CN108361138B - Diagnosis and detection method and device for high-pressure common-rail pipe flow limiting valve - Google Patents
Diagnosis and detection method and device for high-pressure common-rail pipe flow limiting valve Download PDFInfo
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- CN108361138B CN108361138B CN201810081932.1A CN201810081932A CN108361138B CN 108361138 B CN108361138 B CN 108361138B CN 201810081932 A CN201810081932 A CN 201810081932A CN 108361138 B CN108361138 B CN 108361138B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a diagnosis and detection method and a device for a high-pressure common rail pipe flow limiting valve, which consists of an electric control high-pressure common rail fuel injection system, a temperature measurement module, a flow control and measurement module and an electronic control system, wherein an exhaust oil collector is arranged on a flow measurement pipeline of the flow limiting valve, the system regularly measures the flow of an electric control oil injector of the diagnosis and detection device for calibration and compensation, and the performance of the flow limiting valve is comprehensively judged by measuring the temperature rise slope of the flow limiting valve during working and the closing flow characteristic of the flow limiting valve. The method is used for detecting the performance of the common rail pipe flow limiting valve, and judging faults such as leakage or inflexible movement in the flow limiting valve by utilizing the temperature rise slope, can analyze the fault type of the flow limiting valve more comprehensively, and ensures the accuracy and reliability of performance detection of the flow limiting valve.
Description
Technical Field
The invention relates to a method and a device for diagnosing and detecting a flow limiting valve, in particular to a method and a device for diagnosing and detecting a flow limiting valve of a high-pressure common rail pipe.
Background
The application of the electronic control high-pressure common rail fuel injection system to the engine is a great technical progress, and the performance and the exhaust emission level of the engine can be directly and effectively improved. As a safety-related power mechanical component, the design and manufacture of the electronic control high-pressure common rail fuel injection system need to consider safety countermeasures of various special conditions so as to ensure the safety and reliability of products.
The electronic control high-pressure common rail fuel injection system forms basically constant pressure through the pressure storage function of the high-pressure common rail pipe and distributes the pressure to an engine combustion chamber through the electronic control fuel injector, in order to prevent the electronic control fuel injector from being stuck and the like, the high-pressure fuel directly enters an engine cylinder in an uncontrolled state, the high-pressure common rail pipe is provided with a flow limiting valve, when the electronic control fuel injector is in fault and is directly communicated, the flow exceeds the normal working range of the flow limiting valve, the flow limiting valve acts to cut off the high-pressure fuel, and therefore the safety protection effect is achieved.
The flow limiting valve is used as an important safety part of the high-pressure common rail pipe, and strict performance detection must be carried out in the production and manufacturing process to judge whether the performance of the flow limiting valve meets the requirements or not and ensure that only qualified products can pass through. Usually, the detection of the flow limiting valve is carried out on a special oil pump test bed, and whether the performance of the flow limiting valve meets the requirements or not is analyzed and judged through the measurement of various set parameters, so that whether the performance of the flow limiting valve is qualified or not is judged. In the existing method, generally, an electronic control fuel injector is used for regulating the flow of a pipeline, and the performance of the electronic control fuel injector is analyzed and judged by measuring the closing flow characteristic when a flow limiting valve works, but in practice, because the fuel temperature, the aging of the electronic control fuel injector, the installation mode and the like have great influence on the flow measurement, the characteristic of the flow limiting valve is not comprehensive and accurate only by measuring the closing flow, sometimes even wrong conclusions can be obtained, for example, when the inside of the flow limiting valve is leaked or the movement is inflexible, if the closing flow conforms to the preset range, the performance of the flow limiting valve can obviously not be accurately judged only by the flow, and the correct conclusion can not be obtained; and at low temperature, the viscosity of the fuel is high, the work of the flow limiting valve is unstable, the flow limiting valve is closed due to accidental factors, and the accuracy of performance judgment of the flow limiting valve is influenced by the conditions, so that misjudgment is caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a diagnosis and detection method for a high-pressure common-rail pipe flow-limiting valve.
The invention also provides a diagnosis and detection device for the high-pressure common-rail pipe flow-limiting valve, which is specially used for diagnosis and detection of the high-pressure common-rail pipe flow-limiting valve and ensures that the test process is consistent with the actual working state.
According to the technical scheme provided by the invention, the diagnosis and detection device for the high-pressure common rail pipe flow limiting valve is characterized in that: the fuel tank is connected with the high-pressure common rail pipe through the high-pressure oil pump and the high-pressure oil pipe, the high-pressure common rail pipe is provided with the pressure sensor, a pressure relief opening of the high-pressure common rail pipe is provided with the pressure relief valve and is connected with the fuel tank through the pressure relief valve oil return pipe, a high-pressure oil outlet of the high-pressure common rail pipe is provided with the measured flow limiting valve, the measured flow limiting valve is connected with a flow control and measurement module through an electric control oil injector and a mist eliminator, and the flow control and measurement module is connected with the fuel tank through the system oil return pipe; the control signal of the electric control fuel injector is communicated with an electronic control system in real time, a temperature measuring module is installed on the side face of the measured flow limiting valve, the signal of the temperature measuring module is connected with the electronic control system, the signal of the flow control and measuring module is connected with the electronic control system, and fuel output by the flow control and measuring module enters a fuel tank through a system oil return pipe.
Furthermore, the flow control and measurement module comprises a plurality of flow reversing valves, the flow reversing valves are connected with the flow switching and measurement unit to realize the action control of the flow reversing valves, and the flow switching and measurement unit is connected to the electronic control system; the P port of the flow reversing valve is connected to a flow sensor after passing through an exhaust oil collector, the output end of the flow sensor is connected with a multi-path oil collector, and the multi-path oil collector is connected with a fuel tank through a system oil return pipe; and a T port of the flow reversing valve is connected with a multi-channel oil collector.
Furthermore, the exhaust oil collector is divided into an oil inlet area and an oil outlet area by a middle partition plate, a gap is arranged above the middle partition plate, and liquid in the oil inlet area flows into the oil outlet area through the gap; an oil inlet is arranged at the bottom of the exhaust oil collector and is lower than the liquid level in actual working; an oil outlet is arranged on the exhaust oil collector; and the highest point above the oil inlet area is provided with an exhaust port, and a pressure exhaust valve is arranged on the exhaust port.
Further, a measured flow limiting valve is arranged at each high-pressure oil outlet of the high-pressure common rail pipe.
The diagnosis and detection method for the high-pressure common rail pipe flow limiting valve is characterized by adopting the diagnosis and detection device for detection, and comprises the following steps:
(1) carrying out system temperature control, and finishing temperature control when the temperature of the fuel tank reaches a set value;
(2) after the temperature reaches a set value, testing the flow limiting valve, measuring a change curve of the surface temperature along with time when the flow limiting valve works, judging whether the temperature rise is within a preset range, and performing primary diagnosis and detection on the performance of the flow limiting valve according to the temperature curve;
(3) and measuring the closing flow characteristic of the flow limiting valve, and judging whether the closing flow is in a specified range by combining the temperature rise within the preset time when the flow limiting valve works so as to comprehensively judge the performance of the flow limiting valve.
Further, the detection method further comprises the step of calibrating the electronic control fuel injector: and measuring the flow of the electric control oil injector periodically, and calibrating and compensating the electric control oil injector through the flow.
The invention simulates the actual working state of the flow limiting valve, tests the working process of the flow limiting valve, simultaneously, the system is provided with the temperature sensor, and the performance of the flow limiting valve is comprehensively judged by measuring the temperature rise slope of the flow limiting valve during working and the closing flow characteristic of the flow limiting valve, thereby improving the accuracy of the performance judgment of the flow limiting valve. The flow of the electric control oil injector is calibrated periodically, the electric control oil injector used by the system is calibrated and compensated through flow difference, and the consistency difference of the electric control oil injector is corrected, so that the performance measurement deviation of the flow limiting valve caused by the flow deviation of the electric control oil injector is compensated.
Drawings
Fig. 1 is a schematic structural diagram of a high-pressure common rail pipe flow limiting valve diagnosis and detection device provided by the invention.
Fig. 2 is a schematic diagram of the flow control and measurement module.
Fig. 3 is a schematic view of the exhaust collector.
