New energy vehicle external characteristic control method, device and equipment and storage medium

Abstract

The invention discloses a new energy vehicle external characteristic control method, device and equipment and a storage medium, relates to the technical field of motor performance, and discloses a new energy vehicle external characteristic control method which comprises the steps that the current vehicle speed, the current accelerator pedal opening degree and the current wheel side torque are obtained; when the preset torque control switch is in the on state, whether the current vehicle speed and the current accelerator pedal opening degree trigger a preset torque detection condition or not is determined; when a preset torque detection condition is triggered, torque fluctuation information is determined based on the current wheel side torque; and when the fluctuation range of the torque fluctuation information is larger than a first preset fluctuation threshold value, the external characteristic torque is reduced with a preset adjustment amount until the fluctuation range of the torque fluctuation information is smaller than a second preset fluctuation threshold value, so that external characteristic control over the new energy vehicle is completed, and the second preset fluctuation threshold value is smaller than the first preset fluctuation threshold value. According to the scheme, under the condition that the power performance of the whole vehicle is guaranteed, torque fluctuation is restrained to eliminate the pause impact feeling.

Description

Technical Field

[0001] This application relates to the field of motor performance technology, and in particular to methods, devices, equipment and storage media for controlling the external characteristics of new energy vehicles. Background Technology

[0002] Improving the driving comfort of battery electric vehicles (BEVs) can not only enhance the user experience, but also effectively improve the ride quality for passengers who are more sensitive to vibration and noise, such as the elderly and children.

[0003] Currently, the vehicle controller, based on a preset external characteristic table, outputs a torque request command according to the current operating conditions. This command is then executed by the motor controller, which provides feedback on the actual torque. When the vehicle reaches its maximum speed, the torque value corresponding to the end of the external characteristic curve is excessively high. This torque fluctuation, transmitted through the transmission system to the wheels, results in noticeable torque fluctuations. This manifests as periodic jerking and jolts during constant-speed driving, reducing driving comfort and potentially affecting driving safety. Therefore, how to suppress torque fluctuations and eliminate jerking and jolts while maintaining overall vehicle power performance remains a problem to be solved.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a method, device, equipment and storage medium for controlling the external characteristics of new energy vehicles, aiming to solve the technical problem of how to suppress torque fluctuations and eliminate jerking and shock sensations while ensuring the overall power performance of the vehicle.

[0006] To achieve the above objectives, this application proposes a method for controlling the external characteristics of a new energy vehicle, the method comprising: Get the current vehicle speed, current accelerator pedal opening, and current wheel torque; When the preset torque control switch is in the on state, determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition; When the preset torque detection condition is triggered, torque fluctuation information is determined based on the current wheel-side torque; When the fluctuation range of the torque fluctuation information is greater than the first preset fluctuation threshold, the external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle. The second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0007] In one embodiment, the step of reducing the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold includes: Based on the current motor speed, the corresponding external characteristic torque is obtained by querying the external characteristic torque table. The external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold when the current vehicle speed and the current accelerator pedal opening meet the preset torque detection conditions.

[0008] In one embodiment, after the step of reducing the external characteristic torque by a preset adjustment amount when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, until the fluctuation range of the torque fluctuation information is less than a second preset threshold, the method further includes: If the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, the current wheel-side torque after the adjustment is obtained; The target external characteristic torque is calculated based on the reduced current wheel-side torque, and the external characteristic torque is updated in the external characteristic torque table; The external characteristic torque is determined to be the torque requested for the target vehicle speed.

[0009] In one embodiment, the step of determining the external characteristic torque as the target vehicle speed requested torque includes: When the preset torque control switch is the economy mode torque control switch, the external characteristic torque is determined to be the target vehicle speed requested torque in economy mode; When the preset torque control switch is the motion mode torque control switch, the external characteristic torque is determined to be the target vehicle speed request torque in motion mode.

[0010] In one embodiment, after the step of reducing the external characteristic torque by a preset adjustment amount, the method further includes: Acquire instantaneous power, battery output power, and updated accelerator pedal opening information; Determine whether the instantaneous power, the battery output power, and the updated accelerator pedal opening change information meet the preset driving safety conditions; If the preset driving safety conditions are not met, the operation of reducing the external characteristic torque will stop, and an external characteristic control error message will be displayed.

[0011] In one embodiment, the step of acquiring instantaneous power, battery output power, and updated accelerator pedal opening change information includes: Get updated current wheel torque, updated accelerator pedal opening, battery bus voltage, and battery bus current; Instantaneous power is calculated based on the updated current wheel-side torque and current motor speed; The battery output power is calculated based on the battery bus voltage and the battery bus current; The updated accelerator pedal opening change information is determined based on the updated accelerator pedal opening.

[0012] In one embodiment, the step of determining whether the current vehicle speed and the current accelerator pedal opening trigger a preset torque detection condition includes: The current vehicle speed is compared with a preset vehicle speed threshold to obtain the vehicle speed determination result; Accelerator pedal opening change information is determined based on the current accelerator pedal opening and the historical accelerator pedal opening. Based on the vehicle speed determination result and the accelerator pedal opening change information, it is determined whether to trigger the preset torque detection condition.

[0013] Furthermore, to achieve the above objectives, this application also proposes a new energy vehicle external characteristic control device, which includes: The data acquisition module is used to acquire the current vehicle speed, current accelerator pedal opening, and current wheel torque; The condition judgment module is used to determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition when the preset torque control switch is in the on state. The torque monitoring module is used to determine torque fluctuation information based on the current wheel-side torque when the preset torque detection condition is triggered; The torque control module is used to reduce the external characteristic torque by a preset adjustment amount when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0014] In addition, to achieve the above objectives, this application also proposes a new energy vehicle external characteristic control device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the new energy vehicle external characteristic control method described above.

