Method of analyzing stopping distance performance efficiency
First Claim
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1. A method for determining efficiency of a tire-vehicle-ABS system comprising the steps of:
- (A) providing a vehicle with a wheel;
(B) providing the vehicle with a first ABS controller that is operable to control braking of the wheel;
(C) providing a first tire made according to a first specification;
(D) defining a first tire-vehicle-ABS system as the combination of the vehicle, the first ABS controller and the first tire;
(E) inflating the first tire to a first inflation pressure;
(F) collecting mu-slip data for the first tire at the first inflation pressure;
(G) providing the first tire at the first inflation pressure on the wheel;
(H) performing a first stopping distance test on the first tire-vehicle-ABS system under the conditions of step (G) to create stopping distance data;
(I) inflating the first tire to a second inflation pressure;
(J) collecting mu-slip data for the first tire at the second inflation pressure;
(K) providing the first tire at the second inflation pressure on the wheel;
(L) performing a second stopping distance test on the first tire-vehicle-ABS system under the conditions of step (K) to create stopping distance data;
(M) using the collected mu-slip data from the first tire at the first and second inflation pressures to;
(1) determine peak mu and slip ratio at peak mu; and
, (2) create a data curve of normalized mu versus time; and
,(N) using the data curve of normalized mu versus time to calculate efficiency of the first tire-vehicle-ABS system.
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Abstract
Provided is a method for determining the efficiency of an ABS controller. The method may comprise performing a first test on a first tire using a first ABS controller at a first inflation pressure, gathering a first data set, using a digital computer to generate a first function from the first data set, and using a digital computer to calculate a first efficiency based on the first function. The first data set may comprise data about the first test. The first function may describe normalized mu versus time for a first time period.
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13 Claims
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1. A method for determining efficiency of a tire-vehicle-ABS system comprising the steps of:
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(A) providing a vehicle with a wheel; (B) providing the vehicle with a first ABS controller that is operable to control braking of the wheel; (C) providing a first tire made according to a first specification; (D) defining a first tire-vehicle-ABS system as the combination of the vehicle, the first ABS controller and the first tire; (E) inflating the first tire to a first inflation pressure; (F) collecting mu-slip data for the first tire at the first inflation pressure; (G) providing the first tire at the first inflation pressure on the wheel; (H) performing a first stopping distance test on the first tire-vehicle-ABS system under the conditions of step (G) to create stopping distance data; (I) inflating the first tire to a second inflation pressure; (J) collecting mu-slip data for the first tire at the second inflation pressure; (K) providing the first tire at the second inflation pressure on the wheel; (L) performing a second stopping distance test on the first tire-vehicle-ABS system under the conditions of step (K) to create stopping distance data; (M) using the collected mu-slip data from the first tire at the first and second inflation pressures to;
(1) determine peak mu and slip ratio at peak mu; and
, (2) create a data curve of normalized mu versus time; and
,(N) using the data curve of normalized mu versus time to calculate efficiency of the first tire-vehicle-ABS system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification