Vehicle sliding resistance decomposition method and device, storage medium and program product

Abstract

The invention relates to a vehicle sliding resistance decomposition method and device, a storage medium and a program product, and relates to the technical field of vehicles. The technical problem of how to accurately decompose the sliding resistance in the prior art is at least solved. The method comprises the following steps: acquiring sliding resistance and rolling resistance of a vehicle; wherein the sliding resistance is the sum of the rolling resistance, the air resistance and the internal resistance of the whole vehicle, and the internal resistance of the whole vehicle is the resistance generated by a transmission system in the running process of the vehicle. A torque of a driveline in a vehicle is obtained. And determining the internal resistance of the whole vehicle based on the torque of the transmission system. And determining the air resistance of the vehicle based on the sliding resistance and the internal resistance of the whole vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a method, device, storage medium and program product for decomposing vehicle coasting resistance. Background Art

[0002] With the vigorous development of vehicle technology, the research on the whole vehicle has become increasingly important, especially the research on the decomposition of coasting resistance. At present, the traditional method for decomposing coasting resistance mainly conducts tests on a roller dynamometer or a four-motor test bench. After accelerating the vehicle to a certain speed, it is allowed to coast freely until it stops, and data such as speed and time during the coasting process are recorded. Then, by disassembling and assembling components such as the drive shaft and calipers, and repeating the tests in different states, the coasting resistance is decomposed into rolling resistance, air resistance, and internal resistance of the vehicle.

[0003] However, in the above technical solutions, due to the interference of environmental factors and human factors in the traditional method for decomposing vehicle coasting resistance, the accuracy of the coasting resistance decomposition will be affected. Therefore, how to accurately decompose the coasting resistance has become an urgent technical problem to be solved. Summary of the Invention

[0004] The present application provides a method, device, storage medium and program product for decomposing vehicle coasting resistance, so as to at least solve the technical problem of how to accurately decompose the coasting resistance in the related art. The technical solutions of the present application are as follows:

[0005] According to the first aspect of the present application, there is provided a method for decomposing vehicle coasting resistance, including: a device for decomposing vehicle coasting resistance (hereinafter referred to as the "decomposition device") obtains the coasting resistance of the vehicle and the rolling resistance of the vehicle. The coasting resistance is the sum of the rolling resistance, air resistance, and internal resistance of the vehicle, and the internal resistance of the vehicle is the resistance generated by the transmission system during the driving process. Obtain the torque of the transmission system in the vehicle. Based on the torque of the transmission system, determine the internal resistance of the vehicle. Based on the coasting resistance and the internal resistance of the vehicle, determine the air resistance of the vehicle.

[0006] In a possible implementation manner, the internal resistance of the vehicle includes: motor internal resistance, reducer internal resistance, bearing internal resistance, and caliper internal resistance.

[0007] In a possible implementation manner, the torque of the transmission system includes: motor torque, drive shaft torque, and wheel torque. The method of "based on the torque of the transmission system, determine the internal resistance of the vehicle" includes: based on the motor torque, determine the motor internal resistance. Based on the drive shaft torque and the motor torque, determine the reducer internal resistance. Based on the wheel torque and the drive shaft torque, determine the bearing internal resistance and the caliper internal resistance.

[0008] In a possible implementation, the states of the caliper include a retracted state and a non-retracted state. The method of "determining the bearing internal resistance and the caliper internal resistance based on the wheel torque and the drive shaft torque" includes: determining the bearing caliper internal resistance based on the wheel torque and the drive shaft torque when the caliper is in the non-retracted state, where the bearing caliper internal resistance is the sum of the bearing internal resistance and the caliper internal resistance; determining the bearing internal resistance based on the wheel torque and the drive shaft torque when the caliper is in the retracted state; and determining the caliper internal resistance based on the bearing caliper internal resistance and the bearing internal resistance.

[0009] In a possible implementation, each torque difference among the motor torque, the drive shaft torque, and the wheel torque is less than a preset torque threshold.

[0010] In a possible implementation, the method of "acquiring the coasting resistance and the rolling resistance of the vehicle" includes: acquiring a plurality of candidate coasting resistances and a plurality of candidate rolling resistances, where the plurality of candidate coasting resistances and the plurality of candidate rolling resistances are all resistance data of the powertrain at different temperatures; determining the coasting resistance from the plurality of candidate coasting resistances and determining the rolling resistance from the plurality of candidate rolling resistances based on the powertrain temperatures corresponding to the plurality of candidate coasting resistances and the powertrain temperatures corresponding to the plurality of candidate rolling resistances, and the difference between the powertrain temperature corresponding to the coasting resistance and the powertrain temperature corresponding to the rolling resistance is less than a preset temperature difference threshold.

[0011] According to the second aspect provided by the present application, a device for decomposing the coasting resistance of a vehicle is provided. The device includes an acquisition module and a processing module. The acquisition module is configured to acquire the coasting resistance and the rolling resistance of the vehicle, where the coasting resistance is the sum of the rolling resistance, the air resistance, and the internal resistance of the vehicle body, and the internal resistance of the vehicle body is the resistance generated by the powertrain during the driving of the vehicle. The acquisition module is configured to acquire the torque of the powertrain in the vehicle. The processing module is configured to determine the internal resistance of the vehicle body based on the torque of the powertrain. The processing module is further configured to determine the air resistance of the vehicle based on the coasting resistance and the internal resistance of the vehicle body.

[0012] In a possible implementation, the internal resistance of the vehicle body includes: the internal resistance of the motor, the internal resistance of the reducer, the internal resistance of the bearing, and the internal resistance of the caliper.

[0013] In a possible implementation, the torque of the powertrain includes: the motor torque, the drive shaft torque, and the wheel torque. The processing module is configured to determine the internal resistance of the motor based on the motor torque. The processing module is further configured to determine the internal resistance of the reducer based on the drive shaft torque and the motor torque. The processing module is further configured to determine the internal resistance of the bearing and the internal resistance of the caliper based on the wheel torque and the drive shaft torque.

