Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Reexamination Certificate
1999-10-28
2001-09-11
Dolinar, Andrew M. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
C073S114220, C701S107000
Reexamination Certificate
active
06286479
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to locomotives having an internal combustion engine, and, more particularly, to a system and method for predicting impending failures of a fuel delivery subsystem in the locomotive.
As will be appreciated by those skilled in the art, a locomotive is a complex electromechanical system comprised of several complex subsystems. Each of these subsystems, such as the fuel delivery subsystem, is built from components which over time fail. The ability to automatically predict failures before they occur in the locomotive subsystems is desirable for several reasons. For example, in the case of the fuel delivery subsystem, that ability is important for reducing the occurrence of primary failures which result in stoppage of cargo and passenger transportation. These failures can be very expensive in terms of lost revenue due to delayed cargo delivery, lost productivity of passengers, other trains delayed due to the failed one, and expensive on-site repair of the failed locomotive. Further, some of those primary failures could result in secondary failures that in turn damage other subsystems and/or components. It will be further appreciated that the ability to predict failures before they occur in the fuel delivery subsystem would allow for conducting condition-based maintenance, that is, maintenance conveniently scheduled at the most appropriate time based on statistically and probabilistically meaningful information, as opposed to maintenance performed regardless of the actual condition of the subsystems, such as would be the case if the maintenance is routinely performed independently of whether the subsystem actually needs the maintenance or not. Needless to say, a condition-based maintenance is believed to result in a more economically efficient operation and maintenance of the locomotive due to substantially large savings in cost. Further, such type of proactive and high-quality maintenance will create an immeasurable, but very real, good will generated due to increased customer satisfaction. For example, each customer is likely to experience improved transportation and maintenance operations that are even more efficiently and reliably conducted while keeping costs affordable since a condition-based maintenance of the locomotive will simultaneously result in lowering maintenance cost and improving locomotive reliability.
Previous attempts to overcome the above-mentioned issues have been generally limited to diagnostics after a problem has occurred, as opposed to prognostics, that is, predicting a failure prior to its occurrence. For example, previous attempts to diagnose problems occurring in a locomotive have been performed by experienced personnel who have in-depth individual training and experience in working with locomotives. Typically, these experienced individuals use available information that has been recorded in a log. Looking through the log, the experienced individuals use their accumulated experience and training in mapping incidents occurring in locomotive subsystems to problems that may be causing the incidents. If the incident-problem scenario is simple, then this approach works fairly well for diagnosing problems. However, if the incident-problem scenario is complex, then it is very difficult to diagnose and correct any failures associated with the incident and much less to prognosticate the problems before they occur.
Presently, some computer-based systems are being used to automatically diagnose problems in a locomotive in order to overcome some of the disadvantages associated with completely relying on experienced personnel. Once again, the emphasis on such computer-based systems is to diagnose problems upon their occurrence, as opposed to prognosticating the problems before they occur. Typically, such computer-based systems have utilized a mapping between the observed symptoms of the failures and the equipment problems using techniques such as a table look up, a symptom-problem matrix, and production rules. These techniques may work well for simplified systems having simple mappings between symptoms and problems. However, complex equipment and process diagnostics seldom have simple correspondences between the symptoms and the problems. Unfortunately, as suggested above, the usefulness of these techniques have been generally limited to diagnostics and thus even such computer-based systems have not been able to provide any effective solution to being able to predict failures before they occur.
In view of the above-mentioned considerations, there is a general need to be able to quickly and efficiently prognosticate any failures before such failures occur in the fuel delivery subsystem of the locomotive, while minimizing the need for human interaction and optimizing the repair and maintenance needs of the subsystem so as to able to take corrective action before any actual failure occurs.
BRIEF SUMMARY OF THE INVENTION
Generally speaking, the present invention fulfills the foregoing needs by providing a method for determining degradation of fuel pump performance in a locomotive having an internal combustion engine. The method allows for monitoring a signal indicative of a fuel value delivered by the fuel pump and for adjusting the value of the monitored signal for deviations from an estimated nominal fuel value due to predetermined external variables to generate an adjusted fuel value. The method further allows for comparing the value of the adjusted fuel value against the nominal fuel value to determine the performance of the pump.
The present invention further fulfills the foregoing needs by providing a system for determining degradation in fuel pump performance in a locomotive having an internal combustion engine. The system includes a signal monitor coupled to monitor a signal indicative of a fuel value delivered by the fuel pump. A first module is coupled to the signal monitor to adjust the monitored signal for deviations from an estimated nominal fuel value due to predetermined external variables to generate an adjusted fuel value. A second module is coupled to the first module to receive the adjusted fuel value. The second module is configured to compare the value of the adjusted fuel value against a nominal fuel value to determine the performance of the pump.
REFERENCES:
patent: 4270174 (1981-05-01), Karlin et al.
patent: 4463418 (1984-07-01), O'Quin, II et al.
patent: 4491112 (1985-01-01), Kanegae et al.
patent: 4509480 (1985-04-01), Kull et al.
patent: 4515125 (1985-05-01), Buck et al.
patent: 4517468 (1985-05-01), Kemper et al.
patent: 4695946 (1987-09-01), Andreasen et al.
patent: 4823914 (1989-04-01), McKinney et al.
patent: 4970725 (1990-11-01), McEnroe et al.
patent: 4977390 (1990-12-01), Saylor et al.
patent: 5113489 (1992-05-01), Cihiwsky et al.
patent: 5123017 (1992-06-01), Simpkins et al.
patent: 5274572 (1993-12-01), O'Neill et al.
patent: 5282127 (1994-01-01), Mii
patent: 5321837 (1994-06-01), Daniel et al.
patent: 5329465 (1994-07-01), Arcella et al.
patent: 5377112 (1994-12-01), Brown, Jr. et al.
patent: 5394851 (1995-03-01), Cryer et al.
patent: 5400018 (1995-03-01), Scholl et al.
patent: 5406502 (1995-04-01), Haramaty et al.
patent: 5445347 (1995-08-01), Ng
patent: 5508941 (1996-04-01), Leplingard et al.
patent: 5528516 (1996-06-01), Yemini et al.
patent: 5594663 (1997-01-01), Messaros et al.
patent: 5633628 (1997-05-01), Denny et al.
patent: 5638296 (1997-06-01), Johnson et al.
patent: 5661668 (1997-08-01), Yemini et al.
patent: 5666534 (1997-09-01), Gilbert et al.
patent: 5678002 (1997-10-01), Fawcett et al.
patent: 5732676 (1998-03-01), Weisman et al.
patent: 5742915 (1998-04-01), Stafford
patent: 5845272 (1998-12-01), Morjaria et al.
patent: 6076504 (2000-06-01), Stavnheim et al.
patent: 6109244 (2000-08-01), Yamamoto et al.
patent: 0 810 364 A3 (2000-07-01), None
Data-Tronic Gas Turbine Information And Control System; General Electric Gas Turbine Reference Library; 8 pgs.
Cryer Robert Douglas
Gallagher Shawn Michael
Patel Sagar Arvindbhai
Beusse Brownlee Bowdoin & Wolter PA
Castro Arnold
Dolinar Andrew M.
General Electric Company
Mora, Es Enrique J.
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