Vehicle Drive Control System and Sensor Unit and Tire
First Claim
1. A vehicle drive control system including control means for driving each of drive actuators for an engine throttle, steering and brake according to a result of sensing a vehicle driving operation state to perform stability control during running of a vehicle, the system characterized by comprising:
- a plurality of sensor sections having an acceleration sensor, disposed in each 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 sensing at least one of a first acceleration generated in association with rotation of the tire 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 sensed first acceleration and second acceleration to generate a ground contact pattern determination signal of each tire, for each sensor section;
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;
ground contact pattern specifying means for specifying a ground contact pattern of each tire with respect to running road surface 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 ground contact pattern information; and
means for performing the control of correcting the drive of a predetermined drive actuator from among the drive actuators based on the tire ground contact pattern of each tire outputted from the ground contact pattern specifying means.
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Accused Products
Abstract
There is provided a vehicle drive control system performing the stability control of a vehicle by highly accurately and easily sensing accelerations generated in each tire and sensing a tire ground contact pattern, a sensor unit thereof and a tire. 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 and output the information to a stability control unit 700. The 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
19 Claims
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1. A vehicle drive control system including control means for driving each of drive actuators for an engine throttle, steering and brake according to a result of sensing a vehicle driving operation state to perform stability control during running of a vehicle, the system characterized by comprising:
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a plurality of sensor sections having an acceleration sensor, disposed in each 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 sensing at least one of a first acceleration generated in association with rotation of the tire 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 sensed first acceleration and second acceleration to generate a ground contact pattern determination signal of each tire, for each sensor section;
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;
ground contact pattern specifying means for specifying a ground contact pattern of each tire with respect to running road surface 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 ground contact pattern information; and
means for performing the control of correcting the drive of a predetermined drive actuator from among the drive actuators based on the tire ground contact pattern of each tire outputted from the ground contact pattern specifying means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18)
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9. A sensor unit with an acceleration sensor disposed in a tire of a vehicle, sensing an acceleration generated in association with running of the vehicle, the unit characterized by comprising:
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the acceleration sensor sensing at least one of a first acceleration generated in association with rotation of the tire in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation;
means for converting the sensing result of the acceleration sensor into an electrical signal and performing outputting;
means for eliminating a gravity acceleration component from at least one electrical signal of the sensed 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;
means for converting the low frequency component and high frequency component separated by the separation means into a digital value; and
means for transmitting digital information including the digital value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 19)
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Specification