Chassis dynamometer system

Abstract

The present invention aims to obtain a chassis dynamometer system that can perform vehicle simulation with high precision. A generator control device (75) and an ADAS test control device (77) control a target simulator (11) and an image simulator (12) based on a rotation pulse signal (S71), a steering detection signal (S60) and external sensing information (S74) to perform vehicle simulation. At this time, as part of the vehicle simulation, a process is performed to rotate a roller rotation mechanism (21) based on a steering detection signal (S60) in a roller rotation direction (R2) under the control of the generator control device (75). Most of the four vehicle holding mechanisms (3) that fix the vehicle (60) are arranged below the bottom of the vehicle body (60).

Description

Technical Field

[0001] The present disclosure relates to a chassis dynamometer system that performs vehicle simulations. Background Art

[0002] Chassis dynamometers are conventionally used for testing vehicle (automobile) driving and include a roller device as a primary component. Chassis dynamometers also include a vehicle securing mechanism (vehicle securing means) for securing the vehicle mounted on the roller device during testing. For example, a conventional chassis dynamometer is disclosed in Patent Document 1.

[0003] Patent Document 1 discloses a rope tying structure as a vehicle fixing means for fixing a vehicle disposed on a roller device from the front-rear direction of the vehicle using a vehicle tying rope when testing the vehicle.

[0004] Furthermore, as a vehicle fixing means that replaces the rope binding structure, for example, Patent Document 2 discloses a dedicated vehicle fixing structure.

[0005] Figure 12 as well as Figure 13 This is a perspective view schematically showing a conventional chassis dynamometer 101 represented by Patent Document 1. Figure 12 The structure of the vehicle 60 before being fixed is shown. Figure 13 The vehicle 60 is shown in a secured configuration. Figure 12 as well as Figure 13 XYZ orthogonal coordinate systems are shown respectively.

[0006] Four roller devices 102 are provided corresponding to the four openings 85 provided in the floor surface 80. Each of the four roller devices 102 includes a roller pair 120 and a roller support mechanism 122. The roller support mechanism 122 supports the roller pair 120 so that the two rollers in the roller pair 120 can rotate. Alternatively, a single roller may be used in place of the roller pair 120.

[0007] The roller device 102 on the rear (-Y direction) side further includes a support base 124 and a moving guide rail 123 provided on the support base 124 and extending in the Y direction. The support base 124 supports the roller support mechanism 122 so that it can move in the Y direction along the moving guide rail 123.

[0008] In each of the four roller devices 102, the top of the roller pair 120 partially protrudes from the corresponding opening 85 on the floor surface 80. The four roller pairs 120 are arranged at positions corresponding to the front and rear wheels of the vehicle 60.

[0009] On the floor surface 80 , a total of four vehicle fixing rods 103 are provided in front of (in the +Y direction) and behind (in the −Y direction) the four roller devices 102 .

[0010] Furthermore, an engine cooling fan 106 is provided on the floor surface 80 in front of the center portion of the four roller devices 102 .

[0011] like Figure 13 As shown, four tires 62 of a vehicle 60 are placed on roller pairs 120 of each of the four roller devices 102. The four tires 62 are placed on two rollers constituting the corresponding roller pairs 120, respectively.

[0012] Then, the front of the vehicle 60 is fixed to the two vehicle fixing rods 103 using the vehicle tying ropes 104. Similarly, the rear of the vehicle 60 is fixed to the two vehicle fixing rods 103 (at Figure 13 (not shown) fixed.

[0013] In addition, if Figure 13 As shown, an exhaust hose 107 is further provided, one end of which is connected to the rear portion of the vehicle 60. One end of the exhaust hose 107 serves as an input port, and the other end serves as an output port. The exhaust gas discharged from the vehicle 60 is received at the input port (one end) and discharged to the outside through the output port (the other end).

[0014] In addition, Figure 13 In the figure, for convenience of explanation, the structure under the floor surface 80, the two vehicle fixing rods 103 at the rear, and the engine cooling fan 106 at the front are omitted.

[0015] Prior art literature

[0016] Patent Literature

[0017] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-203869

[0018] Patent Document 2: Japanese Patent Application Laid-Open No. 2011-33517 Summary of the Invention

[0019] Problems that the invention will solve

[0020] The conventional chassis dynamometer 101 is configured as described above, and adopts a rope-binding method for fixing the vehicle 60 using the vehicle-fixing rod 103 and the vehicle-binding rope 104 .

[0021] However, conventional rope tying methods require the removal of the bumper, etc., when attaching the vehicle tying rope 104 to the vehicle 60. Generally, since the bumper is equipped with an external sensor, it is difficult to conduct a driving test of the vehicle 60 using the external sensor. Other possible external sensors include radar, which is used as a corner sensor, and laser radar (LiDAR).

[0022] In addition, in Figure 13 After the vehicle 60 is secured by the rope tying method as shown, a vehicle simulation using an image simulator and an object simulator is considered using sensor detection information related to the operation of the vehicle 60 and detection information from external sensors.

