JP6781368B2 - Chassis dynamometer - Google Patents

Description

The present invention relates to a chassis dynamometer used for various driving tests such as measurement of horsepower and fuel consumption of a vehicle such as an automobile, and can perform required driving performance tests, running tests, etc., particularly even when the traveling wheels of the vehicle are steered. In addition, the present invention relates to a chassis dynamometer that enables simulation of a vehicle traveling locus, such as whether or not a traveling route can be followed according to a program during automatic driving.

As a chassis dynamometer used for various tests of a vehicle, a chassis dynamometer on which a driving wheel of the vehicle is placed and a roller whose rotation axis direction is the left-right direction of the vehicle is provided so as to be movable in the front-rear direction of the vehicle is generally used. It is known (see, for example, Patent Document 1).

However, conventionally, this type of chassis dynamometer is only assumed to travel straight, and is a roller type that can reproduce the turning state of the vehicle by steering the drive wheels of the vehicle as in actual driving, for example. Equipment is required.

In addition, a device that simulates an automatic driving system on a bench is commercially available with the tires (wheels) removed, but the steering wheel is actually steered with the tires attached to verify the traveling trajectory. A system that can do so has not been realized because there is no device for aligning the turning center of the tire and there is a risk of derailing.

In order to meet such a demand, a member for supporting the roller on which the wheel is placed is provided on the turntable so as to be able to turn, and the roller support member is rotationally driven according to the steering operation state to be in the steering state. A chassis dynamometer capable of performing the required running test has already been proposed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 8-152380 JP-A-2009-162627

However, in the chassis dynamometer previously proposed described above, the pivot shaft, which is the turning center when the wheel is turning, and the turning shaft, which is the turning center of the member supporting the roller, cannot be aligned. Even if you actually try to perform a running test of the vehicle, if you perform an arbitrary steering operation with the wheels of the vehicle mounted on the rollers, the wheels may come off from the rollers, which is not feasible. It was a thing.

As a result of various studies and studies to solve the above-mentioned problems, the present inventors have conducted various studies and studies, and as a result, when the wheel is steered, the wheel is swiveled, but the turning center of the wheel is mounted on the roller. It was found that it is deviated from the center of the ground contact position, and that this deviation also differs depending on the type of vehicle.

That is, strictly speaking, we focused on the fact that the turning center of each wheel is not perpendicular to the ground, but is a polynomial at the coordinate points of the x and y axes with the steering angle as a variable.
In general passenger cars, the x and y displacements of the turning center axis are very small when viewed from the wheel width, and if the offset distance from the wheel center axis is set, the wheels will not deviate from the rollers even at the steering angle limit. It was confirmed.
If the vehicle has a magnitude deviation so as to deviate, the roller vertical axis and the tire turning center can be easily aligned by the above two-axis movement of x and y.

The present invention has been made in view of such circumstances, and various tests of the vehicle with the steering wheels steered can be performed extremely easily and appropriately, and the turning running that accurately simulates the actual running of the vehicle can be performed. The purpose is to obtain a chassis dynamometer that can perform various running tests under the condition.

The chassis dynamometer according to the present invention (the invention according to claim 1) is used to meet such an object.
It is a chassis dynamometer used to perform various running tests suitable for actual running by providing a roller on which the running wheel of the vehicle is placed on the zenith and putting the running vehicle in a simulated running state.
It is provided with a roller support member that rotatably supports the roller and a swivel means for supporting the roller support member so as to be swivelable on a support surface plate.
The traveling wheel is placed on the roller so that its ground contact point is located at the zenith of the roller, and is positioned so as to maintain a state in which the axial direction thereof is substantially parallel to the rotation axis of the roller. And
In the vicinity of the traveling wheel mounting portion of the roller, a plurality of pressing guides are provided so as to be sandwiched from the left and right sides of the traveling wheel and for detecting the behavior of the traveling wheel when steering in the left-right direction. ,
The presser guide is provided with a sensor that detects the distance from the traveling wheel.
The turning means is driven and controlled according to the steering behavior of the traveling wheel, and the roller support member that pivotally supports the roller is swiveled around a predetermined turning shaft on the support surface plate. It is characterized by being done.

The chassis dynamometer according to the present invention (the invention according to claim 2) is
In the chassis dynamometer according to claim 1,
The x, y directions (x, y) generated between the pivot shaft, which is the steering center of the traveling wheel, which is predetermined by the conditions peculiar to the vehicle to be tested, and the turning shaft on the support surface plate of the roller support member. It is characterized in that an offset position adjustment table for movement adjustment is provided on the x and y planes in order to match the deviations (a function of the steering angle of the tire).
Here, the deviation in the x and y directions is not large compared to the width of the traveling wheel (tire), but the deviation in the y direction is particularly small.

The chassis dynamometer according to the present invention (the invention according to claim 3) is
In the chassis dynamometer according to claim 1 or 2.
The presser guide is a sensor that measures the distance between the guide roller that faces the left and right side surfaces of the traveling wheel in a non-contact state and the traveling wheel during steering in a non-contact state. It is characterized by having and.
Here, a guide roller is provided as a pressing guide to make it a rotatable member, but if the guide roller is brought into contact with the tire with a large surface pressure, there is a risk of unnecessary damage, so the actual contact state is set. Is desirable.

The chassis dynamometer according to the present invention (the invention according to claim 4) is
In the chassis dynamometer according to claim 3,
The presser guide is provided so as to be slidable with respect to the roller support member in the direction of the rotation axis of the roller, and is configured to be sandwiched from both the left and right sides with the traveling wheel mounted.

The chassis dynamometer according to the present invention (the invention according to claim 5) is
In the chassis dynamometer according to any one of claims 1 to 4.
The left and right traveling wheels of the vehicle under test are steered at different turning angles during steering.
The left and right roller supporting means for supporting the left and right rollers on which the left and right traveling wheels are mounted are left and right centered on a predetermined turning axis on the support surface plate by the left and right turning means. It is characterized in that it is configured to be swiveled at a swivel angle corresponding to each rolling angle.

As described above, according to the chassis dynamometer according to the present invention, various tests of the vehicle can be appropriately and reliably performed even in an arbitrary steering state.
It is also possible to simulate the vehicle travel locus, such as whether the vehicle can follow the travel route according to the program during automatic driving.

An embodiment of a chassis dynamometer according to the present invention is shown, and a schematic side sectional view of an entire traveling test apparatus using the same. FIG. 1 is a schematic side sectional view seen from the front of the vehicle. The turning axis of the roller support member that supports the rollers is the center axis S, which is a vertical perpendicular line passing through the contact point with respect to the roller in the center of the width direction of the traveling wheel, and the rolling of the traveling wheel, which is predetermined by the conditions peculiar to the vehicle under test. Explanatory drawing for explaining the relationship with the pivot axis P which becomes the steering center. The schematic plan view of FIG. FIG. 3 is an explanatory view of the operation of the traveling test device when the front wheels of the vehicle are steered. The schematic perspective view which enlarges and shows the roller support member, the turning means, etc. which characterize this invention. FIG. 5 is a schematic perspective view showing a support box with an imaginary line with respect to the roller support member and the swivel means of FIG.

1 to 7 show an embodiment of the chassis dynamometer according to the present invention.
In these figures, the one indicated by reference numeral 1 as a whole is a running test used for performing various running tests suitable for actual running by putting the vehicle C under test into a pseudo running state by using a chassis dynamometer. A roller 16 corresponding to the left and right traveling wheels T in front of, behind, and right of the vehicle C to be tested and a roller support member 10 supporting the roller 16 are located near the opening of the recessed portion 3 recessed in the test area 2. Have been placed. The two pairs of front and rear roller support members 10 support the support shaft 14 in each support box 12, and the front, rear, left, and right traveling wheels T correspond to the front, rear, left, and right traveling wheels T on each of the support shafts 14. After that, the left and right rollers 16 are pivotally supported.

Here, 6 in FIG. 1 is a base plate arranged so as to cover the opening of the recessed portion 3, and the zenith portion of the roller 16 is exposed from a partial opening thereof, and the vehicle C to be tested is carried in. The wheel T is configured to be placed on the zenith of the roller 16.
Reference numeral 5 denotes a vehicle lashing rope for fixing the vehicle C under test at a predetermined position.