[0015] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the new energy vehicle external characteristic control method described above.

[0016] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the new energy vehicle external characteristic control method described above.

[0017] One or more technical solutions proposed in this application have at least the following technical effects: By acquiring the current vehicle speed, current accelerator pedal opening, and current wheel torque when the preset torque control switch is turned on, and combining the current vehicle speed and current accelerator pedal opening to determine whether the preset torque detection condition is triggered, the operating conditions that need torque optimization can be accurately screened out without affecting the power performance under other operating conditions, thus ensuring the overall vehicle power performance. When the detection condition is triggered, the torque fluctuation information is determined based on the current wheel torque. According to the comparison between the torque fluctuation range and the preset threshold, the external characteristic torque is adjusted down by a fixed amount until the fluctuation range meets the requirements. This can effectively solve the problem of excessive wheel torque fluctuation at the maximum vehicle speed, which causes jerking and impact, and keeps the torque fluctuation within a small range. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating an embodiment of the new energy vehicle external characteristic control method of this application. Figure 2 A schematic diagram of torque variation over time under high-speed conditions provided in Embodiment 1 of the new energy vehicle external characteristic control method of this application; Figure 3 This is a flowchart illustrating Embodiment 2 of the new energy vehicle external characteristic control method of this application; Figure 4 This is a schematic diagram of the module structure of the new energy vehicle external characteristic control device according to an embodiment of this application; Figure 5 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the new energy vehicle external characteristic control method in the embodiments of this application.

[0021] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0023] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The main solution of this application embodiment is as follows: acquire the current vehicle speed, the current accelerator pedal opening, and the current wheel torque; when the preset torque control switch is in the on state, determine whether the current vehicle speed and the current accelerator pedal opening trigger a preset torque detection condition; when the preset torque detection condition is triggered, determine torque fluctuation information based on the current wheel torque; when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, reduce the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0025] Currently, the vehicle controller, based on a preset external characteristic table, outputs a torque request command according to the current operating conditions. This command is then executed by the motor controller, which in turn feeds back the actual torque. When the vehicle reaches its maximum speed, the torque value corresponding to the end of the external characteristic curve is excessively high. This torque fluctuation, transmitted through the transmission system to the wheels, results in noticeable torque fluctuations. This manifests as periodic jerking and jolts during constant-speed driving, reducing driving comfort and potentially affecting driving safety. Therefore, how to suppress torque fluctuations and eliminate jerking and jolts while maintaining overall vehicle power performance remains a problem to be solved.

[0026] This application provides a solution that acquires the current vehicle speed, current accelerator pedal opening, and current wheel torque when a preset torque control switch is activated. By combining the current vehicle speed and current accelerator pedal opening, it determines whether a preset torque detection condition is triggered. This accurately identifies operating conditions requiring torque optimization without affecting the power performance under other operating conditions, thus ensuring the overall vehicle power performance. When the detection condition is triggered, torque fluctuation information is determined based on the current wheel torque. By comparing the torque fluctuation range with a preset threshold, the external characteristic torque is adjusted down by a fixed amount until the fluctuation range meets the requirements. This effectively solves the problem of excessive wheel torque fluctuation at maximum vehicle speed, causing jerking and impact, and keeps torque fluctuation within a small range.

[0027] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, such as a new energy vehicle external characteristic control device. The following description uses a new energy vehicle external characteristic control device as an example to illustrate this embodiment and the subsequent embodiments.

[0028] Based on this, embodiments of this application provide a method for controlling the external characteristics of a new energy vehicle, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the new energy vehicle external characteristic control method of this application.

[0029] In this embodiment, the method for controlling the external characteristics of new energy vehicles includes steps S10 to S40: Step S10: When the preset torque control switch is in the on state, obtain the current vehicle speed, the current accelerator pedal opening and the current wheel torque; It should be noted that for some low-power models, the initial external characteristics data are usually calibrated based on the maximum power. Therefore, the torque related to the external characteristics caused by the maximum vehicle speed is excessively high. At the maximum speed, the excessive torque transmitted to the wheels causes fluctuations, jerks, and jolts, which manifest as a cyclic wave pattern in the report, leading to driving comfort issues. The external characteristics (i.e., the external performance of the drive system) of pure electric new energy vehicles are mainly reflected in their power output, efficiency, and response speed. The external characteristics of pure electric vehicles are jointly determined by the motor, battery, and electronic control system, and their design often focuses on efficiency and response during daily driving, rather than extreme high-speed performance.

[0030] In addition, the current vehicle speed refers to the speed at which the vehicle is traveling at the moment the data is acquired. It can be obtained through the vehicle speed sensor, and its value can reflect the current speed of the vehicle.

[0031] Additionally, the current accelerator pedal opening refers to the extent to which the driver presses the accelerator pedal at the current moment. It is obtained through the accelerator pedal sensor and can reflect the driver's acceleration intention. Its state includes increasing, remaining unchanged, and decreasing opening.

[0032] In addition, the current wheel torque refers to the actual torque transmitted to the wheels at the current moment after the torque of the drive motor passes through the entire transmission system of the vehicle (including single-stage reducer, differential, half shaft, etc.), and is a direct reflection of the actual driving force of the vehicle.

[0033] It should be understood that the vehicle speed sensor can collect the current vehicle speed, the accelerator pedal sensor can collect the current accelerator pedal opening, and the wheel torque at the current moment can be obtained.

[0034] Step S20: Determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition; It should be noted that the preset torque control switch is a calibrated switch used to control the activation and deactivation of the external characteristic torque adjustment function. This switch has two states, 0 and 1. 0 represents the external characteristic torque adjustment function being deactivated, and 1 represents the external characteristic torque adjustment function being activated.

