Commercial vehicle dynamic property simulation method and device, terminal and storage medium

Abstract

The invention provides a commercial vehicle dynamic property simulation method and device, a terminal and a storage medium, and belongs to the technical field of pure electric light commercial vehicles. A vehicle dynamic property simulation calculation model is established, and a dynamic property simulation module in the vehicle dynamic property simulation calculation model is defined; setting parameters of each module in the vehicle dynamic property simulation calculation model; configuring a dynamic property-based simulation calculation task of the commercial vehicle; based on the simulation calculation task, the climbing performance, the maximum vehicle speed and the full-load acceleration performance are calculated; and displaying and storing a dynamic property simulation calculation result. According to the method, the parameter data of each power assembly of the real vehicle is used for simulation, the pertinence is high, the simulation task setting is clear, and the accuracy of the simulation result is better facilitated. Repeated correction can be realized, and the accuracy of the result is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of pure electric light commercial vehicles, and in particular relates to a commercial vehicle dynamics simulation method, device, terminal and storage medium. Background Art

[0002] In the process of commercial vehicle design and development, dynamics evaluation is one of the important indicators for commercial vehicle performance considerations. Dynamics is not only related to the vehicle's driving performance, but also directly affects the vehicle's fuel economy, emission performance, driving comfort and other aspects.

[0003] Traditional dynamic performance evaluation methods often rely on actual test runs or simple theoretical calculations. For example, actual test runs require the manufacture of prototype vehicles and testing under various operating conditions, which not only takes a long time and is costly, but also makes it difficult to cover all possible operating conditions.

[0004] The current simple theoretical calculations are often based on a series of assumptions and simplifications, which cannot accurately reflect the complex situation of the vehicle in actual operation, resulting in a large deviation between the calculation results and the actual situation. In addition, due to the lack of precision of the model, inaccurate parameter settings or insufficiently advanced simulation algorithms, the simulation accuracy is not high, which makes it difficult to meet the needs of commercial vehicle dynamics evaluation. Summary of the invention

[0005] The present invention provides a commercial vehicle dynamics simulation method, which solves the problem that the commercial vehicle dynamics simulation accuracy in the prior art is low and it is difficult to meet the needs of commercial vehicle dynamics evaluation.

[0006] Methods include: S101: establishing a vehicle dynamics simulation calculation model, and defining a dynamics simulation module in the vehicle dynamics simulation calculation model; S102: Setting parameters of each module in the vehicle dynamics simulation calculation model; S103: configure the simulation calculation task based on the dynamics of the commercial vehicle; S104: Calculating the gradeability, maximum vehicle speed, and full-load acceleration performance based on the simulation calculation task; S105: Display and save dynamic simulation calculation results.

[0007] It should be further explained that in step S101, the dynamic simulation module includes: defining the driving wheels of the commercial vehicle, and configuring the motor module, battery module, single-stage reducer module, differential module, cab module and brake module respectively.

[0008] It should be further explained that, in the method, a signal communication association relationship is also established between the motor module, the battery module, the single-stage reducer module, the differential module, the cab module and the brake module.

[0009] It should be further explained that the parameters in step S102 include: the curb weight, full load weight, frontal area, air resistance coefficient, tire static rolling radius, tire dynamic rolling radius, single-stage reducer transmission ratio and transmission efficiency of the commercial vehicle.

[0010] It should be further explained that the climbing performance calculation method in step S104 is to determine the climbing ability of the vehicle according to the relationship between the vehicle driving equation and the driving force and the driving resistance; The driving force in the climbing performance is calculated based on the following formula: F t = F f + F w + F i + F j ; In the formula, F f 、F w 、F i 、F j They are slope resistance, rolling resistance, air resistance and acceleration resistance; The maximum climbing grade is calculated as follows:

[0011] Where: T t is the maximum torque of the driving motor; i 0 is the main reducer transmission ratio; η is the transmission system efficiency; m is the vehicle full load mass; g is the acceleration of gravity; α is the slope angle; f is the rolling resistance coefficient; C D is the air resistance coefficient; A is the windward area; μ a For vehicle speed.

[0012] It should be further explained that the maximum vehicle speed in step S104 is calculated as follows:

[0013] Where: n max is the maximum speed of the motor; r is the tire radius; i 0 Main reducer speed ratio.

