CN113635778A

CN113635778A - Control method and device for driving motor feeding and vehicle

Info

Publication number: CN113635778A
Application number: CN202110808300.2A
Authority: CN
Inventors: 张志军
Original assignee: Beiqi Foton Motor Co Ltd
Current assignee: Beiqi Foton Motor Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2021-11-12
Anticipated expiration: 2041-07-16
Also published as: CN113635778B

Abstract

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

Technical Field

The application relates to the technical field of vehicles, in particular to a control method and device for driving motor feed and a vehicle.

Background

Most new energy vehicles have a feeding function at present, feeding refers to charging by using energy of a motor, and feeding is performed according to maximum feeding torque in order to guarantee feeding efficiency.

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 an over-temperature threshold value, and once the feeding working condition is directly converted into an urgent acceleration working condition or a long slope climbing working condition, 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, a control device and a vehicle for driving motor feed to adopt maximum feed moment of torsion feed under the feed operating mode among the solution correlation technique, the easy overheat trouble that appears when switching into high-power consumption operating mode reduces the power performance of vehicle, user experience relatively poor scheduling problem.

An embodiment of the first aspect of the present application provides a control method for driving motor feed, including the following steps: detecting a current mode of a driving motor of a 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 motor temperature rise value 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 by using the target feeding torque.

Further, the determining a target feeding torque of the driving motor according to the difference between the actual temperature and the maximum 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 is smaller than or equal to the first threshold, 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 a target feeding torque of the driving motor according to the difference between the actual temperature and the maximum allowable temperature includes: if the difference value is larger than the first threshold value, judging whether the difference value is smaller than a second threshold value, wherein the second threshold value 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 a target feeding torque of the driving motor according to the difference between the actual temperature and the maximum allowable temperature includes: and if the difference is larger than or equal to the second threshold, determining a feed torque coefficient according to the current temperature, and taking the product of the feed torque coefficient and the minimum value in the torque corresponding to the rated torque and the rated power of the driving motor as the target feed torque.

Further, the maximum allowable temperature is calculated by the following formula:

Tc＝Tg-Tr，

wherein Tc is the maximum allowable temperature, Tg is the minimum 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: the method comprises the following steps: the detection module is used for detecting the current mode of a driving motor of the vehicle; the system comprises an acquisition module, a power supply module and a control module, wherein the acquisition module is used for acquiring the actual temperature of a 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 an over-temperature fault and a motor temperature rise value under a rapid working condition; and the control module is used for determining the target feeding torque of the driving motor according to the difference value between the actual temperature and the highest allowable temperature and controlling the feeding of the driving motor by using 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 maximum allowable temperature; and the first determining unit is used for detecting the current rotating speed of the vehicle and taking the feeding torque corresponding to the current rotating speed as the target feeding torque when the difference value is smaller than or equal to the first threshold value.

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 maximum allowable temperature; a second determining unit, configured to detect a current rotation speed of the vehicle and obtain a feeding torque corresponding to the current rotation speed when the difference is greater than the first threshold and smaller than the second threshold, and use a minimum value between the feeding torque corresponding to the current rotation speed and a maximum allowable feeding torque of the vehicle as the target feeding torque; and a third determination 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 a product of the feeding torque coefficient and a minimum value of torques corresponding to a rated torque and a rated power of the driving motor as the target feeding torque.

Tc＝Tg-Tr，

An embodiment of a third aspect of the present application provides a vehicle including the control device for feeding a drive motor according to the above embodiment.

Therefore, the embodiment of the application has the following beneficial effects:

the maximum allowable temperature of the feed 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 feed mode is switched to the rapid working condition is still lower than the minimum temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feed 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 feeding is adopted under the feeding working condition in the related technology, the over-temperature fault is easy to occur when the high-power utilization working condition is switched, the power performance of a vehicle is reduced, the user experience is poor and the like are solved.

