Gap measuring device and method for steering system

Abstract

The invention relates to a steering system gap measuring device and method. The steering system gap measuring device comprises a supporting ring, a connector, an angle measuring piece, a plurality of weight adjusting rods and a plurality of adjusting weights. The plurality of weight adjusting rods are arranged on the supporting ring, the plurality of weight adjusting rods and the supporting ring are arranged in the same plane, and the plurality of weight adjusting rods are symmetrically arranged about the axis of the supporting ring; the plurality of adjusting weights are detachably connected with the plurality of weight adjusting rods and are used for applying preset load torque to the plurality of weight adjusting rods; the supporting ring, the connector and the angle measuring piece are coaxially arranged, and the connector is used for being connected with a measured rotating piece; the angle measuring piece is used for measuring the rotation angle of the measured rotating piece under the preset load torque. The device can measure the gap in a product assembly state and can also measure the gap in a sub-assembly state, so that the detection time is saved, and the detection efficiency is improved; multiple groups of symmetrically arranged weight adjusting rods can be used for multiple times of measurement from different angles, so that the detection precision is improved.

Description

Technical Field

[0001] The present application relates to the technical field of steering system measurement, and in particular to a steering system clearance measurement device and a measurement method. Background Art

[0002] The steering system is the core component of the vehicle's lateral control, and its performance directly affects the vehicle's handling stability and driving experience. The steering system needs to provide accurate and stable operational feedback to ensure the driver's driving safety and comfort. However, as the vehicle is used for a longer time or errors accumulate during the manufacturing process, the mechanical clearance in the steering system may gradually increase, resulting in steering noise, poor feel, and reduced handling accuracy.

[0003] In order to better detect the internal clearance of the steering system, measuring devices came into being. However, the existing clearance measuring equipment is mostly used in assembly and testing departments, and needs to be disassembled into sub-assembly systems, that is, the components to be measured must be separated from the overall steering system before measurement, which is time-consuming and labor-intensive, and increases the complexity of subsequent recovery or reassembly. At the same time, disassembling the measured components may cause secondary damage or data errors during the measurement process, which ultimately affects the efficiency and accuracy of the clearance measurement. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a steering system clearance measurement device and a measurement method.

[0005] In a first aspect, an embodiment of the present application discloses a steering system clearance measuring device, including a support ring, a connector, an angle measuring member, a plurality of weight adjustment rods, and a plurality of adjustment weights;

[0006] A plurality of weight adjustment rods are arranged on the support ring, the plurality of weight adjustment rods and the support ring are arranged in the same plane, and are symmetrically arranged about the axis of the support ring; a plurality of adjustment weights are detachably connected to the plurality of weight adjustment rods, and are used to apply a preset load torque to the plurality of weight adjustment rods;

[0007] The support ring, the connector and the angle measuring piece are coaxially arranged. The connector is used to be connected to the rotating piece to be measured. The angle measuring piece is used to measure the rotation angle of the rotating piece to be measured under a preset load torque.

[0008] In some possible embodiments, multiple adjustment nuts are further included; and external threads are arranged on the outer sides of the multiple weight adjustment rods;

[0009] A plurality of adjusting nuts are threadedly connected with a plurality of weight adjusting rods.

[0010] In some possible embodiments, the external threads of the plurality of weight adjustment rods and the internal threads of the plurality of adjustment nuts have the same lead angle.

[0011] In some possible embodiments, the support ring includes a plug-in portion and a connecting portion that are coaxially arranged;

[0012] The plug-in part is provided with a plurality of plug-in holes along its own axis direction, the plurality of plug-in holes are symmetrically arranged about the axis of the plug-in part, and the plurality of weight adjustment rods are plugged into the plurality of plug-in holes; the connecting part is coaxially connected with the connecting head.

[0013] In some possible embodiments, the diameter of the connecting portion is smaller than the diameter of the plug-in portion; and the angle measuring member is disposed on the peripheral side of the connecting portion.

[0014] In some possible embodiments, a plurality of connection threaded holes are arranged on a surface of the connection portion facing the connection head along its own axis direction, a plurality of mounting holes and a plurality of mounting bolts are arranged on the connection head, and the plurality of mounting bolts pass through the plurality of mounting holes and are threadedly connected with the plurality of connection threaded holes;

[0015] A connecting pipe is also arranged on the surface of the connecting head away from the connecting part. The connecting pipe is provided with a locking notch. A locking bolt is arranged at the locking notch. The locking bolt is used to lock the locking notch to clamp the rotating part to be measured in the connecting pipe.

[0016] In some possible embodiments, a boss is provided on a surface of the connecting head facing the connecting portion, a connecting groove is provided on a surface of the connecting portion facing the connecting head, and an inner diameter of the connecting groove is the same as an outer diameter of the boss.

[0017] In some possible embodiments, a hook is disposed at the first end of the adjusting weight, and a connecting piece is disposed at the second end of the adjusting weight, and the connecting piece is used to be connected to the hook of another adjusting weight.

[0018] In a second aspect, an embodiment of the present application discloses a measurement method, which is applicable to any one of the above-mentioned steering system clearance measurement devices, and the method includes:

[0019] Connect the connector to the rotating part to be measured;

[0020] Determine the load torque and the load arm and load moment corresponding to the load torque according to the gap torque;

[0021] Use one of the weight adjustment rods as the current adjustment rod, and use the weight adjustment rod symmetrical to the current adjustment rod as the symmetrical adjustment rod. For each current adjustment rod and each symmetrical adjustment rod:

[0022] Place the current adjustment rod horizontally, and place the adjustment weight corresponding to the load moment at the position corresponding to the load arm on the current adjustment rod;

[0023] Set the reading of the angle measuring piece to zero and remove the adjustment weight corresponding to the load moment;

[0024] Place an adjustment weight corresponding to the load moment at a position corresponding to the load arm on the symmetrical adjustment rod to obtain current angle data;

[0025] According to each current angle data, the clearance data of the rotating part being measured is determined.

[0026] In some possible embodiments, before determining the load torque and the load lever arm and load moment corresponding to the load torque according to the gap torque, the following steps are included:

[0027] Using one of the weight adjustment rods as a measuring adjustment rod, placing the measuring adjustment rod horizontally, and placing the adjustment weight at a preset position of the measuring adjustment rod;

[0028] Set the angle measuring piece reading to zero and remove the adjustment weight;

[0029] Placing an adjustment weight at a preset position on a weight adjustment rod symmetrical to the measurement adjustment rod to obtain first angle data;

[0030] Repeat the steps: add the adjustment weight, and place the added adjustment weight at the preset position on the measuring adjustment rod, set the angle measuring piece reading to zero, remove the added adjustment weight, and place the added adjustment weight at the preset position on the weight adjustment rod symmetrical to the measuring adjustment rod to obtain the second angle data;

[0031] The clearance torque is determined according to the adjustment weight, the preset position, the first angle data and the plurality of second angle data; wherein the plurality of second angle data respectively correspond to the plurality of increased adjustment weights.

[0032] In some possible embodiments, determining the gap torque according to the adjustment weight, the preset position, the first angle data and the plurality of second angle data includes:

[0033] Determining a plurality of current load torques according to the preset position, the adjustment weight, and the plurality of added adjustment weights;

[0034] Determine a plurality of angle difference data according to the first angle data and a plurality of second angle data;

[0035] The clearance torque is determined according to the plurality of current load torques and the plurality of angle difference data.

[0036] In some possible embodiments, determining the clearance data of the rotating part under test according to each current angle data includes:

[0037] Perform Kalman filtering on each current angle data to obtain angle data after Kalman filtering;

[0038] The clearance data of the rotating part under test is determined based on the angle data after Kalman filtering.

[0039] The technical solution provided by the embodiment of the present application has the following technical effects:

[0040] The steering system clearance measuring device of the embodiment of the present application includes a support ring, a connecting head, an angle measuring part, multiple weight adjustment rods and multiple adjustment weights; the multiple weight adjustment rods are arranged on the support ring, the multiple weight adjustment rods and the support ring are arranged in the same plane, and are symmetrically arranged about the axis of the support ring; the multiple adjustment weights are detachably connected to the multiple weight adjustment rods, and are used to apply a preset load torque to the multiple weight adjustment rods; the support ring, the connecting head and the angle measuring part are coaxially arranged, and the connecting head is used to connect to the rotating part to be measured; the angle measuring part is used to measure the rotation angle of the rotating part to be measured under the preset load torque. In an embodiment of the present application, after the connector is coaxially connected to the output end of the rotating part to be measured, adjusting weights are installed at various positions on the weight adjustment rod, so that a preset load torque can be applied to the rotating part to be measured, and the clearance of the equipment is calculated according to the angle measured by the angle detection part. The steering system can be measured using this device without disassembling the steering system. The clearance can be measured in the product assembly state or in the sub-assembly state, thus saving detection time and improving detection efficiency. Multiple sets of symmetrically arranged weight adjustment rods can perform multiple measurements from different angles to improve detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 1 ;

[0043] Figure 2 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 2 ;

[0044] Figure 3 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 3 ;

[0045] Figure 4 This is a schematic diagram of a steering system clearance measurement method provided in an embodiment of the present application. Figure 1 ;

[0046] Figure 5 This is a schematic diagram of a steering system clearance measurement method provided in an embodiment of the present application. Figure 2 ;

[0047] Figure 6 It is a flow chart of a method for determining clearance torque provided in an embodiment of the present application.

[0048] Reference numerals:

[0049] 1. Support ring; 11. Plug-in portion; 12. Connecting portion; 13. Plug-in hole; 14. Connecting groove;

[0050] 2. Connector; 21. Mounting bolt; 22. Connecting pipe; 23. Locking bolt; 24. Boss;

[0051] 3. Angle measuring parts;

[0052] 4. Weight adjustment rod;

[0053] 5. Adjust the weight;

[0054] 6. Adjust the nut. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0056] It should be noted that the "one embodiment" or "embodiment" referred to in the specification of the embodiment of the present application refers to a specific feature, structure or characteristic that can be included in at least one implementation of the present application. It should be understood that in the specification and claims of the embodiment of the present application and the above-mentioned drawings, the orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, in the description of the present embodiment, unless otherwise specified, "plurality" means two or more. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system or product including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] It should be understood that when a device or component is referred to as "on ...", "adjacent to ...", "connected to" other devices or components, it can be directly on, adjacent to, connected to other devices or components, or there can be intervening devices or components. On the contrary, when a device or component is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" other devices or components, there is no intervening device or component. It should be understood that although the terms first, second, third, etc. can be used to describe various components, areas, layers and / or parts, these components, areas, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one component, area, layer or part from another component, area, layer or part. Therefore, without departing from the teachings of the present application, the first component, area, layer or part discussed below can be expressed as the second component, area, layer or part. And when the second component, area, layer or part is discussed, it does not mean that the present application necessarily has the first component, area, layer or part.

[0058] In order to make the purpose, technical solution and advantages disclosed in the embodiments of the present application more clearly understood, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and are not used to limit the embodiments of the present application.

[0059] An embodiment of the present application provides a steering system clearance measuring device. Figure 1 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 1 ,like Figure 1 As shown, the steering system clearance measuring device comprises a support ring 1 , a connecting head 2 , an angle measuring member 3 , a plurality of weight adjusting rods 4 and a plurality of adjusting weights 5 .

[0060] In an optional embodiment, a plurality of weight adjustment rods 4 are arranged on the support ring 1, and the plurality of weight adjustment rods 4 and the support ring 1 are arranged in the same plane and are arranged symmetrically about the axis of the support ring 1. A plurality of adjustment weights 5 are detachably connected to the plurality of weight adjustment rods 4, and are used to apply a preset load torque to the plurality of weight adjustment rods 4. The support ring 1, the connector 2 and the angle measuring member 3 are coaxially arranged, and the connector 2 is used to connect to the rotating member to be measured; the angle measuring member 3 is used to measure the rotation angle of the rotating member to be measured under the preset load torque.

[0061] Through the above-mentioned arrangement, after the connector 2 is coaxially connected to the output end of the rotating part to be measured, the adjusting weights 5 are installed at various positions on the weight adjusting rod 4, so that a preset load torque can be applied to the rotating part to be measured, and the clearance of the rotating part to be measured is calculated according to the angle measured by the angle detecting part. The steering system can be measured by using this device without disassembling the steering system. The clearance can be measured in the product assembly state or in the sub-assembly state, which saves detection time and improves detection efficiency. Multiple groups of symmetrically arranged weight adjusting rods 4 can perform multiple measurements from different angles to improve detection accuracy.

[0062] In some possible embodiments, the steering system clearance measuring device further includes a plurality of adjusting nuts 6 (not shown in the figure), and external threads are provided on the outer sides of the plurality of weight adjusting rods 4. The plurality of adjusting nuts 6 are threadedly connected with the plurality of weight adjusting rods 4. The adjusting nuts 6 are used to fix the adjusting weight 5 at a certain position, so that when the weight adjusting rod 4 rotates, the relative position of the weight adjusting rod 4 and the adjusting weight 5 will not change, and the force point of the weight adjusting rod 4 will not change.

[0063] When the adjusting weight 5 is installed at a certain position of the weight adjusting rod 4, two adjusting nuts 6 are used to clamp and fix the adjusting weight 5 in the middle.

[0064] In some possible embodiments, the external threads of the plurality of weight adjustment rods 4 and the internal threads of the plurality of adjustment nuts 6 have the same lead angle.

