Source: https://patents.google.com/patent/US9606022B2/en
Timestamp: 2018-10-18 00:08:21
Document Index: 206778930

Matched Legal Cases: ['Application No. 2012308951', 'Application No. 2012308952', 'Application No. 2012308955', 'Application No. 201280044835', 'Application No. 201280044849', 'Application No. 201280044851', 'Application No. 201280044851', 'Application No. 2014530692', 'Application No. 2014530693']

US9606022B2 - Systems and methods for diagnosing engine components and auxiliary equipment associated with an engine - Google Patents
Systems and methods for diagnosing engine components and auxiliary equipment associated with an engine Download PDF
US9606022B2
US9606022B2 US14211313 US201414211313A US9606022B2 US 9606022 B2 US9606022 B2 US 9606022B2 US 14211313 US14211313 US 14211313 US 201414211313 A US201414211313 A US 201414211313A US 9606022 B2 US9606022 B2 US 9606022B2
US14211313
US20150355054A1 (en )
Diagnosing equipment coupled to a generator. A condition of the equipment is diagnosed based on information provided by signals from a generator operationally connected to the equipment or other signals associated with an engine. Different types of degradation are distinguished based on discerning characteristics within the information. Thus, a degraded equipment component can be identified in a manner that reduces service induced delay.
This U.S. Patent Application is a continuation-in-part (CIP) patent application of: Application No. PCT/US12/53473 filed on Aug. 31, 2012; and of Application No. PCT/US12/53499 filed on Aug. 31, 2012; and of Application No. PCT/US12/53495 filed on Aug. 31, 2012.
The following U.S. Patents are incorporated herein by reference in their entirety: U.S. Pat. No. 8,538,626 issued on Sep. 17, 2013; U.S. Pat. No. 8,626,371 issued on Jan. 7, 2014; and U.S. Pat. No. 8,626,372 issued on Jan. 7, 2014.
In one embodiment, a system is disclosed. The system includes a controller that is operable to determine a condition of equipment electrically coupled to a generator based on frequency content of a measured dc-link parameter associated with the generator over time.
In one embodiment, a system is disclosed. The system includes a controller that is operable to determine a condition of equipment operatively coupled to a rotating shaft of a reciprocating engine based at least in part on a frequency content of a measured rotational speed of the shaft over time.
In one embodiment, a method is disclosed. The method includes measuring a dc-link parameter associated with a generator that is coupled to an engine during operation using a dc-link sensor, and diagnosing a condition of an engine component of the engine based on frequency content of the dc-link parameter using at least a processor.
FIG. 6 is an illustration of an example embodiment of how to isolate a degradation to a particular auxiliary system;
FIG. 7 is an illustration of an example embodiment of how to diagnose a condition of auxiliary equipment using a bank of tuned bandpass filters;
FIG. 8 is an illustration of an example embodiment of the vehicle system of FIG. 1, and further including an analytic system; and
FIG. 9 is an illustration of an example embodiment of the vehicle system of FIG. 1 communicating with an external analytic system.
Embodiments of the subject matter disclosed herein relate to systems and a methods for diagnosing engine components of an engine and auxiliary equipment associated with an engine. Test kits for performing the methods are provided, also. The engine may be included in a vehicle, such as a locomotive system. Other suitable types of vehicles may include on-highway vehicles, off-highway vehicles, mining equipment, aircraft, and marine vessels. Other embodiments of the invention may be used for stationary engines such as wind turbines or power generators. The engine may be a diesel engine, or may combust another fuel or combination of fuels. Such alternative fuels may include gasoline, kerosene, biodiesel, natural gas, and ethanol—as well as combinations of the foregoing. Suitable engines may use compression ignition and/or spark ignition. These vehicles may include an engine with components that degrade with use.
Furthermore, embodiments of the subject matter disclosed herein use generator data, such as measured generator electrical parameters or generator data (e.g., a derived torque profile) derived from measured generator electrical parameters and/or engine parameters (e.g., speed), to diagnose conditions of engine components of an engine or auxiliary equipment and to distinguish between conditions and associated engine components and auxiliary equipment.
FIG. 1 is an illustration of an example embodiment of a vehicle system 100 (e.g., a locomotive system) herein depicted as a rail vehicle 106 configured to run on a rail 102 via a plurality of wheels 108. As depicted, the rail vehicle 106 includes an engine 110 operatively connected to a generator (alternator) 120. The vehicle 106 also includes traction motors 130 operatively connected to the generator 120 for driving the wheels 108. The vehicle 106 further includes various auxiliary systems or equipment 140 operatively connected to the generator 120 or the engine 110 (e.g., the rotatable engine shaft 111, sec FIG. 2) for performing various functions. Even though labeled separately in FIG. 1, the traction motors 130 are considered to be a type of auxiliary equipment herein.
In accordance with an embodiment, the dc-link voltage is measured by the dc-link sensor 171 and is analyzed by the controller 150 to diagnose a condition of the engine or auxiliary equipment based on frequency content of the dc-link voltage. A Fourier transform process 310 or a bandpass filtering process 320 can be used to determine the frequency content of the dc-link voltage as shown in FIG. 3. For auxiliary systems that operate intermittently, time-frequency analysis techniques such as short time Fourier transformation or wavelet transformation may be used. As an alternative, the dc-link current can be measured and used instead of the dc-link voltage. The controller 150 is configured to analyze one or more components of the frequency content, isolate to a particular engine component or auxiliary system, and diagnose the condition of the particular engine component or auxiliary system (e.g., down to a particular component of the auxiliary system). In accordance with an embodiment, the engine 110 may first be driven to a specified operating condition, state, or mode before diagnosing the engine or auxiliary equipment.
The controller 150 samples the dc-link parameter over time and performs a frequency analysis process on the dc-link parameter data. In accordance with one embodiment, the frequency analysis process is a Fourier transform process 310 (e.g., a Fast Fourier Transform, FFT, process). In accordance with another embodiment, the frequency analysis process is a bandpass filtering process 320. The frequency analysis process transforms the sampled time domain dc-link parameter into frequency content in the frequency domain. The various frequency components of the frequency content can include dc (zero order), fundamental (first order) and harmonic (second order, half order, third order, etc.) frequency components. The fundamental frequencies for each of the connected auxiliary systems could be different, depending on the speed/mode of operation of the engine or auxiliary systems. In accordance with an embodiment, the Fourier Transform process and the bandpass filtering process include computer executable instructions that are executed by the processor 152. The frequency transformation can be performed on processed/derived signals such as, for example, kilovolt-amps (kVA) or kilowatts (kW) which are the product of current and voltage, or torque which is kW/frequency of the signal.
FIG. 5 is an illustration of an embodiment of how a diagnostic logic 510 in the controller 150 can detect an unhealthy condition in the frequency content of a dc-link parameter. For example, the half order component 421 can be compared to a threshold level T by the diagnostic logic 510. If the magnitude of the component 421 exceeds the threshold level T, then the diagnostic logic 510 determines that degradation in an auxiliary system has occurred. Furthermore, if the diagnostic logic 510 determines that the ratio of the half order component to the first order component 422 exceeds a second threshold level, and the ratio of the first order component to the second order component 423 exceeds a third threshold level, then the diagnostic logic 510 isolates the degradation to a particular auxiliary system component. In accordance with an embodiment, the diagnostic logic includes computer executable instructions that are executed by the processor 152. In accordance with an embodiment, the ratio of a half order component to a dc or zero order component can be indicative of an engine or auxiliary equipment problem. Furthermore, the threshold level T can be dependent on an operating condition of the engine or auxiliary equipment such as, for example, power, speed, ambient conditions, repair history, etc.
In accordance with an embodiment, a plurality of frequency components of the frequency content of the dc-link voltage (or dc-link current) are tracked continuously and correlated to particular engine components or auxiliary equipment. If a particular frequency component does not correlate to a particular engine component or auxiliary system, then a condition, state, or operating condition of the engine 110 (e.g., speed) can be varied to determine if the particular frequency component correlates to the engine. In this manner, distinctions can be made between engine degradation and auxiliary equipment degradation. In accordance with an embodiment, the various auxiliary systems provide feedback to the controller 150 (via sensor indicators) such that the controller is aware of which condition of which auxiliary system is varying.
Referring again to FIG. 2, various mechanically driven auxiliary equipment 144 can be operatively coupled to the rotating shaft 111 of the engine 110. Examples of such mechanically driven equipment may include pumps and engine cooling systems. In accordance with an embodiment, the rotating shaft speed of the engine 110 is measured (e.g., via the speed sensor 160) and the controller 150 diagnoses a condition of the engine or auxiliary equipment based on frequency content of the shaft speed.
Again, a Fourier transform process 310 or a bandpass filtering process 320 can be used to determine the frequency content of the shaft speed. For auxiliary systems that operate intermittently, time-frequency analysis techniques such as short time Fourier transform or wavelet transform may be used. The controller 150 is configured to analyze one or more components of the frequency content, isolate to a particular engine component or auxiliary system coupled to the rotating shaft 111, and diagnose the condition of the particular engine component or auxiliary system. In accordance with an embodiment, the engine 110, or any of the auxiliary equipment, may first be driven to a specified operating condition, state, or mode before diagnosing the auxiliary equipment. For example, if a frequency generated by the engine is the same as or very close to a frequency produced by the auxiliary equipment during the diagnosis, then the mode/frequency of operation of the engine, auxiliary equipment, or both can be changed to provide a frequency separation. This separation can be performed during the time of diagnosis.
Again, FIG. 6 is an illustration of an example embodiment of how to isolate a degradation to a particular engine component or auxiliary system. A particular frequency component of the frequency content out of the FFT process or the bandpass filtering process is tracked (in frequency) by a phase-locked loop (PLL) process 610 of the controller 150. In accordance with an embodiment, the operating condition, state, or mode (e.g., pressure) of a particular engine component or auxiliary system (e.g., a pump) can be varied by the controller 150. If the particular frequency component varies (as tracked by the PLL process) in correspondence with the varying operating condition, state, or mode of the particular engine component or auxiliary system, then that particular frequency component is correlated to that particular engine component or auxiliary system. The amplitude and/or phase of the tracked frequency component can be compared to one or more thresholds to diagnose the particular problem with the isolated engine component or auxiliary system.
In accordance with an embodiment, a plurality of frequency components of the frequency content of the shaft speed are continuously tracked and correlated to particular engine components or auxiliary equipment coupled to the shaft 111. In accordance with an embodiment, the engine and various auxiliary systems provide feedback to the controller 150 such that the controller is aware of which condition of which auxiliary system is varying. As a result, if a particular frequency component suddenly appears in the frequency content of the speed signal, the techniques described herein can be employed to isolate the frequency component to the engine component or auxiliary equipment and, ultimately, to a particular problem with a particular engine component or auxiliary system.
In accordance with an embodiment, the controller 150 is operable to report a degraded engine component or auxiliary equipment condition, for example, via the display 180 and the communication system 190. Furthermore, in accordance with an embodiment, the controller 150 includes instructions configured to adjust an engine or auxiliary equipment operating parameter (e.g., fan speed) based on the diagnosed condition.
An embodiment includes a test kit having a controller that is operable to determine a condition of an engine component or auxiliary equipment electrically coupled to a generator based on frequency content of a measured dc-link parameter associated with the generator over time. The test kit may further include a sensor to sense the dc-link parameter (e.g., voltage or current) associated with the generator. The controller is further operable to communicate with the sensor to sample the dc-link parameter over time and to extract the frequency content of the dc-link parameter.
