Method of determining the speed of railway vehicles, in particular those with bogies

US5757178A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Peter Luehrs · Braunschweig, DE
• Gerhard Wilms · Braunschweig, DE

Key dates

• Filing date: Dec 20, 1995
• Grant date: May 26, 1998
• Expiry date: Dec 20, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/489
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to exclude disturbing influences in the determination of the axle-related speeds of railway vehicles, the signals generated by the passage of the last axle of a bogie are discerned from spurious signals. This is carried out by specifying a time window within which the last axle of a bogie must have passed the measuring zone. Those signals separated by about the same offset time as the time between the passage of the first axle of the first and second sensors are used for the determination of the speed of this last axle. An additional integrity check further increases the reliability signal identification by comparing the sum of certain measured time values which have been detected by the two sensors of the measuring zone. The assignment of the time values respectively to the pulse centers of the event indication eliminates different response tolerances of the sensors due to the lateral offset of the vehicle wheels with respect to the rails in the region of the sensors. The speed of railway vehicles may thus be reliably and continuously determined upon passing a measuring zone, even when the sensors generate spurious signals due to disturbances such as electromagnetic rail …