JP-7857119-B2 - Vehicle detection device

JP7857119B2JP 7857119 B2JP7857119 B2JP 7857119B2JP-7857119-B2

Inventors

木田喜啓
河野隆修
木村優介
赤間貞洋
堀畑晴美
近江徹哉
北浦靖寛
小林篤史
森川鉄平

Assignees

株式会社SOKEN
株式会社デンソー

Dates

Publication Date: 20260512
Application Date: 20220307

Claims (6)

A base portion (42) fixed to the vehicle body, The bearing (50) comprises an outer ring member (51), an inner ring member (52), and rolling elements (53) provided between the outer ring member and the inner ring member, and rotatably supports the wheel of the vehicle relative to the base portion. Of the outer ring member and the inner ring member, the first bearing member (52) is fixed to the wheel, and the other, the second bearing member (51), is fixed to the base portion. A disc-shaped detection rotating part (80, 83, 86) is provided to rotate integrally with the first bearing member and extends radially outward from the bearing relative to the first bearing member, Among the base portion, a displacement detection unit (90, 90A, 90B) is provided in a non-contact state with the detection rotating unit at a position away from the bearing in the radial direction and facing the detection rotating unit in the axial direction of the bearing, and outputs a signal corresponding to the axial displacement of the detection rotating unit. Equipped with, Of the aforementioned rotating detection part, at a position in the radial direction away from the bearing, annular detection target parts (81, 82, 84, 85, 87, 88) extending in the circumferential direction of the bearing are formed. The displacement detection unit is It has a planar receiving coil (110, 120 ) that is fixed to the base portion and positioned opposite the detection target portion in the axial direction, and extends in a direction intersecting the axial direction , A processing unit (70) that calculates the axial displacement of the detection rotating part based on the output voltage signal of the receiving coil , The displacement detection unit includes a first displacement detection unit (90A) and a second displacement detection unit (90B), Equipped with, The receiving coil of the first displacement detection unit is provided at a position facing the upper end of the detection rotating unit in the axial direction, The receiving coil of the second displacement detection unit is provided at a position facing the lower end of the detection rotating unit in the axial direction, The first displacement detection unit and the second displacement detection unit are configured such that the phase of the output voltage signal of the receiving coil provided by the first displacement detection unit and the phase of the output voltage signal of the receiving coil provided by the second displacement detection unit are the same. The processing unit calculates the displacement based on the difference between the output voltage signal of the receiving coil provided by the first displacement detection unit and the output voltage signal of the receiving coil provided by the second displacement detection unit, in a vehicle detection device.
The displacement detection unit includes an excitation coil (100) to which an AC excitation voltage is supplied. The vehicle detection device according to claim 1, wherein the receiving coil induces a voltage when the excitation voltage is supplied to the excitation coil.
The detection target unit is, A configuration in which metal parts (81) and parts (82) that penetrate in the axial direction are alternately provided in the circumferential direction. The configuration is such that recesses (88) that are recessed in the axial direction and protrusions (87) that project from the recesses in the axial direction are alternately provided in the circumferential direction, or that metal parts and non-metal parts are alternately provided in the circumferential direction. The vehicle detection device according to claim 2 , wherein the processing unit further calculates the rotation angle of the detection rotating unit based on the output voltage signal of the receiving coil.
The receiving coil is A first receiving coil (110) from which a voltage is induced when the excitation voltage is supplied to the excitation coil, The excitation coil is supplied with the excitation voltage, and the second receiving coil (120) is used to induce a voltage that is out of phase with respect to the induced voltage of the first receiving coil. The vehicle detection device according to claim 3 , wherein the processing unit calculates the rotation angle based on the output voltage signals of the first receiving coil and the second receiving coil.
The system includes an amplification unit (AP) that amplifies and outputs the difference between the output voltage signal of the receiving coil provided by the first displacement detection unit and the output voltage signal of the receiving coil provided by the second displacement detection unit. The vehicle detection device according to any one of claims 1 to 4, wherein the processing unit calculates the displacement based on the output voltage signal of the amplification unit.
The vehicle detection device according to any one of claims 1 to 5 , wherein the processing unit calculates the lateral force acting on the wheel based on the calculated displacement.

Description

This invention relates to a detection device for vehicles. Conventionally, as described in Patent Document 1, a bearing unit is known that rotatably supports a hub fixed to a wheel relative to the vehicle body. The bearing unit comprises an outer ring fixed to the vehicle body, an inner ring fixed to the hub, and rolling elements between the outer and inner rings. Here, in order to stabilize the vehicle's movement, it is desirable that the vehicle's movement be controlled based on the force acting on the wheel (e.g., lateral force). Patent Document 1 describes a configuration for detecting forces acting on a wheel, comprising a detection ring provided on the inner circumference of the inner ring and fixed to the hub, and a displacement sensor unit. The detection ring comprises a cylindrical portion and a bent portion that curves radially outward from the axial end of the cylindrical portion. The tip of the displacement sensor unit is positioned on the inner circumference of the inner ring. The tip of the displacement sensor unit is provided with a displacement measuring element facing the bend in the axial direction of the bearing unit. When a force acts on a wheel, the inclination of the inner wheel's central axis relative to the outer wheel's central axis increases. In this case, the axial distance between the displacement measuring element and the bent section changes. This change in distance is detected as the axial displacement of the bent section. The detected displacement is then converted into the force acting on the wheel. Patent No. 3900031 A longitudinal cross-sectional view of the wheel according to the first embodiment.Plan view of the racing section.This diagram shows the state in which the inner wheel is tilted relative to the outer wheel when a lateral force is applied to the tire.A diagram showing the detection unit.A diagram showing the electrical configuration of the detection unit and processing unit.Projection views of the excitation coil and the first and second receiving coils in a plan view of a multilayer substrate.A diagram showing the wiring pattern and vias formed on the first layer of a multilayer substrate.A diagram showing the wiring pattern and vias formed in the second layer of a multilayer substrate.A diagram showing the wiring pattern and vias formed in the third layer of a multilayer substrate.A diagram showing the wiring pattern and vias formed in the fourth layer of a multilayer substrate.A diagram illustrating the principle of detecting displacement and rotation angle.A diagram illustrating the principle of detecting displacement and rotation angle.A simplified plan view of the second receiving coil.A diagram showing the output voltage signal of the receiving coil and the changes in the envelope of this signal.This figure shows the changes in the envelope of the output voltage signals from the first and second receiving coils.A characteristic diagram showing the relationship between the maximum amplitude, displacement, and lateral force of the output voltage signal.A plan view of the lace portion according to a modified example of the first embodiment.A perspective view of the lace portion according to a modified example of the first embodiment.A plan view of the lace portion according to a modified example of the first embodiment.A diagram showing the race section, detection unit, and processing unit according to the second embodiment.A diagram showing the changes in the envelope of the output voltage of each detection unit.A diagram showing the race section, detection unit, and processing unit according to the third embodiment.A diagram showing the race section and detection unit according to the fourth embodiment.A longitudinal cross-sectional view of the wheel according to the fifth embodiment.A longitudinal cross-sectional view of the wheel according to the sixth embodiment. <First Embodiment> Hereinafter, a first embodiment of the vehicle detection device according to the present invention will be described with reference to the drawings. The detection device of this embodiment is configured to calculate the lateral force acting on a wheel (drive wheel) equipped with an in-wheel motor. The vehicle is, for example, a four-wheeled passenger vehicle having two front wheels and two rear wheels. However, the vehicle is not limited to this, and may be a vehicle other than a four-wheeled vehicle, such as a two-wheeled vehicle. Furthermore, the use of the vehicle is not limited to passenger use. As shown in Figure 1, the wheel comprises a wheel 10 and an in-wheel motor 20. The wheel 10 includes a cylindrical rim portion 11 and a disc portion 12 on a circular disc located at the outer end of the rim portion 11 in the vehicle width direction. A tire 13 is attached to the outer circumference of the rim portion 11. The in-wheel motor 20 is housed in the inner space of the wheel 10, surrounded by the rim portion 11 and the disc portion 12, and provides rotational power to the