Differential test verification system and differential test verification method for drive assembly differential

Abstract

The invention provides a differential test verification system for a drive assembly differential mechanism, and the system comprises a drive assembly with a differential mechanism, a half shaft, a brake assembly, a wheel rotating device, and a rotating speed and torque sensor. Wherein the left side and the right side of the differential mechanism are respectively connected with one end of the half shaft, and the other end of the half shaft is connected with the brake assembly; each brake assembly is connected with a test wheel; the test wheel is rotatably arranged on the wheel rotating device, and the brake assembly provides friction force for the test wheel; and the rotating speed and torque sensor is arranged on the half shaft and is used for testing the rotating speed and the torque. The invention further provides a differential test verification method of the drive assembly differential mechanism. The differential test verification system can simulate an actual application scene, and is small in occupied area, few in parts and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle drive assemblies, and in particular to a differential test verification system and a differential test verification method for a drive assembly differential. Background Art

[0002] The differential is installed in the reducer assembly. Its main function is to enable the vehicle to move when there is a speed difference between the two wheels, and to increase the tire speed quickly when the friction coefficient is very low on slippery roads. In order to verify this phenomenon, manufacturers generally use wheel bench tests, drive assembly drive bench tests, etc. for simulation verification, which requires a large bench space and is expensive.

[0003] Therefore, it is necessary to provide an improved differential test verification system and differential test verification method for a drive assembly differential to overcome or reduce at least some of the shortcomings of the above-mentioned prior art. Summary of the invention

[0004] In a first aspect of the present invention, a differential test verification system for a drive assembly differential is provided, wherein the differential test verification system comprises: a drive assembly with a differential, a half shaft, a brake assembly, a wheel rotation device, and a speed torque sensor;

[0005] Among them, one end of a half-axle is connected to the left and right sides of the differential respectively, and the other end of the half-axle is connected to a brake assembly; each brake assembly is connected to a test wheel; the test wheel is rotatably set on the wheel rotating device, and the brake assembly provides friction for the test wheel; the speed torque sensor is set on the half-axle for testing the speed and torque.

[0006] Optionally, the differential test verification system is configured to make the hub center of the test wheel and the half-axle at the same level.

[0007] Optionally, the differential is arranged in a reducer cavity of the drive assembly; and / or

[0008] The wheel rotating device comprises: a bracket and a roller, wherein two rollers are spaced apart on the bracket along the front-rear direction, and the rollers can rotate in a vertical plane relative to the bracket, wherein the test wheel is clamped between the two rollers and is suspended.

[0009] Optionally, the differential test verification system further includes: a control device configured to control the brake assembly based on a set operating condition and speed and torque information obtained by a speed and torque sensor.

[0010] Optionally, the brake assembly includes: a brake disc arranged at the test wheel, and the control device is configured to control the opening of the brake disc based on the set working condition and the speed and torque information obtained by the speed torque sensor to achieve the torque requirement of the set working condition.

[0011] In a second aspect of the present invention, a differential test verification method for a drive assembly differential is provided, wherein the differential test verification method is performed using the aforementioned differential test verification system; the test wheels include a first test wheel and a second test wheel; the differential test verification method includes the following steps:

[0012] The first test wheel and the second test wheel are rotatably arranged on two wheel rotating devices respectively, and the brake assemblies corresponding to the first test wheel and the second test wheel are connected to the corresponding half-axles respectively;

[0013] Control the motor action of the drive assembly and perform differential speed tests.

[0014] Optionally, before the step of controlling the motor action of the drive assembly, the differential speed test verification method further comprises the following steps:

[0015] The differential test verification system is adjusted so that the hub centers of the first test wheel and the second test wheel are at the same level with the half shafts.

[0016] Optionally, after the step of controlling the motor movement of the drive assembly, the differential speed test verification method further comprises the following steps:

[0017] Use the speed torque sensor to obtain speed and torque information;

[0018] Based on the set working condition and the speed and torque information obtained by the speed torque sensor, one or both of the two brake assemblies are adjusted to achieve the torque requirement of the set working condition.

