Torque attenuation diagnosis method, device and equipment and computer readable storage medium

Abstract

The invention discloses a torque attenuation diagnosis method, device and equipment and a computer readable storage medium, and relates to the field of whole vehicle torque detection, and the method comprises the steps: obtaining the real-time driving mileage of a target vehicle under the current operation condition; for each target to-be-measured bolt point location on the target vehicle, screening out a target axial force attenuation curve corresponding to the target to-be-measured bolt point location and the current operation condition from an axial force attenuation curve library comprising axial force attenuation curves corresponding to each to-be-measured bolt point location under different operation conditions; determining an initial axial force corresponding to the initial driving mileage and a target axial force corresponding to the real-time driving mileage based on the target axial force attenuation curve; and determining a torque attenuation result of the target to-be-measured bolt point location according to the initial axial force and the target axial force. According to the method and the device, the torque attenuation of the chassis bolt fastener can be actively and effectively diagnosed in real time, the torque attenuation diagnosis does not need to be performed after the bolt fastener fails, and the effective monitoring of the bolt fastening connection in the whole life cycle of the vehicle is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of whole vehicle torque detection, in particular to a torque attenuation diagnosis method, device, equipment and computer readable storage medium. BACKGROUND

[0002] It can be understood that the torque attenuation of the bolt fastener in the vehicle chassis will directly threaten the structural integrity, driving safety, durability and compliance of the vehicle, for example, the bolt fastening failure in the user market may cause traffic accidents, therefore, the diagnosis and prevention of the torque attenuation of the bolt fastener in the chassis need to run through the whole life cycle of the vehicle; if it is not diagnosed, it will often become a "hidden killer" of vehicle safety, it can be seen that it is very important to realize the effectiveness monitoring of the key bolt fastening connection of the vehicle from the development stage to the whole life cycle.

[0003] In the related art, the torque attenuation diagnosis of the single-point bolt fastener with failure is usually performed only after the bolt fastener in the chassis has failure problems, which is a "sheep after the wolf" passive maintenance and cannot meet the requirements of modern vehicles for safety, economy and intelligence. Therefore, how to actively and in real time realize the effective diagnosis of the torque attenuation of the bolt fastener in the chassis is a problem to be solved at present. SUMMARY

[0004] The present application provides a torque attenuation diagnosis method, device, equipment and computer readable storage medium, which can actively and in real time realize the effective diagnosis of the torque attenuation of the bolt fastener in the chassis.

[0005] In a first aspect, an embodiment of the present application provides a torque attenuation diagnosis method, which comprises: obtaining a real-time driving mileage of a target vehicle under a current operating condition; for each target bolt point to be tested on the target vehicle, screening out a target axle force attenuation curve corresponding to the target bolt point to be tested and the current operating condition from a preset axle force attenuation curve library, the axle force attenuation curve library comprising axle force attenuation curves corresponding to each bolt point to be tested under different operating conditions; determining an initial axle force corresponding to the initial driving mileage and a target axle force corresponding to the real-time driving mileage based on the target axle force attenuation curve; determining a torque attenuation result of the target bolt point to be tested according to the initial axle force and the target axle force.

[0006] In combination with the first aspect, in an implementation mode, the determination of the torque attenuation result of the target bolt point to be tested according to the initial axle force and the target axle force comprises: determining a target axle force attenuation value based on the initial axle force and the target axle force; determining whether the target axial force attenuation value is greater than a first axial force attenuation threshold value, the first axial force attenuation threshold value being determined based on a bolt axial force design value corresponding to the target bolt point to be measured; if yes, determining that the target bolt point to be measured has a torque attenuation risk; if no, determining that the target bolt point to be measured does not have a torque attenuation risk.

[0007] In combination with the first aspect, in an implementation, after the step of determining that the target bolt point to be measured has a torque attenuation risk, the method further comprises: determining whether the target axial force attenuation value is greater than a second axial force attenuation threshold value, the second axial force attenuation threshold value being greater than the first axial force attenuation threshold value; if yes, determining that the bolt fastener at the target bolt point to be measured needs to be replaced; if no, re-executing the step of obtaining the real-time driving mileage of the target vehicle under the current operating condition.

[0008] In combination with the first aspect, in an implementation, the target axial force attenuation curve has a first mutation point and a second mutation point, and a curve slope between the first mutation point and the second mutation point is 0. After the step of determining the initial axial force corresponding to the initial driving mileage and the target axial force corresponding to the real-time driving mileage based on the target axial force attenuation curve, the method further comprises: when it is detected that the target axial force is located before the first mutation point on the target axial force attenuation curve, determining that the target bolt point to be measured does not have a torque attenuation risk; when it is detected that the target axial force is located between the first mutation point and the second mutation point on the target axial force attenuation curve, determining that the target bolt point to be measured has a torque attenuation risk; when it is detected that the target axial force is located after the second mutation point on the target axial force attenuation curve, determining that the bolt fastener at the target bolt point to be measured needs to be replaced.

[0009] In combination with the first aspect, in an implementation, the torque attenuation diagnosis method further comprises: controlling a test vehicle to drive under different operating conditions; for each bolt point to be measured on the test vehicle, performing axial force collection based on an axial force bolt at the bolt point to be measured, to obtain test axial forces corresponding to the bolt point to be measured at different driving mileages under different operating conditions, the axial force bolt being integrated with an axial force collection sensor and an axial force transmission medium; constructing an axial force attenuation curve of the bolt point to be measured under different operating conditions according to the test axial forces and the corresponding driving mileages.

[0010] In combination with the first aspect, in an implementation, before the step of controlling the test vehicle to drive under different operating conditions, the method further comprises: determining all to-be-tested bolt positions based on a preset suspension hard point structure form; arranging an axial force bolt at each to-be-tested bolt position.

[0011] In combination with the first aspect, in an implementation, after the step of collecting axial forces based on the axial force bolts at the to-be-tested bolt positions to obtain test axial forces of the to-be-tested bolt positions at different driving distances under different operating conditions, the method further comprises: for each to-be-tested bolt position, determining a test torque attenuation result of the to-be-tested bolt position at different driving distances under different operating conditions based on the test axial forces of the to-be-tested bolt position at different driving distances under different operating conditions; when it is detected that the test torque attenuation result of the to-be-tested bolt position is at a risk of torque attenuation or the bolt fastener needs to be replaced, counting the attenuation of the to-be-tested bolt position to obtain an attenuation statistical value; determining an inspection and optimization order of all to-be-tested bolt positions in a descending order of the attenuation statistical values;

[0012] In a second aspect, an embodiment of the present application provides a torque attenuation diagnosis device, which comprises: a data acquisition module configured to acquire a real-time driving distance of a target vehicle under a current operating condition; a curve screening module configured to screen, for each target to-be-tested bolt position on the target vehicle, a target axial force attenuation curve corresponding to the target to-be-tested bolt position and the current operating condition from a preset axial force attenuation curve library, the axial force attenuation curve library comprising axial force attenuation curves corresponding to each to-be-tested bolt position under different operating conditions; an axial force determination module configured to determine an initial axial force corresponding to a starting driving distance and a target axial force corresponding to the real-time driving distance based on the target axial force attenuation curve; an attenuation diagnosis module configured to determine a torque attenuation result of the target to-be-tested bolt position according to the initial axial force and the target axial force.

[0013] In combination with the second aspect, in an implementation, the attenuation diagnosis module is specifically configured to: determine a target axial force attenuation value based on the initial axial force and the target axial force; determine whether the target axial force attenuation value is greater than a first axial force attenuation threshold value, the first axial force attenuation threshold value being determined based on a bolt axial force design value corresponding to the target to-be-tested bolt position; if yes, it is determined that the target to-be-tested bolt position is at a risk of torque attenuation. If no, it is determined that the target bolt point position does not have a torque decay risk.

[0014] In combination with the second aspect, in an embodiment, the decay diagnosis module is further configured to: determine whether the target axial force decay value is greater than a second axial force decay threshold value, the second axial force decay threshold value being greater than the first axial force decay threshold value; if yes, it is determined that the bolt fastener at the target bolt point position needs to be replaced; if no, the step of obtaining the real-time driving mileage of the target vehicle under the current operating condition is re-executed.

[0015] In combination with the second aspect, in an embodiment, the target axial force decay curve has a first mutation point and a second mutation point, and a curve slope between the first mutation point and the second mutation point is 0, and the decay diagnosis module is further configured to: when it is detected that the target axial force is located before the first mutation point on the target axial force decay curve, it is determined that the target bolt point position does not have a torque decay risk; when it is detected that the target axial force is located between the first mutation point and the second mutation point on the target axial force decay curve, it is determined that the target bolt point position has a torque decay risk; when it is detected that the target axial force is located after the second mutation point on the target axial force decay curve, it is determined that the bolt fastener at the target bolt point position needs to be replaced.

[0016] In combination with the second aspect, in an embodiment, the torque decay diagnosis device further comprises a pre-diagnosis module configured to: control a test vehicle to drive under different operating conditions; for each bolt point position to be tested on the test vehicle, collect an axial force based on an axial force bolt at the bolt point position to be tested, to obtain a test axial force corresponding to the bolt point position to be tested at different driving mileages under different operating conditions, the axial force bolt being integrated with an axial force collection sensor and an axial force transmission medium; construct an axial force decay curve of the bolt point position to be tested under different operating conditions according to the test axial force and the corresponding driving mileage.

[0017] In combination with the second aspect, in an embodiment, the pre-diagnosis module is further configured to: determine all bolt point positions to be tested based on a preset suspension hard point structure form; arrange an axial force bolt on each bolt point position to be tested.

[0018] In combination with the second aspect, in an embodiment, the pre-diagnosis module is further configured to: For each to-be-tested bolt point, based on the test axial forces of the to-be-tested bolt point at different driving distances under different operating conditions, the test torque attenuation results of the to-be-tested bolt point at different driving distances under different operating conditions are determined; When it is detected that the test torque attenuation result of the to-be-tested bolt point is a torque attenuation risk or the bolt fastener needs to be replaced, attenuation counting is performed on the to-be-tested bolt point to obtain an attenuation statistical value; The point inspection and optimization order of all to-be-tested bolt points is determined in the order of the attenuation statistical values from large to small.

[0019] In a third aspect, the embodiments of the present application provide a torque attenuation diagnosis device, which comprises a processor, a memory, and a torque attenuation diagnosis program stored in the memory and executable by the processor, wherein the torque attenuation diagnosis program, when executed by the processor, implements the steps of the torque attenuation diagnosis method as described above.

[0020] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, which stores a torque attenuation diagnosis program, wherein the torque attenuation diagnosis program, when executed by a processor, implements the steps of the torque attenuation diagnosis method as described above.

