the situation that the accelerator pedal is in the middle opening range no matter in low, medium and high speeds, the requirement of a driver on the vehicle speed acceleration performance is lower, the calibrated motor torque is in an economic mode, and the torque load coefficient is smaller when the speed is larger.
In some embodiments, the driving motor is higher in efficiency in the middle and high speed areas than in the low speed area, and higher in efficiency in the middle torque output area than in the low torque output area, so that the motor is prevented from being in the low efficiency area for a long time by properly increasing the torque load coefficient in the middle by the motor torque calibration strategy; the medium rotating speed of the driving motor is the working condition of most automobiles, and at the moment, the large acceleration requirement is not generally generated, and the interval is an important contribution area for reducing the power consumption, so that in the calibration strategy, when the opening of the accelerator pedal is less than 80%, the calibration can be performed according to an economic mode, the output power is reduced, the power consumption of the whole automobile is reduced, and the cruising ability is improved; in a high-speed area of a motor, most of automobiles run at a high speed, the wind resistance of the whole automobile is high, and the power demand is high, but the condition is not frequent in urban logistics distribution, so that the economy is not optimized when the accelerator pedal is in a large opening range; when the accelerator pedal with the middle opening and the small opening is used, the requirement of a driver on low speed or maintaining a certain vehicle speed is reflected, the torque can be calibrated according to an economic mode, and the torque output is properly reduced; when the opening of the accelerator pedal is larger than 80%, if the opening of the accelerator pedal is continuously increased by a driver, the driver indicates that the vehicle is overtaken or has climbing requirements, and the power mode calibration can be adopted.
In summary, the calibration strategy of the opening degree of the accelerator pedal and the torque of the driving motor of the new energy automobile has the following advantages: based on analysis of driving behavior habits of users, when the accelerator pedal is at different opening degrees under different rotation speeds of the driving motor, the whole vehicle controller sends an optimal motor torque command to the motor controller, and after the calibration strategy is optimized, the vehicle can run stably, the economic performance is fully and effectively exerted, the energy utilization rate is improved, the power consumption is reduced, and the endurance mileage of the pure electric logistics vehicle is improved.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (2)
1. The utility model provides a calibration strategy of new energy automobile accelerator pedal aperture and driving motor torque, its use accelerator pedal aperture as the cross axle, use motor torque as vertical axis, its characterized in that, the calibration strategy includes:
A standard mode, wherein the relation between the opening of an accelerator pedal and the torque of a motor is in a direct-proportional linear relation;
The low-speed mode is characterized in that the relation between the opening of an accelerator pedal and the motor torque is in a proportional curve relation, the motor torque of the low-speed mode in the initial stage is higher than that of the motor in the standard mode, and the motor torque of the low-speed mode in the later stage is lower than that of the motor in the standard mode; and
A middle-high speed mode, wherein the relation between the accelerator pedal opening and the motor torque is in a proportional curve relation, when the accelerator pedal opening of the middle-high speed mode is from an initial opening to a high-period opening, the motor torque of the middle-high speed mode is lower than the motor torque of the standard mode, and after the accelerator pedal opening of the middle-high speed mode is from the high-period opening, the motor torque of the middle-high speed mode is the same as the motor torque of the standard mode;
Wherein the low-speed modes include a first low-speed mode, a second low-speed mode, a third low-speed mode, and a fourth low-speed mode, and after an initial opening of an accelerator pedal opening to before a maximum opening, a motor torque of the first low-speed mode is greater than a motor torque of the second low-speed mode, a motor torque of the second low-speed mode is greater than a motor torque of the third low-speed mode, and a motor torque of the third low-speed mode is greater than a motor torque of the fourth low-speed mode;
The middle and high speed modes comprise a first middle and high speed mode, a second middle and high speed mode and a third middle and high speed mode, wherein after the initial opening of the accelerator pedal opening to before the maximum opening, the motor torque of the first middle and high speed mode is larger than the motor torque of the second middle and high speed mode, and the motor torque of the second middle and high speed mode is larger than the motor torque of the third middle and high speed mode;
After the accelerator pedal opening in the middle-high speed mode is from the high-stage opening, the motor torque in the first middle-high speed mode, the motor torque in the second middle-high speed mode and the motor torque in the third middle-high speed mode are all the same as the motor torque in the standard mode;
wherein the high-stage opening of the accelerator pedal opening in the medium-high speed mode is 90% of the maximum opening of the accelerator pedal opening;
And when the accelerator pedal opening in the medium-high speed mode is in a medium-high opening which is 80% -90% of the maximum accelerator pedal opening, the motor torque in the medium-high speed mode is rapidly increased along with the increase of the accelerator pedal opening.
2. The calibration strategy of the accelerator pedal opening and the driving motor torque of the new energy automobile according to claim 1, wherein the accelerator pedal opening is in a direct proportion to the motor speed, and the motor speed in the medium-high speed mode is higher than the motor speed in the low speed mode.
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| CN114312341A (en) * | 2020-09-30 | 2022-04-12 | 比亚迪股份有限公司 | Electric vehicle and energy-saving control method and device thereof |
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