[0023] In this case, in conventional chassis dynamometer 101, vehicle securing rod 103, vehicle tying rope 104, engine cooling fan 106, and exhaust hose 107 are located within the detection range of the external sensor. Consequently, a system including conventional chassis dynamometer 101 has the problem of being unable to perform vehicle simulation with high accuracy.

[0024] Furthermore, in the conventional rope tying method, when performing an acceleration and deceleration test of the vehicle 60 , the positional relationship between the vehicle 60 and the image simulator or the target simulator deviates, and thus there is a problem in that the vehicle simulation cannot be performed with high accuracy.

[0025] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a chassis dynamometer system that can perform vehicle simulation with high accuracy.

[0026] Means for solving problems

[0027] The chassis dynamometer system disclosed in the present invention is capable of performing vehicle simulation on a floor surface, and the chassis dynamometer system comprises: a roller device having a roller for carrying a tire of a vehicle; a vehicle holding mechanism disposed on the floor surface and fixing the vehicle; a rotation detection unit for detecting the rotation state of the roller and obtaining a rotation detection signal; a steering detector for detecting the steering state of the vehicle and obtaining a steering detection signal; a simulation auxiliary component disposed on the floor surface in front of the vehicle; and a control device for controlling the simulation auxiliary component based on the rotation detection signal and the steering detection signal to perform the vehicle simulation, the roller device including a roller rotation mechanism disposed under the floor surface and supporting the roller so as to be capable of rotation, the vehicle holding mechanism being disposed below the bottom of the vehicle body, and the vehicle simulation including control processing of the roller rotation mechanism based on the steering detection signal.

[0028] Effects of the Invention

[0029] The chassis dynamometer system of the present disclosure executes a vehicle simulation including a control process of a roller turning mechanism based on a steering detection signal by a control device.

[0030] Therefore, the chassis dynamometer system of the present disclosure is capable of executing vehicle simulations including steering operations other than straight driving.

[0031] In addition, the vehicle holding mechanism in the chassis dynamometer system of the present disclosure is disposed below the bottom of the vehicle body, so the presence of the vehicle holding mechanism does not hinder the visual recognition of the simulated auxiliary components.

[0032] As a result, the chassis dynamometer system of the present disclosure can secure the vehicle using the vehicle gripping mechanism and can perform vehicle simulation with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a perspective view schematically showing a chassis dynamometer system as an embodiment of the present disclosure.

[0034] Figure 2 This is an explanatory diagram schematically showing the planar configuration of the chassis dynamometer system according to the embodiment (before the vehicle is fixed).

[0035] Figure 3 This is an explanatory diagram schematically showing the planar configuration of the chassis dynamometer system according to the embodiment (after the vehicle is fixed).

[0036] Figure 4 It is an explanatory diagram schematically showing the detailed structure (planar structure) of the vehicle gripping mechanism according to the embodiment.

[0037] Figure 5 It is an explanatory diagram schematically showing a detailed structure (cross-sectional structure) of the vehicle gripping mechanism according to the embodiment.

[0038] Figure 6 Yes Figure 4 as well as Figure 5 1 is an explanatory diagram of the cross-sectional structure of the arm shaft portion in the arm shown in .

[0039] Figure 7 Yes Figure 4 as well as Figure 5 Detailed description of the clamping portion and its surrounding structure (planar structure) shown in FIG.

[0040] Figure 8 Yes Figure 4 as well as Figure 5 Detailed description of the clamping portion and its surrounding structure (cross-sectional structure) shown in FIG.

[0041] Figure 9This is a flowchart showing a method for securing a vehicle using the vehicle gripping mechanism according to the present embodiment.

[0042] Figure 10 It is a perspective view schematically showing the structure of the chassis dynamometer system according to the embodiment after the vehicle is fixed.

[0043] Figure 11 This is a block diagram showing the configuration of a control system for vehicle simulation executed by the chassis dynamometer system according to the embodiment with the vehicle fixed.

[0044] Figure 12 This is a perspective view schematically showing a conventional chassis dynamometer (before the vehicle is fixed).

[0045] Figure 13 This is a perspective view schematically showing a conventional chassis dynamometer (with the vehicle fixed).

[0046] Description of Reference Numerals

[0047] 1 Chassis dynamometer system

[0048] 2-roller unit

[0049] 3 Vehicle control mechanism

[0050] 6 Engine cooling fan

[0051] 7 Exhaust hose

[0052] 10 Floor

[0053] 11 Target Simulator

[0054] 12 Image Simulator

[0055] 20 roller pairs

[0056] 21 Roller rotation mechanism

[0057] 32 base

[0058] 33 arms

[0059] 34 clamping part

[0060] 44 bolts

[0061] 45 Clamping pin

[0062] 60 vehicles

[0063] 61 threshold

[0064] 71 Dynamometer detector

[0065] 72 Steering detector

[0066] 74 External Sensors

[0067] 75 Generator control device

[0068] 77 ADAS test control device DETAILED DESCRIPTION

[0069] <Implementation Method>

[0070] Figure 1 It is a perspective view schematically showing a chassis dynamometer system 1 as an embodiment of the present disclosure. Figure 1 The structure before the vehicle 60 is fixed is shown. The chassis dynamometer system 1 of the present embodiment can execute a vehicle simulation described in detail later on the floor surface 80 . Figure 1 The XYZ orthogonal coordinate system is shown in .