FIG. 4 is a flow characteristic diagram of an electronically controlled fuel injector.
Fig. 5 is a schematic view of the comprehensive measurement of the temperature of the closed flow of the flow limiting valve.
Fig. 6 is a schematic diagram of the temperature rise curve of the flow limiting valve.
Fig. 7 is a flow chart of a diagnostic test for a constrictor valve.
Description of reference numerals: the device comprises an A-flow control and measurement module, a 1-test bed chassis, a 2-fuel tank, a 3-test bed control computer, a 4-high-pressure oil pump, a 5-electronic control system, a 6-high-pressure oil pipe, a 7-high-pressure common rail pipe, an 8-electronic control fuel injector, a 9-demister, a 10-pressure sensor, a 11-pressure safety valve, a 12-measured flow limiting valve, a 13-temperature measurement module, a 14-pressure safety valve oil return pipe, a 15-system oil return pipe, a 31-flow reversing valve, a 32-flow switching and measurement unit, a 33-exhaust oil collector, a 34-flow sensor, a 35-multipath oil collector, a 40-gap, a 41-middle partition plate, a 42-exhaust port and a 43-pressure exhaust valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the diagnosis and detection device for the high-pressure common rail pipe flow-limiting valve comprises a complete set of electric control high-pressure common rail fuel injection system consisting of a fuel tank 2, a high-pressure oil pump 4, a high-pressure oil pipe 6, a high-pressure common rail pipe 7, a pressure sensor 10, a pressure safety valve 11, a measured flow-limiting valve 12, a pressure safety valve oil return pipe 14, a system oil return pipe 15 and an electronic control system 5, wherein the electric control high-pressure common rail fuel injection system is installed on a test bed chassis 1, the fuel tank 2 is connected with the high-pressure common rail pipe 7 through the high-pressure oil pump 4 and the high-pressure oil pipe 6, the pressure sensor 10 is arranged on the high-pressure common rail pipe 7, a pressure relief port of the high-pressure common rail pipe 7 is provided with the pressure safety valve 11 and is connected with the fuel tank 2 through the pressure safety valve oil return pipe 14, a measured flow-limiting valve 12 is installed at a, the flow control and measurement module A is connected with the fuel tank 2 through a system oil return pipe 15. If the pressure relief valve 11 is decompressed, fuel enters the fuel tank 2 through the pressure relief valve oil return pipe 14, the test bed control computer 3 realizes the control of the whole system, and measured parameters are stored in real time. In order to ensure that the working state of the diagnosis and detection device is consistent with the working state of the actual electronic control high-pressure common rail fuel injection system, a measured flow limiting valve is arranged at each high-pressure oil outlet of the high-pressure common rail pipe 7. The invention is only explained by taking a four-cylinder electric control high-pressure common rail fuel injection system as an example, four tested current-limiting valves 12 are simultaneously installed on a high-pressure common rail pipe 7 of a diagnosis detection device, the fuel pressure in the high-pressure common rail pipe 7 is controlled in a closed loop mode through an electronic control system 5 during testing, a control signal of an electric control fuel injector 8 is communicated with the electronic control system 5 in real time to realize the opening and closing control of the electric control fuel injector 8, a temperature measurement module 13 is installed on the side surface of the tested current-limiting valve 12, the temperature measurement module 13 is realized in an infrared measurement mode, and a signal of the temperature measurement module 13 is connected with the electronic control system 5 to realize the real-time measurement of the surface. The flow control and measurement module A realizes pipeline flow switching and flow measurement, signals of the flow control and measurement module A are connected with the electronic control system 5, and fuel output by the flow control and measurement module A finally enters the fuel tank 2 through the system oil return pipe 15. The temperature measurement module 13 measures the surface temperature of the measured current-limiting valve 12 in real time, comprehensively judges whether the measured current-limiting valve meets the requirements by measuring the temperature rise slope of the measured current-limiting valve 12 in operation and the closing flow characteristic of the measured current-limiting valve, and realizes the diagnosis and detection of the measured current-limiting valve.
