A method, system, medium, and controller for limiting the power control of a power system.

Abstract

This invention discloses a method, system, medium, and controller for limiting the power control of a powertrain system. The method includes: acquiring operating condition parameters, wherein the operating condition parameters include battery management parameters and energy management parameters, the battery management parameters characterizing the power limitation of the battery, and the energy management parameters characterizing the power generated during vehicle operation; performing filtering processing on the energy management parameters to obtain filtered parameters; and determining the powertrain system power boundary to avoid overcharging or over-discharging of the battery based on the filtered parameters, battery management parameters, and energy management parameters. This invention allows the energy management parameters to rise and fall gradually, avoiding sudden increases or decreases in the power generated during vehicle operation, thereby preventing fluctuations in the powertrain system power boundary and ensuring that the available power boundary of the entire vehicle system does not fluctuate. It also prevents fluctuations in the torque demanded by the front and rear drive motors during high-throttle acceleration and deceleration.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, specifically to a method, system, medium, and controller for limiting the power control of a power system. Background Technology

[0002] With the rapid development of new energy vehicles in China, more and more OEMs are launching new energy vehicles with complex hybrid topologies. Compared with gasoline vehicles and pure electric vehicles, hybrid vehicles have more complex powertrain topologies and use multiple power sources (mostly engines and drive motors). Currently, most hybrid models sold in the domestic market are based on a series-parallel hybrid structure. This structure combines the characteristics of series and parallel systems. It can generate electricity through a range extender at low and medium speeds to provide power to the power system, and at high speeds, the engine and drive motor can jointly drive the vehicle to meet power requirements. However, the complexity of the topology is much greater than that of a single drive motor structure, and there are more factors affecting the system's capability boundary. When the driver accelerates with heavy throttle and brakes with light throttle, occasional driving vibrations may occur. In low-temperature environments, battery power is limited, greatly increasing the probability of driving vibrations and battery overcharging and over-discharging. Summary of the Invention

[0003] One of the objectives of this application is to provide a method for limiting the power control of a power system to solve the problems of power boundary jitter and battery overcharging or over-discharging in the prior art.

[0004] A method for limiting the power control of a power system.

[0005] Obtain operating condition parameters, wherein the operating condition parameters include battery management parameters and energy management parameters, the battery management parameters are used to characterize the power limit of the battery, and the energy management parameters are used to characterize the power generated during vehicle operation;

[0006] The energy management parameters are filtered to obtain the filter parameters.

[0007] Based on the filtering parameters, battery management parameters, and energy management parameters, the power boundary of the power system is determined to avoid battery overcharging or over-discharging.

[0008] Furthermore, the battery management parameters include the maximum available charging power boundary of the battery.

[0009] Furthermore, the energy management parameters include the actual total power of the drive motor, the filtering parameters include the filtered actual total power of the drive motor obtained by filtering the actual total power of the drive motor, and the power system power boundary includes the target power generation boundary of the range extender.

[0010] The step of determining the power system power boundary to avoid battery overcharging or over-discharging includes:

[0011] The target power generation boundary of the range extender is determined based on the maximum available charging power boundary of the battery, the actual total power of the filter drive motor, and the actual total power of the drive motor.

[0012] Furthermore, the step of determining the target power generation boundary of the range extender based on the maximum available charging power boundary of the battery, the actual total power of the filter drive motor, and the actual total power of the drive motor includes:

[0013] Calculate the difference between the actual total power of the filter drive motor and the first reserved power to obtain the first difference;

[0014] The first smaller value is obtained based on the smaller of the first difference and the actual total power of the drive motor;

[0015] Calculate the difference between the maximum available charging power boundary of the battery and the second reserved power to obtain the second difference;

[0016] Calculate the difference between the second difference and the high-voltage accessory loss to obtain the third difference;

[0017] The target power generation boundary of the range extender is obtained based on the difference between the first smaller value and the third difference.

[0018] Furthermore, the energy management parameters include the actual power generation of the range extender, and the filtering parameters include the actual power generation of the filtered range extender. The actual power generation of the filtered range extender is obtained as follows:

[0019] Calculate the difference between the actual power generated by the range extender and the second reserved power to obtain the fourth difference;

[0020] The fourth difference is filtered to obtain the actual power generation of the filter range extender.

[0021] Furthermore, the battery management parameters include the maximum available discharge power of the battery, and the power system power boundary includes the available drive power boundary of the drive motor;

[0022] The step of determining the power system power boundary to avoid battery overcharging or over-discharging includes:

[0023] The available drive power boundary of the drive motor is determined based on the actual power output of the range extender, the maximum available charging power of the battery, the maximum available discharging power of the battery, and the actual power output of the filter range extender.

[0024] Furthermore, the step of determining the available drive power boundary of the drive motor based on the actual power generation of the range extender, the maximum available charging power of the battery, the maximum available discharging power of the battery, and the actual power generation of the filtered range extender includes:

[0025] The fifth difference is obtained by calculating the difference between the maximum available charging power boundary of the battery and the loss of the high-voltage accessory.

[0026] Calculate the difference between the actual power output of the range extender and the fifth difference value to obtain the difference parameter;

[0027] The second smallest value is obtained based on the smaller value between the actual power generation of the filter range extender and the difference parameter;

[0028] The larger parameter is obtained based on the larger of the second smaller value and the actual power generation of the range extender;

[0029] The difference between the maximum usable discharge power boundary of the battery and the larger parameter value is calculated to obtain the sixth difference value;

[0030] The difference between the sixth difference and the high-voltage accessory loss is calculated to obtain the available drive power boundary of the drive motor.

[0031] Furthermore, the power boundary of the power system includes the available feedback power boundary of the drive motor, and the step of determining the power boundary of the power system includes:

[0032] The available feedback power boundary of the drive motor is determined based on the maximum available charging power boundary of the battery, the actual power generation of the filter range extender, and the actual power generation of the range extender.

[0033] Furthermore, the step of determining the available feedback power boundary of the drive motor based on the maximum available charging power boundary of the battery, the actual power generation of the filter range extender, and the actual power generation of the range extender includes:

[0034] The third smallest value is obtained based on the smaller of the actual power output of the filter range extender and the actual power output of the range extender.

[0035] The seventh difference is obtained based on the difference between the maximum available charging power boundary of the battery and the third smaller value;

[0036] Based on the difference between the seventh difference and the high-voltage accessory loss, the available feedback power boundary of the drive motor is obtained.

[0037] A power control system for limiting power systems, comprising:

[0038] The acquisition module is configured to acquire operating condition parameters, wherein the operating condition parameters include battery management parameters and energy management parameters, the battery management parameters are used to characterize the power limit of the battery, and the energy management parameters are used to characterize the power generated during vehicle operation;

[0039] The filtering module is configured to perform filtering processing based on the energy management parameters to obtain the filtering parameters;

[0040] The calculation module is configured to determine the power boundary of the power system to avoid battery overcharging or over-discharging based on the filtering parameters, battery management parameters, and energy management parameters.

[0041] A readable storage medium storing at least one instruction or program, which is loaded and executed by a processor to implement the above-described power control method for limiting a power system.

[0042] A controller, comprising a processor and memory;

[0043] The memory is used to store programs;

[0044] The processor is used to execute the above-described power control method for limiting the power system according to the program.

[0045] The technical solution of this application has at least the following advantages:

[0046] This invention is based on the filtering of energy management parameters used to characterize the power generated during vehicle operation. This allows the energy management parameters to rise and fall gradually, avoiding sudden increases or decreases in the power generated during vehicle operation. This prevents fluctuations in the power boundary of the range extender, ensuring that the power boundary of the entire vehicle range extender does not fluctuate. It also avoids fluctuations in the torque demanded by the front and rear drive motors during high-throttle acceleration and braking.

[0047] This invention obtains the power boundary of the power system to avoid overcharging or over-discharging of the battery based on operating parameters and filtering parameters. It correlates the power boundary of the power system with the power limit of the battery and the energy generated during vehicle movement, so as to avoid the problem of overcharging or over-discharging caused by excessive power of the power system exceeding the power limit of the battery.

[0048] This invention limits the target power of the range extender by the maximum available charging power boundary of the battery, the actual total power of the filter drive motor, and the actual total power of the drive motor, and prioritizes energy recovery to charge the battery, which is beneficial to the economy of the whole vehicle and avoids overcharging of the battery when the range extender intervenes.

[0049] This invention limits the actual power of the filter range extender by limiting the actual power of the range extender, thereby enabling a rapid increase or decrease in the available drive power boundary of the drive motor, avoiding overcharging or over-discharging of the battery, and eliminating the drawbacks of slow increase and slow decrease caused by filtering.

