Electric drive limiting frequency control method, device, equipment and computer readable storage medium
By acquiring road condition information of the road segment where the electric vehicle is to be driven, determining the road condition category, and adjusting the switching frequency of the motor controller, the problem of increased heat and energy loss caused by high frequency of the motor controller is solved, thereby improving electric drive efficiency and enhancing range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHIRUI SEMICON CO LTD
- Filing Date
- 2023-10-25
- Publication Date
- 2026-07-03
Smart Images
Figure CN117445687B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of computer technology, specifically to an electric drive frequency limiting control method, apparatus, device, and computer-readable storage medium. Background Technology
[0002] With the rapid development of automotive electrification technology, electric vehicles have become an indispensable means of transportation. People have increasingly higher requirements for the manufacturing quality of electric vehicles. Among these, noise, vibration, and harshness (NVH) performance is a comprehensive issue related to the manufacturing quality of electric vehicles, providing the most direct and immediate experience for users. Currently, the switching frequency of the motor controller is typically kept within a high range to reduce motor vibration frequency and achieve better NVH performance. However, this approach leads to increased heat, greater energy loss, lower electric drive efficiency, and reduced driving range. Summary of the Invention
[0003] This application provides an electric drive frequency limiting control method, device, equipment, and computer-readable storage medium, which can solve the technical problems existing in the prior art, such as maintaining the switching frequency of the motor controller in a high range in order to provide electric vehicle users with a better NVH experience, resulting in increased heat, greater energy loss, low electric drive efficiency, and reduced driving range.
[0004] In a first aspect, embodiments of this application provide an electric drive frequency limiting control method, including:
[0005] Obtain road condition information for the section of road where the electric vehicle is to travel;
[0006] Based on the road condition information, the road condition category is determined;
[0007] Based on the road condition category, determine the switching frequency of the motor controller;
[0008] The electric vehicle is driven based on the switching frequency of the motor controller.
[0009] In some embodiments, the traffic information includes: preset information, and / or, real-time traffic images.
[0010] In some embodiments, the traffic information includes real-time traffic images, and determining the traffic condition category based on the traffic information includes:
[0011] The road surface smoothness is determined based on the real-time traffic images;
[0012] Based on the road surface smoothness, the road condition category is determined.
[0013] In some embodiments, determining the switching frequency of the motor controller based on the road condition category includes:
[0014] Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
[0015] In some embodiments, driving the electric vehicle based on the switching frequency of the motor controller includes:
[0016] Based on the switching frequency of the motor controller, the switching action of the motor controller is controlled so that the motor outputs the corresponding current, thereby driving the electric vehicle.
[0017] Secondly, embodiments of this application provide an electric drive frequency limiting control device, the electric drive frequency limiting control device comprising:
[0018] The acquisition unit is used to acquire road condition information for the section of road where the electric vehicle is to travel;
[0019] The first determining unit is used to determine the road condition category based on the road condition information;
[0020] The second determining unit is used to determine the switching frequency of the motor controller based on the road condition category;
[0021] A drive unit is used to drive the electric vehicle based on the switching frequency of the motor controller.
[0022] In some embodiments, the traffic information includes real-time traffic images, and the first determining unit is specifically used for:
[0023] The road surface smoothness is determined based on the real-time traffic images;
[0024] Based on the road surface smoothness, the road condition category is determined.
[0025] In some embodiments, the second determining unit is specifically used for:
[0026] Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
[0027] Thirdly, embodiments of this application provide an electric drive frequency limiting control device, the electric drive frequency limiting control device including a processor, a memory, and an electric drive frequency limiting control program stored in the memory and executable by the processor, wherein when the electric drive frequency limiting control program is executed by the processor, it implements the steps of the electric drive frequency limiting control method as described in any of the first aspects above.
[0028] Fourthly, embodiments of this application provide a computer-readable storage medium storing an electric drive frequency limiting control program, wherein when the electric drive frequency limiting control program is executed by a processor, it implements the steps of the electric drive frequency limiting control method as described in any of the first aspects above.
[0029] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the electric drive frequency limiting control method as described in any of the first aspects above.