[0014] In a possible implementation, the states of the caliper include a retracted state and a non-retracted state. The processing module is configured to determine the internal resistance of the bearing caliper based on the wheel torque and the drive shaft torque when the caliper is in the non-retracted state. The internal resistance of the bearing caliper is the sum of the internal resistance of the bearing and the internal resistance of the caliper. The processing module is further configured to determine the internal resistance of the bearing based on the wheel torque and the drive shaft torque when the caliper is in the retracted state. The processing module is further configured to determine the internal resistance of the caliper based on the internal resistance of the bearing caliper and the internal resistance of the bearing.

[0015] In a possible implementation, each torque difference among the motor torque, the drive shaft torque, and the wheel torque is less than a preset torque threshold.

[0016] In a possible implementation, the acquisition module is configured to acquire a plurality of candidate sliding resistances and a plurality of candidate rolling resistances. The plurality of candidate sliding resistances and the plurality of candidate rolling resistances are both resistance data of the transmission system at different temperatures. The processing module is configured to determine the sliding resistance from the plurality of candidate sliding resistances and determine the rolling resistance from the plurality of candidate rolling resistances based on the transmission system temperatures corresponding to the plurality of candidate sliding resistances and the transmission system temperatures corresponding to the plurality of candidate rolling resistances. The difference between the transmission system temperature corresponding to the sliding resistance and the transmission system temperature corresponding to the rolling resistance is less than a preset temperature difference threshold.

[0017] According to a third aspect provided by the present application, another vehicle sliding resistance decomposition device is provided, including: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to execute the instructions to implement the method according to the first aspect and any one of its possible implementations.

[0018] According to a fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by the processor of the vehicle sliding resistance decomposition device, the vehicle sliding resistance decomposition device can execute the method according to the first aspect and any one of its possible implementations.

[0019] According to a fifth aspect provided by the present application, a computer program product is provided. The computer program product includes computer instructions. When the computer instructions run on the vehicle sliding resistance decomposition device, the vehicle sliding resistance decomposition device implements the method according to the first aspect and any one of its possible implementations.

[0020] Advantages of the present invention:

[0021] (1) By analyzing the vehicle coasting resistance and combining it with the rolling resistance, all resistance components including the rolling resistance, air resistance, and the internal resistance of the entire vehicle generated by the powertrain can be determined. Then, based on the torque changes of the powertrain, the internal resistance of the entire vehicle is accurately calculated, and then the rolling resistance and the internal resistance of the entire vehicle are deducted from the coasting resistance to obtain the air resistance. This method can accurately identify the influence of each resistance on the coasting resistance and precisely decompose the coasting resistance.

[0022] (2) By introducing the composition of the internal resistance of the entire vehicle, including the internal resistance of the motor, reducer, bearing, and caliper, the influence of these key components on the performance of the entire vehicle is described, providing support for the subsequent detailed decomposition of the internal resistance of the entire vehicle.

[0023] (3) By analyzing the motor torque, drive shaft torque, and wheel torque, the internal resistance of the motor, reducer, bearing, and caliper can be determined in sequence, and finally the internal resistance of the entire vehicle is obtained by summarization. This method accurately understands the specific influence of each component on the internal resistance of the entire vehicle and obtains the exact internal resistance values of each part.

[0024] (4) By analyzing the changes in the wheel torque and drive shaft torque, the bearing caliper internal resistance is first determined when the caliper is not fully retracted, and then the bearing internal resistance is separately determined after the caliper is fully retracted, and then the caliper internal resistance is calculated. This method can accurately identify and separate the resistances from different sources inside the vehicle, understand the influence of each component on the overall energy loss, and then decompose the internal resistance of the entire vehicle in more detail.

[0025] (5) By reducing the differences between the motor torque, drive shaft torque, and wheel torque to a preset safety performance threshold, the energy loss can be reduced, making the torque data of each part of the powertrain more accurate and improving the accuracy when determining the internal resistance of the entire vehicle based on the torque of the powertrain subsequently.

[0026] (6) First, multiple groups of coasting resistance and rolling resistance data measured under different temperature conditions are collected. Then, according to the temperature of the powertrain corresponding to each group of data, a group of coasting resistance and rolling resistance with a temperature difference less than the preset threshold can be selected to reduce the influence of temperature changes on the measurement results and ensure the consistency and reliability of the data. This method improves the accuracy of the measurement of the coasting resistance and rolling resistance by controlling the temperature variable and can improve the accuracy of the subsequent resistance decomposition.

[0027] It should be noted that for the technical effects brought by any implementation manner in the second aspect to the fifth aspect, reference can be made to the technical effects brought by the corresponding implementation manner in the first aspect, which will not be elaborated here.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit this application. Brief Description of the Drawings

[0029] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application, and do not constitute an improper limitation to the present application.

[0030] Figure 1 is a schematic flowchart of a method for decomposing vehicle coasting resistance shown according to an exemplary embodiment;

[0031] Figure 2 is a schematic diagram of an example of vehicle coasting resistance decomposition shown according to an exemplary embodiment;

[0032] Figure 3 is a schematic diagram of an example of the torque of a transmission system shown according to an exemplary embodiment;

[0033] Figure 4 is a schematic flowchart of another method for decomposing vehicle coasting resistance shown according to an exemplary embodiment;

[0034] Figure 5 is a schematic structural diagram of a device for decomposing vehicle coasting resistance shown according to an exemplary embodiment;

[0035] Figure 6 is a schematic structural diagram of another device for decomposing vehicle coasting resistance shown according to an exemplary embodiment. Detailed Description of the Embodiments

[0036] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] Before introducing in detail the method for decomposing vehicle coasting resistance in the embodiments of the present application, the implementation environment and application scenarios of the embodiments of the present application will be introduced first.

[0039] At present, through experiments, it has been found that the driving resistance (coasting resistance) of an automobile accounts for more than 50% of the energy consumption. Therefore, the overall vehicle drive efficiency can be improved by studying the decomposition of the coasting resistance. The coasting resistance consists of rolling resistance, air resistance, and internal resistance of the vehicle. Currently, the decomposition method of the coasting resistance mostly adopts the on-site coasting method, which can well reflect the actual resistance situation of the whole vehicle. However, when the coasting resistance needs to be improved, the above method cannot split the coasting resistance and determine the improvement direction.

[0040] In conventional technologies, resistance decomposition can be carried out on a roller dynamometer to obtain the resistance of the wheels. However, this method cannot accurately measure the air resistance, and there is no method to determine and decompose the internal resistance of the vehicle. In addition, the test environment temperature of the dynamometer, the temperature when the vehicle components are running, and the temperature of the vehicle during actual operation are inconsistent, which will also cause a certain error in the resistance measured by the dynamometer due to the temperature difference.

[0041] In some methods, the total tire resistance can be obtained on the roller, subtracted from the coasting resistance to obtain the vehicle aerodynamic resistance. After removing the tires, drive shafts, and calipers respectively, the vehicle runs on a four-motor bench from low to high speed, and the hub resistance at different speeds is recorded. The difference between the hub resistance measured on the roller and the front and rear wheel resistances measured on the roller is used to decompose the tire rolling resistance, the internal resistance of the electric drive system, the internal resistance of the bearings, and the caliper resistance. However, this method does not decompose the internal resistance of the motor and the reducer. The aerodynamic resistance and rolling resistance are decomposed by using the resistance read by the roller, and the accuracy of the roller is poor. In addition, by measuring the resistance by disassembling and assembling parts, the force state of the parts has changed after disassembly and assembly, affecting the test accuracy.

[0042] In some other methods, by removing the tires, motors, drive shafts, and braking systems, the vehicle decelerates from high to low speed on a four-motor bench, and the speed change is recorded. Then, the angular deceleration is obtained through the speed change, and together with the moment of inertia of the vehicle and the transmission system, the torque values at various speeds can be calculated, and the torque in each state can be obtained to achieve the purpose of decomposing the internal resistance. Compared with the above method, this method also removes the drive shaft and braking system. The difference is that this method also removes the motor, and the internal resistance of the motor and the reducer can be decomposed. In addition, the way of obtaining the torque in this method is different from the above method. It obtains the deceleration through the change of the angle, and calculates the torque together with the moment of inertia to achieve the purpose of decomposition. However, this method does not decompose the aerodynamic resistance and rolling resistance, and this method also measures the torque by disassembling and assembling parts. The force state of the parts has changed after disassembly and assembly, which is likely to affect the test accuracy. In addition, this patent obtains the force through the deceleration and the moment of inertia. It is not easy to obtain the moment of inertia, and the accuracy is affected.

[0043] In summary, in the process of using sliding resistance to decompose resistance, it is usually tested on a four-motor test bench. The torque is obtained by removing the drive shaft, caliper and other components in turn, and then subtracting them in turn to obtain the corresponding torque of each component. These methods have high equipment requirements. The wheels need to be removed, and the drive shaft, caliper and other components need to be disassembled and assembled. In addition, the test bench needs to be raised and lowered each time. These factors will affect the decomposition accuracy of the sliding resistance. In addition, after the components are removed, the stress state of the transmission system is inconsistent with the stress during installation, and the temperature of the transmission system is inconsistent with that during sliding, which will also affect the decomposition accuracy of the sliding resistance. Therefore, how to accurately decompose the sliding resistance is a technical problem that needs to be solved urgently.

[0044] In order to solve the above problems, an embodiment of the present application provides a method for decomposing the sliding resistance of a vehicle, which is applied to the scenario of decomposing the sliding resistance, including: by analyzing the sliding resistance of the vehicle and combining it with the rolling resistance, all resistance components including rolling resistance, air resistance and the internal resistance of the whole vehicle generated by the transmission system can be determined. Then, the internal resistance of the whole vehicle is accurately calculated based on the torque change of the transmission system, and then the rolling resistance and the internal resistance of the whole vehicle are deducted from the sliding resistance to obtain the air resistance. This method can accurately identify the impact of each resistance on the sliding resistance and accurately decompose the sliding resistance.

[0045] For ease of understanding, the decomposition method of the vehicle sliding resistance provided by the present application is specifically introduced below in conjunction with the accompanying drawings. Figure 1 is a flow chart of a method for decomposing a vehicle sliding resistance according to an exemplary embodiment. Figure 1 As shown, the method comprises the following steps:

[0046] S101. Obtain the sliding resistance and rolling resistance of the vehicle.

[0047] Among them, Figure 2 As shown in the figure, the sliding resistance is the sum of rolling resistance (i.e. rolling resistance), air resistance (i.e. wind resistance) and the internal resistance of the vehicle (i.e. sliding internal resistance). The internal resistance of the vehicle is the resistance generated by the transmission system of the vehicle during driving. The internal resistance of the vehicle includes: motor internal resistance, reducer internal resistance, bearing internal resistance, and caliper internal resistance.

[0048] It can be understood that by introducing the composition of the internal resistance of the whole vehicle, including the motor internal resistance, reducer internal resistance, bearing internal resistance and caliper internal resistance, the influence of these key components on the performance of the whole vehicle is described, which provides support for the subsequent detailed decomposition of the internal resistance of the whole vehicle.

[0049] As a possible design, the relationship between sliding resistance, rolling resistance, air resistance and vehicle internal resistance can be expressed by the following formula 1:

[0050] F total =Fw +F f +F i =F w +F f +(F i1 +F i2 +…+F n ) Formula 1.

[0051] Among them, F total is the total vehicle resistance measured by the coast-down method, F f is the rolling resistance, F w is the air resistance, F i is the internal resistance of the vehicle, F i1 , F i2 …, F n are the subdivided internal resistances after decomposing the internal resistance of the vehicle, such as the motor internal resistance, the reducer internal resistance, the bearing internal resistance, and the caliper internal resistance.

[0052] As a possible implementation, the decomposition device can collect the change of vehicle speed over time during the process of vehicle speed decreasing from high to low when the vehicle is coasting on a simulated road. Then, the decomposition device can analyze the vehicle deceleration characteristics based on the recorded data, and further calculate the coasting resistance at each speed.