[0050] This invention combines the actual power output of the filter range extender, the actual power output of the range extender, and the maximum available charging power boundary of the battery to calculate the available feedback power boundary of the drive motor. This allows the available feedback power boundary of the drive motor to increase rapidly with the actual power output of the range extender, thereby avoiding overcharging. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0052] Figure 1 A schematic diagram illustrating the power boundary closed-loop effect of the SP+P4 topology;

[0053] Figure 2 The flowchart of the method proposed in this embodiment is as follows;

[0054] Figure 3 A flowchart illustrating the method for obtaining the target power generation boundary of the range extender;

[0055] Figure 4 A logic diagram for limiting the target power of the range extender;

[0056] Figure 5 Flowchart of a method for obtaining the available drive power boundary of a drive motor;

[0057] Figure 6 A logic diagram for calculating the drive power boundary of a range extender system;

[0058] Figure 7 Schematic diagram for achieving rapid increase in actual driving power of the drive motor to avoid overcharging;

[0059] Figure 8 Schematic diagram for achieving rapid reduction of actual driving power of the drive motor to avoid over-discharge;

[0060] Figure 9 A logic diagram for calculating the feedback power boundary of a range extender system;

[0061] Figure 10 Flowchart of the method for obtaining the available feedback power boundary of the drive motor;

[0062] Figure 11 Schematic diagram for achieving rapid increase in actual feedback power of the drive motor to avoid overcharging;

[0063] Figure 12 A structural diagram of the system is provided for this embodiment.

[0064] Wherein: 1-Acquisition module; 2-Filtering module; 3-Calculation module. Detailed Implementation

[0065] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0066] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0069] The applicant's in-depth research on existing hybrid vehicles revealed issues of battery overcharging and over-discharging during acceleration and regenerative braking. Taking a complex multi-motor series-parallel four-wheel drive topology as an example, the actual power of each motor affects the power boundaries of the others. The SP+P4 topology is a four-layer closed-loop control system where each layer influences the others; a power fluctuation in one high-voltage component will affect the fluctuations of other components. Figure 1As shown, (1) the fluctuation of the battery's usable boundary causes fluctuation of the charging and discharging power boundaries of the drive motor, front drive motor, and rear drive motor. (2) the fluctuation of the actual power generation of the range extender causes fluctuation of the charging and discharging power boundaries of the drive motor. (3) considering parallel connection and ESP interference, the rear axle needs sufficient power. The short-term power boundary first restricts the rear drive motor, and then the power boundary of the front drive motor is obtained based on the actual power of the rear drive motor. Therefore, the fluctuation of the actual power of the rear drive motor causes fluctuation of the power boundary of the front drive motor. (4) under braking conditions, the drive motor charges the battery. At this time, the actual power generation boundary of the range extender is affected by the actual power of the drive motor. Therefore, under the conditions of high throttle acceleration and regenerative braking, the fluctuation of the power boundaries of the battery, drive motor, front drive motor, and rear drive motor will cause overcharging and over-discharging of the battery and driving vibration of the whole vehicle. In low temperature environment, the actual usable power of the battery is greatly reduced due to the chemical characteristics. When the driver releases the accelerator, the above problems are likely to occur.

[0070] This embodiment addresses the aforementioned problems by proposing a method for limiting the power control of a power system. In at least one embodiment, such as... Figure 2 As shown, this method is specifically as follows:

[0071] S1: Obtain operating condition parameters, including battery management parameters and energy management parameters. Battery management parameters are used to characterize the power limit of the battery, and energy management parameters are used to characterize the power generated during vehicle operation.

[0072] S2: Filtering is performed based on energy management parameters to obtain filter parameters;

[0073] S3: Determine the power boundary of the power system to avoid battery overcharging or over-discharging based on the filter parameters, battery management parameters, and energy management parameters.

[0074] Since batteries generally exist in only two states, charging and discharging, the power limitations of a battery, as characterized by battery management parameters, can be interpreted as power limitations for charging and / or power limitations for discharging.

[0075] The energy generated during vehicle movement mainly comes from the drive motor and range extender. Therefore, energy management parameters can also be interpreted as the actual power generated by the range extender and the actual power of the drive motor.

