CN114261284A - Fault control method and device for electric drive system, vehicle and storage medium - Google Patents
Fault control method and device for electric drive system, vehicle and storage medium Download PDFInfo
- Publication number
- CN114261284A CN114261284A CN202111561589.9A CN202111561589A CN114261284A CN 114261284 A CN114261284 A CN 114261284A CN 202111561589 A CN202111561589 A CN 202111561589A CN 114261284 A CN114261284 A CN 114261284A
- Authority
- CN
- China
- Prior art keywords
- bridge arm
- current
- phase
- controlling
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The application relates to the technical field of vehicles, in particular to a fault control method and device of an electric drive system, a vehicle and a storage medium, wherein the electric drive system comprises a drive motor and a motor controller, and the method comprises the following steps: when the fault of the electric drive system is detected, acquiring the current rotating speed of a drive motor; judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value or not; and if the current rotating speed is less than or equal to the rotating speed threshold, controlling the three-phase upper bridge arm and the three-phase lower bridge arm to be simultaneously switched off, otherwise, controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously switched on so as to enter a short-circuit state, and controlling the bridge arms entering the short-circuit state to be simultaneously switched off when the current rotating speed is reduced to be less than or equal to the rotating speed threshold. Therefore, the problems that in the prior art, when the electric drive system fails, the power device is directly cut off, once the braking torque is too large, the rapid deceleration situation is easy to occur, the safety of the vehicle is greatly reduced, and the like are solved.
Description
Technical Field
The present disclosure relates to the field of vehicle technologies, and in particular, to a method and an apparatus for controlling a fault of an electric drive system, a vehicle, and a storage medium.
Background
The electric drive system is a drive system commonly used in new energy vehicles, and for a new energy vehicle equipped with the electric drive system, abnormal acceleration and deceleration are likely to occur when the electric drive system fails, so that failure control of the electric drive system is particularly important in order to avoid a vehicle safety problem caused by a failure of the electric drive system.
In the related art, it is common to directly cut off the power device when the electric drive system fails to perform the fault control of the electric drive system by inhibiting the torque output. However, in the related art, when the electric drive system fails, the power device is directly turned off, and if the braking torque is too large, a rapid deceleration is likely to occur, which greatly reduces the safety of the vehicle.
Disclosure of Invention
The application provides a fault control method and device of an electric drive system, a vehicle and a storage medium, which aim to solve the problems that in the related art, when the electric drive system has a fault, a power device is directly cut off, the rapid deceleration situation is easy to occur, the safety of the vehicle is reduced, and the like.
An embodiment of a first aspect of the present application provides a fault control method for an electric drive system, where the electric drive system includes a drive motor and a motor controller, where the motor controller includes a three-phase upper bridge arm and a three-phase lower bridge arm, and the method includes the following steps:
when the electric drive system fault is detected, acquiring the current rotating speed of the drive motor;
judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value or not;
and if the current rotating speed is less than or equal to the rotating speed threshold, controlling the three-phase upper bridge arm and the three-phase lower bridge arm to be simultaneously turned off, otherwise, controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously turned on so as to enter a short-circuit state, and controlling the bridge arm entering the short-circuit state to be simultaneously turned off when the current rotating speed is reduced by less than or equal to the rotating speed threshold.
Further, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state includes:
controlling the three-phase upper bridge arm to be turned off at the same time, controlling the three-phase lower bridge arm to be turned on at the same time, and applying a first preset duty ratio on the three-phase lower bridge arm;
detecting the current phase current of the three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value;
and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
Further, controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state includes:
controlling the three-phase lower bridge arm to be turned off at the same time, controlling the three-phase upper bridge arm to be turned on at the same time, and applying a first preset duty ratio to the three-phase upper bridge arm;
detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value;
and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
Further, before controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously conducted and enter a short-circuit state, the method further includes:
judging whether the fault of the electric drive system is a fault of a motor controller, wherein the fault of the motor controller comprises a three-phase upper bridge arm fault and a three-phase lower bridge arm fault;
if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state;
and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
An embodiment of a second aspect of the present application provides a fault protection device for an electric drive system, where the electric drive system includes a drive motor and a motor controller, and the motor controller includes a three-phase upper bridge arm and a three-phase lower bridge arm, and includes:
the acquisition module is used for acquiring the current rotating speed of the driving motor when the electric driving system fault is detected;
the judging module is used for judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value or not; and
and the control module is used for controlling the three-phase upper bridge arm and the three-phase lower bridge arm to be simultaneously turned off if the current rotating speed is less than or equal to the rotating speed threshold, otherwise, controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously turned on to enter a short-circuit state, and controlling the bridge arm which enters the short-circuit state to be simultaneously turned off when the current rotating speed is reduced to be less than the rotating speed threshold.
