Dump valve operational fault-determination system

• US 5,124,988 A
• Filed: 06/25/1990
• Issued: 06/23/1992
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Westinghouse Air Brake Technologies Corporation
• Original Assignee: Westinghouse Air Brake Technologies Corporation
• Inventors: Wood, James A., Drake, John W.
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): HUA, LY
• Application Number:
  US07/543,504
• Time in Patent Office: 729 Days
• Field of Search: 371/15.1, 371/29.1, 371/57.1, 303/3, 303/15, 303/92, 303/95, 364/426.02, 364/426.01
• US Class Current: 714/47.3
• CPC Class Codes: G01R 31/008 on air- or spacecraft, railway rolling stock or sea-going vessels

Abstract

A dynamic diagnostic operational dump valve fault-detection system including a first logic network connected to a release reset circuit and to an applied reset circuit, the release reset circuit connected to a release timer circuit and a release flag circuit as well as to a release pressure check circuit, the applied reset circuit connected to an applied timer circuit and to an applied flag circuit as well as to an applied pressure check circuit, the release timer circuit and the release flag circuit connected to a second logic network and to a third logic network, the applied timer circuit and the applied flag circuit connected to the second logic network and to the third logic network, a magnet valve state comparison circuit connected to a fourth logic network, the third and the fourth logic network connected to an error output circuit for recording and displaying a dump valve failure.

Claims

1. A dynamic diagnostic operational dump valve fault-detection system comprising, a first logic network means being connected to a release reset circuit means and to an applied reset circuit means, said release reset circuit means being connected to a release timer circuit means and a release flag circuit means as well as to a release pressure check circuit means, said applied reset circuit means being connected to an applied timer circuit means and to an applied flag circuit means as well as to an applied pressure check circuit means, said release timer circuit means and said release flag circuit means being connected to a second logic network means and to a third logic network means, said applied timer circuit means and said applied flag circuit means being connected to said second logic network means and to said third logic network means, a magnet valve state comparison circuit means being connected to a fourth logic network means, said third and fourth logic network means being connected to an error output circuit means for recording and displaying a dump valve failure.

2. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said first logic network means includes a plurality of AND gates.

3. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 2, wherein each of said plurality of AND gates is a two-input circuit.

4. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said second logic network means includes a plurality of AND gates.

5. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 4, wherein each of said plurality of AND gates is a two-input circuit.

6. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said third logic network means includes a plurality of AND gates.

7. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 6, wherein each of said plurality of AND gates is a two-input circuit.

8. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said fourth logic network means includes an AND gate.

9. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 8, wherein said AND gate is a two-input circuit.

10. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said first logic network means includes at least five two-input AND gate circuits.

11. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 10, wherein a first AND gate circuit of said five two-input AND gate circuits has one logic input signal representative of a previous magnet valve condition and has another logic input signal representative of the present magnet valve condition.

12. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 11, wherein a second AND gate circuit of said five two-input AND gate circuits has one logic input signal corresponding to an air brake cylinder pressure of a vehicle and has another logic input signal supplied by said first AND gate circuit.

13. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 12, wherein a third AND gate circuit of said five two-input AND gate circuits has one logic input signal proportional to an electric force motor current of the vehicle and has another logic input signal supplied by said first AND gate circuit.

14. The dynamic diagnostic operational dump valve fault detection system as defined in claim 13, wherein a fourth AND gate circuit of said five two-input AND gate circuits has one logic input signal representing the present status of a brake cylinder transducer of the vehicle and has another logic input signal supplied by said second AND gate circuit.

15. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 14, wherein a fifth AND gate circuit of said five two-input circuits has one logic input signal represent the present status of the brake cylinder transducer of the vehicle and has another logic input signal supplied by said third AND gate circuit.

16. The dynamic diagnostic operational dump valve fault detection system as defined in claim 1, wherein said second logic network means includes at least two two-input AND gate circuits.

17. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said third logic network means includes at least four two-input AND gate circuits.

18. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said fourth logic circuit means includes at least one two-input AND gate circuit.

19. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 1, wherein said magnet valve state comparison circuit includes one input signal corresponding to an air brake cylinder pressure of a vehicle and has another input signal corresponding to the status of a magnet valve coil feedback.

20. The dynamic diagnostic operational dump valve fault-detection system as defined in claim 19, wherein said fourth logic network includes at least one two-input AND gate circuit which has one logic input signal supplied by said magnet valve comparison state comparison circuit and has another logic input signal representative of the highest axle speed of a vehicle.

21. Dump valve operational fault-determination arrangement comprising, a first multiple-stage AND logic network for receiving a plurality of logical input signals representative of various operating conditions of a railway vehicle, said first multiple-stage AND logic network supplying a logic output signal to a release reset circuit and supplying a logic output signal to an applied reset circuit, said release reset circuit is connected to a release timer circuit and to a release flag circuit, said applied reset circuit is connected to an applied timer circuit and to an applied flag circuit, said release timer circuit and said release flag circuit supplying a logic input signal to a second multiple-stage AND logic network and to a third multiple-stage AND logic network, said applied timer circuit and said applied flag circuit supplying a logic input signal to said second multiple-stage AND logic network and to said third multiple-stage AND logic network, said second multiple-stage AND logic network supplying a logic input signal to a release pressure check circuit which supplies a reset signal to said release flag circuit and supplying a logic input signal to an applied pressure check circuit which supplies a reset signal to said applied flag circuit, said third multiple-stage AND logic network and a single-stage AND logic network connected to an error output circuit which outputs an error signal to record and display a dump valve failure.