Driving system, control method thereof, control equipment and computer readable storage medium

Abstract

The invention discloses a driving system, a control method thereof, a control device and a computer readable storage medium, and relates to the technical field of power electronics, and the driving system control method comprises the steps: after the driving system enters a driving capability switching process, periodically predicting a risk value of an abnormal disconnection behavior of a main contactor of the driving system; and if the risk value of the abnormal disconnection behavior of the main contactor is greater than a preset risk threshold value, controlling the driving system to jump from the driving capability switching process to the main connection disconnection protection process so as to control the driving system to operate according to the safe driving capability. The problem of overstress failure of the power module of the driving system under the condition that the main contactor is abnormally disconnected can be avoided, so that the reliability and the safety of the driving system are improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a drive system and a control method thereof, a control device, and a computer-readable storage medium. Background Art

[0002] During the process of switching the driving capacity, the driving system will dynamically adjust the switching speed of the power module of the driving system according to the real-time working conditions of the inverter, so as to simultaneously take into account the needs of improving the switching speed of the driving module (i.e., driving capacity) and reducing the switching loss of the power module.

[0003] However, during the process of switching the driving capacity of the drive system, if the main contactor between the inverter and the battery in the drive system is abnormally disconnected, the bus voltage of the drive system will rise rapidly. The sudden increase in bus voltage will cause the drive system to be unable to switch to the driving capacity that meets the safe state in time, which will cause the shutdown stress of the power module to exceed the safe working area, causing the power module to fail due to overstress. Summary of the invention

[0004] The main purpose of this application is to provide a drive system and its control method, control device, and computer-readable storage medium, aiming to avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, so as to improve the reliability and safety of the drive system.

[0005] To achieve the above object, the present application provides a drive system control method, the method comprising:

[0006] After the drive system enters the drive capability switching process, periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system;

[0007] If the risk value of abnormal disconnection of the main contactor is greater than a preset risk threshold, the drive system is controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability.

[0008] In one embodiment, the step of periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system includes:

[0009] Periodically acquiring a voltage change value of a bus voltage of the drive system;

[0010] A risk value of abnormal disconnection behavior of the main contactor is determined according to the voltage change value.

[0011] In one embodiment, the step of determining the risk value of abnormal disconnection behavior of the main contactor according to the voltage change value includes:

[0012] The voltage change value is used as a risk value of abnormal disconnection behavior of the main contactor.

[0013] In one embodiment, the step of determining the risk value of abnormal disconnection behavior of the main contactor according to the voltage change value includes:

[0014] If the voltage change value is less than or equal to the preset change threshold, the first preset risk value is used as the risk value of abnormal disconnection behavior of the main contactor;

[0015] If the voltage change value is greater than the preset change threshold, a second preset risk value is used as a risk value of abnormal disconnection behavior of the main contactor;

[0016] The first preset risk value is less than or equal to the preset risk threshold, and the second preset risk value is greater than the preset risk threshold.

[0017] In one embodiment, after the step of controlling the drive system to operate according to the safe drive capability, the method further includes:

[0018] Controlling the inverter safety path of the drive system to enter an active short-circuit state;

[0019] After the inverter safety path of the drive system is controlled to enter an active short-circuit state, if it is monitored that the voltage value of the bus voltage of the drive system stops increasing, the drive system is controlled to enter a high-voltage discharge mode.

[0020] In one embodiment, before the driving system enters the driving capability switching process, the method further includes:

[0021] Monitoring whether the inverter safety path of the drive system is in an open state;

[0022] If so, the driving system is controlled to enter a driving capability switching process.

[0023] In one embodiment, before the step of controlling the drive system to operate according to the safe drive capability, the method further includes:

[0024] A matching test is performed on the driving module of the driving system and the power module connected to the driving module to obtain the safe driving capability.

[0025] In addition, to achieve the above-mentioned purpose, the present application also provides a drive system, which includes a controller, a drive module, an inverter and a main contactor, the inverter includes a power module, and the drive system is used to implement the steps of the drive system control method as described above.

[0026] In addition, to achieve the above-mentioned purpose, the present application also provides a control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the drive system control method as described above.

[0027] In addition, to achieve the above-mentioned purpose, the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the drive system control method as described above are implemented.

[0028] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned drive system control method when executed by a processor.

[0029] The present application provides a drive system control method. After the drive system enters the drive capability switching process, by periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system, it is determined whether there is a potential abnormal disconnection risk of the main contactor of the drive system; if the risk value of abnormal disconnection behavior of the main contactor is greater than the preset risk threshold, it means that there is a potential abnormal disconnection risk of the main contactor of the drive system, and then the drive system can be controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability, that is, the drive system uses the safe drive capability to turn on and off the power module. Therefore, if the main contactor is abnormally disconnected soon, the power module of the electric drive system will not fail due to the inability of the electric drive system to switch to the drive capability that meets the safe state in time, because the drive system has exited the drive capability switching process in advance and has been using the safe drive capability to turn on and off the power module.

[0030] In summary, the present application predicts whether the main contactor of the drive system has a potential risk of abnormal disconnection, so as to control the electric drive system to switch to a driving capability that meets the safe state in advance when the main contactor of the drive system is predicted to have a potential risk of abnormal disconnection. This can effectively avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, thereby improving the reliability and safety of the drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 A schematic diagram of the driving system provided in an embodiment of the present application when switching driving capabilities;

[0034] Figure 2 A schematic flow chart of a driving system control method provided in the first embodiment of the present application;

[0035] Figure 3 A schematic diagram of the overall process of the drive system control method provided in an embodiment of the present application;

[0036] Figure 4 The overall implementation timing diagram of the drive system control method provided in the embodiment of the present application;

[0037] Figure 5 A schematic diagram of the module structure of the drive system provided in an embodiment of the present application;

[0038] Figure 6 A schematic diagram of the structure of the hardware operating environment involved in the embodiments of the present application.

[0039] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0041] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0042] In the drive system, please refer to Figure 1 (In the figure, Rgon1~2, Rgoff1~2 are driving resistors, and Q1 is a power module). The commonly used driving capability switching strategy is to switch the driving capability according to the junction temperature of the power module, the bus voltage, and the inverter output current. Among them, the driving resistance determines the switching speed and switching loss of the power module during the switching process. The increase in switching speed will lead to an increase in the electrical stress of the power module, which will increase the risk of overstress failure of the power module; and if the driving resistance is increased in order to suppress the problem of overstress failure of the power module, the switching loss of the power module will increase.

[0043] During the process of switching the driving capacity, the driving system will dynamically adjust the switching speed of the power module of the driving system according to the real-time working conditions of the inverter, so as to simultaneously take into account the needs of improving the switching speed of the driving module (i.e., driving capacity) and reducing the switching loss of the power module.

[0044] However, during the process of switching the driving capacity of the drive system, if the main contactor between the inverter and the battery in the drive system is abnormally disconnected, the bus voltage of the drive system will rise rapidly. The sudden increase in bus voltage will cause the drive system to be unable to switch to the driving capacity that meets the safe state in time, which will cause the shutdown stress of the power module to exceed the safe working area, causing the power module to fail due to overstress.

[0045] There are two commonly used bus voltage overvoltage detection protection methods: one is to compare the bus voltage value with the set threshold through software detection. If the bus voltage value exceeds the set threshold, the software executes the relevant protection strategy. The other is to design the relevant protection logic through the bus voltage hardware comparison circuit. When the comparator flips, the hardware executes the relevant protection logic. For the above two methods, the power module will have overstress failure problems when the main contactor is abnormally disconnected.

[0046] Based on this, the present application provides a drive system control method, after the drive system enters the drive capability switching process, by periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system, to determine whether the main contactor of the drive system has a potential abnormal disconnection risk; if the risk value of abnormal disconnection behavior of the main contactor is greater than the preset risk threshold, it means that the main contactor of the drive system has a potential abnormal disconnection risk, then the drive system can be controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability, that is, the drive system uses the safe drive capability to turn on and off the power module. Therefore, if the main contactor is abnormally disconnected soon, the power module of the electric drive system will not fail due to the inability of the electric drive system to switch to the drive capability that meets the safe state in time.

[0047] In summary, the present application predicts whether the main contactor of the drive system has a potential risk of abnormal disconnection, so as to control the electric drive system to switch to a driving capability that meets the safe state in advance when the main contactor of the drive system is predicted to have a potential risk of abnormal disconnection. This can effectively avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, thereby improving the reliability and safety of the drive system.

[0048] The executor of the driving system control method of the present application can be a control device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc.; it can also be a driving system, a control circuit, etc. that can realize the above functions; it can also be the driving system itself, which is not specifically limited in this embodiment.

[0049] The following embodiments are described below by taking the drive system as an example.

[0050] Based on this, the present application proposes a driving system control method of the first embodiment, please refer to Figure 2 , the driving system control method includes steps S10 to S20:

[0051] Step S10, after the drive system enters the drive capability switching process, periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system;

[0052] It should be noted that after the drive system enters the drive capability switching process, the drive system begins to dynamically adjust the switching speed of the power module of the drive system according to the real-time working condition of the inverter. The size of the risk value of abnormal disconnection behavior of the main contactor of the drive system can be used to characterize whether there is a potential abnormal disconnection risk of the main contactor of the drive system; the parameters used to reflect the risk value of abnormal disconnection behavior of the main contactor may include but are not limited to the bus voltage of the drive system, the parameters that cause the main contactor to have abnormal disconnection behavior (such as environmental information such as the temperature and humidity of the environment in which the electric drive system is located) or other parameters that can reflect the health status of the main contactor (such as the current, temperature and other operating parameters of the electric drive system).

[0053] It is understandable that since the main contactor is connected between the inverter and the battery, if the main contactor is abnormally disconnected, then under the feeding condition of the inverter, the voltage that should be given to the battery will be given to the inverter, causing the bus voltage to rise rapidly. Therefore, the risk value of abnormal disconnection of the main contactor of the drive system can be predicted based on the voltage change of the bus voltage. On this basis, in a feasible implementation, step S10 can include steps S11 to S12:

[0054] Step S11, periodically obtaining a voltage change value of a bus voltage of a drive system;

[0055] Step S12: determining the risk value of abnormal disconnection of the main contactor according to the voltage change value.

[0056] It should be noted that the voltage change value refers to the change in the voltage value of the bus voltage at the current moment relative to the voltage value at the previous moment. Among them, when determining the risk value of abnormal disconnection of the main contactor based on the voltage change value, the voltage change value can be directly used as the risk value of abnormal disconnection of the main contactor; or the voltage change value can be converted to a certain value and the converted value can be used as the risk value of abnormal disconnection of the main contactor; or the risk value of abnormal disconnection of the main contactor can be determined based on the relationship between the voltage change value and the preset change threshold. This embodiment does not specifically limit the specific implementation of step S12.

[0057] In another feasible implementation, the historical operation data of the main contactor (such as the number, time, and cause of normal and abnormal disconnection) can be used to establish a prediction model for predicting the risk value of abnormal disconnection of the main contactor through statistical analysis methods (such as regression analysis, time series analysis, etc.). Afterwards, when actually predicting the risk value of abnormal disconnection of the main contactor according to the established prediction model, it is considered that the operating parameters of the electric drive system (such as current, voltage, temperature, etc.) can reflect the real-time health status of the main contactor, and the environmental information of the environment in which the electric drive system is located (such as temperature, humidity, etc.) may affect the performance and life of the main contactor. Therefore, step S10 may include: periodically obtaining the operating parameters of the electric drive system and the environmental information of the environment in which the battery system is located; inputting the obtained operating parameters and environmental information into the preset prediction model to obtain the risk value of abnormal disconnection of the main contactor.

[0058] The above are only two feasible implementations of step S10 provided in this embodiment, and this embodiment does not specifically limit the specific implementation of step S10.

[0059] Step S20: If the risk value of abnormal disconnection of the main contactor is greater than a preset risk threshold, the drive system is controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability.

[0060] It should be noted that the preset risk threshold is the basis for determining whether there is a potential risk of abnormal disconnection of the main contactor of the drive system. The preset risk threshold can be a default value, or it can be flexibly set by the user according to actual conditions, and this embodiment does not specifically limit this. Safe driving capability refers to the driving capability that meets the safe state. After the drive system enters the main disconnection protection process, the drive system will operate according to the safe driving capability, that is, the drive system will use the safe driving capability to turn on and off the power module.

[0061] In a feasible implementation manner, before step S20, the drive system control method further includes step S201:

[0062] Step S201 , performing a matching test on a driving module of a driving system and a power module connected to the driving module to obtain a safe driving capability.

[0063] It should be noted that the driving module may include a driver and a driving resistor.

[0064] It is understandable that after the drive module of the drive system is matched with the power module connected to the drive module, the drive capability within the limit of the drive parameter of the drive module can be obtained, and this drive capability is the safe drive capability. Generally speaking, the safe drive capability is usually the minimum drive capability of the drive system.

[0065] This embodiment provides a drive system control method. After the drive system enters the drive capability switching process, by periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system, it is determined whether there is a potential abnormal disconnection risk of the main contactor of the drive system; if the risk value of abnormal disconnection behavior of the main contactor is greater than the preset risk threshold, it means that there is a potential abnormal disconnection risk of the main contactor of the drive system, and then the drive system can be controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability, that is, the drive system uses the safe drive capability to open and close the power module. Therefore, if the main contactor is abnormally disconnected soon, the power module of the electric drive system will not fail due to the inability of the electric drive system to switch to the drive capability that meets the safe state in time.

[0066] In summary, this embodiment predicts whether the main contactor of the drive system has a potential risk of abnormal disconnection, so as to control the electric drive system to switch to a driving capability that meets the safe state in advance when the main contactor of the drive system is predicted to have a potential risk of abnormal disconnection. This can effectively avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, thereby improving the reliability and safety of the drive system.

[0067] In a feasible implementation, step S12 may include steps S121 to S122:

[0068] Step S121, if the voltage change value is less than or equal to the preset change threshold, the first preset risk value is used as the risk value of abnormal disconnection behavior of the main contactor;

[0069] Step S122, if the voltage change value is greater than the preset change threshold, the second preset risk value is used as the risk value of abnormal disconnection behavior of the main contactor; wherein the first preset risk value is less than or equal to the preset risk threshold, and the second preset risk value is greater than the preset risk threshold.

[0070] It should be noted that the preset change threshold is the basis for determining whether a sudden increase in bus voltage occurs. The preset change threshold can be a default value, or can be flexibly set by the user according to actual conditions, and this embodiment does not specifically limit this. Among them, in other implementations of step S12, if the voltage change value is directly used as the risk value of abnormal disconnection behavior of the main contactor, the preset risk threshold and the preset change threshold are essentially the same value.

[0071] In addition, it should be noted that the first preset risk value is used to indicate that there is no potential abnormal disconnection risk of the main contactor; the second preset risk value is used to indicate that there is a potential abnormal disconnection risk of the main contactor. The first preset risk value and the second preset risk value can both be a default value, or can be flexibly set by the user according to actual conditions, and this embodiment does not specifically limit this.

[0072] In this embodiment, when the voltage change value is less than or equal to the preset change threshold, that is, when it is determined that the bus voltage has not increased suddenly, it can be determined that the main contactor does not have a potential abnormal disconnection risk, and the first preset risk value less than or equal to the preset risk threshold, that is, the first preset risk value used to indicate that the main contactor does not have a potential abnormal disconnection risk, can be used as the risk value of the main contactor's abnormal disconnection behavior. Thus, the subsequent drive system will not jump out of the driving capacity switching process. In the case where the voltage change value is greater than the preset change threshold, that is, when it is determined that the bus voltage has increased suddenly, it can be determined that the main contactor has a potential abnormal disconnection risk, and the second preset risk value greater than the preset risk threshold, that is, the second preset risk value used to indicate that the main contactor has a potential abnormal disconnection risk, can be used as the risk value of the main contactor's abnormal disconnection behavior. Thus, the subsequent drive system will jump out of the driving capacity switching process and enter the main disconnection protection process, so that the electric drive system switches to a driving capacity that meets the safety state in advance.

[0073] Based on the above first embodiment, a second embodiment of the driving system control method of the present application is proposed. In the second embodiment, after step S20, the driving system control method may further include steps S21 to S22:

[0074] Step S21, controlling the inverter safety path of the drive system to enter an active short-circuit state;

[0075] It should be noted that by simultaneously opening the upper three bridges or the lower three bridges of the inverter, the inverter safety path can be made to enter an active short circuit (ASC, Active Short Circuit) state.

[0076] It is understandable that after the inverter safety path of the control drive system enters the active short-circuit state, the motor stator winding can form a closed loop. In this way, the back electromotive force generated by the motor will be consumed inside the stator winding, and will not flow into the power supply to charge the voltage stabilizing capacitor. In this way, the increase of the bus voltage can be effectively suppressed.

[0077] Step S22, after the inverter safety path of the driving system is controlled to enter the active short-circuit state, if it is monitored that the voltage value of the bus voltage of the driving system stops increasing, the driving system is controlled to enter the high-voltage discharge mode.

[0078] It is understandable that after the control drive system enters the high-voltage discharge mode, the electric energy in the inverter bus capacitor can be consumed or transferred to other energy storage elements through the discharge circuit. As the electric energy is released, the charge on the bus capacitor will gradually decrease, thereby reducing the bus voltage value to a safe voltage value range.

[0079] In this embodiment, after controlling the drive system to operate according to the safe driving capability, the inverter safety path of the drive system is first controlled to enter an active short-circuit state to suppress the increase of the bus voltage; after monitoring that the voltage value of the bus voltage of the drive system stops increasing, the drive system is controlled to enter a high-voltage discharge mode, so that the voltage value of the bus voltage can be quickly discharged to a safe voltage value range, so as to avoid the drive system being in a state of excessively high bus voltage for a long time, which affects the reliability and safety of the drive system, thereby improving the reliability and safety of the drive system.

[0080] Based on the above first embodiment and / or second embodiment, a third embodiment of the driving system control method of the present application is proposed. In the third embodiment, before the driving system enters the driving capability switching process, the driving system control method may further include steps S01 to S02:

[0081] Step S01, monitoring whether the inverter safety path of the drive system is in an open state;

[0082] Step S02: If yes, the driving system is controlled to enter the driving capability switching process.

[0083] It is understandable that if the inverter safety path of the drive system has not yet entered the open-tube state, it means that the battery system has not yet completed initialization, and the drive system may currently be establishing the bus voltage. In the process of establishing the bus voltage, the voltage value of the bus voltage of the drive system will continue to increase. Therefore, if the drive system is controlled to enter the drive capacity switching process before the inverter safety path of the drive system has entered the open-tube state, it may cause misjudgment in the subsequent process of determining whether the main contactor of the drive system has a potential risk of abnormal disconnection.

[0084] Therefore, this embodiment requires that the inverter safety path of the drive system is in an open state, that is, the bus voltage of the drive system is established before the drive system is controlled to enter the drive capacity switching process. This ensures that it can be accurately determined whether the main contactor of the drive system has a potential risk of abnormal disconnection.

[0085] For example, to help understand the overall implementation process of the drive system control method obtained by combining the above embodiments, please refer to Figure 3 and Figure 4 , taking the risk value of abnormal disconnection of the main contactor as the voltage change value of the bus voltage as an example, specifically:

[0086] The main contactor of the drive system starts to close at time t0, and then completes the establishment of the bus voltage at time t1; at time t1-t2, the controller of the drive system will start the initialization process to confirm whether the inverter safety path of the drive system has entered the open-tube state; if so, at time t2, the drive system is controlled to enter the drive capacity switching process and start to periodically predict the risk value of abnormal disconnection behavior of the main contactor of the drive system;

[0087] If it is determined through prediction that the voltage change value of the bus voltage of the drive system in the interval time from t3 to t4 is greater than the preset change threshold, then at time t4, it is necessary to control the drive system to jump from the driving capacity switching process to the main disconnection protection process to control the drive system to operate according to the safe driving capacity; then, at time t5, the inverter safety path of the drive system is controlled to enter the active short-circuit state; after that, at time t6, if it is monitored that the voltage value of the bus voltage of the drive system stops increasing, the drive system can be controlled to enter the high-voltage discharge mode; finally, the drive system will complete the discharge process at time t7 to discharge the voltage value of the bus voltage to the safe voltage value range.

[0088] If the voltage change value of the bus voltage of the drive system during the interval between t3 and t4 is less than or equal to the preset change threshold, the drive system will continue in the drive capability switching process.

[0089] It should be noted that this example is only used to assist in understanding the present application and does not constitute a limitation on the drive system control method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0090] The present application also provides a driving system, please refer to Figure 5 The drive system includes a controller 10, a drive module 20, an inverter 30 and a main contactor 40, the inverter 30 includes a power module, and the drive system can be used to implement the steps of the drive system control method in the above embodiment.

[0091] The drive system provided by the embodiment of the present application can avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, so as to improve the reliability and safety of the drive system. Compared with the prior art, the beneficial effects of the drive system provided by the embodiment of the present application are the same as the beneficial effects of the drive system control method provided by the above embodiment, which will not be repeated here.

[0092] An embodiment of the present application also provides a control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the drive system control method in the above embodiment.

[0093] Reference below Figure 6 , which shows a structural schematic diagram of a control device suitable for implementing an embodiment of the present application. Figure 6 The control device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0094] like Figure 6As shown, the control device may include a processing device 101 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 102 or a program loaded from a storage device 103 to a random access memory (RAM: Random Access Memory) 104. In RAM104, various programs and data required for the operation of the control device are also stored. The processing device 101, ROM102, and RAM104 are connected to each other through a bus 105. An input / output (I / O) interface 106 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 106: an input device 107 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 108 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 103 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 109. The communication device 109 can allow the control device to communicate with other devices wirelessly or by wire to exchange data. Although the control device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have instead.

[0095] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 103, or installed from a ROM 102. When the computer program is executed by the processing device 101, the above-mentioned functions defined in the method of the embodiment of the present application are executed.

[0096] The control device provided in the embodiment of the present application adopts the drive system control method in the above embodiment, which can avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, so as to improve the reliability and safety of the drive system. Compared with the prior art, the beneficial effects of the control device provided in the embodiment of the present application are the same as the beneficial effects of the drive system control method provided in the above embodiment, and other technical features in the control device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0097] It should be understood that each part of the embodiments of the present application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application shall be based on the protection scope of the above claims.

[0099] An embodiment of the present application also provides a computer-readable storage medium storing a computer program executable on a processor, wherein the computer program is used to execute the drive system control method in the above embodiment.

[0100] The computer-readable storage medium provided in the embodiment of the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including, but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0101] The computer-readable storage medium may be included in the control device; or may exist independently without being assembled into the control device.

[0102] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the control device, the control device: after the drive system enters the drive capability switching process, periodically predicts the risk value of abnormal disconnection behavior of the main contactor of the drive system; if the risk value of abnormal disconnection behavior of the main contactor is greater than a preset risk threshold, control the drive system to jump from the drive capability switching process to the main disconnection protection process, so as to control the drive system to operate according to the safe driving capability.

[0103] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0104] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0105] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0106] The computer-readable storage medium provided in the embodiment of the present application stores computer-readable program instructions for executing the above-mentioned drive system control method, which can avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, so as to improve the reliability and safety of the drive system. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the embodiment of the present application are the same as the beneficial effects of the drive system control method provided in the above-mentioned embodiment, and will not be repeated here.

[0107] An embodiment of the present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned drive system control method when the computer program is executed by a processor.

[0108] The computer program product provided in the embodiment of the present application can avoid the problem of overstress failure of the power module of the drive system when the main contactor is abnormally disconnected, so as to improve the reliability and safety of the drive system. Compared with the prior art, the beneficial effects of the computer program product provided in the embodiment of the present application are the same as the beneficial effects of the drive system control method provided in the above embodiment, which will not be repeated here.

[0109] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A drive system control method, It is characterized in that The method comprises: After the drive system enters the drive capability switching process, periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system; If the risk value of abnormal disconnection of the main contactor is greater than a preset risk threshold, the drive system is controlled to jump from the drive capability switching process to the main disconnection protection process to control the drive system to operate according to the safe drive capability.

2. The method according to claim 1, It is characterized in that The step of periodically predicting the risk value of abnormal disconnection behavior of the main contactor of the drive system comprises: Periodically acquiring a voltage change value of a bus voltage of the drive system; A risk value of abnormal disconnection behavior of the main contactor is determined according to the voltage change value.

3. The method according to claim 2, It is characterized in that The step of determining the risk value of abnormal disconnection behavior of the main contactor according to the voltage change value includes: The voltage change value is used as a risk value of abnormal disconnection behavior of the main contactor.

4. The method according to claim 2, It is characterized in that The step of determining the risk value of abnormal disconnection behavior of the main contactor according to the voltage change value includes: If the voltage change value is less than or equal to the preset change threshold, the first preset risk value is used as the risk value of abnormal disconnection behavior of the main contactor; If the voltage change value is greater than the preset change threshold, a second preset risk value is used as a risk value of abnormal disconnection behavior of the main contactor; The first preset risk value is less than or equal to the preset risk threshold, and the second preset risk value is greater than the preset risk threshold.

5. The method according to any one of claims 1 to 4, It is characterized in that After the step of controlling the drive system to operate according to the safe drive capability, the method further includes: Controlling the inverter safety path of the drive system to enter an active short-circuit state; After the inverter safety path of the drive system is controlled to enter an active short-circuit state, if it is monitored that the voltage value of the bus voltage of the drive system stops increasing, the drive system is controlled to enter a high-voltage discharge mode.

6. The method according to any one of claims 1 to 4, It is characterized in that Before the driving system enters the driving capability switching process, the method further includes: Monitoring whether the inverter safety path of the drive system is in an open state; If so, the driving system is controlled to enter a driving capability switching process.

7. The method according to any one of claims 1 to 4, It is characterized in that Before the step of controlling the drive system to operate according to the safe drive capability, the method further includes: A matching test is performed on the driving module of the driving system and the power module connected to the driving module to obtain the safe driving capability.

8. A drive system, It is characterized in that The drive system comprises a controller, a drive module, an inverter and a main contactor, the inverter comprises a power module, and the drive system is used to implement the steps of the drive system control method according to any one of claims 1 to 7.

9. A control device, It is characterized in that The control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the drive system control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the drive system control method according to any one of claims 1 to 7 are implemented.

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