[0030] The beneficial effects of the technical solutions provided in this application include:
[0031] First, road condition information of the route the electric vehicle is to travel is obtained; then, the road condition category is determined based on the road condition information; further, the switching frequency of the motor controller is determined based on the road condition category; then, the electric vehicle is driven based on the switching frequency of the motor controller. This achieves automatic adjustment of the switching frequency of the motor controller according to the road condition category, which can reduce unnecessary energy loss, lower chip temperature, improve electric drive efficiency, and enhance driving range. Attached Figure Description
[0032] Figure 1 This is one of the flowcharts illustrating an electric drive frequency limiting control method provided in an embodiment of this application;
[0033] Figure 2 This is a second schematic flowchart of an electric drive frequency limiting control method provided in one embodiment of this application;
[0034] Figure 3 This is a schematic diagram of the functional modules of an electric drive frequency limiting control device provided in one embodiment of this application;
[0035] Figure 4 This is a schematic diagram of the hardware structure of an electrically driven frequency limiting control device provided in one embodiment of this application. Detailed Implementation
[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0037] In order to provide electric vehicle users with a better NVH experience, the switching frequency of the motor controller is kept in a high range. However, on some bumpy roads, the high switching frequency of the motor controller will not make users have a good NVH experience. Instead, it will lead to increased heat, more energy loss, low electric drive efficiency, and reduced range.
[0038] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0039] In a first aspect, embodiments of this application provide an electric drive frequency limiting control method.
[0040] In some embodiments, refer to Figure 1 , Figure 1 This is one of the flowcharts illustrating an electric drive frequency limiting control method provided in an embodiment of this application, such as... Figure 1 As shown, the electric drive frequency limiting control method includes the following steps:
[0041] Steps 110, 120, 130, and 140. These method steps are merely one possible implementation of this application.
[0042] Step 110: Obtain road condition information for the section of road where the electric vehicle is to travel;
[0043] It should be noted that obtaining road condition information for the route the electric vehicle is about to take allows for adjustments to the switching frequency of the motor controller based on different road conditions, thereby reducing unnecessary energy loss, improving electric drive efficiency, and enhancing driving range.
[0044] The traffic information includes: preset information, and / or, real-time traffic images.
[0045] Optionally, pre-defined information about the route the electric vehicle will travel on can be obtained through online or offline maps, such as mountain roads, highways, and national roads. Alternatively, real-time traffic images of the route can be collected using devices such as cameras, image sensors, and LiDAR mounted on the front of the vehicle. Both methods can also be used simultaneously to obtain traffic information. These two methods can complement each other to provide more accurate traffic information.
[0046] It should be noted that this application does not specify the method for obtaining preset information and real-time traffic images.
[0047] Step 120: Determine the road condition category based on the road condition information;
[0048] Furthermore, based on the road condition information, the road condition category is determined to prepare for determining the switching frequency of the motor controller. The road condition categories include, but are not limited to: normal road sections, bumpy road sections, and smooth road sections.
[0049] In some embodiments, the traffic information includes real-time traffic images. Figure 2 This is a second schematic flowchart of an electric drive frequency limiting control method provided in one embodiment of this application, as shown below. Figure 2 As shown, step 120 includes:
[0050] Step 210: Determine the road surface smoothness based on the real-time road condition image;
[0051] Step 220: Determine the road condition category based on the road surface smoothness.
[0052] In practical implementation, the road surface smoothness can be determined based on the height difference between the highest and lowest points of the road surface in the real-time traffic image. Further, after determining the road surface smoothness based on the height difference between the highest and lowest points in the real-time traffic image, it is then determined whether the road surface smoothness falls within a first preset threshold range, thereby determining the road condition category. The first preset threshold range can be flexibly set according to actual needs. For example, if the height difference between the highest and lowest points in the real-time traffic image is within 5mm, the road condition category is a smooth road section; if the height difference between the highest and lowest points in the real-time traffic image is between 5mm and 10mm, the road condition category is a normal road section; if the height difference between the highest and lowest points in the real-time traffic image is greater than 10mm, the road condition category is a bumpy road section.
[0053] In this embodiment of the application, the road surface smoothness is first determined based on the real-time road condition image, and then the road condition category is determined based on the road surface smoothness, in order to prepare for determining the switching frequency of the motor controller.
[0054] Step 130: Determine the switching frequency of the motor controller based on the road condition category;
[0055] Different switching frequencies of motor controllers are determined for different road conditions, thereby enabling automatic adjustment of the switching action of the motor controllers, reducing unnecessary energy loss, improving electric drive efficiency, and enhancing driving range.
[0056] In some embodiments, step 130 includes:
[0057] Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
[0058] In practical implementation, a correspondence between each road condition category and the switching frequency of the motor controller is pre-established. Optionally, a road condition category can correspond to a specific value or a range of values for the switching frequency of the motor controller. The switching frequency range of the motor controller can be flexibly set according to actual needs. For example, the switching frequency range of the motor controller for smooth road sections can be 9kHz-12kHz; the switching frequency range for general road sections can be 6kHz-9kHz; and the switching frequency range for bumpy road sections can be ≤5kHz.
[0059] Optionally, in the preset correspondence between road condition categories and the switching frequency of the motor controller, if the switching frequency of the motor controller corresponding to the road condition category is a numerical range, the switching frequency corresponding to the road condition category can be randomly determined within the numerical range, preferably the upper limit of the numerical range.
[0060] In this embodiment, the switching frequency corresponding to the road condition category is determined based on the preset correspondence between road condition categories and the switching frequency of the motor controller. This can significantly reduce unnecessary energy loss, improve electric drive efficiency, and enhance driving range.
[0061] Step 140: Drive the electric vehicle based on the switching frequency of the motor controller.
[0062] In practical implementation, since switching losses are directly proportional to switching frequency, after determining the switching frequency of the motor controller, driving the electric vehicle based on the switching frequency of the motor controller can effectively reduce energy loss and make the electric drive more efficient.
[0063] To verify the effectiveness of the electric drive frequency limiting control method provided in this application, simulation analysis was performed on the electric drive system with the motor controller switching frequencies of 12kHz and 4kHz, respectively. The same input conditions were used: voltage 480V, output current 442A, output frequency 200Hz, power factor 0.8, and modulation ratio 0.85. At a motor controller switching frequency of 12kHz, the electric drive efficiency was 98.16%, the total energy loss of the power module's insulated-gate bipolar transistor (IGBT) and fast recovery diode (FRD) was 606.7W, and the highest chip temperature was 152℃. At a motor controller switching frequency of 4kHz, the electric drive efficiency was 98.92%, the total energy loss of the power module's IGBT and FRE was 356.5W, and the highest chip temperature was 115.8℃. Therefore, using electric drive frequency limiting results in higher electric drive efficiency, less energy loss, lower chip temperature, and longer driving range.
[0064] In this embodiment, the road condition information of the road segment to be driven by the electric vehicle is first obtained; and the road condition category is determined based on the road condition information; further, the switching frequency of the motor controller is determined according to the road condition category; then, the electric vehicle is driven based on the switching frequency of the motor controller, so as to realize the automatic adjustment of the switching frequency of the motor controller according to the road condition category, which can reduce unnecessary energy loss, reduce chip temperature, improve electric drive efficiency, and improve range.
[0065] In some embodiments, driving the electric vehicle based on the switching frequency of the motor controller includes:
[0066] Based on the switching frequency of the motor controller, the switching action of the motor controller is controlled so that the motor outputs the corresponding current, thereby driving the electric vehicle.
[0067] In practical implementation, the switching action of the motor controller is controlled based on the switching frequency of the motor controller, so that the motor outputs three-phase AC power corresponding to the switching frequency of the motor controller, thereby driving the electric vehicle.
[0068] In this embodiment, the switching action of the motor controller is controlled based on the switching frequency of the motor controller so that the motor can output the corresponding current to drive the electric vehicle, thereby reducing unnecessary energy loss and improving electric drive efficiency.
[0069] Secondly, embodiments of this application also provide an electric drive frequency limiting control device.
[0070] In some embodiments, refer to Figure 3 , Figure 3 This is a functional block diagram of an electrically driven frequency limiting control device provided in one embodiment of this application. Figure 3 As shown, the electric drive frequency limiting control device includes:
[0071] The acquisition unit 310 is used to acquire road condition information of the road segment where the electric vehicle is to travel;
[0072] The first determining unit 320 is used to determine the road condition category based on the road condition information;
[0073] The second determining unit 330 is used to determine the switching frequency of the motor controller according to the road condition category;
[0074] The drive unit 340 is used to drive the electric vehicle based on the switching frequency of the motor controller.
[0075] In some embodiments, the traffic information includes: preset information, and / or, real-time traffic images.
[0076] In some embodiments, the traffic information includes real-time traffic images, and the first determining unit 320 is specifically used for:
[0077] The road surface smoothness is determined based on the real-time traffic images;
[0078] Based on the road surface smoothness, the road condition category is determined.
[0079] In some embodiments, the second determining unit 330 is specifically used for:
[0080] Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
[0081] In some embodiments, the driving unit 340 is specifically used for:
[0082] Based on the switching frequency of the motor controller, the switching action of the motor controller is controlled so that the motor outputs the corresponding current, thereby driving the electric vehicle.
[0083] It should be noted that the electric drive frequency limiting control device provided in this application embodiment can implement all the method steps implemented in the above-mentioned electric drive frequency limiting control method embodiment, and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.
