公开(公告)号：DE3107144A1

公开(公告)日：1982-01-07

申请号：DE3107144

申请日：1981-02-26

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W WOODWARD

IPC: G04F10/00 ,  B61K9/06 ,  G04F5/00 ,  G01D21/00 ,  B61L1/16

公开(公告)号：CA1168726A

公开(公告)日：1984-06-05

申请号：CA385821

申请日：1981-09-14

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W WOODWARD

IPC: B61K11/00 ,  B61L1/08 ,  G08B1/08

Abstract: RAILROAD CAR WHEEL DETECTOR 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：CA1131730A

公开(公告)日：1982-09-14

申请号：CA350947

申请日：1980-04-30

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W WOODWARD

IPC: B61K9/06

Abstract: A system is provided for determining whether a railway car passing a sensing station is a freight car. The system utilizes wheel trips along the track at the sensing station to determine the spacing between axles of the car. If the spacing between axles is determined to fall between slightly more than 4' - 5" to slightly less than 6' - 1" the car is presumed to be a freight car.

公开(公告)号：DE3148157A1

公开(公告)日：1982-08-05

申请号：DE3148157

申请日：1981-12-05

Applicant: SERVO CORP OF AMERICA

Inventor： SANVILLE W WOODWARD

IPC: B61K11/00 ,  B61L1/08 ,  B61L1/16

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：DE3115872A1

公开(公告)日：1982-05-06

申请号：DE3115872

申请日：1981-04-21

Applicant: SERVO CORP OF AMERICA

Inventor： BAMBARA JOSEPH E ,  SANVILLE W WOODWARD

IPC: B61L1/10 ,  B61K9/06 ,  G01M17/08 ,  B61K9/04

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：DE3111297A1

公开(公告)日：1982-02-18

申请号：DE3111297

申请日：1981-03-23

Applicant: SERVO CORP OF AMERICA

Inventor： BAMBARA JOSEPH E ,  SANVILLE W WOODWARD

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

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.