[0076] In S2, filtering is performed based on energy management parameters to obtain filter parameters, which realizes the gradual increase and decrease of energy management parameters and avoids driving vibration caused by system power boundary jitter.

[0077] This embodiment determines the power boundary of the power system to avoid overcharging or over-discharging of the battery based on filter parameters, battery management parameters and / or energy management parameters. In fact, it combines the power consumed during vehicle operation, the maximum power that can be provided and the power that can be generated to limit the power system power, thereby avoiding the power generation power from exceeding the maximum power that can be provided, which would lead to overcharging, and also avoiding the battery discharge power from exceeding the power to be consumed, which would lead to over-discharging of the battery.

[0078] In at least one embodiment, the power system power boundary in S3 includes the range extender target power generation boundary. By limiting the range extender target power through the range extender target power generation boundary, the electric system capacity is prioritized for the drive motor during driving and feedback processes, which is beneficial to the vehicle's economy and power performance, and avoids range extender target power fluctuations and battery overcharging.

[0079] In this embodiment, the energy management parameters include the actual power of the drive motor, the filtering parameters include the filtered actual power of the drive motor obtained by filtering the actual power of the drive motor, the battery management parameters include the maximum available charging power boundary of the battery, and the target power generation boundary of the range extender is determined based on the maximum available charging power boundary of the battery, the filtered actual total power of the drive motor, and the actual total power of the drive motor.

[0080] It should be explained that the maximum available charging power boundary of a battery represents the time a battery can maintain its charging power, generally referring to a peak charging power of 10 seconds or 5 seconds, meaning it can maintain that power for 10 seconds or 5 seconds. Here, and in the following text, "battery" refers to the battery used in new energy vehicles. The appropriate maximum available charging power boundary can be determined by vehicle manufacturers and battery suppliers through testing and verification based on the specific battery type and vehicle application scenario.

[0081] During braking or deceleration, the actual total power of the drive motor represents its ability to convert mechanical energy into electrical energy during operation. The actual total power of the drive motor is the sum of the actual total power of the front drive motor and the actual total power of the rear drive motor. In other words, for a front-wheel-drive vehicle, the actual total power of the drive motor is the sum of the actual total power of the front drive motor, and for a rear-wheel-drive vehicle, the actual total power of the drive motor is the sum of the actual total power of the rear drive motor.

[0082] Under braking or deceleration conditions, the specific method for determining the power boundary of the power system in S3 is as follows: Figure 3 and Figure 4 As shown:

[0083] S31: Calculate the difference between the actual total power of the filter drive motor and the first reserved power to obtain the first difference;

[0084] S32: The first smaller value is obtained based on the smaller of the first difference and the actual total power of the drive motor;

[0085] S33: Calculate the difference between the maximum available charging power boundary of the battery and the second reserved power to obtain the second difference;

[0086] S34: Calculate the difference between the second difference and the high-voltage accessory loss to obtain the third difference;

[0087] S35: Based on the difference between the first smaller value and the third difference, the target power generation boundary of the range extender is obtained.

[0088] The removal of reserved power in this embodiment is to address potential sudden demands or unexpected situations that may arise in the system. By reserving a certain power margin, it can be ensured that the system can still maintain stable operation in the face of emergencies.

[0089] During operation, the drive motor may be affected by various interferences and noises, resulting in unstable feedback power signals. Filtering can remove these noise components, making the feedback power signal smoother and more accurate. Filtering the drive motor's feedback power also prevents fluctuations in the actual feedback power of the drive motor from causing power boundary jitter in the range extender.

[0090] The smaller of the first difference and the actual total power of the drive motor is used to limit the actual total power of the drive motor. The target power generation boundary of the range extender is determined by the difference between the first smaller value and the third difference. During braking, the available charging capacity is prioritized for the drive motor, avoiding fluctuations in the target power of the range extender. It also solves the problem of battery overcharging caused by the range extender intervening in power generation under low-temperature braking conditions. This ensures that the target power of the range extender will not exceed the battery's charging capacity, thereby avoiding damage to the battery due to excessive charging power.

[0091] High-voltage accessory consumption refers to the power consumed by the high-voltage accessories, which include DC-DC power, passenger cabin air conditioning power, battery thermal management power, etc.