The control module is further used for controlling the three-phase upper bridge arm to be turned off at the same time, controlling the three-phase lower bridge arm to be turned on at the same time, and applying a first preset duty ratio to the three-phase lower bridge arm; detecting the current phase current of the three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
The control module is further used for controlling the three-phase lower bridge arms to be turned off at the same time, controlling the three-phase upper bridge arms to be turned on at the same time, and applying a first preset duty ratio to the three-phase upper bridge arms; detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
The control module is further configured to determine whether a fault of the electric drive system is a fault of the motor controller before controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously conducted to enter a short-circuit state, where the fault of the motor controller includes a fault of the three-phase upper bridge arm and a fault of the three-phase lower bridge arm; if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state; and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
An embodiment of a third aspect of the present application provides a vehicle, comprising: the fault control system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the fault control method of the electric drive system.
A fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, the program being executed by a processor for implementing the fault control method of the electric drive system described above.
Therefore, the application has at least the following beneficial effects:
different fault control strategies are selected according to the rotating speed of the driving motor, the power device can be directly cut off when the rotating speed is low, and the power device is cut off after the rotating speed is reduced through active short circuit of the electric driving system when the rotating speed is high, so that the rapid speed reduction condition is avoided when the power device of the electric driving system is cut off, and the safety of a vehicle is improved. Therefore, the problems that in the prior art, when an electric drive system fails, a power device is directly cut off, a rapid speed reduction situation is easy to occur, the safety of a vehicle is reduced 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 fault control method of an electric drive system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a power device of a motor controller provided according to an embodiment of the present application;
fig. 3 is a schematic flow chart of active short circuit control according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an electric drive system according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a motor controller fault protection process provided in accordance with an embodiment of the present application;
FIG. 6 is a block schematic diagram of a fault control device of an electric drive system provided in accordance with an embodiment of the present application;
fig. 7 is a schematic structural diagram of a vehicle 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.
On the new energy automobile, the electric drive system is a power source of the new energy automobile and is used for driving the new energy automobile to run. The reliability of the electric drive system is of particular importance. When the electric drive system breaks down, the electric drive system needs to be controlled to enter a safe state so as to avoid abnormal acceleration and deceleration of the whole vehicle and harm the safety of drivers and passengers and passersby.
In the related art, it is common to directly cut off the power device when the electric drive system fails to perform the fault control of the electric drive system by inhibiting the torque output. However, in the related art, when the electric drive system fails, the power device is directly turned off, and if the braking torque is too large, a rapid deceleration is likely to occur, which greatly reduces the safety of the vehicle. In order to solve the above problems, embodiments of the present application provide a fault protection method for a motor controller, so as to improve the safety of an electric drive system and protect the electric drive system and personal safety.
A failure control method and apparatus of an electric drive system, a vehicle, and a storage medium of the embodiments of the present application are described below with reference to the drawings. In the method, different fault control strategies are selected according to the rotating speed of a driving motor, the power device can be directly cut off when the rotating speed is low, the power device is cut off after the rotating speed is reduced through active short circuit of the electric driving system when the rotating speed is high, the rapid speed reduction condition is avoided when the power device of the electric driving system is cut off, and the safety of a vehicle is improved. Therefore, the problems that in the prior art, when an electric drive system fails, a power device is directly cut off, a rapid speed reduction situation is easy to occur, the safety of a vehicle is reduced and the like are solved.
