Stability control apparatus and load measuring instrument for wheel supporting rolling bearing unit
First Claim
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1. A stability control apparatus, comprising:
- a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and
a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector;
wherein the controller includes;
a function of calculating a value that is changed in relation to a normal grip force supposedly applied to a contact face for the wheel, based on a speed signal indicating a running speed of the vehicle that is detected by a speed sensor, and a signal indicating an acceleration exerted on the vehicle that is detected by an acceleration sensor mounted on the vehicle, when there is no slippage for hampering the running stability of the vehicle on the contact face between each wheel and the road surface;
a function of comparing a value that is changed in relation to an actual grip force actually applied to the contact face for the wheel, which is obtained from a detection signal of the grip detector built into each wheel supporting rolling bearing unit, and the value that is changed in relation to the normal grip force; and
a function of making a control for keeping the stability of the vehicle, when the value that is changed in relation to the actual grip force and the value that is changed in relation to the normal grip force are different beyond a preset threshold value.
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Abstract
A stability control apparatus, includes: a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector.
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Citations
34 Claims
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1. A stability control apparatus, comprising:
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a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector; wherein the controller includes; a function of calculating a value that is changed in relation to a normal grip force supposedly applied to a contact face for the wheel, based on a speed signal indicating a running speed of the vehicle that is detected by a speed sensor, and a signal indicating an acceleration exerted on the vehicle that is detected by an acceleration sensor mounted on the vehicle, when there is no slippage for hampering the running stability of the vehicle on the contact face between each wheel and the road surface; a function of comparing a value that is changed in relation to an actual grip force actually applied to the contact face for the wheel, which is obtained from a detection signal of the grip detector built into each wheel supporting rolling bearing unit, and the value that is changed in relation to the normal grip force; and a function of making a control for keeping the stability of the vehicle, when the value that is changed in relation to the actual grip force and the value that is changed in relation to the normal grip force are different beyond a preset threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A stability control apparatus, comprising:
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a critical grip force measuring unit that measures a critical grip force of a wheel; an actual grip force measuring unit that measures an actual grip force actually supported by the wheel, a margin calculating unit calculates a degree of margin of the actual grip force to the critical grip force; and a controller that makes a control for keeping the running stability of the vehicle, based on the degree of margin calculated by the margin calculating unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A stability control apparatus in which the contraction of the components of a suspension device residing on the side where the distance between a vehicle body and the road surface is shorter is suppressed to restrain the vehicle body from being inclined with respect to the road surface, regardless of a load applied in the horizontal direction to the vehicle body, the apparatus comprising:
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a rolling bearing unit that supports freely rotatably the wheel to the vehicle body, the rolling bearing unit having a load measuring unit that measures a load; and a determining unit that determines whether or not the distance between the vehicle body and the road surface is shorter, based on the magnitude of the load. - View Dependent Claims (22, 23, 24, 25)
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26. A load measuring instrument for a wheel supporting rolling bearing unit, comprising:
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an outer race counterpart member having an outer raceway on an inner peripheral surface; an inner race counterpart member having an inner raceway on an outer peripheral surface, disposed concentrically with the outer race counterpart member on the inner diameter side of the outer race counter part member; a plurality of rolling elements provided with a contact angle between the inner raceway and the outer raceway; a revolving speed detection sensor for detecting the revolving speed of each rolling element; and a calculator for calculating a load applied between the outer race counterpart member and the inner race counterpart member based on a detection signal sent from the revolving speed detection sensor; wherein the calculator has, in addition to a function of calculating the load, a function of estimating a load applied between the outer race counterpart member and the inner race counterpart member, based on one or more state values selected from plural kinds of state values affecting the load, including a lateral acceleration applied to the vehicle body mounting the rolling bearing unit composed of the outer race counterpart member, the inner race counterpart member and the rolling elements, a yaw rate, a vehicle speed and a steering angle, and a function of self-learning a gain characteristic and a zero point in calculating the load based on the detection signal by comparing the estimated load and the load calculated based on the detection signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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Specification