[0071] like Figure 1 As shown, four roller devices 2 are provided corresponding to the four roller openings 15 provided in the floor surface 10. The four roller devices 2 each include a roller pair 20, a roller rotating mechanism 21, and a roller supporting mechanism 22.

[0072] The roller rotating mechanism 21 supports the roller pair 20 so that the two rollers in the roller pair 20 can rotate. The roller supporting mechanism 22 supports the roller rotating mechanism 21 so that the roller rotating mechanism 21 can rotate in the roller rotating direction R2.

[0073] The roller device 2 on the rear (-Y direction) side further includes a moving guide rail 23 and a support base 24. The moving guide rail 23 is provided on the support base 24 and extends in the Y direction. The support base 24 supports the roller support mechanism 22 and the roller pair 20 on the roller support mechanism 22 so that the roller support mechanism 22 can move in the Y direction along the moving guide rail 23. Alternatively, a single roller may be used instead of the roller pair 20.

[0074] In each of the four roller devices 2, the top of the roller pair 20 partially protrudes from the corresponding roller opening 15 above the floor surface 10. Furthermore, the four roller pairs 20 are arranged at positions corresponding to the front and rear wheels of the vehicle 60. During vehicle simulation, tires 62 are placed on the two rollers that constitute the roller pairs 20.

[0075] In each roller device 2 , except for a portion of the roller pair 20 (the top portion exposed from the floor 10 ), the roller rotating mechanism 21 , the roller supporting mechanism 22 , the moving guide rail 23 , and the supporting base 24 are all arranged below the floor 10 .

[0076] On the floor surface 10, a total of four vehicle holding mechanisms 3 are provided between the two front roller devices 2 and the two rear roller devices 2. The four vehicle holding mechanisms 3 are provided on the floor surface 10 to fix the vehicle 60. Figure 1 Schematically illustrates the vehicle holding mechanism 3 , which is different from the actual structure of the vehicle holding mechanism 3 .

[0077] Furthermore, an engine cooling fan 6 is provided below the floor surface 10 and in front of the center portion of the four roller devices 2. The engine cooling fan 6 generates airflow through the cooling openings 16 provided in the floor surface 10 toward the vehicle 60, which is mounted on the four roller pairs 20 and has four tires 62.

[0078] Figure 2 as well as Figure 3 It is an explanatory diagram schematically showing the planar configuration of the chassis dynamometer system 1 . Figure 2 The planar configuration of the vehicle 60 before being fixed is shown. Figure 3 The planar structure of the vehicle 60 after being fixed is shown. Figure 2 as well as Figure 3 The XYZ orthogonal coordinate system is shown in FIG. Figure 2 as well as Figure 3 The engine cooling fan 6 and the cooling opening 16 are omitted from illustration.

[0079] like Figure 2 As shown, four vehicle gripping mechanisms 3 are arranged corresponding to four roller devices 2. Figure 2 as well as Figure 3 In FIG. 1 , the four vehicle control mechanisms 3 are classified and expressed as a vehicle control mechanism 3FL, a vehicle control mechanism 3FR, a vehicle control mechanism 3BL, and a vehicle control mechanism 3BR according to their arrangement positions.

[0080] The two vehicle holding mechanisms 3FL and 3BL are classified as one vehicle holding mechanism, provided corresponding to the left side (-X side; one side) of the vehicle 60, and the two vehicle holding mechanisms 3FR and 3BR are classified as the other vehicle holding mechanism, provided corresponding to the right side (+X side; the other side) of the vehicle 60. In other words, the four (=2n (n=2)) vehicle holding mechanisms 3 are classified as two one vehicle holding mechanisms and two other vehicle holding mechanisms.

[0081] like Figure 2 As shown, the vehicle holding mechanism 3FL is arranged close to the rear (-Y direction) of the front (+Y direction) and left (-X side) roller device 2, and the vehicle holding mechanism 3FR is arranged close to the rear of the front and right (+X side) roller device 2. Furthermore, the vehicle holding mechanism 3BL is arranged close to the front of the rear and left roller device 2, and the vehicle holding mechanism 3BR is arranged close to the front of the rear and right roller device 2.

[0082] like Figure 2 as well as Figure 3As shown, each vehicle gripping mechanism 3 includes an iron plate 30 serving as a base as a component. The gripping body of the vehicle gripping mechanism 3 is positioned and arranged on the iron plate 30.

[0083] like Figure 3 As shown, the vehicle 60 has rockers 61 on both sides. The rockers 61 are plate-shaped outer frame portions of the vehicle body that exist at the lower edge of the vehicle body (below the doors) and are also called "side sills."

[0084] exist Figure 3 In FIG. 1 , the two door sills 61 are classified and expressed as a door sill 61L on the left side and a door sill 61 on the right side and expressed as a door sill 61R on the right side.

[0085] like Figure 3 As shown, the front lower end of the door sill 61L is held by the vehicle holding mechanism 3FL, and the rear lower end of the door sill 61L is held by the vehicle holding mechanism 3BL. Similarly, the front lower end of the door sill 61R is held by the vehicle holding mechanism 3FR, and the rear lower end of the door sill 61L is held by the vehicle holding mechanism 3BR.