[0019] Optionally, the step of adjusting the brake assembly includes:

[0020] The brake assembly is adjusted by adjusting the voltage input to the brake assembly.

[0021] Optionally, the set working condition includes simulating road conditions, and the road conditions include slippery road conditions and non-slippery road conditions.

[0022] The differential test verification system of the drive assembly differential of the present invention is configured to include a drive assembly, a half-axle, a brake assembly, a wheel rotating device, and a speed torque sensor, wherein one end of a half-axle is connected to the left and right sides of the differential respectively, and the other end of the half-axle is connected to a brake assembly; each brake assembly is connected to a test wheel; the test wheel is rotatably arranged on the wheel rotating device, and the brake assembly provides friction for the test wheel; the speed torque sensor is arranged on the half-axle, so that the actual application scenarios of slippery road surfaces and non-slippery road surfaces can be simulated, and at the same time, the differential test verification system has a small footprint, few components, and low cost.

[0023] The differential test verification method of the drive assembly differential of the present invention is carried out using the aforementioned differential test verification system; by rotatably arranging the first test wheel and the second test wheel on two wheel rotating devices respectively, and connecting the brake assemblies corresponding to the first test wheel and the second test wheel to the corresponding half-axles respectively, and then controlling the motor action of the drive assembly, the differential test can be carried out, and the operation is simple.

[0024] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Features, advantages, and exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals refer to like elements, and in which:

[0026] Figure 1 It is a structural schematic diagram of a differential test verification system for a drive assembly differential according to an embodiment of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the differential test verification system.

[0028] Figure 3 It is a flow chart of a differential test verification method of a drive assembly differential according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following is a detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. The description of the exemplary embodiments is merely exemplary and is by no means a limitation of the present invention and its application or usage. Moreover, the sizes and proportions of the components in the figures are merely schematic and do not strictly correspond to the actual product. It should be noted that, in this document, directional terms such as "front", "rear", "left", "right", "up", and "down" are all references to Figure 1 The position in.

[0030] The present invention provides a differential test verification system 100 for a drive assembly differential 110. Figure 1 As shown, the differential test verification system 100 includes: a drive assembly 101 with a differential 110, a half-shaft 102, a brake assembly 103, a wheel rotating device 104, and a speed torque sensor 105; wherein, one end of a half-shaft 102 is connected to the left and right sides of the differential 110 respectively, and the other end of the half-shaft 102 is connected to a brake assembly 103; each brake assembly 103 is connected to a test wheel; the test wheel is rotatably set on the wheel rotating device 104, and the brake assembly 103 provides friction for the test wheel; the speed torque sensor 105 is set on the half-shaft 102 for testing the speed and torque.

[0031] The differential test verification system 100 of the drive assembly differential 110 of the embodiment of the present invention is configured to include a drive assembly 101, a half-shaft 102, a brake assembly 103, a wheel rotating device 104, and a speed torque sensor 105, wherein one end of a half-shaft 102 is connected to the left and right sides of the differential 110 respectively, and the other end of the half-shaft 102 is connected to a brake assembly 103; each brake assembly 103 is connected to a test wheel; the test wheel is rotatably set on the wheel rotating device 104, and the brake assembly 103 provides friction for the test wheel; the speed torque sensor 105 is set on the half-shaft 102, so that the actual application scenarios of slippery roads and non-slippery roads can be simulated. At the same time, the differential test verification system 100 has a small footprint, few components, low cost, and the assembly of each component is very convenient and flexible, so that the site required for the test is flexible, which is more conducive to practical application.

[0032] like Figure 1 As shown, the test wheels may include a first test wheel 301 and a second test wheel 302 , and each test wheel has a corresponding half shaft 102 , a brake assembly 103 , a wheel rotating device 104 , and a speed torque sensor 105 .

[0033] The drive assembly 101 is a three-in-one product, including a motor controller, a reducer, and a motor. The product is verified in the form of an assembly, mainly verifying the differential 110 in the reducer module.