Additional aspects and advantages of the present 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 present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flowchart 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 driving motor feed according to an embodiment of the present application;

fig. 3 is a block schematic diagram of a control device for driving a motor feed according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In recent years, the requirements on environmental protection and oil consumption are strict year by year, and the new energy automobile can meet the requirements on energy conservation and emission reduction of people, so the new energy automobile is gradually accepted by the public and the market, and the market share is higher and higher. The driving motors are installed on all new energy automobiles, for example, permanent magnet synchronous motors commonly used in the market at present, the motors are high in power density and high in efficiency, but in consideration of the fact that an electric driving system can generate heat in the running process, the accumulated heat cannot be taken away in time, and the motors can easily report over-temperature faults.

The automobile running process has various working conditions such as complex and changeable automobile conditions, starting, rapid acceleration, low-speed climbing, high-speed feedback braking and the like; particularly, the temperature of the motor is fast when the motor is accelerated rapidly and climbs a slope, and the temperature of the motor is reduced under low-torque/low-power working conditions such as low-speed starting, cruising driving and the like.

At present, almost all new energy vehicles have a feeding function, but the influence of the motor temperature on the feeding capacity cannot be considered in a feeding strategy, and the new energy vehicles are fed and operated according to the maximum capacity before the motor reports an over-temperature fault. Under the working condition of high-power feed, the temperature rise of the motor is faster, and once the temperature of the motor is not well controlled, the motor over-temperature fault is likely to be triggered; for example, if the whole vehicle is directly changed from a feeding working condition to a rapid acceleration working condition or a long slope climbing working condition, the motor is easily caused to report an over-temperature fault, so that the dynamic property of the vehicle is reduced, and the driving experience is influenced.

A control method for driving motor feeding, and a vehicle of an embodiment of the present application are described below with reference to the drawings. In the method, the maximum allowable temperature of the feed mode is set as 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 temperature of the motor after the feed mode is switched to the rapid working condition is still lower than the minimum temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feed 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 feeding is adopted under the feeding working condition in the related technology, the over-temperature fault is easy to occur when the high-power utilization working condition is switched, the power performance of a vehicle is reduced, the user experience is poor and the like are solved.

Specifically, fig. 1 is a schematic flowchart 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 the motor feed includes the steps of:

in step S101, the current mode of the drive motor of the vehicle is detected.

It should be noted that the execution subject of the control method for driving the motor to feed power may be a vehicle control unit. The control method for driving motor feeding of the embodiment of the present application may be executed by the control device for driving motor feeding of the embodiment of the present application, and the control for driving motor feeding of the embodiment of the present application may be configured in a vehicle control unit of any vehicle to execute the control method for driving motor feeding of the embodiment of the present application.

The driving motor may include a plurality of operation modes, for example, a feeding mode or various modes such as rapid acceleration, low speed climbing, and high speed climbing. In order to accurately control the feed of the driving motor to avoid triggering over-temperature faults, whether the current mode is the feed mode or not needs to be detected first in the embodiment of the application, so that the driving motor is accurately controlled to feed.

In step S102, when it is detected that the current mode of the driving motor is the feeding mode, the actual temperature of the driving motor is collected, and the maximum allowable temperature of the feeding mode is calculated according to the minimum temperature of the over-temperature fault and the motor temperature rise value under the rapid working condition.

The over-temperature fault is the condition that when the temperature of the driving motor is greater than an over-temperature threshold value, an over-temperature alarm is triggered and the power performance of the vehicle is reduced, so that the vehicle is prevented from being continuously heated. The over-temperature threshold may be specifically calibrated according to the type of the driving motor, and the like, and is not specifically limited.

The rapid working condition refers to a working condition of high-power electricity utilization of the vehicle, such as a rapid acceleration working condition, a high-speed climbing working condition and the like, and the temperature rise value of the driving motor is relatively large at the moment because the driving current of the driving motor is large under the rapid working condition.

In the embodiment of the present application, the maximum allowable temperature is calculated by the following formula:

Tc＝Tg-Tr，

wherein Tc is the highest allowable temperature, Tg is the lowest temperature of an over-temperature fault, and Tr is the motor temperature rise value under a rapid working condition.

It should be noted that the motor temperature rise value under the rapid operating condition may be calibrated in advance, which is not limited specifically.

As a possible calibration method, taking a rapid acceleration condition as an example, the following is specific:

(1) vehicle rapid acceleration calibration: when the whole vehicle is at normal environmental temperature, measuring the motor temperature rise value of the vehicle from 0 to the highest speed under the condition of rapid acceleration, and repeating the test three times, wherein the motor temperature rise value Tr is the average value of the three times. The vehicle can also be calibrated under the condition of full load so as to evaluate the motor temperature rise value when the vehicle is in the most severe working condition.

(2) The drive motor is stabilized to Tc-Tg-Tr temperature calibration: and uniformly selecting 10 rotating speed points in the section from 0 to the highest rotating speed of the driving motor, and testing the continuous torque when the heat balance temperature of the driving motor at each rotating speed point on the rack is Tc.

In step S103, a target feeding torque of the drive motor is determined according to a difference between the actual temperature and the maximum allowable temperature, and the feeding of the drive motor is controlled with the target feeding torque.

It can be understood that, in the embodiment of the present application, the highest allowable temperature of the feed mode is set as the difference between the lowest temperature of the over-temperature fault and the motor temperature rise value under the rapid working condition, so that the motor temperature after the feed mode is switched to the rapid working condition is still lower than the lowest temperature of the over-temperature fault, and thus, on the basis of not increasing hardware, the effective control of the motor temperature in the feed process can be ensured through some appropriate control strategies; when special working conditions are ensured, the motor can meet a requirement of rapid acceleration (the most rigorous working condition of theoretical evaluation), and an overtemperature fault is not triggered in the process.

In some embodiments, determining the target feed torque of the drive motor from the difference between the actual temperature and the maximum allowable temperature comprises: judging whether the difference value is less than or equal to a first threshold value; and if the difference is smaller than or equal to the first threshold, 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 maximum allowable temperature, and the first threshold may be set to a value lower than the maximum allowable temperature, for example, the first threshold may be set to the maximum allowable temperature-2, and may be set according to the requirement of the actual temperature control and the requirement of the feed feedback, which is not particularly limited.

It can be understood that when the difference is less than or equal to the first threshold, it indicates that the current temperature of the driving motor is low, and the feeding may be performed at the maximum feeding torque corresponding to the current rotation speed without performing temperature control, so as to improve the feeding efficiency.

In the embodiment of the application, a relation table between the rotating speed and the feeding torque can be pre-established, and the feeding torque corresponding to the current rotating speed can be obtained through table lookup. It should be noted that, if the current rotation speed is not the calibration point, the current rotation speed is selected according to the maximum value of the feeding torque corresponding to the adjacent rotation speed, so that the driving motor is fed with the current maximum feeding power when the temperature is low, 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 maximum allowable temperature comprises: if the difference value is larger than the first threshold value, judging whether the difference value is smaller than a second threshold value; 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.

The second threshold is determined according to the maximum allowable temperature, and the first threshold may be set to a value higher than the maximum allowable temperature, for example, the second threshold may be set to be the maximum allowable temperature +2, and may be set according to the requirement of the actual temperature control and the requirement of the feed feedback, which is not particularly limited.

It can be understood that when the difference is greater than the first threshold and less than the second threshold, it indicates that the temperature of the driving motor is high, 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 driving motor operates 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 driving motor operates with the maximum allowable feeding torque, so that the situation that the driving motor continues to heat up due to overlarge feeding torque can be effectively avoided, the feeding efficiency is ensured, and meanwhile, the temperature rise requirement that the driving motor cannot meet the rapid working condition due to overhigh temperature is avoided.

It should be noted that, if the current rotation speed is not the calibration point, the current rotation speed is selected according to the minimum value of the feed torque corresponding to the adjacent rotation speed, so that when the temperature of the driving motor is higher, the temperature of the driving motor during feeding is effectively controlled.

In some embodiments, determining the target feed torque of the drive motor from the difference between the actual temperature and the maximum allowable temperature comprises: and if the difference is larger than or equal to a second threshold value, determining a feeding torque coefficient according to the current temperature, and taking the product of the feeding torque coefficient 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 by looking up a table of pre-established current temperature and feeding torque coefficients, or may be set as a fixed coefficient, which is not particularly limited, and may be set to 1/2, for example.