[0092] In at least one embodiment, the power system power boundary in S3 includes the available drive power boundary of the drive motor, used to limit the available drive power of the drive motor. In this embodiment, the battery management parameters include the maximum available charging power boundary and the maximum available discharging power boundary of the battery. The energy management parameters include the actual power generated by the range extender, and the filtering parameters include the actual power generated by the filtered range extender. The actual power generated by the filtered range extender is obtained as follows:

[0093] The difference between the actual power output of the range extender and the second reserved power output is calculated to obtain the fourth difference.

[0094] The fourth difference is filtered to obtain the actual power generation of the filtered range extender.

[0095] The available drive power boundary of the drive motor is determined by the actual power generated by the range extender, the maximum available charging power boundary of the battery, the maximum available discharging power boundary of the battery, and the actual power generated by the filter range extender.

[0096] The actual power generation of the range extender is characterized by the actual electrical power that the drive motor in the range extender system can generate.

[0097] The specific method for determining the power boundary of the dynamic system in S3 is as follows: Figure 5 and Figure 6 As shown:

[0098] S31: Calculate the difference between the maximum available charging power boundary of the battery and the high-voltage accessory loss to obtain the fifth difference value;

[0099] S32: Calculate the difference between the actual power output of the range extender and the fifth difference value to obtain the difference parameter;

[0100] S33: The second smallest value is obtained based on the smaller value between the actual power generation of the filter range extender and the difference parameter;

[0101] S34: The larger parameter is obtained based on the larger of the second smaller value and the actual power generation of the range extender;

[0102] S35: Calculate the difference between the maximum usable discharge power boundary of the battery and the larger parameter value to obtain the sixth difference value;

[0103] S36: Calculate the difference between the sixth difference and the high-voltage accessory loss to obtain the boundary of the available drive power of the drive motor.

[0104] The drive power of a drive motor can be characterized as the maximum power range that the drive motor can safely and effectively output or withstand under specific operating conditions.

[0105] By optimizing the actual power output of the range extender through filtering, the actual power output of the range extender can be gradually increased and decreased, avoiding driving vibration caused by power boundary fluctuations. However, filtering can lead to the absolute value of the filtered actual power output of the range extender being less than the actual power output of the range extender when the battery discharge power is limited under low-temperature conditions. This can easily lead to battery overcharging. Therefore, the difference between the actual power output of the drive motor and the maximum available charging power boundary of the battery is calculated to obtain the power output of the drive motor that needs to be consumed during acceleration. This difference is then compared with the filtered actual power output of the range extender, and the smaller value is taken. This allows the actual available driving power boundary of the drive motor to rise rapidly with the actual power output of the range extender, avoiding battery overcharging caused by excessive power output from the range extender.

[0106] When both the battery and the range extender are power sources, the battery is in a discharging state. Without considering the limitation of avoiding overcharging, the filter can play a role in eliminating jitter. After the above logic limits the available drive power boundary of the drive motor, the total drive power used for the drive motor is reduced.

[0107] like Figure 7 As shown, the above method avoids battery overcharging caused by excessive power generation from the range extender. The reason is that after the actual power generation of the range extender is filtered, the power generation of the range extender used for calculating the power boundary of the drive motor changes slowly due to the filtering effect, resulting in inconsistency with the actual power generation of the range extender. At this time, through the above logic, the filtering is not always active when calculating the available drive power boundary of the drive motor. When it is not active, the available drive power boundary of the drive motor changes with the actual power generation of the range extender, so that the available drive power boundary of the drive motor can rise rapidly with the actual power of the range extender, increasing the available power of the drive motor and consuming this part of the energy, thus avoiding overcharging of the battery.

[0108] like Figure 8 The above method enables the available drive power boundary of the drive motor to also follow the actual power generation of the range extender to achieve rapid reduction, avoiding over-discharge of the battery during acceleration due to filtering.

[0109] In at least one embodiment, the power boundary of the power system in S3 includes the available feedback power boundary of the drive motor, which is characterized by the ability of the drive motor to convert mechanical energy into electrical energy during operation.

[0110] The available feedback power boundary of the drive motor is used to limit the available feedback power of the drive motor, such as... Figure 9 and Figure 10 As shown, the method for obtaining the available feedback power boundary of the drive motor is as follows:

[0111] S31: The third smallest value is obtained based on the smaller of the actual power generation of the filter range extender and the actual power generation of the range extender;

[0112] S32: The seventh difference is obtained based on the difference between the maximum available charging power boundary of the battery and the third smaller value;

[0113] S33: Based on the difference between the seventh difference and the high-voltage accessory loss, the available feedback power boundary of the drive motor is obtained.

