CN113635778B - Control method and device for driving motor feed and vehicle - Google Patents

Control method and device for driving motor feed and vehicle Download PDF

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Publication number
CN113635778B
CN113635778B CN202110808300.2A CN202110808300A CN113635778B CN 113635778 B CN113635778 B CN 113635778B CN 202110808300 A CN202110808300 A CN 202110808300A CN 113635778 B CN113635778 B CN 113635778B
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temperature
feeding
driving motor
torque
difference
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CN113635778A (en
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张志军
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Beiqi Foton Motor Co Ltd
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Beiqi Foton Motor Co Ltd
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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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • 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
    • 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
    • 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
    • B60L2240/425—Temperature
    • 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

Abstract

The application discloses a control method, a device and a vehicle for feeding a driving motor, wherein the method comprises the following steps: detecting a current mode of a driving motor of the vehicle; when the current mode of the driving motor is detected to be a feeding mode, acquiring the actual temperature of the driving motor, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; and determining a target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature, and controlling the feeding of the driving motor according to the target feeding torque. Therefore, the problems that the maximum feeding torque is adopted for feeding under the feeding working condition in the related technology, the over-temperature fault is easy to occur when the feeding working condition is switched into the high-power utilization working condition, the power performance of a vehicle is reduced, the user experience is poor and the like are solved.

Description

Control method and device for driving motor feed and vehicle
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a method and an apparatus for controlling power feeding of a driving motor, and a vehicle.
Background
Most of the current new energy automobiles have a feeding function, and the feeding is to charge by utilizing the energy of a motor, so that the feeding efficiency is ensured, and the feeding is carried out according to the maximum feeding torque.
However, when the vehicle feeds according to the maximum feeding torque, the temperature rise of the motor is accelerated, the temperature of the motor is easy to approach to an over-temperature threshold value, and once the feeding working condition is directly changed into a working condition of rapid acceleration or climbing a long slope, the motor is easy to cause over-temperature faults, so that the power performance of the vehicle is reduced, and the driving experience is reduced.
Disclosure of Invention
The application provides a control method and device for feeding a driving motor and a vehicle, and aims to solve the problems that in the prior art, the feeding is performed under the feeding working condition by adopting the maximum feeding torque, the over-temperature fault is easy to occur when the feeding working condition is switched to the high-power electricity working condition, the power performance of the vehicle is reduced, the user experience is poor and the like.
An embodiment of a first aspect of the present application provides a control method for feeding a driving motor, including the steps of: detecting a current mode of a driving motor of the vehicle; when the current mode of the driving motor is detected to be a feeding mode, acquiring the actual temperature of the driving motor, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; and determining a target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature, and controlling the feeding of the driving motor according to the target feeding torque.
Further, the determining the target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature includes: judging whether the difference value is smaller than or equal to a first threshold value, wherein the first threshold value is determined according to the highest allowable temperature; and if the difference value is smaller than or equal to the first threshold value, detecting the current rotating speed of the vehicle, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.
Further, the determining the target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature includes: if the difference is greater than the first threshold, judging whether the difference is smaller than a second threshold, wherein the second threshold is determined according to the highest allowable temperature; and if the difference value is larger than the first threshold value and smaller than the second threshold value, detecting the current rotating speed of the vehicle, acquiring the feeding torque corresponding to the current rotating speed, and taking the minimum value of the feeding torque corresponding to the current rotating speed and the maximum allowable feeding torque of the vehicle as the target feeding torque.
Further, the determining the target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature includes: and if the difference value is greater than or equal to the second threshold value, determining a feeding torque coefficient according to the current temperature, and taking the product of the feeding torque system and the minimum value in the torque corresponding to the rated torque and the rated power of the driving motor as the target feeding torque.
Further, the calculation formula of the maximum allowable temperature is as follows:
Tc＝Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
An embodiment of the second aspect of the present application provides a control device for driving motor feeding, including: comprising: the detection module is used for detecting the current mode of the driving motor of the vehicle; the acquisition module is used for acquiring the actual temperature of the driving motor when the current mode of the driving motor is detected to be a feeding mode, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; and the control module is used for determining the target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature and controlling the feeding of the driving motor according to the target feeding torque.