According to the present invention, in the traveling test device 1 constituting the chassis dynamometer, a roller support member that supports a roller 16 on which a pair of traveling wheels T forming a front-rear and left-right pair of the vehicle under test C is placed on the zenith. Each of the 10 is configured to be rotatably supported on a horizontal plane around a vertically extending swivel axis (P) by a swivel means 20 as shown enlarged in FIGS. 5 and 6. It is said.

More specifically, the roller 16 on which each of the traveling wheels T is mounted on the zenith portion includes a roller support member 10 that rotatably supports the rotation shaft 14 extending in the horizontally direction, and the roller support member The support box 12 constituting the 10 is configured to be supported so as to be able to rotate on the support surface plate 22 via the turning means 20 described later.

As a result, each traveling wheel T of the vehicle C to be tested is steered and controlled, so that the roller 16 on which each traveling wheel T is mounted rotates according to the amount of steering of the wheel T, and the wheel T It is configured so that the ground contact relationship with is always in a constant posture.

That is, the traveling wheel T is placed on the roller 6 so that its ground contact point is located at the zenith of the roller 16, and its axle direction is substantially parallel to the rotation axis of the roller 16. Positioned to maintain.

Here, as is clear from FIGS. 5 and 6, the roller support member 10 that pivotally supports the roller 16 is housed with the zenith portion left, and is rotatably supported by the support shaft 14 that serves as a rotation shaft. It has a roller unit including a support box 12 which is a roller case, and an electric power meter (dynamometer) 18 and the like connected to the side thereof via a rotation shaft 14 coupling.

On the other hand, the support surface plate 22 is supported and fixed to the bottom surface of the recessed portion 3 of the test area 2 while maintaining a horizontal state, and is used as a swivel means 20 and an offset position adjusting means (described later) on the support surface plate 22. The roller unit including the roller support member 10 is arranged with the table unit interposed therebetween.

The swivel drive unit 40 constituting the swivel means 20 as the table unit rotates the rotary discs 44, 42 with each other by interposing, for example, a ball bearing, between the upper and lower rotary discs 44, 42. It is configured to rotate relative to the center, and also includes a swivel motor 46 and the like for driving the large gear 44a with a pinion 46a as a drive source thereof.

Further, the lower rotating disk 42 is arranged and fixed on the lower slide plate 24 which is slidably arranged on the support surface plate 30 via the y-direction slide rail means (rail 22a, groove 24a). There is. A cylinder 26b containing a servomotor and an arm 26a corresponding thereto are provided as y-direction positioning means 26 that enables the slide plate 24 to be moved and adjusted.

The upper rotating disk 44 is also arranged so as to be slidably adjustable between the roller support member 10 serving as the roller unit and the bottom of the support box 12 via an x-direction slide rail means (rail 12a, groove 30a). It is fixed to the lower surface of the slide plate 30. As a result, the positioning adjustment in the x and y directions can be performed so that the pivot axis P, which is the steering center of the traveling wheel, which is determined by the vehicle-specific conditions different for each vehicle, matches the turning axis (P) by the turning means 20. It is configured as follows. As the x-direction positioning means 32 that enables the slide plate 30 to be moved and adjusted, a cylinder with a servomotor 32b and an arm 32a corresponding thereto are provided.

That is, the vehicle C to be tested is unique to the vehicle C by the offset position adjustment table for movement adjustment on the x and y planes by the slide plates 24 and 30 which are moved and adjusted by the y-direction positioning means 26 and the x-direction positioning means 32 described above. The x, y directions (x, y) generated between the pivot shaft P, which is the steering center of the traveling wheel T, which is predetermined by the conditions, and the swivel shaft (P) on the support platen 22 of the roller support member 10. Is configured to match the deviations (a function of the steering angle of the tire).

For example, in FIG. 3, the turning shaft (P) of the roller support member 10 on the support platen 22 is a vertical vertical line passing through a contact point with respect to the roller 16 at the center in the width direction of the traveling wheel T. When the position is the position of the pivot axis P predetermined by the conditions peculiar to the vehicle C to be tested, the offset position adjustment table for movement adjustment is slid-driven and turned on the x and y planes. The axis (P) may be adjusted and positioned so as to match the position of the pivot axis P.

The deviation in the x and y directions is small, but the deviation in the y direction is particularly small, and the adjustment can be easily performed.
Of course, such an offset position adjusting means is not limited to the table for adjusting the movement in the x and y directions described above, and may have an appropriate structure, and in some cases, either in the x direction or the y direction. Needless to say, one of the adjustment mechanisms may be used.

