Vehicle vibration excitation method and vehicle vibration excitation device

Abstract

Provided is a vehicle excitation method suitable for a test simulating a rolling road. The vehicle excitation method includes an initial height setting step (S71) of setting an interval d between a front axle 7 and a rear axle 8 in a front-rear direction to a certain initial setting interval s and setting a vehicle wheel at a certain initial setting height Hi, an excitation step (S72) of performing excitation by at least one of a raising operation step of making the interval d narrower than the initial setting interval s and raising the vehicle wheel from the initial setting height Hi and a lowering operation step of making the interval d wider than the initial setting interval s and lowering the vehicle wheel from the initial setting height Hi, and a recovery step (S73) of recovering the interval d to the initial setting interval s.

Description

Technical Field

[0001] This invention relates to a vibration excitation method and a vibration excitation device for vehicles. Background Technology

[0002] A vehicle vibration excitation method is known for obtaining various characteristic data of a vehicle under test related to vibration. As an example, a vehicle vibration excitation method has been proposed (e.g., see Patent Document 1), which uses a front axle and a rear axle extending in the left-right direction to clamp each wheel of the vehicle in the front-rear direction, and moves the front axle in the front-rear horizontal direction to excite the wheel in the front-rear vertical direction. Another vehicle vibration excitation method has been proposed, which uses a roller with concave and convex grooves to excite the tire to simulate driving vibration (e.g., see Patent Document 2).

[0003] [Previous Technical Documents]

[0004] (Patent Documents)

[0005] Patent Document 1: International Publication No. 2020 / 218251

[0006] Patent Document 2: Japanese Patent Application Publication No. 2017-9545 Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] On the other hand, sometimes tests related to the vehicle characteristics on the spring are conducted on the vehicle under test on undulating roads, but the vehicle excitation methods in Patent Documents 1 and 2 cannot make the wheels lift or sink, which is not suitable for simulating tests on undulating roads.

[0009] The present invention was made in view of the above circumstances, and its object is to provide a vehicle excitation method and a vehicle excitation device suitable for conducting tests simulating the characteristics of a vehicle on a undulating road.

[0010] [Technical means to solve the problem]

[0011] (1) A vehicle vibration method using a vibration device (e.g., vehicle vibration device 1 described later), the vibration device using a front axle (e.g., front axle 7 described later) and a rear axle (e.g., rear axle 8 described later) extending in the left-right direction to clamp the wheel of a vehicle to be inspected (e.g., vehicle 2 described later) in the front-rear direction, and moving at least one of the aforementioned front axle and rear axle (e.g., front axle 7 described later) in the front-rear horizontal direction, thereby vibrating the wheel in the front-rear vertical direction, wherein the vehicle vibration method includes the following steps: an initial height setting step (e.g., step S71 described later), setting the distance between the aforementioned front axle and rear axle in the front-rear direction (e.g., axle spacing d described later) to a specific initial setting distance (e.g. For example, the initial setting interval (s) described later, and setting the wheel at a specific initial setting height (e.g., the initial setting height Hi described later); the excitation step (e.g., step S72 described later), which excites the wheel by at least one of the rising operation step and the falling operation step, wherein the rising operation step is to make the distance between the front axle and the rear axle in the front-rear direction narrower than the initial setting interval and to raise the wheel from the initial setting height, and the falling operation step is to make the distance between the front axle and the rear axle in the front-rear direction wider than the initial setting interval and to lower the wheel from the initial setting height; and the recovery step, which restores the distance between the front axle and the rear axle in the front-rear direction to the initial setting interval.

[0012] (2) A vehicle vibration method using a vibration device (e.g., vehicle vibration device 1 described later), the vibration device using a front axle (e.g., front axle 7 described later) and a rear axle (e.g., rear axle 8 described later) extending in the left-right direction to clamp the wheels of a vehicle to be inspected (e.g., vehicle 2 described later) in the front-rear direction, and moving at least one of the aforementioned front axle and rear axle (e.g., front axle 7 described later) in the front-rear horizontal direction, thereby vibrating the wheels in the front-rear vertical direction, wherein the vehicle vibration method includes the following steps: an initial height setting step (e.g., step S81 described later), setting the distance between the aforementioned front axle and rear axle in the front-rear direction to... A specific initial setting interval is set, and the aforementioned wheel is set at a specific initial setting height; and, the excitation step (e.g., step S84 described later: "No" → step S82 → step S83) alternately repeats the rising operation step (e.g., step S82 described later) and the falling operation step (e.g., step S83 described later), wherein the rising operation step is to make the distance between the aforementioned front axle and rear axle in the front-rear direction narrower than the aforementioned initial setting interval, and to raise the aforementioned wheel from the aforementioned initial setting height, and the falling operation step is to make the distance between the aforementioned front axle and rear axle in the front-rear direction wider than the aforementioned initial setting interval, and to lower the aforementioned wheel from the aforementioned initial setting height.

[0013] (3) A vehicle vibration method using a vibration device (e.g., vehicle vibration device 1 described later), wherein the vibration device uses a front axle (e.g., front axle 7 described later) and a rear axle (e.g., rear axle 8 described later) extending in the left-right direction to clamp the front wheel and rear wheel of a vehicle to be inspected (e.g., vehicle 2 described later) in the front-rear direction, thereby moving at least one of the aforementioned front axle and rear axle (e.g., front axle 7 described later) in the front-rear horizontal direction, thereby vibrating the wheel in the front-rear vertical direction, wherein the vehicle vibration method includes the following steps: a front and rear wheel initial height setting step (e.g., step S91 described later), setting the distance between the aforementioned front axle and rear axle in the front-rear direction to a specific initial setting distance, and setting the aforementioned front wheel and rear wheel... Each wheel is set to a specific initial height; and, in the excitation step (e.g., step S94 described later: "No" → step S95 → step S92 → step S93), one wheel raising operation step (e.g., step S92 described later) and another wheel lowering operation step (e.g., step S93 described later) are alternately repeated, wherein one wheel raising operation step is to make the distance between the aforementioned front axle and rear axle in the front-rear direction narrower than the aforementioned initial set distance, and to raise one of the aforementioned front wheel and rear wheel from the aforementioned initial set height, and the other wheel lowering operation step is to make the distance between the aforementioned front axle and rear axle in the front-rear direction wider than the aforementioned initial set distance, and to lower the other of the aforementioned front wheel and rear wheel from the aforementioned initial set height.

[0014] (4) According to any of the vehicle excitation methods in (1) to (3) above, at least one of the aforementioned front axle and rear axle is moved in the front-rear horizontal direction, so that the aforementioned excitation step is performed while the wheel is excited in the front-rear vertical direction.

[0015] (5) A vehicle vibration device (e.g., vehicle vibration device 1 described later) clamps each wheel of a vehicle to be inspected (e.g., vehicle 2 described later) in the longitudinal direction using a front axle (e.g., front axle 7 described later) and a rear axle (e.g., rear axle 8 described later) extending in the left-right direction, and moves the aforementioned front axle in the longitudinal horizontal direction, thereby vibrating the wheels in the longitudinal vertical direction, wherein the vehicle vibration device comprises: a moving mechanism (e.g., moving mechanism 10 described later), including an actuator (e.g., actuator 9 described later) for moving the aforementioned front axle in the longitudinal horizontal direction, operating under the control of a specific control unit (e.g., control unit 11 described later), and moving the aforementioned front axle; the aforementioned control unit controls the aforementioned moving mechanism to perform the following operation: an initial height setting operation (e.g., performing step S7 described later). The operation of step 1) sets the distance between the front axle and the rear axle in the longitudinal direction to a specific initial set distance and sets the wheel at a specific initial set height; the excitation operation (e.g., performing the operation of step S72 described later) uses at least one of the lifting operation and the lowering operation to excite, wherein the lifting operation is to make the distance between the front axle and the rear axle in the longitudinal direction narrower than the initial set distance and raise the wheel from the initial set height, and the lowering operation is to make the distance between the front axle and the rear axle in the longitudinal direction wider than the initial set distance and lower the wheel from the initial set height; and the recovery operation (e.g., performing the operation of step S73 described later) restores the distance between the front axle and the rear axle in the longitudinal direction to the initial set distance.

[0016] (The effect of the invention)

[0017] In the vehicle excitation method of (1), in the initial height setting step, the distance between the front axle and the rear axle in the longitudinal direction is set to a specific initial setting distance, and the wheel is set to a specific initial setting height; in the excitation step, excitation is performed by at least one of the rising operation step and the falling operation step, wherein the rising operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction narrower than the initial setting distance and raising the wheel from the initial setting height, and the falling operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction wider than the initial setting distance and lowering the wheel from the initial setting height. Thus, the vehicle can be excited while the vehicle position is raised and lowered, so as to conduct a test simulating the vehicle characteristics on the spring on an undulating road.

[0018] In the vehicle excitation method of (2), in the initial height setting step, the distance between the front axle and the rear axle in the longitudinal direction is set to a specific initial set distance, and the wheels are set to a specific initial set height. In the excitation step, the rising operation step and the falling operation step are repeated alternately. The rising operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction narrower than the initial set distance and raising the wheels from the initial set height. The falling operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction wider than the initial set distance and lowering the wheels from the initial set height. Thus, the vehicle can be excited while raising and lowering its position to conduct a test simulating the characteristics of a vehicle on a spring on an undulating road.

[0019] In the vehicle excitation method of (3), in the initial height setting step for the front and rear wheels, the distance between the front and rear axles in the longitudinal direction is set to a specific initial setting distance, and the aforementioned front and rear wheels are respectively set to specific initial setting heights. In the excitation step, the rising operation step and the falling operation step are repeated alternately. The rising operation step is the step of making the distance between the front and rear axles in the longitudinal direction narrower than the initial setting distance and raising one of the front and rear wheels from the initial setting height. The falling operation step is the step of making the distance between the front and rear axles in the longitudinal direction wider than the initial setting distance and lowering the other of the front and rear wheels from the initial setting height. Thus, the vehicle can be excited while raising and lowering its position to conduct tests simulating the characteristics of a vehicle on a spring on an undulating road.

[0020] In the vehicle excitation method of (4), at least one of the front axle and the rear axle is moved in the front-rear horizontal direction, so that the wheel is excited in the front-rear vertical direction while the excitation step is performed, thereby enabling the test to simulate the virtual driving state of the vehicle on the undulating road with a frequency superimposed with a higher frequency.

[0021] In the vehicle excitation device of (5), during the initial height setting operation performed by the control unit, the distance between the front axle and the rear axle in the longitudinal direction is set to a specific initial set distance, and the wheels are set at a specific initial set height. During the excitation operation, excitation is performed using at least one of an upward operation and a downward operation. The upward operation is an operation that narrows the distance between the front axle and the rear axle in the longitudinal direction compared to the initial set distance and raises the wheels from the initial set height. The downward operation is an operation that widens the distance between the front axle and the rear axle in the longitudinal direction compared to the initial set distance and lowers the wheels from the initial set height. Thus, the vehicle can be excited while its position is raised and lowered to conduct tests simulating the characteristics of a vehicle on a spring on an undulating road. Attached Figure Description

[0022] Figure 1This is a conceptual diagram illustrating a vehicle vibration device according to an embodiment of the present invention and a vehicle vibration method according to an embodiment of the present invention for vibrating a vehicle under inspection.

[0023] Figure 2 This diagram illustrates the vibration of one wheel of a vehicle under inspection in a vehicle vibration method according to an embodiment of the present invention.

[0024] Figure 3 This diagram illustrates the situation where the wheels of the vehicle under test are set at an initial set height in the vehicle vibration method according to an embodiment of the present invention.

[0025] Figure 4 This diagram illustrates a scenario in which a vehicle under test is simulated to travel on an undulating road in a vehicle excitation method according to an embodiment of the present invention.

[0026] Figure 5 This diagram illustrates a scenario in which different frequencies of excitation are superimposed on one wheel of a vehicle under inspection in the vehicle excitation method according to an embodiment of the present invention.

[0027] Figure 6 This is a flowchart illustrating the process of simulating driving on an undulating road using the vehicle excitation method according to an embodiment of the present invention.

[0028] Figure 7 This is a flowchart illustrating one embodiment of the vehicle excitation method according to the present invention.

[0029] Figure 8 This is a flowchart illustrating another aspect of the vehicle excitation method according to an embodiment of the present invention.

[0030] Figure 9 This is a flowchart illustrating the steps of another embodiment of the vehicle excitation method according to the present invention. Detailed Implementation

[0031] Next, embodiments of the present invention will be described with reference to the accompanying drawings. In the following figures, the same reference numerals are used for the same or corresponding parts. Figure 1 This is a schematic diagram illustrating a vehicle vibration device according to an embodiment of the present invention and a vehicle vibration method according to an embodiment of the present invention for vibrating a vehicle under inspection. Figure 2 This diagram illustrates the vibration of one wheel of a vehicle under inspection in a vehicle vibration method according to an embodiment of the present invention.

[0032] In the vehicle vibration method according to an embodiment of the present invention, the vehicle vibration device 1 has four vibration tables 3 corresponding to the four wheels of the vehicle 2 to be inspected. The four vibration tables 3 each have a similar structure. The vibration tables 3 are respectively disposed on a plate-shaped base 5 at positions corresponding to the four wheels W of the vehicle 2, wherein the plate-shaped base 5 is horizontally fixed to a horizontal floor 4 of a sturdy structure such as a test building. Figure 1 As shown, vehicle 2 is positioned in its normal position when tested using vehicle vibration device 1. The X-axis represents the front-to-back (length) direction of vehicle 2, the Y-axis represents the left-to-right (width) direction, and the Z-axis represents the up-and-down (vertical) direction. In the following description, unless otherwise stated, the front-to-back, left-to-right, and up-and-down directions are all expressed in the above senses.

[0033] The vibration table 3 is disposed on a movable base plate 6 mounted on a base 5. That is, a moving mechanism 10 is provided on the movable base plate 6 to form the vibration table 3. The moving mechanism 10 includes an actuator 9 that moves the front axle 7 (of the front axle 7 and rear axle 8) in the longitudinal horizontal direction. The front axle 7 and rear axle 8 are separated in a manner that clamps the corresponding wheels W of the vehicle 2 in the longitudinal direction and extend in the left-right direction. Four vibration tables 3 are provided, each corresponding to one of the four wheels W of the vehicle 2. Therefore, four moving mechanisms 10 are also provided, each corresponding to one of the four wheels W.

[0034] like Figure 1 As shown, in the vibration table 3 of the vehicle vibration device 1, when the wheel W is clamped in the longitudinal direction by the front axle 7 and the rear axle 8, and the front axle 7 is moved horizontally by the driving force of the actuator 9 of the moving mechanism 10 as shown by arrow A, the rear axle 8 rotates as shown by arrow B, and the wheel W is displaced upward in the longitudinal direction as shown by arrow C. This causes the actuator 9 to reciprocate, thereby exciting the wheel W in the longitudinal and vertical directions.

[0035] The moving mechanisms 10, each corresponding to one of the four wheels W, operate under the control of the control unit 11. That is, the hydraulic circuits of these actuators 9 operate under the control of the control unit 11, enabling each moving mechanism 10 to perform linked actions.

[0036] Reference Figure 2 One wheel W of the vehicle under inspection is moved in the front-rear horizontal direction by the moving mechanism 10, which moves the front axle 7 relative to the rear axle 8 which is fixed in position in the vehicle excitation device 1. This causes the gap between the front axle 7 and the rear axle 8 (hereinafter, this gap is appropriately referred to as the axle gap d) to change, and the height of the wheel W rises or falls according to this change.

[0037] exist Figure 2In the diagram, the height of wheel W is marked by the distance BL from the lower end of wheel W to the upper surface of base 5. If the axle spacing d is set to a specific initial setting interval s, wheel W is set at a specific initial setting height Hi as shown in the solid line diagram. When the front axle 7 is moved closer to the rear axle 8 and the axle spacing d is narrower than the initial setting interval a, wheel W rises from the initial setting height Hi. As shown by the dashed line, when the front axle 7 moves to a position near the axle of wheel W and the axle spacing d is reduced to n, the height of wheel W rises to Hh. Furthermore, by making the axle spacing d wider than the initial setting interval s, the height of wheel W can be lowered to a position H1, which is lower than the initial setting height Hi.

[0038] Figure 3 This diagram illustrates the scenario where the wheels of vehicle 2, the vehicle to be inspected, are set at an initially set height. Figure 3 In this process, the attitude and position of vehicle 2 on the road surface at a certain time point within the time interval T0 are marked as "S", and the situation where this attitude and position is simulated on the vehicle excitation device 1 is marked as "V" for comparison. Figure 3 In this setup, the attitude and position "S" of vehicle 2 are horizontal, and the lower ends of the front wheel Wf and the rear wheel Wr are at the lower limit of the valley of the "undulating road" where the vibration test is conducted. On the vehicle vibration excitation device 1, for the front wheel Wf and the rear wheel Wr of vehicle 2, the axle spacing d is set to the initial set spacing S, and the attitude and position of vehicle 2 are set to the initial set state.

[0039] Figure 4 This describes the situation in the vehicle excitation method according to an embodiment of the present invention, simulating the state of a vehicle under test traveling on an undulating road. Figure 4 In this diagram, T1, T2, and T3 represent time intervals in the time series as described above. The attitude and position of vehicle 2 on the road surface at a specific time point within each time interval are marked as "S," and the simulation of that attitude and position on the vehicle excitation device 1 is marked as "V." "S" and "V" are compared vertically. The detailed process of this vehicle excitation method will be described later.

[0040] Figure 5 This diagram illustrates a scenario where different frequencies of excitation are superimposed on one wheel of the vehicle under inspection in the vehicle excitation method according to an embodiment of the present invention. That is, Figure 5 The upper part of the diagram shows the change in shaft spacing d, representing the forward and backward movement of the front shaft 7, on the time axis, labeled "excitation shaft forward and backward movement". In this example, high-frequency vibration displacement is superimposed on sinusoidal low-frequency vibration displacement. Figure 5The lower half is labeled "tire's vertical movement," and the vertical movement of wheel W is represented on the same time axis as the upper half of the diagram. Furthermore, regarding the "tire's vertical movement," a sinusoidal curve connecting the center position of the micro-vibration is used to represent the micro-vibration corresponding to the high-frequency component in the "excitation shaft's forward and backward movement," while the actual "tire's vertical movement" is... Figure 5 The upper part exhibits a sinusoidal shape with the micro-vibrations corresponding to the high-frequency components. That is, it can simulate the excitation of undulating roads accompanied by micro-vibrations.

[0041] Next, refer to Figure 3 and Figure 4 , Figure 6 This section describes the process of simulating driving on an undulating road using the vehicle excitation method of this embodiment. As preparation, vehicle 2, the vehicle to be tested, is placed on the vehicle excitation device 1, with the front wheel Wf and rear wheel Wr positioned between the front axle 7 and rear axle 8 on the corresponding excitation platform 3, respectively. As the initial step in the excitation process, the axle spacing d is set to an initial value s relative to both the front wheel Wf and rear wheel Wr, and the front wheel Wf and rear wheel Wr are set to an initial set height. This causes the vehicle body to sink only to a height equivalent to the undulation height (amplitude) of the undulating road (step S61). This state is... Figure 3 The state.

[0042] Next, in Figure 4 At a certain point in time interval T1, the rear wheel Wr of vehicle 2 on the undulating road is located at the crest of the undulation, and the front wheel Wf is located at the trough of the undulation, resulting in a relatively high rear of the vehicle body. In order to simulate this state on the vehicle vibration device 1, the axle spacing d on the rear wheel Wr side is reduced to n, and the rear of the vehicle body is raised (step S62).

[0043] exist Figure 4 At a certain point in time interval T2 following time interval T1, the rear wheel Wr of vehicle 2 descends towards the trough of the undulating road, while the front wheel Wf rises towards the crest of the undulating road. The vehicle body exhibits a state where the rear side gradually descends and the front side gradually rises. To simulate this state on the vehicle's vibration excitation device 1, the axle spacing d on the rear wheel Wr side is gradually increased to s, while the axle spacing d on the front wheel Wf side is gradually decreased to n. This causes the height of the rear side of the vehicle body to decrease and the height of the front side of the vehicle body to increase (step S63).

[0044] exist Figure 4At a certain point in time interval T3 following time interval T2, the front wheel Wf of vehicle 2 descends towards the trough of the undulating road, while the rear wheel Wr rises towards the crest of the undulating road. The vehicle body exhibits a state where the front side gradually descends and the rear side gradually rises. To simulate this state on the vehicle's vibration excitation device 1, the axle spacing d on the front wheel Wf side is gradually increased to s, while the axle spacing d on the rear wheel Wr side is gradually decreased to n. This causes the height of the front side of the vehicle body to decrease and the height of the rear side of the vehicle body to increase (step S64).

[0045] In steps S63 and S64 above, the front wheel Wf and rear wheel Wr of vehicle 2 decrease or increase by an amount equivalent to the peak and valley amplitudes on the undulating road. If the number of decreases and increases has not reached the target number of vibration tests (step S65: "No"), steps S63 and S64 are repeated. When the target number is reached (step S65: "Yes"), the position and attitude of vehicle 2 are restored to the initial state in the same manner as in step S61 (step S66), and the vibration test ends.

[0046] Next, refer to Figures 7-9 Several methods of vehicle excitation methods according to embodiments of the present invention will be described.

[0047] Figure 7 This is a flowchart illustrating one aspect of the vehicle excitation method according to an embodiment of the present invention. Figure 7 In the vehicle excitation method, firstly during the initial height setting stroke, Figure 1 The distance d between the front axle 7 and the rear axle 8 in the front-rear direction in the excitation device 1 is set to a specific initial set distance s, and the wheel W is set to a specific initial set height (step S71).

[0048] Next, in the excitation step, a raising operation step and / or a lowering operation step are performed. This causes the wheel W to rise and / or fall (step S72). The raising operation step refers to making the distance d between the front axle 7 and the rear axle 8 in the longitudinal direction narrower than the initial set distance s, thereby raising the wheel W from an initial set height. The lowering operation step refers to making the distance d between the front axle 7 and the rear axle 8 in the longitudinal direction wider than the initial set distance s, thereby lowering the wheel W from the initial set height.

[0049] Next, the recovery step is performed. In this recovery step, the distance d between the front axle 7 and the rear axle 8 in the front-rear direction is restored to the initial set distance s (step S73).

[0050] After the recovery step in step S73, if the number of times wheel W rises and / or falls has not yet reached the target number of excitations for the excitation test (step S74: "No"), repeat steps S72 and S73 and continue excitation. When the number of times wheel W rises and / or falls reaches the target number of excitations for the excitation test (step S74: "Yes"), end the excitation test.

[0051] By executing the wheel W's ascent and descent in steps S72 and S73 on the time axis like a sine wave, it is possible to simulate the excitation of a sinusoidal undulating road. Additionally, as... Figure 5 As shown, by operating the front shaft 7, which serves as the excitation axis, in a distorted waveform rather than a sine wave manner, it is possible to excite a road with simulated distorted waveform undulations.

[0052] Figure 8 This is a flowchart illustrating steps in another embodiment of the vehicle excitation method according to the present invention. Figure 8 In the vehicle excitation method, firstly during the initial height setting stroke, Figure 1 The distance d between the front axle 7 and the rear axle 8 in the front-rear direction in the excitation device 1 is set to a specific initial set distance s, and the wheel W is set to a specific initial set height (step S81).

[0053] Next, the lifting operation step in the excitation step is performed (step S82). In the lifting operation step, the distance d between the front axle 7 and the rear axle 8 in the front-rear direction is made narrower than the initial set distance s, and the wheel W is raised from the initial set height.

[0054] Next, the descent operation step in the excitation step is performed (step S83). In the descent operation step, the distance d between the front axle 7 and the rear axle 8 in the front-rear direction is made wider than the initial set distance s, and the wheel W is lowered from the initial set height.

[0055] After the descent operation in step S83, if the number of times wheel W rises and falls has not yet reached the target number of excitations for the excitation test (step S84: "No"), steps S82 and S83 are repeated to continue excitation. When the number of times wheel W rises and falls reaches the target number of excitations for the excitation test (step S84: "Yes"), the excitation test ends.

[0056] By executing the wheel W's ascent and descent in steps S82 and S83 on the time axis like a sine wave, it is possible to simulate the excitation of a sinusoidal undulating road. Additionally, as... Figure 5 As shown, by operating the front shaft 7, which serves as the excitation axis, in a distorted waveform rather than a sine wave manner, it is possible to excite a road with simulated distorted waveform undulations.

[0057] Figure 9This is a flowchart illustrating another aspect of the vehicle excitation method according to an embodiment of the present invention. Figure 9 In the vehicle excitation method, firstly during the initial height setting stroke, Figure 1 The distance d between the front axle 7 and the rear axle 8 in the front-rear direction in the excitation device 1 is set to a specific initial set distance s, and the wheel W is set to a specific initial set height (step S91).

[0058] Next, a wheel raising operation step (step S92) is performed in the excitation step. In the wheel raising operation step, the distance d between the front axle 7 and the rear axle 8 in the front-rear direction is made narrower than the initial set distance s, and one of the front wheel Wf and the rear wheel Wr is raised from the initial set height.

[0059] Next, another wheel lowering operation step in the excitation step is performed (step S93). In the other wheel lowering operation step, the distance d between the front axle 7 and the rear axle 8 in the front-rear direction is made wider than the initial set distance n, and another wheel of the front wheel Wf and the rear wheel Wr is lowered from the aforementioned initial set height.

[0060] After the other wheel lowering operation step in step S93, if the number of times wheel W rises and falls has not yet reached the excitation number as the target of the excitation test (step S94: "No"), reverse the correspondence between the front wheel Wf and the rear wheel Wr in one wheel and the other wheel (step S95), and alternately repeat steps S92 and S93 to continue excitation. When the number of times wheel W rises and falls reaches the excitation number as the target of the excitation test (step S94: "Yes"), the excitation test ends.

[0061] On the time axis, the correspondence between the front wheel Wf and the rear wheel Wr in one wheel and the other is reversed like a sine wave, and the wheel W rising and falling operations in steps S92 and S93 are repeated alternately, thereby simulating the excitation of a sinusoidal undulating road. Additionally, as... Figure 5 As shown, by operating the front shaft 7, which serves as the excitation axis, in a distorted waveform rather than a sine wave manner, it is possible to excite a road with simulated distorted waveform undulations.

[0062] In the vehicle vibration excitation device 1, which is an embodiment of the present invention, the control unit 11 controls the moving mechanism 10 to perform the above-mentioned... Figures 6-9 The described steps include a moving mechanism 10 comprising an actuator 9 that moves the front axle 7 in the front-rear horizontal direction.

[0063] The vehicle excitation method according to this embodiment has the following effects.

[0064] In the vehicle excitation method of (1), in the initial height setting step (step S71), the axle spacing d, which is the distance between the front axle 7 and the rear axle 8 in the vehicle excitation device 1 in the longitudinal direction, is set to a specific initial setting spacing s, and the wheels are set to a specific initial setting height Hi; in the excitation step, excitation is performed by at least one of a rising operation step and a falling operation step, wherein the rising operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction narrower than the initial setting spacing and raising the wheels from the initial setting height, and the falling operation step is the step of making the distance between the front axle and the rear axle in the longitudinal direction wider than the initial setting spacing and lowering the wheels from the initial setting height (step S72). Thus, the vehicle can be excited while the vehicle position is raised and lowered, so as to conduct a test simulating the vehicle characteristics on the spring on an undulating road.

[0065] In the vehicle excitation method of (2), in the initial height setting step (step S81), the axle spacing d in the vehicle excitation device 1 is set to a specific initial setting spacing s, and the wheel is set to a specific initial setting height Hi; in the excitation step (step S84: "No" → step S82 → step S83), the rising operation step (step S82) and the falling operation step (step S83) are repeated alternately, wherein the rising operation step is to make the axle spacing d narrower than the initial setting spacing s and to raise the wheel from the initial setting height Hi, and the falling operation step is to make the axle spacing d wider than the initial setting spacing s and to lower the wheel from the initial setting height Hi. Thus, the vehicle can be excited while the vehicle position is raised and lowered, so as to conduct a test simulating the vehicle characteristics on the spring on an undulating road.

[0066] In the vehicle excitation method of (3), in the initial height setting step (step S91) for the front and rear wheels, the axle spacing d in the vehicle excitation device 1 is set to a specific initial setting spacing s, and the front wheel Wf and the rear wheel Wr are set to a specific initial setting height Hi; in the excitation step (step S94: "No" → step S95 → step S92 → step S93), one wheel raising operation step (step S92) and another wheel lowering operation step (step S93) are repeated alternately, wherein one wheel raising operation step is to make the axle spacing d narrower than the initial setting spacing and to raise one of the front wheel Wf and the rear wheel Wr from the initial setting height, and the other wheel lowering operation step is to make the axle spacing d wider than the initial setting spacing s and to lower the other of the front wheel Wf and the rear wheel Wr from the initial setting height. Thus, the vehicle can be excited while raising and lowering its position to conduct a test simulating the vehicle characteristics on the spring on an undulating road.

[0067] In the vehicle excitation method of (4), at least one of the front axle 7 and the rear axle 8 in the vehicle excitation device 1 is moved in the front-rear horizontal direction so that the wheel is excited in the front-rear vertical direction while the excitation step is performed, thereby enabling a test to simulate the virtual driving state of the vehicle on the undulating road with a frequency superimposed with a higher frequency.

[0068] In the vehicle vibration excitation device of (5), during the initial height setting operation of each operation performed by the control unit 11, the distance d between the front axle 7 and the rear axle 8 in the longitudinal direction is set to a specific initial setting distance s, and the wheels are set to a specific initial setting height Hi; vibration is performed using at least one of the rising operation and the falling operation, wherein the rising operation is an operation that makes the distance d narrower than the initial setting distance s and raises the wheels from the initial setting height Hi, and the falling operation is an operation that makes the distance d wider than the initial setting distance and lowers the wheels from the initial setting height Hi. Thus, the vehicle can be vibrated while the vehicle position is raised and lowered to conduct tests simulating the vehicle characteristics on the springs on undulating roads.

[0069] The embodiments of the present invention have been described above, but the present invention is not limited thereto. Details can be appropriately modified within the scope of the spirit of the invention. For example, in the above description, the initial height is set to be the height of the lowest point of the wheel corresponding to the lower limit of the valley of the undulating road; however, instead, the lowest point of the wheel can be set to the height of the middle of the peak and valley of the undulating road. Furthermore, the vibration of the undulating road can be simulated by the left and right wheels forming the same phase, or by forming the opposite phase. Additionally, in the above description, the front axle is moved horizontally back and forth, but this is not limited to this; the rear axle can also be moved horizontally back and forth. Furthermore, the excitation shaft, i.e., the front or rear axle, can be tilted a few degrees and moved, not necessarily strictly horizontally. In this case, if the excitation shaft contacts the tire from below at an angle, the load on the tire can be supported, and the vibration of the excitation shaft can be effectively transmitted to the tire.

[0070] Figure Labels

[0071] W wheel

[0072] Wf front wheel

[0073] Wr Rear Wheel

[0074] 1. Vibration excitation device for vehicles

[0075] 2 vehicles

[0076] 3 Excitation table

[0077] 4. Floor

[0078] 5. Base

[0079] 6 movable baseboards

[0080] 7. Front axle

[0081] 8 Rear Axle

[0082] 9 Actuators

[0083] 10. Mobile mechanisms

[0084] 11 Control Department

Claims

1. A vibration method for a vehicle, comprising a vibration device that uses a front axle and a rear axle extending in the left-right direction to clamp the front wheel and the rear wheel of a vehicle to be inspected in the front-rear direction, respectively, thereby moving at least one of the front axle and the rear axle in the front-rear horizontal direction, thereby exciting each of the front wheel and the rear wheel in the front-rear vertical direction. in, The vehicle excitation method includes the following steps: The initial height setting steps for the front and rear wheels involve setting the distance between the front and rear axles in the front-rear direction to a specific initial setting distance and setting the front and rear wheels to specific initial setting heights respectively. A wheel-raising operation step involves narrowing the distance between the front and rear axles in the longitudinal direction compared to the initial set distance, and raising one of the front and rear wheels from the initial set height; and, Another wheel-lowering operation involves widening the distance between the front and rear axles in the longitudinal direction compared to the initial set distance, and lowering one of the front and rear wheels from the initial set height. The excitation step, which includes the aforementioned wheel raising operation step and the aforementioned wheel lowering operation step, excites the vehicle under test by alternately repeating the following steps to change the tilt of the vehicle under test, thereby simulating driving on an undulating road: The steps of raising the front wheels from the aforementioned initial set height and lowering the rear wheels from the aforementioned initial set height; and The steps of raising the aforementioned rear wheel from the aforementioned initial set height and lowering the aforementioned front wheel from the aforementioned initial set height.

2. The vehicle excitation method according to claim 1, wherein, Move at least one of the aforementioned front axle and rear axle in the front-rear horizontal direction, thereby exciting the wheel in the front-rear vertical direction and repeating the aforementioned wheel raising operation step and the aforementioned wheel lowering operation step.

3. A vehicle vibration excitation device comprising clamping each of the front and rear wheels of a vehicle to be inspected in the longitudinal direction using a front axle and a rear axle extending in the left-right direction, and moving the aforementioned front axle in the longitudinal horizontal direction, thereby exciting each of the aforementioned front and rear wheels in the longitudinal vertical direction. in, The vehicle vibration excitation device includes: The moving mechanism includes an actuator that moves the aforementioned front axle in the front-rear horizontal direction, operates under the control of a specific control unit, and moves the aforementioned front axle. The aforementioned control unit causes the aforementioned moving mechanism to perform the following operations: The initial height setting operation for the front and rear wheels involves setting the distance between the aforementioned front axle and rear axle in the front-rear direction to a specific initial setting distance, and setting each of the aforementioned front and rear wheels to a specific initial setting height. A wheel-raising operation narrows the distance between the front and rear axles in the longitudinal direction compared to the initial set distance, and raises one of the front and rear wheels from the initial set height; and Another wheel descent operation makes the distance between the aforementioned front axle and rear axle in the front-rear direction wider than the aforementioned initial set distance, and lowers the other wheel of the aforementioned front wheel and rear wheel from the aforementioned initial set height; As an excitation operation comprising the aforementioned upward movement and the aforementioned downward movement, the following operations are repeated alternately: The operation of raising the front wheels from the aforementioned initial set height and lowering the rear wheels from the aforementioned initial set height; and The operation of raising the aforementioned rear wheels from the aforementioned initial set height and lowering the aforementioned front wheels from the aforementioned initial set height. The control is performed to perform the following operation: to excite the vehicle under test to change its tilt, thereby simulating driving on an undulating road.

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