Method and apparatus for detecting and signalling derailment conditions in a railway vehicle
First Claim
1. A method of detecting and signalling a derailment condition of a railway vehicle wheel, comprising the steps of:
- providing vibration sensor means (3) associated with at least a wheel (1) of a railway vehicle for generating a vibration impulsive signal (V) indicative of the vibration of the wheel;
receiving the vibration signal (V) by means of an electronic processing unit (E);
generating, based on the vibration signal (V), an impulsive surveillance signal (S);
comparing the instant value of the surveillance signal (S) with a reference threshold value (T); and
automatically generating an alarm signal (A) when the instant value of the surveillance signal (S) reaches or exceeds said reference threshold value (T);
characterised in that the instant value of the impulsive surveillance signal (S) is increased in a manner correlated to the amplitude of each vibration impulse (I) and decreased in accordance with a predetermined law after each vibration impulse.
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Accused Products
Abstract
A wheel (1) of a railway vehicle is associated with a vibration sensor (3) for supplying a vibration impulsive signal (V), indicative of the vibration of the wheel, to an electronic processing unit (E). This generates, based on the vibration signal (V), an impulsive surveillance signal (S) the instant value of which is increased in a manner correlated to the amplitude of each vibration impulse (I) and decreased in accordance with a predetermined law after each vibration impulse. The processing unit (E) compares the instant value of the surveillance signal (S) with a reference threshold value (T) and automatically generates an alarm signal (A) when the instant value of the surveillance signal (S) reaches or exceeds the reference threshold value (T).
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Citations
10 Claims
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1. A method of detecting and signalling a derailment condition of a railway vehicle wheel, comprising the steps of:
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providing vibration sensor means (3) associated with at least a wheel (1) of a railway vehicle for generating a vibration impulsive signal (V) indicative of the vibration of the wheel;
receiving the vibration signal (V) by means of an electronic processing unit (E);
generating, based on the vibration signal (V), an impulsive surveillance signal (S);
comparing the instant value of the surveillance signal (S) with a reference threshold value (T); and
automatically generating an alarm signal (A) when the instant value of the surveillance signal (S) reaches or exceeds said reference threshold value (T);
characterised in that the instant value of the impulsive surveillance signal (S) is increased in a manner correlated to the amplitude of each vibration impulse (I) and decreased in accordance with a predetermined law after each vibration impulse. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for detecting and signalling a derailment condition of a railway vehicle wheel, the apparatus comprising:
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vibration sensor means (3), associated with at least a wheel (1) of a railway vehicle, for generating a vibration impulsive signal (V) indicative of the vibration of the wheel; and
processing means for;
receiving the vibration signal (V);
generating, based on the vibration signal (V), an impulsive surveillance signal (S);
comparing the instant value of the surveillance signal (S) with a reference threshold value (T); and
automatically generating an alarm signal (A) when the instant value of the surveillance signal (S) reaches or exceeds said reference threshold value (T);
characterised in that said processing means comprise means for increasing the instant value of the surveillance signal (S) in a manner correlated to the amplitude of each vibration impulse (I) and decreasing said instant value in accordance with a predetermined law after each vibration impulse. - View Dependent Claims (8, 9, 10)
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Specification