[0035] In addition, the preset torque detection conditions are pre-set conditions used to determine whether wheel torque needs to be detected. These conditions are related to the current vehicle speed and the current accelerator pedal opening. Only when these two parameters meet specific requirements will further detection of wheel torque be triggered to filter out the working conditions that need torque optimization and avoid unnecessary detection operations in working conditions that do not require adjustment.

[0036] It should be understood that the status of the preset torque control switch must first be confirmed. Only when this switch is in the on state (marked as 1) will the system analyze whether the current vehicle speed and current accelerator pedal opening meet the preset torque detection conditions based on preset judgment rules. If the conditions are met, the subsequent torque detection steps will proceed; otherwise, subsequent torque-related detection will not be performed.

[0037] In one feasible implementation, step S20 may include steps S21 to S23: Step S21: Compare the current vehicle speed with a preset vehicle speed threshold to obtain a vehicle speed determination result; It should be noted that the preset vehicle speed threshold is a pre-set speed standard used to determine whether the vehicle speed has reached high-speed operating conditions. This threshold is set based on the need to address torque fluctuation issues at maximum vehicle speed. For example, for external characteristic control scenarios related to maximum vehicle speed, the preset vehicle speed threshold can be 100 km / h.

[0038] Additionally, the vehicle speed determination result refers to the conclusion drawn after comparing the current vehicle speed with the preset vehicle speed threshold, including two cases: the current vehicle speed is greater than or equal to the preset vehicle speed threshold and the current vehicle speed is less than the preset vehicle speed threshold.

[0039] It should be understood that after obtaining the current vehicle speed, it is compared with a preset vehicle speed threshold. If the current vehicle speed is greater than or equal to the preset vehicle speed threshold, the vehicle speed judgment result meets the requirements for triggering the preset torque detection condition under this dimension; if the current vehicle speed is less than the preset vehicle speed threshold, the vehicle speed judgment result does not meet the requirements for triggering the preset torque detection condition under this dimension.

[0040] Step S22: Determine the accelerator pedal opening change information based on the current accelerator pedal opening and the historical accelerator pedal opening; It should be noted that historical accelerator pedal opening refers to the accelerator pedal opening recorded at the moment before the current accelerator pedal opening is acquired. This data is stored and used for comparative analysis with the current data. Accelerator pedal opening change information refers to the trend and state of the current accelerator pedal opening, obtained by comparing the current accelerator pedal opening with the historical accelerator pedal opening. This includes three scenarios: opening increase, opening remain unchanged, and opening decrease. This information reflects changes in the driver's acceleration intention.

[0041] It should be understood that historical accelerator pedal openings are retrieved from stored historical data, and the current accelerator pedal opening is compared with the historical accelerator pedal opening to analyze whether the current opening is increasing, remaining unchanged, or decreasing relative to the historical opening, thereby determining the information on changes in accelerator pedal opening.

[0042] Step S23: Based on the vehicle speed judgment result and the accelerator pedal opening change information, determine whether to trigger the preset torque detection condition.

[0043] It should be noted that the vehicle speed determination result is the basis for determining whether the preset torque detection condition is triggered, while the accelerator pedal opening change information is the basis for determining whether the preset torque detection condition is triggered. The preset torque detection condition will only be triggered when both the vehicle speed determination result and the accelerator pedal opening change information meet specific requirements.

[0044] It should be understood that, based on a comprehensive analysis of the vehicle speed judgment result and the accelerator pedal opening change information, if the vehicle speed judgment result indicates that the current vehicle speed is greater than or equal to a preset vehicle speed threshold (e.g., 100 km / h), and the accelerator pedal opening change information shows that the opening has not decreased (i.e., the opening has increased or remained unchanged), then the preset torque detection condition is determined to be triggered; if any one of these conditions is not met, such as the current vehicle speed being less than the preset vehicle speed threshold, or the accelerator pedal opening decreasing, then the preset torque detection condition is determined not to be triggered.

[0045] Step S30: When the preset torque detection condition is triggered, determine torque fluctuation information based on the current wheel-side torque; It should be noted that this step will only be executed when the current vehicle speed and current accelerator pedal opening meet the preset torque detection conditions. Torque fluctuation information refers to the change in the current wheel-side torque over a period of time from the triggering of the preset torque detection conditions to the current moment, including the range and frequency of torque changes.

[0046] It should be understood that once the preset torque detection conditions are triggered, the torque fluctuation will be calculated based on the current wheel-side torque and the wheel-side torque data collected and analyzed over a period of time, thus generating torque fluctuation information.

[0047] Step S40: When the fluctuation range of the torque fluctuation information is greater than the first preset fluctuation threshold, the external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0048] It should be noted that the fluctuation range of torque fluctuation information refers to the numerical range of wheel-side torque changes over a period of time. The first preset fluctuation threshold is the critical value for determining whether to start reducing the external characteristic torque. When the torque fluctuation range exceeds this threshold, it indicates that the current torque fluctuation is too large, which will affect driving comfort and requires adjustment. The preset adjustment amount refers to the fixed adjustment value each time the external characteristic torque is reduced. For example, the preset adjustment amount can be 1N, that is, the external characteristic torque is reduced by 1N each time it is adjusted.

[0049] Additionally, external characteristic torque refers to the output torque of the drive motor at a specific speed. It is a set value for the motor's performance. Different vehicles have different motor torque capabilities, and their factory-set external characteristic torques are different. The value of this external characteristic torque will directly affect the magnitude of the wheel-side torque. A decrease in external characteristic torque will cause a corresponding change in the wheel-side torque.

