Tire Ground Contact Pattern Specifying Method And Apparatus Thereof
First Claim
1. A tire ground contact pattern specifying method for using a device to specify a ground contact pattern with respect to running road surface for a tire of a running vehicle, the device comprising:
- a sensor unit, disposed in a rotation mechanism section including a rotation body positioned in the vehicle body side, for securing a tire and allowing the tire to rotate and the tire, and having an acceleration sensor sensing at least one of a first acceleration generated in association with tire rotation in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation, and converting the sensing result into an electrical signal and performing outputting; and
pattern information storage means for associating a predetermined low frequency component and a predetermined high frequency component of a ground contact pattern determination signal with tire ground contact pattern information including at least information on tire ground contact area with respect to running road surface, and preliminarily storing the resultant information, the method characterized in that the device;
eliminates a gravity acceleration component from at least one electrical signal of the sensed first acceleration and second acceleration to generate the ground contact pattern determination signal;
separates the predetermined low frequency component and predetermined high frequency component of the ground contact pattern determination signal; and
specifies a tire ground contact pattern with respect to running road surface based on the low frequency component and high frequency component obtained by the separation and the information stored in the pattern information storage means.
1 Assignment
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Accused Products
Abstract
There is provided a tire ground contact pattern specifying method and an apparatus thereof for specifying a tire ground contact pattern usable to perform the stable control of a running vehicle. Using a sensor unit 100 mounted in each tire 2 of a vehicle 1, accelerations generated in X, Y and Z directions are sensed and at the same time, a low frequency noise component and high frequency noise component added to the Z axis direction acceleration signal are extracted. Digital values being the sensing result are transmitted as digital information to a monitor device 200 by radio wave. The monitor device 200 compares many pieces of tire ground contact pattern information preliminarily stored with the digital information to thereby specify a tire ground contact pattern. A stability control unit 700 performs, based on the acceleration values and the information on tire ground contact pattern obtained, the correction control of driving of a sub-throttle actuator 412 or a brake drive actuator 640.
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Citations
20 Claims
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1. A tire ground contact pattern specifying method for using a device to specify a ground contact pattern with respect to running road surface for a tire of a running vehicle, the device comprising:
- a sensor unit, disposed in a rotation mechanism section including a rotation body positioned in the vehicle body side, for securing a tire and allowing the tire to rotate and the tire, and having an acceleration sensor sensing at least one of a first acceleration generated in association with tire rotation in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation, and converting the sensing result into an electrical signal and performing outputting; and
pattern information storage means for associating a predetermined low frequency component and a predetermined high frequency component of a ground contact pattern determination signal with tire ground contact pattern information including at least information on tire ground contact area with respect to running road surface, and preliminarily storing the resultant information, the method characterized in that the device;eliminates a gravity acceleration component from at least one electrical signal of the sensed first acceleration and second acceleration to generate the ground contact pattern determination signal; separates the predetermined low frequency component and predetermined high frequency component of the ground contact pattern determination signal; and specifies a tire ground contact pattern with respect to running road surface based on the low frequency component and high frequency component obtained by the separation and the information stored in the pattern information storage means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 19, 20)
- a sensor unit, disposed in a rotation mechanism section including a rotation body positioned in the vehicle body side, for securing a tire and allowing the tire to rotate and the tire, and having an acceleration sensor sensing at least one of a first acceleration generated in association with tire rotation in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation, and converting the sensing result into an electrical signal and performing outputting; and
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8. A tire ground contact pattern specifying device specifying a ground contact pattern with respect to running road surface for a tire of a running vehicle, the device characterized by comprising:
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a sensor unit, disposed in a rotation mechanism section including a rotation body positioned in the vehicle body side, for securing a tire and allowing the tire to rotate and the tire, and having an acceleration sensor sensing at least one of a first acceleration generated in association with tire rotation in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation, and converting the sensing result into an electrical signal and performing outputting; means for eliminating a gravity acceleration component from at least one electrical signal of the first acceleration and second acceleration to generate a ground contact pattern determination signal; separation means for separating a predetermined low frequency component and a predetermined high frequency component of the ground contact pattern determination signal; pattern information storage means for associating tire ground contact pattern information including at least information on tire ground contact area with respect to running road surface and the low frequency component and high frequency component, and preliminarily storing the resultant information; and ground contact pattern specifying means for specifying a tire ground contact pattern based on the low frequency component and high frequency component obtained by the separation means and the information stored in the pattern information storage means, and outputting this tire ground contact pattern information. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification