Method and apparatus for judging road surface conditions and program for judging road surface conditions
First Claim
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1. A method for judging road surface conditions on which a four-wheel-drive vehicle is running, comprising the steps of:
- obtaining wheel speed rotational information of driving wheels of the four-wheel-drive vehicle during running from wheel speed detecting means,receiving GPS radio waves to calculate positional information of the four-wheel-drive vehicle,calculating velocity and acceleration of the vehicle from the positional information,calculating a slip rate of the wheels of the vehicle from the wheel speed information and velocity of the vehicle,calculating a linear relationship between vehicle acceleration and the slip rate,judging road surface conditions during running from a gradient of the linear relationship, andproviding an output of the road surface conditions.
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Abstract
A method, apparatus and program for judging road surface conditions on which a vehicle is running. The method, apparatus and program includes the steps of: obtaining wheel speed rotational information of driving wheels of the vehicle during running from wheel speed detectors, receiving GPS radio waves to calculate positional information, and judging road surface conditions during running on the basis of a relationship between the wheel speed rotational information and the positional information. Conditions of road surfaces on which a vehicle is running can be accurately judged.
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Citations
18 Claims
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1. A method for judging road surface conditions on which a four-wheel-drive vehicle is running, comprising the steps of:
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obtaining wheel speed rotational information of driving wheels of the four-wheel-drive vehicle during running from wheel speed detecting means, receiving GPS radio waves to calculate positional information of the four-wheel-drive vehicle, calculating velocity and acceleration of the vehicle from the positional information, calculating a slip rate of the wheels of the vehicle from the wheel speed information and velocity of the vehicle, calculating a linear relationship between vehicle acceleration and the slip rate, judging road surface conditions during running from a gradient of the linear relationship, and providing an output of the road surface conditions. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11, 12)
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7. An apparatus for judging road surface conditions on which a four-wheel-drive vehicle is running, comprising:
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wheel speed detecting means which detect wheel speed rotational information of tires of driving wheels of the four-wheel-drive vehicle, a GPS device which receives GPS radio waves and calculates positional information, means for calculating velocity and acceleration of the vehicle from the positional information, means for calculating a slip rate of the wheels of the vehicle from the wheel speed information and velocity of the vehicle, means for calculating a linear relationship between vehicle acceleration and the slip rate, means for judging a road surface condition during running from a gradient of the linear relationship, and a device for providing an output of the road surface conditions. - View Dependent Claims (8, 9)
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13. A computer-readable medium storing a program for judging road surface conditions on which a four-wheel-drive vehicle is running, the program, when executed by processor, carrying out a method comprising the steps of:
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obtaining wheel speed rotational information of driving wheels of the four-wheel-drive vehicle during running from wheel speed detecting means, receiving GPS radio waves to calculate positional information of the four-wheel-drive vehicle, calculating information on velocity and acceleration of the vehicle from the positional information, calculating a slip rate of the wheels of the vehicle from the wheel speed information and velocity of the vehicle, calculating a linear relationship between vehicle acceleration and the slip rate, judging road surface conditions during running from a gradient of the linear relationship, and providing an output of the road surface conditions. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification