公开(公告)号：AU6883281A

公开(公告)日：1981-10-08

申请号：AU6883281

申请日：1981-03-27

Applicant: SERVO CORP OF AMERICA

Inventor： BAMBARA J E ,  SANVILLE W W

IPC: B61K9/00 ,  A61B17/70 ,  A61B17/86 ,  A61B19/00 ,  A61F2/00 ,  A61F2/30 ,  A61F2/44 ,  B61K9/06 ,  B61L1/10 ,  B61K9/04

Abstract: An improved method and circuit is provided for processing waveforms from a railway car heat signal to eliminate spurious signals and to differentiate between roller bearings and friction bearings in a railroad hot box detector system. The waveforms generated by passing bearings are discretely sampled and spurious signals are eliminated by considering only those signals that fall within the crossing points of a threshold value. Discrimination between roller bearings and friction bearings is obtained by determining the ratio of the sum of the discrete values of the amplitude of the waveform within a first set of samples between the crossing points to the sum of the discrete values of the amplitude of the waveform within a second set of samples between the crossing points.

公开(公告)号：AU6791281A

公开(公告)日：1981-09-03

申请号：AU6791281

申请日：1981-02-27

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W W

IPC: G04F10/00 ,  B61K9/06 ,  G04F5/00

Abstract: A speed independent system is used for obtaining a preselected number of samples from an object moving along a fixed path, such as a railroad train passing through a sensing zone along the section of track. The sensing zone is defined by a pair of wheel sensors. Upstream of the sensing zone a third sensor is positioned. The distance between the third sensor and the closer of the pair of sensors comprises a reference distance which is the length of the sensing zone multiplied by a known multiple. The time for the train to pass through the reference distance is obtained and then divided by a divisor comprising the product of the known multiple and the desired number of samples to obtain a single interval. During the time the train passes through the sensing zone consecutive intervals are counted off to obtain the desired number of samples.

公开(公告)号：SE8101088L

公开(公告)日：1981-08-29

申请号：SE8101088

申请日：1981-02-18

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W W

IPC: G04F10/00 ,  B61K9/06 ,  G04F5/00 ,  B61K9/04

公开(公告)号：SE8200092L

公开(公告)日：1982-07-15

申请号：SE8200092

申请日：1982-01-11

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W W

IPC: B61L1/08 ,  B61K11/00 ,  B61L3/12

Abstract: A method is provided for determining whether an output signal from a magnetic railway wheel detector is produced by the actual passage of a wheel over the transducer. The output signal is compared with an amplitude threshold value and the time period between the zero crossing point and the time at which the signal attains amplitude threshold is compared with a time threshold level. The thresholds are set as a function of the speed of the train. Unless the thresholds are exceeded the output signal is disregarded.

公开(公告)号：SE8102635L

公开(公告)日：1981-10-29

申请号：SE8102635

申请日：1981-04-27

Applicant: SERVO CORP OF AMERICA

Inventor： BAMBARA J E ,  SANVILLE W W

IPC: B61L1/10 ,  B61K9/06 ,  G01M17/08

Abstract: A railroad car hot box detector system is provided which includes a variable circuit means for processing the heat signal generated by an infra-red detector viewing a sensing zone along a section of track. The system includes a conditioning circuit which determines one or more conditions of the train (such as the wheel speed or temperature of the car bottom) and uses that information to vary the processing circuit to enable the heat signal to be processed optimally for the detected condition.

公开(公告)号：SE8102027L

公开(公告)日：1981-10-01

申请号：SE8102027

申请日：1981-03-30

Applicant: SERVO CORP OF AMERICA

Inventor： BAMBARA J E ,  SANVILLE W W

IPC: A61B17/70 ,  A61B17/86 ,  A61B19/00 ,  B61K9/00 ,  A61F2/00 ,  A61F2/30 ,  A61F2/44 ,  B61K9/06 ,  B61L1/10 ,  B61K9/04

Abstract: An improved method and circuit is provided for processing waveforms from a railway car heat signal to eliminate spurious signals and to differentiate between roller bearings and friction bearings in a railroad hot box detector system. The waveforms generated by passing bearings are discretely sampled and spurious signals are eliminated by considering only those signals that fall within the crossing points of a threshold value. Discrimination between roller bearings and friction bearings is obtained by determining the ratio of the sum of the discrete values of the amplitude of the waveform within a first set of samples between the crossing points to the sum of the discrete values of the amplitude of the waveform within a second set of samples between the crossing points.