Another embodiment includes a test kit having a controller that is operable to determine a condition of an engine component or auxiliary equipment operatively coupled to a rotating shaft of a reciprocating engine based on frequency content of a measured speed of the shaft over time. The test kit may further include a sensor to sense the speed of the shaft. The controller is further operable to communicate with the speed sensor to sample the speed over time and to extract frequency content of the speed.
As an alternative, instead of employing a PLL process, the dc-link voltage (or dc-link current) or the speed signal can be processed by a bank of bandpass filters in the controller 150, each tuned to a particular frequency corresponding to operation under particular conditions. Root-mean-square (RMS) values of the filtered signals (or some other combination, e.g., average, of the filtered signals) provide an indication of the health of the engine or auxiliary components (e.g., by comparing the RMS values to determined threshold values). FIG. 7 is an illustration of an example embodiment of how to diagnose a condition of an engine component or auxiliary equipment using a bank of tuned bandpass filters 710 along with a RMS process 720 and a comparator process 730 provided by the controller (e.g., in the form of computer executable instructions, for example).
Again, instead of employing a PLL process, the dc-link voltage or the speed signal can be processed by the FFT process or the bandpass filtering process and patterns in the frequency content can be analyzed by the controller to determine failure modes or degradation of the engine or auxiliary equipment. Various harmonics in the frequency content can be correlated to particular engine components or auxiliary equipment by knowing in advance the fundamental frequency of operation of the particular systems. For example, a 12 Hz sub-harmonic frequency may be correlated to an auxiliary system operating at a fundamental frequency of 24 Hz.
Both the frequency content of the speed signal and the frequency content of the dc-link voltage (or dc-link current) can be used to diagnose a condition of the engine or auxiliary equipment. The various techniques described herein may be combined in particular ways, using both speed and dc-link signals, to distinguish from the engine, isolate to a particular auxiliary system, and further isolate to a particular component of the auxiliary system.
Further examples of applications of systems and methods described herein are now provided. The examples illustrate various approaches for diagnosing and distinguishing between different types of engine or auxiliary system degradation based on the frequency content of dc-link data and/or engine speed data.
In one embodiment, a degraded engine component or auxiliary system may be detected based on a frequency content signature, such as the magnitude of the half-order frequency component being greater than a half-order threshold value. In an alternate embodiment, the magnitudes of the frequency content may be integrated over the range of frequencies, and a degraded component of an engine component or an auxiliary system may be detected based on the integration being greater than an integral threshold value.
Detection of one degraded component, where the other components of the engine or auxiliary system are more healthy (or less degraded), may have a more clear frequency content signature than when multiple components of the engine or auxiliary system are degraded. For example, the frequency content signature of one degraded component may be identified by comparing the magnitude of the half-order frequency component to a half-order magnitude threshold value. However, multiple degraded components may have a different frequency component signature than a single degraded component. Further, the position in the operating sequence order of multiple degraded components may change the frequency content signature. For example, two degraded components 180° out of phase may have a different frequency component signature than two degraded components in successive operating sequence order, and thus the methods disclosed herein may identify one or more degraded components based on various changes in the frequency content signature. Further, it may be beneficial to generate a frequency content signature of a healthy engine component or auxiliary system by recording frequency content at various frequencies and operating conditions. In one embodiment, the frequency content of an engine component or an auxiliary system may be compared to the frequency content signature of a healthy engine component or auxiliary system. Anomalies not matching the frequency content signature of the healthy engine component or auxiliary system or a different degraded engine component or auxiliary system component may be identified and reported by the controller, for example.
In one embodiment, the time-domain dc-link data may be filtered by a low-pass filter with a cut-off frequency slightly greater than the first-order frequency. For example, the cut-off frequency may be ten to twenty percent greater than the first order frequency. Thus, in one embodiment, the cutoff frequency may be determined by the engine speed. The dc-link data may be sampled in time at a frequency greater than or equal to the Nyquist rate. In one embodiment, the time-domain signal may be sampled at a frequency greater than twice the first engine order frequency (or first auxiliary system order frequency). In one embodiment, the time-domain signal may be sampled at a frequency greater than twice the engine red-line frequency. Thus, by low-pass filtering and sampling at a frequency greater than or equal to the Nyquist rate, the frequency content of the dc-link data may not be aliased. The same may apply for speed data of the engine.
As discussed herein, the sampled dc-link data (e.g., dc-link voltage, dc-link current) and/or engine speed data may be transformed to generate a frequency domain frequency content. In one embodiment, a fast Fourier transform may be used to generate the frequency domain frequency content. In one embodiment, a correlation algorithm may be applied to compare the frequency content of the dc-link data and/or engine speed data, to a signature for a condition of an engine component or an auxiliary system. For example, the signature for a healthy auxiliary system may include frequency content at the first-order frequency with a magnitude below a first-order threshold value and frequency content at the half-order frequency with a magnitude below a half-order threshold value. The first-order threshold value may correspond to an operational state of the auxiliary system.
For example, the historical engine or auxiliary system data may be stored in a database including samples of frequency content from earlier operation of the engine or auxiliary system. Thus, a trend in frequency content may be detected and the trend may be used to determine the health of the engine or auxiliary system. For example, an increasing magnitude at the half order component for a given radiator fan speed and load may indicate that a radiator fan is degrading.
In one embodiment, frequency content of the dc-link data and/or engine speed data may be stored in a database including historical auxiliary equipment data. For example, the database may be stored in memory 154 of controller 150. As another example, the database may be stored at a site remote from rail vehicle 106. For example, historical data may be encapsulated in a message and transmitted with communications system 190. In this manner, a command center may monitor the health of the engine or auxiliary equipment in real-time. For example, the command center may perform steps to diagnose the condition of the engine or auxiliary equipment using the dc-link data and/or engine speed data transmitted with communications system 190. For example, the command center may receive dc-link voltage data from rail vehicle 106, frequency transform the dc-link voltage data, apply a correlation algorithm to the transformed data, and diagnose potential degradation of an engine component or an auxiliary system. Further, the command center may schedule maintenance and deploy healthy locomotives and maintenance crews in a manner to optimize capital investment. Historical data may be further used to evaluate the health of the engine or auxiliary equipment before and after equipment service, equipment modifications, and equipment component change-outs.
In one embodiment, a potential fault may be reported to the locomotive operating crew via display 180. Once notified, the operator may adjust operation of rail vehicle 106 to reduce the potential of further degradation of the engine or auxiliary equipment. In one embodiment, a message indicating a potential fault may be transmitted with communications system 190 to a command center. Further, the severity of the potential fault may be reported. For example, diagnosing a fault based on frequency content of dc-link data and/or engine speed data may allow a fault to be detected earlier than when the fault is diagnosed with only average engine or auxiliary system information. Thus, the engine or auxiliary system may continue to operate when a potential fault is diagnosed in the early stages of degradation. In contrast, it may be desirable to stop the engine component or auxiliary system or schedule prompt maintenance if a potential fault is diagnosed as severe. In one embodiment, the severity of a potential fault may be determined according to a difference between a threshold value and the magnitude of one or more components of the frequency content of the dc-link and/or speed data.
By analyzing the frequency content of dc-link data and/or engine speed data, it may be possible to monitor and diagnose the engine or auxiliary equipment during operation. Further, operation of an engine or auxiliary system with a degraded component may be adjusted to potentially reduce additional degradation of the component and to potentially reduce the likelihood of additional engine or auxiliary system failure and in-use failure. For example, the half-order component may be compared to a half-order threshold value. In one embodiment, if the magnitude of the half-order component is greater than the half-order threshold value, the potential fault may be a degraded a first degraded component. However, if the magnitude of the half-order component is not greater than the half-order threshold value, the potential fault may be a second degraded component.
