Thermal protection method and device of capacitor, equipment, storage medium and program product

Abstract

The invention relates to a thermal protection method, device and equipment of a capacitor, a storage medium and a program product, and relates to the technical field of electric automobiles. The method is executed by a motor control system of the vehicle and comprises the steps that under the condition that the vehicle is in a running state, the working current of a thin-film capacitor of a motor controller of the vehicle is obtained; the working current is heating current or cooling current; the steady-state working current is the current when the vehicle is in a steady state; querying a corresponding relation between the working current and a target duration through the working current, and obtaining the target duration corresponding to the working current; under the condition that the working current is the heating current, executing accumulation operation on the reciprocal of at least one target duration; under the condition that the working current is the cooling current, performing cumulative subtraction operation on the reciprocal of at least one target duration; and under the condition that a numerical value obtained after the accumulative operation or the subtractive operation is executed meets a specified threshold value, executing thermal protection operation on the thin-film capacitor.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electric vehicles, and in particular to a thermal protection method, device, equipment, storage medium and program product for a capacitor. Background Art

[0002] With the rapid development of electric vehicle technology, automotive motor controllers play an important role in the operation of electric vehicles. Automotive motor controller film capacitors are components in motor controllers and play a role in protecting circuit systems. Therefore, the protection of automotive motor controller film capacitors is particularly important.

[0003] In the related technology, a temperature sensor can be provided on the film capacitor of the automotive motor controller. The temperature sensor detects the temperature of the film capacitor in real time. When the temperature sensor detects that the temperature of the film capacitor exceeds the safe temperature, it triggers the thermal protection function of the film capacitor to achieve thermal protection of the film capacitor.

[0004] However, in the solution shown in the above-mentioned related art, since the triggering method of the thermal protection kinetic energy of the film capacitor is relatively single, the thermal protection efficiency of the film capacitor of the automotive motor controller is easily low, resulting in poor thermal protection effect of the capacitor. Summary of the invention

[0005] The embodiments of the present application provide a capacitor thermal protection method, device, equipment, storage medium and program product, which can effectively improve the thermal protection efficiency of the thin film capacitor of the vehicle motor controller. The technical solution is as follows:

[0006] In one aspect, a thermal protection method for a capacitor is provided, the method being executed by a motor control system of a vehicle, the method comprising:

[0007] When the vehicle is in a driving state, obtaining the working current of the film capacitor of the motor controller of the vehicle; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0008] By using the working current, querying the corresponding relationship between the working current and the target duration, and obtaining the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle;

[0009] In the case where the working current is a heating current, performing an accumulation operation on the inverse of the at least one target duration;

[0010] In a case where the working current is a cooling current, performing a cumulative subtraction operation on the reciprocal of the at least one target duration;

[0011] When a value obtained after performing the accumulation operation or the subtraction operation meets a specified threshold, a thermal protection operation is performed on the film capacitor.

[0012] On the other hand, a thermal protection method for a capacitor is provided, the method being performed by a calibration bench where a vehicle is located, the method comprising:

[0013] Acquiring at least one operating current when the vehicle is in a steady state;

[0014] Acquiring the time duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value under the at least one working current as the target time duration corresponding to the at least one working current; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0015] The correspondence between the at least one working current and the target duration is stored in the motor control system of the vehicle, so that the motor control system can obtain the working current of the thin film capacitor of the motor controller of the vehicle when the vehicle is in a driving state, query the correspondence between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; when the working current is a heating current, perform an addition operation on the reciprocal of the at least one target duration; when the working current is a cooling current, perform a subtraction operation on the reciprocal of the at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, perform a thermal protection operation on the thin film capacitor.

[0016] On the other hand, a thermal protection device for a capacitor is provided, the device comprising:

[0017] A working current acquisition module, used for acquiring the working current of the film capacitor of the motor controller of the vehicle when the vehicle is in a driving state; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0018] a target duration acquisition module, configured to query the corresponding relationship between the working current and the target duration through the working current, and acquire the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle;

[0019] An accumulation operation execution module, configured to execute an accumulation operation on the inverse of the at least one target duration when the working current is a heating current;

[0020] a cumulative-decreasing operation execution module, configured to execute a cumulative-decreasing operation on the inverse of the at least one target duration when the working current is a cooling current;

[0021] The thermal protection operation execution module is used to execute a thermal protection operation on the film capacitor when a value obtained after executing the accumulation operation or the subtraction operation meets a specified threshold.

[0022] In some embodiments, the thermal protection operation execution module is used to limit the maximum available current of the film capacitor when the value obtained after performing the accumulation operation reaches 1 when the working current is a heating current; or

[0023] In the case where the working current is a cooling current, when the value obtained after performing the cumulative subtraction operation reaches 0, the limitation on the maximum available current of the film capacitor is released.

[0024] On the other hand, a thermal protection device for a capacitor is provided, the device comprising:

[0025] a calibration working current acquisition module, used to acquire at least one working current when the vehicle is in a steady state;

[0026] a calibration target duration acquisition module, used to acquire the duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value under the at least one working current as the target duration corresponding to the at least one working current; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0027] A correspondence storage module is used to store the correspondence between the at least one working current and the target duration in the motor control system of the vehicle, so that the motor control system can obtain the working current of the film capacitor of the motor controller of the vehicle when the vehicle is in a driving state, query the correspondence between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; when the working current is a heating current, perform an accumulation operation on the reciprocal of the at least one target duration; when the working current is a cooling current, perform a subtraction operation on the reciprocal of the at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, perform a thermal protection operation on the film capacitor.

[0028] In some embodiments, the apparatus further comprises:

[0029] A steady-state temperature value acquisition module, used for acquiring a steady-state temperature value of the film capacitor when the vehicle is running to a steady state under a pre-operating condition before acquiring at least one operating current when the vehicle is in a steady state;

[0030] The calibrated target duration acquisition module is used to obtain, when the working current is a cooling current, the time duration for the temperature of the film capacitor to rise from the steady-state temperature value to the specified temperature value under at least one cooling current as the target duration corresponding to the at least one cooling current; and when the working current is a heating current, obtain the time duration for the temperature of the film capacitor to drop from the specified temperature value to the steady-state temperature value under at least one heating current as the target duration corresponding to the at least one heating current.

[0031] In some embodiments, the apparatus further comprises:

[0032] A steady-state temperature value acquisition module is used to obtain the temperature value of the film capacitor when it is in the steady state as the steady-state temperature value of the film capacitor when the vehicle enters the pre-operating condition and the motor operating time of the vehicle meets the specified time threshold and the rising temperature of the motor does not reach the specified temperature threshold.

[0033] In some embodiments, the apparatus further comprises:

[0034] An information acquisition module, used for acquiring the vehicle model information, the common driving condition information of the vehicle and the parameter information of the vehicle before controlling the vehicle to run from the pre-operating condition to the steady state and acquiring the temperature value of the film capacitor when the film capacitor is in the steady state;

[0035] A pre-operating condition determination module is used to determine the pre-operating condition of the vehicle based on the vehicle model information, the common driving condition of the vehicle and the parameter information of the vehicle before controlling the vehicle to run from the pre-operating condition to a steady state and obtaining the temperature value of the film capacitor when it is in the steady state.

[0036] On the other hand, a computer device is provided, comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the thermal protection method of the capacitor as described above.

[0037] On the other hand, a computer-readable storage medium is provided, wherein at least one instruction, at least one program, a code set or an instruction set is stored in the storage medium, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the thermal protection method of the capacitor as described above.

[0038] In another aspect, a computer program product is provided, the computer program product comprising a computer program, the computer program being stored in a computer-readable storage medium. A processor of a computer device reads the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device executes the thermal protection method of the capacitor provided in the above-mentioned various optional implementations.

[0039] The technical solution provided by this application may have the following beneficial effects:

[0040] The motor control system obtains the working current in real time according to the driving status of the vehicle, distinguishes the heating current and the cooling current according to the high and low relationship between the working current and the steady-state working current of the vehicle, calculates the accumulated value or the accumulated subtraction value by querying the relationship between different working currents and the target duration, and performs thermal protection operation on the film capacitor when the accumulated value or the accumulated subtraction value reaches the specified threshold, which can effectively avoid the misjudgment of the thermal protection operation of the film capacitor caused by the working current fluctuation. The accumulated value or the accumulated subtraction value reaches the specified threshold, indicating that the heat currently passing through the film capacitor has accumulated to the point where a dangerous state is likely to occur. Therefore, whether to perform the thermal protection operation of the film capacitor is determined based on the accumulated value or the accumulated subtraction value, ensuring that action is taken when the film capacitor really needs thermal protection. Without over-protecting the film capacitor, the failure of the capacitor caused by overheating is effectively prevented, thereby improving the thermal protection efficiency of the film capacitor of the automotive motor controller and improving the thermal protection effect of the film capacitor.

[0041] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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.

[0043] Figure 1 is a system configuration diagram of a thermal protection method for a capacitor involved in one embodiment of the present application;

[0044] Figure 2 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application;

[0045] Figure 3 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application;

[0046] Figure 4 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application;

[0047] Figure 5 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application;

[0048] Figure 6 is a flow chart of a time icon determination method provided by an embodiment of the present application;

[0049] Figure 7 This is a schematic diagram of the working system structure of a thin film capacitor of a motor controller provided by an embodiment of the present application;

[0050] Figure 8 is a block diagram of a thermal protection device for a capacitor provided by an exemplary embodiment of the present application;

[0051] Fig. 9 is a block diagram of a thermal protection device for a capacitor provided by an exemplary embodiment of the present application;

[0052] Fig.10 It is a structural diagram of a computer device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0053] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0054] Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.

[0055] Figure 1FIG. 1 is a system configuration diagram of a thermal protection method for a capacitor according to an embodiment of the present application. Figure 1 As shown, the method is executed by the motor control system 100a of the vehicle 100, and when the vehicle 100 is in a driving state, the working current of the film capacitor 10 is obtained; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle 100; the cooling current is a current lower than the steady-state working current of the vehicle 100; the steady-state working current is the current when the vehicle 100 is in a steady state; through the working current, the correspondence between the working current and the target duration is queried to obtain the target duration corresponding to the working current; the target duration is the duration when the working current is reduced to the steady-state working current of the vehicle 100 or the duration when the working current is increased to the steady-state working current of the vehicle 100; when the working current is a heating current, an accumulation operation is performed on the reciprocal of at least one target duration; when the working current is a cooling current, a subtraction operation is performed on the reciprocal of at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, a thermal protection operation is performed on the film capacitor 10.

[0056] Figure 2 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application. The method is executed by a motor control system of a vehicle. For example, the motor control system may be the above-mentioned Figure 1 The motor control system 100a shown. The thermal protection method of the capacitor may include steps 210, 220, 230, 240 and 250, which are specifically implemented as follows:

[0057] Step 210: When the vehicle is in driving state, obtain the working current of the film capacitor of the vehicle's motor controller; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state.

[0058] The above-mentioned driving state refers to the state in which the vehicle is running, that is, the vehicle is not stationary.

[0059] The above-mentioned film capacitor is a capacitor using a film material as a dielectric. The film capacitor stores charge by sandwiching two layers of metal conductors between the film dielectric material.

[0060] The above-mentioned working current refers to the actual current flowing through the film capacitor.

[0061] The steady-state operating current refers to the current in the motor control system when the vehicle is running stably and without acceleration or deceleration.

[0062] In an embodiment of the present application, the motor control system is provided with a current sensor, which can detect and record the actual current flowing through the thin film capacitor in real time when the vehicle is in a driving state; when the current sensor detects that the actual current currently flowing through the thin film capacitor is higher than the steady-state operating current of the vehicle, the vehicle control system identifies the current as a heating current; when the current sensor detects that the actual current currently flowing through the thin film capacitor of the vehicle's motor controller is lower than the steady-state operating current of the vehicle, the vehicle control system identifies the current as a cooling current.

[0063] Step 220: query the corresponding relationship between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle.

[0064] In some embodiments, each working current has a corresponding target duration, and the motor control system includes a database, which stores different working currents and the target duration corresponding to each working current. After obtaining the working current, the motor control system can query the database / cache / memory to obtain the target duration corresponding to the working current.

[0065] In other embodiments, each working current range corresponds to a target duration, and different working current ranges correspond to different target durations. After obtaining the working current, the motor control system determines the working current range to which the working current belongs, and obtains the target duration corresponding to the working current range as the target duration corresponding to the working current.

[0066] Step 230: When the working current is a heating current, perform an accumulation operation on the inverse of at least one target duration.

[0067] In an embodiment of the present application, a cumulative counter is provided in the motor control system. When the working current is identified as a heating current, the motor control system obtains the inverse of the target duration corresponding to the heating current and adds the inverse of the target duration to the cumulative counter.

[0068] Step 240: When the working current is a cooling current, perform a cumulative subtraction operation on the inverse of at least one target duration.

[0069] In an embodiment of the present application, a cumulative counter is provided in the motor control system. When the working current is identified as a cooling current, the motor control system obtains the inverse of the target duration corresponding to the cooling current and subtracts the corresponding inverse from the cumulative counter.

[0070] Step 250: When the value obtained after performing the accumulation operation or the accumulation operation meets the specified threshold, perform a thermal protection operation on the film capacitor.

[0071] The above-mentioned specified threshold is a pre-set critical value. When the value obtained after the motor control system performs an accumulation operation or a subtraction operation meets the critical value, a thermal protection operation of the film capacitor is triggered.

[0072] The thermal protection operation is a measure taken by the motor control system to protect the film capacitor from thermal damage.

[0073] In an embodiment of the present application, the total value of the motor control system after performing an addition operation or a subtraction operation reaches a specified threshold, indicating that the current accumulated heat of the film capacitor has reached a level that requires thermal protection measures to be implemented, such as reducing power output or disconnecting the circuit.

[0074] In some embodiments, the specified threshold corresponding to the accumulation operation performed by the motor control system is different from the specified threshold corresponding to the accumulation operation performed by the motor control system.

[0075] In an embodiment of the present application, the motor control system obtains the working current in real time according to the driving status of the vehicle, distinguishes the heating current and the cooling current according to the high and low relationship between the working current and the steady-state working current of the vehicle, and calculates the accumulated value or the accumulated subtraction value by querying the relationship between different working currents and the target duration. When the accumulated value or the accumulated subtraction value reaches the specified threshold, the thermal protection operation is performed on the film capacitor, which can effectively avoid the misjudgment of the thermal protection operation of the film capacitor caused by the fluctuation of the working current. The accumulated value or the accumulated subtraction value reaches the specified threshold, indicating that the heat currently passing through the film capacitor has accumulated to the point where a dangerous state is likely to occur. Therefore, whether to perform the thermal protection operation of the film capacitor is determined based on the accumulated value or the accumulated subtraction value, ensuring that action is taken when the film capacitor really needs thermal protection. Without over-protecting the film capacitor, the failure of the capacitor caused by overheating is effectively prevented, the thermal protection efficiency of the film capacitor of the vehicle motor controller is improved, and the thermal protection effect of the capacitor is improved.

[0076] Based on the solutions shown in any one or more of the above embodiments, based on Figure 2 , please refer to Figure 3 , Figure 3 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application. Figure 2 Step 250 in the embodiment may be implemented as step 250a or step 250b, as follows:

[0077] Step 250a: When the working current is a heating current, when the value obtained after the accumulation operation reaches 1, the maximum available current of the film capacitor is limited.

[0078] The maximum available current refers to the maximum current that the motor control system allows to pass through the film capacitor.

[0079] In an embodiment of the present application, when the working current is a heating current, when the accumulated value obtained after the motor control system performs the accumulation operation reaches 1, it means that the accumulated heating amount of the film capacitor under the current working current has exceeded the safety threshold, which may cause danger caused by overheating. At this time, the motor control system limits the maximum current allowed to pass through the film capacitor.

[0080] Step 250b: When the working current is the cooling current, and the value obtained after the cumulative subtraction operation reaches 0, the limitation on the maximum available current of the film capacitor is released.

[0081] In an embodiment of the present application, when the value reaches 0 after the motor control system performs the cumulative subtraction operation, it indicates that the current temperature of the film capacitor is already within the safe temperature range. At this time, the motor control system can cancel the maximum current limit previously applied to the film capacitor to prevent the film capacitor from overheating, and no longer impose additional current limits.