[0021] The technical solutions provided by the embodiments of the present application have the following beneficial effects: The real-time driving distance of the target vehicle under the current operating condition is obtained, and for each target to-be-tested bolt point on the target vehicle, a target axial force attenuation curve corresponding to the target to-be-tested bolt point and the current operating condition is selected from a preset axial force attenuation curve library, so as to represent the theoretical axial forces corresponding to different driving distances of the target to-be-tested bolt point under the current operating condition through the target axial force attenuation curve. Therefore, the initial axial force corresponding to the starting driving distance and the target axial force corresponding to the real-time driving distance can be determined based on the target axial force attenuation curve, and finally the torque attenuation of the bolt fastener at the target to-be-tested bolt point can be diagnosed in real time according to the initial axial force and the target axial force. It can be seen that through the present application, effective diagnosis of the torque attenuation of the chassis bolt fastener can be actively and in real time, without waiting for the bolt fastener to fail before diagnosing the torque attenuation, thereby realizing effective monitoring of the bolt fastening connection in the whole life cycle of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The flowchart of the torque attenuation diagnosis method embodiment of the present application is shown; Figure 2 The detailed flowchart of step S40 in the torque attenuation diagnosis method embodiment of the present application is shown; Figure 1 Figure 3 ​The schematic diagram of the axle force attenuation curve involved in the embodiment of the present application is shown in the following figure. Figure 4 The schematic diagram of the function module of the torque attenuation diagnosis device embodiment of the present application is shown in the following figure. Figure 5 The schematic diagram of the hardware structure of the torque attenuation diagnosis device involved in the embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0023] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person of ordinary skill in the art without making the creative labor belong to the scope of protection of the present application.

[0024] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in further detail with reference to the drawings.

[0025] In the first aspect, the embodiments of the present application provide a torque attenuation diagnosis method.

[0026] In an embodiment, referring to the following figure, Figure 1 , Figure 1 The flowchart of the torque attenuation diagnosis method embodiment of the present application is shown in the following figure. As shown in the figure, Figure 1 the torque attenuation diagnosis method comprises: Step S10: obtaining the real-time driving mileage of the target vehicle under the current operating condition.

[0027] It is understood that the target vehicle refers to a vehicle that needs to be diagnosed for chassis torque attenuation, which can be a prototype vehicle, a mass-produced vehicle, or a vehicle in other stages, which is not limited herein. In addition, the present embodiment will construct the running conditions according to different levels of road surface and driving conditions. Specifically, the running conditions can be composed of multiple dimensions such as road conditions, loads, driving speeds, etc. Among them, the road surface condition category can be preferably divided into 3 levels: 1st level road surface, 2nd level road surface and 3rd level road surface. The 1st level road surface is asphalt and cement paving road surface, and the road surface has no damage except the normal road marking. The 2nd level road surface is damaged paving road surface, that is, the asphalt or cement paving road surface contains random damage phenomena such as joint groove or manhole cover. The 3rd level road surface is non-paved road surface, that is, gravel road or muddy road, etc. At the same time, the vehicle driving speed V can be preferably classified into low speed (such as V≤40Km / h), medium speed (V∈(40,80)Km / h), high speed (such as V∈[80,120]Km / h) these three driving conditions; the vehicle load is preferably divided into 1 person (light load), 3 people (half load), 5 people (full load) these three driving load conditions. It should be noted that the above classification of road conditions, loads and driving speeds is only for the presentation of the embodiment, and the classification can be adaptively adjusted according to the actual needs.

[0028] Based on this, 27 kinds of running conditions can be obtained by freely combining the above three dimensions; for example, running condition 1 is 1st level road surface, low speed and light load, running condition 2 is 1st level road surface, medium speed and light load, and so on. In the present embodiment, the real-time driving mileage of the target vehicle under the current running condition is obtained, so as to reflect the influence of the current environment on the chassis torque attenuation of the target vehicle through the current running condition and the real-time driving mileage.

[0029] Step S20: For each target bolt point on the target vehicle, a target axle force attenuation curve corresponding to the target bolt point and the current running condition is selected from a pre-set axle force attenuation curve library, and the axle force attenuation curve library includes axle force attenuation curves corresponding to each bolt point under different running conditions.

[0030] It is understood that for any vehicle, the bolt point where each bolt fastener installed on the chassis is the bolt point (i.e. the bolt point to be tested) for chassis torque attenuation diagnosis. Based on this, the target bolt point to be tested in the present embodiment refers to the bolt point to be tested that needs to be diagnosed for chassis torque attenuation. Since the method and principle of torque attenuation diagnosis of any target bolt point to be tested are similar, for the sake of simplicity, one of the target bolt points to be tested will be taken as an example for the explanation of torque attenuation diagnosis.

[0031] It should be understood that the axial force decay curve refers to the change of the axial force of the bolt fastener corresponding to different driving distances, that is, the bolt point position has different axial forces at different driving distances; in the embodiment, for each to-be-tested bolt point position at each operating condition, the axial force of the to-be-tested bolt point position at different driving distances is pre-calibrated by controlling the vehicle to drive at the operating condition, and then the axial force decay curve of the to-be-tested bolt point position at the operating condition is drawn according to the axial forces corresponding to all driving distances; after the axial force decay curves of all to-be-tested bolt point positions at different operating conditions are drawn, the axial force decay curve library is constructed. For example, the vehicle chassis includes to-be-tested bolt point position 1 and to-be-tested bolt point position 2, and the axial force decay curve corresponding to the to-be-tested bolt point position 1 includes the axial force decay curves corresponding to the 27 operating conditions respectively; similarly, the axial force decay curve corresponding to the to-be-tested bolt point position 2 also includes the axial force decay curves corresponding to the 27 operating conditions respectively, and the axial force decay curve library stores 54 axial force decay curves.

[0032] Based on this, for the target to-be-tested bolt point position, the target axial force decay curve corresponding to the target to-be-tested bolt point position and the current operating condition can be selected from the axial force decay curve library according to the corresponding relationship among the to-be-tested bolt point position, the operating condition and the axial force decay curve; for example, assuming that the target to-be-tested bolt point position is to-be-tested bolt point position 1 and the current operating condition is operating condition 1, 27 axial force decay curves corresponding to the to-be-tested bolt point position 1 can be selected from the axial force decay curve library, and then the axial force decay curve corresponding to the operating condition 1 is selected from the 27 axial force decay curves as the target axial force decay curve of the target to-be-tested bolt point position.