[0065] The lead angle is a geometric parameter used to describe the degree of inclination of the helix in a thread or helical transmission. In a helical transmission, the lead is the distance that the thread moves in the axial direction for each rotation of the thread, and the lead angle describes the "slope" of the helix. By setting the same lead angle, in actual measurement, the position of the adjustment weight 5 on the weight adjustment rod 4 can be calculated by adjusting the number of rotations of the nut 6, and the adjustment accuracy of the adjustment nut 6 can also be set by setting the size of the lead angle. For example, by reducing the lead angle, that is, increasing the ratio of the pitch of the thread to the diameter of the screw, the axial movement distance of the nut per rotation will be reduced, thereby achieving higher adjustment accuracy.

[0066] In the embodiment of the present application, the weight adjustment rod 4 can be made of high-rigidity, low-quality carbon fiber material, thereby reducing the influence of weight and deformation on load calculation.

[0067] In a possible embodiment, the plurality of adjustment weights 5 may be configured as weights of different weights (eg, 1 g, 5 g, 10 g, etc.).

[0068] In some possible embodiments, a hook is provided at the first end of the adjusting weight 5, and a connector is provided at the second end of the adjusting weight 5, and the connector is used to connect with the hooks of other adjusting weights 5. When the weight of the adjusting weight 5 needs to be increased, the hooks at the top and the connectors at the bottom of multiple adjusting weights 5 can be connected to achieve additional weights at a specific position of the weight adjusting rod 4, that is, in the same force arm state, and apply a preset load torque.

[0069] Figure 2 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 2 ,like Figure 2 As shown, in some possible embodiments, the support ring 1 includes a plug-in portion 11 and a connecting portion 12 that are coaxially arranged.

[0070] like Figure 1 As shown, the plug-in portion 11 is provided with a plurality of plug-in holes 13 along its own axial direction, and the plurality of plug-in holes 13 are symmetrically arranged about the axis of the plug-in portion 11, and a plurality of weight adjustment rods 4 are plugged into the plurality of plug-in holes 13, and the weight adjustment rods 4 and the plug-in holes 13 can be relatively fixed by welding, pressing, etc.; the connecting portion 12 is coaxially connected to the connecting head 2.

[0071] In the embodiment of the present application, eight plug-in holes 13 are provided on the plug-in portion 11, and eight weight adjustment rods 4 are also correspondingly provided, specifically four symmetrical groups, that is, a plug-in hole 13 and a weight adjustment rod 4 are provided every 45° in the circumferential direction of the plug-in portion 11.

[0072] In some possible embodiments, the support ring 1 is hollow, and the diameter of the connecting portion 12 is smaller than the diameter of the plug-in portion 11 ; the angle measuring member 3 is arranged on the peripheral side of the connecting portion 12 .

[0073] Specifically, the angle measuring member 3 is configured as an angle sensor. The angle sensor is designed in a ring resistor pattern. According to the different rotation angles, the resistance value obtained by the probe changes, thereby calculating the angle change.

[0074] like Figure 2 As shown, the inner wall of the angle sensor is tightly matched with the outer wall of the connecting part 12 of the support ring 1 and is relatively fixed. The outer ring of the angle sensor is connected to the power supply and signal connector. The signal connector can be connected to the display screen to display the measured angle data on the display screen. The angle sensor of the present application contains data processing, storage and logical operation capabilities. It can store the measured value of each time, and can also add and delete operations with an external device. For each measurement data, logical drawing functions can be performed, such as torque and angle curves.

[0075] In some possible embodiments, the surface of the connecting portion 12 facing the connecting head 2 is provided with a plurality of connecting threaded holes along its own axial direction, and the connecting head 2 is provided with a plurality of mounting holes and a plurality of mounting bolts 21, and the plurality of mounting bolts 21 pass through the plurality of mounting holes and are threadedly connected with the plurality of connecting threaded holes. The connecting head 2 is detachably connected to the support ring 1 through the plurality of mounting bolts 21, and when testing the gap of different devices, the connecting head 2 can be disassembled and replaced to adapt to different devices to be tested.

[0076] Figure 3 A schematic diagram of a steering system clearance measuring device provided in an embodiment of the present application Figure 3 ,like Figure 2-3 As shown, a connecting pipe 22 is further provided on the surface of the connector 2 away from the connecting portion 12, and the connecting pipe 22 is provided with a locking notch, and a locking bolt 23 is provided at the locking notch, and the locking bolt 23 is used to lock the locking notch to clamp the measured rotating part in the connecting pipe 22. When connecting the measured rotating part with the connector 2, the output end of the measured rotating part is inserted into the connecting pipe 22, and the locking bolt 23 is tightened, so that the diameter of the connecting pipe 22 becomes smaller and the measured rotating part in the connecting pipe 22 is clamped.