[0082] In an embodiment of the present application, when the working current is a heating current and the accumulated value reaches 1, the motor control system immediately limits the maximum available current of the film capacitor, that is, limits the heat that can flow through the film capacitor, effectively reduces the generation of additional heat, and avoids accelerated capacitor aging or performance degradation caused by continuous high temperature; when the working current is a cooling current, the maximum current limit is released when the accumulated value returns to zero, indicating that when the capacitor temperature drops to a safe range, the motor control system can quickly resume normal working state, effectively ensuring the efficient operation of the vehicle motor controller, and through the above two different thermal protection operation triggering methods, the thermal protection operation performed by the motor control system is more targeted, effectively improving the timeliness and pertinence of thermal protection measures, and at the same time optimizing the energy management of the motor control system, extending the service life of the film capacitor, effectively improving the thermal protection efficiency of the film capacitor of the vehicle motor controller, and improving the protection effect of the film capacitor.

[0083] Figure 4 4 is a flow chart of a thermal protection method for a capacitor provided by an embodiment of the present application. The method is executed by a calibration bench where a vehicle is located, and includes steps 410, 420, and 430:

[0084] Step 410: Obtain at least one operating current when the vehicle is in a steady state.

[0085] Step 420: Obtain the time duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value under at least one working current as the target time duration corresponding to at least one working current; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state.

[0086] Among them, the above-mentioned specified temperature value is a preset temperature threshold used to indicate the upper temperature limit that the temperature of the film capacitor of the vehicle's motor controller can reach. For example, the specified temperature value can be any temperature value in the temperature range of 100 to 110 degrees Celsius, such as 105 degrees Celsius.

[0087] The time required for the temperature of the film capacitor to reach a specified temperature value refers to the time required for the film capacitor to be heated from an initial operating temperature to a safe upper temperature limit of the film capacitor under a specific operating current.

[0088] Step 430: Store the correspondence between at least one working current and the target duration in the motor control system of the vehicle, so that the motor control system can obtain the working current of the film capacitor of the motor controller of the vehicle when the vehicle is in a driving state, query the correspondence between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; when the working current is a heating current, perform an addition operation on the reciprocal of at least one target duration; when the working current is a cooling current, perform a subtraction operation on the reciprocal of at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, perform a thermal protection operation on the film capacitor.

[0089] In an embodiment of the present application, the calibration test bench where the vehicle is located can record at least one working current of the vehicle in a stable operating state, monitor and record the time required for at least one working current in the thin film capacitor to rise from the initial temperature to the critical temperature specified temperature value, and this time is defined as the target time.

[0090] In an embodiment of the present application, the calibration test bench where the vehicle is located can obtain the working current of the vehicle in a steady state, and at each working current, measure the time required for the temperature of the film capacitor to reach a specified temperature value, as the target duration, and store the measured data in the motor control system, so that the motor control system can monitor the working current of the film capacitor of the motor controller of the current vehicle in real time during vehicle driving, and query the corresponding target duration according to the pre-stored data, and perform thermal protection operations on the film capacitor based on the target duration. The above scheme is executed based on the measured data, which can more accurately predict the thermal behavior of the capacitor, improve the thermal protection effect of the capacitor, and extend the service life of the capacitor.

[0091] Based on the schemes shown in any one or more of the above embodiments, in some embodiments, before obtaining at least one working current when the vehicle is in a steady state, the calibration test bench obtains the steady-state temperature value of the film capacitor when the vehicle runs to a steady state under the pre-operating condition.

[0092] Among them, the above-mentioned pre-conditions refer to a set of standardized initial conditions set for the vehicle by the standard test bench before the thermal performance test of the vehicle's film capacitor is carried out. The conditions include but are not limited to the cooling water temperature of the vehicle's electric drive system and the starting power of the vehicle's electric drive system. The purpose is to ensure that subsequent tests start under the same and controllable conditions, and eliminate the influence of temperature differences caused by different conditions on the test results.

[0093] For example, the above conditions may be the cooling water temperature of the vehicle's electric drive system and the operating power of the electric drive system. When the cooling water temperature of the vehicle's electric drive system reaches 65 degrees Celsius and the electric drive system operates at rated power, the current vehicle meets the pre-conditions.

[0094] The above step 420 can be implemented as follows: when the working current is a cooling current, the time it takes for the temperature of the film capacitor to rise from a steady-state temperature value to a specified temperature value under at least one cooling current is obtained as the target time corresponding to at least one cooling current; when the working current is a heating current, the time it takes for the temperature of the film capacitor to drop from a specified temperature value to a steady-state temperature value under at least one heating current is obtained as the target time corresponding to at least one heating current.

[0095] In an embodiment of the present application, when the working current is lower than the steady-state working current, that is, when the working current is the cooling current, the calibration bench monitors and records the time required for the temperature of the thin film capacitor to rise from the steady-state temperature to the specified temperature value, and this time is defined as the target time corresponding to the cooling current.

[0096] In an embodiment of the present application, when the working current is higher than the steady-state working current, that is, when the working current is a heating current, the calibration bench monitors and records the time required for the temperature of the thin film capacitor to drop from a specified temperature value to the steady-state temperature, and this time is defined as the target time corresponding to the heating current.

[0097] In an embodiment of the present application, the calibration test bench where the vehicle is located obtains the steady-state temperature value of the film capacitor when the vehicle runs to a steady state under the pre-operating condition, and obtains the time for the film capacitor temperature to rise from the steady-state temperature value to the specified temperature value for the cooling current, so that the film capacitor can make preventive preparations in advance; for the heating current, the time for the film capacitor temperature to drop from the specified temperature value to the steady-state temperature value is obtained, which helps to evaluate the recovery ability of the film capacitor after overheating and ensure that the film capacitor is cooled quickly within a safe range; based on different working currents and different target time lengths, the thermal protection of the film capacitor is targeted and the thermal protection efficiency of the film capacitor is effectively improved.

[0098] Based on the schemes shown in any one or more of the above-mentioned embodiments, in some embodiments, after the vehicle enters the pre-operating condition, the running time of the vehicle's motor meets the specified time threshold, and the rising temperature of the motor does not reach the specified temperature threshold, the calibration test bench where the vehicle is located obtains the temperature value of the film capacitor when it is in a steady state as the steady-state temperature value of the film capacitor.

[0099] In an embodiment of the present application, after the vehicle enters the pre-operating condition, the calibration test bench where the vehicle is located monitors the motor operating time and the temperature of the motor in real time. When it is monitored that the motor operating time meets the specified time threshold and the rising temperature of the vehicle's motor does not reach the specified temperature threshold, the current temperature value of the thin film capacitor is obtained.

[0100] In an embodiment of the present application, when the vehicle enters a specific pre-operating condition, the vehicle's motor operating time meets a specified time threshold, and the motor's temperature rise does not exceed the set safety upper limit (specified temperature threshold), the vehicle's calibration test bench obtains the current film capacitor temperature as the steady-state temperature value of the film capacitor, making the measured steady-state temperature value more representative, and being able to more accurately reflect the thermal behavior of the capacitor in a real working environment, thereby improving the accuracy of the evaluation of the steady-state temperature value of the film capacitor.

[0101] Based on the schemes shown in any one or more of the above-mentioned embodiments, in some embodiments, before controlling the vehicle to run from a pre-operating condition to a steady state and obtaining the temperature value of the film capacitor when it is in a steady state, the calibration test bench where the vehicle is located obtains the vehicle model information, the vehicle's common driving condition information and the vehicle's parameter information; the vehicle's pre-operating condition is determined based on the vehicle model information, the vehicle's common driving condition and the vehicle's parameter information.

[0102] The vehicle model information indicates the specific brand or model of the vehicle.

[0103] Among them, the common driving condition information of the above-mentioned vehicle indicates the driving mode used by the vehicle in daily life.

[0104] Among them, the above-mentioned vehicle parameter information is key information indicating the performance of the vehicle motor, such as battery capacity, motor power or weight distribution.

[0105] In an embodiment of the present application, the calibration test bench where the vehicle is located can obtain vehicle model information from a vehicle database, obtain the vehicle's common driving condition information through the user's common driving condition records, and obtain vehicle parameter information through real-time monitoring by the vehicle's sensors.

[0106] In an embodiment of the present application, after the calibration test bench where the vehicle is located obtains the above three types of information, the vehicle's pre-operating conditions corresponding to the above three types of information can be generated through a machine learning model; wherein, the machine learning model is a machine learning model that has the ability to generate the vehicle's pre-operating conditions based on the vehicle's model information, the vehicle's common driving condition information and the vehicle's parameter information.

[0107] In the embodiment of the present application, the specific electrical environment and design specifications of the thin film capacitor can be clarified through the vehicle model information. Determining the vehicle's pre-operating conditions based on the vehicle model information can ensure that subsequent test conditions meet the actual usage scenarios of the capacitor. Combined with the vehicle's common driving condition information, it can simulate the owner's daily driving mode and effectively improve the reliability of the pre-operating conditions subsequently obtained. Through the vehicle's parameter information, the details of the pre-operating conditions can be set to ensure that the test process is targeted. Combining the above three types of information to determine the pre-operating conditions can improve the accuracy of the obtained pre-operating conditions.

[0108] Based on the above Figures 2 to 4 In the steps of the embodiments, the embodiments of the present application show a method, system and device for thermal protection of a thin film capacitor of a vehicle motor controller, which are specifically as follows.

[0109] Please refer to Figure 5 , Figure 5 FIG. 1 is a flow chart of a method for thermal protection of a film capacitor of a motor controller for a vehicle provided by an embodiment of the present application. Figure 5 As shown, the method includes step 510 , step 520 , step 530 and step 550 .

[0110] Step 510: The vehicle is powered on and starts to travel.

[0111] In the embodiment of the present application, the vehicle motor controller starts to work, the whole vehicle is powered on, the vehicle starts to move, and enters the driving condition.

[0112] Step 520: Detect the magnitude of the working current in real time.

[0113] In an embodiment of the present application, when the vehicle enters a driving condition, a current detection sensor in the vehicle motor controller detects the operating current of the vehicle motor controller in real time.

[0114] Step 530: Look up the corresponding up / down count value according to the detected current magnitude.

[0115] In the embodiment of the present application, after detecting the operating current, the vehicle motor controller obtains the increase / decrease count value corresponding to the operating current through the operating current query time chart.

[0116] Among them, the above-mentioned time icons include a heating time chart and a cooling time chart; the heating time icon is a time chart of the temperature of the film capacitor of the vehicle's motor controller rising from the temperature of the previous steady-state operating condition to the film capacitor's temperature resistance point of 105°C; the cooling time icon is a time chart of the temperature of the film capacitor of the vehicle's motor controller rising from the temperature of the previous steady-state operating condition to the film capacitor's temperature resistance point of 105°C.

[0117] Please refer to Figure 6 , Figure 6 6 is a flow chart of a time icon determination method provided by an embodiment of the present application. The method includes step 61, step 62, step 63, step 64, step 65 and step 66, which are specifically as follows.

[0118] Step 61: Determine the pre-conditions of the motor controller.

[0119] In an embodiment of the present application, the vehicle can obtain vehicle parameters (such as vehicle weight, drag coefficient, front and rear drive torque distribution, etc.), vehicle model and typical driving scenarios of the vehicle, and determine the pre-conditions for thermal protection of the motor controller based on the three types of information obtained.

[0120] Step 62: Control the motor controller to run according to the previous working condition until it reaches a thermally stable state, and record the thermal equilibrium temperature T1.