[0050] Additionally, the second preset fluctuation threshold is a critical value for determining whether the external characteristic torque adjustment is complete. When the torque fluctuation range is less than the second preset fluctuation threshold, it indicates that the torque fluctuation is within a reasonable range, ensuring driving comfort. For example, the second preset fluctuation threshold can be 2N, meaning the wheel-side torque fluctuation is required to not exceed 2N. The second preset fluctuation threshold needs to be less than the first preset fluctuation threshold to ensure that the adjusted torque fluctuation is smaller.

[0051] In addition, the control of external characteristics of new energy vehicles refers to optimizing the vehicle's power output performance by adjusting relevant parameters of external characteristics (such as external characteristic torque), solving problems that affect driving comfort, and improving vehicle performance.

[0052] For example, Figure 2 This is a schematic diagram illustrating the torque variation over time under high-speed conditions, provided in Embodiment 1 of the new energy vehicle external characteristic control method of this application. Figure 2 As shown, the horizontal axis represents time (unit: seconds), and the vertical axis is a composite axis that represents two different physical quantities: vehicle speed (unit: km / h) and torque (unit: Nm). When the vehicle maintains its maximum speed (i.e., greater than a preset speed threshold such as 100 km / h), the motor output torque, i.e., the wheel-side torque, fluctuates between 21 N and 33 N, resulting in noticeable vehicle vibration and causing driving discomfort.

[0053] It should be understood that the fluctuation range of the torque fluctuation information is first compared with a first preset fluctuation threshold. If the fluctuation range is greater than the first preset fluctuation threshold, the external characteristic torque is reduced by a preset adjustment amount (e.g., 1N). After each reduction in the external characteristic torque, the wheel-side torque within a preset time period (e.g., 45s) from the start of the reduction is acquired, and new torque fluctuation information is determined. The new fluctuation range is then compared with a second preset fluctuation threshold. If it is greater than the second preset fluctuation threshold, the external characteristic torque is further reduced by a preset adjustment amount. This process is repeated until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, thus completing the external characteristic torque control.

[0054] In one feasible implementation, step S40, which involves reducing the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, may include steps A10 to A20: Step A10: Based on the current motor speed, query the external characteristic torque table to obtain the corresponding external characteristic torque; It should be noted that the current motor speed refers to the rotational speed of the driving motor at the current moment. Different motor speeds correspond to different output capabilities of the motor, and its value can be obtained through the Motor Control Unit (MCU). The external characteristic torque table is a motor speed-motor torque table stored in the vehicle control system. The table records the matching relationship between different motor speeds and corresponding external characteristic torques, and also includes related information such as vehicle speed and power.

[0055] The vehicle speed can be obtained by relating the motor speed, rolling radius, and speed ratio. Specifically, the vehicle speed V can be related by the following formula:

[0056] In the formula, n represents the motor speed; r represents the rolling radius; and i represents the total reduction ratio of the entire transmission system from the motor output shaft to the wheel. The transmission path can be in the following order: motor, single-stage reducer, differential, half-shaft, wheel. i mainly refers to the fixed transmission ratio of the single-stage reducer. In a real vehicle case, i = 13.96.

[0057] In addition, power is related to wheel torque and motor speed. Specifically, power, wheel torque and motor speed can be related by the following equation: Power P = Wheel torque * Motor speed / 9550.

[0058] For example, Table 1 is the initial external characteristic torque table of a 70kW passenger car. The columns are motor speed (unit: rpm), external characteristic torque (unit: rpm), vehicle speed (unit: km / h), and power (unit: kW). The torque of 55.69N at the highest vehicle speed in the initial external characteristic table is too large.

[0059] Table 1

[0060] It should be understood that the current motor speed can be obtained through the motor controller, and the current motor speed can be used to search in the pre-stored external characteristic torque table to find the table entry that matches or is closest to the current motor speed, and the corresponding external characteristic torque value can be extracted from that entry.

[0061] Step A20: Adjust the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold when the current vehicle speed and the current accelerator pedal opening meet the preset torque detection conditions.

[0062] It should be noted that the preset adjustment amount refers to the fixed adjustment value used each time the external characteristic torque is reduced. Only when the current vehicle speed and the current accelerator pedal opening still simultaneously meet the preset torque detection conditions can it be said that the current operating condition is still in a scenario where torque fluctuation needs to be optimized, and further adjustment is of practical significance.

[0063] It should be understood that the acquired external characteristic torque is first adjusted downwards by a preset adjustment amount (e.g., 1N) to obtain the external characteristic torque after the first adjustment. Simultaneously, it is monitored whether the current vehicle speed meets the speed requirement in the preset torque detection conditions and whether the current accelerator pedal opening meets the opening requirement in the preset torque detection conditions. If either does not meet the requirements, the downward adjustment operation is paused until the conditions are met again before continuing. If both meet the requirements, the change data of the adjusted wheel-side torque is further acquired, and the torque fluctuation information is analyzed to determine whether the fluctuation range of this torque fluctuation information is less than a second preset fluctuation threshold. If the fluctuation range is still greater than or equal to the second preset fluctuation threshold, the above operation process of adjusting the external characteristic torque, detecting the operating conditions, and analyzing the torque fluctuation is repeated. If the fluctuation range is less than the second preset fluctuation threshold, the downward adjustment operation is stopped, completing the adjustment process of the external characteristic torque.

[0064] In one feasible implementation, after step S40, which involves adjusting the external characteristic torque by a preset adjustment amount, steps B10 to B30 may also be included: Step B10: Obtain instantaneous power, battery output power, and updated accelerator pedal opening change information; It should be noted that instantaneous power refers to the instantaneous output power of the vehicle's powertrain, reflecting the real-time workload of the powertrain and used to determine whether the powertrain is operating safely. Battery output power refers to the instantaneous power supplied by the battery pack, reflecting the real-time operating status of the battery and used to determine whether the battery is operating safely. Updated accelerator pedal opening change information refers to the changes in driver's operating intention determined based on the updated accelerator pedal opening, including three states: increased opening, unchanged opening, and decreased opening, reflecting the driver's current operating needs and used to determine whether the adjusted operation meets the driver's intention.