Further, the control module includes: a first judging unit, configured to judge whether the difference is smaller than or equal to a first threshold, where the first threshold is determined according to the highest allowable temperature; and the first determining unit is used for detecting the current rotating speed of the vehicle when the difference value is smaller than or equal to the first threshold value, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.
Further, the control module includes: a second judging unit, configured to judge whether the difference is smaller than a second threshold when the difference is larger than the first threshold, where the second threshold is determined according to the highest allowable temperature; a second determining unit, configured to detect a current rotation speed of the vehicle when the difference value is greater than the first threshold value and less than the second threshold value, obtain a feeding torque corresponding to the current rotation speed, and use a minimum value of the feeding torque corresponding to the current rotation speed and the maximum allowable feeding torque of the vehicle as the target feeding torque; and a third determining unit configured to determine a feeding torque coefficient according to the current temperature when the difference is greater than or equal to the second threshold, and take as the target feeding torque a product of the feeding torque system and a minimum value among torques corresponding to rated torque and rated power of the driving motor.
Further, the calculation formula of the maximum allowable temperature is as follows:
Tc＝Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
An embodiment of a third aspect of the present application provides a vehicle, including the control device for driving motor feeding described in the above embodiment.
Therefore, the embodiment of the application has the following beneficial effects:
the maximum allowable temperature of the feeding mode is set to be the difference value between the minimum temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition, so that the temperature of the motor after the feeding mode is switched to the rapid working condition is still smaller than the minimum temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feeding mode is switched to the rapid working condition, the problem of power performance reduction caused by the over-temperature fault can be effectively avoided, and the use experience of a user is improved. Therefore, the problems that the maximum feeding torque is adopted for feeding under the feeding working condition in the related technology, the over-temperature fault is easy to occur when the feeding working condition is switched into the high-power utilization working condition, the power performance of a vehicle is reduced, the user experience is poor and the like are solved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a control method for feeding a driving motor according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a control method for feeding a driving motor according to an embodiment of the present application;
fig. 3 is a block schematic diagram of a control device for driving motor feeding according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
In recent years, environmental protection and oil consumption requirements are strict year by year, and new energy automobiles can meet the requirements of people on energy conservation and emission reduction, so that the new energy automobiles are gradually accepted by masses and markets, and the market share is also higher and higher. All new energy automobiles are provided with driving motors, such as permanent magnet synchronous motors commonly used in the market at present, the motors have high power density and high efficiency, but the accumulated heat cannot be timely taken away in consideration of the heat generated in the operation process of an electric driving system, and the motors are easy to report over-temperature faults.
The automobile has various working conditions such as complex and changeable automobile conditions, starting, rapid acceleration, low-speed climbing, high-speed feedback braking and the like in the running process of the automobile; in particular, the temperature rise of the motor is relatively quick during rapid acceleration and climbing, and the temperature of the motor is generally reduced under low-torque/low-power working conditions such as low-speed starting, cruising and the like.
At present, almost all new energy automobiles have a feeding function, but the influence of the motor temperature on the feeding capacity is not considered in a feeding strategy, and the motor is fed according to the maximum capacity before reporting an overtemperature fault. When the high-power feeding working condition is adopted, the temperature rise of the motor is also faster, and once the temperature of the motor is not well controlled, the motor overtemperature fault is likely to be triggered; for example, if the whole vehicle is directly converted into a working condition of rapid acceleration or climbing a large slope from a feeding working condition, the motor is easy to report an overtemperature fault, so that the dynamic property of the vehicle is reduced, and the driving experience is affected.
A control method for driving motor feeding and a vehicle according to embodiments of the present application are described below with reference to the accompanying drawings. Aiming at the problems that the maximum feeding torque is adopted for feeding under the feeding working condition in the related technology mentioned in the background technology center, over-temperature faults are easy to occur when the feeding working condition is switched to the high-power electricity working condition, the power performance of a vehicle is reduced, the user experience is poor and the like, the application provides a control method for driving motor feeding. Therefore, the problems that the maximum feeding torque is adopted for feeding under the feeding working condition in the related technology, the over-temperature fault is easy to occur when the feeding working condition is switched into the high-power utilization working condition, the power performance of a vehicle is reduced, the user experience is poor and the like are solved.
Specifically, fig. 1 is a schematic flow chart of a control method for feeding a driving motor according to an embodiment of the present application.
As shown in fig. 1, the control method for driving motor feeding includes the steps of:
in step S101, a current mode of a driving motor of a vehicle is detected.
The main body of the control method for feeding the driving motor may be a vehicle controller. The control method for driving motor feeding of the embodiment of the application can be executed by the control device for driving motor feeding of the embodiment of the application, and the control for driving motor feeding of the embodiment of the application can be configured in a whole vehicle controller of any vehicle to execute the control method for driving motor feeding of the embodiment of the application.
The driving motor may include various operation modes, such as a feeding mode or various modes of rapid acceleration, low-speed climbing, high-speed climbing, and the like. In order to accurately control the feeding of the driving motor so as to avoid triggering an over-temperature fault, the embodiment of the application firstly needs to detect whether the current mode is a feeding mode or not so as to accurately control the driving motor to feed.
In step S102, when the current mode of the driving motor is detected as the feeding mode, the actual temperature of the driving motor is collected, and the highest allowable temperature of the feeding mode is calculated according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition.
The over-temperature fault is the condition that when the temperature of the driving motor is larger than an over-temperature threshold value, over-temperature alarm is triggered and the power performance of the vehicle is reduced, so that the continuous temperature rise of the vehicle is avoided. The over-temperature threshold can be specifically calibrated according to the model of the driving motor and the like, and is not specifically limited.
The rapid working condition is the working condition of high-power electricity utilization of the vehicle, such as rapid acceleration, high-speed climbing, and the like, and the driving current of the driving motor is large under the rapid working condition, so that the temperature rise value of the driving motor is relatively large at the moment.
In the embodiment of the application, the calculation formula of the highest allowable temperature is as follows:
Tc＝Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
The motor temperature rise value under the rapid working condition can be calibrated in advance, and the motor temperature rise value is not particularly limited.
As a possible calibration mode, taking a sudden acceleration condition as an example, the following is specific:
(1) Vehicle rapid acceleration calibration: when the whole vehicle is at normal environment temperature, measuring the motor temperature rise value from 0 to the highest speed of the vehicle under the rapid acceleration working condition, repeating the test for three times, and taking the average value of the motor temperature rise value Tr for three times. The vehicle can be calibrated under the condition of full load so as to evaluate the temperature rise value of the motor when the vehicle is in the most severe working condition.
(2) The drive motor stabilized to tc=tg-Tr temperature calibration: and uniformly selecting 10 rotating speed points in the period from 0 to the highest rotating speed of the driving motor, and continuously rotating the driving motor when the heat balance temperature of each rotating speed point tested on the rack is Tc.
In step S103, a target feeding torque of the driving motor is determined according to a difference between the actual temperature and the highest allowable temperature, and the driving motor feeding is controlled with the target feeding torque.
It can be understood that, in the embodiment of the application, the highest allowable temperature of the feeding mode is set as the difference value between the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition, so that the temperature of the motor after the feeding mode is switched to the rapid working condition is still smaller than the lowest temperature of the over-temperature fault, and therefore, the effective control of the temperature of the motor in the feeding process can be ensured through some proper control strategies on the basis of not increasing hardware; when the special working condition is ensured, the motor can meet the requirement of a sudden acceleration (theoretical evaluation of the most severe working condition), and the process does not trigger over-temperature faults.
In some embodiments, determining the target feed torque of the drive motor from the difference between the actual temperature and the highest allowable temperature includes: judging whether the difference value is smaller than or equal to a first threshold value; if the difference is smaller than or equal to the first threshold value, detecting the current rotating speed of the vehicle, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.
The first threshold is determined according to the highest allowable temperature, and the first threshold may be set to a value lower than the highest allowable temperature, for example, the first threshold=the highest allowable temperature-2 may be set, and may be set according to the actual temperature control requirement and the feed feedback requirement, which is not limited specifically.
It can be understood that when the difference value is smaller than or equal to the first threshold value, the current temperature of the driving motor is lower, and the current temperature is not required to be controlled, so that the power can be fed with the maximum power feeding torque corresponding to the current rotating speed, and the power feeding efficiency is improved.