Here, the coordinates of the turning center of the pivot axis P described above move at the top of the roller 16 because of the combination of the toe-in, camber, and caster angle unique to the vehicle, and the original center is the roller 16. At the inner point of.
Then, by moving the swivel axis (P) on the top x and y planes of the roller 16, the traveling on the roller 16 is similar to the traveling on the ground.
For the sake of clarity, FIGS. 2, 4 and 5 described above do not show these three angles (toin, camber and caster angles).

On the other hand, in the vicinity of the traveling wheel mounting portion of the roller 16, the traveling wheel T abuts on the left and right side surfaces of the traveling wheel T as a wheel behavior detecting means 50 for detecting the behavior of the traveling wheel T when steering in the left-right direction. A guide roller 52 with two pairs of left and right sensors for detecting the steering operation of the traveling wheel T is arranged as a holding guide that also serves as the guide roller 52.

As is clear from FIGS. 1, 2, 6, 7, 7 and the like, these guide rollers 52 are attached to the left and right side surfaces of the traveling wheel T so as to maintain a predetermined posture with respect to the roller 16. It functions as a supporting left and right holding means, supports the traveling wheel T of the vehicle C on the zenith of the roller 16 in a required posture during a traveling test, and can detect the movement of the wheel T during steering. It is configured in.

Further, each guide roller 52 is provided in a state in which the position of each guide roller 52 can be adjusted in the rotation axis direction of the roller 16 with respect to the shaft 54 supported near the upper opening of the support box 12 constituting the roller support member 10. Such slide adjustment is for setting the vehicle C to be tested so as to sandwich both side surfaces of the wheels T when the traveling wheels T are placed on the rollers 6.

In other words, by placing the wheel T on the roller 6 and positioning the guide roller 52 as a pressing guide so as to sandwich both side surfaces thereof, a vertical vertical line passing through the ground contact point at the center in the width direction of the roller 6. Since the position of is known, it is sufficient to offset it so that the positions x and y are the turning centers.

The wheel behavior detecting means 50 described above is not limited to the guide roller 52 with a sensor, for example, a distance sensor (for example, an ultrasonic sensor or a pressure sensor) arranged at a plurality of positions facing the left and right side surfaces of the wheel T. Needless to say, it may be various sensors such as. That is, such a sensor functions as a distance measuring device between the wheel and the sensor that measures the distance between the wheel T and the wheel T, whereby the movement of the wheel T at the time of steering can be detected.

The roller support member 10 that drives and controls the turning means 20 according to the behavior of the traveling wheel T by the guide roller 52 that is such a wheel behavior detecting means and pivotally supports the roller 16 is supported by the support surface plate 22. It is configured to rotate around a predetermined turning axis (P) above.

Here, the turning shaft (P) of the roller support member 10 on the support platen 22 is predetermined by a condition peculiar to the vehicle under test, and is a vertical shaft passing from the support plateau 22 to the center of the roller 16. Therefore, it is set to be adjustable to a vehicle-specific offset position deviated from the center axis S by the vertical line passing through the center of the roller 16 and the wheel contact point of the roller zenith.

That is, the left and right traveling wheels T are steered at different turning angles when the vehicle C is steered, and support the left and right rollers 6 on which the left and right traveling wheels T are mounted. The left and right roller support means 10 are configured to be swiveled at a swivel angle corresponding to each of the left and right swivel angles around a predetermined swivel axis P on the left and right support platen 22s. Has been done.

In the test of the vehicle C under test using the chassis dynamometer as described above, the vehicle C under test is fixed using a rope or the like with each traveling wheel T of the vehicle C under test placed on the zenith of the roller 16. Then, while rotating the roller 16, the force acting between the drive wheel of the vehicle C to be tested and the peripheral surface of the roller is measured by using each dynamometer 18.

When the steering operation of the vehicle C is performed during this test, when the respective traveling wheels T are displaced according to the operation during steering, the behavior of the wheels is detected accordingly, and the respective wheels are detected accordingly. The roller 16 is swiveled. That is, at the time of the test, it is necessary to set the ground contact posture between the wheel T and the roller 16 to always have a constant relationship, and by detecting the movement of each wheel T at the time of steering, the roller 16 is swiveled and controlled. By doing so, it is possible to carry out a running test in a stable state at all times.

In the vehicle C under test, the left and right traveling wheels T have different steering angles, but by turning and controlling the roller 16 on which the wheels T touch the ground in response to these movements, it is easy and safe. It is possible to perform a running test.

It is needless to say that the present invention is not limited to the structure described in the above-described embodiment, and the shape, structure, etc. of each part constituting the traveling test device 1 using the chassis dynamometer can be appropriately modified or changed. ..
Needless to say, for example, the specific structure of the roller unit by the roller support member 10 including the roller 16, the table unit by the swivel means 20, and the support surface plate 22 can be appropriately deformed and changed.

Further, the vehicle C to be tested used in the traveling test device 1 as the chassis dynamometer according to the present invention may be a normal two-wheel steering vehicle, a two-wheel drive vehicle, a four-wheel steering vehicle, a four-wheel drive vehicle, or the like. It goes without saying that it is a good one and can be appropriately modified and changed as needed.

Further, in the traveling test device 1 as a chassis dynamometer according to the present invention, a case where a unit including a roller support member 10 and a turning means 20 is arranged on each of the front and rear traveling wheels T has been described as an example. It goes without saying that the present invention is not limited to this, and a unit corresponding only to the front wheels may be provided.

1 Running test device as chassis dynamometer 2 Test area 3 Recessed part 10 Roller support member 12 Support box 14 Support shaft 16 Roller 18 Dynamometer 20 Swivel means 22 Support plate 24 Slide plate 26 y-direction positioning means 30 Slide plate 32 x Directional positioning means 40 Swivel drive unit 42 Lower rotation disk 44 Upper rotation disk 50 Wheel behavior detection means 52 Presser guide (guide roller) with a sensor that also serves as a guide roller
C Vehicle under test T Traveling wheel S Center axis P Pivot axis

Claims (5)

It is a chassis dynamometer used to perform various running tests suitable for actual running by providing a roller on which the running wheel of the vehicle is placed on the zenith and putting the running vehicle in a simulated running state.
It is provided with a roller support member that rotatably supports the roller and a swivel means for supporting the roller support member so as to be swivelable on a support surface plate.
The traveling wheel is placed on the roller so that its ground contact point is located at the zenith of the roller, and is positioned so as to maintain a state in which the axial direction thereof is substantially parallel to the rotation axis of the roller. And
In the vicinity of the traveling wheel mounting portion of the roller, a plurality of pressing guides are provided so as to be sandwiched from the left and right sides of the traveling wheel and for detecting the behavior of the traveling wheel when steering in the left-right direction. ,
The presser guide is provided with a sensor that detects the distance from the traveling wheel.
The turning means is driven and controlled according to the behavior of the traveling wheel during steering, and the roller support member that pivotally supports the roller is swiveled around a predetermined turning shaft on the support surface plate. Chassis dynamometer characterized by being. In the chassis dynamometer according to claim 1,
The x, y directions (x, y) generated between the pivot shaft, which is the steering center of the traveling wheel, which is predetermined by the conditions peculiar to the vehicle to be tested, and the turning shaft on the support surface plate of the roller support member. A chassis dynamometer characterized by having an offset position adjustment table for movement adjustment on x and y planes in order to match deviations (a function of the steering angle of the tire). In the chassis dynamometer according to claim 1 or 2.
The presser guide is a sensor that measures the steering behavior of the traveling wheel and the guide roller that faces the left and right side surfaces of the traveling wheel in a non-contact state, in a non-contact state. A chassis dynamometer characterized by having and. In the chassis dynamometer according to claim 3,
The chassis guide is provided so as to be slidable with respect to the roller support member in the direction of the rotation axis of the roller, and is configured to be sandwiched from both left and right sides with the traveling wheel mounted. Dynamometer. In the chassis dynamometer according to any one of claims 1 to 4.
The left and right traveling wheels of the vehicle under test are steered at different turning angles during steering.
The left and right roller supporting means for supporting the left and right rollers on which the left and right traveling wheels are mounted are left and right centered on a predetermined turning axis on the support surface plate by the left and right turning means. A chassis dynamometer characterized in that it is configured to be swiveled at a swivel angle corresponding to each rolling angle.

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