Railway condition monitoring sensor device and method for monitoring the condition of a railway bearing

1. A railway condition monitoring sensor device configured to be attached to a railway bearing of a railway vehicle comprising:

at least one vibration sensor;

means for detecting a movement of the railway vehicle along a direction of travel;

a control unit for processing at least the signals obtained by the vibration sensor to determine a health parameter indicating the state of health of the bearing, wherein the control unit is configured to trigger measurements based on at least one predetermined condition; and

a wireless communication device for communicating the health parameter to a monitoring and control server,

wherein the control unit is configured to be operated in an energy-saving sleep mode and in at least one activated mode,

wherein the control unit is configured to switch from the sleep mode to the at least one activated mode upon detecting that a predetermined set of conditions is met, and

wherein the predetermined set of conditions includes the condition that the means for detecting the movement detects that the railway vehicle is moving along a direction of travel.

2. The railway condition monitoring sensor device according to claim 1 , wherein the wireless communication device is a mobile telecommunication module.

3. The railway condition monitoring sensor device according to claim 2 , wherein the control unit is configured to classify the health parameter by comparing the health parameter with at least one threshold value and to immediately communicate the health parameter to the monitoring and control server only when the health parameter is equal or larger than the at least one threshold value.

4. The railway condition monitoring sensor device according to claim 3 , wherein the control unit is configured to classify the health parameter into at least three severity classes by comparing the health parameter with at least a lower and an upper threshold value and to:

switch into the sleep mode when the value of the health parameter is equal to or lower than a lower threshold value;

continue collecting data and determining the health parameter if the value of the health parameter is between the lower threshold value and an upper threshold value and to;

immediately communicate the health parameter to the monitoring and control server when the health parameter is equal to or larger than the at least one threshold value.

5. The railway condition monitoring sensor device according to claim 4 , wherein the means for detecting a movement of the railway vehicle is the vibration sensor.

6. The railway condition monitoring sensor device according to claim 1 , wherein the means for detecting a movement of the railway vehicle is a 3-axis accelerometer.

7. The railway condition monitoring sensor device according claim 1 , further comprising a GNSS module for detection of a geographical location, wherein the control unit is configured to determine the health parameter if the geographical location is within a predetermined range.

8. A railway condition monitoring system comprising:

at least one railway condition monitoring sensor device having;

at least one vibration sensor;

means for detecting a movement of the railway vehicle along a direction of travel;

a control unit for processing at least the signals obtained by the vibration sensor to determine a health parameter indicating the state of health of the bearing, wherein the control unit is configured to trigger measurements based on at least one predetermined condition; and

a wireless communication device for communicating the health parameter to a monitoring and control server,

wherein the control unit is configured to be operated in an energy-saving sleep mode and in at least one activated mode,

wherein the control unit is configured to switch from the sleep mode to the at least one activated mode upon detecting that a predetermined set of conditions is met, and

wherein the predetermined set of conditions includes the condition that the means for detecting the movement detects that the railway vehicle is moving along a direction of travel, and

a monitoring and control server configured to receive and process messages including the health parameter of the bearing received from the wireless communication device,

wherein the monitoring and control server is configured to generate maintenance information relating to the bearing based on the health parameter.

9. A method for monitoring the condition of a railway bearing and/or of a railway track using a railway condition monitoring sensor device comprising:

providing at least one vibration sensor, a means for detecting a movement of the railway vehicle along a direction of travel, a control unit for processing at least the signals obtained by the vibration sensor to determine a health parameter indicating the state of health of the bearing, wherein the control unit is configured to trigger measurements based on at least one predetermined condition, and a wireless communication device for communicating the health parameter to a monitoring and control server, wherein the control unit is configured to be operated in an energy-saving sleep mode and in at least one activated mode, wherein the control unit is configured to switch from the sleep mode to the activated mode upon detecting that a predetermined set of conditions is met, and wherein the predetermined set of conditions includes the condition that the means for detecting the movement detects that the railway vehicle is moving along a direction of travel,

operating the control unit in an energy-saving sleep mode and in at least one activated mode,

wherein switching the control unit from the sleep mode to the at least one activated mode upon detecting that a predetermined set of conditions is met, and

wherein the predetermined set of conditions includes the condition that the railway vehicle is moving along a direction of travel.