In one example, the half-order frequency component of the dc-link and/or speed data may be monitored for each disabled component of an engine or auxiliary system. The component may be degraded when the half-order frequency component drops below a half-order threshold value while the component is disabled. The component may be a healthy component when the half-order frequency component remains above the half-order threshold value while the component is disabled. In other words, the degraded component may be the component that contributes a higher amount of frequency content at the half-order frequency component than other engine or auxiliary system components. In one embodiment, the selective disabling diagnosis may be performed when the engine or auxiliary system is operating at idle or lightly loaded.
It may be more desirable to switch off an engine component or auxiliary system than to have a degraded component fail in a manner that may cause additional damage to the engine or auxiliary system. In one embodiment, a threshold value may be determined that indicates continued operation of the engine or auxiliary system may be undesirable because the potential fault is severe. For example, the potential fault may be judged as severe if a magnitude of the half-order frequency component exceeds a threshold value. The engine or auxiliary system may be stopped if the severity of the potential fault exceeds the threshold value.
A request to schedule service may be sent, such as by a message sent via communications system 190, for example. Further, by sending the potential fault condition and the severity of the potential fault, down-time of rail vehicle 106 may be reduced. For example, service may be deferred on rail vehicle 106 when the potential fault is of low severity. Down-time may be further reduced by derating power of the engine or auxiliary system, such as by adjusting an engine or auxiliary system operating parameter based on the diagnosed condition. It may be determined if derating of the engine or auxiliary system is enabled. For example, derating the power of the engine or auxiliary system may reduce the magnitude of one or more components of the frequency content of the dc-link data.
In one embodiment, a test kit may be used for identifying frequency content of the dc-link data and/or engine speed data and diagnosing a condition of the engine or auxiliary equipment based on the frequency content of the data. For example, a test kit may include a controller that is operable to communicate with one or more dc-link sensors and/or engine speed sensors and operable to sample the associated data. The controller may be further operable to transform signals from the one or more sensors into a frequency content that represents frequency information of the engine or auxiliary equipment. The controller may be further operable to diagnose a condition of the engine or auxiliary equipment based on the frequency content of the generator data from the sensors. The test kit may further include one or more sensors for sensing dc-link parameters (e.g., dc-link voltage) and/or engine parameters (e.g., engine speed).
Vehicle system components that have a periodic nature to them, or which make periodic noise upon degradation or failure, may be able to be diagnosed by observing a dc-link parameter associated with a generator of the vehicle system.
In one embodiment, a system is provided having a controller that is operable to determine a condition of equipment electrically coupled to a generator based on frequency content of a measured dc-link parameter associated with the generator over time. The system also has a sensor to sense the dc-link parameter associated with the generator. The sensor is operable to communicate with the controller and to sample the dc-link parameter over time. The controller is further operable to extract the frequency content of the dc-link parameter.
In one embodiment, a system is provided having a controller that is operable to determine a condition of equipment operatively coupled to a rotating shaft of a reciprocating engine based at least in part on a frequency content of a measured rotational speed of the shaft over time. The system may also have a sensor to sense the rotational speed of the shaft and to sample the speed over time, and to communicate speed sample information to the controller. The controller may be further operable to extract the frequency content of the speed. The equipment may be an engine component that includes one or more of a cylinder, an injector, a pump, a valve, a piston, a compressor, or a blade. The controller may be further operable to diagnose the condition of the engine component based on a magnitude of a peak of the frequency content. The controller may be further operable to notify one or more of an operator of the engine, a dispatcher, or a service shop of a diagnosed condition of the engine.
In one embodiment, a method is provided. The method includes measuring a dc-link parameter associated with a generator that is coupled to an engine during operation using a dc-link sensor, and diagnosing a condition of an engine component of the engine based on frequency content of the dc-link parameter using at least a processor. The method may also include diagnosing the condition of the engine component based on a magnitude of a peak of the frequency content. The method may further include diagnosing the condition of the engine component based on one or more of a magnitude or a phase of the frequency content. The method may also include diagnosing the condition of the engine component based on a half-order component of the frequency content.
The method may include generating a historical file of diagnostic data and monitoring the historical file for changes in the diagnostic data over time and determining trends. For example, the method may include generating a historical file of diagnostic data, monitoring the historical file for diagnostic data that changes a determined amount over a period of time preceding a fault, and setting a failure threshold level in response to the monitoring. The method may also include predicting a failure of the engine component.
As an example, referring to FIG. 8, an analytic system 810, having a historical database 820, may capture data to generate a historical database 820 of diagnostic data that may be analyzed by the analytic system 810. The analytic system 810 may be onboard the locomotive of a train and be a part of the vehicle system 100. The analytic system 810 may be configured to communicate with the controller 150 (e.g., via wired means). Alternatively, the analytic system 810 may be an integral part of the controller 150.
As a further alternative, referring to FIG. 9, the analytic system 810, having the historical database 820, may be at a remote location and may be configured to communicate with the vehicle system 100 of a train via the communication system 190 and an external communication network 910, for example. The external communication network 910 may include a cellular telephone network, a satellite communication network, some other wireless communication network, the internet, or some combination thereof, for example.
The database may be reviewed to determine incipient signal levels preceding a fault or failure of an engine component. The results of the review may be used to set a threshold level. Signal strength may be observed in the database and rate of change of signal strength over time may be determined from the database. For example, a 20% rise in a particular frequency component over a one-week span may be determined to occur, from the database information, before a particular engine component fails. As another example, it may be determined from the database information that, once a peak level of a particular frequency component doubles from where it started, a particular engine component is going to fail. Therefore, a calculated rate of change until 200% of original peak signal level may be used to determine a time to failure of the engine component.
The method may include determining a severity of a degraded condition of the engine component, for example, by determining which engine component is affected and to what extent it is compromised. The method may also include notifying one or more of an operator of the engine, a dispatcher, or a service shop of a diagnosed condition of the engine. The method may further include scheduling maintenance of the engine in response to diagnosing a condition of an engine component.
The method may include confirming a diagnosed condition of the engine component by cross-referencing the diagnosed condition with information stored in a diagnostic data archive. The diagnostic data archive may be similar to the historical database 820 but may also include additional information such as, for example, information derived from captured diagnostic data through analysis and information from maintenance records. For example, as a turbocharger component of an engine fails, it often has a vibration associated with it, and the turbocharger component may fail to send compressed air effectively to the engine cylinders resulting in an overall power loss. Also, exhaust gas may become constricted and the exhaust manifold temperature may increase as a result.
In observing a particular fault, cross-reference against other sensor data associated with that fault may be performed to determine if the diagnosed condition is likely to be correct. For example, it might be suspicious if a turbocharger component, having high vibration with no loss of power and no rise in temperature, is observed. By cross-referencing with information stored in a diagnostic data archive, another cause of turbocharger component vibration may be found that may be worth considering (e.g., failing bearings) rather than assuming that a diagnoses of a filing turbocharger component is true.
As a further example, wear of an engine component may be observed in a real-world situation, even though the diagnostic data archive shows that the engine component has been recently replaced. Such an indication may show that more detailed investigation is warranted before reaching a diagnostic conclusion.