The embodiment of the application can pre-establish a relation table of the rotating speed and the feeding torque, and can obtain the feeding torque corresponding to the current rotating speed through table lookup. If the current rotation speed is not the standard point, the maximum value of the feeding torque corresponding to the adjacent rotation speed is selected, so that the current maximum feeding power is used for feeding when the temperature of the driving motor is lower, and the feeding efficiency is improved.
In some embodiments, determining the target feed torque of the drive motor from the difference between the actual temperature and the highest allowable temperature includes: if the difference is greater than the first threshold, judging whether the difference is less than the second threshold; if the difference value is larger than the first threshold value and smaller than the second threshold value, detecting the current rotating speed of the vehicle, acquiring the feeding torque corresponding to the current rotating speed, and taking the minimum value of the feeding torque corresponding to the current rotating speed and the maximum allowable feeding torque of the vehicle as the target feeding torque.
The second threshold is determined according to the highest allowable temperature, and the threshold may be set to a value higher than the highest allowable temperature, for example, the second threshold=the highest allowable temperature+2 may be set, and may be set according to the actual temperature control requirement and the feed feedback requirement, which is not particularly limited.
It can be understood that when the difference value is greater than the first threshold value and less than the second threshold value, the temperature of the driving motor is higher, and the temperature of the driving motor needs to be controlled. Meanwhile, if the feeding torque corresponding to the current rotating speed is smaller than the maximum allowable feeding torque, the motor is operated with the feeding torque corresponding to the current rotating speed, and if the feeding torque corresponding to the current rotating speed is larger than the maximum allowable feeding torque, the motor is operated with the maximum allowable feeding torque, so that the driving motor is prevented from continuously heating up due to overlarge feeding torque, and the temperature rising requirement of the driving motor, which cannot meet the rapid working condition due to overhigh temperature, is avoided while the feeding efficiency is ensured.
If the current rotation speed is not the standard point, the minimum value of the feeding torque corresponding to the adjacent rotation speed is selected, so that the temperature of the driving motor is effectively controlled when the temperature of the driving motor is higher.
In some embodiments, determining the target feed torque of the drive motor from the difference between the actual temperature and the highest allowable temperature includes: and if the difference value is greater than or equal to the second threshold value, determining a feeding torque coefficient according to the current temperature, and taking the product of the feeding torque system and the minimum value in the torque corresponding to the rated torque and the rated power of the driving motor as the target feeding torque.
The feeding torque coefficient may be determined according to a table of the current temperature and the feeding torque coefficient, which is established in advance, or may be set to be a fixed coefficient, which is not limited in particular, for example, may be set to be 1/2.
It will be appreciated that when the difference is greater than or equal to the second threshold, it is indicated that the temperature of the drive motor is too high, and the temperature rise of the drive motor needs to be reduced. Therefore, when the temperature of the driving motor is too high, the embodiment of the application can control the driving motor to run according to the rated torque/power of 1/2 of the corresponding rotating speed of the motor, so as to effectively reduce the temperature rise value of the driving motor and avoid the situation that the temperature rise requirement of the rapid working condition cannot be met due to the too high temperature of the driving motor.
According to the control method for driving the motor to feed, the maximum allowable temperature of the feeding mode is set to be the difference value between the minimum temperature of the over-temperature fault and the motor temperature rise value under the rapid working condition, so that the motor temperature after the feeding mode is switched to the rapid working condition is still smaller than the minimum temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feeding mode is switched to the rapid working condition, the problem of power performance reduction caused by the over-temperature fault can be effectively avoided, and the use experience of a user is improved.