[0014] It should be further explained that the full-load acceleration performance in step S104 is calculated as follows:

[0015] Where δ is the rotational mass conversion factor, is the starting speed of acceleration, is the final acceleration speed.

[0016] The present application also provides a commercial vehicle dynamics simulation device, the device comprising: a model building unit, a parameter setting unit, a task configuration unit, a parameter calculation unit and a display processing unit; A model building unit, used to build a vehicle dynamics simulation calculation model and define a dynamics simulation module in the vehicle dynamics simulation calculation model; A parameter setting unit, used to set the parameters of each module in the vehicle dynamics simulation calculation model; Task configuration unit, used to configure the simulation calculation tasks based on the dynamics of commercial vehicles; A parameter calculation unit calculates the gradeability, maximum vehicle speed and full-load acceleration performance based on the simulation calculation task; The display processing unit is used to display and save the dynamic simulation calculation results.

[0017] According to another embodiment of the present application, a simulation terminal is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of a commercial vehicle dynamics simulation method when executing the program.

[0018] According to another embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the commercial vehicle dynamics simulation method are implemented.

[0019] It can be seen from the above technical solutions that the present invention has the following advantages: The commercial vehicle dynamics simulation method provided in this application establishes a vehicle dynamics simulation calculation model and defines corresponding simulation modules. It can predict and evaluate the dynamic performance in the early stage of commercial vehicle design and during the use of commercial vehicles, avoiding the tedious process of verifying the dynamic performance through actual test drives in traditional methods, and greatly improving the design efficiency.

[0020] The simulation method can test and adjust the vehicle multiple times in a simulated environment without the need to manufacture actual vehicles or conduct expensive field tests, thus significantly reducing development costs. By carefully setting the parameters of each module in the simulation model, the various working conditions of the vehicle in actual operation can be more realistically simulated, thereby obtaining more accurate power performance evaluation results and improving the overall performance of the vehicle.

[0021] The method of the present application can evaluate multiple aspects such as climbing performance, maximum speed, and full-load acceleration performance, and can fully reflect the power performance of commercial vehicles. Moreover, the simulation calculation results can be intuitively displayed in the form of graphics, tables, etc. The simulation results can be saved as a reference and basis for subsequent designs, and a vehicle performance database can also be established to provide data support for the continuous improvement of subsequent products. Through the simulation method, multiple design schemes can be easily compared and evaluated to select the best one. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 This is a flow chart of the commercial vehicle dynamics simulation method; Figure 2 This is a flow chart of an embodiment of a commercial vehicle dynamics simulation method; Figure 3 This is a schematic diagram of a commercial vehicle power simulation device; Figure 4 This is a schematic diagram of the simulation terminal. DETAILED DESCRIPTION

[0024] The following will describe in detail the steps of the commercial vehicle dynamics simulation method provided by the present application. For the purpose of explanation rather than limitation, specific details such as specific system structures and technologies are provided to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0025] It should be understood that when used in the present specification, the term "includes" indicates the presence of the described features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their collections. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0026] It should be understood that the "one or more" mentioned in this application refers to one, two or more than two, and the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. The "and / or" in this article is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0027] The phrases such as "one embodiment" or "some embodiments" described in the present application mean that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases such as "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments" etc. that appear in different places in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 The flowchart of a commercial vehicle dynamics simulation method in a specific embodiment is shown, and the method includes: S101: establishing a vehicle dynamics simulation calculation model, and defining a dynamics simulation module in the vehicle dynamics simulation calculation model.

[0030] In some embodiments, MATLAB / Simulink simulation software, ADVISOR simulation software, or CarSim simulation software may be used to build a vehicle dynamics simulation calculation model.

[0031] It should be noted that MATLAB / Simulink simulation software builds a vehicle dynamics simulation system by writing MATLAB code and building a Simulink model.

[0032] ADVISOR stands for Advanced Vehicle Simulator, an open source vehicle simulation tool based on MATLAB / Simulink that provides vehicle models and simulation environment.

[0033] CarSim can simulate the dynamic response of vehicles under various working conditions, including power, braking, handling stability, etc.

[0034] Specifically, a vehicle dynamics simulation calculation model can be established based on the vehicle mass, tire radius, drag coefficient of the commercial vehicle, and the engine performance curve, transmission ratio, transmission efficiency, etc. of the power system.

[0035] In the vehicle dynamics simulation calculation model, modules directly related to dynamics can be defined.