The method may include confirming a diagnosed condition of an engine component by initiating, in a safe operating mode, at least one test that changes at least one operating parameter of the engine to intentionally change the diagnosed condition. For example, the firing of certain cylinders of an engine may be skipped, or changing the speed of the engine may be accomplished, and the resultant effect on the measured data may be observed. As another example, fuel injection to a particular engine cylinder may be increased and fuel injection to the other engine cylinders may be decreased as part of testing. The method may include taking at least one proactive step to avoid a catastrophic failure of the engine component such as, for example, de-rating the engine component in response to diagnosing a condition of the engine component or disabling the engine component in response to diagnosing a condition of the engine component. For example, an affected cylinder of an engine may be shut down.
a controller that is operable to determine a condition of equipment electrically coupled to a generator based on frequency content of a measured dc-link parameter associated with the generator over time; and
a sensor configured to sense the dc-link parameter associated with the generator.
2. The system of claim 1, wherein the sensor is operable to communicate with the controller and to sample the dc-link parameter over time, and wherein the controller is further operable to extract the frequency content of the dc-link parameter.
measuring a dc-link parameter associated with a generator that is coupled to an engine during operation using a dc-link sensor; and
diagnosing a condition of an engine component of the engine based on frequency content of the dc-link parameter using at least a processor.
4. The method of claim 3, further comprising diagnosing the condition of the engine component based on a magnitude of a peak of the frequency content.
5. The method of claim 3, further comprising diagnosing the condition of the engine component based on one or more of a magnitude or a phase of the frequency content.
6. The method of claim 3, further comprising diagnosing the condition of the engine component based on a half-order component of the frequency content.
7. The method of claim 3, further comprising generating a historical file of diagnostic data and monitoring the historical file for changes in the diagnostic data over time.
8. The method of claim 3, further comprising generating a historical file of diagnostic data, monitoring the historical file for diagnostic data that changes a determined amount over a period of time preceding a fault, and setting a failure threshold level in response to the monitoring.
9. The method of claim 3, further comprising predicting a failure of the engine component.
10. The method of claim 3, further comprising determining a severity of a degraded condition of the engine component.
11. The method of claim 3, further comprising notifying one or more of an operator of the engine, a dispatcher, or a service shop of a diagnosed condition of the engine.
12. The method of claim 3, further comprising scheduling maintenance of the engine in response to diagnosing a condition of an engine component.
13. The method of claim 3, further comprising confirming a diagnosed condition of the engine component by cross-referencing the diagnosed condition with information stored in a diagnostic data archive.
14. The method of claim 3, further comprising confirming a diagnosed condition of the engine component by initiating, in a safe operating mode, at least one test that changes at least one operating parameter of the engine to intentionally change the diagnosed condition.
15. The method of claim 3, further comprising taking at least one proactive step to avoid a catastrophic failure of the engine component.
16. The method of claim 3, further comprising de-rating the engine component in response to diagnosing a condition of the engine component.
17. The method of claim 3, further comprising disabling the engine component in response to diagnosing a condition of the engine component.
US14211313 2011-09-15 2014-03-14 Systems and methods for diagnosing engine components and auxiliary equipment associated with an engine Active 2033-08-21 US9606022B2 (en)
PCT/US2012/053499 WO2013039726A1 (en) 2011-09-15 2012-08-31 Systems and methods for diagnosing an engine
PCT/US2012/053495 WO2013039725A1 (en) 2011-09-15 2012-08-31 Systems and methods for diagnosing an engine
PCT/US2012/053473 WO2013039723A1 (en) 2011-09-15 2012-08-31 Systems and methods for diagnosing auxiliary equipment associated with an engine
US14211313 US9606022B2 (en) 2012-08-31 2014-03-14 Systems and methods for diagnosing engine components and auxiliary equipment associated with an engine
PCT/US2012/053473 Continuation-In-Part WO2013039723A1 (en) 2011-09-15 2012-08-31 Systems and methods for diagnosing auxiliary equipment associated with an engine
US20150355054A1 true US20150355054A1 (en) 2015-12-10
US9606022B2 true US9606022B2 (en) 2017-03-28
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US14211313 Active 2033-08-21 US9606022B2 (en) 2011-09-15 2014-03-14 Systems and methods for diagnosing engine components and auxiliary equipment associated with an engine
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