[0053] As another possible implementation, the decomposition device can pre-store the gravity data of the vehicle. Then, the decomposition device can collect the test results of the tire rolling resistance bench to obtain the corresponding rolling resistance coefficient. Then, the decomposition device can determine the rolling resistance of the vehicle according to the rolling resistance coefficient and the gravity of the vehicle.

[0054] As a possible design, the acquisition of the rolling resistance can be expressed by the following Formula 2:

[0055] F f =f×G Formula 2.

[0056] Among them, F w is the rolling resistance, G is the gravity of the vehicle, which can be obtained by multiplying the test mass by the acceleration due to gravity.

[0057] S102. Obtain the torque of the drive system in the vehicle.

[0058] Among them, the torque of the drive system includes: motor torque, drive shaft torque, wheel torque, and the drive system includes: battery, motor, reducer, left wheel and right wheel.

[0059] As a possible implementation, the decomposition device can collect torque data among the battery, motor, reducer, left wheel, and right wheel in the drive system, and determine the motor torque based on the torque data between the motor and the reducer. Then, the decomposition device can determine the drive shaft torque based on the torque data between the left wheel and the shock absorber, and the torque data between the right wheel and the shock absorber. Then, the decomposition device can determine the wheel torque based on the torque data of the left wheel and the right wheel.

[0060] As Figure 3 shown, the drive system includes: a battery, a motor, a reducer, a left wheel, and a right wheel. Wireless torque sensors are respectively deployed between the motor and the reducer, on the left drive shaft between the left wheel and the reducer, on the right drive shaft between the right wheel and the reducer, on the right wheel, and on the left wheel to obtain the motor torque (i.e., F1), the left drive shaft torque (i.e., F21), the right drive shaft torque (i.e., F22), the left wheel torque (i.e., F31), and the right wheel torque (i.e., F32). Among them, the sum of the left drive shaft torque and the right drive shaft torque is the drive shaft torque, and the sum of the left wheel torque and the right wheel torque is the wheel torque.

[0061] As a possible design, the drive shaft torque and the wheel torque can be expressed by the following Formula 3 and Formula 4:

[0062] F2 = F 21 + F 22 Formula 3.

[0063] F3 = F 31 + F 32 Formula 4.

[0064] Among them, F 21 is the left drive shaft torque, F 22 is the right drive shaft torque, F2 is the drive shaft torque, F 31 is the left wheel torque, F 32 is the left wheel torque, and F3 is the wheel torque.

[0065] It should be noted that the torque differences among the motor torque, the drive shaft torque, and the wheel torque are all less than the preset torque threshold.

[0066] It can be understood that by reducing the differences among the motor torque, the drive shaft torque, and the wheel torque to a preset safety performance threshold, the energy loss can be reduced, the torque data of each part of the drive system can be made more accurate, and the accuracy of determining the internal resistance of the entire vehicle based on the torque of the drive system can be improved.

[0067] S103. Determine the internal resistance of the vehicle based on the torque of the drive system.

[0068] As a possible implementation, the decomposition device can determine the internal resistance of the motor based on the motor torque. Then, the decomposition device can determine the internal resistance of the reducer based on the drive shaft torque and the motor torque. Next, the decomposition device can determine the internal resistance of the bearing and the internal resistance of the caliper based on the wheel torque and the drive shaft torque.

[0069] Combining the above examples, the motor output torque can be the internal resistance of the motor, the difference between the drive shaft torque and the motor torque can be the internal resistance of the reducer, and the difference between the vehicle torque and the drive shaft torque can be the internal resistance of the bearing caliper.

[0070] As a possible design, the internal resistance of the motor and the internal resistance of the reducer can be obtained through the following Formula Five and Formula Six.

[0071] F i1 = F1 Formula Five.

[0072] F i2 = F2 + F1 Formula Six.

[0073] Among them, F1 is the motor torque, F i1 is the internal resistance of the motor, F i2 is the internal resistance of the reducer, and F2 is the drive shaft torque.

[0074] It should be noted that the decomposition device can, according to different states of the caliper, by the method of controlling variables, use the changes in the wheel torque and the drive shaft torque to respectively determine the internal resistance of the bearing and the internal resistance of the caliper.

[0075] In some embodiments, the decomposition device can determine the internal resistance of the bearing caliper based on the wheel torque and the drive shaft torque when the caliper is in the non-retracted state. The internal resistance of the bearing caliper is the sum of the internal resistance of the bearing and the internal resistance of the caliper. Then, the decomposition device can determine the internal resistance of the bearing based on the wheel torque and the drive shaft torque when the caliper is in the retracted state. Next, the decomposition device can determine the internal resistance of the caliper based on the internal resistance of the bearing caliper and the internal resistance of the bearing.

[0076] As a possible design, the internal resistance of the bearing caliper when the caliper is in the non-retracted state can be obtained through the following Formula Seven.

[0077] F m = F3 - F2 Formula Seven.

[0078] Among them, F m is the internal resistance of the bearing caliper, F3 is the wheel torque, and F2 is the drive shaft torque.

[0079] As another possible design, the internal resistance of the bearing and the internal resistance of the caliper when the caliper is in the retracted state can be obtained through the following Formula Eight and Formula Nine.

[0080] F i3 = F3 - F2 Formula Eight.

[0081] F i4 = F m - F i3 Formula Nine.

[0082] Wherein, F i3 is the internal resistance of the bearing, and F i4 is the internal resistance of the caliper.

[0083] It can be understood that by analyzing the changes in wheel torque and drive shaft torque, the internal resistance of the bearing and caliper is first determined when the caliper is not fully retracted, and then the internal resistance of the bearing is determined separately after the caliper is fully retracted, and then the internal resistance of the caliper is calculated. This method can accurately identify and separate the resistances from different sources inside the vehicle, understand the influence of each component on the overall energy loss, and further decompose the internal resistance of the whole vehicle in more detail.

[0084] It should be noted that the vehicle can coast without stepping on the brake pedal, so that the caliper is separated from the brake pedal. The decomposition device can monitor the friction between the brake pads and the brake disc. When the friction between the brake pads and the brake disc is 0, it indicates that the caliper is in the fully retracted state.