[0036] Optionally, the modules directly related to the dynamics may include an engine module, a transmission system module, a wheel module, a resistance module, etc.

[0037] In some embodiments, a vehicle dynamics simulation calculation model for commercial vehicle dynamics simulation is established, and the model may include various parameters of dynamics simulation.

[0038] Parameters include but are not limited to vehicle mass, tire radius, drag coefficient, engine performance curve, transmission ratio, and transmission efficiency.

[0039] It should be noted that vehicle mass can include the total vehicle mass, the mass distribution of each axle, etc. The vehicle mass parameter is based on the simulation of the vehicle's acceleration performance and climbing ability in the vehicle dynamics simulation. The tire radius is used to consider the rolling resistance and driving speed of the wheel. The drag coefficient describes the air resistance encountered by the vehicle when driving, which is related to the vehicle's appearance design.

[0040] The engine performance curve of this embodiment may include a power-speed curve and a torque-speed curve. The transmission ratio is based on the transmission ratio under different gears. The transmission efficiency may include the transmission efficiency of components such as the transmission, the transmission shaft, and the final reducer.

[0041] In this embodiment, in the model, the modules directly related to the dynamics may include the following specific modules: The model may involve engine modules, transmission system modules, wheel modules, resistance modules, etc.

[0042] The engine module calculates the engine's output power and torque based on the engine's performance curve, speed, throttle opening, etc. .

[0043] Among them, P engine is the engine output power, f power It is a function of power-speed-throttle opening, rpm is the engine speed, and throttle is the throttle opening.

[0044] The transmission system module converts the engine's output torque and speed into the driving force and speed of the wheels based on the transmission's speed ratio and transmission efficiency.

[0045] It can be calculated based on the following formula: T w =T e ×i g ×η t .

[0046] Among them, T w is the wheel driving force, T e is the engine output torque, i g is the current gear ratio, η t is the transmission efficiency.

[0047] The wheel module calculates the acceleration and speed of the vehicle based on the driving force and rotation speed of the wheel, as well as parameters such as vehicle mass and tire radius. Formula example: Ft = T w / r w .

[0048] Where Ft is the wheel traction, r w is the tire radius.

[0049] The resistance module calculates the various resistances encountered by the vehicle during driving, including rolling resistance, air resistance, slope resistance, etc. This embodiment can simulate the power output and driving performance of commercial vehicles under different working conditions through the collaborative work of modules, providing strong support for vehicle design, performance evaluation and optimization.

[0050] S102: Setting parameters of each module in the vehicle dynamics simulation calculation model.

[0051] The parameters in this embodiment may specifically include engine parameters, transmission system parameters, vehicle parameters, and road and environment parameters.

[0052] Specifically, the engine parameters are parameters obtained by considering the engine's power-speed curve, torque-speed curve, fuel consumption rate, etc.

[0053] The transmission system parameters are obtained based on the gear ratios of the transmission, the transmission efficiency, and the reduction ratio of the main reducer.

[0054] Vehicle parameters include the vehicle's total mass, center of mass position, drag coefficient, frontal area, etc.

[0055] Road surface and environmental parameters include the slope, friction coefficient, temperature, humidity, etc. during simulation. These parameters will affect the vehicle's driving resistance and dynamic performance.

[0056] In some specific embodiments, the power-speed curve can be obtained through experimental data or a data table provided by the manufacturer. In the simulation, the data involved in the power-speed curve is input as discrete points or fitted as a continuous function so as to calculate the output power according to the engine speed during the simulation process.

[0057] The calculation method of fuel consumption rate is: Fuel consumption = fuel consumption rate × engine output power × time.

[0058] The speed ratio of each gear ratio of the transmission determines the conversion relationship between the engine speed and torque of the transmission in different gears.

[0059] Alternatively, output speed = input speed / speed ratio.

[0060] The transmission efficiency is calculated as follows: output torque = input torque × transmission efficiency.

[0061] In this embodiment, for aerodynamic parameters, air resistance = 0.5 × Cd × A × ρ × V².

[0062] Where ρ is the air density and V is the vehicle speed.

[0063] Of course, the above parameters are used to calculate the vehicle's driving resistance, power output and performance during the simulation process, thereby achieving a comprehensive evaluation of the commercial vehicle's dynamics.

[0064] S103: configuring a simulation calculation task based on the dynamics of a commercial vehicle; In this embodiment, specific simulation tasks are set in the simulation software, such as continuous climbing test, maximum vehicle speed test, full-load acceleration performance test, etc.

[0065] This embodiment also constructs a simulation scenario, and constructs a corresponding simulation scenario according to task requirements, including road conditions, traffic conditions, driving modes, etc.

[0066] This embodiment also sets specific simulation parameters for each task, such as initial speed, target speed, simulation time, etc.

[0067] In some specific embodiments, the task definition is to clarify the purpose of the simulation and the specific test content.

[0068] For example, a continuous climbing dynamics test can be performed, which simulates and evaluates the vehicle's continuous climbing ability on roads with different slopes. Multiple continuous slope segments can be defined, with the start and end positions, slope size, length, etc. of each slope segment.

[0069] This embodiment also involves a maximum vehicle speed dynamics test, where the maximum speed that a vehicle can reach on a straight road can be simulated and tested.

[0070] This implementation also involves full-load acceleration performance power testing, which evaluates the time and distance required for a simulated vehicle to accelerate from a stationary or initial speed to a certain target speed at full throttle. This test reflects the acceleration responsiveness and power reserve of the vehicle.

[0071] When it comes to simulation scene construction, it can be based on task requirements and involves multiple aspects, including road conditions, traffic conditions, environmental factors, and driving modes.

[0072] Specifically, the road condition can be set as a highway, city road, mountain road, etc. It can also be based on the road surface material, such as asphalt, cement, soil, etc.

[0073] For the working conditions of the simulation test, the simulation settings can be carried out through simulation of wind speed and wind direction, and the influence of engine performance, tire grip, humidity, etc.

[0074] When conducting simulation tests, specific driving modes can be selected or defined, such as Economy Mode, Sport Mode, or Custom Mode, which affect the vehicle's power output and fuel economy.

[0075] In some specific embodiments, specific simulation parameters may be set for each simulation task to ensure the accuracy and repeatability of the test results.

[0076] For example, you can set the initial speed and target speed of the dynamic simulation test.

[0077] The target speed here can be set to a speed value close to the theoretical limit of the vehicle; for full-load acceleration performance testing, it is set to the speed expected to be achieved.

[0078] This embodiment also sets a simulation time, which can be set according to task requirements. For example, a continuous climbing test may require setting sufficient time to ensure that the vehicle can completely pass through all slope sections.

[0079] In combination with speed and time, you can also configure the engine's maximum power, maximum torque, vehicle mass, drag coefficient, frontal area, etc. These parameters directly affect the vehicle's dynamic performance.

[0080] For driving control methods, you can configure gear shifting logic, throttle opening control strategy, etc. The optimization of these strategies can significantly improve the vehicle's power.

[0081] For example, in the dynamic test of this embodiment, during the hill climbing test, the power Fr required by the vehicle can be calculated by the following formula: Fr=(mgsinθ+Cd Av 2 ) / 2+mv o .

[0082] Where θ is the slope angle, v is the vehicle speed, and v o is the acceleration, m is the vehicle mass, C d Drag coefficient, A is the windward area.

[0083] Through the above steps and formulas, the dynamic simulation tasks of commercial vehicles can be accurately configured and executed in the simulation software, providing strong support for vehicle design, optimization and performance evaluation.

[0084] S104: Calculate the gradeability, maximum vehicle speed, and full-load acceleration performance based on the simulation calculation task.

[0085] In some embodiments, the climbing performance calculation can simulate the process of a vehicle climbing a slope from a standstill on a set slope, record the highest position or maximum slope that the vehicle can reach, and evaluate its climbing ability.

[0086] For the calculation of the maximum vehicle speed, the vehicle can be simulated to accelerate to a stable state with maximum acceleration on a straight road, and the maximum vehicle speed can be recorded and calculated.

[0087] The full-load acceleration performance calculation can simulate the time required for a vehicle to accelerate from a standstill to a predetermined speed at maximum acceleration on a straight road, and evaluate its acceleration performance.

[0088] S105: Display and save dynamic simulation calculation results.

[0089] In some embodiments, after the dynamic simulation is completed, the results of various dynamic indicators, such as maximum climbing grade, maximum vehicle speed, acceleration time, etc., will be automatically calculated and displayed.

[0090] Optionally, the simulation results can be saved as files for subsequent analysis and report preparation. In-depth analysis of the simulation results can be performed to compare the impact of different parameters or configurations on power performance, providing a basis for vehicle design or improvement.

[0091] In one embodiment of the present invention, based on the commercial vehicle dynamics simulation method, the dynamics of the commercial vehicle can be simulated and calculated by establishing a vehicle dynamics simulation calculation model, inputting parameters of each assembly model, customizing the required calculation tasks, and calculating and viewing the calculation results. Figure 2 As shown, a possible example is given below to illustrate its specific implementation scheme in a non-limiting manner.

[0092] S201: Establish a vehicle dynamics simulation calculation model, and take a pure electric light commercial vehicle as an example to analyze the structure and function of the whole vehicle. The pure electric light commercial vehicle is rear-wheel drive, and the cab is responsible for controlling the accelerator pedal and the brake pedal.

[0093] According to the analysis of the structure and layout, the vehicle module, the motor module, the battery module, the single-stage reducer module as the main reducer, the differential module, the cab module, and the wheel and brake module are configured.

[0094] In some embodiments, after each subsystem model is selected, the physical connection of the model is established according to the configuration scheme and component connection relationship of the pure electric light commercial vehicle. There is a direct physical connection relationship between the components of the powertrain, and there is also a physical connection relationship between the wheels and the brakes, but there is no physical connection between the cab and the powertrain and brake systems. In the simulation process, it is recommended that information is transmitted between modules through signal connections.

[0095] In this embodiment, the speed signal involved in the cab of the vehicle dynamics simulation calculation model comes from the speed of the motor; similarly, the brake pressure required by the brake, the load signal required by the motor and the ambient temperature signal all come from the cab.

[0096] S202: Input parameters of each assembly model.

[0097] In some embodiments, the data of each model may be input in the following ways: manually inputting data; calling in data from an existing model; inputting and outputting data by copying and pasting.

[0098] According to the actual vehicle data of pure electric light commercial vehicles, the curb weight can be set to 2000-2400kg, the full load weight to 3100-3500kg, the frontal area to 2.5-3.2 m2, and the air resistance coefficient to 0.35-0.5. The static rolling radius of the tire is 350-400mm, and the dynamic rolling radius of the tire is 350-400mm. The transmission ratio of the single-stage reducer is 10-15, and the transmission efficiency is 0.9-0.99.

[0099] S203: Customize computing tasks.

[0100] In an exemplary embodiment, a corresponding folder is created according to the content to be calculated, and a corresponding calculation task is added to each folder. This embodiment can perform simulation calculations of power performance, including climbing performance, steady-state driving, and full-load acceleration performance. In combination with the calculation tasks, it can be defined to include: driving resistance, driver, road environment, etc.

[0101] S104: Execute dynamic parameter calculation based on the simulation calculation task.

[0102] In some embodiments, the climbing performance is calculated. The climbing ability of the car can be determined based on the car driving equation and the driving force-driving resistance balance diagram. The climbing ability of the car in this embodiment refers to the slope that the car can climb when the remaining force after overcoming the rolling resistance and air resistance on a good road surface is fully used (i.e., at a constant speed) to overcome the slope resistance.

[0103] Therefore, F t = F f + F w + F i + F j (1) Where: F t 、F f 、F w 、F i 、F j They are slope resistance, rolling resistance, air resistance and acceleration resistance. According to the car driving equation, if you want to drive at a constant speed, the acceleration resistance F j =0.

[0104] That is F t = F f + F w + F i , after deformation, we get F i =F t -(F f + F w ), according to the mechanical formula, it can be transformed into

[0105] Where: T t is the maximum torque of the driving motor; i 0 is the main reducer transmission ratio; η is the transmission system efficiency; m is the vehicle full load mass; g is the acceleration of gravity; α is the slope angle; f is the rolling resistance coefficient; C D is the air resistance coefficient; A is the windward area; μ a For vehicle speed.

[0106] Let sinα=t, then cosα= , put it into the equation and we get

[0107] Substitute the vehicle parameters and solve the quadratic equation to obtain the t value, which is the sinα value.

[0108] Using inverse trigonometric functions, we can get the maximum climbing grade α. According to the relevant parameters of this vehicle model, we can calculate that the maximum climbing grade is 35-40%.

[0109] In some embodiments, the maximum vehicle speed is calculated by using the maximum speed of the driving motor:

[0110] Where: n max is the maximum speed of the motor; r is the tire radius; i 0 Main reducer speed ratio.

[0111] According to the maximum speed of the drive motor of this model, it can be calculated that the maximum vehicle speed is 130-135km / h.

[0112] In some embodiments, the full load acceleration performance calculation is a test simulation of the vehicle's acceleration capability.

[0113] The acceleration of a vehicle can be evaluated by the acceleration it can generate when driving on a level and good road. Since acceleration is not easy to measure, the acceleration time can be used to indicate the acceleration of the vehicle. The acceleration time from a stationary start to a certain final speed can be used to evaluate the dynamics of the vehicle. The acceleration time from a certain initial speed to a certain final speed can also be used to evaluate the dynamics of the vehicle.

[0114] From formula 1, we can see that on a horizontal road, F i =0, that is, F t = F f + F w + F j

[0115] From kinematics, we know , deformed

[0116] =

[0117]

[0118] Where δ is the rotational mass conversion factor, is the starting speed of acceleration, is the final acceleration speed.

[0119] According to the relevant parameters of this model, it can be calculated that the acceleration time from 0 to 100 km / h when fully loaded is 11s-13s, and the acceleration time from 50 to 80 km / h is 5-7s.

[0120] S205: Compare the calculation results with the expected target. If the difference is too large or obviously abnormal, recheck the vehicle model, check the data of each assembly model, confirm the simulation task, recalculate, check the calculation results, and thus determine the power of the whole vehicle.

[0121] The commercial vehicle dynamics simulation method involved in this application is targeted at pure electric light commercial vehicles. According to the parameter data of each powertrain of the actual vehicle, the dynamics calculation task is customized, including the maximum climbing performance, the maximum vehicle speed, and the full-load acceleration performance, and the whole vehicle dynamics simulation calculation is performed. The obtained results are analyzed. If there are errors, the model or assembly data can be modified and the simulation calculation is performed again. It is highly targeted, practical, efficient and fast. Through the analysis of simulation calculation results, accurate simulation results can be obtained, which greatly shortens the project development cycle, reduces the cost of vehicle development and reduces the risk of project development.

[0122] The following is an embodiment of a commercial vehicle dynamics simulation device provided in an embodiment of the present disclosure. The device and the commercial vehicle dynamics simulation method of the above-mentioned embodiments belong to the same inventive concept. For details not described in detail in the embodiment of the commercial vehicle dynamics simulation device, reference can be made to the embodiment of the above-mentioned commercial vehicle dynamics simulation method.

[0123] like Figure 3 As shown, the device includes: a model building unit, a parameter setting unit, a task configuration unit, a parameter calculation unit and a display processing unit.

[0124] The model building unit is used to build a vehicle dynamics simulation calculation model and define a dynamics simulation module in the vehicle dynamics simulation calculation model.

[0125] The parameter setting unit is used to set the parameters of each module in the vehicle dynamics simulation calculation model.

[0126] The task configuration unit is used to configure the simulation calculation tasks based on the dynamics of commercial vehicles.

[0127] The parameter calculation unit calculates the climbing performance, maximum vehicle speed and full-load acceleration performance based on the simulation calculation task.

[0128] The display processing unit is used to display and save the dynamic simulation calculation results.

[0129] The present application also provides a simulation terminal, which is used to implement the steps of the commercial vehicle dynamics simulation method when executing the program.

[0130] The simulation terminal may be a mobile terminal (MT), a mobile station (MS), a mobile unit (MU), a mobile client, etc. For example, the simulation terminal may be a mobile phone, a smart screen device, a tablet computer, an augmented reality (AR) device, a virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), etc., and the embodiments of the present application do not limit this.

[0131] Figure 4 The emulation terminal 500 includes but is not limited to: a network module 502, an audio output unit 503, an input unit 504, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, a processor 501 and other components.

[0132] Processor 501 includes one or more processor implementations, such as one or more digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other equivalent integrated circuits or discrete logic circuits. Therefore, the term "processor," as used herein, may refer to any of the aforementioned structures or any other structure that is more suitable for implementing the technology described herein. In addition, in some aspects, the functions described in the present disclosure may be provided in software modules and hardware modules.

[0133] The simulation terminal provides wireless broadband Internet access for the simulation process through the network module 502.

[0134] The audio output unit 503 includes a speaker, a buzzer, a receiver, etc. The input unit 504 is used to receive audio or video signals. The input unit 504 may include a graphics processing unit (GPU) and a microphone, and the graphics processor processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The processed image frame can be displayed on a display unit. The display unit 506 is used to display information input by a user or information provided to a user. The memory 509 can be used to store software programs and various data.

[0135] The commercial vehicle dynamics simulation method and simulation terminal provided by the present invention are units and algorithm steps of each example described in combination with the embodiments disclosed herein, and can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0136] The storage medium provided in the present application stores a program product capable of implementing the commercial vehicle dynamics simulation method described above in this specification. In some possible implementations, various aspects of the present disclosure may also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present disclosure described in the above “Exemplary Method” section of this specification.

[0137] The storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0138] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A commercial vehicle dynamics simulation method, It is characterized in that Methods include: S101: establishing a vehicle dynamics simulation calculation model, and defining a dynamics simulation module in the vehicle dynamics simulation calculation model; S102: Setting parameters of each module in the vehicle dynamics simulation calculation model; S103: configuring a simulation calculation task based on the dynamics of a commercial vehicle; S104: Calculating the gradeability, maximum vehicle speed, and full-load acceleration performance based on the simulation calculation task; S105: Display and save dynamic simulation calculation results.

2. The commercial vehicle dynamics simulation method according to claim 1, It is characterized in that In step S101, the dynamic simulation module includes: defining the driving wheels of the commercial vehicle, and configuring a motor module, a battery module, a single-stage reducer module, a differential module, a cab module and a brake module respectively.

3. The commercial vehicle dynamics simulation method according to claim 2, It is characterized in that In the method, a signal communication association relationship is also established between the motor module, the battery module, the single-stage reducer module, the differential module, the cab module and the brake module.

4. The commercial vehicle dynamics simulation method according to claim 1, It is characterized in that The parameters in step S102 include: the curb weight, fully loaded weight, frontal area, air resistance coefficient, tire static rolling radius, tire dynamic rolling radius, single-stage reducer transmission ratio and transmission efficiency of the commercial vehicle.

5. The commercial vehicle dynamics simulation method according to claim 1, It is characterized in that The climbing performance calculation method in step S104 is to determine the climbing ability of the vehicle according to the relationship between the vehicle driving equation and the driving force and the driving resistance; The driving force in the climbing performance is calculated based on the following formula: F t = F f + F w + F i + F j ; In the formula, F f 、F w 、F i 、F j They are slope resistance, rolling resistance, air resistance and acceleration resistance; The maximum climbing grade is calculated as follows: Where: T t is the maximum torque of the driving motor; i 0 is the main reducer transmission ratio; η is the transmission system efficiency; m is the vehicle full load mass; g is the acceleration of gravity; α is the slope angle; f is the rolling resistance coefficient; C D is the air resistance coefficient; A is the windward area; μ a For vehicle speed.

6. The commercial vehicle dynamics simulation method according to claim 1, It is characterized in that The maximum vehicle speed in step S104 is calculated as follows: Where: n max is the maximum speed of the motor; r is the tire radius; i 0 Main reducer speed ratio.

7. The commercial vehicle dynamics simulation method according to claim 1, It is characterized in that The full-load acceleration performance in step S104 is calculated as follows: Where δ is the rotational mass conversion factor, is the starting speed of acceleration, is the final acceleration speed.

8. A commercial vehicle dynamics simulation device, It is characterized in that The device is used to implement the commercial vehicle dynamics simulation method as described in any one of claims 1 to 7; The device comprises: a model building unit, a parameter setting unit, a task configuration unit, a parameter calculation unit and a display processing unit; A model building unit, used to build a vehicle dynamics simulation calculation model and define a dynamics simulation module in the vehicle dynamics simulation calculation model; A parameter setting unit, used to set the parameters of each module in the vehicle dynamics simulation calculation model; Task configuration unit, used to configure the simulation calculation tasks based on the dynamics of commercial vehicles; A parameter calculation unit calculates the gradeability, maximum vehicle speed and full-load acceleration performance based on the simulation calculation task; The display processing unit is used to display and save the dynamic simulation calculation results.

9. An emulation terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the program, the steps of the commercial vehicle dynamics simulation method according to any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the commercial vehicle dynamics simulation method according to any one of claims 1 to 7 are implemented.

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