[0086] Figure 4 as well as Figure 5 It is an explanatory diagram schematically showing the detailed structure of the vehicle gripping mechanism 3 . Figure 4 The planar structure of the vehicle holding mechanism 3 is shown. Figure 5 Shown Figure 4 The A-A section structure. In addition, Figure 4 as well as Figure 5 The XYZ orthogonal coordinate system is shown. In addition, the XYZ orthogonal coordinate system shows the vehicle gripping mechanism 3FL as an object. In addition, the internal structure of each of the four vehicle gripping mechanisms 3 is the same.

[0087] As shown in these figures, the vehicle gripping mechanism 3 includes an iron plate 30, a base 32, an arm 33, a clamping portion 34, and a pressing plate 35 as main components. The combination of the base 32, the arm 33, and the clamping portion 34 constitutes the gripping body of the vehicle gripping mechanism 3.

[0088] The iron plate 30 functions as a base for arranging the holding body structure. Figure 5 As shown, surface 30a is of planar configuration.

[0089] Base 32 in Figure 4 The base installation area 30 r indicated by the dotted line is arranged on the surface 30 a inside the iron plate 30 .

[0090] The arm 33 is in the shape of a rod.

[0091] The base 32 rotatably supports one end portion of the arm 33. An arm shaft portion 33g is provided on one end portion of the arm 33.

[0092] Figure 6 It is an explanatory diagram showing the cross-sectional structure of the arm shaft portion 33g of the arm 33.

[0093] like Figure 6 As shown, in the arm shaft portion 33g, a pin insertion space 333 is provided at the center along the inner peripheral surface of the iron pipe 331.

[0094] The base 32 and the arm 33 are connected by inserting the arm fixing pin 43 into the pin insertion space 333 of the arm shaft portion 33 g of the base 32 .

[0095] Hereinafter, in this specification, the combined structure of the base 32 and the arm 33 in a state of being connected to each other is referred to as a "base-arm combination."

[0096] The two pressing plates 35 extend in the Y direction across both sides (±X direction sides relative to the base 32) of the base 32 to fix the base 32 to the iron plate 30. The two pressing plates 35 are fixed to the iron plate 30 at both ends in the Y direction by bolts 46.

[0097] The two pressing plates 35 are provided on the iron plate 30 , so that the base 32 is fixed to the iron plate 30 .

[0098] As a result, in the base-arm combination, the arm 33 can rotate about the arm fixing pin 43 of the base 32 as a rotation axis.

[0099] Multiple screw-fastening openings 41 are provided along the X direction in the end region on the -Y direction side of the iron plate 30. One end (on the -Y direction side) of a bolt 46 is screwed into one of the multiple screw-fastening openings 41. Similarly, multiple screw-fastening openings (not shown) are provided along the X direction in the region on the +Y direction side of the iron plate 30. The other end (on the +Y direction side) of a bolt 46 is screwed into one of the multiple screw-fastening openings.

[0100] The clamping portion 34 is connected to the arm 33 in a front end region on the other end side of the arm 33 .

[0101] Figure 7 as well as Figure 8 It is an explanatory diagram showing the clamping portion 34 and its surrounding structure in detail. Figure 7 Equivalent to Figure 4 The enlarged image of Figure 8 Equivalent to Figure 5 Magnified image of .

[0102] like Figure 7 as well as Figure 8 As shown, the clamping portion 34 includes a clamping body portion 34m and a connecting portion 34e that are integrated with each other, and the connecting portion 34e is provided below the central region of the clamping body portion 34m.

[0103] like Figure 7 As shown, the clamping body 34m of the clamping portion 34 includes a pair of elastic plates 52A and 52B facing each other with a gripping space 53 therebetween, the gripping space 53, and a pair of iron plates 51A and 51B facing each other with the elastic plates 52A and 52B therebetween.

[0104] In the clamping body 34m, the iron plate 51A and the elastic plate 52A are connected so that their YZ planes are in close contact with each other, and the iron plate 51B and the elastic plate 52B are connected so that their YZ planes are in close contact with each other. As the constituent material of each of the elastic plates 52A and 52B, for example, rubber having the following properties can be considered: elasticity, relative softness, and a relatively high coefficient of friction.

[0105] Two bolts 44 are installed below the clamping body 34m (in the -Z direction) and penetrate the elastic plates 52A and 52B in the X direction to fasten and fix the elastic plates 52A and 52B. The two bolts 44 function as fixing members that apply a pressing force in the direction of narrowing the gripping space 53.

[0106] The connection portion 34e of the clamp portion 34 is fixed to the arm 33 by a clamp fixing bolt 45. Specifically, the clamp fixing bolt 45 is installed through the connection portion 34e in the X direction. The clamp portion 34 and the arm 33 are fixedly connected by the clamp fixing bolt 45.

[0107] Furthermore, as the arm 33, it is preferable to prepare in advance a plurality of arms 33 having different lengths in the Y direction as needed. Figure 4 as well as Figure 5 As shown by the dotted line in FIG. 3 , by using the longitudinal arm 33X having a longer length in the Y direction, it is possible to obtain the vehicle gripping mechanism 3 that is suitable for the wheel base of the vehicle 60 relatively easily.

[0108] Figure 9 1 is a flowchart showing a processing procedure of a method for fixing a vehicle 60 using the vehicle gripping mechanism 3 in the chassis dynamometer system 1 of the present embodiment.

[0109] Note that the preparation state before step S1 is a state in which only four iron plates 30 are arranged on the floor surface 10 in correspondence with the four roller devices 2 .

[0110] First, in step S1 , the single-piece clamping portion 34 is attached to the rocker 61 of the vehicle 60 .

[0111] The rocker 61 of the vehicle 60 is in a plate shape having a YZ plane, with at least the lower end thereof protruding. On the other hand, the clamping portion 34 is in a single state before being connected to the arm 33, and the bolt 44 is not attached.

[0112] Therefore, by inserting the lower end of the door sill 61 into the holding space 53 of the single clamping portion 34, the single clamping portion 34 can be temporarily attached to the door sill 61 by utilizing the friction between the elastic plates 52A and 52B and the lower end of the door sill 61. In addition, the thickness of the holding space 53 of the clamping portion 34 is set to a thickness that allows the clamping portion 34 to be attached to the door sill 61 by utilizing the friction force mentioned above.

[0113] At this time, the clamping portion 34 for the vehicle holding mechanism 3FL is temporarily attached to the front lower end of the left side sill 61L, and the clamping portion 34 for the vehicle holding mechanism 3BL is temporarily attached to the rear lower end of the side sill 61L. Similarly, the clamping portion 34 for the vehicle holding mechanism 3FR is temporarily attached to the front lower end of the right side sill 61R, and the clamping portion 34 for the vehicle holding mechanism 3BR is temporarily attached to the rear lower end of the side sill 61R.

[0114] Next, each clamping portion 34 is fixed to the lower end of the door sill 61. Specifically, two bolts 44 are installed through the elastic plates 52A and 52B of the clamping body 34m to fasten the elastic plates 52A and 52B. The fastening of the two bolts 44, which serve as the fixing means, exerts a pressing force that narrows the gripping space 53 between the elastic plates 52A and 52B.

[0115] As a result, the lower end of the door sill 61 is firmly fixed to the door sill 61 of the vehicle 60 by the friction force generated between the elastic plates 52A and 52B and the above-mentioned pressing force acting in the direction of narrowing the holding space 53 without having a negative impact on the door sill 61.

[0116] Specifically, the clamping portion 34 for the vehicle holding mechanism 3FL is fixed to the front lower end of the left side sill 61L, and the clamping portion 34 for the vehicle holding mechanism 3BL is fixed to the rear lower end of the side sill 61L. Similarly, the clamping portion 34 for the vehicle holding mechanism 3FR is fixed to the front lower end of the right side sill 61R, and the clamping portion 34 for the vehicle holding mechanism 3BR is fixed to the rear lower end of the side sill 61R.

[0117] In this manner, only the four clamping portions 34 of the rocker 61 ( 61L and 61R) are attached to the vehicle 60 .

[0118] Next, as shown in step S2 , the vehicle 60 is arranged so that the four tires 62 are positioned on the roller pairs 20 of the four roller devices 2 .

[0119] In addition, the execution order of step S1 and step S2 can also be reversed. Figure 9 The sequence of steps S1 and S2 shown can relatively easily mount the four clamping parts 34 on the rocker 61 of the vehicle 60 .

[0120] Next, in step S3 , the base-arm combination is arranged corresponding to the clamping portion 34 .

[0121] In step S3 , the base 32 is positioned in the base installation region 30 r of the iron plate 30 so that the distal end region of the arm 33 can be connected to the connection portion 34 e of the clamp portion 34 by the clamp fixing bolt 45 .

[0122] As a result, the base-arm combination is arranged on the iron plate 30 so that the clamping portion 34 and the distal end region of the arm 33 overlap when viewed in plan on the XY plane.

[0123] Thereafter, in step S4 , two pressing plates 35 are provided so as to straddle both ends of the base 32 , and both ends of the two pressing plates 35 are fixed to the iron plate 30 by bolts 46 .

[0124] As a result, the base-arm assembly is fixed to the iron plate 30. At this point, the arm 33 can rotate about the arm-fixing pin 43 while the base 32 is fixed to the iron plate 30. Therefore, the base 32 supports the arm 33 with the arm-fixing pin 43 located at one end of the arm 33 serving as the rotation axis.

[0125] Finally, in step S5 , the clamping portion 34 is fixed to the base-arm combination.

[0126] That is, the clamping and fixing bolts 45 that penetrate the connecting portion 34e in the X direction are attached.

[0127] As a result, the four vehicle holding mechanisms 3 are completed in a state where the clamping portion 34 is connected to the arm 33 of the base arm assembly by the clamping fixing bolts 45 and the four vehicle holding mechanisms 3 are respectively fixed to the door sills 61 .

[0128] Furthermore, the clamp portion 34 is connected to the arm 33 in a state of being fixed by the clamp fixing bolts 45 .

[0129] In addition, all of the four vehicle gripping mechanisms 3 , except for the upper portion of the clamping body portion 34 m that clamps the lower end portion of the rocker 61 , are located below the bottom portion of the vehicle body 60 .

[0130] By executing steps S1 to S5 in this manner, the chassis dynamometer system 1 in which the vehicle 60 is fixed by the four vehicle gripping mechanisms 3 can be completed with the four tires 62 placed on the four roller pairs 20 of the roller device 2 .

[0131] Figure 10 : is a perspective view schematically showing the structure of the chassis dynamometer system 1 after the vehicle 60 is fixed. Figure 10 The XYZ orthogonal coordinate system is shown in FIG. Figure 10 In FIG. 1 , for convenience of explanation, the engine cooling fan 6 and the four vehicle gripping mechanisms 3 are omitted from illustration.

[0132] like Figure 10 As shown, four tires 62 of a vehicle 60 are placed on two rollers of the roller pairs 20 of the four roller devices 2. As described above, the vehicle 60 utilizes Figure 10 Four vehicle holding mechanisms 3 not shown in the figure are fixed.

[0133] In addition, if Figure 10 As shown, an exhaust hose 7 is provided, one end of which is connected to the rear portion of the vehicle 60. One end of the exhaust hose 7 serves as an input port, and the other end serves as an output port. The input port (one end) receives exhaust gas discharged from the vehicle 60, and the output port (the other end) outputs the exhaust gas to the outside.

[0134] In chassis dynamometer system 1, the other end of exhaust hose 7 is positioned beneath floor panel 10. Floor panel 10 has a position adjustment function for adjusting the position of a hose hole that guides exhaust hose 7 beneath floor panel 10. Therefore, the position of the hose hole can be adjusted according to the size of vehicle 60, the location of the exhaust gas outlet, and other factors.

[0135] Alternatively, instead of the above-described position adjustment function, a plurality of hose holes may be provided in advance on the floor surface 10 , and a hole suitable for the vehicle 60 to be tested may be appropriately selected from among the plurality of hose holes.

[0136] Furthermore, a rectangular image simulator 12 having its longitudinal direction in the X direction and its transverse direction in the Z direction is provided on the floor surface 10 in front of the vehicle 60 (in the +Y direction). The image simulator 12, serving as a simulation auxiliary component, has a display function for displaying the entire scene visible from the vehicle 60.

[0137] Furthermore, an object simulator 11 is provided on the floor surface 10 in front of the center of the vehicle 60. The object simulator 11 is arranged in front of the image simulator 12 (in the +Y direction) relative to the vehicle 60. The object simulator 11, as a simulation auxiliary component, simulates the movement of an object.

[0138] Figure 11This is a block diagram showing the configuration of a control system for vehicle simulation executed by the chassis dynamometer system 1 with the vehicle 60 fixed.

[0139] As shown in the figure, there are a generator control device 75 and an ADAS test control device 77 as control devices that execute vehicle simulation.

[0140] Furthermore, “ADAS (Advanced Driver Assistance System)” means “Advanced Driving System” and is a system that senses the possibility of accidents in advance and avoids them.

[0141] A dynamometer detector 71 as a rotation detector is mounted on each roller device 2 to detect the rotation state of two rollers in the roller pair 20 and output a rotation pulse signal S71 as a rotation detection signal. A pulse generator (PLG) is used as the dynamometer detector 71, for example.

[0142] The vehicle 60 is equipped with a steering detector 72, which detects the steering state (steering angle A60) of the driver of the vehicle 60 and outputs a steering detection signal S60. As the steering detector 72, for example, a pulse generator is used.

[0143] Alternatively, the steering detection signal S60 may be outputted using a vehicle ECU (Electronic Control Unit) 73 instead of the steering detector 72. When the vehicle ECU 73 is used, the steering detection signal S60 is outputted using CAN (Control Area Network) communication.

[0144] The vehicle 60 further includes an external sensor 74. The external sensor 74 includes radar and laser radar (LiDAR) used as a corner sensor, and side cameras (side electronic mirrors).

[0145] The external sensor 74 senses external information and outputs external sensing information S74 indicating the sensed external information. The external information includes, for example, sensing information of the target simulator 11, distance information from the target simulator 11, and vehicle side information recognized by the side camera.

[0146] The generator control device 75 receives the rotation pulse signal S71 and the direction detection signal S60. The generator control device 75 calculates the speed (km / s) and acceleration (m / s) of the vehicle 60 based on the rotation pulse signal S71. 2 ), and outputs a speed signal SV indicating the vehicle speed and vehicle acceleration to the ADAS test control device 77.

[0147] Furthermore, based on the steering detection signal S60, the generator control device 75 outputs a steering angle signal SG indicating the steering angle of the four tires 62 to the ADAS test control device 77 and the motor driver device 78. The steering angle signal SG is obtained based on the steering information indicated by the steering detection signal S60, taking into account the rotation accuracy and rotation response accuracy of the roller rotation mechanism 21.

[0148] In addition, the transmission of the rotation pulse signal S71, the steering detection signal S60, the external sensing information S74, the speed signal SV, the steering angle signal SG, etc. is performed using a wired or wireless communication function.

[0149] Based on the speed signal SV, the steering angle signal SG, and the external sensor information S74, the ADAS test control device 77 controls the image simulator 12 and the target simulator 11 to execute a vehicle simulation. Specifically, the ADAS test control device 77 controls the display content of the entire scene visible from the vehicle 60 on the image simulator 12 and controls the display content of the target simulator 11. Furthermore, during the vehicle simulation, the target simulator 11 can be visually recognized from the vehicle 60 through the image simulator 12.

[0150] In this manner, the object simulator 11 and the image simulator 12 function as simulation auxiliary components in the vehicle simulation executed under the control of the ADAS test control device 77 , and are arranged in front of the vehicle 60 on the floor surface 10 .

[0151] On the other hand, the motor driver 78 outputs a drive control signal S78 to the roller rotating motor 21m based on the steering angle signal SG. The roller rotating motor 21m rotates the roller rotating mechanism 21 in the roller rotating direction R2 based on the drive control signal S78. As a result, the roller pair 20 of the roller rotating mechanism 21 rotates in the roller rotating direction R2 in accordance with the steering state of the vehicle 60 (steering angle A60).

[0152] Therefore, the vehicle simulation of the chassis dynamometer system 1 includes a control process of the roller turning mechanism 21 based on the steering detection signal S60 .

[0153] In this manner, the vehicle simulation for the vehicle 60 can be executed under the control of the generator control device 75 and the ADAS test control device 77. Therefore, the generator control device 75 and the ADAS test control device 77 function as control devices for vehicle simulation.

[0154] When executing the vehicle simulation, the vehicle 60 is fixed by the four vehicle gripping mechanisms 3 .

[0155] At this time, the arm 33 can rotate about the arm fixing pin 43. Therefore, by the rotation of the arm 33, the four vehicle gripping mechanisms 3 can follow the posture of the vehicle 60 and fix the vehicle 60 with high stability.

[0156] Specifically, during the vehicle simulation, the vehicle 60 tends to tilt up and down while the vehicle 60 is being driven (particularly during acceleration and deceleration).

[0157] (Effect)

[0158] The chassis dynamometer system 1 according to the embodiment mainly includes the following components (a) to (c).

[0159] (a) The support mechanism of the vehicle 60 includes a roller device 2 having a roller rotating mechanism 21 and is provided under the floor surface 10 .

[0160] (b) A fixing mechanism for the vehicle 60 , which includes the vehicle holding mechanism 3 .

[0161] (c) A simulation execution unit that controls the target simulator 11 , the image simulator 12 , and the roller turning mechanism 21 under the control of the generator control device 75 and the ADAS test control device 77 to execute a vehicle simulation.

[0162] Furthermore, as described above, the chassis dynamometer system 1 of the embodiment mainly has the following features (1) to (6).

[0163] (1) The dynamometer detector 71 serving as the rotation detection unit detects the rotation state of the roller pair 20 and obtains a rotation pulse signal S71 as a rotation detection signal.

[0164] (2) The steering detector 72 detects the steering state of the vehicle 60 and obtains a steering detection signal S60.

[0165] (3) The generator control device 75 and the ADAS test control device 77 control the target simulator 11 and the image simulator 12 as simulation auxiliary components based on the rotation pulse signal S71, the steering detection signal S60, and the external sensing information S74 to perform vehicle simulation.

[0166] (4) Each roller device 2 includes a roller rotating mechanism 21 that supports the roller pair 20 so as to be rotatable.

[0167] (5) Most of the four vehicle gripping mechanisms 3 that secure the vehicle 60 are disposed below the bottom portion of the vehicle body 60 .

[0168] (6) As part of the vehicle simulation, a control process for rotating the roller rotating mechanism 21 in the roller rotating direction R2 based on the steering detection signal S60 under the control of the generator control device 75 is executed.

[0169] The chassis dynamometer system 1 of this embodiment performs a vehicle simulation including a process of rotating the roller rotating mechanism 21 based on the steering detection signal S60 under control of the generator control device 75 serving as a control device based on the steering angle signal SG (the above-mentioned feature (6)).

[0170] Therefore, the chassis dynamometer system 1 of the present embodiment can execute various vehicle simulations including steering operations other than straight driving.

[0171] Therefore, compared with a vehicle simulation in which the angle of the tire 62 relative to the roller pair 20 is detected, a vehicle simulation with a higher response speed can be executed.

[0172] In addition, since most of the four vehicle control mechanisms 3 in the chassis dynamometer system 1 are arranged below the bottom of the vehicle body 60 (the above-mentioned feature (5)), there will be no situation where the four vehicle control mechanisms 3 exist in the detection range of the external sensor 74 and the four vehicle control mechanisms 3 hinder the field of view recognition of the target simulator 11 and the image simulator 12.

[0173] As a result, the chassis dynamometer system 1 of the present embodiment can secure the vehicle 60 with high stability using the four vehicle gripping mechanisms 3 and can perform vehicle simulation with high accuracy.

[0174] In the chassis dynamometer system 1 of this embodiment, the lower ends of the door sills 61 (61L, 61R) on both sides of the vehicle 60 are held in a well-balanced manner by using the clamping portions 34 of each of the two vehicle holding mechanisms on one side (vehicle holding mechanisms 3FL and 3BL) and the clamping portions 34 of each of the two vehicle holding mechanisms on the other side (vehicle holding mechanisms 3FR and 3BR).

[0175] As a result, the chassis dynamometer system 1 of the present embodiment can secure the vehicle 60 with good balance through the gripping operations of the four vehicle gripping mechanisms 3 .

[0176] The lower end of the door sill 61 located in the holding space 53 is held by the clamping portion 34 of each of the four vehicle holding mechanisms 3 by being clamped by a pair of elastic plates 52A and 52B, and a pressing force is applied in the direction of narrowing the holding space 53 by two bolts 44 serving as fixing components.

[0177] Therefore, the chassis dynamometer system 1 of this embodiment utilizes the friction force of the elastic plates 52A and 52B and the pressing force of the two bolts 44 to grip the lower end of the rocker 61 of the vehicle 60 with the clamping portion 34 at a total of four positions to secure the vehicle 60 with good stability.

[0178] As a result, the chassis dynamometer system 1 of the present embodiment can execute vehicle simulation with high accuracy.

[0179] The other end of the exhaust hose 7 of the chassis dynamometer system 1 of this embodiment is disposed below the floor surface 10 . Therefore, the exhaust hose 7 can be minimized on the floor surface 10 and disposed in a blind spot of the external sensor 74 .

[0180] As a result, the chassis dynamometer system 1 of the present embodiment can output the exhaust gas of the vehicle 60 to the outside through the exhaust hose 7 and can perform vehicle simulation with high accuracy.

[0181] The chassis dynamometer system 1 of this embodiment has the engine cooling fan 6 disposed below the floor surface 10. Therefore, the engine cooling fan 6 does not fall within the detection range of the external sensor 74, nor does the presence of the engine cooling fan 6 obstruct the field of view of the target simulator 11 or the image simulator 12.

[0182] As a result, the chassis dynamometer system 1 of the present embodiment can cool the vehicle 60 using the engine cooling fan 6 and perform vehicle simulation with high accuracy.

[0183] (other)

[0184] While the chassis dynamometer system 1 of this embodiment utilizes four vehicle gripping mechanisms 3, each consisting of two one-side vehicle gripping mechanisms and two other-side vehicle gripping mechanisms, the system is not limited thereto. Specifically, any chassis dynamometer system having 2n vehicle gripping mechanisms 3, each consisting of n (≥1) one-side vehicle gripping mechanisms and n other-side vehicle gripping mechanisms, will suffice.

[0185] In addition, the present disclosure can appropriately modify or omit the embodiments within the scope of the disclosure.

Claims

1. A chassis dynamometer system capable of performing vehicle simulation on a floor surface, the chassis dynamometer system comprising: a roller device having a roller for carrying a tire of a vehicle; A vehicle holding mechanism is provided on the floor surface to fix the vehicle; a rotation detection unit for detecting a rotation state of the roller to obtain a rotation detection signal; a steering detector for detecting a steering state of the vehicle and obtaining a steering detection signal; a simulation auxiliary component, arranged on the floor surface in front of the vehicle; as well as a control device that controls the simulation auxiliary component to execute the vehicle simulation based on the rotation detection signal and the steering detection signal; The roller device includes a roller rotating mechanism, which is provided under the floor surface and supports the roller so as to be capable of rotating. The vehicle holding mechanism is arranged below the bottom of the vehicle body. The vehicle simulation includes a control process of the roller turning mechanism based on the steering detection signal. The vehicle holding mechanism includes 2n vehicle holding mechanisms, wherein n≥1, The 2n vehicle control mechanisms are classified into n one-side vehicle control mechanisms and n other-side vehicle control mechanisms. Each of the n one-vehicle holding mechanisms includes a clamping portion for clamping and holding a lower end portion of a door sill on one side surface of the vehicle. Each of the n other vehicle holding mechanisms includes a clamping portion for clamping and holding a lower end portion of a door sill on the other side surface of the vehicle that is opposite to the one side surface. The 2n vehicle holding mechanisms respectively include: the clamping portion; an arm connected to the clamping portion; and a base supporting the arm so as to be rotatable with one end portion of the arm serving as a rotation axis, The clamping portion comprises: a pair of elastic plates facing each other across a holding space; and A fixing component is used to fix the pair of elastic plates. The lower end portion of the door sill located in the holding space is held by being sandwiched between the pair of elastic plates and is pressed by the fixing member in a direction of narrowing the holding space. The base is fixed to an iron plate arranged on the floor surface. The arm is capable of rotating about one end portion as a rotation axis.

2. The chassis dynamometer system according to claim 1, characterized in that: It also includes an exhaust hose having one end connected to the rear portion of the vehicle, One end of the exhaust hose serves as an input port, and the other end serves as an output port. The input port receives exhaust gas discharged from the vehicle, and the output port outputs the exhaust gas to the outside. The other end of the exhaust hose is arranged under the floor surface.

3. The chassis dynamometer system according to claim 1 or 2, characterized in that: A cooling fan is also provided under the floor surface. The cooling fan performs an air blowing operation to form an air flow toward the vehicle through a cooling opening provided in the floor surface.

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