[0121] In the embodiment of the present application, the vehicle is operated on the drive system test bench according to the pre-operation condition to a thermal equilibrium state, and the motor controller records the thermal equilibrium temperature value T1 of the film capacitor.

[0122] Step 63: Control the motor controller to run at the current set in Table 1 until the thermal stability or the film capacitor temperature resistance threshold reaches 105°C, and record the running time t 增 .

[0123] For example, please refer to Table 1, which is a temperature rise time chart indicating the time and current for the temperature of the film capacitor of the motor controller to rise from the previous steady-state condition to the film capacitor temperature resistance level of 105°C.

[0124]

[0125] In an embodiment of the present application, the motor driver is controlled to run on a test bench, from the pre-operating condition to the steady state, and the time for the motor driver's film capacitor to reach the film capacitor temperature limit of 105°C from various operating currents (1.1 times to the maximum current) is calibrated and recorded. The time recorded in Table 1 is the overheat protection time.

[0126] Step 64: Determine whether the current operation set in Table 1 is completed.

[0127] Step 65: Run the system to the temperature T1 of the pre-condition according to the current set in Table 2, and record the running time t减 .

[0128] For example, please refer to Table 2, which is a cooling time chart indicating the time and current for the temperature of the film capacitor of the motor controller to cool from the film capacitor temperature resistance store of 105°C to the steady-state temperature of the pre-operating condition.

[0129]

[0130] In an embodiment of the present application, the time it takes for a film capacitor of a vehicle motor controller to drop from 105° C. to a temperature of thermal equilibrium under the pre-condition at various operating currents (1.0 times to 0 current) is calibrated and recorded.

[0131] Step 66: Determine whether the current operation set in Table 2 is completed.

[0132] Step 540: The minimum accumulated value is 0. If the accumulated value reaches 1, thermal protection of the film capacitor is performed to limit the current to the pre-condition current.

[0133] In an embodiment of the present application, when the operating current of the film capacitor of the vehicle motor controller is higher than the pre-operating current, the count is increased according to the size of the operating current, and when the count reaches 1, the thermal protection of the film capacitor of the vehicle motor controller is turned on; when the operating current of the film capacitor of the vehicle motor controller is lower than the pre-operating current, the count is decreased according to the size of the operating current, and when the count is decreased to 0, the thermal protection function is reset.

[0134] In some embodiments, when the count value reaches 1, the vehicle motor controller triggers the thermal protection of the controller film capacitor, limiting the current to below the pre-operating current, ensuring that the motor controller capacitor does not exceed the temperature resistance threshold, thereby achieving the purpose of protecting the film capacitor.

[0135] Increment count conversion method:

[0136] 1. When the working current is higher than the rated current and does not exceed the current span change in Table 1, the count value corresponding to the current is accumulated. When the accumulated value reaches 1, the overheat protection of the film capacitor of the motor controller is triggered.

[0137] 2. The working current is higher than the rated current and the working current value changes: before the change, the increment count value corresponding to the working current is accumulated. After the change, the increment count value corresponding to the new current is accumulated on the basis of the accumulated value. When the accumulated value reaches 1, the overheat protection of the film capacitor of the motor controller is triggered.

[0138] Down count conversion method:

[0139] The working current value is at or below the rated current: based on the previously accumulated count value, the count value is decremented according to the accumulated decrement value corresponding to the working current. After the count value is reduced to 0, the thermal protection of the motor controller film capacitor is reset.

[0140] Please refer to Figure 7 , Figure 7 It is a schematic diagram of the working system structure of a thin film capacitor of a motor controller provided by an embodiment of the present application. Figure 7 As shown, the working system of the motor controller thin film capacitor includes a high voltage battery 71, a motor controller 72, and a drive motor 73, wherein the motor controller 72 has a built-in thin film capacitor 72a.

[0141] In the embodiment of the present application, the thin film capacitor 72a is located at the front end of the motor controller 72, connected to the positive and negative bus bars of the high-voltage battery 71, filters and smoothes the high-voltage voltage, and then outputs the high-voltage voltage to the IGBT (Insulated Gate Bipolar Transistor Module) module. The IGBT module converts direct current into alternating current to supply the drive motor 73.

[0142] In the embodiment of the present application, the above-mentioned scheme can make the capacity of the film capacitor selected by the motor controller smaller, greatly reduce the cost, and make the product more competitive; without adding a temperature sensor, it can effectively prevent the thermal failure problem of the film capacitor, thereby improving the protection effect of the film capacitor of the vehicle motor controller.

[0143] The above is only an embodiment of the present application and should not be regarded as limiting the present application. Professionals should understand that various deformations and modifications can be made to the embodiments to adapt to different application requirements. Therefore, the scope of the present application should be limited by the claims attached to the claims.

[0144] Please refer to Figure 8 , which shows a block diagram of a thermal protection device for a capacitor provided by an exemplary embodiment of the present application. The thermal protection device for the capacitor can be implemented as all or part of a computer device by hardware or a combination of hardware and software to achieve the above Figure 2 and Figure 3 All or part of the steps in the embodiments shown. Figure 8 As shown, the thermal protection device of the capacitor includes:

[0145] The working current acquisition module 801 is used to acquire the working current of the film capacitor when the vehicle is in a driving state; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0146] The target duration acquisition module 802 is used to query the corresponding relationship between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle;

[0147] An accumulation operation execution module 803, configured to execute an accumulation operation on the inverse of at least one target duration when the working current is a heating current;

[0148] A cumulative subtraction operation execution module 804, configured to execute a cumulative subtraction operation on the inverse of at least one target duration when the working current is a cooling current;

[0149] The thermal protection operation execution module 805 is used to execute a thermal protection operation on the film capacitor when the value obtained after the addition operation or the subtraction operation meets the specified threshold.