[0085] It can be understood that by analyzing the motor torque, drive shaft torque and wheel torque, the internal resistance of the motor, the internal resistance of the reducer, the internal resistance of the bearing and the internal resistance of the caliper can be determined in sequence, and finally the internal resistance of the whole vehicle can be obtained by summarization. This method accurately understands the specific influence of each component on the internal resistance of the whole vehicle and obtains the exact internal resistance values of each part.

[0086] S104. Determine the air resistance of the vehicle based on the coasting resistance and the internal resistance of the whole vehicle.

[0087] As a possible implementation, since the coasting resistance is the sum of the rolling resistance, air resistance and the internal resistance of the whole vehicle, the internal resistance of the whole vehicle can be determined by collecting the internal resistance of the motor, the internal resistance of the reducer, the internal resistance of the bearing and the internal resistance of the caliper as described above. Then, the decomposition device can determine the remaining part after subtracting the rolling resistance and the internal resistance of the whole vehicle from the coasting resistance as the air resistance of the vehicle.

[0088] As a possible design, the internal resistance of the whole vehicle and the air resistance can be obtained through the following Formula Ten and Formula Eleven.

[0089] F i = F i1 + F i2 + F i3 + F i4 Formula Ten.

[0090] F w = F total - F f - Fi Formula XI.

[0091] Among them, F i1 is the internal resistance of the motor, F i2 is the internal resistance of the reducer, F i3 is the internal resistance of the bearing, F i4 is the internal resistance of the caliper, F total is the total vehicle resistance measured by the coast-down method, F f is the rolling resistance, F w is the air resistance, F i is the internal resistance of the whole vehicle.

[0092] The technical solutions provided by the above embodiments at least bring the following beneficial effects: By analyzing the vehicle coast-down resistance and combining the rolling resistance, all resistance components including the rolling resistance, air resistance, and the internal resistance of the whole vehicle generated by the transmission system can be determined. Then, based on the torque change of the transmission system, the internal resistance of the whole vehicle is accurately calculated, and then the rolling resistance and the internal resistance of the whole vehicle are deducted from the coast-down resistance to obtain the air resistance. In this way, the influence of each resistance on the coast-down resistance can be accurately identified, and the coast-down resistance can be accurately decomposed.

[0093] It should be noted that, in order to ensure the accuracy of the obtained coast-down resistance and rolling resistance, it is necessary to ensure that the temperature difference between the two when obtaining them is not large. This method helps to avoid the influence caused by environmental temperature changes, thereby ensuring the reliability of the data and the accuracy of the decomposition result.

[0094] In some embodiments, the above obtaining the coast-down resistance of the vehicle and the rolling resistance of the vehicle (i.e., S101) may include the following steps: The decomposition device can obtain a plurality of candidate coast-down resistances and a plurality of candidate rolling resistances, and both the plurality of candidate coast-down resistances and the plurality of candidate rolling resistances are resistance data of the transmission system at different temperatures. Then, the decomposition device can determine the coast-down resistance from the plurality of candidate coast-down resistances and determine the rolling resistance from the plurality of candidate rolling resistances based on the transmission system temperature corresponding to the plurality of candidate coast-down resistances and the transmission system temperature corresponding to the plurality of candidate rolling resistances, and the difference between the transmission system temperature corresponding to the coast-down resistance and the transmission system temperature corresponding to the rolling resistance is less than a preset temperature difference threshold.

[0095] It can be understood that first, a plurality of groups of coast-down resistance and rolling resistance data measured under different temperature conditions are collected, and then a group of coast-down resistance and rolling resistance with a temperature difference less than a preset threshold can be selected according to the transmission system temperature corresponding to each group of data, so as to reduce the influence of temperature changes on the measurement results and ensure the consistency and reliability of the data. This method improves the accuracy of the measurement of the coast-down resistance and rolling resistance by controlling the temperature variable, and can improve the accuracy of the subsequent resistance decomposition.

[0096] In some embodiments, the decomposition device may obtain multiple vehicle speeds, each of which corresponds to a first sliding resistance. Then, the decomposition device may collect multiple sets of first sliding resistances at each vehicle speed, and average the first sliding resistances at each vehicle speed to obtain the sliding resistance corresponding to each vehicle speed. Then, the decomposition device may determine the relationship between vehicle speed and sliding resistance based on different vehicle speeds and their corresponding sliding resistances.

[0097] Furthermore, the decomposition device can also obtain multiple sets of preset resistances at a vehicle speed, and the preset resistance can be at least one of air resistance, vehicle internal resistance, motor internal resistance, reducer internal resistance, bearing internal resistance, and caliper internal resistance. Afterwards, the decomposition device can average the multiple sets of preset resistances at a vehicle speed to obtain the averaged preset resistance. Furthermore, the decomposition device can obtain the averaged preset resistances at different vehicle speeds, and determine the relationship between the vehicle speed and the preset resistance based on the averaged preset resistances at different vehicle speeds.

[0098] In this way, each vehicle speed corresponds to a variety of resistance data. The relationship between vehicle speed and sliding resistance can be accurately analyzed through multiple vehicle speeds and multiple resistance data, and then the laws of various resistances at different speeds can be analyzed.

[0099] The following is an introduction to the method for decomposing the vehicle sliding resistance provided by the embodiment of the present application with reference to specific examples. Figure 4 As shown, the following steps 1 to 10 are included:

[0100] Step 1. Start road gliding (i.e., obtain the vehicle's gliding resistance). Select a long, straight, and flat test road, and ensure that the wind speed on the test road is less than 5 meters per second (m / s). Weigh and counterweight the vehicle, check the tire pressure, ensure that the vehicle windows are closed, the vehicle appearance is intact, and the wind resistance is not affected. Preheat the vehicle, try not to use electric braking, and start driving onto a straight road after the temperature of the electric drive assembly reaches a constant, and glide in neutral. Then, record the ambient temperature during gliding and the temperature data of the electric drive assembly after the engine is heated. The vehicle's gliding speed is reversed from 130 kilometers per hour (km / h) to 20km / h, and each reverse is a group, with at least 4 groups in total. Due to site limitations, gliding can be performed in sections, but the step length must be at least 10km / h. Next, process the gliding data. The relationship between vehicle speed and gliding resistance can be referred to in Table 1 below:

[0101] Table 1 Relationship between vehicle speed and sliding resistance

[0102]

[0103]

[0104] It should be noted that due to the zero-torque control function of some electric vehicles, the coasting data is not processed by fitting it into a polynomial, otherwise it will be distorted during internal resistance decomposition.