To further explain the control method for feeding the driving motor, a specific embodiment will be described below, taking the first threshold value=the highest allowable temperature Tc-2, and the second threshold value=the highest allowable temperature tc+2 as an example, and the feeding torque coefficient is 1/2, as shown in fig. 2, and the method includes the following steps:
in step S1, after the whole vehicle enters a feeding working mode, the whole vehicle controller monitors the actual temperature of a driving motor at any time;
in the step S2, judging whether the actual temperature of the driving motor is less than or equal to Tc-2, if so, executing the step S3; if not, executing step S4;
in step S3, the operation of the driving motor is controlled according to the feeding strategy of the driving motor so as to feed back electric energy to the greatest extent;
in the step S4, judging whether the actual temperature of the driving motor is more than or equal to Tc+2, and if so, executing the step S5; if not, executing step S6;
in step S5, feeding is performed at the minimum value of the 1/2 rated torque and the 1/2 rated power of the motor corresponding to the rotational speed, for example, when the 1/2 rated power corresponding torque is smaller than the 1/2 rated torque, feeding is performed at the 1/2 rated power corresponding torque;
in step S6, the holding temperature Tc is operated: the table is searched to obtain the continuous torque corresponding to the current rotating speed and the small value of the feedback torque allowed to run by the whole vehicle (when the rotating speed point is a non-standard point, the small torque value corresponding to the two adjacent rotating speeds is selected).
In summary, the embodiment of the application can realize the feed control for preventing the drive motor from over-temperature without adding hardware connection such as a sensor, a low-voltage wire harness and the like, thereby flexibly adding the feed control function on a vehicle, and having no need of physical integration, low cost and the like; the temperature of the motor is effectively controlled in the feeding process; when the special working condition is ensured, the motor can meet the requirement of a sudden acceleration working condition (the most severe working condition in theoretical evaluation), and the process does not trigger the motor over-temperature fault. Therefore, the problem that the motor operation temperature is not considered in the feeding strategy in the related technology and the motor temperature is not effectively managed is effectively solved; when in special road conditions, the motor is easy to report over-temperature faults, the dynamic performance is reduced, the driving feeling is poor, and the like.
Next, a control device for driving motor feeding according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 3 is a block schematic diagram of a control device for driving motor feeding according to an embodiment of the present application.
As shown in fig. 3, the control device 10 for driving motor feeding includes: the device comprises a detection module 100, an acquisition module 200 and a control module 300.
Wherein the detection module 100 is configured to detect a current mode of a driving motor of the vehicle; the acquisition module 200 is used for acquiring the actual temperature of the driving motor when the current mode of the driving motor is detected to be a feeding mode, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; the control module 300 is used for determining a target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature, and controlling the feeding of the driving motor with the target feeding torque.
Further, the control module 300 includes: the device comprises a first judging unit, a first determining unit, a second judging unit, a second determining unit and a third determining unit.
The first judging unit is used for judging whether the difference value is smaller than or equal to a first threshold value or not, wherein the first threshold value is determined according to the highest allowable temperature;
a first determining unit, configured to detect a current rotation speed of the vehicle when the difference value is less than or equal to a first threshold value, and take a feeding torque corresponding to the current rotation speed as a target feeding torque;
the second judging unit is used for judging whether the difference value is smaller than a second threshold value or not when the difference value is larger than the first threshold value, wherein the second threshold value is determined according to the highest allowable temperature;
the second determining unit is used for detecting the current rotating speed of the vehicle when the difference value is larger than the first threshold value and smaller than the second threshold value, acquiring the feeding torque corresponding to the current rotating speed, and taking the minimum value of the feeding torque corresponding to the current rotating speed and the maximum allowable feeding torque of the vehicle as the target feeding torque;
and a third determining unit for determining a feeding torque coefficient according to the current temperature when the difference is greater than or equal to the second threshold value, and taking the product of the feeding torque system and the minimum value of the rated torque of the driving motor and the torque corresponding to the rated power as the target feeding torque.
Further, the calculation formula of the highest allowable temperature is:
Tc＝Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
It should be noted that the foregoing explanation of the embodiment of the control method for feeding the driving motor is also applicable to the control device for feeding the driving motor of this embodiment, and will not be repeated here.
According to the control device for driving the motor to feed provided by the embodiment of the application, the highest allowable temperature of the feeding mode is set to be the difference value between the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition, so that the temperature of the motor after the feeding mode is switched to the rapid working condition is still smaller than the lowest temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feeding mode is switched to the rapid working condition, the problem of power performance reduction caused by the over-temperature fault can be effectively avoided, and the use experience of a user is improved.