[0034] like Figure 1 As shown, the drive assembly 101 has a housing 111 , and the housing 111 defines a reducer cavity 112 and a motor cavity 113 . The differential 110 is disposed in the reducer cavity of the drive assembly 101 , and the motor (not shown in the figure) is disposed in the motor cavity 113 .

[0035] One end of the half shaft 102 is connected to the differential 110 , and the other end is connected to the brake assembly 103 , and may also be referred to as an output half shaft of the differential 110 .

[0036] The brake assembly 103 is an important part of the automobile braking system, and may include a brake disc, etc., which converts the kinetic energy of the vehicle into heat energy through the interaction between the hydraulic system and the friction force, thereby achieving deceleration and parking of the vehicle. In the embodiment of the present invention, the brake assembly 103 is used to provide friction. The brake assembly 103 may include a brake disc disposed at the test wheel, so that the brake disc is used to provide friction or resistance.

[0037] Usually, a speed torque sensor 105 is installed at the middle position of each of the two half shafts 102. The speed torque sensor 105 is mainly used to test the speed and torque of the half shafts 102 at both ends, and feed back the obtained speed and torque information to the control device 200 for collection. The function of the control device 200 will be described in detail below.

[0038] The specific structure of the drive assembly 101, the specific structure of the half-shaft 102, the specific structure of the brake assembly 103, the specific structure of the brake disc, the specific structure of the speed torque sensor 105, and the specific connection method therebetween can adopt any structure in the prior art and will not be described in detail here.

[0039] Continue to refer Figure 1 In some embodiments, the wheel rotating device 104 may include a bracket 141 and a roller 142, wherein two rollers 142 are spaced apart in the front-to-back direction on the bracket 141, and the rollers 142 can rotate in a vertical plane relative to the bracket 141, wherein the test wheel is clamped between the two rollers 142 and is suspended. A bearing (not shown in the figure) may be provided between the roller 142 and the bracket 141, and the roller 142 is rotatably connected to the bracket 141 by the bearing. Moreover, the bearing is configured to have very little resistance during operation, so it can be ignored. The roller 142 may be a hollow cylinder. In addition, the wheel rotating device 104 may further include an adjustment mechanism for adjusting the height of the roller 142, the spacing between the two rollers 142, etc.; that is, the wheel rotating device 104 may be adjusted according to the specifications of the tire. It can be understood that when the test wheel is required to be stationary, the roller 142 is also stationary. The wheel rotating device 104 can prevent the test wheel from leaving the test position, ensure that the test wheel moves within a certain area, and thus ensure the consistency of the test results. The wheel rotating device 104 can also be called a wheel hub rotating device.

[0040] The differential test verification system 100 of the embodiment of the present invention is configured to make the hub center of the test wheel and the half shaft 102 at the same level. That is, the size of the drive assembly 101, the specification of the test wheel, the size of the wheel rotating device 104, etc. are comprehensively considered to determine the size of each component, especially the height. By making the hub center of the test wheel on the wheel rotating device 104 and the half shaft 102 at the same level, the differential test verification system 100 can be made consistent with the actual vehicle conditions, making the test closer to the actual application scenario.

[0041] like Figure 2 As shown, the differential test verification system 100 of the embodiment of the present invention further includes: a control device 200 , which is configured to control the brake assembly 103 based on the set working condition and the speed and torque information obtained by the speed torque sensor 105 .

[0042] The set working condition is a simulated working condition set corresponding to the actual driving condition of the vehicle, including simulated road conditions, and the road conditions may include slippery road conditions and non-slippery road conditions. Slippery road conditions and non-slippery road conditions are evaluated by whether the vehicle wheels slip. It can be understood that when the actual vehicle is driving, the two vehicle wheels of the vehicle may be on the same type of road surface, or on different types of road surfaces. Therefore, the set working condition includes not only the situation where the two test wheels are on the same type of road surface, but also the situation where the two test wheels are on different types of road surfaces. Among them, slippery road conditions are, for example, ice surfaces, roads with snow on the surface, muddy roads, etc.; non-slippery road conditions are, for example, asphalt roads, dirt roads, gravel roads, non-muddy roads, etc. In order to make the test complete and accurate, the set working condition should include all actual driving conditions of the vehicle related to the differential 110 as comprehensively as possible.

