CN115144683B - Electromagnetic valve fault detection method and system - Google Patents
Electromagnetic valve fault detection method and system Download PDFInfo
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- CN115144683B CN115144683B CN202211081063.5A CN202211081063A CN115144683B CN 115144683 B CN115144683 B CN 115144683B CN 202211081063 A CN202211081063 A CN 202211081063A CN 115144683 B CN115144683 B CN 115144683B
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Abstract
The invention discloses a fault detection method for an electromagnetic valve, which is used for detecting the electromagnetic valve in a hydraulic control assembly after the assembly is finished, and comprises the following steps: presetting a parameter setting range for detection; electrifying the coil and acquiring coil current data; acquiring a current climbing data section and a current stabilization data section; judging whether the coil is a qualified piece or not according to the average value of the current stabilization data segment; dividing the current climbing data segment into n data segments to be screened, and calculating the slope and the fitting degree of each data segment to be screened; screening out the selected data segment according to the slope and the fitting degree; and screening the maximum value Imax of the coil current data from the selected data section, and judging whether the electromagnetic valve is a qualified piece according to the Imax. A solenoid valve fault detection system capable of implementing the method is also disclosed. By applying the invention, the electromagnetic valve in the hydraulic control assembly can be detected after the hydraulic control assembly is assembled, possible faults can be found in time, and potential safety hazards are avoided.
Description
Technical Field
The invention relates to the technical field of automatic detection, in particular to a method and a system for detecting faults of an electromagnetic valve.
Background
An automobile electronic stability control system (ESC) is the key of an automobile active safety technology and comprises a sensor, an Electronic Control Unit (ECU) and an execution mechanism (HCU), wherein the running state of an automobile is monitored through the sensor, and the ECU controls the longitudinal running stability and the transverse running stability of the automobile through the HCU under an emergency condition according to monitoring data. The electromagnetic valve is a core component in the HCU, and is controlled by an ECU signal to realize opening and closing, so that the opening and closing of a liquid path are controlled, and the conventional, pressure maintaining, pressure reducing and pressurizing braking processes are realized. As shown in fig. 1, the ECU assembly 1 is provided with a coil 10, and the solenoid valve 20 on the HCU assembly 2 is aligned and extended into the coil 10 during assembly, so that when the ECU assembly is operated, the coil 10 is energized, the movable iron core in the solenoid valve 20 is attracted to be displaced by the electromagnetic force generated by the coil, and in cooperation with the return spring in the solenoid valve 20, the solenoid valve 20 can be opened and closed by the action of the movable iron core.
In order to ensure the product quality, the quality of each part is detected before assembly in the related art, and the whole product is qualified after the quality of each part is confirmed to be qualified. However, the quality detection idea has the following problems: in the process of assembling the ECU assembly and the HCU assembly, the electromagnetic valve is likely to be collided and impacted, the electromagnetic valve which is qualified in detection before assembly is in an unqualified state after assembly, and if the electromagnetic valve is not detected, serious potential safety hazards are likely to be caused after a product enters the market.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the related art to a certain extent, and therefore the invention adopts the following technical scheme: a fault detection method for an electromagnetic valve is used for detecting the electromagnetic valve in a hydraulic control assembly after assembly is finished, wherein a coil is arranged in the hydraulic control assembly, and the electromagnetic valve extends into the coil;
the method comprises the following steps:
s100: generating a parameter setting range for detection according to the hydraulic control assembly, wherein the parameter setting range comprises a coil conduction current range and a hump peak current range;
s200: electrifying the coil according to a set time, acquiring current data after the coil is electrified, and performing low-pass filtering processing on the current data to obtain coil current data;
s300: the coil current data form a current data section, and a current climbing data section and a current stabilization data section are identified and intercepted from the current data section;
s400: calculating the average value of the current stabilization data segment, judging whether the average value falls into the range of the coil conducting current, if so, judging that the coil is a qualified piece, and continuing to perform the step S500; if not, judging that the coil is an unqualified coil, finishing detection, and performing the step S100 again after the coil is replaced;
s500: dividing the current climbing data segment into n data segments to be screened, linearly fitting the n data segments to be screened, and calculating the slope and the fitting degree of each data segment to be screened;
s600: taking the data segment to be screened with the fitting degree larger than a first set threshold value as a data segment to be analyzed, screening a slope corresponding to the data segment to be analyzed as a slope to be analyzed, comparing the screened slope to be analyzed with 0 to obtain a slope to be analyzed closest to 0, and taking the data segment to be analyzed corresponding to the slope to be analyzed closest to 0 as a selected data segment;
s700: screening out the maximum value Imax of coil current data from the coil current data contained in the selected data section, judging whether the Imax falls into the range of hump peak current, if so, judging that the electromagnetic valve is a qualified piece, and ending the detection; if not, judging that the electromagnetic valve is an unqualified one, and finishing the detection;
the coil conduction current range is a first reference value R +/-8%, and the hump peak current range is a second reference value P +/-10%.
