Method for assessing the health status of an electrically controlled valve

Abstract

A method for assessing health of an electrically controlled valve includes measuring an input current input into an electrically controlled valve to change a position of the valve. An output current output from the valve in response to the input current input into the electrically controlled valve is measured. A position signal indicative of the position of the valve is generated using a sensor coupled with the electrically controlled valve. Baseline values associated with the input current, the output current, and the position signal are calculated. A health of the valve is determined by comparing the baseline values associated with the input current, the output current, and the position signal to subsequent measured values associated with the input current, the output current, and the position signal.

Description

Technical Field

[0001] This article describes a method and system for assessing the health status of electrically controlled valves. Background Technology

[0002] Stationary and non-stationary mechanical systems that use diesel or gasoline as fuel sources produce exhaust gases that are released into the atmosphere. These systems may contain valves and piping that can be controlled to regulate the amount of emissions released from the system. For example, an exhaust gas recirculation (EGR) valve may be an electronically controlled valve used within the system to recirculate a portion of the exhaust gases produced by the system's engine. Over time, these recirculation valves may occasionally require maintenance, repair, or replacement. However, determining the level of health of a valve or a specific component within it that requires maintenance or repair can be difficult to properly differentiate. For example, multiple different failure modes of an EGR valve may cluster together and be classified as generally unhealthy, rather than accurately identifying higher-level failure modes, leading to additional troubleshooting and unnecessary part replacements. Summary of the Invention

[0003] In one or more embodiments, a method includes measuring an input current input to an electrically controlled valve to change the position of the valve. Measuring an output current output from the electrically controlled valve in response to the input current input to the valve. Using a sensor coupled to the electrically controlled valve, a position signal indicating the position of the valve is generated. A baseline value associated with the input current, the output current, and the position signal is calculated. The health status of the electrically controlled valve is determined by comparing the baseline value associated with the input current, the output current, and the position signal with subsequent measurements associated with the input current, the output current, and the position signal.

[0004] In one or more embodiments, a system includes: an electrically controlled valve that receives an input current to change its position; and one or more sensors configured to measure the input current input to the electrically controlled valve and to measure an output current output from the electrically controlled valve in response to the input current input to the electrically controlled valve. The sensors generate a position signal indicating the position of the electrically controlled valve. The system includes one or more processors that calculate a baseline value associated with the input current, the output current, and the position signal. The processors determine the health status of the electrically controlled valve by comparing the baseline value associated with the input current, the output current, and the position signal with subsequent measurements associated with the input current, the output current, and the position signal.

[0005] In one or more embodiments, a method includes measuring an input current input to an electrically controlled valve to change the position of the valve. The method includes measuring an output current output from the electrically controlled valve in response to the input current input to the valve. A position voltage is measured using a sensor coupled to the electrically controlled valve. The position voltage indicates the position of the electrically controlled valve. A baseline value associated with the input current, the output current, and the position voltage is calculated based on previous measurements of the input current, the output current, and the position voltage. The calculated baseline value includes: a first average and a first standard deviation of the sum of the position voltages repeatedly sampled during a previous shift time window; a second average and a second standard deviation of a first difference between the position voltages repeatedly sampled during the previous shift time window; and a third average and a third standard deviation of a second difference between the input current and the output current repeatedly sampled during the previous shift time window. Calculate a fourth average and a fourth standard deviation of the sum of the position voltages repeatedly sampled during a subset of the previous moving time window; calculate a fifth average and a fifth standard deviation of the first difference between the position voltages repeatedly sampled during the subset of the previous moving time window; and calculate a sixth average and a sixth standard deviation of the second difference between the input current and the output current repeatedly sampled during the subset of the previous moving time window. Compare the fourth average and the fourth standard deviation with the first average and the first standard deviation; compare the fifth average and the fifth standard deviation with the second average and the second standard deviation; and compare the sixth average and the sixth standard deviation with the third average and the third standard deviation. Determine the health status of the electronically controlled valve by determining a set of comparison values, which indicate comparing the fourth average and the fourth standard deviation with the first average and the first standard deviation, comparing the fifth average and the fifth standard deviation with the second average and the second standard deviation, and comparing the sixth average and the sixth standard deviation with the third average and the third standard deviation. The health status of the electronically controlled valve is determined by mapping the set of comparison values ​​to the different values ​​of the health status of the electronically controlled valve. Attached Figure Description

[0006] Referring to the accompanying drawings, the subject matter of the invention can be understood by reading the following description of non-limiting embodiments, in which:

[0007] Figure 1 An electrically controlled valve according to one embodiment is shown;

[0008] Figure 2 Showing Figure 1 A partial cross-sectional view of the electrically controlled valve shown;

[0009] Figure 3 A side view of an electrically controlled valve according to one embodiment is shown;

[0010] Figure 4 Showing Figure 3 The front view of the electrically controlled valve shown;

[0011] Figure 5 Showing Figure 3 A cross-sectional side view of a portion of the electrically controlled valve shown;

[0012] Figure 6 Showing Figure 3 A top view of a cross-section of a portion of the electrically controlled valve shown;

[0013] Figure 7 A flowchart illustrating an example of a method for determining the health status of an electronically controlled valve according to one embodiment is provided.

[0014] Figure 8 An example of a value associated with an electronically controlled valve according to one embodiment is shown;

[0015] Figure 9 An example of a baseline value associated with an electronically controlled valve according to one embodiment is shown;

[0016] Figure 10 A timeline including moving time windows is shown according to one embodiment; and

[0017] Figure 11 A table showing an example of determining the health status of an electronically controlled valve based on mapping comparison values ​​from one embodiment is presented. Detailed Implementation

[0018] The embodiments of the subject matter described herein relate to evaluation systems and methods associated with such systems. Evaluation systems can be used to determine the health status of electronically controlled valves, such as exhaust gas recirculation (EGR) valves used in systems discharging exhaust gases or other fluids. For example, an EGR valve can be controlled to recirculate a portion of the exhaust gases produced by the engine back into the engine cylinders, and the evaluation systems and methods described herein can determine the health status of the EGR valve.

[0019] The health status of an electrically controlled valve can be determined by measuring various data associated with the valve. For example, the dataset may include the input current applied to a pumping unit that pumps fluid into the valve chamber, the output current output in response to the input current, and a position signal indicating the position of the electrically controlled valve using a position sensor. For instance, the position signal may be or include a position voltage. Baseline values ​​associated with the input current, output current, and position signal based on previous measurements can be calculated, and the valve's health status can be determined by comparing the baseline values ​​associated with the input current, output current, and position voltage with the most recent (e.g., subsequent) values ​​associated with the input current, output current, and position signal.

[0020] In one or more embodiments, the calculated baseline value may comprise the sum of position signals (e.g., position voltages). Optionally, the baseline value may comprise the difference between position signals. Optionally, the baseline value may comprise the difference between input current and output current. In one or more embodiments, the baseline value may comprise the average and standard deviation of the sum of position signals repeatedly sampled during a previous movement time window; may comprise the average and standard deviation of the difference between position signals repeatedly sampled during a previous movement time window; and may comprise the average and standard deviation of the difference between input current and output current. Optionally, the baseline value may be determined or calculated using alternative evaluation methods. For example, the baseline value may be based on the average of the dataset, a percentage of the dataset, whether the dataset is within or outside a predetermined acceptable range, etc.

[0021] Figure 1 An electronically controlled valve 100 according to one embodiment is shown. In one or more embodiments, the electronically controlled valve may be an exhaust gas recirculation (EGR) valve used in a system discharging gases or other fluids. For example, the EGR valve may be used in fuel-powered vehicles (e.g., rail vehicles, automobiles, trucks, buses, mining vehicles, ships, manned and / or unmanned aircraft, agricultural vehicles, or other off-highway vehicles) or alternative fuel-powered systems (e.g., manufacturing machinery, power generation systems, household appliances, etc.). In one or more embodiments, the EGR system may use liquid fuels such as diesel or gasoline. The EGR valve may be used to control the amount of emissions generated by vehicle and / or non-vehicle systems. For example, the EGR valve may be controlled to recirculate a portion of the exhaust gas generated by the engine back into the engine cylinders.

[0022] The electrically controlled valve includes an electrical component 102 and a mechanical component 104 operatively coupled to the electrical component. The mechanical component includes a plate 106 configured to rotate about an axis 108 based on control of the valve's electrical component. For example, the electrical component can control the position of the plate between a closed position and one or more different open positions. Recirculated exhaust gas can be directed through the valve's mechanical component in direction 110. The position of the plate can control the amount of exhaust gas directed through the valve. For example, the plate can be in a closed position such that it prevents gas from being directed through the valve in direction 110. Optionally, the plate can be in one or more different open positions to control the amount of gas directed through the valve.

[0023] Figure 2 Showing Figure 1 A partial cross-sectional view of the electrical components of the electrically controlled valve shown. The valve includes a chamber 216 defined by a chamber end surface 230 and a rack end surface 232, and a plurality of inner surfaces of the chamber. The rack end surface is operatively coupled to a rack 222. A pump (not shown) directs fluid into the valve through a fluid inlet 204 and out of the valve through a fluid outlet 206. In one or more embodiments, the pump may be electrically controlled such that current is directed to the pump to control its operation. The fluid may be a gas, a liquid, or a gas-liquid mixture. In one embodiment, the fluid may be oil. Optionally, the fluid may be an alternative liquid and / or gas. The fluid is directed into the chamber through a passage 226. The rack is configured to move in a linear direction based on the amount of fluid in the chamber. As the fluid in the chamber increases, the rack moves in a first direction 234 and away from the chamber end surface. Alternatively, as the fluid in the chamber decreases, the rack moves in the opposite second direction 236 and toward the chamber end surface.