[0114] Based on the above logic, it can be ensured that the output power of the range extender will never exceed its actual capacity at any time, thus avoiding excessive burden on the system. Simultaneously, taking the smaller of the actual power output of the filtered range extender and the actual power output of the range extender itself is used to calculate the available feedback power boundary of the drive motor. This allows for a rapid increase in the available feedback power boundary of the drive motor, thereby preventing battery overcharging.

[0115] like Figure 11 As shown, filtering takes effect when the usable regenerative power boundary of the drive motor is not close to the theoretical usable charging power of the drive motor. This allows the usable power boundary of the drive motor to change slowly, unaffected by fluctuations in the actual power output of the range extender. Compared to the unfiltered actual power output of the range extender, the filtered power output shows a gradual increase and decrease. By taking the smaller of the filtered and unfiltered actual power output (negative value), the usable regenerative power boundary of the drive motor rises rapidly when it approaches the theoretical usable charging power, preventing overcharging of the battery due to exceeding power limits. Under regenerative braking conditions, the battery is always in a charging state, so there is no need to consider over-discharge of the battery.

[0116] This embodiment also proposes a power control system for limiting the power of a power system, based on the above method, such as Figure 12 As shown, it includes:

[0117] Module 1 is configured to acquire operating condition parameters, which include battery management parameters and energy management parameters. The battery management parameters are used to characterize the power limit of the battery, and the energy management parameters are used to characterize the power generated during vehicle operation.

[0118] Filtering module 2 is configured to perform filtering based on energy management parameters to obtain filtering parameters.

[0119] Calculation module 3 is configured to determine the power boundary of the power system to avoid battery overcharging or over-discharging based on filtering parameters, battery management parameters, and energy management parameters.

[0120] This embodiment also proposes a readable storage medium storing at least one instruction or program, which is loaded and executed by a processor to achieve the above-described power control method for limiting the power system.

[0121] This embodiment also proposes a controller, including a processor and a memory. The memory stores a program, and the processor executes the aforementioned power control method for limiting the power system according to the program. This vehicle controller can be used not only in SP+P4 topologies and range-extended electric vehicles, but also in hybrid topologies such as P1+P2DHT and P2+P2.5DHT.

[0122] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A method for limiting the power control of a power system, characterized in that: Obtain operating condition parameters, wherein the operating condition parameters include battery management parameters and energy management parameters, the battery management parameters are used to characterize the power limit of the battery, and the energy management parameters are used to characterize the power generated during vehicle operation; The energy management parameters are filtered to obtain the filter parameters. Based on the filtering parameters, battery management parameters, and energy management parameters, determine the power boundary of the power system to avoid battery overcharging or over-discharging. The battery management parameters include the maximum available charging power boundary of the battery; the energy management parameters include the actual total power of the drive motor; the filtering parameters include the filtered actual total power of the drive motor obtained by filtering the actual total power of the drive motor; and the power system power boundary includes the target power generation boundary of the range extender. The step of determining the power system power boundary for avoiding battery overcharging or over-discharging includes: determining the target power generation boundary of the range extender based on the battery's maximum available charging power boundary, the actual total power of the filter drive motor, and the actual total power of the drive motor; The step of determining the target power generation boundary of the range extender based on the maximum available charging power boundary of the battery, the actual total power of the filter drive motor, and the actual total power of the drive motor includes: calculating the difference between the actual total power of the filter drive motor and the first reserved power to obtain a first difference; obtaining a first smaller value based on the smaller of the first difference and the actual total power of the drive motor; calculating the difference between the maximum available charging power boundary of the battery and the second reserved power to obtain a second difference; calculating the difference between the second difference and the high-voltage accessory loss to obtain a third difference; and obtaining the target power generation boundary of the range extender based on the difference between the first smaller value and the third difference.

2. The power control method for limiting a power system according to claim 1, characterized in that: The energy management parameters include the actual power generation of the range extender, and the filtering parameters include the actual power generation of the filtered range extender. The actual power generation of the filtered range extender is obtained as follows: Calculate the difference between the actual power generated by the range extender and the second reserved power to obtain the fourth difference; The fourth difference is filtered to obtain the actual power generation of the filter range extender.