[0077] In some possible embodiments, a boss 24 is provided on the surface of the connector 2 facing the connecting portion 12 , and a connecting groove 14 is provided on the surface of the connecting portion 12 facing the connector 2 . The inner diameter of the connecting groove 14 is the same as the outer diameter of the boss 24 .

[0078] In the present application, a chamfer is also provided at the edge of the boss 24 to facilitate the insertion of the boss 24 of the connecting head 2 into the connecting groove 14 of the connecting part 12. The boss 24 and the connecting groove 14 cooperate and lock with each other, so as to realize the coaxial cooperation between the connecting head 2 and the support ring 1 and ensure the concentricity of the two after assembly.

[0079] The following describes a specific embodiment of a steering system clearance measurement method of the present application. Figure 4 This is a schematic diagram of a steering system clearance measurement method provided in an embodiment of the present application. Figure 1 , this specification provides method operation steps such as embodiments or flow charts, but based on routine or non-creative work, more or fewer operation steps may be included. The order of steps listed in the embodiments is only one way of executing the steps among many steps, and does not represent the only execution order. The embodiments of the present application disclose a measurement method, such as Figure 4 As shown, the method is applicable to the above-mentioned steering system clearance measuring device, and the method comprises:

[0080] S101: Connect the connector to the rotating part to be measured.

[0081] S102: Determine the load torque and the load arm and load moment corresponding to the load torque according to the clearance torque.

[0082] S103: Using one of the weight adjustment rods as the current adjustment rod, using the weight adjustment rod symmetrical to the current adjustment rod as the symmetrical adjustment rod, and for each current adjustment rod and each symmetrical adjustment rod:

[0083] S104: placing the current adjustment rod horizontally, and placing the adjustment weight corresponding to the load torque at the position corresponding to the load arm on the current adjustment rod.

[0084] S105: Set the reading of the angle measuring component to zero and remove the adjustment weight corresponding to the load torque.

[0085] S106: placing an adjustment weight corresponding to the load moment at a position corresponding to the load arm on the symmetrical adjustment rod to obtain current angle data.

[0086] S107: Determine the clearance data of the rotating part under test according to each current angle data.

[0087] The steering system can be measured by the above method without disassembling the steering system. The clearance can be measured in the assembled state or in the sub-assembly state, which saves detection time and improves detection efficiency. Multiple sets of symmetrically arranged weight adjustment rods can perform multiple measurements from different angles to improve detection accuracy.

[0088] Figure 5This is a schematic diagram of a steering system clearance measurement method provided in an embodiment of the present application. Figure 2 , the method may include:

[0089] S201: Connect the connector to the rotating part to be measured.

[0090] In the embodiment of the present application, the rotating part to be tested is an electric power steering system (EPS), which is a car steering system that uses an electric motor to provide power. By sensing the steering force demand of the driver, the power assist is adjusted in real time to provide the driver with a lighter and more accurate steering operation. First, select a connector that is compatible with the EPS to be tested, connect the output shaft of the EPS to the connector, and tighten the locking bolt.

[0091] Before or after step S201 , the angle measuring component needs to be connected to a power source and a display screen.

[0092] S202: Determine the load torque and the load arm and load moment corresponding to the load torque according to the clearance torque.

[0093] In a possible embodiment, the clearance torque refers to the minimum torque required to overcome the effect of the meshing clearance of the components in the mechanical system and cause the measured rotating part to start a slight rotation. In other words, applying the clearance torque to the output shaft of the measured EPS in this application can drive the measured EPS to rotate.

[0094] In a possible embodiment, the load torque refers to the torque that can actually be applied to the rotating part under test and is closest to the clearance torque. For example, the clearance torque is theoretically 1.29 N·m, but in practice the accuracy cannot reach the theoretical value. In fact, a load torque of 1.3 N·m can be applied to the rotating part under test.

[0095] Those skilled in the art know that according to the torque formula: torque = force × distance, the magnitude of the torque is determined by the weight of the adjustment weight and the distance between the adjustment weight and the center of the support ring. By hanging an adjustment weight of a predetermined weight at a certain position of the weight adjustment rod, a load torque of a preset magnitude can be applied to the weight adjustment rod and to the EPS under test to drive the EPS system to rotate.

[0096] S203: Using one of the weight adjustment rods as the current adjustment rod, using the weight adjustment rod symmetrical to the current adjustment rod as the symmetrical adjustment rod, and for each current adjustment rod and each symmetrical adjustment rod:

[0097] S204: placing the current adjustment rod horizontally, and placing the adjustment weight corresponding to the load torque at the position corresponding to the load arm on the current adjustment rod.

[0098] S205: Set the reading of the angle measuring component to zero and remove the adjustment weight corresponding to the load torque.

[0099] S206: placing an adjustment weight corresponding to the load moment at a position corresponding to the load arm on the symmetrical adjustment rod to obtain current angle data.

[0100] In an embodiment of the present application, the symmetrical adjusting rod is a weight adjusting rod that is 180° relative to the current adjusting rod, that is, one of the weight adjusting rods is used as the first current adjusting rod to be measured, recorded as the 0° position, and after the current adjusting rod is placed horizontally and a load torque is applied, the angle sensor is set to zero, and then after a load torque is applied to the symmetrical adjusting rod that is 180° relative, the reading of the angle sensor is read and recorded as the current angle data corresponding to the 0° position.

[0101] Then, the adjacent weight adjustment rod of the current adjustment rod is used as the second current adjustment rod for measurement, recorded as the 45° position. After the current adjustment rod is placed horizontally and the load torque is applied, the angle sensor is set to zero. After the load torque is applied to the symmetrical adjustment rod at 180° relative to the current angle, the reading of the angle sensor is read and recorded as the current angle data corresponding to the 45° position.

[0102] According to the above method, the current angle data corresponding to the subsequent 90° position and the current angle data corresponding to the 135° position are measured in sequence.

[0103] S207: Determine the clearance data of the rotating part under test according to each current angle data.

[0104] In some possible embodiments, determining the clearance data of the rotating part under test according to each current angle data specifically includes:

[0105] S217: Perform Kalman filtering on each current angle data to obtain angle data after Kalman filtering.

[0106] S227: Determine the clearance data of the rotating part under test according to the angle data after Kalman filtering.

[0107] Kalman filtering is a recursive optimal estimation algorithm that utilizes system state prediction and measurement updates to fuse theoretical model predictions and actual measurements at each moment, and weighs the uncertainty (noise level) of the two to arrive at the best estimate of the current state. It can fuse prediction models and measurements to minimize system errors and correct undesirable measurements, and is widely used in signal processing, control systems, navigation, financial data analysis and other fields.

[0108] In this application, Kalman filtering of each angle data can improve the accuracy and reliability of gap measurement, eliminate interference caused by measurement noise or system errors, and update the estimated value in real time with each new measurement without storing a large amount of historical data, which is suitable for real-time measurement and analysis scenarios.

[0109] In some possible embodiments, before determining the load torque and the load lever arm and load moment corresponding to the load torque according to the gap torque, it is also necessary to determine the magnitude of the gap torque. Figure 6 : is a flow chart of a method for determining clearance torque provided by an embodiment of the present application, and the method may include:

[0110] S301: using one of the weight adjustment rods as a measuring adjustment rod, placing the measuring adjustment rod horizontally, and placing an adjustment weight at a preset position of the measuring adjustment rod.

[0111] Before step S301, it is also necessary to select a connector that is compatible with the EPS to be measured, connect the output shaft of the EPS to the connector, tighten the locking bolts, and connect the angle measuring component to the power supply and the display screen.

[0112] S302: Set the angle measuring piece reading to zero and remove the adjustment weight.

[0113] S303: placing an adjustment weight at a preset position on a weight adjustment rod symmetrical to the measurement adjustment rod to obtain first angle data.

[0114] S304: Repeat steps: add adjustment weights, and place the added adjustment weights at a preset position on the measuring adjustment rod, set the angle measuring piece reading to zero, remove the added adjustment weights, and place the added adjustment weights at a preset position on a weight adjustment rod symmetrical to the measuring adjustment rod to obtain second angle data.

[0115] In an embodiment of the present application, a weight adjustment rod is used as a measuring adjustment rod. After the measuring adjustment rod is placed horizontally and an adjustment weight of a first weight is hung at a preset position, the angle sensor is set to zero. Then, after an adjustment weight of a first weight is hung at a preset position relative to the weight adjustment rod at 180°, the reading of the angle sensor is read and recorded as the first second angle data.

[0116] After hanging an adjustment weight of a second weight (the second weight is greater than the first weight) at a preset position of the weight adjustment rod relative to 180°, the reading of the angle sensor is read and recorded as the first second angle data.