[0024] The rack and gear 202 are operatively coupled such that the gear rotates in response to linear movement of the rack in a first or second direction. For example, as the amount of fluid in the chamber increases, the rack moves in the first direction, and the gear rotates about its central axis in the first direction. The gear rotates in the opposite second direction in response to a decrease in the amount of fluid in the chamber and movement of the rack in the second direction. The gear and plate (in...) Figure 1 (As shown in the diagram) operatively coupled such that rotation of the gear causes rotation of the plate between a closed position and one or more different open positions. For example, rotational movement of the gear translates into rotational movement of the plate to control the position of the plate between the closed position and one or more open positions. Optionally, the plate may be operatively coupled to another device that controls the movement of the plate by linear movement rather than rotational movement. Optionally, the position of the plate may be controlled by the movement of any alternative device, component, feature, etc.

[0025] The electrically controlled valve also includes a displacement sensor 210 housed within the valve's electrical components. The displacement sensor may be referred to as a linear variable displacement transducer (LVDT) sensor, etc. Optionally, the valve may include alternative position and / or displacement sensors. In the illustrated embodiment, the displacement sensor includes a sensor rod 214, a spring 208, a solenoid 212, and a sensor coil 228. The displacement sensor is operatively coupled to a gear via the spring 218. Rotation of the gear in response to movement of the rack causes the spring to move in a linear direction. For example, the solenoid of the displacement sensor is indirectly coupled to the rack via the gear. Movement of the rack causes movement of the gear generated, detected, sensed, or otherwise measured by the displacement sensor. The position signal generated by the displacement sensor indicates the position of the electrically controlled valve between a closed position and one or more different open positions. For example, a position signal based on the position of the solenoid of the displacement sensor indirectly indicates the position of the valve plate. In one embodiment, the displacement sensor may generate a position voltage indicating the position of the valve. In another embodiment, the displacement sensor may generate or sense another output that may indicate the position of the valve.

[0026] Optionally, the electrically controlled valve may include additional or alternative components that control the movement of the valve plate between a closed position and one or more open positions. For example, the valve may contain no gears or racks and may have alternative systems that can control the operation of the valve. For example, the electrically controlled valve may have alternative linear components that move the valve plate in response to linear movement (e.g., rotate the plate, move it in a linear direction, etc.).

[0027] Optionally, the electrically controlled valve can have alternative configurations. For example, Figure 3 A side view of an electrically controlled valve 300 according to one embodiment is shown, and Figure 4 This shows a partial front view of an electrically controlled valve. Similar to... Figure 1 The valve shown is an electrically controlled valve comprising an electrical component 302 and a mechanical component 304 operatively coupled to the electrical component. The mechanical component includes a plate 306 configured to rotate about an axis (not shown) based on control of the valve's electrical component.

[0028] In the illustrated embodiment, the electrical portion includes an adapter plate 318 and a gasket 320, and a shaft 312 extending from the electrical portion toward the mechanical portion through the adapter plate. The mechanical portion includes a plate, a pin 310, a washer 314 receiving the end portion of the shaft, and a bushing 316 operatively coupled to the end portion of the shaft.

[0029] Figure 5 Showing Figure 3 and 4 A partial cross-sectional side view of the electrical components of the electrically controlled valve shown, and Figure 6A cross-sectional top view of the electrical components of the electrically controlled valve is shown. An axis extends along an axis (e.g., along the same axis as the rotation axis of the plate) through a channel in the gasket and a channel in the adapter plate. The adapter plate contains a chamber divided into a first recess 322 and a second recess 332. The gasket is coupled to the adapter plate such that a first portion 338 of the gasket is disposed within the first recess, and a second portion 340 of the gasket is disposed within the second recess.

[0030] In one or more embodiments, a pumping device (not shown) can pump fluid (e.g., gas, liquid, gas-liquid mixture) into and / or out of a first and second recess of the adapter plate. A first and second portion of the gasket moves within the first and second recesses, respectively, in response to fluid being directed into or out of them. For example, the first portion of the gasket can rotate to move toward a first surface 324 of the first recess, and the second portion of the gasket can rotate together with the first portion to move toward a first surface 334 of the second recess. Alternatively, the first portion of the gasket can rotate to move toward a second surface 326 of the first recess, and the second portion of the gasket can rotate to move toward a second surface 336 of the second recess. An electrically controlled valve can be coupled to a displacement sensor (not shown) that can generate a position signal based on the rotational movement of the gasket about an axis.

[0031] The movement of a gasket about the axis of a shaft controls the rotational movement of a plate in the mechanical part of the solenoid valve. For example, the rotational movement of the gasket within an adapter plate can be controlled by fluid flow directed into or from a first and second recess in the adapter plate. The gasket is coupled to the shaft, and the shaft is coupled to the plate. The position of the plate between one or more open and closed positions can be controlled based on the rotational position of the gasket. Optionally, the solenoid valve can have any alternative configuration or arrangement, and the plate of the solenoid valve can be controlled by any additional and / or alternative components of the electrical part of the solenoid valve.

