Method for Adjusting Braking Parameters of a Train to Account for Train Characteristic Parameter Variations

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:

• 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;
• and
• controlling braking of the train in the on-board computer using the one or more adjusted braking parameters.

A method 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 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.

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:

• 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 be Eg variable;
• and
• controlling braking of the train in the on-board computer using the one or more adjusted braking parameters.