Specifically, fig. 1 is a schematic flowchart of a fault control method of an electric drive system according to an embodiment of the present disclosure. The electric drive system includes a drive motor and a motor controller, the motor controller includes a three-phase upper bridge arm and a three-phase lower bridge arm, the following embodiment will be explained by taking the motor controller shown in fig. 2 as an example, S1、S3、S5Is a three-phase upper bridge arm S2、S4、S6The three-phase lower bridge arm is connected to the driving motor in three phases, and the switching tubes of the three-phase upper bridge arm and the three-phase lower bridge arm are, for example, but not limited to, IGBTs (Insulated Gate Bipolar transistors).
As shown in fig. 1, the fault control method of the electric drive system includes the steps of:
in step S101, when a fault of the electric drive system is detected, the current rotation speed of the drive motor is acquired.
The electric drive system fault may include a motor fault, a controller fault, and the like.
It can be understood that, since the embodiment of the present application may select different fault control strategies according to the rotation speed of the driving motor, when a fault of the electric drive system is detected, it is necessary to first acquire the current rotation speed of the driving motor for determining the subsequent control strategy.
In this embodiment, the present application embodiment may acquire the current rotation speed in various manners, such as a rotation speed sensor, which is not limited in this respect.
In this embodiment, before acquiring the current rotation speed of the driving motor, the embodiment of the present application further includes: and judging whether the fault of the electric drive system is a serious fault or not, and acquiring the current rotating speed if the electric drive system has the serious fault.
In step S102, it is determined whether the current rotation speed of the drive motor is greater than a rotation speed threshold.
The rotation speed threshold may be set or calibrated according to actual conditions, which is not particularly limited.
In step S103, if the current rotation speed is less than or equal to the rotation speed threshold, the three-phase upper bridge arm and the three-phase lower bridge arm are controlled to be turned off at the same time, otherwise, the three-phase upper bridge arm or the three-phase lower bridge arm is controlled to be turned on at the same time to enter a short-circuit state, and when the current rotation speed is less than or equal to the rotation speed threshold, the bridge arm that enters the short-circuit state is controlled to be turned off at the same time.
The lower bridge arm or the upper bridge arm of the three-phase bridge can be controlled to be conducted at the same time, so that three-phase active short circuit of the motor stator winding is achieved.
It can be understood that different fault control strategies can be selected according to the rotating speed when the electric drive system is in fault, and because the corresponding braking torque is too large when the rotating speed is large, a rapid speed reduction situation is easily generated, and the safety of the vehicle is greatly reduced, the electric drive system can be controlled to enter an active short circuit state when the rotating speed is large, the power device is cut off after the rotating speed is reduced, the rapid speed reduction situation generated by too large braking torque is avoided, and the safety of the vehicle is improved; because the corresponding braking torque is smaller when the rotating speed is smaller, and the rapid deceleration condition is not easy to generate, the embodiment of the application can directly control the power device to be turned off when the rotating speed is smaller, can eliminate the fault of the electric drive system as soon as possible without generating the rapid deceleration condition, and improves the safety of the vehicle.
In this embodiment, the active short-circuit control mode may include a three-phase upper bridge arm active short-circuit mode and a three-phase lower bridge arm active short-circuit mode, and in a specific application, a person skilled in the art may select different active short-circuit control modes according to an actual situation, which is not specifically limited in this respect. The following explains the three-phase upper bridge arm active short circuit control mode and the three-phase lower bridge arm active short circuit control mode respectively, specifically as follows:
in this embodiment, the three-phase lower bridge arm is turned on at the same time to enter the short-circuit state, including: controlling the three-phase upper bridge arm to be turned off at the same time, controlling the three-phase lower bridge arm to be turned on at the same time, and applying a first preset duty ratio to the three-phase lower bridge arm; detecting the current phase current of a three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current phase is smaller than the current threshold, increasing the first preset duty ratio by preset step length when the first preset duty ratio is smaller than the second preset duty ratio.
The first preset duty cycle, the current threshold, the second preset duty cycle and the preset step length may be specifically set or calibrated according to actual conditions, which is not specifically limited.
It can be understood that in the process of controlling the conduction of the power device, the embodiment of the application can synchronously apply the PWM waves with adjustable duty ratios on the conducted bridge arms by combining the sizes of the short-circuit currents at different rotating speeds, so that the short-circuit current can be effectively controlled through the variable PWM duty ratios in the active short-circuit state, and the electric drive system is prevented from being damaged by the overlarge short-circuit current.
