Method and apparatus for predicting minimum stopping distance required to brake running vehicle
First Claim
1. A method of predicting a minimum stopping distance of a subject vehicle required to stop the subject vehicle by activation of a subject vehicle braking system thereof during running of the subject vehicle, comprising:
- a step of obtaining measurement data for each of at least one sample vehicle which is braked by a sample vehicle braking system thereof operated with its full braking capacity, said at least one sample vehicle including at least one of a vehicle different in type from said subject vehicle and a vehicle identical in type with said subject vehicle but different in specification from said subject vehicle, said sample vehicle braking system being one of a braking system different in type from said subject vehicle braking system and a braking system identical in type with said subject vehicle braking system, said measurement data including a weight of said each sample vehicle, a running speed of said each sample vehicle when said sample vehicle braking system of said each sample vehicle starts to be activated, a stopping distance through which said each sample vehicle has run to be stopped, and a radius of a tire of said each sample vehicle;
a step of obtaining at least one predicting equation on the basis of said measurement data in a statistical manner, said at least one predicting equation providing a predicted value of said minimum stopping distance on the basis of subject vehicle data for said subject vehicle, said subject vehicle data including a weight of said subject vehicle, a running speed of said subject vehicle when said subject vehicle braking system of said subject vehicle starts to be activated, and a radius of a tire of said subject vehicle; and
a step of calculating said predicted value of said minimum stopping distance of said subject vehicle, by substituting said subject vehicle data into one of said at least one predicting equation, so that said one predicting equation provides said predicted value of said minimum stopping distance.
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Abstract
A method of predicting a minimum stopping distance required to stop a subject vehicle by a braking system thereof, including: (a) a step of obtaining measurement data for each of at least one sample vehicle which is braked by a braking system thereof operated with its full braking capacity, the measurement data including a weight and a running speed of the sample vehicle, a stopping distance through which the sample vehicle has run to be stopped, a tire radius of the sample vehicle, and optionally a tire width of the sample vehicle; (b) a step of obtaining at least one predicting equation on the basis of the measurement data in a statistical manner, the equation providing a predicted value of the minimum stopping distance on the basis of a weight, a running speed and a tire radius of the subject vehicle, and optionally a tire width of the subject vehicle; and (c) a step of calculating the predicted value of the minimum stopping distance, by substituting the weight, the running speed, the tire radius of the running vehicle, and optionally the tire width of the subject vehicle, into one of the at least one predicting equation, so that the equation provides the predicted value of the minimum stopping distance.
102 Citations
26 Claims
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1. A method of predicting a minimum stopping distance of a subject vehicle required to stop the subject vehicle by activation of a subject vehicle braking system thereof during running of the subject vehicle, comprising:
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a step of obtaining measurement data for each of at least one sample vehicle which is braked by a sample vehicle braking system thereof operated with its full braking capacity, said at least one sample vehicle including at least one of a vehicle different in type from said subject vehicle and a vehicle identical in type with said subject vehicle but different in specification from said subject vehicle, said sample vehicle braking system being one of a braking system different in type from said subject vehicle braking system and a braking system identical in type with said subject vehicle braking system, said measurement data including a weight of said each sample vehicle, a running speed of said each sample vehicle when said sample vehicle braking system of said each sample vehicle starts to be activated, a stopping distance through which said each sample vehicle has run to be stopped, and a radius of a tire of said each sample vehicle; a step of obtaining at least one predicting equation on the basis of said measurement data in a statistical manner, said at least one predicting equation providing a predicted value of said minimum stopping distance on the basis of subject vehicle data for said subject vehicle, said subject vehicle data including a weight of said subject vehicle, a running speed of said subject vehicle when said subject vehicle braking system of said subject vehicle starts to be activated, and a radius of a tire of said subject vehicle; and a step of calculating said predicted value of said minimum stopping distance of said subject vehicle, by substituting said subject vehicle data into one of said at least one predicting equation, so that said one predicting equation provides said predicted value of said minimum stopping distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
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11. A method of predicting a decelerating section distance through which a subject vehicle runs while being decelerated by a subject vehicle braking system thereof operated with its full braking capacity from a first nominal speed to a second nominal speed which is lower than said first nominal speed but higher than zero, comprising:
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a step of obtaining measurement data for each of at least one sample vehicle which is driven at said first nominal speed and then braked by a sample vehicle braking system thereof operated with its full braking capacity, and which is driven at said second nominal speed and then braked by said sample vehicle braking system operated with its full braking capacity, said at least one sample vehicle including at least one of a vehicle different in type from said subject vehicle and a vehicle identical in type with said subject vehicle but different in specification from said subject vehicle, said sample vehicle braking system being one of a braking system different in type from said subject vehicle braking system and a braking system identical in type with said subject vehicle braking system, said measurement data including a weight of said each sample vehicle, a first running speed of said each sample vehicle when said sample vehicle braking system of said each sample vehicle starts to be activated during running of said each sample vehicle at said first nominal speed, a second running speed of said each sample vehicle when said sample vehicle braking system of said each sample vehicle starts to be activated during running of said each sample vehicle at said second nominal speed, a first stopping distance through which said each sample vehicle has run to be stopped where said each sample vehicle is driven at said first nominal speed, a second stopping distance through which said each sample vehicle has run to be stopped where said each sample vehicle is driven at said second nominal speed, and a radius of a tire of said each sample vehicle; a step of obtaining at least one first predicting equation and at least one second predicting equation on the basis of said measurement data in a statistical manner, said at least one first predicting equation providing a predicted value of a first minimum stopping distance required to stop said subject vehicle where said subject vehicle is driven at said first nominal speed, on the basis of first subject vehicle data for said subject vehicle, said first subject vehicle data including a weight of said subject vehicle, a first running speed of said subject vehicle when said subject vehicle braking system of said subject vehicle starts to be activated during running of said subject vehicle at said first nominal speed, and a radius of a tire of said subject vehicle, said at least one second predicting equation providing a predicted value of a second minimum stopping distance required to stop said subject vehicle where said subject vehicle is driven at said second nominal speed, on the basis of second subject vehicle data for said subject vehicle, said second subject vehicle data including said weight of said subject vehicle, a second running speed of said subject vehicle when said subject vehicle braking system of said subject vehicle starts to be activated during running of said subject vehicle at said second nominal speed, and said radius of said tire of said subject vehicle; a step of calculating said predicted value of said second minimum stopping distance, by substituting said second subject vehicle data into one of said at least one second predicting equation, so that said one second predicting equation provides said predicted value of said second minimum stopping distance; a step of calculating said predicted value of said first minimum stopping distance, by substituting said first subject vehicle data into one of said at least one first predicting equation, so that said one first predicting equation provides said predicted value of said first minimum stopping distance; and a step of obtaining said decelerating section distance by subtracting said predicted value of said second minimum stopping distance from said predicted value of said first minimum stopping distance. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus for predicting a minimum stopping distance of a subject vehicle required to stop the subject vehicle by activation of a braking system thereof during running of the subject vehicle, comprising:
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a data obtaining device for obtaining subject vehicle data for said subject vehicle, said subject vehicle data including a weight of said subject vehicle, a running speed of said subject vehicle, and a radius of a tire of said subject vehicle; a memory device for storing therein at least one predicting equation for providing a predicted value of said minimum stopping distance on the basis of said subject vehicle data; and a stopping-distance predicting device for providing said predicted value of said minimum stopping distance, by substituting said subject vehicle data into one of said at least one predicting equation. - View Dependent Claims (17, 18, 19, 20, 22, 23, 24, 25, 26)
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Specification