Vehicle testing device

Abstract

The present invention solves the technical problem of obtaining a vehicle testing device such as a chassis dynamometer, which can automatically perform position setting of a roller rotation mechanism to prevent occurrence of tire position deviation phenomenon when a running test is performed. A control unit (80) receives detected speeds V1 and V2 obtained from rotation detectors (81 and 82), controls the roller rotation mechanism (3), a position changing mechanism (MV), and a front roller (20F), and performs a rotation center setting process. The rotation center setting process calculates a plurality of determination speed differences corresponding to a plurality of setting positions, i.e., a speed difference sum SMV, a maximum speed difference MXV, and the like, based on speed differences ΔV1 of the respective setting positions in step S6, and determines a setting position corresponding to a determination speed difference that is the minimum value among the plurality of determination speed differences as an optimal setting position. Then, in step S7 of the rotation center setting process, the roller rotation mechanism (3) is moved to the optimal setting position determined in step S6.

Description

Technical Field

[0001] This disclosure relates to vehicle testing apparatus such as a chassis dynamo meter used in various driving tests of vehicles. Background Technology

[0002] Chassis dynamometers, as one of the vehicle testing devices, have traditionally been used for driving tests of vehicles (automobiles), and include a roller assembly as a main component. Furthermore, chassis dynamometers have a vehicle securing mechanism for fixing the vehicle, which is positioned on the roller assembly, during driving tests. A conventional chassis dynamometer is, for example, the one disclosed in Patent Document 1.

[0003] To conduct various driving tests accompanying vehicle steering operations, a roller rotation operation is required to adapt the rollers to the tire rotation. That is, a roller rotation operation is needed to achieve a control method that makes the roller device used for the left and right tires follow the tire rotation angle caused by steering operations. This control method can be applied to autonomous driving and ADAS simulated driving tests. Furthermore, "ADAS (Advanced Driver Assistance System)" refers to a system that detects potential accidents in advance and takes avoidance measures.

[0004] In order to perform various driving tests as described above, which involve vehicle steering operations, conventional chassis dynamometers also include a roller rotation mechanism for performing roller rotation. The chassis dynamometer disclosed in Patent Document 1 above includes a roller rotation mechanism.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-203869 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The driving test, conducted using a conventional chassis dynamometer, involves mounting and fixing the vehicle's tires on the rollers of a roller assembly. The tire's rotation center is affected by factors such as the vehicle's kingpin position, kingpin inclination angle, and camber angle, and may differ from the center of the tire's contact surface, depending on the vehicle type.

[0010] Therefore, there is a considerable possibility that a positional deviation will occur between the rotation center of the roller and the rotation center of the tire at the start of the driving test. Hereinafter, the positional deviation between the rotation center of the roller and the rotation center of the tire will sometimes be referred to as the "positional deviation between rotation centers".

[0011] Figure 26 This is an explanatory diagram illustrating the problems with previous chassis dynamometers. Figure 26 This indicates a roller assembly with a double-roller structure of 20 roller pairs.

[0012] exist Figure 26 In this configuration, the front roller 20F is used as the load roller, and the rear roller 20R is used as the free roller. Therefore, the tire rotation direction K2F of the front roller 20F is opposite to the tire rotation direction K6 of the tire 6, and the tire rotation direction K6 of the tire 6 is opposite to the tire rotation direction K2R of the rear roller 20R.

[0013] Figure 26 (a) and Figure 26 (b) is a top view and a side view showing the positional relationship between roller pairs 20 (20F, 20B) and tire 6 when the vehicle is moving in a straight line (initial state). Figure 26 (c) and Figure 26 (d) is a top view and a side view showing the positional relationship between the roller pair 20 and the tire 6 when the vehicle's tire 6 and roller pair 20 are rotated. Figure 26 (a)~ Figure 26 Each of (d) describes an orthogonal XYZ coordinate system.

[0014] In addition, by Figure 26 (c) Figure 26 (d) represents the X-axis and Y-axis for easy comparison with... Figure 26 of (a), Figure 26 For the comparison of (b), let's temporarily make Figure 26 of (a), Figure 26 (b) has the X and Y axes aligned. In reality, the relationship between the tire 6 or roller pair 20 and the X and Y axes changes as the rollers and tires rotate.

[0015] In the Figure 26 In the illustrated dual-roller structure, the roller rotation mechanism (not shown) is capable of performing a roller rotation operation that rotates the roller pair 20 around the roller rotation center C2 along the roller rotation direction R2. On the other hand, the vehicle 60 is capable of performing a tire rotation operation as described above.

[0016] In addition, bed 65 is a base for mounting roller pair 20, and roller bearings 66 and 67 are components required for the rotation drive of the front roller 20F and rear roller 20R of roller pair 20.

[0017] The following is for reference Figure 26 The problems with the roller assembly 2 having roller pairs 20 will be explained. For example... Figure 26 As shown, the roller pair 20 is a double-roller structure with a front roller 20F at the front and a rear roller 20R at the rear. The diameters of the front roller 20F and the rear roller 20R are set to be smaller than the diameter of the tire 6.

[0018] like Figure 26 of (a), Figure 26 As shown in (b), in the initial state where the tire 6 is placed on the roller pair 20, the roller rotation center C2 is offset to the rear and right relative to the tire rotation center C6. That is, the roller rotation center C2 and the tire rotation center C6 have a deviation of DX2 in the X direction and a deviation of DY2 in the Y direction. Thus, in the initial state, there is a positional deviation between the rotation centers caused by the deviations DX2 and DY2.

[0019] like Figure 26 of (a), Figure 26 As shown in (b), when the vehicle 60 is moving in a straight line, it is not affected by the aforementioned positional deviation between the rotation centers and will not change from the initial state.

[0020] However, as Figure 26 (c) Figure 26 As shown in (d), if the tire rotation action and the roller rotation action are performed, even if the operation is performed in a way that matches the rotation angles of the tire 6 and the roller pair 20, the positional relationship between the roller pair 20 and the tire 6 will change significantly.

[0021] According to Figure 26 of (a), Figure 26 A comparison of the tire contact patch 6G (represented by (c)) shows a deviation of ΔX12 in the X direction. Furthermore, based on... Figure 26 (c) Figure 26 A comparison of the tire contact patch 6G (represented by (d)) shows a deviation of ΔY12 in the Y direction. Additionally, in... Figure 26 (c) represents the initial position of the tire contact surface P6G. Furthermore, according to... Figure 26 (b) Figure 26 By comparing the uppermost part 6T of tire 6 represented by (d), it can be seen that a deviation of ΔZ12 occurred in the Z direction.

[0022] Thus, if a driving test is conducted on vehicle 60 accompanied by tire rotation and roller rotation, a tire position deviation occurs in the direction that the tire rotation center C6 approaches the roller rotation center C2. In particular, if the roller pairs 20 are made smaller in order to achieve a larger rotation angle of tire 6 and reduce the interference between the left and right roller devices 2 and the interference between roller pairs 20, vehicle 60 will move up and down, and the height of vehicle 60 will easily change.

[0023] The conventional chassis dynamometer is configured as described above. When the tire 6 of the vehicle 60 is placed on the roller pair 20 of the roller device 2, there may be a positional deviation between the rotation center C6 and the rotation center C2 of the tire.

[0024] One of the reasons for the positional deviation between the rotation centers can be attributed to the fact that, based on the installation state of the tires 6 of the vehicle 60 (toe angle, kingpin inclination angle, front wheel camber angle, kingpin position, etc.), the contact position between the roller pair 20 and the tires 6 deviates from the desired contact position.

[0025] When a positional deviation occurs between the rotation centers, if a conventional chassis dynamometer is used to perform a driving test on the vehicle 60, which involves the rotation of the tires and the rotation of the rollers, the aforementioned tire positional deviation phenomenon occurs.

[0026] Due to tire position deviation, the contact position between tire 6 and roller pair 20 will deviate, causing lateral slippage of tire 6 on roller pair 20, resulting in vehicle 60 wobbling. Furthermore, such as... Figure 26 As shown in (d), the rear roller 20R of the front roller 20F and the rear roller 20R no longer contacts the tire 6.

[0027] If a vehicle 60 is tested on a chassis dynamometer 1 under such a tire position deviation condition, the tire 6 cannot be subjected to a normal load due to the change in the contact state between the tire 6 and the roller pair 20, or it may cause the vehicle 60 to shake, which will also affect the image of the camera mounted on the vehicle 60.

[0028] Thus, in conventional vehicle testing equipment, such as chassis dynamometers, the occurrence of tire position deviation, which is accompanied by positional deviation between rotation centers, results in the inability to perform accurate vehicle driving tests that involve tire rotation and roller rotation.

[0029] Typically, the tire rotation center C6 of vehicle 60 differs from the tread value recorded in the vehicle 60's product manual or other documentation, leading to frequent instances where the correct numerical information cannot be identified. In such cases, manual verification of the tire rotation center C6 is necessary, but this process is time-consuming.

[0030] Furthermore, the operation of aligning the roller rotation mechanism with the tire rotation center C6 and the roller rotation center C2 is a manual operation performed while simultaneously rotating the roller assembly 2 and confirming the floatation of the tire 6. This operation requires skill from the operator and involves a significant amount of work and time, making it a challenging task.

[0031] The present invention was made to solve the above-mentioned problems, and the purpose is to provide a vehicle testing device such as a chassis dynamometer that can automatically set the position of the roller rotation mechanism so that tire position deviation does not occur during driving tests.

[0032] Methods used to solve problems

[0033] The vehicle testing apparatus of the present invention is a vehicle testing apparatus comprising a roller assembly and a control unit. The roller assembly includes: a first roller and a second roller, on which a vehicle tire is mounted; a roller drive mechanism, which performs a roller drive operation to rotate the first roller; a first rotation detector, which detects the rotational speed of the first roller to obtain a first detection speed; a second rotation detector, which detects the rotational speed of the second roller to obtain a second detection speed; a roller rotation mechanism, which performs a roller rotation operation to rotate the first roller and the second roller; and a position changing mechanism, which performs a position change operation relative to the roller assembly mounted on the first roller and the second roller. The system handles position changes related to the tire's rotation center position; the first roller is used as a self-rotating load roller, and the second roller is used as a free roller that rotates in conjunction with the tire's rotation; the control unit receives the first and second detected speeds and controls the roller drive mechanism, the roller rotation mechanism, and the position change mechanism to perform the roller drive action, the roller rotation action, and the position change process; multiple preset positions are prepared for the roller rotation mechanism relative to the tire's rotation center; the control unit sets the roller rotation mechanism to one of the multiple preset positions. The initial setting position is included in the setting position, and the tires of the vehicle are configured and fixed on the first and second rollers. A rotation center setting process is then performed. This rotation center setting process includes: (a) performing the roller rotation operation and the roller drive operation, rotating the first roller while setting the first and second rollers to a predetermined rotation direction to perform a hypothetical driving test of the vehicle, and obtaining the first detection speed and the second detection speed; (b) performing the position change process, changing the position of the roller rotation mechanism to a new position included in the plurality of setting positions. The steps are as follows: (c) repeatedly performing steps (a) and (b) until step (a) has been performed at all of the multiple set positions; (d) calculating multiple determination speed differences corresponding to the multiple set positions based on the detection speed difference between the first detection speed and the second detection speed at each of the multiple set positions, and determining the set position corresponding to the minimum determination speed difference among the multiple determination speed differences as the optimal set position; and (e) performing the position change process to move the roller rotation mechanism to the optimal set position.