[0150] In some embodiments, the thermal protection operation execution module 805 is used to limit the maximum available current of the film capacitor when the value obtained after performing the accumulation operation reaches 1 when the working current is the heating current; or

[0151] In the case where the working current is the cooling current, when the value obtained after performing the cumulative subtraction operation reaches 0, the maximum available current of the film capacitor is released.

[0152] Please refer to Fig. 9 , which shows a block diagram of a thermal protection device for a capacitor provided by an exemplary embodiment of the present application. The thermal protection device for the capacitor can be implemented as all or part of a computer device by hardware or a combination of hardware and software to achieve the above Figure 4 All or part of the steps in the illustrated embodiments.

[0153] like Fig. 9 As shown, the thermal protection device of the capacitor includes:

[0154] The calibration working current acquisition module 901 is used to acquire at least one working current when the vehicle is in a steady state;

[0155] The calibration target duration acquisition module 902 is used to acquire the duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value under at least one working current as the target duration corresponding to at least one working current; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state;

[0156] The correspondence storage module 903 is used to store the correspondence between at least one working current and the target duration in the motor control system of the vehicle, so that the motor control system can obtain the working current of the film capacitor of the motor controller of the vehicle when the vehicle is in a driving state, query the correspondence between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; when the working current is a heating current, perform an addition operation on the reciprocal of at least one target duration; when the working current is a cooling current, perform a subtraction operation on the reciprocal of at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, perform a thermal protection operation on the film capacitor.

[0157] In some embodiments, the apparatus further comprises:

[0158] A steady-state temperature value acquisition module, used to acquire a steady-state temperature value of the film capacitor when the vehicle is running to a steady state under a pre-operating condition before acquiring at least one operating current when the vehicle is in a steady state;

[0159] The calibrated target duration acquisition module 902 is used to, when the working current is a cooling current, obtain the time it takes for the temperature of the film capacitor to rise from a steady-state temperature value to a specified temperature value under at least one cooling current as the target time corresponding to at least one cooling current; when the working current is a heating current, obtain the time it takes for the temperature of the film capacitor to drop from a specified temperature value to a steady-state temperature value under at least one heating current as the target time corresponding to at least one heating current.

[0160] In some embodiments, the apparatus further comprises:

[0161] The steady-state temperature value acquisition module is used to obtain the temperature value of the film capacitor in a steady state as the steady-state temperature value of the film capacitor when the vehicle enters the pre-operating condition, the motor running time of the vehicle meets the specified time threshold, and the rising temperature of the motor does not reach the specified temperature threshold.

[0162] In some embodiments, the apparatus further comprises:

[0163] An information acquisition module, used to acquire vehicle model information, common driving condition information of the vehicle and parameter information of the vehicle before controlling the vehicle to run from the pre-operation condition to the steady state and acquiring the temperature value of the film capacitor when it is in the steady state;

[0164] The pre-operating condition determination module is used to determine the pre-operating condition of the vehicle based on the vehicle model information, the vehicle's common driving conditions and the vehicle's parameter information before controlling the vehicle to run from the pre-operating condition to a steady state and obtaining the temperature value of the film capacitor when it is in a steady state.

[0165] Please refer to Fig.10 , Fig.10 1 is a schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application. The computer device 1000 includes a central processing unit (CPU) 1001, a system memory 1004 including a random access memory (RAM) 1002 and a read-only memory (ROM) 1003, and a system bus 1005 connecting the system memory 1004 and the central processing unit 1001. The computer device 1000 also includes a basic input / output system (I / O system) 1006 for helping to transmit information between various devices in the computer, and a large-capacity storage device 1007 for storing an operating system 1013, application programs 1014 and other program modules 1015.

[0166] The basic input / output system 1006 includes a display 1008 for displaying information and an input device 1009 such as a mouse and a keyboard for user inputting information. The display 1008 and the input device 1009 are connected to the central processing unit 1001 through an input / output controller 1010 connected to the system bus 1005. The basic input / output system 1006 may also include an input / output controller 1010 for receiving and processing inputs from a plurality of other devices such as a keyboard, a mouse, or an electronic stylus. Similarly, the input / output controller 1010 also provides output to a display screen, a printer, or other types of output devices.

[0167] The mass storage device 1007 is connected to the central processing unit 1001 through a mass storage controller (not shown) connected to the system bus 1005. The mass storage device 1007 and its associated computer readable media provide non-volatile storage for the computer device 1000. That is, the mass storage device 1007 may include a computer readable medium (not shown) such as a hard disk or a CD-ROM (Compact Disc Read-Only Memory) drive.

[0168] Without loss of generality, computer readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media include RAM (Random Access Memory), ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory or other solid-state storage technologies, CD-ROM, DVD (Digital Video Disc) or other optical storage, cassettes, magnetic tapes, disk storage or other magnetic storage devices. Of course, those skilled in the art will appreciate that computer storage media are not limited to the above. The above-mentioned system memory 1004 and mass storage device 1007 can be collectively referred to as memory.

[0169] The computer device 1000 can be connected to the Internet or other network devices through a network interface unit 1011 connected to the system bus 1005 .

[0170] The memory also includes one or more programs, one or more programs are stored in the memory, and the central processing unit 1001 implements the one or more programs by executing the one or more programs. Figures 2 to 4 All or part of the steps in the method shown.

[0171] In an exemplary embodiment, a chip is also provided. The chip includes a programmable logic circuit and / or program instructions. When the chip runs on a computer device, it is used to implement all or part of the steps of the method shown in the above embodiments of the present application.

[0172] In an exemplary embodiment, a computer program product is also provided, the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor reads and executes the computer instructions from the computer-readable storage medium to implement all or part of the steps of the method shown in the above-mentioned various embodiments of the present application.

