Road surface state obtaining device and suspension system
First Claim
1. A road surface state obtaining device, comprising:
- an emitting device mounted on a vehicle body of a vehicle and configured to emit light such that a plurality of parallel light beams emitted from the emitting device impinge on a road surface to form a plurality of marks spaced apart from each other;
an imaging device mounted on the vehicle body and configured to form an image by taking an image of an image pickup object on a predetermined region containing the plurality of marks formed on the road surface; and
an inclination state obtainer configured to obtain an inclination state of the road surface based on a relative positional relationship between at least two mark images of a plurality of mark images on the image formed by the imaging device, the plurality of mark images respectively corresponding to the plurality of marks,the inclination state obtainer comprising (a) a longitudinal distance obtainer configured to obtain a distance between the at least two mark images in the longitudinal direction as the relative positional relationship and (b) a gradient obtainer configured to obtain a magnitude of a gradient as the inclination state of the road surface based on the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer, andthe gradient obtainer comprising a gradient-determination-table storage device configured to store a relationship between the magnitude of the gradient of the road surface and the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer.
1 Assignment
0 Petitions
Accused Products
Abstract
An emitting device emits parallel light beams which impinge on a road surface, forming marks. An imaging device takes an image of an image pickup object containing the marks to obtain a picked-up image. A longitudinal distance between mark images respectively corresponding to the marks is detected. A larger gradient can be obtained in the case where the distance is long than in the case where the distance is short. While the gradient of the road surface is obtained based on the distance as described above, a relative positional relationship between the two mark images is not changed as long as the gradient of the road surface is the same even when the height position of an over-spring member provided with the emitting device and the imaging device is changed. Accordingly, the gradient of the road surface can be obtained without consideration of the displacement of the over-spring member.
5 Citations
14 Claims
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1. A road surface state obtaining device, comprising:
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an emitting device mounted on a vehicle body of a vehicle and configured to emit light such that a plurality of parallel light beams emitted from the emitting device impinge on a road surface to form a plurality of marks spaced apart from each other; an imaging device mounted on the vehicle body and configured to form an image by taking an image of an image pickup object on a predetermined region containing the plurality of marks formed on the road surface; and an inclination state obtainer configured to obtain an inclination state of the road surface based on a relative positional relationship between at least two mark images of a plurality of mark images on the image formed by the imaging device, the plurality of mark images respectively corresponding to the plurality of marks, the inclination state obtainer comprising (a) a longitudinal distance obtainer configured to obtain a distance between the at least two mark images in the longitudinal direction as the relative positional relationship and (b) a gradient obtainer configured to obtain a magnitude of a gradient as the inclination state of the road surface based on the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer, and the gradient obtainer comprising a gradient-determination-table storage device configured to store a relationship between the magnitude of the gradient of the road surface and the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A suspension system, comprising:
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a road surface state obtaining device, the road surface state obtaining device comprising; an emitting device mounted on a vehicle body of a vehicle and configured to emit light such that a plurality of parallel light beams emitted from the emitting device impinge on a road surface to form a plurality of marks spaced apart from each other; an imaging device mounted on the vehicle body and configured to form an image by taking an image of an image pickup object on a predetermined region containing the plurality of marks formed on the road surface; and an inclination state obtainer configure to obtain an inclination state of the road surface based on a relative positional relationship between at least two mark images of a plurality of mark images on the image formed by the imagining device, the plurality of mark images respectively corresponding to the plurality of mark, the inclination state obtainer comprising (a) a longitude distance obtainer configured to obtain a distance between the at least two mark images in the longitudinal direction as the relative positional relationship and (b) a gradient obtainer configured to obtain a magnitude of a gradient as the inclination state of the road surface based on the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer, and the gradient obtainer comprising a gradient-determination-table storage device configured to store a relationship between the magnitude of the gradient of the road surface and the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer; and a suspension control device configured to control at least one suspension for at least one control target wheel based on the inclination state of the road surface which is obtained by the road surface state obtaining device, the road surface state obtaining device comprising a front-side road-surface-state obtainer configured to obtain an inclination state of a portion of the road surface which is located in front of the at least one control target wheel. - View Dependent Claims (10, 11, 12)
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13. A road surface state obtaining device, comprising:
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an emitting device mounted on a vehicle body of a vehicle and configured to emit light such that a plurality of parallel light beams emitted from the emitting device impinge on a road surface to form a plurality of marks spaced apart from each other; an imaging device mounted on the vehicle body and configured to form an image by taking an image of an image pickup object on a predetermined region containing the plurality of marks formed on the road surface; and an inclination state obtainer configured to obtain an inclination state of the road surface based on a relative positional relationship between at least two mark images of a plurality of mark images on the image formed by the imaging device, the plurality of mark images respectively corresponding to the plurality of marks, the inclination state obtainer comprising (a) a longitudinal distance obtainer configured to obtain a distance between the at least two mark images in the longitudinal direction as the relative positional relationship and (b) a gradient obtainer configured to obtain a magnitude of a gradient as the inclination state of the road surface based on the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer, the emitting device and the imaging device being mounted on the vehicle body in a relative positional relationship in which an emission angle of the light emitted from the emitting device with respect to a reference road surface of which normal line is a line extending in an up and down direction of the vehicle is greater than an inclination angle of an axis of the imaging device with respect to the reference road surface, and the gradient obtainer comprising a first gradient obtainer configured to obtain a greater gradient of the road surface when the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer is long than when the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer is short.
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14. A road surface state obtaining device, comprising:
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an emitting device mounted on a vehicle body of a vehicle and configured to emit light such that a plurality of parallel light beams emitted from the emitting device impinge on a road surface to form a plurality of marks spaced apart from each other; an imaging device mounted on the vehicle body and configured to form an image by taking an image of an image pickup object on a predetermined region containing the plurality of marks formed on the road surface; and an inclination state obtainer configured to obtain an inclination state of the road surface based on a relative positional relationship between at least two mark images of a plurality of mark images on the image formed by the imaging device, the plurality of mark images respectively corresponding to the plurality of marks, the inclination state obtainer comprising (a) a longitudinal distance obtainer configured to obtain a distance between the at least two mark images in the longitudinal direction as the relative positional relationship and (b) a gradient obtainer configured to obtain a magnitude of a gradient as the inclination state of the road surface based on the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer, the emitting device and the imaging device being mounted on the vehicle body in a relative positional relationship in which an emission angle of the light emitted from the emitting device with respect to a reference road surface of which normal line is a line extending in an up and down direction of the vehicle is less than an inclination angle of an axis of the imaging device with respect to the reference road surface, and the gradient obtainer comprising a second gradient obtainer configured to obtain a less gradient of the road surface when the distance between the at least two mark images in the longitudinal direction which distance is obtained by the longitudinal distance obtainer is long than when the distance between the at least two mark images in the longitudinal direction is short.
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Specification