Excavating
Patent
1990-06-25
1992-06-23
Smith, Jerry
Excavating
303 95, 303 92, 36442602, 371 291, G01R 3128
Patent
active
051249880
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.
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patent: 4709341 (1987-11-01), Matsuda
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patent: 4843557 (1989-06-01), Ina et al.
patent: 4972145 (1990-11-01), Wood et al.
patent: 4979391 (1990-12-01), Drake et al.
patent: 4999779 (1991-03-01), Wood et al.
Drake John W.
Wood James A.
Hua Ly V.
Smith Jerry
Sotak J. B.
Westinghouse Air Brake Company
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