[0173] In an exemplary embodiment, a computer-readable storage medium is also provided, in which a computer program is stored. The computer program is loaded and executed by a processor to implement all or part of the steps of the method shown in the above-mentioned embodiments of the present application.

[0174] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program. The above program may be stored in a computer-readable storage medium. The above storage medium may be a read-only memory, a disk or an optical disk, etc.

[0175] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0176] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A thermal protection method for a capacitor, characterized in that: The method is performed by a motor control system of a vehicle, and includes: When the vehicle is in a driving state, obtaining the working current of the film capacitor of the motor controller of the vehicle; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state; By using the working current, querying the corresponding relationship between the working current and the target duration, and obtaining the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle; In the case where the working current is a heating current, performing an accumulation operation on the inverse of the at least one target duration; In a case where the working current is a cooling current, performing a cumulative subtraction operation on the reciprocal of the at least one target duration; When a value obtained after performing the accumulation operation or the subtraction operation meets a specified threshold, a thermal protection operation is performed on the film capacitor.

2. The method according to claim 1, characterized in that When the value obtained after performing the accumulation operation or the subtraction operation meets the specified threshold, performing a thermal protection operation on the film capacitor includes: In the case where the working current is a heating current, when the value obtained after performing the accumulation operation reaches 1, limiting the maximum available current of the film capacitor; or, In the case where the working current is a cooling current, when the value obtained after performing the cumulative subtraction operation reaches 0, the limitation on the maximum available current of the film capacitor is released.

3. A thermal protection method for a capacitor, characterized in that: The method is performed by a calibration bench on which the vehicle is located, and comprises: Acquiring at least one operating current when the vehicle is in a steady state; Acquiring the time duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value under the at least one working current as the target time duration corresponding to the at least one working current; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state; The correspondence between the at least one working current and the target duration is stored in the motor control system of the vehicle, so that the motor control system can obtain the working current of the thin film capacitor of the motor controller of the vehicle when the vehicle is in a driving state, query the correspondence between the working current and the target duration through the working current, and obtain the target duration corresponding to the working current; when the working current is a heating current, perform an addition operation on the reciprocal of the at least one target duration; when the working current is a cooling current, perform a subtraction operation on the reciprocal of the at least one target duration; when the value obtained after performing the addition operation or the subtraction operation meets the specified threshold, perform a thermal protection operation on the thin film capacitor.

4. The method according to claim 3, characterized in that Before obtaining at least one operating current when the vehicle is in a steady state, the method further includes: Obtaining a steady-state temperature value of the film capacitor when the vehicle runs to a steady state under the pre-operating condition; The obtaining, under the at least one working current, the time duration for the temperature of the film capacitor of the motor controller of the vehicle to reach a specified temperature value as the target time duration corresponding to the at least one working current includes: In the case where the working current is a cooling current, obtaining the time duration for the temperature of the film capacitor to rise from the steady-state temperature value to a specified temperature value under at least one cooling current as the target time duration corresponding to the at least one cooling current; In the case where the working current is a heating current, the time duration for the temperature of the film capacitor to decrease from the specified temperature value to the steady-state temperature value under at least one heating current is obtained as the target time duration corresponding to the at least one heating current.

5. The method according to claim 4, characterized in that The step of obtaining the steady-state temperature value of the film capacitor when the vehicle runs to a steady state under the pre-operating condition includes: After the vehicle enters the pre-operating condition, when the motor operation time of the vehicle meets the specified time threshold and the rising temperature of the motor does not reach the specified temperature threshold, the temperature value of the film capacitor when it is in the steady state is obtained as the steady-state temperature value of the film capacitor.

6. The method according to any one of claims 4 or 5, characterized in that: Before obtaining the steady-state temperature value of the film capacitor when the vehicle runs to a steady state under the pre-operating condition, the method further includes: Acquire the vehicle model information, common driving condition information of the vehicle and parameter information of the vehicle; The pre-operating condition of the vehicle is determined based on the vehicle model information, the common driving condition of the vehicle and the parameter information of the vehicle.

7. A thermal protection device for a capacitor, characterized in that: The device comprises: A working current acquisition module, used for acquiring the working current of the film capacitor of the motor controller of the vehicle when the vehicle is in a driving state; the working current is a heating current or a cooling current; the heating current is a current higher than the steady-state working current of the vehicle; the cooling current is a current lower than the steady-state working current of the vehicle; the steady-state working current is the current when the vehicle is in a steady state; a target duration acquisition module, configured to query the corresponding relationship between the working current and the target duration through the working current, and acquire the target duration corresponding to the working current; the target duration is the duration for the working current to decrease to the steady-state working current of the vehicle or the duration for the working current to increase to the steady-state working current of the vehicle; An accumulation operation execution module, configured to execute an accumulation operation on the inverse of the at least one target duration when the working current is a heating current; a cumulative-decreasing operation execution module, configured to execute a cumulative-decreasing operation on the inverse of the at least one target duration when the working current is a cooling current; The thermal protection operation execution module is used to execute a thermal protection operation on the film capacitor when a value obtained after executing the accumulation operation or the subtraction operation meets a specified threshold.

8. A computer device, characterized in that: The computer device includes a processor and a memory, wherein instructions are stored in the memory, and the instructions are executed by the processor to implement the thermal protection method for the capacitor according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The storage medium stores instructions, and the instructions are executed by a processor of a computer device to implement the thermal protection method for a capacitor as claimed in any one of claims 1 to 6.

10. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium; the computer instructions are read and executed by a processor of a computer device to implement the thermal protection method for a capacitor as described in any one of claims 1 to 6.

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