[0033] Further, in an embodiment, the torque decay diagnosis method further includes: controlling the test vehicle to drive at different operating conditions; for each to-be-tested bolt point position on the test vehicle, collecting the axial force based on the axial force bolt at the to-be-tested bolt point position to obtain the test axial force corresponding to the to-be-tested bolt point position at different driving distances at different operating conditions, the axial force bolt being integrated with an axial force collection sensor and an axial force transmission medium; constructing the axial force decay curve of the to-be-tested bolt point position at different operating conditions according to the test axial force and the driving distance corresponding thereto.

[0034] Exemplarily, in the embodiment, the axial force decay curves of different to-be-tested bolt point positions at different operating conditions are constructed in the form of experimental calibration; wherein the test vehicle refers to a vehicle used for calibrating the axial force decay curve, which can be a trial-manufactured vehicle, a mass-produced vehicle or a vehicle at other stages, which is not limited here.

[0035] Specifically, first, an axial force bolt is installed at each to-be-tested bolt point; it should be noted that the axial force bolt refers to an integrated axial force acquisition sensor (such as a strain gauge) and an axial force transmission medium for testing, wherein the axial force acquisition sensor such as a strain gauge is used for axial force conversion signal testing and acquisition, and the axial force transmission medium is used for data transmission, which is divided into wired transmission medium and wireless transmission medium, the wired transmission medium can be a wire, and the wireless transmission medium can be a Bluetooth module, a WiFi module, etc.; based on this, the axial force bolt can ensure that the vehicle can collect and record the axial fastening stress of the to-be-tested bolt point, without the need for additional axial force acquisition sensors and axial force transmission media, thereby effectively reducing the cost. It should be understood that, due to the influence of the installation point space, the axial force bolt is mostly a bolt fastener with a large volume structure, which is preferentially used for installation at the connection and fastening position of the vehicle chassis component.

[0036] Secondly, a channel is set, that is, an axial force diagnosis channel corresponding to each to-be-tested bolt point is set for each to-be-tested bolt point, so that each to-be-tested bolt point displays a diagnosis point, so as to realize the transmission of axial force data through the axial force diagnosis channel; then, axial force acquisition is performed, that is, the test vehicle is controlled to run under 27 kinds of operating conditions respectively, and the axial force at each to-be-tested bolt point under each operating condition is acquired, so as to obtain the data results (i.e., test axial force) of each to-be-tested bolt point under 27 kinds of constraint boundaries, and store them to the chassis domain control information; it should be noted that the test axial force data information acquired each time needs to match the real-time mileage information of the vehicle, the purpose being to record the axial force data collected under a certain condition as the mileage change data segment accumulated under the condition; finally, for each to-be-tested bolt point, the axial force decay curve of the to-be-tested bolt point under different operating conditions can be constructed according to the test axial force and the corresponding driving mileage.

[0037] It should be understood that when the test axial force of each to-be-tested bolt point under different constraint boundaries is acquired, it can also be stored in the form of a matrix table to the chassis domain control information, and the axial force decay change under different matrix tables recorded in the driving mileage segment is recorded, and the axial force change information in the driving mileage is distinguished according to different operating conditions in the chassis domain controller; after all operating conditions are completed, the axial force decay size and other information under different operating conditions are distinguished to form a matched decay information matrix table, and the axial force decay curve of different to-be-tested bolt points under different operating conditions is constructed according to the decay information matrix table.

[0038] In addition, the above recorded acquisition data can also be classified according to the suspension structure form, and the database accumulation record under different operating conditions is also carried out, so as to form the axial force decay change curve of a certain bolt point under the same type of operating condition in the database, thereby providing the design personnel and subsequent maintenance personnel with point inspection, improving the bolt fastening design efficiency and point inspection efficiency, and improving the accuracy of such work.

[0039] It should be noted that the digital process card and the physical process card of the on-site type can also be made according to the big data accumulation model in the database. The digital process card is a control program system, which is mainly written into a commercial vehicle for use by a user and matched with a road scanning system of the corresponding vehicle. The digital process card can accumulate the axial force decay of different road surfaces according to the mileage to form different bolt axial force records. If the axial force of a bolt decays to a pre-warning at a certain mileage, the display interface will give a pre-warning to the user to maintain or replace the fastening connection at the place. The physical process card is mainly used for vehicle assembly engineers or after-sales maintenance engineers. According to the corresponding database of the vehicle type, the physical process card can focus on the first axial force decay or check the bolt fastening one by one to improve the efficiency and accuracy of the vehicle fastener fastening point inspection, thereby reducing the labor cost, development cost and maintenance cost.

[0040] Further, in an embodiment, before the step of controlling the test vehicle to drive under different operating conditions, the method further comprises: determining all to-be-tested bolt positions based on a preset suspension hard point structure form; arranging an axial force bolt at each to-be-tested bolt position.

[0041] Exemplarily, in the embodiment, the axial force bolt is preferably a chassis structure fastening special-purpose bolt, which can be matched with all axial force bolts according to the suspension hard point design points, that is, different numbers of axial force bolts are matched according to the differences in suspension structure forms. It can be seen that the suspension hard point structure form determines the installation positions of the axial force bolts, that is, all to-be-tested bolt positions can be determined according to the suspension hard point structure form. Then, one axial force bolt is arranged at each to-be-tested bolt position. It should be noted that the suspension hard point structure form can be specifically divided into many structure forms such as the MacPherson suspension, the twist beam suspension, the multi-link suspension and the double wishbone suspension. Based on this, different to-be-tested bolt position axial force diagnosis channels can be matched according to different hard points, and each to-be-tested bolt position axial force diagnosis channel is named as a corresponding hard point connection for the subsequent processing of data information.

[0042] Further, in an embodiment, after the step of collecting the axial force of the axial force bolt at the to-be-tested bolt position to obtain the test axial force of the to-be-tested bolt position at different driving mileages under different operating conditions, the method further comprises: for each to-be-tested bolt position, determining a test torque decay result of the to-be-tested bolt position at different driving mileages under different operating conditions based on the test axial force of the to-be-tested bolt position at different driving mileages under different operating conditions; when it is detected that the test torque decay result of the to-be-tested bolt position is a torque decay risk or the bolt fastener needs to be replaced, performing decay counting on the to-be-tested bolt position to obtain a decay statistical value; The point inspection and optimization order of all the to-be-tested bolt points is determined according to the attenuation statistical values from large to small.

[0043] For example, if the attenuation value of the bolt point 1 at the mileage x1 is less than the attenuation threshold value, it is determined that the bolt point 1 at the mileage x1 does not have the risk of torque attenuation and does not need to replace the bolt fastener, and thus the attenuation counting is not needed.

[0044] If the attenuation value of the bolt point 1 at the mileage x1 is greater than or equal to the attenuation threshold value, it is determined that the bolt point 1 at the mileage x1 has the risk of torque attenuation or needs to replace the bolt fastener, and thus the attenuation warning is needed, and if the test vehicle is a development stage vehicle, the axle force optimization at this position needs to be carried out before the official launch, that is, the feedback needs to be output to the information storage, so that the designer can carry out matching optimization after checking, so as to improve the axle force requirement life, shorten the development cycle and save the cost; at the same time, the attenuation counting of the bolt point 1 is carried out; after the statistics of all the mileages are completed, the attenuation statistical value of the bolt point 1 can be obtained. It can be understood that the greater the attenuation statistical value is, the more the number of warnings is, and thus the bolt point needs to be inspected and optimized in priority. Therefore, all the to-be-tested bolt points can be sorted according to the attenuation statistical values from large to small, and then the point inspection and optimization of all the to-be-tested bolt points are carried out according to the sorting result, so as to effectively improve the efficiency and accuracy of the point inspection and optimization.

[0045] In addition, in order to more efficiently realize the axle force optimization, the test torque attenuation results of all the to-be-tested bolt points can be displayed in a visual manner, so that the staff can quickly locate the to-be-tested bolt points which have the risk of torque attenuation or need to replace the bolt fastener for point inspection and optimization. Specifically, the point inspection is carried out according to the attenuation order in combination with the vehicle suspension hard point structure form, and the optimization point inspection route points are set in layers, that is, the wheel center is taken as the upper and lower and front and rear center points, and the quadrant boundary is defined with the wheel center as the origin in the suspension side view, and the inboard and outboard points of the swing arm are distinguished, that is, the upper layer details of the hard points in a quadrant need to distinguish the inboard and outboard hard points of the vehicle, so as to improve the efficiency and accuracy of the axle force point inspection.

[0046] Step S30: determining an initial axle force corresponding to the initial driving mileage and a target axle force corresponding to the real-time driving mileage based on the target axle force decay curve.

[0047] For example, in this embodiment, after the target axle force decay curve is determined, the initial axle force at the initial driving mileage (i.e., the initial value of the bolt axial force, which will be used as a reference numerical point) and the target axle force corresponding to the real-time driving mileage can be determined according to the target axle force decay curve, so as to reflect the torque decay of the target bolt point to be tested through the initial axle force and the target axle force.

[0048] Step S40: determining the torque decay result of the target bolt point to be tested according to the initial axle force and the target axle force.

[0049] For example, in this embodiment, the difference between the initial axle force and the target axle force can be used to represent the axle force decay of the target bolt point to be tested, and the difference can be used to determine whether the target bolt point to be tested has a torque decay risk or whether the bolt fastener needs to be replaced. It can be seen that, through this embodiment, the effective diagnosis of the torque decay of the chassis bolt fastener can be actively and timely performed, without waiting for the bolt fastener to fail before performing the torque decay diagnosis, so as to realize the effectiveness monitoring of the bolt fastening connection in the whole life cycle of the vehicle, and to realize the efficiency improvement and cost reduction. For example, the mule vehicle torque assembly accounting matching period can be shortened to 3 days per vehicle, the mule vehicle loading stage can be shortened to 3 days x 10 vehicles = 30 days, and the human resources and design resources can be saved by 30000 yuan per stage vehicle model.

[0050] Further, referring to Figure 2 As shown in the figure, the determination of the torque decay result of the target bolt point to be tested according to the initial axle force and the target axle force comprises: Step S401: determining a target axle force decay value based on the initial axle force and the target axle force; Step S402: determining whether the target axle force decay value is greater than a first axle force decay threshold, the first axle force decay threshold being determined based on the bolt axial force design value corresponding to the target bolt point to be tested; Step S403: if yes, determining that the target bolt point to be tested has a torque decay risk; Step S404: if no, determining that the target bolt point to be tested does not have a torque decay risk.

[0051] Exemplarily, in the embodiment, the first axial force attenuation threshold refers to a boundary value of whether the bolt fastener has a torque attenuation risk, and the first axial force attenuation threshold at different bolt points can be different or the same, which is not limited herein; it should be noted that the specific value of the first axial force attenuation threshold needs to be determined according to the bolt axial force design value of the bolt fastener at the target bolt point, for example, for each target bolt point, one third of the bolt axial force design value thereof can be preferably taken as the first axial force attenuation threshold.

[0052] Based on this, the embodiment will first obtain the target axial force attenuation value of the target bolt point by calculating the difference between the target axial force and the initial axial force; then it is judged whether the target axial force attenuation value is greater than the first axial force attenuation threshold, if not, it indicates that the cumulative axial force of the target bolt point has not been attenuated to the boundary value of the bolt axial force design value, and then it is determined that the target bolt point does not have a torque attenuation risk; if yes, it indicates that the cumulative axial force of the target bolt point has been attenuated to the boundary value of the bolt axial force design value, and then it is determined that the target bolt point has a torque attenuation risk; at this time, the vehicle display interface will appear a warning (such as a yellow light warning), and display that the axial force attenuation or the bolt chain connection has a risk of imminent failure, that is, the vehicle needs to be parked to check the bolt torque loosening situation, so as to ensure that the vehicle will not appear the shaft breakage or other severe traffic accidents caused by the failure of the fastening connection, thereby solving the problem of traffic accident warning caused by the failure of the bolt fastening in the market.

[0053] Further, in an embodiment, after the step of determining that the target bolt point has a torque attenuation risk, the method further comprises: judging whether the target axial force attenuation value is greater than a second axial force attenuation threshold, the second axial force attenuation threshold being greater than the first axial force attenuation threshold; if yes, it is determined that the bolt fastener at the target bolt point needs to be replaced; if not, the step of obtaining the real-time driving mileage of the target vehicle under the current operating condition is re-executed.

[0054] Exemplarily, in the embodiment, the second axial force attenuation threshold refers to a boundary value of whether the bolt connection is basically failed (or has been failed), and the second axial force attenuation threshold at different bolt points can be different or the same, which is not limited herein; it should be noted that the specific value of the second axial force attenuation threshold also needs to be determined according to the bolt axial force design value of the bolt fastener at the target bolt point and needs to be greater than the first axial force attenuation threshold, for example, for each target bolt point, two thirds of the bolt axial force design value thereof can be preferably taken as the second axial force attenuation threshold.

[0055] Based on this, after determining that the target bolt point position exists a torque attenuation risk, it is further determined whether the target axial force attenuation value is greater than the second axial force attenuation threshold. If not, it indicates that the target bolt point position only exists a torque attenuation risk, and the bolt connection thereon has not failed, and then the torque attenuation monitoring is continued. If yes, it indicates that the bolt connection on the target bolt point position has been basically failed or has failed, and the functional integrity needs to be checked, and then it is determined that the bolt fastener at the target bolt point position needs to be replaced. At this time, the vehicle display interface will appear a warning (such as a red light warning), and display a parking inspection or directly replace the bolt fastener there. It should be understood that when there are several target bolt point positions that need to be point inspected and optimized at the same time, the after-sales maintenance personnel can determine the point inspection and optimization order according to the warning light color, that is, the point inspection and optimization order of the target bolt point position corresponding to the red light warning is earlier than the point inspection and optimization order of the target bolt point position corresponding to the yellow light warning.

[0056] Further, in an embodiment, the target axial force attenuation curve has a first mutation point and a second mutation point, and the curve slope between the first mutation point and the second mutation point is 0. After determining the initial axial force corresponding to the initial driving mileage and the target axial force corresponding to the real-time driving mileage based on the target axial force attenuation curve, the method further comprises: When it is detected that the target axial force is located before the first mutation point on the target axial force attenuation curve, it is determined that the target bolt point position does not exist a torque attenuation risk. When it is detected that the target axial force is located between the first mutation point and the second mutation point on the target axial force attenuation curve, it is determined that the target bolt point position exists a torque attenuation risk. When it is detected that the target axial force is located after the second mutation point on the target axial force attenuation curve, it is determined that the bolt fastener at the target bolt point position needs to be replaced.

[0057] For example, as shown in Figure 3 The target axial force attenuation curve usually has a first mutation point A and a second mutation point B, and the curve slope between the first mutation point A and the second mutation point B is 0, indicating that the bolt connection has appeared a failure risk. Based on this, as shown in Figure 3If the target axial force F is detected to be located before the first mutation point A on the target axial force decay curve, it indicates that the bolt connection at the target bolt point to be measured does not have a torque decay risk, and the torque decay monitoring is continued. If the target axial force F is detected to be located between the first mutation point A and the second mutation point B on the target axial force decay curve, it indicates that the cumulative axial force of the target bolt point to be measured has decayed to the bolt axial force design value boundary, and it is determined that the target bolt point to be measured has a torque decay risk. If the target axial force F is located after the second mutation point B on the target axial force decay curve, it indicates that the bolt connection at the target bolt point to be measured has been basically failed or has failed, and the functional integrity needs to be checked, and it is determined that the bolt fastener at the target bolt point to be measured needs to be replaced.

[0058] In a second aspect, the embodiments of the present application further provide a torque decay diagnosis device.

[0059] In an embodiment, the torque decay diagnosis device comprises a data acquisition module, a curve screening module, an axial force determination module, and a decay diagnosis module. Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a function module of a torque decay diagnosis device according to an embodiment of the present application. As shown in FIG. 1, the torque decay diagnosis device comprises: Figure 4 a data acquisition module, configured to acquire a real-time driving mileage of a target vehicle under a current operating condition; a curve screening module, configured to screen, for each target bolt point to be measured on the target vehicle, a target axial force decay curve corresponding to the target bolt point to be measured and the current operating condition from a preset axial force decay curve library, the axial force decay curve library comprising axial force decay curves corresponding to each bolt point to be measured under different operating conditions; an axial force determination module, configured to determine an initial axial force corresponding to a starting driving mileage and a target axial force corresponding to the real-time driving mileage based on the target axial force decay curve; a decay diagnosis module, configured to determine a torque decay result of the target bolt point to be measured according to the initial axial force and the target axial force.

[0060] Further, in an embodiment, the decay diagnosis module is specifically configured to: determine a target axial force decay value based on the initial axial force and the target axial force; determine whether the target axial force decay value is greater than a first axial force decay threshold value, the first axial force decay threshold value being determined based on a bolt axial force design value corresponding to the target bolt point to be measured; if yes, it is determined that the target bolt point to be measured has a torque decay risk; if no, it is determined that the target bolt point to be measured does not have a torque decay risk.

[0061] Further, in an embodiment, the decay diagnosis module is further configured to:​ determining whether the target axial force decay value is greater than a second axial force decay threshold value, the second axial force decay threshold value being greater than the first axial force decay threshold value; if yes, determining that the bolt fastener at the target bolt point needs to be replaced; if no, re-executing the step of obtaining the real-time driving mileage of the target vehicle under the current operating condition.

[0062] Further, in an embodiment, the target axial force decay curve has a first mutation point and a second mutation point, the curve slope between the first mutation point and the second mutation point is 0, and the decay diagnosis module is further configured to: when it is detected that the target axial force is located before the first mutation point on the target axial force decay curve, determining that the target bolt point does not have a torque decay risk; when it is detected that the target axial force is located between the first mutation point and the second mutation point on the target axial force decay curve, determining that the target bolt point has a torque decay risk; when it is detected that the target axial force is located after the second mutation point on the target axial force decay curve, determining that the bolt fastener at the target bolt point needs to be replaced.

[0063] Further, in an embodiment, the torque decay diagnosis device further comprises a pre-diagnosis module configured to: controlling a test vehicle to drive under different operating conditions; for each bolt point to be tested on the test vehicle, collecting an axial force at the bolt point to be tested based on an axial force bolt at the bolt point to be tested, to obtain a test axial force corresponding to the bolt point to be tested at different driving mileages under different operating conditions, the axial force bolt being integrated with an axial force collection sensor and an axial force transmission medium; constructing an axial force decay curve of the bolt point to be tested under different operating conditions according to the test axial force and the corresponding driving mileage.

[0064] Further, in an embodiment, the pre-diagnosis module is further configured to: determining all bolt points to be tested based on a preset suspension hard point structure form; arranging an axial force bolt on each bolt point to be tested.

[0065] Further, in an embodiment, the pre-diagnosis module is further configured to: for each bolt point to be tested, determining a test torque decay result of the bolt point to be tested at different driving mileages under different operating conditions based on the test axial force corresponding to the bolt point to be tested at different driving mileages under different operating conditions; When it is detected that the test torque attenuation result of the to-be-tested bolt point position is torque attenuation risk or the bolt fastener needs to be replaced, attenuation counting is performed on the to-be-tested bolt point position to obtain an attenuation statistical value; The point inspection and optimization order of all to-be-tested bolt point positions is determined in descending order of the attenuation statistical value.

[0066] The functions of each module in the torque attenuation diagnosis device correspond to each step in the torque attenuation diagnosis method, and the functions and implementation processes are not repeated here.

[0067] In a third aspect, the embodiments of the present application provide a torque attenuation diagnosis device. The torque attenuation diagnosis device can be a personal computer (PC), a notebook computer, a server, or other devices with data processing functions.

[0068] Reference Figure 5 , Figure 5 is a schematic diagram of the hardware structure of the torque attenuation diagnosis device involved in the embodiments of the present application. In the embodiments of the present application, the torque attenuation diagnosis device can include a processor, a memory, a communication interface, and a communication bus.

[0069] The communication bus can be of any type, used to interconnect the processor, the memory, and the communication interface.

[0070] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, and other interfaces used to interconnect devices inside the torque attenuation diagnosis device, and interfaces used to interconnect the torque attenuation diagnosis device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0071] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disks, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0072] The processor can be a general processor, which can invoke a torque attenuation diagnosis program stored in the memory and execute the torque attenuation diagnosis method provided by the embodiments of the present application. For example, the general processor can be a central processing unit (CPU). The method executed when the torque attenuation diagnosis program is invoked can refer to the embodiments of the torque attenuation diagnosis method of the present application, which will not be described herein.

[0073] Those skilled in the art can understand that the hardware structure shown in the foregoing embodiments is not a limitation to the present application, and can include more or less components, or combine certain components, or arrange different components. Figure 5 The hardware structure shown in the foregoing embodiments is not a limitation to the present application, and can include more or less components, or combine certain components, or arrange different components.

[0074] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium.

[0075] The torque attenuation diagnosis program stored on the computer readable storage medium of the present application, when executed by the processor, implements the steps of the torque attenuation diagnosis method described above.

[0076] The method implemented when the torque attenuation diagnosis program is executed can refer to the embodiments of the torque attenuation diagnosis method of the present application, which will not be described herein.

[0077] It should be noted that the serial numbers of the embodiments of the present application described above are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0078] The terms "comprising" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover not exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. The terms "first", "second" and "third" and the like descriptions are used to distinguish different objects, and do not represent the order or limit the types of "first", "second" and "third".

[0079] In the description of the embodiments of the present application, "exemplary", "for example" or "for instance" is used to mean as an example, illustration or description. Any embodiment or design scheme described as "exemplary", "for example" or "for instance" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words "exemplary", "for example" or "for instance" are intended to present the relevant concept in a specific manner.

[0080] In the description of the embodiments of the present application, unless otherwise specified, " / " means the meaning of or, for example, A / B can mean A or B; the text "and / or" only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0081] In some of the processes described in the embodiments of the present application, a plurality of operations or steps are included in a specific order, but it should be understood that these operations or steps can be executed or in parallel without the order in which they appear in the embodiments of the present application, and the serial number of the operation is only used to distinguish different operations, and the serial number itself does not represent any execution order. In addition, these processes can include more or fewer operations, and these operations or steps can be executed in sequence or in parallel, and these operations or steps can be combined.