[0084] It should be noted that each implementation method of this application can be freely combined, rearranged, or executed individually, and does not need to rely on or depend on a fixed execution order.
[0085] Thirdly, embodiments of this application provide an electric drive frequency limiting control device, which can be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.
[0086] Reference Figure 4 , Figure 4 This is a schematic diagram of the hardware structure of an electric drive frequency limiting control device according to one embodiment of this application. In this embodiment, the electric drive frequency limiting control device may include a processor, a memory, a communication interface, and a communication bus.
[0087] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.
[0088] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting devices within the electric drive frequency limiting control equipment, as well as interfaces used for interconnecting the electric drive frequency limiting control equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.
[0089] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.
[0090] The processor can be a general-purpose processor, which can call the electric drive frequency limiting control program stored in the memory and execute the electric drive frequency limiting control method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the electric drive frequency limiting control program is called can be referred to in the various embodiments of the electric drive frequency limiting control method of this application, and will not be repeated here.
[0091] Those skilled in the art will understand that Figure 4The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.
[0092] Fourthly, embodiments of this application also provide a computer-readable storage medium.
[0093] The present application has a computer-readable storage medium storing an electric drive frequency limiting control program, wherein when the electric drive frequency limiting control program is executed by a processor, it implements the steps of the electric drive frequency limiting control method described above.
[0094] The method implemented when the electric drive frequency limiting control program is executed can be referred to in various embodiments of the electric drive frequency limiting control method of this application, and will not be repeated here.
[0095] Fifthly, embodiments of this application also provide a computer program product.
[0096] The computer program product provided in this application includes a computer program that can be stored on a computer-readable storage medium. When the electric drive frequency limiting control program is executed by a processor, it implements the steps of the electric drive frequency limiting control method described above.
[0097] The method implemented when the electric drive frequency limiting control program is executed can be referred to in various embodiments of the electric drive frequency limiting control method of this application, and will not be repeated here.
[0098] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0099] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.
[0100] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.
[0101] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.
[0102] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.
[0103] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.
[0104] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. An electric drive frequency limiting control method, characterized by, The electric drive frequency limiting control method includes: Obtain road condition information for the section of road where the electric vehicle is to travel; Based on the road condition information, the road condition category is determined; Based on the road condition category, determine the switching frequency of the motor controller; The electric vehicle is driven based on the switching frequency of the motor controller; The traffic information includes: preset information, and / or, real-time traffic images; The traffic information includes real-time traffic images, and the determination of the traffic condition category based on the traffic information includes: The road surface smoothness is determined based on the real-time traffic images; Based on the road surface smoothness, the road condition category is determined.
2. The electric drive limit frequency control method of claim 1, wherein, Determining the switching frequency of the motor controller based on the road condition category includes: Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
3. The electric drive frequency limiting control method as described in claim 1, characterized in that, The method of driving the electric vehicle based on the switching frequency of the motor controller includes: Based on the switching frequency of the motor controller, the switching action of the motor controller is controlled so that the motor outputs the corresponding current, thereby driving the electric vehicle.
4. An electrically driven frequency limiting control device, characterized in that, The electric drive frequency limiting control device includes: The acquisition unit is used to acquire road condition information for the section of road where the electric vehicle is to travel; The first determining unit is used to determine the road condition category based on the road condition information; The second determining unit is used to determine the switching frequency of the motor controller based on the road condition category; A drive unit is used to drive the electric vehicle based on the switching frequency of the motor controller; The traffic information includes: preset information, and / or, real-time traffic images; The traffic information includes real-time traffic images, and the first determining unit is specifically used for: The road surface smoothness is determined based on the real-time traffic images; Based on the road surface smoothness, the road condition category is determined.
5. The electric drive frequency limiting control device as described in claim 4, characterized in that, The second determining unit is specifically used for: Based on the preset correspondence between road condition categories and the switching frequency of the motor controller, the switching frequency corresponding to the road condition category is determined.
6. An electrically driven frequency limiting control device, characterized in that, The electric drive frequency limiting control device includes a processor, a memory, and an electric drive frequency limiting control program stored in the memory and executable by the processor, wherein when the electric drive frequency limiting control program is executed by the processor, it implements the steps of the electric drive frequency limiting control method as described in any one of claims 1 to 3.
7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an electric drive frequency limiting control program, wherein when the electric drive frequency limiting control program is executed by a processor, it implements the steps of the electric drive frequency limiting control method as described in any one of claims 1 to 3.