[0043] By configuring the control device 200 to control the brake assembly 103 based on the set operating conditions and the speed and torque information obtained by the speed torque sensor 105, the torque of the test wheel can be made to meet the torque requirement corresponding to the set operating conditions. In this way, the test verification of the differential 110 is closer to the actual application scenario.

[0044] In the case where the brake assembly 103 includes a brake disc disposed at the test wheel, the control device 200 is configured to control the opening of the brake disc based on the speed and torque information obtained by the speed torque sensor 105 to achieve the torque requirement of the set working condition.

[0045] The control device 200 may be, for example, an industrial computer. The control device 200 may adjust the opening of the brake disc according to the speed and torque to achieve the torque requirement of the set working condition. Figure 2The differential test verification system 100 may further include a battery 201 for outputting high voltage electricity, and a storage battery 202 for outputting low voltage electricity.

[0046] The embodiment of the present invention further provides a differential test verification method for a drive assembly differential 110, wherein the differential test verification method is performed using the aforementioned differential test verification system 100; the test wheels include a first test wheel 301 and a second test wheel 302; Figure 3 As shown, the differential test verification method may include the following steps:

[0047] S302: The first test wheel 301 and the second test wheel 302 are rotatably disposed on two wheel rotating devices 104, respectively, and the brake assemblies 103 corresponding to the first test wheel 301 and the second test wheel 302 are connected to the corresponding half-axles 102, respectively;

[0048] S304: Control the motor action of the drive assembly 101 to perform a differential speed test.

[0049] The differential test verification method of the drive assembly differential 110 of the embodiment of the present invention is performed using the aforementioned differential test verification system 100; by rotatably arranging the first test wheel 301 and the second test wheel 302 on two wheel rotating devices 104 respectively, and connecting the brake assemblies 103 corresponding to the first test wheel 301 and the second test wheel 302 to the corresponding half-axles 102 respectively, and then controlling the motor action of the drive assembly 101, the differential test can be performed, and the operation is simple.

[0050] In step S304 , the input torque of the motor of the driving assembly 101 can be set as required, for example, to 20% of the peak torque.

[0051] Before the step of controlling the motor action of the drive assembly 101, the differential test verification method may further include the step of adjusting the differential test verification system 100 so that the hub centers of the first test wheel 301 and the second test wheel 302 are at the same level as the half shaft 102. By making the hub centers of the test wheels on the wheel rotating device 104 and the half shaft 102 at the same level, the differential test verification system can be made consistent with the actual vehicle conditions, making the test closer to the actual application scenario.

[0052] After the step of controlling the motor action of the drive assembly 101, the differential speed test verification method may further include the following steps:

[0053] The speed and torque information is obtained by using the speed and torque sensor 105;

[0054] Based on the set working condition and the speed and torque information obtained by the speed torque sensor 105, one or both of the two brake assemblies 103 are adjusted to achieve the torque requirement of the set working condition.

[0055] By using the speed and torque sensor 105 to obtain speed and torque information, and then adjusting one or both of the two brake assemblies 103 based on the set working condition and the speed and torque information obtained by the speed and torque sensor 105, the torque of the test wheel can be made to meet the torque requirement corresponding to the set working condition, so that the test verification of the differential 110 is closer to the actual application scenario. That is, by controlling one or both of the two brake assemblies 103, the differential operates under the set working condition, thereby simulating the operation of the whole vehicle under various actual working conditions.

[0056] In the above steps, the step of adjusting the brake assembly 103 may include: adjusting the brake assembly 103 by adjusting the voltage input to the brake assembly 103. For example, the control device 200 controls the input of a voltage of 0 to 5V, corresponding to the opening of the brake pedal in the actual working condition, that is, corresponding to the opening of the brake disc, wherein 0V corresponds to not stepping on the brake pedal, and 5V corresponds to the brake pedal being stepped on. In other words, the control device 200 outputs 5V, which means that the brake pedal is 100% locked and the brake assembly 103 is locked.