In addition, the embodiment of the application also provides a vehicle, which comprises the control device for driving the motor to feed. The vehicle sets the highest allowable temperature of the feeding mode as the difference value between the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition, so that the temperature of the motor after the feeding mode is switched into the rapid working condition is still smaller than the lowest temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feeding mode is switched into the rapid working condition, the problem of power performance reduction caused by the over-temperature fault can be effectively avoided, and the use experience of a user is improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (8)

1. A control method for driving a motor feed, comprising the steps of:
detecting a current mode of a driving motor of the vehicle;
when the current mode of the driving motor is detected to be a feeding mode, acquiring the actual temperature of the driving motor, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; and
determining a target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature, and controlling the feeding of the driving motor according to the target feeding torque;
the determining the target feeding torque of the driving motor according to the difference between the actual temperature and the highest allowable temperature includes:
judging whether the difference value is smaller than or equal to a first threshold value, wherein the first threshold value is determined according to the highest allowable temperature;
and if the difference value is smaller than or equal to the first threshold value, detecting the current rotating speed of the vehicle, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.
2. The method of claim 1, wherein the determining the target feed torque of the drive motor from the difference between the actual temperature and the maximum allowable temperature comprises:
if the difference is greater than the first threshold, judging whether the difference is smaller than a second threshold, wherein the second threshold is determined according to the highest allowable temperature;
and if the difference value is larger than the first threshold value and smaller than the second threshold value, detecting the current rotating speed of the vehicle, acquiring the feeding torque corresponding to the current rotating speed, and taking the minimum value of the feeding torque corresponding to the current rotating speed and the maximum allowable feeding torque of the vehicle as the target feeding torque.
3. The method according to claim 2, wherein the determining the target feeding torque of the drive motor according to the difference between the actual temperature and the highest allowable temperature includes:
and if the difference value is greater than or equal to the second threshold value, determining a feeding torque coefficient according to the actual temperature, and taking the product of the feeding torque system and the minimum value in the torque corresponding to the rated torque and the rated power of the driving motor as the target feeding torque.
4. A method according to any one of claims 1-3, wherein the calculation formula of the highest allowable temperature is:
Tc=Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
5. A control device for driving a motor feed, comprising:
the detection module is used for detecting the current mode of the driving motor of the vehicle;
the acquisition module is used for acquiring the actual temperature of the driving motor when the current mode of the driving motor is detected to be a feeding mode, and calculating the highest allowable temperature of the feeding mode according to the lowest temperature of the over-temperature fault and the temperature rise value of the motor under the rapid working condition; and
a control module for determining a target feeding torque of the driving motor according to a difference between the actual temperature and the highest allowable temperature, and controlling the driving motor to feed with the target feeding torque;
the control module includes:
a first judging unit, configured to judge whether the difference is smaller than or equal to a first threshold, where the first threshold is determined according to the highest allowable temperature;
and the first determining unit is used for detecting the current rotating speed of the vehicle when the difference value is smaller than or equal to the first threshold value, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.
6. The apparatus of claim 5, wherein the control module comprises:
a second judging unit, configured to judge whether the difference is smaller than a second threshold when the difference is larger than the first threshold, where the second threshold is determined according to the highest allowable temperature;
a second determining unit, configured to detect a current rotation speed of the vehicle when the difference value is greater than the first threshold value and less than the second threshold value, obtain a feeding torque corresponding to the current rotation speed, and use a minimum value of the feeding torque corresponding to the current rotation speed and the maximum allowable feeding torque of the vehicle as the target feeding torque;
and a third determining unit configured to determine a feeding torque coefficient according to the actual temperature when the difference is greater than or equal to the second threshold, and take, as the target feeding torque, a product of the feeding torque system and a minimum value among torques corresponding to rated torques and rated powers of the driving motor.
7. The apparatus of any one of claims 5-6, wherein the calculation formula for the highest allowable temperature is:
Tc=Tg-Tr，
wherein Tc is the highest allowable temperature, tg is the lowest temperature of the over-temperature fault, and Tr is the motor temperature rise value under the rapid working condition.
8. A vehicle comprising a control device for driving a motor feed as claimed in any one of claims 5-7.
CN202110808300.2A 2021-07-16 2021-07-16 Control method and device for driving motor feed and vehicle Active CN113635778B (en)

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