[0034] Invention Effects

[0035] In the vehicle testing apparatus disclosed herein, the control unit can automatically configure the roller rotation mechanism to the optimal setting position corresponding to the minimum value of the multiple determination speed differences by performing the above-described rotation center setting process.

[0036] Therefore, the vehicle testing apparatus disclosed herein can automatically set the position of the roller rotation mechanism to achieve the closest positional relationship between the tire rotation center and the roller rotation centers of the first and second rollers, ideally with the tire rotation center and the roller rotation center being aligned.

[0037] As a result, the vehicle testing apparatus of this disclosure can perform various driving tests on vehicles with good accuracy without producing tire position deviation during driving tests. Attached Figure Description

[0038] Figure 1 This is a perspective view of the chassis dynamometer of Embodiment 1, schematically showing the structure after the vehicle is mounted.

[0039] Figure 2 This is a front view showing the structure of the roller device used in the chassis dynamometer of Embodiment 1.

[0040] Figure 3 Viewed from above Figure 2 Top view of section A-A.

[0041] Figure 4 Viewed from above Figure 2 Top view of section B-B.

[0042] Figure 5 Viewed from above Figure 2 Top view of the C-C section.

[0043] Figure 6 Viewed from above Figure 2 Top view of the D-D section.

[0044] Figure 7 This is an explanatory diagram schematically showing the planar configuration of the roller pairs.

[0045] Figure 8 This is an explanatory diagram schematically showing the side configuration of the roller assembly.

[0046] Figure 9 It is a schematic representation Figure 7 An explanatory diagram of the cross-sectional structure of the E-E section.

[0047] Figure 10 It is a schematic representation Figure 7 An explanatory diagram of the cross-sectional structure of the F-F section.

[0048] Figure 11 This is an explanatory diagram schematically showing the control system of the roller assembly.

[0049] Figure 12 This is a flowchart illustrating the processing steps of the movement method of the roller rotation mechanism of the chassis dynamometer using this embodiment.

[0050] Figure 13 It means in Figure 12 The flowchart shows the processing steps for the acceleration and deceleration of the bearing roller.

[0051] Figure 14 It means in Figure 12 The flowchart in the middle represents the processing content of the location change process.

[0052] Figure 15 It means in Figure 14 The flowchart in the middle represents the processing content of the location change process.

[0053] Figure 16 It means in Figure 15 The diagram in the middle illustrates the execution of the left and right movement routine.

[0054] Figure 17 This is an explanatory diagram (Figure 1) showing the state of the roller device in an implementation of the left-right movement routine.

[0055] Figure 18 This is an explanatory diagram (Figure 2) showing the state of the roller device during the execution of the left-right movement routine.

[0056] Figure 19 It means in Figure 15 The diagram below illustrates the execution of the forward and backward movement routine.

[0057] Figure 20 This is an explanatory diagram (Figure 1) showing the state of the roller device in an implementation of the forward and backward movement routine.

[0058] Figure 21 This is an explanatory diagram (Figure 2) showing the state of the roller device during the execution of the forward and backward movement routine.

[0059] Figure 22 This is an example of an illustrative diagram that shows the coordinates of multiple set positions and processing steps of a roller rotary mechanism in tabular form.

[0060] Figure 23 It means in Figure 12 The flowchart shows the first processing step of the process for determining the optimal setting position.

[0061] Figure 24 It means in Figure 12 The flowchart shows the second processing step of the process for determining the optimal setting position.

[0062] Figure 25 This is an explanatory diagram showing the effect of the chassis dynamometer in the implementation method.

[0063] Figure 26 This is an explanatory diagram illustrating the problems with previous chassis dynamometers. Detailed Implementation

[0064] <Implementation Method>

[0065] (principle)

[0066] As by Figure 26 As indicated by (d), if the rear roller 20R, which is a free roller, no longer rotates, a large speed difference occurs between the rotational speed of the front roller 20F and the rotational speed of the rear roller 20R. Thus, the speed difference between the rotational speed of the front roller 20F and the rotational speed of the rear roller 20R becomes a useful criterion for determining the positional relationship between the roller rotation center C2 and the tire rotation center C6.

[0067] The vehicle testing apparatus of the present invention focuses on the speed difference between the rotational speed of the front roller 20F, which serves as a support roller, and the rotational speed of the rear roller 20R, which serves as a free roller.

[0068] (Overall structure)

[0069] Figure 1 This is a perspective view schematically showing the structure of the chassis dynamometer 1 after the vehicle 60 is mounted, relating to the implementation method. Additionally, in Figure 1 The figure represents the XYZ orthogonal coordinate system. In this embodiment, a chassis dynamometer 1 is used as a vehicle testing device.

[0070] like Figure 1 As shown, four tires 6 of a vehicle 60 are mounted on roller pairs 20 of four roller devices 2. Each roller device 2 has a roller pair 20 for mounting the tires 6 of the vehicle 60. Furthermore, the vehicle 60 is fixed in place on the roller pairs 20 of the four roller devices 2 by a vehicle fixing mechanism (not shown). At this time, the vehicle 60 is mounted in a left-right symmetrical manner with respect to the center line CL between the left and right roller devices 2, 2.

[0071] On the floor surface 50, in front of the vehicle 60 (in the +Y direction), a rectangular image simulator 62 is set with the X direction as the long side and the Z direction as the short side. As a simulation auxiliary component, the image simulator 62 has the function of displaying a panoramic view that can be visually recognized from the vehicle 60.

[0072] In addition, vehicle 60 may also have external sensors not shown. As external sensors, radar and lidar (LiDAR) used in corner sensors or side cameras (side electronic rearview mirrors) could be considered.

[0073] The chassis dynamometer 1 uses the angle information of the tires 6 of the vehicle 60 or the image simulator 62, etc., as needed, and receives information from the aforementioned external sensors of the vehicle 60 to conduct driving tests on the vehicle 60. The driving test includes a tire rotation action that accompanies the rotation of the tires 6 of the vehicle 60, and a roller rotation action that simultaneously rotates the roller pair 20.

[0074] (Roller device 2)

[0075] Figure 2 This is a front view showing the structure of the roller device 2 used in the chassis dynamometer 1 of this embodiment. Figure 2 The image shown is a frontal view viewed from the rear (-Y direction). Figure 2 The XYZ orthogonal coordinate system is described. When the two tires 6 on the front wheel side of the vehicle 60 perform a tire rotation action through a steering operation, it is used as at least two roller devices on the front wheel side. Figure 2 The roller device 2 is shown in the middle.

[0076] As shown in the figure, the roller device 2 is mounted on the base 25 and includes, as a main component, a forward and backward movement mechanism 5B, a left and right movement mechanism 4B, a roller rotation mechanism 3, a left and right movement mechanism 4T, a forward and backward movement mechanism 5T, and a roller drive mechanism 8.

[0077] The forward and backward movement mechanism 5B, which serves as the first forward and backward movement mechanism, is mounted on the base 25 and includes a drive motor 40, a track 51, a guide 55, and a moving carriage 30 as its main components. The moving carriage 30, which serves as the first forward and backward movement bed, can move along the track 51 in the Y direction, which is the forward and backward direction.

[0078] Figure 3 Viewed from above (+Z direction) Figure 2 The top view of section A-A. (e.g.) Figure 3 As shown, a pair of tracks 51 are arranged parallel to each other along the Y direction on the base 25. Multiple guide sections 55 are provided on each track 51. Figure 3 The text indicates two guidance units (55). For example... Figure 2 As shown, a moving trolley 30, which serves as a bed for moving in the first forward and backward direction, is fixed on the upper surface of each guide section 55.

[0079] like Figure 2 and Figure 3 As shown, a drive motor 40, serving as a first forward / backward direction motor, is mounted on the base 25. Furthermore, the drive motor 40 is a power source for rotating the rotating shaft 40a and moving the moving carriage 30. The rotating shaft 40a is rotatably supported by a pair of support bearings 40b.

[0080] Therefore, the first forward and backward movement process, in which the moving carriage 30 is moved in the Y direction by the drive motor 40, can be performed. At this time, the moving carriage 30 is guided by a pair of rails 51 and a plurality of guide parts 55 so that it moves correctly in the Y direction.

[0081] Linked to the movement of the mobile trolley 30, the left-right moving mechanism 4B, the roller rotation mechanism 3, the left-right moving mechanism 4T, the front-back moving mechanism 5T, and the roller drive mechanism 8 configured on the mobile trolley 30 move along the Y direction.

[0082] Therefore, by performing the first forward and backward movement process through the forward and backward movement mechanism 5B of the chassis dynamometer 1, the roller assembly 2 as a whole can be moved along the Y direction. Here, the Y direction is the same as the forward and backward direction of the vehicle 60 mounted on the roller assembly 2.

[0083] In this way, the forward and backward movement mechanism 5B performs a first forward and backward movement process that moves the roller rotation mechanism 3 and the roller pair 20 together in the forward and backward direction. In addition, the first forward and backward movement process performed by the forward and backward movement mechanism 5B is also used as a movement process for adjusting the wheelbase of the vehicle 60 to suit the test object.

[0084] A left-right moving mechanism 4B is provided on the moving trolley 30 of the forward and backward moving mechanism 5B. The left-right moving mechanism 4B, which is the first left-right moving mechanism, includes a drive motor 41, a track 52, a guide 56, and a moving bed 31 as its main components.

[0085] Figure 4 Viewed from above (+Z direction) Figure 2 The top view of section B-B. (e.g.) Figure 4 As shown, a pair of tracks 52 are arranged parallel to each other along the X direction on the mobile trolley 30. Multiple guide sections 56 are provided on each track 52. Figure 4 The text indicates two guidance units (56). For example... Figure 2 As shown, a movable bed 31, which serves as a first left-right moving bed, is fixed on the upper surface of each guide section 56.

[0086] like Figure 2 and Figure 4 As shown, a drive motor 41, serving as a first left-right direction motor, is installed on the moving trolley 30. The drive motor 41 is a power source that rotates the rotating shaft 41a and moves the moving bed 31. The rotating shaft 41a is rotatably supported by a pair of support bearings 41b.

[0087] Therefore, the left-right movement mechanism 4B, as the first left-right movement mechanism, can perform the first left-right movement process by moving the moving bed 31 in the X direction via the drive motor 41. At this time, the moving bed 31 is guided by a pair of tracks 52 and a plurality of guide parts 56 so that it moves correctly along the X direction.

[0088] The roller rotation mechanism 3, the left-right movement mechanism 4T, the front-back movement mechanism 5T, and the roller drive mechanism 8, which are mounted on the moving bed 31 as the first left-right movement bed, move along the X direction in conjunction with the movement of the moving bed 31.

[0089] Therefore, by causing the left-right movement mechanism 4B to perform the first left-right movement process, the chassis dynamometer 1 can move the component above the left-right movement mechanism 4B of the roller device 2 along the X direction (left-right direction).

[0090] When the left-right moving mechanism 4B performs the first left-right moving operation, the front-back moving mechanism 5B does not move in the left-right direction. This is because the front-back moving mechanism 5B is not linked to the movement of the moving bed 31.

[0091] In this way, the left-right movement mechanism 4B performs the first left-right movement process, which is caused by the drive motor 41, which is the first left-right movement motor, to move the moving bed 31, which is the first left-right movement bed, along the X direction.

[0092] Here, the X direction is the same as the left-right direction of the vehicle 60 on which the tire 6 is placed on the roller 10 of the roller device 2. Therefore, the left-right movement mechanism 4B performs a first left-right movement process that moves the roller rotation mechanism 3 and the roller pair 20 together in the left-right direction.