[0057] Take the setting working condition that the first test wheel 301 is on the ice surface and the second test wheel 302 is on the asphalt road as an example. The actual working condition corresponding to the setting working condition is that the first vehicle wheel of the vehicle is on the ice surface and the second vehicle wheel is on the asphalt road. Since the friction between the second vehicle wheel on the asphalt road and the asphalt road is much greater than the friction between the first vehicle wheel on the ice surface and the ice surface, the second vehicle wheel on the asphalt road is in a stationary state, while the first vehicle wheel on the ice surface is in a no-load rapid rising state. Correspondingly, the second test wheel 302 needs to be in a stationary state, that is, the brake assembly 103 needs to be locked. In this way, the control device 200 inputs a 5V voltage to the brake assembly 103 corresponding to the second test wheel 302; and for the first test wheel 301, the control device 200 inputs a 0V voltage to the brake assembly 103 corresponding to the first test wheel 301, and does not brake, so that the first test wheel 301 can rotate freely when there is torque.

[0058] Let's take the setting condition that the first test wheel 301 is on a muddy road and the second test wheel 302 is on a non-muddy road as an example. The actual condition corresponding to the setting condition is that the first vehicle wheel of the vehicle is on a muddy road and the second vehicle wheel is on a non-muddy road, because the friction between the second vehicle wheel on the non-muddy road and the non-muddy road is greater than the friction between the first vehicle wheel on the muddy road and the muddy road. In this way, the second test wheel 302 can be in a stationary state, that is, the brake assembly 103 corresponding to the second test wheel 302 is locked, and the control device 200 inputs a 5V voltage to the brake assembly 103 of the second test wheel 302; and for the first test wheel 301, the control device 200 inputs a 2V voltage to the brake assembly 103 corresponding to the first test wheel 301, that is, the brake disc is used to provide a certain friction.

[0059] According to the life cycle of the differential 110, the slip times of the tires of the first test wheel 301 and the second test wheel 302 should be tested continuously for no less than 1000 times.

[0060] In the differential speed test verification method of the embodiment of the present invention, step S304 controls the motor action of the drive assembly 101, and the step of performing the differential speed test may further include the following steps:

[0061] The brake assembly 103 corresponding to one of the first test wheel and the second test wheel is controlled to be locked, and the motor of the drive assembly is controlled to operate with a first input torque to increase the speed of the other of the first test wheel and the second test wheel from 0 to a set speed. After that, the motor of the drive assembly is controlled to operate with a second input torque to wait for the speed of the other of the first test wheel and the second test wheel to drop to 0, and the differential test is performed in this cycle.

[0062] The first input torque can be set as required, for example, 20% of the peak torque. The set speed can be set as required, for example, the maximum speed of the wheel. The second input torque can be set as required, for example, 0 Nm. Usually, the first test wheel and the second test wheel are controlled to perform the above differential test respectively.

[0063] For example, the first test wheel 301 and the second test wheel 302 are rotatably arranged on two wheel rotating devices 104, respectively, and the brake assemblies 103 corresponding to the first test wheel 301 and the second test wheel 302 are connected to the corresponding half shafts 102, respectively. The differential test verification system 100 is adjusted so that the hub centers of the first test wheel 301 and the second test wheel 302 are at the same level as the half shafts 102. The brake assembly 103 corresponding to the first test wheel 301 is controlled to be locked, so that the input torque of the motor of the drive assembly 101 is 20% of the peak torque, and the speed of the second test wheel 302 is increased from 0 to the maximum value, and then the input torque of the motor of the drive assembly 101 is 0Nm, and the speed of the second test wheel 302 is waited to drop to 0, and multiple differential tests are performed in this way, for example, 500 times. Then, the brake assembly 103 corresponding to the second test wheel 302 is controlled to be locked, so that the input torque of the motor of the drive assembly 101 is 20% of the peak torque, and the rotation speed of the first test wheel 301 is increased from 0 to the maximum value. After that, the input torque of the motor of the drive assembly 101 is 0Nm, and the rotation speed of the first test wheel 301 is waited to drop to 0. This cycle is repeated for multiple differential tests, for example 500 times.