The invention has the following beneficial effects: when the coil is electrified, the movable iron core in the electromagnetic valve is driven to move due to the electromagnetic induction effect, and after the movable iron core moves, an air gap is increased and magnetic flux is increased, so that counter electromotive force is generated to influence the increase of the current of the coil, and a hump is formed on a conducting current curve of the coil. The scheme of the invention utilizes the principle to electrify the coil after the hydraulic control assembly is assembled and collect current data after the coil is electrified. And finally, judging whether the hump peak current falls into a set hump peak current range or not. Therefore, whether the moving distance of the movable iron core is normal or not is judged, whether the electromagnetic valve has a fault or not is judged, and the problem that potential safety hazards exist after the hydraulic control assembly is on the market is solved.
Preferably, the coil conduction current range is a first reference value R ± 8%, the hump peak current range is a second reference value P ± 10%, the predetermined time is a selected value between 100ms and 300ms, and the first set threshold is a selected value between 0.85 and 0.99.
Preferably, between step S500 and step S600, further comprising: s510: obtaining the change trend of the slope according to the calculated values of the n slopes, judging whether the change trend of the slope is changed from a positive number to a negative number, and then from the negative number to the positive number, and if so, continuing to perform the step S600; if not, the electromagnetic valve is judged to be a qualified piece, and the detection is finished. Through the change trend of the slope, whether the coil conducting current is in a stage of climbing all the way to increase to a stable state after the current appears or a hump stage of decreasing and then increasing in the midway can be judged, and whether the hump peak current exists or not can be judged. Whether the movable iron core can move or not can be judged according to the method, so that the fault condition of the electromagnetic valve can be judged more accurately.
Preferably, the parameter setting range in step S100 further includes a hump peak occurrence time range; and, the step S700 further includes: acquiring corresponding time t when the maximum value Imax of the coil current data appears, and judging whether the time t falls into a hump peak value appearing time range in the step S700; if Imax falls into the range of the peak current of the hump and t falls into the range of the time for the peak value of the hump to appear, judging that the electromagnetic valve is a qualified piece, and finishing the detection; and if Imax does not fall into the range of the peak current of the hump or t does not fall into the range of the time for the peak value of the hump to appear, judging that the electromagnetic valve is an unqualified piece, and finishing the detection. The moving iron core moves to cause the increase of the air gap and the increase of the magnetic flux, so that the hump peak current appears, and therefore, the moving reaction time of the moving iron core causes the appearance time of the hump peak current to be different. Therefore, whether the electromagnetic valve has a fault or not can be judged more accurately by increasing the evaluation index of the hump peak value occurrence time.
Preferably, the hump peak appearance time range is a second reference value P ± 10%.
Preferably, in step S300, the coil current data I greater than the second reference value × C in the current data segment is segmented, the maximum value and the minimum value of the current data I in each segment are compared, and if the difference between the two values is smaller than a second set threshold, the corresponding current data segment is determined as a current stabilization data segment; and judging the current data segment between the generation of the coil current data and the occurrence of the current stable data segment as a current climbing data segment. And analyzing and intercepting the current climbing data segment and the current stabilization data segment from the current data segment by the analysis method.
Preferably, the set time is a selected value between 0.05ms and 0.1ms and the second set threshold is a selected value between 0.005mA and 0.01 mA.
Preferably, in the step S500, each data segment to be screened has m coil current data, and the nth data segment to be screened includes the nth coil current data, the (n + m-1) th coil current data and coil current data therebetween; wherein m is more than or equal to 3 and less than or equal to 6.
The invention also adopts the following technical scheme: a solenoid valve fault detection system for implementing the solenoid valve fault detection method according to any one of claims 1 to 8, the detection system comprising a control unit, a current data acquisition unit, a CAN communication module and a low-pass filtering module, and the current data acquisition unit, the CAN communication module and the low-pass filtering module are in signal connection with the control unit; the control unit sends a power-on/off instruction to a hydraulic control assembly through the CAN communication module, and the hydraulic control assembly powers on or powers off the coil according to the power-on/off instruction; the control unit acquires current data of the energized coil through the current data acquisition unit, and performs low-pass filtering on the current data through the low-pass filtering module to obtain coil current data.
Preferably, the current data acquisition unit includes signal connection's current sensor, sampling circuit and data acquisition card in proper order, data acquisition card with the control unit signal connection, sampling circuit passes through current sensor and gathers the current signal of coil, data acquisition card will current signal converts digital signal and sends to the control unit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a related art ECU assembly assembled with a HCU assembly;
FIG. 2 is a flow chart of a method for detecting a failure of a solenoid valve according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of current value versus time after energization when no solenoid valve is inserted in the coil;
FIG. 4 is a schematic diagram of current value-time after energization when a qualified solenoid valve is inserted into a coil;
FIG. 5 is a flowchart of a method for detecting a failure in a solenoid valve according to a second embodiment;
FIG. 6 is a flowchart illustrating a method for detecting a failure of a solenoid valve according to a third embodiment;
FIG. 7 is a schematic diagram of a failure detection system for a solenoid valve according to a fourth embodiment.
The system comprises an ECU (electronic control Unit) assembly 1, a coil 10, an HCU assembly 2, an electromagnetic valve 20, a control unit 3, a current data acquisition unit 4, a current sensor 40, a sampling circuit 41, a data acquisition card 42, a CAN (controller area network) communication module 6, a low-pass filtering module 7, a current climbing stage 70, a hump 8 and a current stabilization stage 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Embodiments of the present invention are described below with reference to the drawings.
The first embodiment is as follows: the embodiment provides a method for detecting a failure of an electromagnetic valve, which is used for detecting an electromagnetic valve in a hydraulic control assembly after assembly, specifically, in the embodiment, an automotive electronic stability control system (ESC) is taken as an example for description, and it can be understood that the method provided in the embodiment may also be used for detecting an electromagnetic valve in other hydraulic control assemblies equipped with an electromagnetic valve after assembly. Some electronic stability control systems (ESC) for automobiles have problems after being used for a short time (having a large difference from the design life), and cannot complete braking correctly in an emergency, and the reason for analyzing the ESC may be failure of the solenoid valve, but the failure of the solenoid valve in a short time after strict quality detection is not normal. Through research and analysis of the inventor of the application, the electromagnetic valve is found to be damaged due to the fact that the electromagnetic valve is likely to be impacted in the process of assembling the ECU assembly and the HCU assembly, and the electromagnetic valve is particularly characterized in that the movable iron core cannot normally move. For this reason, the inventor of the present application proposes the above-described detection method in the present embodiment to detect a faulty solenoid valve in the assembled ESC and prevent the solenoid valve from entering the market. As shown in fig. 2, the detection method includes the steps of:
s100: generating a parameter setting range for detection according to the hydraulic control assembly, wherein the parameter setting range comprises a coil conduction current range and a hump peak current range;
s200: electrifying the coil according to a specified time, acquiring current data after the coil is electrified, and performing low-pass filtering processing on the current data to obtain coil current data;
s300: the coil current data form a current data section, and a current climbing data section and a current stabilization data section are identified and intercepted from the current data section;
s400: calculating the average value of the current stabilization data segment, judging whether the average value falls into the conduction current range of the coil, if so, judging that the coil is a qualified piece, and continuing to perform the step S500; if not, judging that the coil is a non-qualified piece, finishing detection, and after the coil is replaced, re-performing the step S100;
s500: dividing the current climbing data segment into n data segments to be screened, linearly fitting the n data segments to be screened, and calculating the slope and the fitting degree of each data segment to be screened;
s600: taking the data segment to be screened with the fitting degree larger than a first set threshold value as a data segment to be analyzed, screening a slope corresponding to the data segment to be analyzed as a slope to be analyzed, comparing the screened slope to be analyzed with 0 to obtain a slope to be analyzed closest to 0, and taking the data segment to be analyzed corresponding to the slope to be analyzed closest to 0 as a selected data segment;
s700: screening out the maximum value Imax of coil current data from the coil current data contained in the selected data section, judging whether the Imax falls into the range of hump peak current, if so, judging that the electromagnetic valve is a qualified piece, and ending the detection; if not, the electromagnetic valve is judged to be a failed element, and the detection is finished.
The principle of the detection method is described as follows: when the coil is electrified, current is generated on the coil, the coil current value is defined as I, the coil current value I changes along with time T in the initial stage of electrification, a coordinate system is formed by taking the time T as a horizontal axis and the coil current value I as a vertical axis, and the coil current value I can form a current curve in the coordinate system. When the coil is energized alone, as shown in fig. 3, in the process from the occurrence of the coil current value I to the stabilization of the coil current value I, there are a current climbing phase 7 and a current stabilization phase 8. When the electromagnetic valve extends into the coil and the coil is electrified, the movable iron core in the electromagnetic valve is driven to move due to the electromagnetic induction effect, and the air gap and the magnetic flux are increased after the movable iron core moves, so that the coil current is increased due to the generated back electromotive force. As shown in fig. 4, a hump 70 is formed on the current ramp phase 7, and correspondingly, a hump peak current exists. When the electromagnetic valve has faults, the movable iron core can move abnormally, and hump peak current abnormity is caused. The detection method provided by the application utilizes the principle, the coil is electrified after the ESC is assembled, current data after the coil is electrified are collected, and the hump peak current in the current data is found out by analyzing the current data. And judging whether the found hump peak current is normal or not according to whether the hump peak current falls into a set hump peak current range or not. Therefore, whether the moving distance of the movable iron core is normal or not can be judged, whether the electromagnetic valve has a fault or not can be judged, and the situation that a hydraulic control assembly with potential safety hazards flows into the market is avoided.
The coil conduction current range mentioned in the detection method is calculated according to the resistance of the coil in the hydraulic control assembly, that is, after the voltage for electrifying the coil and the resistance of the coil are clarified, the reference value of the coil conduction current can be calculated through the voltage and the resistance, and the reference value is named as a first reference value R in the embodiment. The coil conduction current range is set to R ± 8% in consideration of the error range of data processing. Specifically for the ESC of this embodiment, the first reference value R is 2.2mA. The range of the hump peak current needs to be obtained through experimental tests, specifically, a qualified coil and a qualified solenoid valve are selected for carrying out experiments to obtain data, and finally, a hump peak current reference value corresponding to the detected hump peak current is obtained, which is named as a second reference value P in this embodiment. The coil conduction current range is set to P ± 10% in consideration of the error range of data processing. Specifically for the ESC of this example, the second reference value P is 1.24mA. The predetermined time is 200ms, and the first set threshold is 0.9. Wherein the prescribed time may be a selected value between 100ms and 300ms and the first set threshold may be a selected value between 0.85 and 0.99.
The data analysis process is described in steps S500 and S600 in the above detection method, a fitting degree value can be obtained by performing linear fitting on n data segments to be screened, and the fitting degree can represent the fitting degree, the closer to 1, the higher the reliability is, in this embodiment, the data segment to be screened corresponding to the fitting degree greater than 0.9 is screened out as the data segment to be analyzed. And taking the slope corresponding to the data segment to be analyzed as the slope to be analyzed, and then comparing the screened slope to be analyzed with 0 to obtain the slope to be analyzed which is closest to 0, wherein it is easy to understand that the value of the slope close to 0 indicates that the coil current data in the corresponding data segment to be analyzed is positioned at the top point, so that the data segment to be analyzed corresponding to the slope to be analyzed which is closest to 0 is taken as the selected data segment. The maximum value Imax of the coil current data, namely the hump peak current, can be found from the selected data section.
Specifically, in this embodiment, in step S300, the coil current data I greater than the second reference value × C in the current data segment is segmented, the maximum value and the minimum value of the current data I in each segment are compared, and if the difference between the two values is smaller than the second set threshold, the corresponding current data segment is determined as the current stabilization data segment; and judging the current data segment between the generation of the coil current data and the occurrence of the current stable data segment as a current climbing data segment. Wherein C is a coefficient, and C is 1.2 in this embodiment, which is set to ensure that the segmented coil current data I is located behind the hump peak current, and to avoid the hump peak current from influencing the interception result. The current climbing data section and the current stable data section can be analyzed and intercepted from the current data section by the analysis method. Further, the set time is 0.06ms, and the second set threshold is 0.008mA. Wherein the set time may be a selected value between 0.05ms and 0.1ms and the second set threshold may be a selected value between 0.005mA and 0.01 mA.
In step S500, the current ramp data segment is divided into n data segments to be filtered, and in this embodiment, the coil current data in the current ramp data segment is segmented in the following manner: dividing the current climbing data segment into n data segments to be screened, wherein each data segment to be screened has m coil current data, and the nth data segment to be screened comprises the nth coil current data, the (n + m-1) th coil current data and the coil current data between the nth and the (n + m-1) th coil current data; wherein m is more than or equal to 3 and less than or equal to 6. In this embodiment, m is 3, that is, the first data segment to be filtered includes first coil current data, second coil current data, and third coil current data; the second data segment to be screened comprises second coil current data, third coil current data and fourth coil current data; the nth coil current data, the (n + 1) th coil current data and the (n + 2) th coil current data are contained in the data segment to be screened up to the nth. The segmentation mode can ensure higher reliability of subsequent linear fitting.
The second embodiment: the present embodiment also provides a method for detecting a failure of a solenoid valve, and the present embodiment is different from the first embodiment in that step S510 is further added between step S500 and step S600 in the present embodiment. Specifically, as shown in fig. 5, step S510: obtaining the change trend of the slope according to the calculated values of the n slopes, judging whether the change trend of the slope is changed from a positive number to a negative number and then from the negative number to the positive number, and if so, continuing to perform the step S600; if not, the electromagnetic valve is judged to be a qualified piece, and the detection is finished. Through the change trend of the slope, whether the coil conducting current is in a stage of climbing all the way to increase to a stable state after the current appears or a hump stage of decreasing and then increasing in the midway can be judged, and whether the hump peak current exists or not can be judged. Whether the movable iron core can move or not can be judged according to the method, so that the fault condition of the electromagnetic valve can be judged more accurately.
In the case where step S510 is not performed, if the movable core of the solenoid valve to be detected is stuck and cannot move, the detection method according to the first embodiment can determine that the solenoid valve is not a qualified one. This is because when the plunger inside the solenoid valve is stuck, the current curve of the coil is detected according to the detection method provided in the first embodiment as shown in fig. 3, and the average value of the current stabilization data segment is determined as the hump peak current, and although this is a false determination, since the average value of the current stabilization data segment inevitably exceeds the hump peak current, it is also determined as a non-qualified piece and will not be missed. It can be understood that, by using the detection method provided in the second embodiment, different fault types can be determined, and the fault of the solenoid valve can be determined more accurately.
Example three: the present embodiment also provides a method for detecting a failure of an electromagnetic valve, and the difference between the present embodiment and the first or second embodiment is that a detection evaluation index indicating that a hump peak current occurs is further added in the present embodiment. Specifically, as shown in fig. 6, the parameter setting range in step S100 in this embodiment further includes a hump peak occurrence time range; and, step S700 further includes: acquiring corresponding time t when the maximum value Imax of the coil current data appears, and judging whether the time t falls into a hump peak value appearing time range in step S700; if Imax falls into the range of the peak current of the hump and t falls into the range of the time for the peak value of the hump to appear, the electromagnetic valve is judged to be a qualified piece, and the detection is finished; if Imax does not fall into the range of the hump peak current or t does not fall into the range of the hump peak appearing time, the electromagnetic valve is judged to be a non-qualified piece, and the detection is finished.
In the embodiment, the range of the hump peak value occurrence time needs to be obtained through experimental tests, specifically, a qualified coil and a qualified solenoid valve are selected for carrying out experiments to obtain data, and finally, a hump peak value occurrence time reference value corresponding to the hydraulic control assembly to be detected is obtained, which is named as a third reference value Q in the embodiment. The hump peak occurrence time range is set to Q ± 10% in consideration of the error range of data processing. With particular reference to the ESC hydraulic control assembly of this embodiment, the third reference value, Q, is 2.3ms.