[0032] Figure 7 Demonstrates the determination of electrically controlled valves (such as...) Figures 1 to 6 The flowchart 700 shows an embodiment of a method for determining the health status of an electrically controlled valve (as illustrated). One or more operations performed or associated with the method may be omitted, performed multiple times, performed in an alternative order, etc.

[0033] At 702, one or more processors receive the most recent measurement result (e.g., subsequent measurement value) of the electrically controlled valve. For example, the electrically controlled valve may be operatively coupled to a computer or alternative controller having or connected to the one or more processors, such as one or more microprocessors, field-programmable gate arrays, integrated circuits, etc. The electrically controlled valve may be wirelessly coupled to the one or more processors, or electrically coupled via one or more conductors, wires, etc.

[0034] Figure 8 An example of a measurement result 800 that can be received, sensed, or otherwise obtained by the one or more processors is illustrated. The measurement result may include an input current 802, an output current 804, and a position signal 806. The processor can receive the measurement result and / or sensed data from a displacement sensor and one or more sensors operatively coupled to a pump assembly. In one embodiment, the input current may be a current applied to a pump or pump assembly that pumps fluid into the chamber of an electrically controlled valve to change the valve's position. The output current may be a current output from the pump or pump assembly in response to the input current being input to the electrically controlled valve. The position signal may be generated by a displacement sensor that changes the value of the position signal based on the linear displacement of a solenoid within the displacement sensor of the electrically controlled valve.

[0035] In one or more embodiments, the processor may receive measurement results or sample data at predetermined scheduled intervals (e.g., once a day, once an hour, once a minute, once a second, etc.). Optionally, the processor may receive measurement results or sample data at unscheduled intervals. For example, the operator and / or controller (not shown) of an electrically controlled valve may manually control the operation of sensors associated with the electrically controlled valve to receive sensed data. The operator may request to receive the sampled data or sensed measurements based on the valve's operating conditions (e.g., if the valve appears to be malfunctioning), based on the valve's state (e.g., if the electrically controlled valve is being repaired, if the valve has been in operation or used for a predetermined period of time, such as 1 day, 1 week, 1 month, 1 year, 5 years, etc.), or for any alternative reason. Optionally, the processor may receive measurement results or sample data at unscheduled intervals based on the processor automatically requesting sensed data from the sensors of the electrically controlled valve. For example, the processor may determine that the electrically controlled valve may be malfunctioning and may request sensed data at times between predetermined scheduled intervals.

[0036] Return to Figure 7 At 704, the processor calculates the value associated with the most recent value determined and / or received at 702. For example, Figure 9An example of a calculated baseline value 900 associated with an electrically controlled valve according to one embodiment is shown. The calculated baseline value may be associated with input current, output current, and position signals (e.g., position voltage, etc.). In one embodiment, the calculated baseline value may include the sum of position signals, the difference between position signals, the difference between input current and output current, etc.

[0037] In one or more embodiments, the calculated baseline value may include a first average value 902A of the sum of position signals (e.g., position voltage, etc.) repeatedly sampled during a previous moving window and a first standard deviation 902B of the position signals or the sum of position signals; a second average value 904A and a second standard deviation 904B of the differences between position signals repeatedly sampled during a previous moving time window; and a third average value 906A and a third standard deviation 906B of the differences between input current and output current repeatedly sampled during a previous moving time window.

[0038] The most recently calculated baseline value (or a baseline value calculated using subsequent measurements) can be compared with a calculated baseline value based on previous measurements of input current, output current, and position signals. The difference between the most recently calculated baseline value and the previous baseline value can indicate the health status of the electronically controlled valve. For example, previous measurements of input current, output current, and position signals can be collected, stored, maintained, etc., by the one or more processors. In one embodiment, the processor can store a predetermined number of previous measurements.

[0039] For example, Figure 10A timeline 1000, comprising a moving time window 1008, is shown according to one embodiment. The timeline includes a start time 1002, which may represent a day, date, time of day, etc. The timeline includes a moving time window 1008 extending between the start time and a first stop time 1004. The moving time window may also be referred to as a moving daily average or a moving time average. In one or more embodiments, the moving time window may be a time length of approximately 50 days between the start time and the first stop time, or it may be 100 days, 200 days, etc. Optionally, the moving time window may be associated with the amount of repeatedly sampled data. For example, the moving time window may be based on the processor receiving 50 sets of sampled baseline data, 100 sets of sampled baseline data, 200 sets of sampled baseline data, etc. The size and / or length of the moving time window may remain constant, wherein the start time and the first stop time shift to maintain a constant moving time window. For example, the moving time window may have a predetermined length of 180 days, such that the processor can store baseline values ​​of data received during the 180-day moving time window. On day 181, the processor can remove or delete data associated with day 1, and on day 182, the processor can remove or delete data associated with day 2. Optionally, the moving time window can have alternative predefined rules, requirements, etc.

[0040] Return to Figure 7 At point 706, it is determined whether the baseline value is greater than the calculated value. New or recent data is evaluated on a daily or predetermined timeline basis and compared with the baseline data of the solenoid valve. For example, the most recent values ​​associated with the input current, output current, and position signal during previous measurements can be compared with the baseline values ​​associated with the input current, output current, and position signal. For example, (i) the input current, output current, and position signal can be sensed or measured; (ii) the baseline value can be calculated or determined based on the sensed or measured input current, output current, and position signal; (iii) subsequent and / or additional sensing or measurement of the input current, output current, and position signal can be performed or conducted (e.g., at a later time); and (iv) the health status of the solenoid valve can be determined based on comparing the values ​​associated with subsequent sensing with the baseline values ​​associated with previous sensing.

[0041] In one or more embodiments, the most recent values ​​of the first, second, and third means and standard deviations can be compared with the first, second, and third means and standard deviations of previous data. For example, the processor compares six different variables to determine whether the variables indicate a healthy or unhealthy electronically controlled valve. If the most recent baseline value is greater than the calculated value, the process proceeds to step 308, and the most recent baseline value may be associated with an abnormal sequence that could indicate an unhealthy state of the electronically controlled valve.

[0042] Alternatively, if the most recent baseline value is less than the calculated value, the process proceeds to 710, and the most recent baseline value may be associated with a normal sequence that can indicate the good health of the electronically controlled valve. Optionally, the most recent baseline value can be compared with a previous baseline value in an alternative manner, such that an abnormal sequence can be indicated by the most recent baseline value being less than a previously calculated baseline value. Optionally, an abnormal sequence can be indicated by alternative comparison methods between the most recent baseline value and a previously calculated baseline value (e.g., comparison of mean, percentage, alternative mean and / or standard deviation, etc.).

[0043] In one or more embodiments, the processor can determine the day value being evaluated to ensure that recent changes to the evaluated data do not skew normal data. For example, the processor can determine whether a calculated baseline value comprising six variables should be recalculated and / or re-evaluated. The processor can determine whether the data associated with a particular evaluation day is a normal or abnormal day. If the day is determined to be normal, the processor can update the calculated baseline value to include the change offset or average offset in the entire dataset. Alternatively, if the day is determined to be abnormal, the processor can ignore recent data and may not update the calculated baseline value.

[0044] For example, at 712, the processor determines whether the ratio of the anomalous sequence to the normal sequence is outside a predetermined limit. If the day value being evaluated is considered anomalous, the anomalous evaluation can be represented by a change offset or average offset based on at least one of six variables. If the number of anomalous points exceeds or is outside the predetermined limit relative to the number of normal points, the day is determined to be an anomalous day, and the process proceeds to 714.

[0045] In one or more embodiments, the abnormal day can be outside the moving time window. For example, an abnormal day can be identified as... Figure 10 The point 1022, extending between the first stop time 1004 and the second stop time 1006, is shown within the most recent timeline 1010. For example, the start time could represent day T-210, the first stop time could represent day T-30, and the second stop time could represent T-0. If a day is determined to be an anomaly, it may fall within the most recent timeline and may be too close. Recent data can skew the data associated with the moving time window, and therefore recent data may be ignored. The method flow can return to 302, and the method can repeat for a predetermined time length for a predetermined number of datasets to be collected.

[0046] Alternatively, if the number of outliers is within a predetermined limit relative to the number of normal points, the day is determined to be a normal day, and the process proceeds to 716. For example, the day could be determined as point 1020 falling within the moving time window between the start time and the first stop time. If the most recent baseline value differs from the calculated baseline value associated with the moving time window, falls outside the predetermined range indicating an outlier sequence, and the day is determined to be a normal day (relative to an outlier day), the process proceeds to 718. At 718, a new baseline can be calculated based on the value associated with the most recent value. For example, the six variables can be recalculated or determined based on the most recent outlier sequence found on a normal assessment day.

[0047] Optionally, the processor may use one or more different methods to update, recalculate, or reevaluate the baseline values. In one embodiment, the processor may calculate a fourth mean and a fourth standard deviation of the sum of position signals repeatedly sampled during a subset of the previous moving time window; calculate a fifth mean and a fifth standard deviation of a first difference between position signals repeatedly sampled during a subset of the previous moving time window; and calculate a sixth mean and a sixth standard deviation of a second difference between input and output currents repeatedly sampled during a subset of the previous moving time window. The processor may compare the fourth mean and fourth standard deviation with the first mean and first standard deviation; compare the fifth mean and fifth standard deviation with the second mean and second standard deviation; and compare the sixth mean and sixth standard deviation with the third mean and third standard deviation. The processor may update the baseline values ​​(e.g., the first mean and first standard deviation, the second mean and second standard deviation, and the third mean and third standard deviation) based on comparisons between twelve datasets.

[0048] In one or more embodiments, the processor may determine a set of comparison values ​​indicating a comparison of a fourth average and a fourth standard deviation with a first average and a first standard deviation; a comparison of a fifth average and a fifth standard deviation with a second average and a second standard deviation; and a comparison of a sixth average and a sixth standard deviation with a third average and a third standard deviation. Optionally, the processor may map the set of comparison values ​​to different values ​​representing the health status of the electrically controlled valve to determine the valve's health status. For example, Figure 11Table 1100 illustrates an example of mapping the set of comparison values ​​to determine the health status of a valve. The table includes a first column 1102 indicating the case or evaluation number. The table also includes columns 1104 through 1114, which indicate each of six comparison values ​​used to compare different mean and standard deviation values. For example, columns 1104 through 1114 indicate whether one of the comparison values ​​is outside a predetermined limit, exceeds a predetermined limit, etc.

[0049] The table includes an eighth column, 1116, based on data associated with columns 1104 to 1114. The processor can determine the health status of the electrically controlled valve based on the data in column 1116. For example, the processor can determine whether the electrically controlled valve is healthy or unhealthy based on the data indicated in column 1116, and can transmit the determined valve health status in a ninth column, 1118. In one or more embodiments, the processor can determine, based on data analysis, that the valve health status is uncertain and can indicate to the valve operator that the valve requires further analysis. Optionally, the processor can determine the health status of specific components of the valve, and only those specific components require repair or replacement. For example, the processor can determine that there is a problem with the solenoid of the valve's displacement sensor; another part of the position sensor is faulty; there is an oil leak in the valve; the valve plate is stuck; the electrically controlled valve is overheating; there is a short circuit or damaged wiring in the valve, etc.

[0050] The processor can determine the health status of the electrically controlled valve based on data analysis from position sensors and input and output currents. In one or more embodiments, the processor can determine, based on the valve's health status, that the valve or a portion of the valve requires repair or replacement. Optionally, the processor can instruct the valve operator that the valve needs repair and / or replacement (e.g., via an output device, audio and / or visual alarm, etc.). Optionally, the processor can determine that further evaluation is needed to determine the valve's health status. Optionally, the processor can determine that the fault is unknown, but the electrically controlled valve is still operable. Optionally, the processor can determine that the valve needs to be replaced, and can determine an emergency situation requiring valve replacement.

[0051] In one or more embodiments of the subject matter described herein, a method includes measuring an input current input to an electrically controlled valve to change the position of the valve. An output current output from the electrically controlled valve in response to the input current input to the valve is measured. A position signal indicating the position of the valve is generated using a sensor coupled to the valve. A baseline value associated with the input current, the output current, and the position signal is calculated. The health status of the electrically controlled valve is determined by comparing the baseline value associated with the input current, the output current, and the position signal with subsequent measurements associated with the input current, the output current, and the position signal.

[0052] Optionally, the method may include repairing or replacing the electrically controlled valve based on the health status.

[0053] Optionally, the measured input current can be applied to a pumping device that pumps fluid into the chamber of the electrically controlled valve to change the position of the valve.

[0054] Optionally, the measured output current can be output from a pumping device that pumps fluid into the chamber of the electrically controlled valve to change the position of the electrically controlled valve.

[0055] Optionally, the position signal can be generated as a position voltage measured by a displacement sensor, which changes the value of the position voltage based on the linear displacement of the solenoid within the electronically controlled valve.

[0056] Optionally, the position signal may be or include position voltages, and the calculated baseline value may include the sum of the position voltages.

[0057] Optionally, the position signal may be or include position voltages, and the calculated baseline value may include the difference between the position voltages.

[0058] Optionally, the calculated baseline value may include the difference between the input current and the output current.

[0059] Optionally, the position signal may be or include a position voltage, and the calculated baseline value may include: a first average and a first standard deviation of the sum of the position voltages repeatedly sampled during a previous movement time window; a second average and a second standard deviation of a first difference between the position voltages repeatedly sampled during the previous movement time window; and a third average and a third standard deviation of a second difference between the input current and the output current repeatedly sampled during the previous movement time window.

[0060] Optionally, determining the health status of the electronically controlled valve may include calculating a fourth average and a fourth standard deviation of the sum of the position voltages repeatedly sampled during a subset of the previous moving time window, a fifth average and a fifth standard deviation of the first difference between the position voltages repeatedly sampled during the subset of the previous moving time window, and a sixth average and a sixth standard deviation of the second difference between the input current and the output current repeatedly sampled during the subset of the previous moving time window. The fourth average and the fourth standard deviation are compared with the first average and the first standard deviation, the fifth average and the fifth standard deviation are compared with the second average and the second standard deviation, and the sixth average and the sixth standard deviation are compared with the third average and the third standard deviation.

