Method for adjusting braking parameters of a train to account for train characteristic parameter variations
First Claim
1. A method of adjusting one or more of braking parameters used in a braking function to control braking of a train, comprising:
- determining an adjustment factor based on a joint stopping distance probability distribution, the joint stopping distance probability distribution representing the composite effect on stopping distance of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, wherein the determining the adjustment factor comprises applying a probability threshold to the joint stopping distance probability distribution to determine a safe braking offset distance, and calculating the adjustment factor based on the safe braking offset distance; and
applying the adjustment factor to each of the one or more of braking parameters.
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Accused Products
Abstract
A method of adjusting one or more of braking parameters used in a braking function to control braking of a train includes determining an adjustment factor based on a joint stopping distance probability distribution, the joint stopping distance probability distribution representing the composite effect on stopping distance of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, and applying the adjustment factor to each of the one or more of braking parameters. Also, a method of adjusting braking parameters that includes determining an adjustment factor based on a nominal value, a worst case limit value and a best case limit value of each of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, and applying the adjustment factor to each of the one or more of braking parameters.
13 Citations
18 Claims
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1. A method of adjusting one or more of braking parameters used in a braking function to control braking of a train, comprising:
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determining an adjustment factor based on a joint stopping distance probability distribution, the joint stopping distance probability distribution representing the composite effect on stopping distance of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, wherein the determining the adjustment factor comprises applying a probability threshold to the joint stopping distance probability distribution to determine a safe braking offset distance, and calculating the adjustment factor based on the safe braking offset distance; and applying the adjustment factor to each of the one or more of braking parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A train-borne component of a positive train control system comprising an on-board computer for a train, the on-board computer being programmed to control braking of the train using one or more of braking parameters by:
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applying an adjustment factor to each of the one or more of braking parameters to obtain one or more adjusted braking parameters, the adjustment factor being based on a joint stopping distance probability distribution, the joint stopping distance probability distribution representing the composite effect on stopping distance of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, wherein the adjustment factor is determined by applying a probability threshold to the joint stopping distance probability distribution to determine a safe braking offset distance, and calculating the adjustment factor based on the safe braking offset distance; and controlling braking of the train in the on-board computer using the one or more adjusted braking parameters. - View Dependent Claims (9, 10, 11, 12)
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13. A method adjusting one or more of braking parameters used in a braking function to control braking of a train, comprising:
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determining an adjustment factor based on a nominal value, a worst case limit value and a best case limit value of each of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, wherein the determining the adjustment factor comprises determining a joint stopping distance probability distribution using the nominal value, the worst case limit value and the best case limit value of each the predetermined train characteristic parameters, the joint stopping distance probability distribution representing the composite effect on stopping distance of the predetermined train characteristic parameters, and wherein the determining the adjustment factor comprises applying a probability threshold to the joint stopping distance probability distribution to determine a safe braking offset distance, and calculating the adjustment factor based on the safe braking offset distance; and applying the adjustment factor to each of the one or more of braking parameters. - View Dependent Claims (14, 15)
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16. A train-borne component of a positive train control system comprising an on-board computer for a train, the on-board computer being programmed to control braking of the train using one or more of braking parameters by:
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applying an adjustment factor to each of the one or more of braking parameters to obtain one or more adjusted braking parameters, the adjustment factor being based on a nominal value, a worst case limit value and a best case limit value of each of a plurality of predetermined train characteristic parameters, each of the predetermined train characteristic parameters being variable, wherein the adjustment factor is based on a joint stopping distance probability distribution that is determined using the nominal value, the worst case limit value and the best case limit value of each the predetermined train characteristic parameters, the joint stopping distance probability distribution representing the composite effect on stopping distance of the predetermined train characteristic parameters, wherein the adjustment factor is determined by applying a probability threshold to the joint stopping distance probability distribution to determine a safe braking offset distance, and calculating the adjustment factor based on the safe braking offset distance; and controlling braking of the train in the on-board computer using the one or more adjusted braking parameters. - View Dependent Claims (17, 18)
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Specification