[0105] Step 2: Rolling resistance coefficient test. The rolling resistance coefficient is tested through a tire rolling resistance bench. Check the tire pressure and test the vehicle according to the test specifications. It is required to test at intervals of 10 km / h from 20 km / h to 130 km / h, and the corresponding rolling resistance coefficient can be obtained. Then, determine the rolling resistance according to the rolling resistance coefficient and the above formula two.

[0106] Exemplarily, the relationship between vehicle speed and rolling resistance can be referred to Table 2 below:

[0107] Table 2 Relationship table between vehicle speed and rolling resistance

[0108] Vehicle speed (km / h) Rolling resistance coefficient (N / KN) 20 95.63 30 97.78 40 99.94 50 102.10 60 104.26 70 106.42 80 108.57 90 110.73 100 112.89 110 115.05 120 117.20 130 119.36

[0109] Step 3: Install motor torque, drive shaft torque, wheel torque, and temperature sensors. Drop the electric drive assembly from the vehicle, disassemble the motor, determine the installation position on the motor output shaft, machine, polish, and install torque strain gauges, temperature sensors, wireless power supply, and signal transmitters, and then reassemble them on the vehicle for signal debugging. Remove the drive shaft from the vehicle, determine the installation position on the drive shaft, polish, and install torque strain gauges, temperature sensors, wireless power supply, and signal transmitters, and then reassemble them on the vehicle for signal debugging. Remove the axle from the vehicle, remove the tire tread, replace the wheel hub, install a torque sensor on the wheel hub, inflate the tire to the standard tire pressure, perform dynamic balancing, and then reassemble and install it on the vehicle for signal debugging. Conduct debugging on the road to ensure that all signals are accurate and normal (i.e., obtain the torque of the transmission system in the vehicle).

[0110] Step 4: Preheat without braking on the roller dynamometer. Preheat at a vehicle speed of 80 - 120 km / h on the roller dynamometer until the electric drive temperature reaches the required temperature. It is required to be carried out in an environmental chamber, and the environmental temperature is the same as the temperature during coasting. During the preheating process, the driver does not step on the brake pedal, the energy recovery intensity is set to the maximum, and full electric braking is applied throughout the process.

[0111] Step 5: Conduct 3 - 8 groups of coasting on the roller dynamometer according to the road coasting conditions, and then determine whether the consistency of the 3 - 8 groups of coasting results meets the requirements. When the consistency does not meet the requirements, repeat Step 5; when the consistency meets the requirements, execute Step 6.

[0112] Specifically, the vehicle is quickly accelerated to 130 km / h on the roller dynamometer and then coasted to 20 km / h. The speed intervals during coasting on the roller dynamometer are the same as those in the road coasting test, which is 10 km / h. At each speed, 3 - 8 groups of coasting are performed, and the driver does not step on the brake pedal throughout the process. The temperature of the electric drive assembly during coasting remains consistent with that during the coasting test, with a temperature deviation of ±2°C. Record the motor torque, drive shaft torque, and wheel torque at each speed segment. Process the data, and process each group of data into the motor torque, drive shaft torque, and wheel torque corresponding to the speed. Check the consistency of the motor torque, drive shaft torque, and wheel torque at each speed segment during 3 - 8 groups of coasting. The torque difference does not exceed ±0.5 Nm. If it exceeds the range, this group of data will not be used. If the consistency varies greatly, repeat step 5.

[0113] Process the data. For each speed, average the 3 - 8 groups of data that meet the requirements at this speed. Take the motor torque as the motor internal resistance, subtract the motor torque from the drive shaft torque to obtain the reducer resistance, and subtract the drive shaft torque from the wheel torque to obtain the bearing caliper internal resistance (that is, based on the motor torque, determine the motor internal resistance; based on the drive shaft torque and the motor torque, determine the reducer internal resistance; based on the wheel torque and the drive shaft torque, determine the bearing internal resistance and the caliper internal resistance). The relationship between the speed and the motor internal resistance, reducer internal resistance, and bearing caliper internal resistance can be referred to Table 3 below:

[0114] Table 3 Relationship Table of Vehicle Speed with Motor Internal Resistance, Reducer Internal Resistance, and Bearing Caliper Internal Resistance

[0115] Vehicle speed (Km / h) Internal resistance of motor (N) Internal resistance of reducer (N) Internal resistance of bearing caliper (N) 20 23.29 0.77 37.65 30 25.08 1.38 34.60 40 26.80 1.75 32.89 50 28.85 1.99 31.11 60 29.46 2.30 30.52 70 28.47 2.49 30.31 80 0.80 2.48 30.88 90 0.55 2.99 30.26 100 0.55 2.88 30.48 110 0.55 3.25 30.52 120 0.55 3.71 30.70 130 0.55 4.32 30.93

[0116] Step 6: Drive at a high speed of 120 km / h without braking on the roller dynamometer for more than two hours. And throughout the process, the driver does not step on the brake pedal and coasts until the vehicle speed reaches zero.

[0117] Step 7: Park and let it stand still for 1 hour, and judge whether the caliper is fully retracted. If it is not fully retracted, continue to drive at a high speed of 120 km / h without braking on the roller dynamometer for more than two hours until the caliper is fully retracted. If the caliper is fully retracted, perform step 8.

[0118] Step 8: Preheat without braking on the roller dynamometer. Specifically, preheat at a vehicle speed of 80 - 120 km / h on the roller dynamometer until the electric drive temperature reaches the required temperature. It is required to be carried out in the environmental chamber, and the environmental temperature is the same as that during coasting. During the preheating process, the driver does not step on the brake pedal, the energy recovery intensity is set to the maximum, and it is all electric braking throughout the process.