[0093] A roller rotation mechanism 3 is provided on the moving bed 31. The roller rotation mechanism 3 includes a rotary bed 32, a rotary motor 42 and a rotary bearing 38 as its main components.

[0094] The rotary motor 42 is a geared motor capable of speed control. A gear is mounted on the front end of the rotary motor 42, which meshes with a gear (not shown) mounted on the outer periphery of the rotary bed 32. Therefore, by rotating the rotary motor 42, the rotary bed 32 can be rotated.

[0095] The rotary bearing 38 rotatably supports the rotary bed 32, and the rotary bed 32 is rotated about the center of the rotary bearing 38 by the power of the rotary motor 42. Thus, the roller rotary mechanism 3 has a rotary bed 32 rotated by the rotary motor 42.

[0096] The rotary bed 32 of the roller rotary mechanism 3 rotates in conjunction with the rotation of the roller rotary mechanism 3. The left-right moving mechanism 4T, the front-back moving mechanism 5T and the roller drive mechanism 8, which are located above the roller rotary mechanism 3, rotate.

[0097] The center of the cavity of the slewing bearing 38 is the rotation center C2 of the roller pair 20. Therefore, the roller rotation mechanism 3 can perform the roller rotation action that rotates the roller pair 20.

[0098] A left-right movement mechanism 4T, serving as a second left-right movement mechanism, is provided on the rotary bed 32 of the roller rotation mechanism 3. The left-right movement mechanism 4T mainly includes a drive motor 43, a track 53, a guide 57, and a moving bed 33.

[0099] Figure 5 Viewed from above (+Z direction) Figure 2 A top view of the C-C section. (See example.) Figure 5 As shown, a pair of tracks 53 are arranged parallel to each other along the X direction on the rotary bed 32. Multiple guide sections 57 are provided on each track 53. Figure 5 The text indicates two guidance units (57). For example... Figure 2 As shown, a movable bed 33 serving as the first movable bed is fixed on the upper surface of each guide section 57.

[0100] like Figure 2 and Figure 5 As shown, a drive motor 43, serving as the first moving motor, is installed on the rotary bed 32. The drive motor 43 is a power source that rotates the rotating shaft 43a and moves the moving bed 33. The rotating shaft 43a is rotatably supported by a pair of support bearings 43b.

[0101] Therefore, the left-right movement mechanism 4T can perform a second left-right movement process, in which the moving bed 33 is moved in the X direction by the drive motor 43. At this time, the moving bed 33 is guided by a pair of tracks 53 and a plurality of guides 57 so that it moves correctly in the X direction.

[0102] In conjunction with the movement of the movable bed 33, the forward and backward movement mechanism 5T and the roller drive mechanism 8, which are configured on the movable bed 33, move along the X direction.

[0103] Therefore, by performing the second left-right movement process, the left-right movement mechanism 4T of the chassis dynamometer 1 can move the component of the roller device 2, which is located above the left-right movement mechanism 4B, along the X direction (left-right direction).

[0104] When the second left-right movement is performed by the left-right movement mechanism 4T, the roller rotation mechanism 3 located below the left-right movement mechanism 4T will not move in the left-right direction. This is because the roller rotation mechanism 3 is not linked to the movement of the moving bed 33.

[0105] In this way, the left-right movement mechanism 4T performs a second left-right movement process, which moves the moving bed 33, which serves as the second left-right movement bed, along the X direction via the drive motor 43, which is the second left-right movement motor. That is, the left-right movement mechanism 4T performs a second left-right movement process, which moves only the roller pair 20 along the left-right direction in the roller rotation mechanism 3 and the roller pair 20.

[0106] A forward and backward moving mechanism 5T, serving as the second forward and backward moving mechanism, is installed on the moving bed 33 of the left-right moving mechanism 4T. The forward and backward moving mechanism 5T mainly includes a drive motor 44, a track 54, a guide 58, and the moving bed 34.

[0107] Figure 6 Viewed from above (+Z direction) Figure 2 A top view of the D-D section. (e.g.) Figure 6 As shown, a pair of tracks 54 are arranged parallel to each other along the Y direction on the movable bed 33. Multiple guide sections 58 are provided on each track 54. Figure 6 The text indicates two guidance units (58). For example... Figure 2 As shown, a movable bed 34 serving as a second forward and backward moving bed is provided on the upper surface of each guide section 58.

[0108] like Figure 2 and Figure 6 As shown, a drive motor 44, serving as a second forward and backward motor, is installed on the movable bed 33. Furthermore, the drive motor 44 is the power source for rotating the rotary shaft 44a and moving the movable bed 34. The rotary shaft 44a is rotatably supported by a pair of support bearings 44b.

[0109] Therefore, a second forward and backward movement process can be performed, in which the moving bed 34 is moved in the Y direction by the drive motor 44. At this time, the moving bed 34 is guided by a pair of tracks 54 and a plurality of guides 58 so that it moves correctly along the Y direction.

[0110] In conjunction with the movement of the movable bed 34, the roller drive mechanism 8 mounted on the movable bed 34 moves along the Y direction.

[0111] Therefore, by performing the second forward and backward movement process, the forward and backward movement mechanism 5T of the chassis dynamometer 1 can make the roller pairs 20 of each roller device 2 move along the Y direction.

[0112] When the second forward / backward movement is performed by the forward / backward movement mechanism 5T, the roller rotation mechanism 3, which is located below the forward / backward movement mechanism 5T, will not move in the forward / backward direction. This is because the roller rotation mechanism 3 is not linked to the movement of the moving bed 34.

[0113] Thus, the forward and backward movement mechanism 5T, which is the second forward and backward movement mechanism, performs a second forward and backward movement process by moving the moving bed 34, which is the second forward and backward movement bed, in the Y direction via the drive motor 44, which is the second forward and backward movement motor. That is, the forward and backward movement mechanism 5T performs a second forward and backward movement process by moving only the roller pair 20 of the roller rotation mechanism 3 and the roller pair 20 in the forward and backward direction.

[0114] The combination of the left-right moving mechanisms 4B and 4T and the front-back moving mechanisms 5B and 5T described above constitutes the position changing mechanism MV. The position changing mechanism MV performs position changing processing to change the position of the roller rotation mechanism 3 relative to the tire rotation center C6 of the tire 6 mounted on the roller pair 20.

[0115] The left-right movement mechanism 4B performs a first left-right movement process that moves the roller pair 20 and the roller rotation mechanism 3 together in the left-right direction (X direction). The left-right movement mechanism 4T performs a first left-right movement process that moves only the roller pair 20 of the roller rotation mechanism 3 and the roller pair 20 in the left-right direction.

[0116] The forward and backward movement mechanism 5B performs a first forward and backward movement process, causing the roller pair 20 and the roller rotation mechanism 3 to move together in the forward and backward direction (Y direction). The forward and backward movement mechanism 5T performs a second left and right movement process, causing only the roller pair 20 of the roller rotation mechanism 3 and the roller pair 20 to move in the forward and backward direction (Y direction).

[0117] The position change processing performed by the position change mechanism MV is a combination of the first and second left-right direction movement processing and the first and second front-back direction movement processing described above.

[0118] A roller drive mechanism 8 with roller pairs 20 is mounted on a moving bed 34 of a forward and backward moving mechanism 5T.

[0119] The roller drive mechanism 8, corresponding to the double-roller structure, includes a DC generator 11, a coupling 15, a gearbox 26, roller bearings 27, a pair of rollers 20, and a rotating shaft 28 as its main components. Here, the rotating shafts 28 are a pair of rotating shafts 28, and the roller bearings 27 are a pair of roller bearings 27 corresponding to the pair of rotating shafts 28.

[0120] The DC generator 11 and gearbox 26 are fixed on the movable bed 34. The DC generator 11, which serves as the drive source, drives a pair of rotating shafts 28 to rotate via the coupling 15 and gearbox 26. Specifically, the gearbox 26 branches the rotational motion transmission function into two branches, enabling the rotational drive of a pair of rotating shafts 28.

[0121] A pair of roller bearings 27 are arranged on the movable bed 34 in a manner that crosses the DC generator 11. A pair of rotating shafts 28 rotatably support the roller pair 20 between the gearbox 26 and the pair of roller bearings 27.

[0122] By mounting a pair of rotating shafts 28 through the center of each roller pair 20, the roller pair 20 can rotate as the pair of rotating shafts 28 rotate.

[0123] Therefore, the roller drive mechanism 8 performs a roller drive operation that drives the front roller 20F, which serves as the first roller, to rotate. In addition, the roller drive mechanism 8 can also perform a roller drive operation that drives the rear roller 20R, which serves as the second roller, to rotate.

[0124] Alternatively, a double-roller structure can be formed by setting two roller drive mechanisms 8 with corresponding single-roller structures on the moving bed 34.

[0125] Figure 7 This is an explanatory diagram schematically showing the planar configuration of roller assembly 2L and roller assembly 2R. Figure 8 This is an explanatory diagram schematically showing the side configuration of the roller assembly 2R. Figure 9 It is a schematic representation Figure 7 An explanatory diagram of the cross-sectional structure of the E-E section. Figure 10 It is a schematic representation Figure 7 An explanatory diagram of the cross-sectional structure of the F-F section. In Figures 7-10 Each of them describes an XYZ orthogonal coordinate system.

[0126] The roller device 2 in this embodiment is a device for placing a pair of tires at the front or rear of the vehicle 60. The pair of tires includes a tire 6L as the left tire and a tire 6R as the right tire.

[0127] In this embodiment, the roller device 2 is a combination of a front roller 20F as the first roller and a rear roller 20R as the second roller, which is a roller pair 20.

[0128] like Figure 7 As shown, the roller device 2 includes a roller device 2L, which is provided as a left-hand roller device corresponding to the tire 6L of the vehicle 60, and a roller device 2R, which is provided as a right-hand roller device corresponding to the tire 6R of the vehicle 60.

[0129] Roller assembly 2L and roller assembly 2R are respectively capable of performing roller rotation operations by the roller rotation mechanism 3 described above, which causes the front roller 20F and the rear roller 20R to rotate along the roller rotation direction R2.

[0130] Roller units 2L and 2R each have a position changing mechanism MV. The position changing mechanisms MV of roller units 2L and 2R simultaneously perform position changing processing.

[0131] like Figure 7 and Figure 8 As shown, tires 6R (6L) are mounted on the front roller 20F and the rear roller 20R, respectively. Additionally, in Figure 7 and Figure 8 The diagram illustrates the relationship between the roller pairs 20, showing the front roller 20F and the rear roller 20R in contact. In reality, there is a small space between the front roller 20F and the rear roller 20R, and they do not actually contact each other.

[0132] like Figure 9 As shown, a rotation detector 81L is installed near the end of the rotating shaft 28 of the front roller 20F of the roller assembly 2L. The rotation detector 81L detects the rotational speed of the front roller 20F of the roller assembly 2L to obtain the detection speed V1L.

[0133] Similarly, a rotation detector 81R is provided near the end of the rotating shaft 28 of the front roller 20F of the roller assembly 2R. The rotation detector 81R detects the rotational speed of the front roller 20F of the roller assembly 2R to obtain the detection speed V1R.

[0134] In addition, since the front roller 20F is used as a carrier roller, the rotation detectors 81L and 81R can also be set on the DC generator 11 of the motor that serves as the power source for the front roller 20F.

[0135] The detection speed V1L obtained from the rotary detector 81L is the first detection speed used on the left, and the detection speed V1R obtained from the rotary detector 81R is the first detection speed used on the right.

[0136] Thus, the roller device 2, including roller devices 2L and 2R, serves as the first rotation detector and includes rotation detectors 81L and 81R, and the detection speeds V1L and V1R detected by the rotation detectors 81L and 81R are the first detection speeds.