As described in the foregoing principle, the coil current value I forms a current curve having a current climbing phase after the coil is energized, and the coil current value I gradually increases immediately after the current climbing phase starts. The electromagnetic induction can drive the movable iron core to move, and when the movable iron core starts to move, the generated counter electromotive force can influence the increase of the coil current value I, which is expressed as the sudden decrease of the coil current value I on a current curve; when the movable iron core moves to the right position, the counter electromotive force disappears, and the current value I of the coil begins to increase again. Therefore, in the process that the movable iron core starts to move to the moving stop, the coil current value I is reduced and then increased, and the coil current value I is represented on a current curve as a hump. Accordingly, the maximum value occurring in the process of decreasing and increasing the coil current value I is the hump peak current in the embodiment. Therefore, the time of the hump peak current is related to the reaction speed of the movable iron core, namely the earlier the movable iron core moves after the coil is electrified, the earlier the hump peak current appears; the later the plunger moves, the later the time at which the hump peak current occurs. The braking effect can be influenced by the early or late movement of the movable iron core, and the braking requirement can not be met. Therefore, in the embodiment, by increasing the evaluation index of the hump peak value occurrence time, whether the electromagnetic valve has a fault can be more accurately judged, and only when Imax falls in the hump peak value current range and t falls in the hump peak value occurrence time range, the electromagnetic valve is judged to be a qualified piece. Therefore, the fault of the solenoid valve during the moving reaction of the movable iron core in the solenoid valve can be detected, and the fault of the solenoid valve can be judged more accurately.
Example four: the present embodiment provides a solenoid valve failure detection system, which is used to implement the solenoid valve failure detection method provided in the above embodiments. Specifically, as shown in fig. 7, the detection system includes a control unit 3, a current data acquisition unit 4, a CAN communication module 5, and a low-pass filtering module 6, and the current data acquisition unit 4, the CAN communication module 5, and the low-pass filtering module 6 are all in signal connection with the control unit 3; the control unit 3 sends an on-off instruction to the ESC through the CAN communication module 5, and the ESC powers on or powers off the coil according to the on-off instruction; the control unit 3 obtains current data of the coil after the coil is electrified through the current data acquisition unit 4, and the control unit 3 performs low-pass filtering processing on the current data through the low-pass filtering module 6 to obtain coil current data.
Further, the current data acquisition unit 4 includes a current sensor 40, a sampling circuit 41 and a data acquisition card 42 which are connected in sequence by signals, the data acquisition card 42 is connected with the control unit 3 by signals, the sampling circuit 41 acquires a current signal of the coil through the current sensor 40, and the data acquisition card 42 converts the current signal into a digital signal and sends the digital signal to the control unit 3.
When the control device is used, after the ESC is assembled, the control unit 3 sends a power-on and power-off command to the ESC through the CAN communication module 5, and the ESC is powered on a coil for 200ms and then powered off according to the command. During the period of 200ms of power supply, the current data of the coil can be acquired by the current data acquisition unit 4 and sent to the control unit 3. The control unit 3 performs low-pass filtering processing on the current data through the low-pass filtering module 6 to obtain coil current data, and then the control unit 3 processes and determines the coil current data according to the set detection program according to the detection method in the above embodiment. The detection system can be used for realizing automatic detection of the faults of the electromagnetic valve.
In the present invention, unless otherwise explicitly stated or limited by the relevant description or limitation, the terms "mounted," "connected," and "fixed" in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through an intermediate medium, or they may be interconnected or in mutual relationship. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific implementation situations.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A fault detection method for an electromagnetic valve is used for detecting the electromagnetic valve in a hydraulic control assembly after assembly is finished, wherein a coil is arranged in the hydraulic control assembly, and the electromagnetic valve extends into the coil;
the method is characterized by comprising the following steps:
s100: generating a parameter setting range for detection according to the hydraulic control assembly, wherein the parameter setting range comprises a coil conduction current range and a hump peak current range;
s200: electrifying the coil according to a set time, acquiring current data after the coil is electrified, and performing low-pass filtering processing on the current data to obtain coil current data;
s300: the coil current data form a current data section, and a current climbing data section and a current stabilization data section are identified and intercepted from the current data section;
s400: calculating the average value of the current stabilization data segment, judging whether the average value falls into the range of the coil conducting current, if so, judging that the coil is a qualified piece, and continuing to perform the step S500; if not, judging that the coil is an unqualified coil, finishing the detection, and performing the step S100 again after replacing the coil;
s500: dividing the current climbing data segment into n data segments to be screened, linearly fitting the n data segments to be screened, and calculating the slope and the fitting degree of each data segment to be screened;
s600: taking the data segment to be screened with the fitting degree larger than a first set threshold value as a data segment to be analyzed, screening out a slope corresponding to the data segment to be analyzed as a slope to be analyzed, comparing the screened slope to be analyzed with 0 to obtain a slope to be analyzed closest to 0, and taking the data segment to be analyzed corresponding to the slope to be analyzed closest to 0 as a selected data segment;
s700: screening out the maximum value Imax of coil current data from the coil current data contained in the selected data section, judging whether the Imax falls into the range of hump peak current, if so, judging that the electromagnetic valve is a qualified piece, and ending the detection; if not, judging that the electromagnetic valve is an unqualified piece, and ending the detection;
the coil conduction current range is a first reference value R +/-8%, and the hump peak current range is a second reference value P +/-10%.