[0082] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, an optical disk) as described above, and includes a plurality of instructions for making a terminal device execute the method described in each embodiment of the present application.

[0083] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A torque decay diagnostic method characterized by, The torque decay diagnosis method comprises: obtaining a real-time driving mileage of a target vehicle under a current operating condition; for each target bolt point to be tested on the target vehicle, screening a target axle force decay curve corresponding to the target bolt point to be tested and the current operating condition from a preset axle force decay curve library, the axle force decay curve library comprising axle force decay curves corresponding to each bolt point to be tested under different operating conditions; determining an initial axle force corresponding to the initial driving mileage and a target axle force corresponding to the real-time driving mileage based on the target axle force decay curve; determining a torque decay result of the target bolt point to be tested according to the initial axle force and the target axle force.

2. The torque decay diagnostic method of claim 1, wherein, The determination of the torque decay result of the target bolt point to be tested according to the initial axle force and the target axle force comprises: determining a target axle force decay value based on the initial axle force and the target axle force; judging whether the target axle force decay value is greater than a first axle force decay threshold value, the first axle force decay threshold value being determined based on a bolt axle force design value corresponding to the target bolt point to be tested; if yes, it is determined that the target bolt point to be tested has a torque decay risk; if no, it is determined that the target bolt point to be tested does not have a torque decay risk.

3. The torque decay diagnostic method of claim 2, wherein, After the step of determining that the target bolt point to be tested has a torque decay risk, the method further comprises: judging whether the target axle force decay value is greater than a second axle force decay threshold value, the second axle force decay threshold value being greater than the first axle force decay threshold value; if yes, it is determined that the bolt fastener at the target bolt point to be tested needs to be replaced; if no, the step of obtaining the real-time driving mileage of the target vehicle under the current operating condition is re-executed.

4. The torque decay diagnostic method of claim 2, wherein, The target axle force decay curve has a first mutation point and a second mutation point, and the curve slope between the first mutation point and the second mutation point is 0. After the step of determining the initial axle force corresponding to the initial driving mileage and the target axle force corresponding to the real-time driving mileage based on the target axle force decay curve, the method further comprises: when it is detected that the target axle force is located before the first mutation point on the target axle force decay curve, it is determined that the target bolt point to be tested does not have a torque decay risk; when it is detected that the target axle force is located between the first mutation point and the second mutation point on the target axle force decay curve, it is determined that the target bolt point to be tested has a torque decay risk; when it is detected that the target axle force is located after the second mutation point on the target axle force decay curve, it is determined that the bolt fastener at the target bolt point to be tested needs to be replaced.

5. The torque decay diagnostic method of claim 1, wherein, The torque decay diagnosis method further comprises: controlling a test vehicle to drive under different operating conditions; for each bolt point to be tested on the test vehicle, collecting an axle force based on an axle force bolt at the bolt point to be tested to obtain test axle forces corresponding to the bolt point to be tested at different driving mileages under different operating conditions, the axle force bolt being integrated with an axle force collection sensor and an axle force transmission medium; constructing an axle force decay curve of the bolt point to be tested under different operating conditions according to the test axle forces and the corresponding driving mileages.

6. The torque decay diagnostic method of claim 5 wherein, Before the step of controlling the test vehicle to drive under different operating conditions, the method further comprises: Determine all to-be-tested bolt positions based on a preset suspension hard point structure form; Arrange an axial force bolt on each to-be-tested bolt position.

7. The torque decay diagnostic method of claim 5 wherein, After the step of collecting axial forces based on the axial force bolts at the to-be-tested bolt positions to obtain test axial forces corresponding to the to-be-tested bolt positions at different driving mileages under different operating conditions, the method further comprises: For each to-be-tested bolt position, determine test torque attenuation results of the to-be-tested bolt position at different driving mileages under different operating conditions based on the test axial forces corresponding to the to-be-tested bolt position at different driving mileages under different operating conditions. When it is detected that the test torque attenuation result of the to-be-tested bolt position is a torque attenuation risk or the bolt fastener needs to be replaced, perform attenuation counting on the to-be-tested bolt position to obtain an attenuation statistical value; Determine the point inspection and optimization order of all to-be-tested bolt positions in descending order of the attenuation statistical value.

8. A torque decay diagnostic apparatus characterized by, The torque attenuation diagnosis device comprises: a data acquisition module configured to acquire a real-time driving mileage of a target vehicle under a current operating condition; a curve screening module configured to, for each target to-be-tested bolt position on the target vehicle, screen a target axial force attenuation curve corresponding to the target to-be-tested bolt position and the current operating condition from a preset axial force attenuation curve library, the axial force attenuation curve library comprising axial force attenuation curves corresponding to each to-be-tested bolt position under different operating conditions; an axial force determination module configured to determine an initial axial force corresponding to a starting driving mileage and a target axial force corresponding to the real-time driving mileage based on the target axial force attenuation curve; an attenuation diagnosis module configured to determine a torque attenuation result of the target to-be-tested bolt position according to the initial axial force and the target axial force.

9. A torque decay diagnostic apparatus characterized by, The torque attenuation diagnosis device comprises a processor, a memory, and a torque attenuation diagnosis program stored on the memory and executable by the processor, wherein the torque attenuation diagnosis program, when executed by the processor, implements the steps of the torque attenuation diagnosis method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a torque attenuation diagnosis program, wherein the torque attenuation diagnosis program, when executed by the processor, implements the steps of the torque attenuation diagnosis method according to any one of claims 1 to 7.

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