It is understood that when the difference is greater than or equal to the second threshold, indicating that the temperature of the drive motor is too high, the temperature rise value of the drive motor needs to be decreased. Therefore, the embodiment of the application can control the driving motor to operate according to 1/2 rated torque/power of the corresponding rotating speed of the motor when the temperature of the driving motor is too high, so that the temperature rise value of the driving motor is effectively reduced, and the temperature rise requirement that the temperature of the driving motor is too high and cannot meet the rapid working condition is avoided.

According to the control method for driving the motor to feed, the highest allowable temperature of the feed mode is set to be the difference value between the lowest temperature of the over-temperature fault and the motor temperature rise value under the rapid working condition, so that the motor temperature after the feed mode is switched to the rapid working condition is still lower than the lowest temperature of the over-temperature fault, the over-temperature fault can be effectively prevented from being triggered when the feed 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 is described below, and the feeding torque coefficient is 1/2 with the first threshold value being the maximum allowable temperature Tc-2 and the second threshold value being the maximum allowable temperature Tc +2, as shown in fig. 2, the method includes the following steps:

in step S1, after the entire vehicle enters the feeding operation mode, the entire vehicle controller constantly monitors the actual temperature of the driving motor;

in step S2, it is determined whether the actual temperature of the drive motor is less than or equal to Tc-2, and if so, step S3 is executed; if not, go to step S4;

in step S3, the driving motor is controlled to operate according to the feeding strategy of the driving motor, so as to feed back the electric energy to the maximum extent;

in step S4, it is determined whether the actual temperature of the driving motor is equal to or greater than Tc +2, and if so, step S5 is executed; if not, go to step S6;

in step S5, power is fed at the minimum value of the 1/2 rated torque and the 1/2 rated power of the corresponding rotational speed of the motor, for example, power is fed at the 1/2 rated power corresponding torque when the 1/2 rated power corresponding torque is less than 1/2 rated torque;

in step S6, the operation is performed with the temperature Tc: and (4) looking up a table to obtain the continuous torque corresponding to the current rotating speed and the small value of the allowed feedback torque of the whole vehicle to operate (when the rotating speed point is a non-calibration point, selecting according to the small torque value corresponding to two adjacent rotating speeds).

In summary, the embodiment of the application can realize the feed control for preventing the over-temperature of the driving motor without increasing hardware connections such as a sensor, a low-voltage wire harness and the like, thereby flexibly increasing the feed control function on the vehicle, without physical integration and design change and with low cost; the temperature of the motor is effectively controlled in the feeding process; when special working conditions are ensured, the motor can meet the requirement of an urgent acceleration working condition (the most rigorous theoretical evaluation working condition), and the process does not trigger the motor over-temperature fault. Therefore, the problems that the operation temperature of the motor is not considered in a feeding strategy in the related technology and the temperature of the motor is not effectively managed are effectively solved; when the road condition is special, the motor is easy to report over-temperature faults, the dynamic property is reduced, the driving feeling is poor and the like.

Next, a control device for feeding a driving motor according to an embodiment of the present application will be described with reference to the 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: detection module 100, acquisition module 200, and control module 300.

The detection module 100 is used for detecting a current mode of a driving motor of the vehicle; the acquisition module 200 is configured to acquire an actual temperature of the driving motor when the current mode of the driving motor is detected to be the feeding mode, and calculate a maximum allowable temperature of the feeding mode according to a minimum temperature of the over-temperature fault and a motor temperature rise value under a rapid working condition; the control module 300 is configured to determine a target feeding torque of the driving motor according to a difference between the actual temperature and the maximum allowable temperature, and control feeding of the driving motor with the target feeding torque.

Further, the control module 300 includes: the device comprises a first judgment unit, a first determination unit, a second judgment unit, a second determination unit and a third determination unit.

The first judging unit is used for 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;

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 a first threshold value, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque;

the second judging unit is used for judging whether the difference value is smaller than a second threshold value 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 determination unit for determining the feeding torque coefficient according to the current temperature when the difference is greater than or equal to the second threshold, and taking the product of the feeding torque coefficient 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 maximum allowable temperature is calculated by the formula:

Tc＝Tg-Tr，

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 is not repeated herein.

