Method and system for conveniently measuring comprehensive backlash of vehicle transmission system

Abstract

The invention provides a method and system for conveniently measuring the comprehensive backlash of a vehicle transmission system, and the method comprises the steps: measuring a motor resolver angle # imgabs0 # switched to an N gear or a P gear and a motor resolver angle # imgabs1 # switched to a D gear for multiple times through a motor resolver sensor when a vehicle is located on a flat road surface and is in a static state, so as to obtain a single-time transmission system backlash value # imgabs2 #; according to the method, the change of the backlash of the transmission system is represented by introducing the signal of the motor rotary transformer sensor, the comprehensive backlash value of the transmission system can be measured without external equipment and a measuring tool, the operation is convenient and fast, the method can be applied to software control, and the method is suitable for large-scale popularization and application. And therefore, the problem of vehicle jitter caused by backlash dispersion difference can be accurately optimized with better related control parameters.

Description

Technical Field

[0001] The present invention relates to the field of automobile transmission systems, and in particular to a method and system for conveniently measuring comprehensive backlash of a vehicle transmission system. Background Art

[0002] In the development of electric and hybrid vehicles, the power transmission of the drive motor is usually achieved through gears and rigid shafts. However, during the process of the motor torque conversion from positive to negative, vehicle vibration becomes a common fault problem of electric or hybrid vehicles. Figure 1 As shown in the figure, the backlash effect of the transmission system is one of the key factors causing abnormal jitter. When the torque is negative, the meshing of gears A and B contacts on one side (such as the left side), and there is a gap on the other side; when the torque change is zero, the tooth surfaces of A and B are not in contact, indicating that the backlash is in a completely empty state; when the torque is positive, gears A and B contact on the other side (such as the right side), completing the torque transmission. It can be seen that the backlash causes a short-term powerless transmission area (gap band) when the gears reverse or switch the driving direction, which is the main reason for the decline in efficiency and jitter of the transmission system.

[0003] At present, the measurement of tooth clearance is mainly carried out by detecting the tooth clearance values ​​of each sub-component, such as the tooth clearance of the gearbox assembly and the tooth clearance of the meshing gears of each shaft, but the sum of the tooth clearance values ​​of these sub-components cannot accurately represent the comprehensive tooth clearance of the assembled transmission system. The existing tooth clearance measurement methods rely on special tooling and measuring equipment. The applicable scenarios of tooling are limited. Usually, only a single component can be tested, and it is difficult to conveniently and accurately measure the comprehensive tooth clearance of the vehicle transmission system. Therefore, after installation, it is difficult to have a convenient way to determine whether the tooth clearance of the transmission system is too large. It is usually necessary to judge by replacing hardware, which increases the investment of time and cost. There is an urgent need for a method that can conveniently measure the comprehensive tooth clearance of a vehicle transmission system. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a method and system for conveniently measuring the comprehensive tooth clearance of a vehicle transmission system. The change of the tooth clearance of the transmission system is characterized by introducing the signal of a motor resolver sensor without the need for external equipment and measuring tooling. The method is easy to operate and can be applied in software control to have better relevant control parameters and accurately optimize the vehicle jitter problem caused by tooth clearance dispersion.

[0005] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0006] According to a first aspect of the present invention, a method for conveniently measuring the comprehensive backlash of a vehicle transmission system is provided, wherein the change of the backlash of the transmission system is characterized by introducing a signal of a motor resolver sensor, and the method specifically comprises the following steps:

[0007] Step S1. Initial measurement: When the vehicle is on a flat road and is stationary, switch to N gear or P gear and record the resolver angle measured by the motor resolver sensor, which is recorded as ;

[0008] Step S2. Dynamic measurement: While keeping the vehicle stationary, switch from N gear or P gear to D gear, and record the resolver angle measured by the motor resolver sensor again, which is recorded as

[0009] Step S3. Measure the single backlash value multiple times : Repeat steps S1 and S2 for n measurements, and record the resolver angle each time the gear is switched , calculate the single backlash measurement value according to the following formula :

[0010]

[0011] in, is the resolver angle of P or N gear, is the rotation angle of D gear, is the pole pair number;

[0012] Step S4. Calculate the comprehensive backlash value: Calculate the single backlash value measured each time The average value of the comprehensive backlash value is obtained .

[0013] Optionally, n is 2 or 3.

[0014] Optionally, in step S4, the comprehensive backlash value is calculated by the following formula: .

[0015] According to a second aspect of the present invention, a system for conveniently measuring the comprehensive backlash of a vehicle transmission system is provided, which is used to implement the above-mentioned method for conveniently measuring the comprehensive backlash of a vehicle transmission system.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The method and system for conveniently measuring the comprehensive backlash of a vehicle transmission system provided by the present invention do not require additional tooling and sensors. The angle change is tested by the resolver sensor provided by the motor, and the size of the comprehensive backlash is calculated by the angle change. The testing process is simple, economical, fast, and relatively accurate. In addition, the application scenarios can also be relatively wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 A schematic diagram of the backlash effect of a transmission system in the prior art;

[0020] Figure 2 A simplified flow chart of the method for conveniently measuring the comprehensive backlash of a vehicle transmission system provided in the first embodiment;

[0021] Figure 3 A flow chart of the steps of the method for conveniently measuring the comprehensive backlash of a vehicle transmission system provided in the first embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] Embodiment 1:

[0025] The resolver sensor of the vehicle's motor can accurately sense the slight changes in the rotation angle. It is mainly used to monitor the rotation position, speed and rotation direction of the motor rotor, and its measurement accuracy is very high. Backlash is an important factor affecting the normal operation of the transmission system, especially the relative movement between the motor and the drive shaft. The rotation of the motor stator and rotor is achieved through the drive shaft, and the change of backlash will directly affect the rotation state of the drive shaft. When backlash deviation occurs in the transmission system, it will cause slight fluctuations or jitters in the drive shaft, and this change can be accurately reflected by the motor resolver sensor. Therefore, in electric or hybrid vehicles, the rotation of the motor stator is closely related to the change of backlash in the transmission system. The motor resolver sensor can detect the rotation of the motor stator in real time, and thus indirectly reflect the change of backlash. When the vehicle switches between different gears, the change of backlash will affect the rotation state of the transmission system. The motor resolver sensor can accurately capture these changes and calculate the comprehensive backlash.

[0026] According to the above principles, this embodiment provides a method for conveniently measuring the comprehensive backlash of a vehicle transmission system. This method does not require external equipment and measuring fixtures, but instead introduces the signal change of the motor resolver sensor of the automobile motor to characterize the change of the comprehensive backlash of the transmission system. The method is easy to operate and can be applied in software control to have better relevant control parameters and accurately optimize the vehicle jitter problem caused by backlash dispersion. The method specifically includes the following steps:

[0027] Step S1: Initial measurement (stationary state): When the vehicle is on a flat road and stationary, switch to N gear or P gear. At this time, record the resolver angle measured by the motor resolver sensor, which is recorded as (Unit: °).

[0028] Step S2: Dynamic measurement (gear shifting state): When the vehicle is stationary, switch from N gear or P gear to D gear. At this time, the rotation of the motor will cause a certain change in the tooth gap. Record the resolver angle measured by the motor resolver sensor again, which is recorded as (Unit: °).

[0029] Step S3: Measure the single backlash value multiple times: Repeat steps 1 and 2 to perform n measurements, and record the resolver angle each time the gear is switched. To improve the measurement accuracy, the value of n can be set according to actual needs. It is generally recommended to take 2-3 times. Calculate the single backlash measurement value according to the following formula :

[0030]

[0031] in, is the resolver angle of P or N gear, is the rotation angle of D gear, is the pole pair number.

[0032] Step S4: Calculate the comprehensive backlash value: The single backlash value measured each time The average value calculated by the following formula is the comprehensive backlash :

[0033]

[0034] Through the high-precision measurement of the motor resolver sensor, the change of the tooth gap can be accurately reflected, thereby realizing the effective test of the comprehensive tooth gap of the vehicle transmission system. This method avoids the limitations of the traditional reliance on tooling to measure the tooth gap of a single component, and provides a convenient and accurate means of tooth gap evaluation. At the same time, the comprehensive tooth gap value of the transmission system measured by the above method can be applied to the vehicle's software control system, thereby optimizing the relevant vehicle control parameters and accurately optimizing the vehicle jitter problem caused by tooth gap deviation.

[0035] In addition, the purpose of the present invention can also be achieved by characterizing the change of the comprehensive backlash of the transmission system through the signal change of the angle position sensor at other positions of the transmission shaft and calculating the comprehensive backlash of the transmission system.

[0036] Embodiment 2:

[0037] This embodiment provides a system for conveniently measuring the comprehensive backlash of a vehicle transmission system, which is used to implement the method for conveniently measuring the comprehensive backlash of a vehicle transmission system in the first embodiment, and provide backlash data to the control software, adjust the optimal control parameters according to the backlash parameters, and optimize the vehicle jitter problem.

[0038] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A method for conveniently measuring the comprehensive backlash of a vehicle transmission system, characterized in that: The change of the gear gap of the transmission system is characterized by introducing the signal of the motor resolver sensor, which specifically includes the following steps: Step S1. Initial measurement: When the vehicle is on a flat road and is stationary, switch to N gear or P gear and record the resolver angle measured by the motor resolver sensor, which is recorded as ; Step S2. Dynamic measurement: While keeping the vehicle stationary, switch from N gear or P gear to D gear, and record the resolver angle measured by the motor resolver sensor again, which is recorded as Step S3. Measure the single backlash value multiple times : Repeat steps S1 and S2 for n measurements, and record the resolver angle each time the gear is switched , calculate the single backlash measurement value according to the following formula : in, is the resolver angle of P or N gear, is the rotation angle of D gear, is the pole pair number; Step S4. Calculate the comprehensive backlash value: Calculate the single backlash value measured each time The average value of the comprehensive backlash value is obtained .

2. The method for conveniently measuring the comprehensive backlash of a vehicle transmission system according to claim 1, characterized in that: n is 2 or 3.

3. The method for conveniently measuring the comprehensive backlash of a vehicle transmission system according to claim 1, characterized in that: In step S4, the comprehensive backlash value is calculated by the following formula: .

4. A system for conveniently measuring the comprehensive backlash of a vehicle transmission system, characterized in that: Used to implement the method for conveniently measuring the comprehensive backlash of a vehicle transmission system as described in any one of claims 1 to 3.

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