[0119] Step 9: Perform 3 - 8 groups of coasting on the roller dynamometer. Then, judge whether the consistency of the results of 3 - 8 groups of coasting meets the requirements. When the consistency does not meet the requirements, repeat performing 3 - 8 groups of coasting on the roller dynamometer. When the consistency meets the requirements, perform data processing.

[0120] Specifically, on the roller dynamometer, the vehicle is quickly accelerated to 130 km / h and then coasted in intervals of at least 10 km / h down to 20 km / h. The vehicle speed is the same as that in the road coasting test. There are a total of 8 coasting runs, and the driver does not step on the brake pedal throughout the process. The temperature of the electric drive assembly during coasting is kept the same as that during the coasting test, with a temperature deviation of ±2°C. Record the drive shaft torque and wheel torque at each vehicle speed segment. Process the data and process each set of data into the drive shaft torque and wheel torque corresponding to the vehicle speed. Check the consistency of the drive shaft torque and wheel torque at each vehicle speed segment during the 3rd to 8th coasting runs. The torque difference does not exceed ±0.5 Nm (i.e., the torque differences between the motor torque, drive shaft torque, and wheel torque are all less than the preset torque threshold). If it exceeds the range, this set of data will not be used. If the consistency varies greatly, repeat step S7. If the consistency meets the requirements, average the 3rd to 8th sets of data that meet the requirements, subtract the drive shaft torque from the motor torque, and subtract the drive shaft torque from the wheel torque to obtain the bearing internal resistance and caliper internal resistance during coasting. The relationship between the vehicle speed and the bearing internal resistance and caliper internal resistance can be referred to in Table 4 below:

[0121] Table 4 Relationship Table of Vehicle Speed with Bearing Internal Resistance and Caliper Internal Resistance

[0122] Vehicle speed (Km / h) Internal resistance of caliper (N) Internal resistance of bearing (N) 20 17.59 20.06 30 14.50 20.10 40 12.52 20.38 50 10.13 20.99 60 9.25 21.27 70 8.40 21.91 80 7.90 22.99 90 7.17 23.09 100 6.89 23.59 110 6.04 24.48 120 5.60 25.11 130 5.10 25.83

[0123] Step 10: Process the data and end the process. Finally, obtain the relationships between the motor internal resistance, reducer internal resistance, bearing internal resistance, caliper internal resistance and the vehicle speed, subtract them from the coasting resistance to obtain the air resistance and rolling resistance, and by subtracting the rolling resistance at different vehicle speeds, the air resistance at different vehicle speeds can be obtained, thus achieving the complete decomposition of the coasting resistance.

[0124] It should be noted that in the prior art, the air resistance is calculated by the following formula XII. Since the air resistance coefficient needs to be measured in a wind tunnel and the wind tunnel resources are limited, generally, the air resistance coefficient is only measured in detail for newly developed vehicles with a brand-new shape. In addition, the corresponding relationship between the measurement results of the wind tunnel test and the actual coasting results of the whole vehicle through Formula 3 is not strong. Applying it to decompose the coasting resistance will cause the accuracy of the air resistance part to be transferred to other sub-items, and the credibility is not high.

[0125]

[0126] Among them, C D is the air resistance coefficient, A is the frontal area of the whole vehicle, F f is the air resistance, and v is the vehicle speed.

[0127] Exemplarily, the decomposition table of the coasting resistance can be referred to in Table 5 below:

[0128] Table 5 Decomposition Table of Coasting Resistance

[0129]

[0130] In summary, the present application can test the vehicle in the whole vehicle road coasting mode, collect the coasting resistance and rolling resistance. Then, a series of torque sensors are arranged in the drive system on the chassis dynamometer to obtain the internal resistance of each component of the whole vehicle at one time, so that the decomposition process of the internal resistance of the whole vehicle can be free from the influence of the up and down chassis dynamometer on the internal resistance measurement and the influence of disassembling and assembling components on the test of the internal resistance, thereby measuring the coasting resistance more accurately and achieving the purpose of accurately decomposing the internal resistance of the whole vehicle. Moreover, the temperature of the drive system can be monitored by a temperature sensor during coasting to remove the working conditions where the temperature is inconsistent with that of the whole vehicle road, ensuring that the decomposed internal resistance is consistent with the road coasting. Then, the air resistance can be determined according to the coasting resistance, rolling resistance and the internal resistance of the whole vehicle to achieve the accurate decomposition of the coasting resistance.

[0131] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. To implement the above functions, the device for decomposing the vehicle coasting resistance includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0132] The embodiment of the present application can divide the functional modules of the device for decomposing the vehicle coasting resistance according to the above method. For example, the device for decomposing the vehicle coasting resistance can include each functional module corresponding to each function division, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in the embodiment of the present application is illustrative, only a logical function division, and there may be other division methods in actual implementation.

[0133] Figure 5 is a schematic structural diagram of a device for decomposing vehicle coasting resistance shown according to an exemplary embodiment. Referring to Figure 5 , the device 500 for decomposing vehicle coasting resistance includes an acquisition module 501 and a processing module 502.

[0134] An acquisition module 501 is configured to acquire the coasting resistance and the rolling resistance of a vehicle. The coasting resistance is the sum of the rolling resistance, the air resistance, and the internal resistance of the vehicle. The internal resistance of the vehicle is the resistance generated by the transmission system during the driving process of the vehicle.

[0135] The acquisition module 501 is further configured to acquire the torque of the transmission system in the vehicle.

[0136] A processing module 502 is configured to determine the internal resistance of the vehicle based on the torque of the transmission system.

[0137] The processing module 502 is further configured to determine the air resistance of the vehicle based on the coasting resistance and the internal resistance of the vehicle.

[0138] Regarding the device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0139] Figure 6 is a schematic structural diagram of another device for decomposing the coasting resistance of a vehicle shown according to an exemplary embodiment. As Figure 6 shown, the device 600 for decomposing the coasting resistance of a vehicle includes, but is not limited to, a processor 601 and a memory 602.

[0140] Among them, the above-mentioned memory 602 is used to store the executable instructions of the above-mentioned processor 601. It can be understood that the above-mentioned processor 601 is configured to execute instructions to implement the method for decomposing the coasting resistance of a vehicle in the above embodiments.

[0141] It should be noted that those skilled in the art can understand that Figure 6 the structural diagram of the device for decomposing the coasting resistance of a vehicle shown in Figure 6 does not constitute a limitation on the device for decomposing the coasting resistance of a vehicle. The device for decomposing the coasting resistance of a vehicle may include more or fewer components than

[0142] shown, or combine certain components, or have different component arrangements. The processor 601 is the control center of the device for decomposing the coasting resistance of a vehicle, connecting various parts of the entire device for decomposing the coasting resistance of a vehicle through various interfaces and lines. By running or executing the software programs and / or modules stored in the memory 602, and calling the data stored in the memory 602, the processor 601 executes various functions of the device for decomposing the coasting resistance of a vehicle and processes data, thereby monitoring the entire device for decomposing the coasting resistance of a vehicle. The processor 601 may include one or more processing units. Optionally, the processor 601 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, the user interface, and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 601 either.

[0143] The memory 602 can be used to store software programs and various data. The memory 602 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). In addition, the memory 602 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0144] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as the memory 602 including instructions. The above instructions can be executed by the processor 601 of the vehicle coasting resistance decomposition device to implement the method in the above embodiment.

[0145] In actual implementation, Figure 5 the functions of the acquisition module 501 and the processing module 502 in Figure 6 can be implemented by the processor 601 in

[0146] calling the computer program stored in the memory 602. The specific execution process can refer to the description of the method part in the above embodiment, which will not be elaborated here.

[0147] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 601 of the vehicle coasting resistance decomposition device to complete the method in the above embodiment.

[0148] It should be noted that when the instructions in the above computer-readable storage medium or the one or more instructions in the computer program product are executed by the processor of the vehicle coasting resistance decomposition device, each process of the above method embodiment is implemented, and the same technical effect as the above method can be achieved. To avoid repetition, it will not be elaborated here.

[0149] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0150] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0151] The units described as separate components may or may not be physically separated. The components displayed as units may be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0152] In addition, each functional unit in various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0153] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods of the various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs and other various media that can store program codes.

[0154] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for decomposing the sliding resistance of a vehicle, characterized in that The method includes: Obtaining the coasting resistance of the vehicle and the rolling resistance of the vehicle, where the coasting resistance is the sum of the rolling resistance, air resistance, and internal resistance of the vehicle. The internal resistance of the vehicle is the resistance generated by the powertrain during the driving process of the vehicle; Obtaining the torque of the powertrain in the vehicle; Determining the internal resistance of the vehicle based on the torque of the powertrain; Determining the air resistance of the vehicle based on the coasting resistance and the internal resistance of the vehicle.

2. The method according to claim 1, wherein The internal resistance of the vehicle includes: motor internal resistance, reducer internal resistance, bearing internal resistance, and caliper internal resistance.

3. The method according to claim 2, characterized in that The torque of the powertrain includes: motor torque, drive shaft torque, and wheel torque. Determining the internal resistance of the vehicle based on the torque of the powertrain includes: Determining the motor internal resistance based on the motor torque; Determining the reducer internal resistance based on the drive shaft torque and the motor torque; Determining the bearing internal resistance and the caliper internal resistance based on the wheel torque and the drive shaft torque.

4. The method according to claim 3, wherein The state of the caliper includes a retracted state and a non-retracted state. Determining the bearing internal resistance and the caliper internal resistance based on the wheel torque and the drive shaft torque includes: Determining the bearing and caliper internal resistance based on the wheel torque and the drive shaft torque when the caliper is in the non-retracted state. The bearing and caliper internal resistance is the sum of the bearing internal resistance and the caliper internal resistance; Determining the bearing internal resistance based on the wheel torque and the drive shaft torque when the caliper is in the retracted state; Determining the caliper internal resistance based on the bearing and caliper internal resistance and the bearing internal resistance.

5. The method according to claim 3, characterized in that, The torque differences between the motor torque, the drive shaft torque, and the wheel torque are all less than a preset torque threshold.

6. The method according to any one of claims 1-4, characterized in that, Obtaining the coasting resistance of the vehicle and the rolling resistance of the vehicle includes: Obtaining a plurality of candidate coasting resistances and a plurality of candidate rolling resistances. The plurality of candidate coasting resistances and the plurality of candidate rolling resistances are all resistance data of the powertrain at different temperatures; Based on the powertrain temperature corresponding to the plurality of candidate coasting resistances and the powertrain temperature corresponding to the plurality of candidate rolling resistances, determining the coasting resistance from the plurality of candidate coasting resistances and determining the rolling resistance from the plurality of candidate rolling resistances. The difference between the powertrain temperature corresponding to the coasting resistance and the powertrain temperature corresponding to the rolling resistance is less than a preset temperature difference threshold.

7. A decomposition device for vehicle coasting resistance, characterized in that The device includes an acquisition module and a processing module; The acquisition module is used to obtain the coasting resistance of the vehicle and the rolling resistance of the vehicle. The coasting resistance is the sum of the rolling resistance, air resistance, and internal resistance of the vehicle. The internal resistance of the vehicle is the resistance generated by the powertrain during the driving process of the vehicle; The acquisition module is used to obtain the torque of the powertrain in the vehicle; The processing module is further used to determine the internal resistance of the vehicle based on the torque of the powertrain; The processing module is further used to determine the air resistance of the vehicle based on the coasting resistance and the internal resistance of the vehicle.

8. A device for decomposing the sliding resistance of a vehicle, characterized in that Includes: A processor; A memory for storing the processor-executable instructions; wherein the processor is configured to execute the instructions to implement the method for decomposing vehicle coasting resistance according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, When the computer-executable instructions stored in the computer-readable storage medium are executed by the processor of the vehicle coasting resistance decomposition device, the vehicle coasting resistance decomposition device can execute the method according to any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes computer program instructions which, when executed, implement the method according to any one of claims 1 to 6.

Images