[0117] According to the above method, step S304 is repeated multiple times, and the weight of the adjustment weight is continuously increased, so that multiple second angle data can be obtained.

[0118] Through the above steps, starting from the lighter weight, gradually accumulating, a plurality of second angle data are obtained. The weight of the weight added each time can also be adjusted according to the accuracy requirement. For example, if the accuracy requirement is not high, the weight of the weight can be increased by 5g each time. If the accuracy requirement is high, the weight of the weight can be increased by 1g each time.

[0119] S305: Determine the gap torque according to the adjustment weight, the preset position, the first angle data and a plurality of second angle data; wherein the plurality of second angle data respectively correspond to a plurality of added adjustment weights.

[0120] In one possible embodiment, since the purpose is to determine the clearance torque, that is, the minimum torque required to make the rotating part under test start to rotate slightly, it is possible to observe when the EPS under test starts to rotate, and use the load torque applied to the steering system clearance measuring device at this time as the clearance torque of the EPS under test.

[0121] However, due to the large error of naked eye observation, in order to ensure the measurement accuracy of the steering system clearance measurement method of the present application, in some possible embodiments, the clearance torque is determined according to the adjustment weight, the preset position, the first angle data and the plurality of second angle data, including:

[0122] S315: Determine a plurality of current load torques according to the preset position, the adjustment weight, and the plurality of added adjustment weights.

[0123] By multiplying the distance from the preset position to the center position by the mass of the adjustment weight and the mass of the plurality of added adjustment weights, a plurality of current load torques can be obtained.

[0124] S325: Determine a plurality of angle difference data according to the first angle data and a plurality of second angle data.

[0125] A plurality of angle difference data can be obtained by subtracting the first angle data obtained in each detection from adjacent data of a plurality of second angle data.

[0126] S335: Determine the clearance torque according to the multiple current load torques and the multiple angle difference data.

[0127] A plane rectangular coordinate system is established with angle as the X-axis and torque as the Y-axis. Multiple angle difference data and multiple current load torques are marked in the rectangular coordinate system and connected into a curve. When the curve turns, that is, the slope changes suddenly, the X-axis reading corresponding to the turning point is used as the clearance torque of the EPS being tested.

[0128] After step S305, the clearance torque obtained above is used to perform steps S202 to S207 to obtain the clearance value.

[0129] It can be seen from the steering system clearance measurement method provided by the above-mentioned application that regardless of whether the clearance torque of the rotating part to be measured is known, the clearance data can be measured by the above-mentioned method. At the same time, regardless of whether the rotating part to be measured is disassembled or assembled, the clearance data can be measured by the above-mentioned method in the product assembly state or in the sub-assembly state. It is applicable to a wide range of scenarios, saves detection time, and improves detection efficiency. Multiple groups of symmetrically arranged weight adjustment rods can perform multiple measurements from different angles, and perform Kalman filtering to improve detection accuracy and optimize detection results.

[0130] It should be noted that the above-mentioned sequence of the embodiments of the present application is for description only and does not represent the advantages and disadvantages of the embodiments. The above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0131] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0132] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0133] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A steering system clearance measuring device, characterized in that: It comprises a support ring (1), a connecting head (2), an angle measuring member (3), a plurality of weight adjustment rods (4) and a plurality of adjustment weights (5); The plurality of weight adjustment rods (4) are arranged on the support ring (1), the plurality of weight adjustment rods (4) and the support ring (1) are arranged in the same plane, and are symmetrically arranged about the axis of the support ring (1); the plurality of adjustment weights (5) are detachably connected to the plurality of weight adjustment rods (4) and are used to apply a preset load torque to the plurality of weight adjustment rods (4); The support ring (1), the connecting head (2) and the angle measuring member (3) are coaxially arranged; the connecting head (2) is used to be connected to a rotating member to be measured; and the angle measuring member (3) is used to measure the rotation angle of the rotating member to be measured under the preset load torque.

2. The steering system clearance measuring device according to claim 1, characterized in that: It also includes a plurality of adjusting nuts (6); the outer surfaces of the plurality of weight adjusting rods (4) are all provided with external threads; The plurality of adjusting nuts (6) are threadedly connected to the plurality of weight adjusting rods (4).

3. The steering system clearance measuring device according to claim 2, characterized in that: The external threads of the plurality of weight adjustment rods (4) and the internal threads of the plurality of adjustment nuts (6) have the same lead angle.