[0137] Hereinafter, when referring to the rotary detectors 81L and 81R collectively, they will be simply referred to as "rotary detector 81", and when referring to the detection speeds V1L and V1R collectively, they will be simply referred to as "detection speed V1".

[0138] like Figure 10As shown, a rotation detector 82L is installed near the end of the rotating shaft 28 of the rear roller 20R of the roller assembly 2L. The rotation detector 82L detects the rotational speed of the rear roller 20R of the roller assembly 2L to obtain the detection speed V2L.

[0139] Similarly, a rotation detector 82R is installed near the end of the rotating shaft 28 of the rear roller 20R of the roller assembly 2R. The rotation detector 82R detects the rotational speed of the rear roller 20R of the roller assembly 2R to obtain the detection speed V2R.

[0140] The detection speed V2L obtained from the rotary detector 82L is the second detection speed used on the left, and the detection speed V2R obtained from the rotary detector 82R is the second detection speed used on the right.

[0141] Thus, the roller device 2, including roller devices 2L and 2R, serves as the second rotary detector and includes rotary detectors 82L and 82R. The detection speeds V2L and V2R detected by the rotary detectors 82L and 82R are the second detection speeds.

[0142] Hereinafter, when referring to the rotary detectors 82L and 82R collectively, they will be simply referred to as "rotary detector 82", and when referring to the detection speeds V2L and V2R collectively, they will be simply referred to as "detection speed V2".

[0143] Figure 11 This is an explanatory diagram schematically showing the control system of the roller assembly 2. The chassis dynamometer 1 of this embodiment includes the roller assembly 2 and a control unit 80 as key components. Figure 11 In the diagram, the roller rotation mechanism 3, the position change mechanism MV, the roller drive mechanism 8, and the rotation detectors 81 and 82 within the roller device 2 are represented in block form.

[0144] As shown in the figure, the control unit 80 receives the detection speeds V1 and V2 from the rotary detectors 81 and 82, and controls the roller rotation mechanism 3, the position change mechanism MV and the front roller 20F to perform roller rotation, position change and roller drive actions.

[0145] Specifically, the control unit 80 executes the roller rotation operation performed by the roller rotation mechanism 3 by giving a drive signal SD3 to the roller rotation mechanism 3, and executes the position change processing performed by the position change mechanism MV by giving a drive signal SDP to the position change mechanism MV.

[0146] Furthermore, the control unit 80 provides a drive signal SD8 to the roller drive mechanism 8, enabling the roller drive mechanism 8 to perform a roller drive action that rotates the front roller 20F.

[0147] In the roller assembly 2 of this embodiment, the front roller 20F is used as a load-bearing roller that is driven to rotate on its own. On the other hand, the rear roller 20R is used as a free roller that rotates in conjunction with the rotation of the contacting tire 6. Therefore, since the drive signal SD8 does not instruct the rear roller 20R to rotate, the control unit 80 disconnects the rear roller 20R from the DC generator 11.

[0148] Alternatively, the front roller 20F and the rear roller 20R can be used as a carrier roller or a free roller, respectively. A carrier roller is a roller that rotates on its own driven by a DC generator 11, which acts as a motor, while a free roller is a roller that is disconnected from the DC generator 11 and rotates with the rotation of the tire 6.

[0149] Thus, in the chassis dynamometer 1 of this embodiment, the front roller 20F is used as a load-bearing roller, and the rear roller 20R is used as a free roller.

[0150] (Movement method of roller rotation mechanism 3)

[0151] Figure 12 This is a flowchart illustrating the processing steps of the movement method of the roller rotation mechanism 3 of the chassis dynamometer 1 using the embodiment. Hereinafter, the processing content of the movement method of the roller rotation mechanism 3 will be described with reference to this diagram.

[0152] The following explanation assumes that the pair of tires 6 on the front wheel side of the vehicle 60 rotates by steering.

[0153] In addition, as described above, let the left side of the pair of tires 6 on the front wheel side of the vehicle 60 be tire 6L, and the right side be tire 6R. Let the roller device 2 for tire 6L be roller device 2L, and the roller device 2 for tire 6R be roller device 2R. Here, roller device 2L is a left-hand roller device, and roller device 2R is a right-hand roller device.

[0154] Furthermore, let the rotation center of tire 6L be the left tire rotation center C6L, the rotation center of tire 6R be the right tire rotation center C6R, the rotation center of roller pair 20 of roller device 2L be the left roller rotation center C2L, and the rotation center of roller pair 20 of roller device 2R be the right roller rotation center C2R.

[0155] Furthermore, when performing the movement method of the roller rotation mechanism 3, multiple preset positions are prepared in advance as candidate movement positions of the roller rotation mechanism 3.

[0156] Reference Figure 12 First, in step S1, the roller rotation center C2 of the roller rotation mechanism 3 is set to an initial setting position included in the above-mentioned multiple setting positions.

[0157] During the execution of step S1, since no vehicle 60 is configured on the roller devices 2L and 2R, the roller devices 2L and 2R, each including the roller rotation mechanism 3, can be manually moved to configure the roller rotation mechanism 3 to the initial set position. Alternatively, during the execution of step S1, the position changing mechanism MV can also perform position changing processing to set the roller rotation mechanism 3 to the initial set position.

[0158] Then, in step S2, the four tires 6 of the vehicle 60 are arranged on the four roller pairs 20. At least two of the four roller pairs 20 for the front wheels are respectively set by... Figures 2-6 Within the roller assembly 2, a portion of the upper part protrudes from the floor surface 50. Through the execution of step S2, the vehicle 60 is positioned in a manner symmetrical about left and right relative to the center line CL between the left and right roller assemblies 2L and 2R.

[0159] Furthermore, in step S2, the vehicle 60, configured on the four roller pairs 20, is fixed so that the rotation center setting process can be performed in step S3 and beyond. The fixing of the vehicle 60 on the roller pairs 20 is performed using an existing vehicle fixing mechanism.

[0160] Thus, through the execution of steps S1 and S2, the roller rotation mechanism 3 is set to an initial set position included in a plurality of set positions, and the tires 6 of the vehicle 60 are configured and fixed on the roller pair 20.

[0161] Below, two roller pairs 20 for the front wheel out of the four roller pairs 20 are set up by... Figures 2-6 The description is based on the premise that the roller device 2 is shown.

[0162] In subsequent steps S3 to S7, the rotation center setting process is performed under the control of the control unit 80.

[0163] First, in step S3, the load-bearing roller acceleration and deceleration process is executed by giving a drive signal SD3 to the roller rotation mechanism 3 from the control unit 80 and a drive signal SD8 to the roller drive mechanism 8 of the roller device 2 for the front wheel.

[0164] Here, drive signal SD3 is used to set the roller rotation mechanism 3 to a specified rotation direction, and drive signal SD8 is a signal that indicates the rotation drive of the front roller 20F but does not indicate the rotation drive of the rear roller 20R.

[0165] Therefore, in step S3, by executing the roller rotation action performed by the roller rotation mechanism 3 and the roller driving action performed by the roller driving mechanism 8, the roller pair 20 is set to the specified rotation direction, and a test environment is achieved in which the front roller 20F, which is the first roller, rotates in a way that accelerates or decelerates the rotation speed.

[0166] Furthermore, the acceleration and deceleration process of the bearing roller in step S3 is to perform a hypothetical driving test of the vehicle 60 under the above test environment and obtain the detection speeds V1 and V2 as the first and second detection speeds from the rotation detectors 81 and 82.

[0167] Thus, step S3 is as follows: execute the roller rotation action and roller drive action. With the roller pair 20 set to the specified rotation direction, rotate the front roller 20F by accelerating or decelerating the rotation speed to perform a hypothetical driving test of the vehicle 60 and obtain the detection speeds V1 and V2.

[0168] Figure 13 It means in Figure 12 The flowchart shows the processing content of step S3. As shown in the figure, step S3 includes steps S31 to S33.

[0169] Reference Figure 13 In step S31, acceleration and deceleration processing in the straight-line forward direction is performed. That is, step S31 is a step of performing a straight-line forward driving test of the vehicle 60 by rotating the front roller 20F in a manner that accelerates or decelerates the rotational speed while setting the roller pair 20 in the straight-line forward direction. During the execution of step S31, the detection speeds V1 and V2 obtained from the rotation detectors 81 and 82 are the detection speeds V11 and V21 when moving in a straight line.

[0170] Here, the detection speed V11 when moving in a straight line is the first detection speed when moving in a straight line, and the detection speed V21 when moving in a straight line is the second detection speed when moving in a straight line. In addition, the direction of straight-line movement is the same as the forward and backward direction of the vehicle 60.

[0171] Furthermore, the detection speeds V11 and V21 during straight-line forward movement are obtained from roller devices 2L and 2R, respectively. The detection speeds V11 and V21 during straight-line forward movement obtained from roller device 2L are the detection speeds V11L and V21L during straight-line forward movement, and the detection speeds V11 and V21 during straight-line forward movement obtained from roller device 2R are the detection speeds V11R and V21R during straight-line forward movement.

[0172] Next, in step S32, a left-turn acceleration / deceleration process is performed. That is, step S32 is a step of performing a left-turn driving test on the vehicle 60 by rotating the front roller 20F in a manner that accelerates or decelerates the rotational speed while setting the roller pair 20 to the left-turn direction. During the execution of step S32, the detection speeds V1 and V2 obtained from the rotation detectors 81 and 82 are the detection speeds V12 and V22 during the left-turn.

[0173] Here, the detection speed V12 during a left turn is the first detection speed during a left turn, and the detection speed V22 during a left turn is the second detection speed during a left turn. Additionally, the left turn direction is the direction from the straight-ahead direction to the left by a specified angle. Multiple angles can also be set for the left turn direction.

[0174] Furthermore, the detection speeds V12 and V22 during left turn are obtained from roller devices 2L and 2R respectively. The detection speeds V12 and V22 during left turn obtained from roller device 2L are the detection speeds V12L and V22L during left turn, and the detection speeds V12 and V22 during left turn obtained from roller device 2R are the detection speeds V12R and V22R during left turn.

[0175] Then, in step S33, a right-turn acceleration / deceleration process is performed. That is, step S33 is a step of performing a right-turn driving test of the vehicle 60 by rotating the front roller 20F in a manner that accelerates or decelerates the rotational speed while setting the roller pair 20 to the right-turn direction. During the execution of step S33, the detection speeds V1 and V2 obtained from the rotation detectors 81 and 82 are the detection speeds V13 and V23 during the right-turn.

[0176] Here, the detection speed V13 during a right turn is the first detection speed during a right turn, and the detection speed V23 during a right turn is the second detection speed during a right turn. Furthermore, the right turn direction is the direction from the straight-ahead direction to the right by a specified angle. Multiple angles can also be set for the right turn direction.

[0177] In addition, the right-hand rotation detection speeds V13 and V23 are obtained from the roller devices 2L and 2R respectively. The right-hand rotation detection speeds V13 and V23 obtained from the roller device 2L are the right-hand rotation detection speeds V13L and V23L, and the right-hand rotation detection speeds V13 and V23 obtained from the roller device 2R are the right-hand rotation detection speeds V13R and V23R.

[0178] Here, the detection speed V11L when moving forward in a straight line, V12L when turning left, and V13L when turning right are classified as the first detection speed for left turns, while the detection speed V11R when moving forward in a straight line, V12R when turning left, and V13R when turning right are classified as the first detection speed for right turns.

[0179] Similarly, the detection speed V21L when moving forward in a straight line, V22L when turning left, and V23L when turning right are classified as the second detection speed for left turns, while the detection speed V21R when moving forward in a straight line, V22R when turning left, and V23R when turning right are classified as the second detection speed for right turns.

[0180] In the Figure 13In steps S31 to S33, the aforementioned straight forward direction, left turn direction, and right turn direction are set as the prescribed turning directions. The straight forward driving test in step S31, the left turn driving test in step S32, and the right turn driving test in step S33 are performed as hypothetical driving tests.

[0181] The straight-line forward direction test, left turn test, and right turn test were conducted under operating conditions where the rotational speed of the front roller 20F was set to either acceleration or deceleration.

[0182] Therefore, during the execution of step S3, the detection speed V1 is used as the first detection speed, i.e., the detection speed V11 when moving forward in a straight line (V11L, V11R), the detection speed V12 when turning left (V12L, V12R), and the detection speed V13 when turning right (V13L, V23R).

[0183] Furthermore, during the execution of step S3, the detection speed V2 is used as the second detection speed, namely the detection speed V21 (V21L, V21R) when moving forward in a straight line, the detection speed V22 (V22L, V22R) when turning left, and the detection speed V23 (V23L, V23R) when turning right.

[0184] Thus, during the execution of step S3, the detection speeds V1 (V11 to V13) and V2 (V21 to V23) at one of the multiple set positions of the roller rotation center C2 can be detected. In addition, during the execution of step S3, the detection speeds V1 and V2 are detected at each detection period of the rotary detectors 81 and 82.

[0185] Back Figure 12 After step S3 is executed, in step S4, a drive signal SDP is given to the position changing mechanism MV from the control unit 80, and the position changing process of the roller rotation mechanism 3 by the position changing mechanism MV is executed. The position changing process is the process of changing the position of the roller rotation mechanism 3 without moving the vehicle 60 (including the tire rotation center C6).

[0186] That is, step S4 is the step of causing the position changing mechanism MV to perform position changing processing, changing the position of the roller rotation mechanism 3 to a new set position included in multiple set positions. As the position of the roller rotation mechanism 3 changes, the roller rotation center C2 also changes.

[0187] Figure 14 It means in Figure 12 The flowchart below shows the processing steps for the location change procedure in step S4. The processing steps for the location change procedure will be explained below with reference to this flowchart.

[0188] First, in step S4A, the control unit 80 controls the roller rotation mechanism 3 and the roller drive mechanism 8. With the roller pair 20 set to a straight forward direction, the front roller 20F is driven to rotate at a certain speed. At this time, the control unit 80 sends a drive signal SD3 to the roller rotation mechanism 3 and a drive signal SD8 to the roller drive mechanism 8 of the front roller device 2.

[0189] Here, drive signal SD3 is used to set the roller rotation mechanism 3 to a straight forward direction, and drive signal SD8 is used to indicate that the front roller 20F of the front roller device 2 for the front wheel is rotated at a certain speed.

[0190] Thus, step S4A is the step of performing the roller rotation action and the roller drive action, and rotating the front roller 20F at a certain speed while the roller pair 20 is set to the straight forward direction.

[0191] Then, in step S4B, under the roller rotation environment set in step S4A, the position changing mechanism MV performs position changing processing, changing the position of the roller rotation mechanism 3 to a new set position among multiple set positions. As the position of the roller rotation mechanism 3 changes, the position of the roller rotation center C2 also changes.

[0192] That is, step S4B is the step of causing the position changing mechanism MV to perform position changing processing under the roller rotation environment set by step S4A, and changing the position of the roller rotation mechanism 3 to the new set position.

[0193] Figure 15 It means by Figure 14 The flowchart illustrates the processing steps of the position change procedure in step S4B. As shown in the diagram, step S4B executes the left-right movement routine (SLR) followed by the forward-backward movement routine (SFB). Alternatively, the forward-backward movement routine (SFB) can be executed first, followed by the left-right movement routine (SLR).

[0194] Figure 16 It means by Figure 15 This diagram illustrates the execution of the SLR (Left-Right Movement) routine. Figure 17 and Figure 18 This is an explanatory diagram showing the state of roller devices 2L and 2R during the execution of the left-right movement routine SLR. Figure 17 This indicates the state at the start of execution of the left-right movement routine (SLR). Figure 18 This indicates the state at the end of the execution of the left / right movement routine (SLR). Additionally, in Figure 17 and Figure 18 Each of them describes an XYZ orthogonal coordinate system.

[0195] The following describes the processing of the left-right movement routine SLR with reference to these figures. Multiple set positions are specified by the coordinate position of the roller rotation center C2. Here, regarding the roller rotation center C2 (C2L, C2R), it is assumed that the absolute value of the movement in the X direction used to change from the current set position P0 to the new set position P1 is |ΔX1|, and the absolute value of the movement in the Y direction is |ΔY1|.

[0196] In addition, Figure 17 The text indicates the initial leftmost line EL0 of roller assembly 2L and the initial rightmost line ER0 of roller assembly 2R.

[0197] Furthermore, as described above, during the execution of step S2, since the vehicle 60 is mounted in a manner that is symmetrical about left and right relative to the center line CL between the roller devices 2L and 2R, the absolute values ​​of the movement in the left and right directions (X direction) are the same, and the movement directions are opposite.

[0198] Here, it is assumed that the roller assembly 2L is set to set positions P0 and P1. That is, it is assumed that set positions P0 and P1 represent the coordinate positions of the left roller rotation center C2L. Therefore, as Figure 17 As shown, the X-direction movement process of the roller rotation mechanism 3 from the set position P0 to the set position P1 is a process in which the right roller rotation center C2R moves in the -X direction by a movement amount of |ΔX1| while the left roller rotation center C2L moves in the +X direction by a movement amount of |ΔX1|.

[0199] In the above case, as a left-right movement routine SLR, the following steps S41 to S44 are executed in parallel. That is, the roller devices 2L and 2R simultaneously execute the first and second left-right movement processes included in the position change process.

[0200] In step S41, the first left-right movement process (movement amount + ΔX1) of the left-right movement mechanism 4B of the roller device 2L causes both the roller rotation mechanism 3 and the roller pair 20 to move in the +X direction. Regarding the first left-right movement process of the roller device 2L performed in step S41, the first left-right movement direction is the +X direction, and the left-right movement amount is |ΔX1.

[0201] In step S42, the first left-right movement process (movement content -ΔX1) of the left-right movement mechanism 4B of the roller device 2R causes both the roller rotation mechanism 3 and the roller pair 20 to move in the -X direction. Here, regarding the first left-right movement process of the roller device 2R, the first left-right movement direction is the -X direction, and the left-right movement amount is |ΔX1|.

[0202] In step S43, the second left-right movement process (movement content -ΔX1) of the left-right movement mechanism 4T of the roller device 2L causes only the roller rotation mechanism 3 and the roller pair 20 in the roller pair 20 to move in the -X direction. Here, regarding the second left-right movement process of the roller device 2L, the second left-right movement direction is the -X direction, and the left-right movement amount is |ΔX1|.

[0203] In step S44, the second left-right movement process (movement amount + ΔX1) of the left-right movement mechanism 4T of the roller device 2R causes only the roller rotation mechanism 3 and the roller pair 20 in the roller pair 20 to move in the +X direction. Here, regarding the second left-right movement process of the roller device 2R, the second left-right movement direction is the +X direction, and the left-right movement amount is |ΔX1|.

[0204] The left and right movement speeds along the left and right direction (X direction) of the first left and right movement processing performed by the left and right movement mechanism 4B of the roller device 2L, the first left and right movement processing performed by the left and right movement mechanism 4B of the roller device 2R, the second left and right movement processing performed by the left and right movement mechanism 4T of the roller device 2L, and the second left and right movement processing performed by the left and right movement mechanism 4T of the roller device 2R, as performed in steps S41 to S44 above, are also set to be the same.

[0205] In each of the roller devices 2L and 2R, the first left-right movement process performed by the left-right movement mechanism 4B and the second left-right movement process performed by the left-right movement mechanism 4T are executed simultaneously with the same left-right movement amount (|ΔX1|).

[0206] Furthermore, in each of the roller devices 2L and 2R, the first left-right movement direction and the second left-right movement direction are set to be opposite to each other. Specifically, in the roller device 2L, the first left-right movement direction is the +X direction and the second left-right movement direction is the -X direction; in the roller device 2R, the first left-right movement direction is the -X direction and the second left-right movement direction is the +X direction.

[0207] Therefore, as Figure 17 and Figure 18 As shown, the absolute positions of the roller pairs 20 in each of the roller devices 2L and 2R do not change before and after the execution of the first and second left-right direction movement processes performed by each of the roller devices 2L and 2R. Therefore, the positional relationship between the roller pairs 20 and the tires 6 (6L, 6R) in the X direction in each of the roller devices 2L and 2R also does not change.

[0208] like Figure 17 and Figure 18As shown, the parts whose absolute positions change after the execution of steps S41 to S44 are the main part of the left-right movement mechanism 4B (represented by the diagonal lines), the roller rotation mechanism 3, and a part of the left-right movement mechanism 4T. As a result, before and after the execution of steps S41 to S44, the initial leftmost line EL0 changes to the processed leftmost line EL1, and the initial rightmost line ER0 changes to the processed rightmost line ER1.

[0209] Thus, the chassis dynamometer 1 of this embodiment performs the first and second left-right movement processing of the roller device 2L and the first and second left-right movement processing of the roller device 2R simultaneously.

[0210] Therefore, the chassis dynamometer 1 of this embodiment can move the left roller rotation center C2L in the +X direction by a movement amount |ΔX1| and the right roller rotation center C2R in the -X direction by a movement amount |ΔX1| without changing the positional relationship between the roller pair 20 and the tire 6. That is, by executing the left-right movement routine SLR, the set position of the roller rotation mechanism 3 in the X direction relative to the tire rotation center C6 (C6L, C6R) can be changed.

[0211] Figure 19 It means by Figure 15 This diagram illustrates the execution of the forward / backward movement routine SFB. Figure 20 and Figure 21 This is an explanatory diagram showing the state of the roller device 2 (2L, 2R) when the forward and backward movement routine SFB is executed. Figure 20 This indicates the state at the start of execution of the forward / backward movement routine (SFB). Figure 21 This indicates the state at the end of the execution of the forward / backward movement routine (SFB). Additionally, in Figure 20 and Figure 21 Each of them describes an XYZ orthogonal coordinate system.

[0212] The following explanation, with reference to these figures, details the processing of the forward and backward movement routine SFB. Here, as the movement of the roller rotation mechanism 3, we envision the case where the roller rotation center C2 (C2L, C2R) moves in the +Y direction by an amount of movement |ΔY1|.

[0213] In addition, in the case of Figure 12 When step S2 is executed, since the tires 6L and 6R of the vehicle 60 are placed on the roller pair 20 of the roller device 2L and 2R without any positional deviation in the front-rear direction, the absolute value of the amount of movement in the front-rear direction (Y direction) is the same between the positional deviations between the left and right rotation centers, and the direction of movement is also the same.

[0214] As described above, assume that set positions P0 and P1 are established for the roller assembly 2L. That is, set positions P0 and P1 represent the coordinate positions of the left roller rotation center C2L. Therefore, as... Figure 20 As shown, the movement of the roller rotation mechanism 3 in the Y direction from the set position P0 to the set position P1 is a process that moves the left roller rotation center C2L in the +Y direction by a movement amount |ΔY1| and moves the right roller rotation center C2R in the +Y direction by a movement amount |ΔY1|.