[0061] Optionally, determining the health status of the electrically controlled valve may include determining a set of comparison values, the set of comparison values ​​indicating comparison of the fourth average value and the fourth standard deviation with the first average value and the first standard deviation, comparison of the fifth average value and the fifth standard deviation with the second average value and the second standard deviation, and comparison of the sixth average value and the sixth standard deviation with the third average value and the third standard deviation; and mapping the set of comparison values ​​to different values ​​of the health status of the electrically controlled valve to determine the health status of the electrically controlled valve.

[0062] In one or more embodiments of the subject matter described herein, a system includes: an electrically controlled valve that receives an input current to change its position; and one or more sensors configured to measure the input current input to the electrically controlled valve and to measure an output current output from the electrically controlled valve in response to the input current input to the electrically controlled valve. The sensors generate a position signal indicating the position of the electrically controlled valve. The system includes one or more processors that calculate a baseline value associated with the input current, the output current, and the position signal. The processors determine the health status of the electrically controlled valve by comparing the baseline value associated with the input current, the output current, and the position signal with subsequent measurements associated with the input current, the output current, and the position signal.

[0063] Optionally, the measured input current is applied to a pumping device that pumps fluid into the chamber of the electrically controlled valve to change the position of the valve.

[0064] Optionally, the measured output current is output from a pumping device that pumps fluid into the chamber of the electrically controlled valve to change the position of the electrically controlled valve.

[0065] Optionally, the generated position signal is output by a displacement sensor, which changes the value of the position signal based on the linear displacement of the solenoid within the electronically controlled valve.

[0066] Optionally, the position signal may be or may include position voltages, and the calculated baseline value includes the sum of the position voltages and the differences between the position voltages.

[0067] Optionally, the position signal may be or include a position voltage and a baseline value calculated as the difference between the input current and the output current.

[0068] Optionally, the position signal may be or include a position voltage, and the calculated baseline value may include: a first average and a first standard deviation of the sum of the position voltages repeatedly sampled during a previous movement time window; a second average and a second standard deviation of a first difference between the position voltages repeatedly sampled during the previous movement time window; and a third average and a third standard deviation of a second difference between the input current and the output current repeatedly sampled during the previous movement time window.

[0069] Optionally, the one or more processors may calculate a fourth average and a fourth standard deviation of the sum of the location voltages repeatedly sampled during a subset of the previous moving time window, a fifth average and a fifth standard deviation of the first difference between the location voltages repeatedly sampled during the subset of the previous moving time window, and a sixth average and a sixth standard deviation of the second difference between the input current and the output current repeatedly sampled during the subset of the previous moving time window, and may compare the fourth average and the fourth standard deviation with the first average and the first standard deviation, compare the fifth average and the fifth standard deviation with the second average and the second standard deviation, and compare the sixth average and the sixth standard deviation with the third average and the third standard deviation.

[0070] In one or more embodiments of the subject matter described herein, a method includes measuring an input current input to an electrically controlled valve to change the position of the valve. The method includes measuring an output current output from the electrically controlled valve in response to the input current input to the valve. A position voltage is measured using a sensor coupled to the electrically controlled valve. The position voltage indicates the position of the electrically controlled valve. A baseline value is calculated associated with the input current, the output current, and the position voltage. The calculated baseline value includes: a first average and a first standard deviation of the sum of the position voltages repeatedly sampled during a previous shift time window; a second average and a second standard deviation of a first difference between the position voltages repeatedly sampled during the previous shift time window; and a third average and a third standard deviation of a second difference between the input current and the output current repeatedly sampled during the previous shift time window. Calculate a fourth average and a fourth standard deviation of the sum of the position voltages repeatedly sampled during a subset of the previous moving time window; calculate a fifth average and a fifth standard deviation of the first difference between the position voltages repeatedly sampled during the subset of the previous moving time window; and calculate a sixth average and a sixth standard deviation of the second difference between the input current and the output current repeatedly sampled during the subset of the previous moving time window. Compare the fourth average and the fourth standard deviation with the first average and the first standard deviation; compare the fifth average and the fifth standard deviation with the second average and the second standard deviation; and compare the sixth average and the sixth standard deviation with the third average and the third standard deviation. Determine the health status of the electronically controlled valve by determining a set of comparison values, which indicate comparing the fourth average and the fourth standard deviation with the first average and the first standard deviation, comparing the fifth average and the fifth standard deviation with the second average and the second standard deviation, and comparing the sixth average and the sixth standard deviation with the third average and the third standard deviation. The health status of the electronically controlled valve is determined by mapping the set of comparison values ​​to the different values ​​of the health status of the electronically controlled valve.