4. The steering system clearance measuring device according to claim 1, characterized in that: The support ring (1) comprises a plug-in portion (11) and a connecting portion (12) which are coaxially arranged; The plug-in portion (11) is provided with a plurality of plug-in holes (13) along its own axial direction, the plurality of plug-in holes (13) are symmetrically arranged about the axis of the plug-in portion (11), and the plurality of weight adjustment rods (4) are plugged into the plurality of plug-in holes (13); the connecting portion (12) is coaxially connected to the connecting head (2).

5. The steering system clearance measuring device according to claim 4, characterized in that: The diameter of the connecting portion (12) is smaller than the diameter of the plug-in portion (11); and the angle measuring member (3) is arranged on the peripheral side of the connecting portion (12).

6. The steering system clearance measuring device according to claim 4, characterized in that: The connecting portion (12) is provided with a plurality of connecting threaded holes on a surface facing the connecting head (2) along its own axial direction, and the connecting head (2) is provided with a plurality of mounting holes and a plurality of mounting bolts (21), and the plurality of mounting bolts (21) pass through the plurality of mounting holes and are threadedly connected to the plurality of connecting threaded holes; A connecting pipe (22) is also provided on the surface of the connecting head (2) away from the connecting portion (12); the connecting pipe (22) is provided with a locking notch; a locking bolt (23) is provided at the locking notch; the locking bolt (23) is used to lock the locking notch to clamp the rotating part to be measured in the connecting pipe (22).

7. The steering system clearance measuring device according to claim 6, characterized in that: A boss (24) is provided on the surface of the connecting head (2) facing the connecting portion (12), and a connecting groove (14) is provided on the surface of the connecting portion (12) facing the connecting head (2); the inner diameter of the connecting groove (14) is the same as the outer diameter of the boss (24).

8. The steering system clearance measuring device according to claim 1, characterized in that: A hook is provided at the first end of the adjusting weight (5), and a connecting piece is provided at the second end of the adjusting weight (5), wherein the connecting piece is used to be connected to the hook of another adjusting weight (5).

9. A method for measuring clearance of a steering system, characterized in that: Applicable to the steering system clearance measuring device according to any one of claims 1 to 8, the method comprising: Connecting the connector to the rotating part to be measured; Determine the load torque and the load arm and load moment corresponding to the load torque according to the gap torque; One of the weight adjustment rods is used as the current adjustment rod, and the weight adjustment rod symmetrical to the current adjustment rod is used as the symmetrical adjustment rod. For each of the current adjustment rods and each of the symmetrical adjustment rods: The current adjustment rod is placed horizontally, and the adjustment weight corresponding to the load moment is placed at a position corresponding to the load arm on the current adjustment rod; Setting the reading of the angle measuring member to zero, and removing the adjustment weight corresponding to the load moment; Placing the adjustment weight corresponding to the load moment at the position corresponding to the load arm on the symmetrical adjustment rod to obtain current angle data; According to each current angle data, the clearance data of the detected rotating part is determined.

10. The steering system clearance measurement method according to claim 9, characterized in that: Before determining the load torque and the load arm and load moment corresponding to the load torque according to the clearance torque, the method includes: Using one of the weight adjustment rods as a measuring adjustment rod, placing the measuring adjustment rod horizontally, and placing the adjustment weight at a preset position of the measuring adjustment rod; Set the reading of the angle measuring piece to zero and remove the adjustment weight; Placing the adjustment weight at the preset position on the weight adjustment rod symmetrical to the measurement adjustment rod to obtain first angle data; Repeat the steps of: adding the adjustment weight, and placing the added adjustment weight at the preset position on the measuring adjustment rod, setting the angle measurement reading to zero, removing the added adjustment weight, and placing the added adjustment weight at the preset position on the weight adjustment rod symmetrical to the measuring adjustment rod, and obtaining second angle data; The clearance torque is determined according to the adjustment weight, the preset position, the first angle data and a plurality of the second angle data; wherein the plurality of the second angle data respectively correspond to a plurality of the added adjustment weights.

11. The steering system clearance measurement method according to claim 10, characterized in that: The step of determining the gap torque according to the adjustment weight, the preset position, the first angle data and a plurality of the second angle data comprises: Determining a plurality of current load torques according to the preset position, the adjustment weight, and the plurality of added adjustment weights; Determine a plurality of angle difference data according to the first angle data and a plurality of the second angle data; The gap torque is determined according to the plurality of current load torques and the plurality of angle difference data.

12. The steering system clearance measurement method according to claim 9, characterized in that: Determining the clearance data of the measured rotating part according to each current angle data includes: Perform Kalman filtering on each of the current angle data to obtain angle data after Kalman filtering; The clearance data of the measured rotating part is determined according to the angle data after the Kalman filter.

Images