[0215] In the above situations, such as Figure 19 As shown, as a forward and backward movement routine SFB, the following steps S45 to S48 are executed in parallel.

[0216] In step S45, the first forward and backward movement process (movement amount + ΔY1) of the forward and backward movement mechanism 5B of the roller device 2L causes both the roller rotation mechanism 3 and the roller pair 20 to move in the +Y direction. Here, regarding the first forward and backward movement process of the roller device 2L, the first forward and backward movement direction is the +Y direction, and the forward and backward movement amount is |ΔY1|.

[0217] In step S46, the first forward and backward movement process (movement amount + ΔY1) of the forward and backward movement mechanism 5B of the roller device 2R causes both the roller rotation mechanism 3 and the roller pair 20 to move in the +Y direction. Here, regarding the first forward and backward movement process of the roller device 2R, the first forward and backward movement direction is the +Y direction, and the forward and backward movement amount is |ΔY1|.

[0218] In step S47, the second forward and backward movement process (movement content -ΔY1) of the forward and backward movement mechanism 5T of the roller device 2L causes only the roller rotation mechanism 3 and the roller pair 20 in the roller pair 20 to move in the -Y direction. Here, regarding the second forward and backward movement process of the roller device 2L, the second forward and backward movement direction is the -Y direction, and the forward and backward movement amount is |ΔY1|.

[0219] In step S48, the second forward and backward movement process (movement content -ΔY1) of the forward and backward movement mechanism 5T of the roller device 2R causes only the roller rotation mechanism 3 and the roller pair 20 in the roller pair 20 to move in the -Y direction. Here, regarding the second forward and backward movement process of the roller device 2R, the second forward and backward movement direction is the -Y direction, and the forward and backward movement amount is |ΔY1|.

[0220] The forward and backward movement speeds along the forward and backward direction (Y direction) of the first forward and backward movement process performed by the forward and backward movement mechanism 5B of the roller device 2L, the first forward and backward movement process performed by the forward and backward movement mechanism 5B of the roller device 2R, the second forward and backward movement process performed by the forward and backward movement mechanism 5T of the roller device 2L, and the second forward and backward movement process performed by the forward and backward movement mechanism 5T of the roller device 2R, as performed in steps S45 to S48 above, are also set to be the same.

[0221] In each of the roller devices 2L and 2R, the first forward and backward movement process performed by the forward and backward movement mechanism 5B and the second forward and backward movement process performed by the forward and backward movement mechanism 5T are executed simultaneously with the same forward and backward movement amount (|ΔY1|).

[0222] Furthermore, in each of the roller devices 2L and 2R, the first forward and backward movement direction and the second forward and backward movement direction are set to be opposite directions. Specifically, in each of the roller devices 2L and 2R, the first left and right movement direction is the +Y direction, and the second left and right movement direction is the -Y direction.

[0223] Therefore, as Figure 20 and Figure 21 As shown, the absolute positions of the roller pairs 20 in each of the roller devices 2L and 2R do not change before and after the execution of the first and second forward and backward movement processes performed by each of the roller devices 2L and 2R. Therefore, the positional relationship between the roller pairs 20 in the Y direction and the tires 6 (6L, 6R) in each of the roller devices 2L and 2R also does not change.

[0224] like Figure 20 and Figure 21 As shown, after the execution of steps S41 to S44, the parts whose absolute positions have moved are a portion of the forward and backward moving mechanism 5B, the left and right moving mechanism 4B, the roller rotation mechanism 3, the left and right moving mechanism 4T, and a portion of the forward and backward moving mechanism 5T, which are indicated by the diagonal lines.

[0225] As described above, the chassis dynamometer 1 of this embodiment performs the first and second forward and backward movement processing of the roller device 2L and the first and second forward and backward movement processing of the roller device 2R simultaneously.

[0226] Therefore, the chassis dynamometer 1 of this embodiment can move the left roller rotation centers C2L and C2R relative to the tire rotation center C6 in the +Y direction by a movement amount |ΔY1| without changing the positional relationship between the roller pair 20 and the tire 6. That is, by executing the forward and backward movement routine SFB, the set position of the roller rotation mechanism 3 relative to the tire rotation center C6 (C6L, C6R) in the Y direction can be changed.

[0227] The chassis dynamometer 1 of this embodiment has a position changing mechanism MV that includes left-right movement mechanisms 4B and 4T and front-back movement mechanisms 5B and 5T, so it can perform the position changing process of the roller rotation mechanism 3 described above (see...). Figure 12 Step S4 Figure 14 , Figure 15 , Figure 19 ).

[0228] Therefore, the chassis dynamometer 1 of this embodiment can change the position of the roller rotation mechanism 3 relative to the tire rotation center C6 while the tire 6 is placed on the roller pair 20. Furthermore, by changing the position of the roller rotation mechanism 3, the position of the roller rotation center C2 relative to the tire rotation center C6 can also be changed.

[0229] Figure 22 It will be used as Figure 12 The diagram shows an example of the coordinates of multiple set positions of the object in step S4 of the position change processing, and an illustration of the processing steps, presented in tabular form.

[0230] As shown in the figure, the coordinates of the set values ​​are represented by (Xi (i = 1 to n), Yj (j = 1 to n)). The X coordinate Xi represents the coordinate in the X direction, which is the left-right direction of the vehicle 60. The Y coordinate Yj represents the coordinate in the Y direction, which is the forward-backward direction (straight-line forward direction) of the vehicle 60. In addition, as described above, the coordinates of each of the multiple set positions are set relative to the roller rotation center C2 (C2L) of the roller rotation mechanism 3.

[0231] exist Figure 22 The example shown represents (n×n) setting positions as multiple setting positions. Coordinates (X1, Y1) are the initial setting positions in step S1, and coordinates (X2, Y1) are the setting positions set by the position change process in the initial step S4. In addition, multiple setting positions are prepared in advance, for example, by setting a predetermined number of positions in the positive and negative directions of the X and Y coordinates relative to the wheelbase position described in the product manual of vehicle 60, etc., at intervals of tens of millimeters.

[0232] In the subsequent position change process of step S4, the set position of the roller rotation mechanism 3 is changed in the order of coordinates (X3, Y1), ..., (Xn, Y1), (X1, Y2), (X2, Y2), ..., (Xn, Y2), (X1, Y3), (X2, Y3), ..., (Xn, Yn).

[0233] For ease of explanation, the following describes the processing steps of position change in step S4, using the case of n=3 as an example. In this case, if... Figure 22 The circled numbers indicate that the processes (1) to (9) are executed in that order.

[0234] That is, the coordinates (X1, Y1) of process (1) are the initial setting position of step S1, and the coordinates (X2, Y1) of process (2) are the setting position set in the position change process of the first step S4.

[0235] In processes (3) to (9) in subsequent position change processes of step S4, the setting position of the roller rotation center C2 is changed in the order of coordinates (X3, Y1), (X1, Y2), (X2, Y2), (X3, Y2), (X1, Y3), (X2, Y3), (X3, Y3).

[0236] When process (4) is executed, the movement amount |ΔX1| is |X1-X3|. When X1>X3, the movement direction is the +X direction, and when X1<X3, the movement direction is the -X direction. Similarly, the movement amount |ΔY1| is |Y2-Y1|. When Y2>Y1, the movement direction is the +Y direction, and when Y2<Y1, the movement direction is the -Y direction.

[0237] For processes (2), (3), (5), (6), (8) and (9), since there is no change in the Y coordinate, the movement amount |ΔY1| is "0", the execution of the front-rear direction movement routine SFB is omitted, and simplification of the processing content of step S4B can be achieved.

[0238] Returning to Figure 12 , in step S5, it is confirmed whether the carrying roller acceleration and deceleration processing of step S3 has been completed at all of the plurality of setting positions (YES) or not (NO). Therefore, when the change to a new setting position has been performed in step S4, the determination of step S5 is "NO".

[0239] Thereafter, steps S3 and S4 are repeatedly executed until the determination of "YES" is made in step S5. Finally, when no change to a new setting position is performed in step S4, the determination of step S5 is "YES".

[0240] For example, in the example represented by Figure 22 , after the execution of the position change process from the coordinate (X(n-1), Yn) to the coordinate (Xn, Yn), when step S4 is executed through steps S5 and S3, the carrying roller acceleration and deceleration processing at all of the plurality of setting positions has been completed. In this case, no change to a new setting position is performed in step S4, and the determination of step S5 is "YES".

[0241] In step S6 executed when the determination of step S5 is YES, the control unit 80 determines the optimal setting position of the roller rotation center C2 of the roller rotation mechanism 3.

[0242] Thus, step S5 is a step in which steps S3 and S4 are executed repeatedly until step S3 has been executed at all of the multiple set locations.

[0243] Figure 23 It means in Figure 12 The flowchart in step S6 represents the first processing step of the optimal setting position determination process.

[0244] The control unit 80 obtains the detection speeds V1 and V2, which change constantly during the execution of steps S31 to S33, at each of the multiple set positions.

[0245] During the execution of step S31, the control unit 80 obtains the detection speeds V11 and V21 for straight-line forward movement as the detection speeds V1 and V2. During the execution of step S32, the control unit 80 obtains the detection speeds V12 and V22 for left turn as the detection speeds V1 and V2. During the execution of step S33, the control unit 80 obtains the detection speeds V13 and V23 for right turn as the detection speeds V1 and V2.

[0246] Therefore, during the execution of step S31, the control unit 80 can calculate the speed difference ΔV11 corresponding to the set position of the roller rotation mechanism 3 based on the speed difference between the detected speeds V11 and V21 during linear forward movement.

[0247] Here, the speed difference ΔV11 during straight-line forward movement can be used to calculate various speed differences, such as the average speed difference between the detected speeds V11 and V21 during a specified period of acceleration (the first type of speed difference), the average speed difference between the detected speeds V11 and V21 during a specified period of deceleration (the second type of speed difference), and the average speed difference between the first and second types of speed differences (the third type of speed difference).

[0248] Similarly, during the execution of step S32, the control unit 80 can calculate the left rotation speed difference ΔV12 corresponding to the set position of the roller rotation mechanism 3 based on the speed difference between the detected speeds V12 and V22 during left rotation.

[0249] Furthermore, during the execution of step S33, the control unit 80 can calculate the right-turn speed difference ΔV13 corresponding to the set position of the roller rotation mechanism 3 based on the speed difference between the detected speeds V13 and V23 during right-turn.

[0250] As the speed difference ΔV12 for left turns and ΔV13 for right turns, similar to the speed difference ΔV11 for straight-line movement, various speed differences, such as the first to third types mentioned above, can be calculated. Furthermore, multiple angles for left and right turns can be set, and speed differences can be calculated according to different turns.

[0251] Furthermore, since the roller device 2 is composed of roller devices 2L and 2R, the speed difference ΔV11 when moving forward in a straight line, the speed difference ΔV12 when turning left, and the speed difference ΔV13 when turning right are calculated for roller devices 2L and 2R respectively, as described above.

[0252] That is, for roller device 2L, calculate the speed difference ΔV11L when moving forward in a straight line, the speed difference ΔV12L when turning left, and the speed difference ΔV13L when turning right; for roller device 2R, calculate the speed difference ΔV11R when moving forward in a straight line, the speed difference ΔV12R when turning left, and the speed difference ΔV13R when turning right.

[0253] Thus, during the execution of step S3 (S31 to S33), the control unit 80 can calculate six speed differences (ΔV11L, ΔV11R, ΔV12L, ΔV12R, ΔV13L and ΔV13R) for multiple set positions respectively.

[0254] Therefore, when the execution of step S6 begins, the control unit 80 can calculate multiple speed differences corresponding to multiple set positions.

[0255] Back Figure 24 In step S61, the control unit 80 applies the following formula (1) to calculate the sum of speed differences (SMV) for each of the multiple set positions. The sum of speed differences (SMV) is the speed difference for determination.

[0256] SMV=ΔV11L+ΔV12L+ΔV13L+ΔV11R+ΔV12R+ΔV13R…(1)

[0257] After step S61 is executed, the sum of multiple speed differences (SMV) corresponding to the multiple set positions is calculated. For example, if there are N set positions, the sum of N speed differences (SMV) is calculated.

[0258] Next, in step S62, the control unit 80 determines the setting position where the sum of speed differences (SMV) among the multiple setting positions is the smallest as the optimal setting position. That is, if the smallest sum of speed differences (SMV) among the multiple sums of speed differences used for determination is defined as the minimum sum of speed differences (SMV(MIN)), then the setting position corresponding to the minimum sum of speed differences (SMV(MIN)) among the multiple setting positions is the optimal setting position.

[0259] Figure 24 It means in Figure 12 The flowchart in step S6 shows the second processing step of the optimal setting position determination process. In this figure, the maximum velocity difference MXV is calculated in step S63.

[0260] As described above, when the execution of step S6 begins, the control unit 80 calculates the above six speed differences (ΔV11L, ΔV11R, ΔV12L, ΔV12R, ΔV13L and ΔV13R) corresponding to the multiple set positions respectively.

[0261] In step S63, the control unit 80 calculates the maximum speed difference MXV for each of the multiple set positions using the following formula (2). This maximum speed difference MXV is the speed difference for determination.

[0262] MXV=MAX(ΔV11L, ΔV12L, ΔV13L, ΔV11R, ΔV12R, ΔV13R)

[0263] …(2)

[0264] In equation (2), MAX(...) is a function that takes the parameter with the maximum value among the parameters in parentheses as the maximum speed difference MXV.

[0265] After step S63 is executed, multiple maximum speed differences MXV corresponding to multiple set positions are calculated. For example, if there are N set positions, N maximum speed differences MXV are calculated.

[0266] Next, in step S64, the control unit 80 determines the setting position where the maximum speed difference MXV among the multiple setting positions is the smallest as the optimal setting position. That is, if the smallest maximum speed difference MXV among the multiple maximum speed differences MXV used as multiple determination speed differences is set as the minimum maximum speed difference value MXV(MIN), then the setting position corresponding to the minimum maximum speed difference value MXV(MIN) among the multiple setting positions is the optimal setting position.

[0267] In this way, it is possible to execute including Figure 23 and Figure 24 The optimal setting position is determined by step S6 of the first and second processing steps. It is speculated that the optimal setting position of the roller rotation mechanism 3 is the closest positional relationship between the tire rotation center C6 and the roller rotation center C2, ideally the position where the roller rotation center C2 and the tire rotation center C6 are the same.

[0268] Back Figure 12 After step S6 is executed, in step S7, the position changing mechanism MV performs position changing processing, and the roller rotation mechanism 3 moves to the optimal set position.

[0269] By executing step S7 under the control of the control unit 80, the roller rotation mechanism 3 can be moved automatically to achieve the closest positional relationship between the tire rotation center C6 and the roller rotation center C2, ideally with the roller rotation center C2 and the tire rotation center C6 aligned.

[0270] In addition, the process of step S7 is performed, for example, with the same content as Figure 14 steps S4A and S4B. In step S6, when the coordinates (X3, Y3) among a plurality of set positions represented by Figure 22 are determined as the optimal setting position, the movement amount |ΔX1| is |X3 - Xn|, the movement direction is +X direction when X3 > Xn, and the movement direction is -X direction when X3 < Xn. Similarly, the movement amount |ΔY1| is |Y3 - Yn|, the movement direction is +Y direction when Y3 > Yn, and the movement direction is -Y direction when Y3 < Yn.

[0271] (Effect)

[0272] In the chassis dynamometer 1 serving as the vehicle testing device of the present embodiment, by executing the rotation center setting process including steps S3 to S7 Figure 12 under the control of the control unit 80, the roller rotation mechanism 3 can be automatically arranged at the optimal setting position corresponding to the minimum determination speed difference among the plurality of determination speed differences (speed difference sum SMV or maximum speed difference MXV).

[0273] Therefore, the chassis dynamometer 1 of the present embodiment can automatically move the roller rotation mechanism 3 to achieve the positional relationship where the tire rotation center C6 is closest to the roller rotation center C2, and ideally, the roller rotation center C2 coincides with the tire rotation center C6.

[0274] As a result, the chassis dynamometer 1 of the present embodiment can accurately perform various driving tests on the vehicle 60 without the occurrence of tire position deviation during the execution of the driving test.

[0275] In the chassis dynamometer 1 of the present embodiment, the detected speed differences include the speed difference ΔV11 when traveling straight, the speed difference ΔV12 when turning left, and the speed difference ΔV13 when turning right.

[0276] Therefore, when executing step S6, the control unit 80 of the chassis dynamometer 1 of the present embodiment can accurately calculate the plurality of determination speed differences (speed difference sum SMV, maximum speed difference MXV) corresponding to the plurality of set positions based on the speed difference ΔV11 when traveling straight, the speed difference ΔV12 when turning left, and the speed difference ΔV13 when turning right.

[0277] The control unit 80 executes, as step S6, the following Figure 23Steps S61 and S62, as shown in the diagram, determine the optimal setting position as the minimum speed difference sum SMV(MIN) among the multiple speed difference sums SMV. Therefore, the chassis dynamometer 1 of this embodiment can determine the optimal setting position through relatively simple calculation processing, making it suitable for comprehensive driving tests of the roller rotary mechanism 3.

[0278] Control unit 80 performs step S6 as follows: Figure 24 Steps S63 and S64, as shown in the diagram, determine the optimal setting position as the setting position corresponding to the minimum maximum speed difference MXV(MIN) among multiple maximum speed differences MXV. Therefore, the chassis dynamometer 1 of this embodiment can determine the optimal setting position by taking into account the local driving test of the roller rotation mechanism 3 through relatively simple calculation processing. In addition, "considering the local driving test" refers to considerations such as ensuring that the limited driving test, such as "left turn driving test", does not deteriorate.

[0279] Furthermore, the speed difference used for determination is not limited to the sum of speed differences (SMV) or the maximum speed difference (MXV) mentioned above, but can be set in various ways based on the speed difference between the detected speeds V1 and V2.

[0280] In this embodiment, the control unit 80 of the chassis dynamometer 1 includes the step S4... Figure 14 In steps S4A and S4B, the rotation angle of the roller rotation mechanism 3 is set to the linear forward direction, and the position change process is performed under roller rotation conditions in which the front roller 20F, which is the first roller, rotates at a certain speed. Therefore, the deformation of the tire 6 can be avoided when the position change process in step S4 is executed.

[0281] This is because performing the position change process while rotating the front roller 20F does not exert excessive force on the tire 6. On the other hand, if the position change process is performed while the rotation of the front roller 20F is stopped, the tire 6 is more likely to deform.

[0282] As a result, the chassis dynamometer 1 of this embodiment can improve the accuracy of the detection speeds V1 and V2 obtained in step S3 as the first and second detection speeds, and thus can improve the accuracy of the optimal setting position determined in step S6.

[0283] In this embodiment, the chassis dynamometer 1 is a roller device 2, which includes roller devices 2L and 2R. Therefore, when the control unit 80 executes step S6, it can calculate the speed difference for determining whether balance is achieved between the left and right tires 6L and 6R based on the left detection speed difference and the right detection speed difference.

[0284] In addition, the left-side speed difference detection includes the speed difference ΔV11L when moving forward in a straight line, the speed difference ΔV12L when turning left, and the speed difference ΔV13L when turning right. The right-side speed difference detection includes the speed difference ΔV11R when moving forward in a straight line, the speed difference ΔV12R when turning right, and the speed difference ΔV13R when turning right.

[0285] Therefore, the chassis dynamometer 1 of this embodiment can determine the optimal setting position that achieves balance between tires 6L and 6R.

[0286] The chassis dynamometer 1 of this embodiment includes left and right movement mechanisms 4B and 4T, front and back movement mechanisms 5B and 5T, and a position change mechanism MV that performs the above-described position change processing.

[0287] Here, we consider the initial state when the tires 6 of the vehicle 60 are positioned on the roller pair 20 of the roller device 2, such as... Figure 26 of (a), Figure 26 As shown in (b), the tire rotation center C6 deviates from the roller rotation center C2.

[0288] That is, in the initial state, such as Figure 26 of (a), Figure 26 As shown in (b), imagine a situation where there is a deviation DX (DX2) in the X direction and a deviation DY (DY2) in the Y direction between the tire rotation center C6 and the roller rotation center C2.

[0289] As described above, the roller assembly 2 (2L, 2R) of the chassis dynamometer 1 in this embodiment includes... Figures 2-6 The left-right moving mechanisms 4B and 4T and the front-back moving mechanisms 5B and 5T are shown in the figure. The position changing mechanism MV can perform position changing processing to change the position of the roller rotation mechanism 3 (roller rotation center C2) relative to the tire rotation center C6 of the tire 6 mounted on the roller pair 20.

[0290] Therefore, the control unit 80 of the chassis dynamometer 1 in this embodiment can control the position change mechanism MV and perform position change processing of the roller rotation mechanism 3 in each of steps S4 and S7.

[0291] Furthermore, the chassis dynamometer 1 of this embodiment can change the position of the roller rotation mechanism 3 relative to the tire rotation center C6 of the tire 6 placed on the roller pair 20 while the tire 6 is placed on the roller pair 20, and finally set the roller rotation mechanism 3 to the optimal setting position.

[0292] Therefore, the ideal configuration of the chassis dynamometer 1 in this embodiment is to position the roller rotation mechanism 3 at the optimal setting position where the tire rotation center C6 coincides with the roller rotation center C2.

[0293] As a result, the chassis dynamometer 1 of this embodiment can perform driving tests of the vehicle 60 with good accuracy without tire position deviation during driving tests.

[0294] By simultaneously performing position change processing on the roller devices 2L and 2R of the chassis dynamometer 1, the vehicle 60 can perform position change processing in a balanced manner without moving between tires 6L and 6R. The position change processing includes first and second left-right direction movement processing (steps S41 to S44) and first and second front-rear direction movement processing (steps S45 to S48).

[0295] In addition to the left-right movement mechanisms 4B and 4T, the chassis dynamometer 1 of this embodiment also has front-back movement mechanisms 5B and 5T5. It is capable of performing the first and second front-back movement processes performed by the front-back movement mechanisms 5B and 5T.

[0296] Thus, the chassis dynamometer 1 of this embodiment performs the test by placing the tires 6 of the vehicle 60 on the roller pair 20 and executing the test. Figure 12 Steps S3 to S7 represent the rotation center setting process, which can configure the roller rotation mechanism 3 to the optimal setting position so that ideally, the tire rotation center C6 and the roller rotation center C2 are aligned when viewed from above.

[0297] Therefore, by configuring the roller rotation mechanism 3 to the optimal setting position, various driving tests of the vehicle 60 can be performed under the ideal condition that the tire rotation center C6 and the roller rotation center C2 are aligned, thus greatly improving the accuracy of the driving test of the vehicle 60 accompanied by the roller rotation action and the tire rotation action.

[0298] This point will be described in detail below. Figure 25 This is an explanatory diagram illustrating the above-described effects of the chassis dynamometer 1 according to this embodiment.