[0071] As used herein, the terms “processor” and “computer,” as well as related terms such as “processing device,” “computing device,” and “controller,” may refer not only to those integrated circuits referred to in the art as computers, but may also refer to microcontrollers, microcomputers, programmable logic controllers (PLCs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and other programmable circuits. Suitable memory may comprise, for example, computer-readable media. Computer-readable media may be, for example, random access memory (RAM), computer-readable non-volatile media, such as flash memory. The term “non-transitory computer-readable medium” means a tangible computer-based device implemented for storing information, such as computer-readable instructions, data structures, program modules and submodules, or other data, both short-term and long-term, in any device. Therefore, the methods described herein may be encoded in a tangible non-transitory computer-readable medium, comprising, but not limited to, executable instructions embodied in storage devices and / or memory devices. Such instructions, when executed by a processor, cause the processor to perform at least a portion of the methods described herein. Thus, the term includes tangible computer-readable media, including but not limited to non-transitory computer storage devices, including but not limited to volatile and non-volatile media, and removable and non-removable media, such as firmware, physical and virtual storage devices, CD-ROMs, DVDs, and other digital sources, such as networks or the Internet.

[0072] Unless the context clearly indicates otherwise, the singular forms “a / an” and “the” include plural indicators. “Optional” or “optionally” means that the event or situation subsequently described may or may not occur, and the description may include instances where the event occurred and instances where the event did not occur. Approximate language, as used throughout the specification and terms herein, may be used to modify any quantitative representation that allows for variation without altering the fundamental function it may involve. Therefore, values ​​modified by one or more terms such as “about,” “substantially,” and “approximately” may not be limited to the specified precise value. In at least some cases, approximate language may correspond to the precision of the instrument used to measure the value. Here and throughout the specification and terms, unless the context or language indicates otherwise, scope limitations may be combined and / or interchanged, and such scopes may be identified and include all subscopes contained therein.

[0073] This written description uses examples to disclose embodiments, including best practices, and enables those skilled in the art to practice the embodiments, including making and using any apparatus or system and performing any incorporated methods. The terms define the patentable scope of this disclosure and include other examples that may occur to those skilled in the art. Such other examples are intended to be within the scope of the terms if they have structural elements that are not different from the literal language of the terms, or if such other examples contain equivalent structural elements that are not substantially different from the literal language of the terms.

Claims

1. A method for assessing the health status of an electrically controlled valve, comprising: An input current is applied to the pump unit so that the pump unit directs fluid into the chamber of the electrically controlled valve to change the position of the electrically controlled valve; Measure the input current applied to the pump assembly to change the position of the electronically controlled valve; Measure the output current output from the pump unit in response to a position change in the pump unit and the electronically controlled valve when the input current is applied to them; A position signal is generated using a sensor coupled to the solenoid valve, the position signal indicating the position of the solenoid valve; Calculate a baseline value associated with the input current, the output current, and the position signal, wherein the baseline value is based on measured input current values, measured output current values, and measured position signal values ​​repeatedly sampled during a previous movement time window, and wherein the calculated baseline value includes the difference between the measured input current values ​​and the measured output current values ​​repeatedly sampled during the previous movement time window; and The health status of the electrically controlled valve is determined by comparing the baseline value associated with the input current, the output current, and the position signal with subsequent measurements associated with the input current, the output current, and the position signal.

2. The method according to claim 1, further comprising: Repair or replace the electrically controlled valve based on the stated health status.

3. The method according to claim 1, wherein, The position signal is generated as a position voltage measured by a displacement sensor, which changes the value of the position voltage based on the linear displacement of the solenoid within the electronically controlled valve.

4. The method according to claim 1, wherein, The position signal includes position voltages, and the calculated baseline value includes the sum of the position voltages.

5. The method according to claim 1, wherein, The position signal includes position voltages, and the calculated baseline value includes the difference between the position voltages.

6. The method according to claim 1, wherein, The position signal includes position voltage, and the calculated baseline value includes: a first average and a first standard deviation of the sum of the position voltages repeatedly sampled during the previous movement time window; a second average and a second standard deviation of a first difference between the position voltages repeatedly sampled during the previous movement time window; and a third average and a third standard deviation of a second difference between the measured input current value and the measured output current value repeatedly sampled during the previous movement time window.

7. The method according to claim 6, wherein, Determining the health status of the electrically controlled valve includes: Calculate the fourth average and fourth standard deviation of the sum of the location voltages repeatedly sampled during a subset of the previous moving time window, the fifth average and fifth standard deviation of the first difference between the location voltages repeatedly sampled during a subset of the previous moving time window, and the sixth average and sixth standard deviation of the second difference between the measured input current value and the measured output current value repeatedly sampled during a subset of the previous moving time window; as well as The fourth average and the fourth standard deviation are compared with the first average and the first standard deviation; the fifth average and the fifth standard deviation are compared with the second average and the second standard deviation; and the sixth average and the sixth standard deviation are compared with the third average and the third standard deviation.

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