CN111157239B - Control method for no-load torque of speed reducing mechanism in electric steering system - Google Patents
Control method for no-load torque of speed reducing mechanism in electric steering system Download PDFInfo
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- CN111157239B CN111157239B CN201911362990.2A CN201911362990A CN111157239B CN 111157239 B CN111157239 B CN 111157239B CN 201911362990 A CN201911362990 A CN 201911362990A CN 111157239 B CN111157239 B CN 111157239B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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Abstract
The invention provides a method for controlling the no-load torque of a speed reducing mechanism in an electric steering system, which comprises the following steps: assembling the worm and gear to be detected in any pair to form a worm and gear speed reducing mechanism; carrying out no-load detection on the assembled worm and gear speed reducing mechanism to obtain initial no-load torque data of the speed reducing mechanism; matching equipment parameters of running-in of the assembly according to an experience base based on the initial data of the no-load torque of the speed reducing mechanism; using matched equipment parameters to grind in the worm and gear speed reducing mechanism; and (4) carrying out no-load detection on the worn-in worm and gear speed reducing mechanism again, and taking the qualified detection as a finished product. The control method of the invention can effectively improve the fault tolerance rate and reduce the labor cost and the management cost.
Description
Technical Field
The invention relates to the technical field of processing of transmission parts of electric steering gears, in particular to a method for controlling no-load torque of a speed reducing mechanism in an electric steering system.
Background
An electric power steering system (EPS) basically includes: a steering mechanism, a torque sensor, and a controller (ECU). The worm gear speed reducing mechanism in the steering mechanism is the most commonly used mechanism for transmitting power at present. The manufacturing process of the mechanism is roughly divided into three procedures of worm and gear assembly, assembly running-in and no-load detection, wherein the key characteristic procedure is no-load detection, and the magnitude of the input torque of the full stroke when no power is supplied needs to be detected. The factors influencing the magnitude of the no-load torque are mainly the size of the worm wheel and the size of the worm, and the effect of the assembly after running-in. Therefore, how to control the detection result of the process to maximize the first-time yield becomes a crucial problem.
As shown in fig. 1, in the prior art, for the control of the process, a worm wheel and a worm are generally grouped according to the size, the size of each gear of the worm wheel spans only 0.01mm, the size of the worm spans 0.02, and the process is generally divided into 5-10 gears. And then assembling the worm and gear according to the corresponding gears, then carrying out assembly running-in, and finally carrying out no-load detection. The method can really realize the management and control of the size of the empty load, but has low fault tolerance rate and higher labor cost and management cost.
Disclosure of Invention
The invention aims to provide a control method for the no-load torque of a speed reducing mechanism in an electric steering system, which can effectively improve the fault-tolerant rate and reduce the labor cost and the management cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for no-load torque of a speed reducing mechanism in an electric power steering system comprises the following steps:
s1, assembling the worm gears to be detected in any pairing mode to form a worm gear speed reducing mechanism;
s2, carrying out no-load detection on the assembled worm and gear speed reducing mechanism to obtain initial no-load torque data of the speed reducing mechanism;
s3, matching equipment parameters of the running-in of the assembly according to an experience base based on the initial data of the no-load torque of the speed reducing mechanism;
s4, running in the worm gear and worm speed reducing mechanism by using matched equipment parameters;
and S5, carrying out no-load detection on the worn-in worm gear and worm speed reducing mechanism again, and taking the qualified detection as a finished product.
Further, the method further comprises:
and S6, if the no-load detection is qualified again in the step S5, adding the initial no-load torque data of the speed reducing mechanism corresponding to the worm and gear speed reducing mechanism and the equipment parameters of the assembly running-in into the experience library.
Further, in steps S2 and S3, the deceleration mechanism idling torque initial data is uploaded to the MES system, and the MES system automatically matches the equipment parameters of the running-in assembly in the experience base.
Further, the equipment parameters of the assembly running-in comprise rotating speed, running-in times, running-in time and running-in load.
Further, the equipment parameter of the running-in of the assembly is positively correlated with the initial data of the no-load torque of the speed reducing mechanism.
The invention has the following beneficial effects:
the control method of the invention omits the prior process of assembling the worm gears in groups, puts variable factors on the parameters of assembly running-in, improves the primary qualified rate by 20% by detecting no-load initial data in advance and then selecting running-in parameters to carry out assembly running-in based on the initial data, and omits the process of manually selecting and grouping in the prior method, thereby greatly reducing the labor cost and the management cost.
Drawings
Fig. 1 is a basic flow chart of a speed reducing mechanism no-load torque control method in the prior art.
Fig. 2 is a basic flow chart of the speed reducing mechanism no-load torque control method.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
As shown in fig. 2, an embodiment of the present invention provides a method for controlling an idling torque of a speed reduction mechanism in an electric power steering system, including the steps of: assembling the worm and gear to be detected in any pair to form a worm and gear speed reducing mechanism; carrying out no-load detection on the assembled worm and gear speed reducing mechanism to obtain initial no-load torque data of the speed reducing mechanism, and uploading the initial no-load torque data to an MES (manufacturing execution system); automatically matching equipment parameters of running-in of the assembly in an experience library by the MES system, wherein the equipment parameters comprise rotating speed, running-in times, running-in time and running-in load, and controlling the equipment to run-in the speed reducing mechanism according to the matched parameters; and after the running-in is finished, carrying out no-load detection on the speed reducing mechanism again, taking the qualified speed reducing mechanism as a finished product, and adding the initial data of the no-load torque of the speed reducing mechanism corresponding to the finished product and the equipment parameters of the running-in of the assembly into an experience library.
Normally, the equipment parameters of the running-in of the assembly are positively correlated with the initial data of the no-load torque of the speed reducing mechanism. At the beginning, the running-in parameters corresponding to each torque range can be configured after being grouped through data analysis for many times, and some experience parameters are obtained and used as initial data of an experience library.
The following is a further description by way of specific examples.
Example 1
The worm and gear speed reducing mechanisms assembled in any pair flow into a first no-load detection process, the average no-load torque obtained after the detection is 2.27 N.m, and then flow into a next process, and a sub-assembly running-in process is performed; after the data are measured, uploading the data to an MES system, and automatically configuring the parameters of the sub-assembly running-in process after the system analyzes according to an experience base, wherein the rotating speed is 400r/m, the time is 5s, the running-in times are 4 times, and the load is 63 N.m; and (4) after the running-in is finished, the next-sequence no-load detection is carried out, and after the test, the obtained no-load average torque is 1.22 N.m, and the result meets the requirement of a drawing. Flow into the next sequence.
Example 2
The worm and gear speed reducing mechanisms assembled in any pair flow into a first no-load detection process, the average no-load torque obtained after the detection is 1.87 N.m, and then flow into a next process, and a sub-assembly running-in process is performed; after the data are measured, uploading the data to an MES system, and automatically configuring the parameters of the sub-assembly running-in process after the system analyzes according to an experience base, wherein the rotating speed is 300r/m, the time is 4s, the running-in times are 3 times, and the load is 53 N.m; and (4) after the running-in is finished, the next-sequence no-load detection is carried out, and after the test, the obtained no-load average torque is 1.14 N.m, and the result meets the requirement of a drawing. Flow into the next sequence.
Through repeated tests of the applicant, the process in the embodiment can improve the first-time qualified rate of no-load torque detection of the speed reducing mechanism to 96%, reduce the labor cost of size selection and obtain good economic benefit.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (3)
1. A method for controlling the no-load torque of a speed reducing mechanism in an electric power steering system is characterized by comprising the following steps:
s1, assembling the worm gears to be detected in any pairing mode to form a worm gear speed reducing mechanism;
s2, carrying out no-load detection on the assembled worm and gear speed reducing mechanism to obtain initial no-load torque data of the speed reducing mechanism;
s3, matching equipment parameters of the running-in of the assembly according to an experience library based on the initial data of the no-load torque of the speed reducing mechanism, wherein the equipment parameters of the running-in of the assembly comprise a rotating speed, running-in times, running-in time and running-in load;
s4, running in the worm gear and worm speed reducing mechanism by using matched equipment parameters;
s5, carrying out no-load detection on the worn-in worm gear and worm speed reducing mechanism again, and taking the qualified detection as a finished product;
and S6, if the no-load detection is qualified again in the step S5, adding the initial no-load torque data of the speed reducing mechanism corresponding to the worm and gear speed reducing mechanism and the equipment parameters of the assembly running-in into the experience library.
2. The method for controlling idle torque of a reduction gear in an electric power steering system of claim 1, wherein in steps S2 and S3, the initial idle torque data of the reduction gear is uploaded to the MES system, and the MES system automatically matches the running-in equipment parameters of the assembly in an experience base.
3. The method of controlling the idling torque of the reduction mechanism in an electric power steering system according to claim 2, wherein the running-in apparatus parameter of the assembly is positively correlated with the reduction mechanism idling torque initial data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911362990.2A CN111157239B (en) | 2019-12-25 | 2019-12-25 | Control method for no-load torque of speed reducing mechanism in electric steering system |
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| CN201911362990.2A CN111157239B (en) | 2019-12-25 | 2019-12-25 | Control method for no-load torque of speed reducing mechanism in electric steering system |
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| CN111157239B true CN111157239B (en) | 2022-03-22 |
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| CN117620324A (en) * | 2023-12-21 | 2024-03-01 | 杭州新世宝电动转向系统有限公司 | Worm gear running-in device of steering gear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101476982B (en) * | 2009-01-23 | 2010-10-20 | 吉林大学 | Self-adapting cold grinding and hot testing apparatus for car engine |
| CN103364188B (en) * | 2013-07-16 | 2015-08-26 | 湖北航天技术研究院特种车辆技术中心 | A kind of running-in test method of automatic hydrodynamic transmission |
| CN104697785A (en) * | 2014-06-09 | 2015-06-10 | 三江瓦力特特种车辆有限公司 | System and method for testing no-load running-in of high-power hydraulic automatic gearbox |
| CN205352690U (en) * | 2016-01-06 | 2016-06-29 | 吉林大学 | Unloaded running -in test bench of high speed train gear box |
| CN108332968B (en) * | 2018-04-20 | 2024-03-29 | 福建工程学院 | Running-in test device for transmission of opposite-dragging type new energy automobile |
| CN110259939B (en) * | 2019-06-11 | 2020-11-10 | 中国第一汽车股份有限公司 | Running-in method, device, equipment and storage medium of automatic transmission |
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