[0299] Figure 25 (a) and Figure 25 (b) is a top view and a side view showing the positional relationship between roller pairs 20 (20F, 20B) and tire 6 when the vehicle is in a straight-forward state (initial state). Figure 25 (c) and Figure 25 (d) is a top view and a side view showing the positional relationship between the roller pair 20 and the tire 6 when the vehicle's tire 6 and roller pair 20 have been rotated. Figure 25 (a)~ Figure 25 (d) Each of them describes an XYZ orthogonal coordinate system.

[0300] exist Figure 25The front roller 20F is used as a load-bearing roller, and the rear roller 20R is used as a free roller. Therefore, the tire rotation direction K2F of the front roller 20F is opposite to the tire rotation direction K6 of the tire 6, and the tire rotation direction K6 of the tire 6 is opposite to the tire rotation direction K2R of the rear roller 20R.

[0301] In addition, regarding Figure 25 (c) Figure 25 The X-axis and Y-axis shown in (d) are for reference... Figure 25 (a) Figure 25 (b) For the time being, it is easy to compare and thus temporarily makes it the same as... Figure 25 (a) Figure 25 (b) The X and Y axes are aligned. In reality, the relationship between the tire 6 and the roller pair 20 and the X and Y axes changes with the rotation of the rollers and the tire.

[0302] In the Figure 25 In the illustrated dual-roller structure, the roller rotation mechanism 3 is capable of performing a roller rotation operation that rotates the roller pair 20 around the roller rotation center C2 along the roller rotation direction R2. On the other hand, the vehicle 60 is capable of performing the aforementioned tire rotation operation.

[0303] Reference Figure 25 This describes the effect of the roller device 2 with a double roller structure having roller pairs 20.

[0304] like Figure 25 (a) Figure 25 As shown in (b), the execution is performed by Figure 12 Steps S3 to S7 represent the results of the rotation center setting process. Ideally, the tire rotation center C6 of tire 6 is consistent with the roller rotation center C2 of roller pair 20.

[0305] For example, consider in Figure 12 After step S2 is executed, as follows Figure 26 of (a), Figure 26 As shown in (b), a positional deviation between the rotation centers, including deviations DX2 and DY2, occurred between the roller rotation center C2 and the tire rotation center C6.

[0306] Under such circumstances, it is also by Figure 12 After the execution of steps S3 to S7, which represent the rotation center setting process, ideally, it can be achieved as follows: Figure 25 (a) Figure 25 (b) Make the tire rotation center C6 and the roller rotation center C2 in the XY plane aligned as shown.

[0307] The following is about Figure 25 Please provide an explanation. For example... Figure 25 (a) Figure 25As shown in (b), when the vehicle 60 is moving in a straight line, the positional relationship between the tire 6 and the roller pair 20 is constant and does not change.

[0308] Furthermore, such as Figure 25 (c) Figure 25 As shown in (d), even when the tire rotation and roller rotation are performed, the positional relationship between the tire 6 and the roller pair 20 remains constant.

[0309] Thus, the chassis dynamometer 1 of this embodiment automatically configures the roller rotation mechanism 3 to the optimal setting position, ideally enabling it to perform driving tests on the vehicle 60 with the tire rotation center C6 and the roller rotation center C2 aligned.

[0310] That is, such as Figure 25 As shown, the chassis dynamometer 1 of this embodiment can place the tires 6 of the vehicle 60 on the roller pair 20 of the roller device 2, and perform the vehicle 60 driving test with good accuracy while the tire position deviation does not occur during the driving test.

[0311] Back Figure 2 In this embodiment, the roller assembly 2 (2L, 2R) of the chassis dynamometer 1 is provided with a roller rotation mechanism 3, left-right movement mechanisms 4B and 4T, and front-back movement mechanisms 5B and 5T along the height direction (Z direction) between the base 25 and the roller drive mechanism 8 having roller pairs 20. Therefore, the roller assembly 2 of this embodiment can include the roller rotation mechanism 3, the left-right movement mechanisms 4B and 4T, and the front-back movement mechanisms 5B and 5T without increasing the device area.

[0312] <Other>

[0313] In the above embodiments, a chassis dynamometer 1 is cited as a vehicle testing device, but the vehicle testing device is not limited to a chassis dynamometer. For example, a free roller testing device may be used instead of the chassis dynamometer 1 as a vehicle testing device. The free roller testing device is a device that applies acceleration and deceleration loads to the vehicle 60 solely by the weight of the roller pair 20, and does not transmit power to the roller pair 20.

[0314] However, in the free roll testing device, when positioning the roll rotation mechanism 3, the front roll 20F can be rotated via a belt or the like. Therefore, even devices that do not have a motor to apply load to the roll pair 20, such as a chassis dynamometer, can be used as vehicle testing devices.

[0315] Thus, the vehicle testing apparatus of the present invention includes a chassis dynamometer or a free roller testing apparatus.

[0316] Furthermore, within the scope of its disclosure, the embodiments of the present invention can be appropriately modified or omitted.

[0317] Label Explanation

[0318] 1 Chassis dynamometer

[0319] 2, 2L, 2R roller assembly

[0320] 3-roller rotary mechanism

[0321] 4B, 4T left and right direction moving mechanism

[0322] 5B, 5T forward and backward movement mechanism

[0323] 6, 6L, 6R tires

[0324] 8-roll drive mechanism

[0325] 20 roller pairs

[0326] 20F front roller

[0327] 20R rear roller

[0328] 60 vehicles

[0329] 80 Control Department

[0330] Rotary detectors 81, 81L, 81R, 82, 82L, and 82R

[0331] C2 Roller Rotation Center

[0332] C2L Left Roller Rotation Center

[0333] C2R Right Roll Rotation Center

[0334] C6 Tire Rotation Center

[0335] C6L left tire rotation center

[0336] C6R right tire rotation center

[0337] MV Location Change Agency

Claims

1. A vehicle testing device, comprising a roller assembly and a control unit, characterized in that, The above-mentioned roller device includes: Rollers 1 and 2 carry the vehicle's tires; The roller drive mechanism performs the roller drive action that drives the first roller to rotate. The first rotation detector detects the rotation speed of the first roller to obtain the first detection speed; The second rotation detector detects the rotation speed of the second roller to obtain the second detection speed; The roller rotation mechanism performs a roller rotation operation that causes the first and second rollers to rotate; and The position changing mechanism performs a position changing process that changes the position of the roller rotation mechanism relative to the tire rotation center of the tire mounted on the first and second rollers. The first roller is used as a self-rotating load roller, and the second roller is used as a free roller that rotates in conjunction with the rotation of the tire. The aforementioned control unit, Upon receiving the first detection speed and the second detection speed, the roller drive mechanism, the roller rotation mechanism and the position change mechanism are controlled to perform the roller drive action, the roller rotation action and the position change process. Multiple preset positions are prepared for the position of the roller rotation mechanism relative to the tire rotation center; The control unit performs rotation center setting processing when the roller rotation mechanism is set to an initial setting position included in the plurality of setting positions and the vehicle's tires are configured and fixed on the first and second rollers. The above-mentioned slewing center setting process includes: (a) Performing the above-mentioned roller rotation action and roller drive action, and in the state that the first roller and the second roller are set to a specified rotation direction, rotating the first roller to perform the above-mentioned hypothetical driving test of the vehicle, and obtaining the above-mentioned first detection speed and second detection speed. (b) Perform the above position change process to change the position of the roller rotation mechanism to a new set position included in the plurality of set positions; (c) Repeat steps (a) and (b) above until step (a) above has been performed at all of the above-mentioned multiple set locations; (d) The step of calculating multiple determination speed differences corresponding to the multiple set positions based on the detection speed differences between the first detection speed and the second detection speed at each of the multiple set positions, and determining the set position corresponding to the minimum determination speed difference among the multiple determination speed differences as the optimal set position; and (e) Perform the above position change process to move the roller rotation mechanism to the above optimal set position.

2. The vehicle testing apparatus as described in claim 1, characterized in that, Step (a) above includes: (a-1) With the first and second rollers set in a straight-line forward direction, the first roller is rotated by accelerating or decelerating the rotation speed to perform a straight-line forward driving test of the vehicle, and the first and second detection speeds are obtained as the first detection speed and the second detection speed during straight-line forward driving. (a-2) With the first and second rollers set to the left turn direction, the first roller is rotated by accelerating or decelerating the rotation speed to perform a left turn driving test of the vehicle, and the first and second detection speeds are obtained as the first detection speed and the second detection speed during left turn. (a-3) With the first and second rollers set to the right turn direction, the first roller is rotated by accelerating or decelerating the rotation speed to perform the right turn driving test of the vehicle, and the first and second detection speeds are obtained as the first detection speed and the second detection speed during the right turn. The aforementioned turning directions include the aforementioned straight-line forward direction, the aforementioned left turning direction, and the aforementioned right turning direction; The above hypothetical driving tests include the above straight-line driving test, the above left-turn driving test, and the above right-turn driving test. The aforementioned first detection speed includes the aforementioned first detection speed when moving in a straight line, the aforementioned first detection speed when turning left, and the aforementioned first detection speed when turning right; The aforementioned second detection speed includes the aforementioned second detection speed when moving in a straight line, the aforementioned second detection speed when turning left, and the aforementioned second detection speed when turning right; The aforementioned detection speed difference includes the straight-line forward speed difference, which is the speed difference between the first detection speed and the second detection speed during straight-line forward movement; the left-turn speed difference, which is the speed difference between the first detection speed and the second detection speed during left-turn turn; and the right-turn speed difference, which is the speed difference between the first detection speed and the second detection speed during right-turn turn.

3. The vehicle testing apparatus as described in claim 2, characterized in that, The speed difference used for the above determination includes the sum of the speed difference when moving forward in a straight line, the speed difference when turning left, and the speed difference when turning right. The sum of multiple speed differences corresponds to the multiple set positions.

4. The vehicle testing apparatus as described in claim 2, characterized in that, The speed difference used for the above determination includes the maximum speed difference among the speed difference when moving forward in a straight line, the speed difference when turning left, and the speed difference when turning right. The multiple maximum speed differences correspond to the multiple preset positions.

5. The vehicle testing apparatus as described in any one of claims 1 to 4, characterized in that, Step (b) above includes: (b-1) The step of performing the above-mentioned roller rotation operation and roller drive operation, and rotating the first roller at a certain speed while setting the first roller and the second roller in a straight forward direction; and (b-2) Perform the above position change process in the roller rotation environment set by step (b-1) above, and change the position of the roller rotation mechanism to the new set position.

6. The vehicle testing apparatus as described in any one of claims 1 to 4, characterized in that, The roller device described above is a device for placing a pair of tires at the front or rear of the vehicle, the pair of tires including a left tire and a right tire. The above-mentioned roller device includes: A left-side roller device is provided corresponding to the left tire of the aforementioned vehicle; and The right-hand roller device is provided in accordance with the right tire of the aforementioned vehicle; The aforementioned left roller device and the aforementioned right roller device simultaneously perform the aforementioned position change processing; The first detection speed and the second detection speed obtained from the first rotary detector and the second rotary detector of the left-hand roller device are defined as the left-hand first detection speed and the left-hand second detection speed; The first detection speed and the second detection speed obtained from the first rotary detector and the second rotary detector of the right-hand roller device are defined as the first detection speed and the second detection speed for right-hand use; The aforementioned first detection speed includes the aforementioned first detection speed used on the left and the aforementioned first detection speed used on the right. The second detection speed mentioned above includes the second detection speed used on the left and the second detection speed used on the right.

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