3. The power control method for limiting a power system according to claim 2, characterized in that: The battery management parameters include the maximum available discharge power of the battery, and the power system power boundary includes the available drive power boundary of the drive motor. The step of determining the power system power boundary to avoid battery overcharging or over-discharging includes: The available drive power boundary of the drive motor is determined based on the actual power output of the range extender, the maximum available charging power of the battery, the maximum available discharging power of the battery, and the actual power output of the filter range extender.

4. The power control method for limiting a power system according to claim 3, characterized in that: The step of determining the available drive power boundary of the drive motor based on the actual power generation of the range extender, the maximum available charging power of the battery, the maximum available discharging power of the battery, and the actual power generation of the filtered range extender includes: The fifth difference is obtained by calculating the difference between the maximum available charging power boundary of the battery and the loss of the high-voltage accessory. Calculate the difference between the actual power output of the range extender and the fifth difference value to obtain the difference parameter; The second smallest value is obtained based on the smaller value between the actual power generation of the filter range extender and the difference parameter; The larger parameter is obtained based on the larger of the second smaller value and the actual power generation of the range extender; The difference between the maximum usable discharge power boundary of the battery and the larger parameter value is calculated to obtain the sixth difference value; The difference between the sixth difference and the high-voltage accessory loss is calculated to obtain the available drive power boundary of the drive motor.

5. The power control method for limiting a power system according to claim 2, characterized in that: The power system power boundary includes the available feedback power boundary of the drive motor. The steps for determining the power system power boundary include: The available feedback power boundary of the drive motor is determined based on the maximum available charging power boundary of the battery, the actual power generation of the filter range extender, and the actual power generation of the range extender.

6. The power control method for limiting a power system according to claim 5, characterized in that: The steps for determining the available feedback power boundary of the drive motor based on the maximum available charging power boundary of the battery, the actual power generation of the filter range extender, and the actual power generation of the range extender include: The third smallest value is obtained based on the smaller of the actual power output of the filter range extender and the actual power output of the range extender. The seventh difference is obtained based on the difference between the maximum available charging power boundary of the battery and the third smaller value; Based on the difference between the seventh difference and the high-voltage accessory loss, the available feedback power boundary of the drive motor is obtained.

7. A power control system for limiting the power of a power system, characterized in that: include: The acquisition module is configured to acquire operating condition parameters, wherein the operating condition parameters include battery management parameters and energy management parameters, the battery management parameters are used to characterize the power limit of the battery, and the energy management parameters are used to characterize the power generated during vehicle operation; The filtering module is configured to perform filtering processing based on the energy management parameters to obtain the filtering parameters; The calculation module is configured to determine the power boundary of the power system to avoid overcharging or over-discharging of the battery based on the filtering parameters, battery management parameters, and energy management parameters. The battery management parameters include the maximum available charging power boundary of the battery; the energy management parameters include the actual total power of the drive motor; the filtering parameters include the filtered actual total power of the drive motor obtained by filtering the actual total power of the drive motor; and the power system boundary includes the target power generation boundary of the range extender. The step of determining the power system boundary to avoid battery overcharging or over-discharging includes: determining the target power generation boundary of the range extender based on the maximum available charging power boundary of the battery, the filtered actual total power of the drive motor, and the actual total power of the drive motor. The step of determining the target power generation boundary of the range extender based on the maximum available charging power boundary of the battery, the filtered actual total power of the drive motor, and the actual total power of the drive motor includes: calculating the difference between the filtered actual total power of the drive motor and a first reserved power to obtain a first difference; obtaining a first smaller value based on the smaller of the first difference and the actual total power of the drive motor; calculating the difference between the maximum available charging power boundary of the battery and a second reserved power to obtain a second difference; calculating the difference between the second difference and the high-voltage accessory loss to obtain a third difference; and obtaining the target power generation boundary of the range extender based on the difference between the first smaller value and the third difference.

8. A readable storage medium, characterized in that, The readable storage medium stores at least one instruction or program, which is loaded and executed by a processor to implement the power control method for limiting the power system as described in any one of claims 1 to 6.

9. A controller, characterized in that: Including the processor and memory; The memory is used to store programs; The processor is configured to execute, according to the program, the power control method for limiting a power system as described in any one of claims 1 to 6.

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