According to the control device for driving motor feed that this application embodiment provided, set up the highest allowable temperature of feed mode into the minimum temperature of excess temperature trouble and the difference of the motor temperature rise value under the operating mode rapidly to make the feed mode switch to the minimum temperature that the motor temperature after the operating mode rapidly is less than the excess temperature trouble still, thereby can effectively avoid triggering the excess temperature trouble when the feed mode switches to the operating mode rapidly, and then can effectively avoid the problem that the merit performance descends because of the excess temperature trouble leads to, promote user's use and experience.

In addition, the embodiment of the application also provides a vehicle, which comprises the control device for feeding the driving motor of the embodiment. This vehicle sets up the maximum allowable temperature of feed mode to the difference of the minimum temperature of excess temperature trouble and the motor temperature rise value under the operating mode rapidly to make the feed mode switch the motor temperature behind the operating mode rapidly still be less than the minimum temperature of excess temperature trouble, thereby can effectively avoid triggering excess temperature trouble when the feed mode switches into the operating mode rapidly, and then can effectively avoid the problem that the merit performance that leads to because of excess temperature trouble descends, promote user's use and experience.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited 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 steps of a custom logic function or process, and alternate 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 implementing the embodiments of the present application.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement 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 diskette (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). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above 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. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A control method for driving a motor feed, characterized by comprising the steps of:

detecting a current mode of a driving motor of a 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 motor temperature rise value under the rapid working condition; and

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 by using the target feeding torque.

2. The method of claim 1, wherein said determining a target feed torque of said drive motor from a difference between said actual temperature and said maximum allowable temperature comprises:

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 is smaller than or equal to the first threshold, detecting the current rotating speed of the vehicle, and taking the feeding torque corresponding to the current rotating speed as the target feeding torque.

3. The method of claim 2, wherein said determining a target feed torque of the drive motor from the difference between the actual temperature and the maximum allowable temperature comprises:

if the difference value is larger than the first threshold value, judging whether the difference value is smaller than a second threshold value, wherein the second threshold value 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.

4. The method of claim 3, wherein said determining a target feed torque of said drive motor from a difference between said actual temperature and said maximum allowable temperature comprises:

and if the difference is larger than or equal to the second threshold, determining a feed torque coefficient according to the current temperature, and taking the product of the feed torque coefficient and the minimum value in the torque corresponding to the rated torque and the rated power of the driving motor as the target feed torque.

5. The method according to any one of claims 1 to 4, wherein the maximum allowable temperature is calculated by the formula:

Tc＝Tg-Tr，

6. A control device for driving a motor feed, comprising:

the detection module is used for detecting the current mode of a driving motor of the vehicle;

the system comprises an acquisition module, a power supply module and a control module, wherein the acquisition module is used for acquiring the actual temperature of a 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 an over-temperature fault and a motor temperature rise value under a rapid working condition; and

and the control module is used for determining the target feeding torque of the driving motor according to the difference value between the actual temperature and the highest allowable temperature and controlling the feeding of the driving motor by using the target feeding torque.

7. The apparatus of claim 6, wherein the control module comprises:

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 maximum allowable temperature;

and the first determining unit is used for detecting the current rotating speed of the vehicle and taking the feeding torque corresponding to the current rotating speed as the target feeding torque when the difference value is smaller than or equal to the first threshold value.

8. The apparatus of claim 7, 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 maximum allowable temperature;

a second determining unit, configured to detect a current rotation speed of the vehicle and obtain a feeding torque corresponding to the current rotation speed when the difference is greater than the first threshold and smaller than the second threshold, and use a minimum value between the feeding torque corresponding to the current rotation speed and a maximum allowable feeding torque of the vehicle as the target feeding torque;

and a third determination 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 a product of the feeding torque coefficient and a minimum value of torques corresponding to a rated torque and a rated power of the driving motor as the target feeding torque.

9. The apparatus according to any one of claims 6 to 8, wherein the maximum allowable temperature is calculated by the formula:

Tc＝Tg-Tr，

10. A vehicle, characterized by comprising a control device for feeding a drive motor according to claims 6-9.