2. A solenoid valve fault detection method as claimed in claim 1, characterized in that said prescribed time is a selected value between 100ms and 300ms and said first set threshold is a selected value between 0.85 and 0.99.
3. The method for detecting failure of solenoid valve according to claim 1, characterized in that between step S500 and step S600 further comprises:
s510: obtaining the change trend of the slope according to the calculated values of the n slopes, judging whether the change trend of the slope is changed from a positive number to a negative number, and then from the negative number to the positive number, and if so, continuing to perform the step S600; if not, the electromagnetic valve is judged to be a qualified piece, and the detection is finished.
4. The electromagnetic valve fault detection method according to claim 1 or 3, characterized in that the parameter setting range in the step S100 further includes a hump peak value occurrence time range; and the number of the first and second groups,
the step S700 further includes: acquiring time t corresponding to the occurrence of the maximum value Imax of the coil current data, and judging whether the time t falls into a hump peak value occurrence time range in the step S700;
if Imax falls into the range of the peak current of the hump and t falls into the range of the time for the peak value of the hump to appear, judging that the electromagnetic valve is a qualified piece, and finishing the detection; and if Imax does not fall into the range of the peak current of the hump or t does not fall into the range of the time for the peak value of the hump to appear, judging that the electromagnetic valve is an unqualified piece, and finishing the detection.
5. The solenoid valve fault detection method of claim 4, characterized in that the hump peak occurrence time range is a third reference value Q ± 10%.
6. The method for detecting a solenoid valve fault according to claim 1, wherein in step S300, the coil current data I greater than the second reference value × C in the current data segment is segmented, the maximum value and the minimum value of the current data I in each segment are compared, and if the difference between the two values is smaller than a second set threshold, the corresponding current data segment is determined as a current stabilization data segment; and judging the current data segment between the generation of the coil current data and the occurrence of the current stabilization data segment as a current climbing data segment.
7. The solenoid valve fault detection method of claim 6, wherein said second set threshold is a selected value between 0.005mA and 0.01 mA.
8. The method for detecting solenoid valve fault according to claim 1, wherein in step S500, each data segment to be screened has m coil current data, and the nth data segment to be screened includes the nth coil current data, the (n + m-1) th coil current data and the coil current data therebetween;
wherein m is more than or equal to 3 and less than or equal to 6.
9. A solenoid valve fault detection system for implementing the solenoid valve fault detection method according to any one of claims 1 to 8, characterized in that the detection system comprises a control unit (3), a current data acquisition unit (4), a CAN communication module (5) and a low-pass filtering module (6), and the current data acquisition unit (4), the CAN communication module (5) and the low-pass filtering module (6) are in signal connection with the control unit (3);
the control unit (3) sends a power-on/power-off command to a hydraulic control assembly through the CAN communication module (5), and the hydraulic control assembly is used for powering on or powering off the coil according to the power-on/power-off command;
the control unit (3) acquires current data of the coil after the coil is electrified through the current data acquisition unit (4), and the control unit (3) performs low-pass filtering processing on the current data through the low-pass filtering module (6) to obtain coil current data.
10. The solenoid valve fault detection system according to claim 9, characterized in that the current data acquisition unit (4) comprises a current sensor (40), a sampling circuit (41) and a data acquisition card (42) which are sequentially connected by signals, the data acquisition card (42) is connected by signals with the control unit (3), the sampling circuit (41) acquires the current signal of the coil through the current sensor (40), and the data acquisition card (42) converts the current signal into a digital signal and sends the digital signal to the control unit (3).
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