[0064] The above differential speed test steps can be applied to a working condition where one section is a normal road surface such as an asphalt road, and the other section is an icy road.

[0065] The differential test verification method of the drive assembly differential 110 of the embodiment of the present invention performs different differential tests according to different set working conditions, so that the test verification of the differential 110 is more comprehensive and closer to the actual application scenario.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an example", "some embodiments", or "preferred embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] The embodiments of the present invention are described in detail above. However, aspects of the present invention are not limited to the above embodiments. Various modifications and substitutions may be applied to the above embodiments without departing from the scope of the present invention.

Claims

1. A differential test verification system for a drive assembly differential, wherein: The differential test verification system includes: a drive assembly with a differential, a half shaft, a brake assembly, a wheel rotation device, and a speed torque sensor; Wherein, one end of the half-shaft is connected to the left and right sides of the differential respectively, and the other end of the half-shaft is connected to the brake assembly; each brake assembly is connected to a test wheel; the test wheel is rotatably arranged on the wheel rotating device, and the brake assembly provides friction for the test wheel; the speed torque sensor is arranged on the half-shaft for testing the speed and torque.

2. The differential speed test verification system according to claim 1, wherein: The differential speed test verification system is configured to make the hub center of the test wheel and the half-axle at the same level.

3. The differential speed test verification system according to claim 1 or 2, wherein: The differential is arranged in the reducer cavity of the drive assembly; and / or The wheel rotating device comprises: a bracket and a roller, wherein two rollers are spaced apart on the bracket along the front-rear direction, and the rollers can rotate in a vertical plane relative to the bracket, wherein the test wheel is clamped between the two rollers and is arranged suspended.

4. The differential speed test verification system according to claim 1 or 2, wherein: The differential test verification system further includes: a control device configured to control the brake assembly based on a set operating condition and speed and torque information obtained by the speed and torque sensor.

5. The differential speed test verification system according to claim 4, wherein: The brake assembly includes: a brake disc arranged at the test wheel, and the control device is configured to control the opening of the brake disc based on a set working condition and the speed and torque information obtained by the speed torque sensor to achieve the torque requirement of the set working condition.

6. A differential test verification method for a drive assembly differential, wherein: The differential test verification method is performed using a differential test verification system according to any one of claims 1 to 5; the test wheel comprises a first test wheel and a second test wheel; the differential test verification method comprises the following steps: The first test wheel and the second test wheel are rotatably arranged on the two wheel rotating devices respectively, and the brake assemblies corresponding to the first test wheel and the second test wheel are connected to the corresponding half-axles respectively; The motor action of the drive assembly is controlled to perform a differential speed test.

7. The differential speed test verification method according to claim 6, wherein: Before the step of controlling the motor action of the drive assembly, the differential speed test verification method further includes the following steps: The differential test verification system is adjusted so that the hub centers of the first test wheel and the second test wheel are at the same level as the half-axles.

8. The differential speed test verification method according to claim 6, wherein: After the step of controlling the motor action of the drive assembly, the differential speed test verification method further comprises the following steps: Using the speed and torque sensor to obtain speed and torque information; Based on a set working condition and the speed and torque information obtained by the speed and torque sensor, adjusting one or both of the two brake assemblies to achieve the torque requirement of the set working condition; The set working condition includes simulated road conditions, and the road conditions include slippery road conditions and non-slippery road conditions.

9. The differential speed test verification method according to claim 8, wherein: The steps of adjusting the brake assembly include: The brake assembly is adjusted by adjusting the voltage input to the brake assembly.

10. The differential speed test verification method according to claim 6, wherein: The step of controlling the motor movement of the drive assembly to perform a differential test comprises the following steps: The brake assembly corresponding to one of the first test wheel and the second test wheel is controlled to be locked, and the motor of the drive assembly is controlled to operate with a first input torque to increase the speed of the other of the first test wheel and the second test wheel from 0 to a set speed. After that, the motor of the drive assembly is controlled to operate with a second input torque to wait for the speed of the other of the first test wheel and the second test wheel to drop to 0, and the differential test is performed in this cycle.

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