The following explains a specific example that the lower bridge arms of the phases are simultaneously conducted to enter a short-circuit state, where the second preset duty ratio is 0.95 as an example, and the preset step length is 0.05 as an example, and specifically, as shown in fig. 3, the method includes the following steps:
step 11, controlling the three-phase upper bridge arms S1, S3 and S5 to be turned off;
step 12, simultaneously setting the duty ratios of the three-phase lower bridge arms S2, S4 and S6 as a first preset duty ratio D;
step 13, if the phase current is smaller than the current threshold I, executing step 14; otherwise, executing step 16;
step 14, if the duty ratio D is less than 0.95, executing step 15; otherwise, executing step 16;
step 15, increasing the first preset duty ratio D by a step size of 0.05;
step 16, if the rotating speed of the motor is greater than or equal to the rotating speed threshold value, executing step 13; and when the rotating speed of the motor is less than the rotating speed threshold value, the motor controller quits the active short-circuit control.
In this embodiment, controlling the three-phase upper bridge arm to be simultaneously conducted to enter the short-circuit state includes: controlling the three-phase lower bridge arm to be turned off at the same time, controlling the three-phase upper bridge arm to be turned on at the same time, and applying a first preset duty ratio to the three-phase upper bridge arm; detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current phase is smaller than the current threshold, increasing the first preset duty ratio by preset step length when the first preset duty ratio is smaller than the second preset duty ratio.
It can be understood that the principle of the three-phase upper bridge arm active short circuit mode is the same as that of the three-phase lower bridge arm active short circuit mode, and the explanation of the three-phase upper bridge arm active short circuit mode can refer to the explanation of the three-phase lower bridge arm active short circuit mode, and is not repeated to avoid redundancy.
In this embodiment, before controlling the three-phase upper arm or the three-phase lower arm to be simultaneously turned on and enter the short-circuit state, the method further includes: judging whether the fault of the electric drive system is a fault of a motor controller, wherein the fault of the motor controller comprises a three-phase upper bridge arm fault and a three-phase lower bridge arm fault; if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state; and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
It can be understood that if any one phase lower bridge arm fails, the three-phase upper bridge arm is controlled to be completely conducted, the three-phase lower bridge arm is completely closed, and the upper bridge arm enters an active short circuit state; if any phase upper bridge arm fails, the three-phase upper bridge arms are controlled to be completely closed, the three-phase lower bridge arms are completely conducted, and the lower bridge arms enter an active short-circuit state, so that a corresponding control mode can be selected according to the failure occurrence position before the motor controller is controlled to enter the short-circuit state, and the control reliability is improved.
A method for controlling a fault of an electric drive system is described below with a specific embodiment, where the electric drive system takes the structure shown in fig. 4 as an example, as shown in fig. 4, the electric drive system includes a motor controller, a motor, a power battery, a high-voltage bus, three phase lines of the motor, and the like, where the motor controller mainly includes a main control chip, a detection circuit, a drive circuit, and the like, and the motor controller includes six switching tubes to form a three-phase bridge circuit, which respectively controls the on and off of three phases of the motor. Specifically, as shown in fig. 5, the fault control method of the electric drive system includes the steps of:
step 21, electrifying the key of the whole vehicle, and initializing a motor controller;
step 22, the motor controller executes other code segments;
step 23, when the motor controller detects that a serious fault occurs in the electric drive system, the step 24 is carried out; if no fault occurs, go to step 28;
step 24, the motor controller judges whether the current motor rotating speed is greater than a rotating speed threshold value N1, if so, the step 25 is carried out; if not, go to step 27;
step 25, the motor controller judges whether the fault reported in the step 23 is a fault of a lower bridge arm of any one of three phases, and if so, the upper bridge arm is controlled to enter an active short-circuit state; if not, controlling the lower bridge arm to carry out an active short circuit state;
step 26, the motor controller judges whether the current motor rotating speed is greater than a rotating speed threshold value N2, if so, the step 24 is carried out; if not, go to step 27;
step 27, directly turning off the power device by the motor controller, wherein turning off the power device means turning off the six power devices to enable all three-phase upper and lower bridge arms to be in a turn-off state;
in step 28, the process ends.
According to the fault control method of the electric drive system, different fault control strategies are selected according to the rotating speed of the drive motor, the power device can be directly cut off when the rotating speed is low, and the power device is cut off after the electric drive system is actively controlled to be in short circuit and reduce the rotating speed when the rotating speed is high, so that the rapid speed reduction condition is avoided when the power device of the electric drive system is cut off, and the safety of a vehicle is improved; and under the active short-circuit working condition, the short-circuit current is effectively controlled through the variable PWM duty ratio, and the electric drive system is prevented from being damaged due to the fact that the short-circuit current is too large.
Next, a fault control device of an electric drive system proposed according to an embodiment of the present application is described with reference to the drawings.
Fig. 6 is a block schematic diagram of a fault control device of an electric drive system according to an embodiment of the present application.
As shown in fig. 6, the failure control device 10 of the electric drive system includes: the device comprises an acquisition module 100, a judgment module 200 and a control module 300.
The acquiring module 100 is configured to acquire a current rotation speed of the driving motor when a fault of the electric driving system is detected; the judging module 200 is used for judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value; and the control module 300 is configured to control the three-phase upper bridge arm and the three-phase lower bridge arm to be turned off simultaneously if the current rotation speed is less than or equal to the rotation speed threshold, otherwise, control the three-phase upper bridge arm or the three-phase lower bridge arm to be turned on simultaneously to enter a short-circuit state, and control the bridge arm entering the short-circuit state to be turned off simultaneously when the current rotation speed is reduced to be less than the rotation speed threshold.
Further, the control module 300 is further configured to control the three-phase upper bridge arm to be turned off at the same time, control the three-phase lower bridge arm to be turned on at the same time, and apply a first preset duty ratio to the three-phase lower bridge arm; detecting the current phase current of a three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current phase is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than the second preset duty ratio.
Further, the control module 300 is further configured to control the three-phase lower bridge arm to be turned off at the same time, control the three-phase upper bridge arm to be turned on at the same time, and apply a first preset duty ratio to the three-phase upper bridge arm; detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current phase is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than the second preset duty ratio.
Further, the control module 300 is further configured to determine whether the fault of the electric drive system is a fault of the motor controller before controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously conducted to enter the short-circuit state, where the fault of the motor controller includes a fault of the three-phase upper bridge arm and a fault of the three-phase lower bridge arm; if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state; and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
It should be noted that the foregoing explanation of the embodiment of the fault control method of the electric drive system is also applicable to the fault control device of the electric drive system of this embodiment, and is not repeated here.
According to the fault control device of the electric drive system, after the electric drive system is detected to be in fault, a proper fault protection method can be selected according to the rotating speed of the motor, so that the rapid speed reduction condition when a power device of the electric drive system is cut off is avoided, and the safety of a vehicle is improved; under the working condition of active short circuit, the short-circuit current can be effectively controlled through the variable PWM duty ratio, and the electric drive system is prevented from being damaged.
Fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle may include: memory 701, processor 702, and communications interface 703.
The processor 702, when executing the program, implements the fault control method of the electric drive system provided in the above-described embodiments.
Further, the vehicle further includes:
a communication interface 703 for communication between the memory 701 and the processor 702.
A memory 701 for storing computer programs operable on the processor 702.
The Memory 701 may include a high-speed RAM (Random Access Memory) Memory, and may also include a non-volatile Memory, such as at least one disk Memory.
If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 may be connected to each other through a bus and perform communication with each other. The bus may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
Optionally, in a specific implementation, if the memory 701, the processor 702, and the communication interface 703 are integrated on a chip, the memory 701, the processor 702, and the communication interface 703 may complete mutual communication through an internal interface.
The processor 702 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
Embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored, which when executed by a processor, implements the fault control method of the electric drive system as above.
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.
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, a field programmable gate array, 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.
Claims (10)
1. A fault control method of an electric drive system is characterized in that the electric drive system comprises a drive motor and a motor controller, the motor controller comprises a three-phase upper bridge arm and a three-phase lower bridge arm, and the method comprises the following steps:
when the electric drive system fault is detected, acquiring the current rotating speed of the drive motor;
judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value or not; and
and if the current rotating speed is less than or equal to the rotating speed threshold, controlling the three-phase upper bridge arm and the three-phase lower bridge arm to be simultaneously turned off, otherwise, controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously turned on so as to enter a short-circuit state, and controlling the bridge arm entering the short-circuit state to be simultaneously turned off when the current rotating speed is reduced by less than or equal to the rotating speed threshold.
2. The method of claim 1, wherein the controlling the three-phase lower bridge arms to be simultaneously conducted into a short-circuit state comprises:
controlling the three-phase upper bridge arm to be turned off at the same time, controlling the three-phase lower bridge arm to be turned on at the same time, and applying a first preset duty ratio on the three-phase lower bridge arm;
detecting the current phase current of the three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value;
and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
3. The method according to claim 1, wherein the controlling the three-phase upper bridge arms to be simultaneously conducted into a short-circuit state comprises:
controlling the three-phase lower bridge arm to be turned off at the same time, controlling the three-phase upper bridge arm to be turned on at the same time, and applying a first preset duty ratio to the three-phase upper bridge arm;
detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value;
and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
4. The method according to any one of claims 1 to 3, wherein before controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously conducted into the short-circuit state, the method further comprises:
judging whether the fault of the electric drive system is a fault of a motor controller, wherein the fault of the motor controller comprises a three-phase upper bridge arm fault and a three-phase lower bridge arm fault;
if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state;
and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
5. A fault protection device of an electric drive system is characterized in that the electric drive system comprises a drive motor and a motor controller, the motor controller comprises a three-phase upper bridge arm and a three-phase lower bridge arm, and the fault protection device comprises:
the acquisition module is used for acquiring the current rotating speed of the driving motor when the electric driving system fault is detected;
the judging module is used for judging whether the current rotating speed of the driving motor is greater than a rotating speed threshold value or not; and
and the control module is used for controlling the three-phase upper bridge arm and the three-phase lower bridge arm to be simultaneously turned off if the current rotating speed is less than or equal to the rotating speed threshold, otherwise, controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously turned on to enter a short-circuit state, and controlling the bridge arm which enters the short-circuit state to be simultaneously turned off when the current rotating speed is reduced to be less than the rotating speed threshold.
6. The device of claim 5, wherein the control module is further configured to control the three-phase upper bridge arms to be turned off at the same time, control the three-phase lower bridge arms to be turned on at the same time, and apply a first preset duty ratio to the three-phase lower bridge arms; detecting the current phase current of the three-phase lower bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
7. The device of claim 5, wherein the control module is further configured to control the three-phase lower bridge arms to be turned off at the same time, control the three-phase upper bridge arms to be turned on at the same time, and apply a first preset duty ratio to the three-phase upper bridge arms; detecting the current phase current of the three-phase upper bridge arm, and judging whether the current phase current is smaller than a current threshold value; and if the current of the current is smaller than the current threshold, increasing the first preset duty ratio by a preset step length when the first preset duty ratio is smaller than a second preset duty ratio.
8. The device according to any one of claims 5 to 7, wherein the control module is further configured to determine whether a fault of an electric drive system is a fault of a motor controller before controlling the three-phase upper bridge arm or the three-phase lower bridge arm to be simultaneously conducted into a short-circuit state, wherein the fault of the motor controller includes a fault of the three-phase upper bridge arm and a fault of the three-phase lower bridge arm; if the three-phase upper bridge arm fails, controlling the three-phase lower bridge arm to be conducted simultaneously to enter a short-circuit state; and if the three-phase lower bridge arm fails, controlling and controlling the three-phase upper bridge arm to be conducted simultaneously to enter a short-circuit state.
9. A vehicle, characterized by comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of fault protection of an electric drive system according to any of claims 1 to 4.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor for implementing the method of fault protection of an electric drive system according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111561589.9A CN114261284A (en) | 2021-12-16 | 2021-12-16 | Fault control method and device for electric drive system, vehicle and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111561589.9A CN114261284A (en) | 2021-12-16 | 2021-12-16 | Fault control method and device for electric drive system, vehicle and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114261284A true CN114261284A (en) | 2022-04-01 |
Family
ID=80827980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111561589.9A Pending CN114261284A (en) | 2021-12-16 | 2021-12-16 | Fault control method and device for electric drive system, vehicle and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114261284A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202293A1 (en) * | 2022-04-22 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Control method and apparatus for electric motor, and electric device and storage medium |
| CN117791502A (en) * | 2024-02-23 | 2024-03-29 | 中国第一汽车股份有限公司 | Vehicle motor protection method, device, computer equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107124124A (en) * | 2017-04-01 | 2017-09-01 | 苏州汇川联合动力系统有限公司 | A kind of motor threephase stator winding active shorting system and method |
| CN111211540A (en) * | 2020-01-20 | 2020-05-29 | 菲仕绿能科技(宁波)有限公司 | Active short circuit method for preventing torque impact |
| CN112572151A (en) * | 2020-10-30 | 2021-03-30 | 深圳市禾望电气股份有限公司 | Active short-circuit protection method and controller for motor and motor control system |
| CN113630062A (en) * | 2021-08-24 | 2021-11-09 | 山东宝雅新能源汽车有限公司 | Protection method for motor controller after fault |
-
2021
- 2021-12-16 CN CN202111561589.9A patent/CN114261284A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107124124A (en) * | 2017-04-01 | 2017-09-01 | 苏州汇川联合动力系统有限公司 | A kind of motor threephase stator winding active shorting system and method |
| CN111211540A (en) * | 2020-01-20 | 2020-05-29 | 菲仕绿能科技(宁波)有限公司 | Active short circuit method for preventing torque impact |
| CN112572151A (en) * | 2020-10-30 | 2021-03-30 | 深圳市禾望电气股份有限公司 | Active short-circuit protection method and controller for motor and motor control system |
| CN113630062A (en) * | 2021-08-24 | 2021-11-09 | 山东宝雅新能源汽车有限公司 | Protection method for motor controller after fault |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202293A1 (en) * | 2022-04-22 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Control method and apparatus for electric motor, and electric device and storage medium |
| CN117791502A (en) * | 2024-02-23 | 2024-03-29 | 中国第一汽车股份有限公司 | Vehicle motor protection method, device, computer equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11177751B2 (en) | Motor controller, active short circuit thereof, and method for controlling active short via the same | |
| JP5397432B2 (en) | Rotating electrical machine drive system | |
| US8369049B2 (en) | Method for shutting down an electric machine in the event of a malfunction | |
| US11283389B2 (en) | Motor system | |
| CN114261284A (en) | Fault control method and device for electric drive system, vehicle and storage medium | |
| JP6119475B2 (en) | In-vehicle motor controller | |
| CN110829949A (en) | Electric drive system fault protection method and device, vehicle and storage medium | |
| US8825252B2 (en) | Vehicle and control method therefor | |
| JP6972248B1 (en) | Control device for rotary electric machine for vehicles | |
| JP2018113734A (en) | Motor controller | |
| RU2716412C1 (en) | Drive device and method of controlling vehicle drive device | |
| US20230179136A1 (en) | Motor control device, motor unit, and vehicle | |
| WO2021182013A1 (en) | Control circuit for power converter | |
| CN112350550B (en) | Switch driving circuit and switch driving device | |
| CN115378343A (en) | Motor control method and device, electric equipment and storage medium | |
| CN112019129B (en) | Drive protection method, bridge type drive system and motor controller | |
| JP7302194B2 (en) | Abnormality determination device | |
| US20220393568A1 (en) | Drive circuit for power converter | |
| CN118404993A (en) | Capacitor voltage management method, device, electronic equipment and readable medium | |
| JP2024030733A (en) | Rotating electrical machine control device | |
| JP5269567B2 (en) | Electric motor control device and vehicle | |
| CN117962629A (en) | Motor controller with short circuit isolation function, power assembly and electric vehicle | |
| CN115621989A (en) | Active short circuit of motor and electric automobile | |
| CN113708344A (en) | Overvoltage protection method and circuit for inverter direct-current bus and motor controller | |
| JP2021129399A (en) | Control circuit of power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |