Aktiebolaget Skf

Elena Pinto

Victor Martinez

A method of determining the geographical position of a rail vehicle travelling on a defined route that has a number of known stopping locations separated by known distances. The method comprises steps of: recording a linear speed signal of the vehicle; processing the linear speed signal to identify a plurality of preceding stationary periods when linear speed equals zero, including a last stationary period, and to calculate the distance traveled between the plurality of preceding stationary periods; comparing the calculated distances with the known distances between stopping locations, to match the last identified stationary period to a corresponding one of the known stopping locations and identify the direction of travel of the rail vehicle; and determining the geographical position of the rail vehicle by processing a portion of the speed signal obtained since the last identified stationary period, to calculate the distance traveled from the corresponding stopping location.

Position determination method and system

The present invention defines a method of determining a vertical profile signal of a rail surface that includes, obtaining a vertical acceleration signal acc, by measuring vertical acceleration of a bogie of a rail vehicle that runs on the rail surface; processing the vertical acceleration signal to obtain a vertical velocity signal; determining the vertical profile signal of the rail surface, by using the vertical acceleration signal and the vertical velocity signal as inputs to a simulation model of the bogie, the model having an unsprung mass connected to a sprung mass, the vertical acceleration signal accrepresents the vertical acceleration of the unsprung mass; and measuring a linear velocity signal of the rail vehicle, the linear velocity signal is used in the step of determining to convert the vertical profile signal from the time domain to the distance domain.

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Alcorcón-Madrid, Spain

Elena Pinto