[0065] In one feasible implementation, step B10 may include steps B11 to B14: Step B11: Obtain the updated current wheel torque, updated accelerator pedal opening, battery bus voltage, and battery bus current; It should be noted that the updated current wheel-side torque refers to the actual torque transmitted to the wheel at the current moment after the external characteristic torque has been reduced by a preset adjustment amount. It can reflect the actual impact of the reduction in external characteristic torque on the wheel-side torque and is obtained through the corresponding torque detection device.

[0066] Additionally, the updated accelerator pedal opening refers to the amount of the driver pressing the accelerator pedal at the current moment during the adjustment of the external characteristic torque. Since the driver's operation may change over time, this parameter needs to be updated in real time to accurately reflect the driver's current acceleration intention, and is obtained through the accelerator pedal sensor.

[0067] Additionally, the battery bus voltage refers to the voltage of the main circuit inside the battery pack. Its value affects the calculation of battery output power and is collected by voltage sensors in the battery management system. The battery bus current refers to the current flowing in the main circuit of the battery pack. Together with the battery bus voltage, it determines the battery output power and is collected by current sensors in the battery management system.

[0068] It should be understood that after one or more external characteristic torque reduction operations are completed, in order to assess the impact of the adjustment operation on the safe operation of the vehicle, it is necessary to collect the updated current wheel-side torque, updated accelerator pedal opening, battery bus voltage and battery bus current through the corresponding sensors to make subsequent safety judgments and avoid misjudgment of safety risks.

[0069] Step B12: Calculate the instantaneous power based on the updated current wheel-side torque and current motor speed; It should be understood that after obtaining the updated current wheel torque and current motor speed, the instantaneous power is calculated based on the established relationship between the two (i.e., power P = wheel torque * motor speed / 9550). The instantaneous power value allows for a quick determination of whether the power system is operating within a safe range. If there is a risk of exceeding the power limit, adjustments must be terminated promptly to ensure the safety of the power system.

[0070] Step B13: Calculate the battery output power based on the battery bus voltage and the battery bus current; It should be understood that after obtaining the battery bus voltage and battery bus current, the battery output power can be calculated according to the established correlation between the two, thereby determining whether the battery is operating at overpower. This provides a battery-level basis for the subsequent judgment of preset driving safety conditions, ensuring that the battery operates within a safe range.

[0071] For example, the formula for calculating the battery output power P is as follows: P=UI In the formula, U represents the vehicle battery bus voltage, and I represents the battery pack bus current.

[0072] Step B14: Determine updated accelerator pedal opening change information based on the updated accelerator pedal opening.

[0073] It should be understood that after obtaining the updated accelerator pedal opening, the system retrieves historical accelerator pedal openings recorded before the adjustment from its stored historical data. The updated current opening is then compared and analyzed with the historical opening to determine whether the current opening shows an increasing, unchanged, or decreasing trend relative to the historical opening. This determines the updated accelerator pedal opening change information. In this way, changes in the driver's operating intentions can be captured in a timely manner, providing a reference in the dimension of operating intention for subsequent judgments on whether preset driving safety conditions are met, ensuring that the external torque adjustment matches the driver's needs.

[0074] Step B20: Determine whether the instantaneous power, the battery output power, and the updated accelerator pedal opening change information meet the preset driving safety conditions. It should be understood that preset driving safety conditions comprehensively consider the safety of the powertrain system, the safety of the battery system, and the driver's operating intentions. Figure 1 A unified safety standard is set after consistency. When the instantaneous power and battery output power do not exceed the vehicle's rated power, and the updated accelerator pedal opening information shows that the opening has not decreased (i.e., the opening has increased or remained unchanged), the preset driving safety conditions are determined to be met.

[0075] Step B30: If the preset driving safety conditions are not met, stop the operation of reducing the external characteristic torque and display an external characteristic control error message.

[0076] It should be understood that failure to meet preset driving safety conditions means that the vehicle may be experiencing power overload, battery overload, or conditions that do not meet the driver's operational needs. Continuing to reduce the external torque characteristic will exacerbate safety risks or negatively impact the driving experience. Stopping the reduction of external torque characteristic means immediately halting the action of reducing the external torque characteristic by a preset adjustment amount, maintaining the current external torque characteristic value, and not recording the reduced external torque characteristic in the external torque characteristic table. External torque characteristic control error messages are used to prompt the user that there are safety risks or that the current external torque characteristic adjustment process does not meet safety conditions. This information may be presented in a specific way (such as voice prompts, central control screen display, etc.) to inform the user of the reason for stopping the adjustment.

[0077] This embodiment provides a method for controlling the external characteristics of a new energy vehicle. By acquiring the current vehicle speed, current accelerator pedal opening, and current wheel torque when a preset torque control switch is turned on, and comprehensively determining whether a preset torque detection condition is triggered based on the current vehicle speed and current accelerator pedal opening, the method can accurately screen out the operating conditions that require torque optimization without affecting the power performance under other operating conditions, thus ensuring the overall vehicle power performance. When the detection condition is triggered, the method determines the torque fluctuation information based on the current wheel torque, and adjusts the external characteristic torque by a fixed amount according to the comparison between the torque fluctuation range and a preset threshold until the fluctuation range meets the requirements. This can effectively solve the problem of excessive wheel torque fluctuation at the maximum vehicle speed, which causes jerking and impact, and keeps the torque fluctuation within a small range.

[0078] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 After step S40, the new energy vehicle external characteristic control method further includes steps S50~S70: Step S50: If the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, obtain the current wheel-side torque after the adjustment. It should be noted that the current wheel-side torque after the reduction refers to the actual torque transmitted to the wheel at the current moment after the external characteristic torque has been reduced multiple times by the preset adjustment amount. It is a direct result of the external characteristic torque adjustment, and its value directly determines the current driving force and driving stability of the vehicle.

[0079] It should be understood that after multiple reductions in the external characteristic torque, if the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, it indicates that the torque adjustment has achieved the expected effect and the wheel-side torque output is stable. At this time, the wheel-side torque at the current moment is collected by the corresponding torque detection device, which is the current wheel-side torque after the reduction.

[0080] Step S60: Calculate the target external characteristic torque based on the reduced current wheel-side torque, and update the external characteristic torque to the external characteristic torque table; It should be noted that the target external characteristic torque refers to the torque value that the drive motor needs to output at a specific speed to keep the wheel-side torque stable within a reasonable range. This value needs to be calculated by combining the current wheel-side torque after adjustment with a specific correlation.

[0081] Specifically, the relationship between wheel-side torque and external characteristic torque is: Wheel-side torque = External characteristic torque * Proportional * Speed ​​ratio. Here, the proportional is a calibrated value defining the torque to be transmitted from the external characteristic to the wheel-side, and the speed ratio is the total reduction ratio of the entire transmission system from the motor output shaft to the wheel.

[0082] It should be understood that, based on the adjusted current wheel-side torque, combined with the values ​​of the ratio and speed ratio, the corresponding external characteristic torque value is calculated in reverse through the correlation between wheel-side torque and external characteristic torque. After the calculation is completed, the table entry corresponding to the current motor speed (or current vehicle speed) is found in the preset external characteristic torque table, and the original external characteristic torque value in that entry is replaced with the newly calculated target external characteristic torque, thus completing the update of the external characteristic torque table.

[0083] Step S70: Determine that the external characteristic torque is the target vehicle speed requested torque.

[0084] It should be noted that the target vehicle speed refers to the speed at which the external characteristic torque adjustment is currently performed. Specifically, this application targets the highest speed the vehicle can reach, which is greater than a preset speed threshold. At this maximum speed, high torque stability is required, making it a key condition for improving driving comfort. The requested torque is a command-line torque target calculated by the Vehicle Control Unit (VCU) based on factors such as driver intent, current vehicle speed, and driving mode, and sent to the Motor Control Unit (MCU). In other words, it represents the torque value the vehicle controller expects the motor to output. The target speed requested torque is the requested torque set for the target speed condition, i.e., the highest speed condition, to ensure the vehicle can maintain a stable torque output at that speed.

[0085] It should be understood that after calculating the external characteristic torque and updating the external characteristic torque table, this external characteristic torque is determined as the requested torque corresponding to the target vehicle speed. When the vehicle subsequently reaches this target speed, the vehicle controller, when calculating the requested torque, will use this external characteristic torque as a benchmark and send a torque command to the motor controller. This ensures that the actual torque output by the motor matches the external characteristic torque, thereby ensuring that the wheel-side torque remains stable within a fluctuation range less than the second preset fluctuation threshold. This prevents the vehicle from experiencing fluctuations, jerks, and impacts at the target speed, thus continuously guaranteeing driving comfort.

[0086] In one feasible implementation, step S70 may include steps S71-S72: Step S71: When the preset torque control switch is the economy mode torque control switch, determine that the external characteristic torque is the target vehicle speed request torque in the economy mode. It should be noted that the torque control switch for Economy mode is the same as the torque control switch for the subdivided Economy (ECO) mode. This switch specifically controls the activation and deactivation of the external torque adjustment function when the vehicle is in Economy driving mode. When this switch is on, the external torque adjustment function is only effective in Economy mode. The maximum speed requested torque in Economy mode refers to the requested torque set for the maximum speed when the vehicle is in Economy driving mode. Economy driving mode prioritizes the vehicle's fuel economy, and its requested torque setting will minimize energy consumption and maximize range while ensuring basic power needs and torque stability.

[0087] It should be understood that if the preset torque control switch is set to the economy mode torque control switch, it means that the current external characteristic torque adjustment is being performed in economy driving mode, and the adjusted external characteristic torque meets the power output requirements of economy mode. In this case, the calculated external characteristic torque is determined as the requested torque corresponding to the maximum vehicle speed in economy mode. When the vehicle subsequently travels to this maximum speed in economy mode, the vehicle controller will send a command to the motor controller based on this torque to ensure that the motor outputs stable torque in economy mode, satisfying both driving comfort requirements and energy efficiency.

[0088] Step S72: When the preset torque control switch is the motion mode torque control switch, determine that the external characteristic torque is the target vehicle speed request torque in motion mode.

[0089] It should be noted that among the subcategories of preset torque control switches, the Sport mode torque control switch is the torque control switch for Sport mode. This switch specifically controls the activation and deactivation of the external torque adjustment function when the vehicle is in Sport driving mode. When this switch is on, the external torque adjustment function is only effective in Sport mode. The maximum speed requested torque in Sport mode refers to the requested torque set for the maximum speed when the vehicle is in Sport driving mode. Sport mode emphasizes the vehicle's power responsiveness and acceleration performance, and its requested torque setting will, while ensuring torque stability, try to meet the demand for stronger power output to enhance the driving experience.

[0090] It should be understood that first confirming the preset torque control switch is the Sport mode torque control switch tic_tqrpmS_opmen indicates that the current external characteristic torque adjustment is being carried out in Sport driving mode, and the adjusted external characteristic torque is adapted to the power requirements of Sport mode. At this time, the calculated external characteristic torque is determined as the requested torque corresponding to the maximum vehicle speed in Sport mode. Subsequently, when the vehicle travels to this maximum speed in Sport mode, the vehicle controller will send a command to the motor controller based on this torque, so that the motor outputs stable and sufficient torque in Sport mode, which avoids driving discomfort and meets the driver's needs for sport performance.

[0091] Different driving modes are processed in a detailed manner. In Eco mode, the external characteristic torque is determined as the torque required for the maximum vehicle speed in this mode, balancing comfort and energy economy. In Sport mode, the torque is determined as the torque required for the maximum vehicle speed in this mode, balancing comfort and power performance, which can achieve precise torque control under different driving needs.

[0092] This embodiment provides a method for controlling the external characteristics of a new energy vehicle. When the torque fluctuation meets the requirements, the method obtains the reduced wheel-side torque, calculates the external characteristic torque based on the wheel-side torque, and updates the external characteristic torque table. This ensures that the torque control under the same operating conditions is based on the updated benchmark. The optimized external characteristic torque is determined as the target speed requested torque, so that the optimization effect can continue to act on the vehicle driving process under the target speed condition, so as to avoid the problem of excessive torque fluctuation at the target speed again and continuously ensure driving comfort.

[0093] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the method for controlling the external characteristics of new energy vehicles in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0094] This application also provides a new energy vehicle external characteristic control device, please refer to... Figure 4 The new energy vehicle external characteristic control device includes: Data acquisition module 10 is used to acquire current vehicle speed, current accelerator pedal opening and current wheel torque; The condition judgment module 20 is used to determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition when the preset torque control switch is in the open state. The torque monitoring module 30 is used to determine torque fluctuation information based on the current wheel-side torque when the preset torque detection condition is triggered; The torque control module 40 is used to reduce the external characteristic torque by a preset adjustment amount when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0095] In one embodiment, the torque control module 40 is further configured to query the external characteristic torque table based on the current motor speed to obtain the corresponding external characteristic torque; The external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold when the current vehicle speed and the current accelerator pedal opening meet the preset torque detection conditions.

[0096] In one embodiment, the torque control module 40 is further configured to obtain the current wheel-side torque after reduction when the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold. The target external characteristic torque is calculated based on the reduced current wheel-side torque, and the external characteristic torque is updated in the external characteristic torque table; The external characteristic torque is determined to be the torque requested for the target vehicle speed.

[0097] In one embodiment, the torque control module 40 is further configured to determine the external characteristic torque as the target vehicle speed requested torque, including the following steps: When the preset torque control switch is the economy mode torque control switch, the external characteristic torque is determined to be the target vehicle speed requested torque in economy mode; When the preset torque control switch is the motion mode torque control switch, the external characteristic torque is determined to be the target vehicle speed request torque in motion mode.

[0098] In one embodiment, the torque control module 40 is further configured to acquire instantaneous power, battery output power, and updated accelerator pedal opening change information; Determine whether the instantaneous power, the battery output power, and the updated accelerator pedal opening change information meet the preset driving safety conditions; If the preset driving safety conditions are not met, the operation of reducing the external characteristic torque will stop, and an external characteristic control error message will be displayed.

[0099] In one embodiment, the torque control module 40 is further configured to acquire updated current wheel-side torque, updated accelerator pedal opening, battery bus voltage, and battery bus current. Instantaneous power is calculated based on the updated current wheel-side torque and current motor speed; The battery output power is calculated based on the battery bus voltage and the battery bus current; The updated accelerator pedal opening change information is determined based on the updated accelerator pedal opening.

[0100] In one embodiment, the torque monitoring module 30 is further configured to compare the current vehicle speed with a preset vehicle speed threshold to obtain a vehicle speed judgment result; Accelerator pedal opening change information is determined based on the current accelerator pedal opening and the historical accelerator pedal opening. Based on the vehicle speed determination result and the accelerator pedal opening change information, it is determined whether to trigger the preset torque detection condition.

[0101] The new energy vehicle external characteristic control device provided in this application, employing the new energy vehicle external characteristic control method in the above embodiments, can solve the technical problem of how to suppress torque fluctuations and eliminate jerking and impact sensations while ensuring the overall vehicle power performance. Compared with the prior art, the beneficial effects of the new energy vehicle external characteristic control device provided in this application are the same as those of the new energy vehicle external characteristic control method provided in the above embodiments, and other technical features in the new energy vehicle external characteristic control device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0102] This application provides a new energy vehicle external characteristic control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the new energy vehicle external characteristic control method in the above embodiment 1.

[0103] The following is for reference. Figure 5The diagram illustrates a structural schematic suitable for implementing the external characteristic control device for new energy vehicles in the embodiments of this application. The external characteristic control device for new energy vehicles in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The illustrated new energy vehicle external characteristic control device is merely an example and should not impose any limitations on the function and scope of use of the embodiments of this application.

[0104] like Figure 5 As shown, the external characteristic control device for new energy vehicles may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in ROM (Read Only Memory) 1002 or a program loaded from storage device 1003 into RAM (Random Access Memory) 1004. RAM 1004 also stores various programs and data required for the operation of the external characteristic control device for new energy vehicles. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via bus 1005. Input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touch screens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, LCDs (Liquid Crystal Displays), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. The communication device 1009 allows the new energy vehicle external characteristic control device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows new energy vehicle external characteristic control devices with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented alternatively.

[0105] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0106] The new energy vehicle external characteristic control device provided in this application, employing the new energy vehicle external characteristic control method in the above embodiments, can solve the technical problem of how to suppress torque fluctuations and eliminate jerking and impact sensations while ensuring the overall vehicle power performance. Compared with the prior art, the beneficial effects of the new energy vehicle external characteristic control device provided in this application are the same as those of the new energy vehicle external characteristic control method provided in the above embodiments, and other technical features in this new energy vehicle external characteristic control device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0107] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0108] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0109] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, which are used to execute the new energy vehicle external characteristic control method in the above embodiments.

[0110] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, RAM (Random Access Memory), ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), or flash memory, optical fiber, CD-ROM (CD-Read Only Memory), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0111] The aforementioned computer-readable storage medium may be included in the external characteristic control device of the new energy vehicle; or it may exist independently and not be installed in the external characteristic control device of the new energy vehicle.

[0112] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by the new energy vehicle external characteristic control device, the new energy vehicle external characteristic control device: acquires the current vehicle speed, the current accelerator pedal opening, and the current wheel torque; when a preset torque control switch is in the on state, determines whether the current vehicle speed and the current accelerator pedal opening trigger a preset torque detection condition; when the preset torque detection condition is triggered, determines torque fluctuation information based on the current wheel torque; when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, adjusts the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, thereby completing the new energy vehicle external characteristic control, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

[0113] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including LAN (Local Area Network) or WAN (Wide Area Network)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0114] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0115] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0116] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described new energy vehicle external characteristic control method. This solves the technical problem of how to suppress torque fluctuations and eliminate jerking / impact sensations while ensuring the overall vehicle power performance. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the new energy vehicle external characteristic control method provided in the above embodiments, and will not be repeated here.

[0117] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method for controlling the external characteristics of a new energy vehicle.

[0118] The computer program product provided in this application can solve the technical problem of how to suppress torque fluctuations and eliminate jerking sensations while ensuring the overall vehicle power performance. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the new energy vehicle external characteristic control method provided in the above embodiments, and will not be repeated here.

[0119] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for controlling the external characteristics of a new energy vehicle, characterized in that, The method for controlling the external characteristics of new energy vehicles includes: Get the current vehicle speed, current accelerator pedal opening, and current wheel torque; When the preset torque control switch is in the on state, determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition; When the preset torque detection condition is triggered, torque fluctuation information is determined based on the current wheel-side torque; When the fluctuation range of the torque fluctuation information is greater than the first preset fluctuation threshold, the external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle. The second preset fluctuation threshold is less than the first preset fluctuation threshold.

2. The method as described in claim 1, characterized in that, The step of reducing the external characteristic torque by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold includes: Based on the current motor speed, the corresponding external characteristic torque is obtained by querying the external characteristic torque table. The external characteristic torque is reduced by a preset adjustment amount until the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold when the current vehicle speed and the current accelerator pedal opening meet the preset torque detection conditions.

3. The method as described in claim 1, characterized in that, After the step of adjusting the external characteristic torque by a preset adjustment amount when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, until the fluctuation range of the torque fluctuation information is less than a second preset threshold, the method further includes: If the fluctuation range of the torque fluctuation information is less than the second preset fluctuation threshold, the current wheel-side torque after the adjustment is obtained; The target external characteristic torque is calculated based on the reduced current wheel-side torque, and the external characteristic torque is updated in the external characteristic torque table; The external characteristic torque is determined to be the torque requested for the target vehicle speed.

4. The method as described in claim 3, characterized in that, The steps for determining the external characteristic torque as the target vehicle speed requested torque include: When the preset torque control switch is the economy mode torque control switch, the external characteristic torque is determined to be the target vehicle speed requested torque in economy mode; When the preset torque control switch is the motion mode torque control switch, the external characteristic torque is determined to be the target vehicle speed request torque in motion mode.

5. The method as described in claim 1, characterized in that, After the step of adjusting the external characteristic torque by a preset adjustment amount, the following steps are also included: Acquire instantaneous power, battery output power, and updated accelerator pedal opening information; Determine whether the instantaneous power, the battery output power, and the updated accelerator pedal opening change information meet the preset driving safety conditions; If the preset driving safety conditions are not met, the operation of reducing the external characteristic torque will stop, and an external characteristic control error message will be displayed.

6. The method as described in claim 5, characterized in that, The steps of acquiring instantaneous power, battery output power, and updated accelerator pedal opening change information include: Get updated current wheel torque, updated accelerator pedal opening, battery bus voltage, and battery bus current; Instantaneous power is calculated based on the updated current wheel-side torque and current motor speed; The battery output power is calculated based on the battery bus voltage and the battery bus current; The updated accelerator pedal opening change information is determined based on the updated accelerator pedal opening.

7. The method as described in claim 1, characterized in that, The step of determining whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition includes: The current vehicle speed is compared with a preset vehicle speed threshold to obtain the vehicle speed determination result; Accelerator pedal opening change information is determined based on the current accelerator pedal opening and the historical accelerator pedal opening. Based on the vehicle speed determination result and the accelerator pedal opening change information, it is determined whether to trigger the preset torque detection condition.

8. A new energy vehicle external characteristic control device, characterized in that, The device includes: The data acquisition module is used to acquire the current vehicle speed, current accelerator pedal opening, and current wheel torque; The condition judgment module is used to determine whether the current vehicle speed and the current accelerator pedal opening trigger the preset torque detection condition when the preset torque control switch is in the on state. The torque monitoring module is used to determine torque fluctuation information based on the current wheel-side torque when the preset torque detection condition is triggered; The torque control module is used to reduce the external characteristic torque by a preset adjustment amount when the fluctuation range of the torque fluctuation information is greater than a first preset fluctuation threshold, until the fluctuation range of the torque fluctuation information is less than a second preset fluctuation threshold, so as to complete the external characteristic control of the new energy vehicle, wherein the second preset fluctuation threshold is less than the first preset fluctuation threshold.

9. A device for controlling the external characteristics of a new energy vehicle, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the new energy vehicle external characteristic control method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the new energy vehicle external characteristic control method as described in any one of claims 1 to 7.

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