As shown in fig. 2, the flow control and measurement module a includes a plurality of flow reversing valves 31, where i, ii, iii, and iv respectively represent corresponding cylinder number positions, the flow reversing valves 31 are used to switch flow directions, the flow switching and measurement unit 31 is used to realize motion control of the flow reversing valves 31 and acquisition of signals of the flow sensors 34, and the flow switching and measurement unit 32 is connected to the electronic control system 5. The fuel oil from the port P of the flow reversing valve passes through the exhaust oil collector 33 and then is connected to the flow sensor 34, so that the flow measurement is realized, the flow output by the flow sensor 34 enters the multipath oil collector 35, and finally enters the fuel tank 2 through the system oil return pipe 15. When the flow is not measured by the flow sensor 34, the flow from the flow reversing valve T directly enters the multipath oil collector 35, and the outlet is connected to the system oil return pipe 15 after the confluence and enters the fuel tank 2.
As shown in fig. 2, the flow reversing valve 31 defaults to the open position, that is, the flow of the measured restriction valve 12 is input through the port a of the flow reversing valve 31 and output to the oil collecting device 35 through the port T, and the flow output by the measured restriction valve 12 is not measured through the flow sensor 34 by default, that is, the flow output by the measured restriction valve 12 is not measured; when the flow measurement of the measured restriction valve 12 is to be performed, taking the position i as an example, the electronic control system 5 sends a control signal, and controls the flow reversing valve in the position i through the flow switching and measuring unit 32, at this time, the flow reversing valve acts to close the T port and connect the P port, at this time, the flow of the restriction valve input from the port a enters the exhaust oil collector 33 through the P port, and then enters the flow sensor 34 to perform the real-time flow measurement, and meanwhile, to improve the accuracy and stability of the flow measurement, the exhaust oil collector 33 has a pipeline exhaust function, and the specific structure is shown in fig. 3.
As shown in fig. 3, the exhaust oil collector 33 is divided into an oil inlet area and an oil outlet area by a middle partition plate 41, a gap 40 is arranged above the middle partition plate 41, and liquid in the oil inlet area flows into the oil outlet area through the gap 40. In fig. 3, E is an oil inlet, and F is an oil outlet, wherein the oil inlet E is at the bottom of the exhaust oil collector 33, and the oil inlet E is lower than the liquid level in actual operation, so as to prevent the oil inlet from mixing with air and introducing gas. The oil outlet F is arranged at the upper part of the exhaust oil collector 33, so that the time for the liquid stored in the oil outlet area to continuously flow out from the oil outlet F to form flow when the oil inlet area does not feed oil can be shortened. The highest point above the oil inlet area is provided with an air outlet 42, the air outlet 42 is provided with a pressure air outlet valve 43, after the fuel oil flows into the oil inlet area through the pressure air outlet valve 43, due to the buoyancy effect of air, the air gradually rises to the highest point of the exhaust oil collector 33, when the pressure reaches a limit value, the pressure air outlet valve 43 is automatically opened, the air is discharged through the air outlet 42, and when the air pressure is lower than the limit value, the pressure air outlet valve 43 is automatically closed, so that the air in the exhaust oil collector 33 is ensured to be discharged in time, the risk of the air mixing into the oil is reduced, and the stability and.
As shown in fig. 4, which is a flow rate characteristic table of the electronic control injector 8, for the electronic control injector which is produced in a batch and has good performance, the relationship among the injection pressure, the driving time and the flow rate is shown in a curve in fig. 4, that is, the longer the driving time is at the same pressure, the larger the flow rate is, and the higher the injection pressure is at the same driving time, the larger the flow rate is.
For an actual electronic control oil injector, because the interior of the electronic control oil injector is a complex electromagnetic mechanism, a complex hydraulic mechanism and a complex mechanical mechanism, the basic performance can be aged and drifted along with the lapse of working time, and in order to ensure the consistency and the stability of flow detection of a flow limiting valve, the performance of the electronic control oil injector serving as a throttling function in a diagnosis detection device is kept consistent. Therefore, in order to ensure the accuracy and reliability of the performance test of the flow limiting valve, the electronic control fuel injectors are periodically calibrated, after the diagnostic detection device is stable, the flow switching and measuring unit 32 shown in fig. 2 is used for respectively testing the flow of each electronic control fuel injector 8 under the conditions of set pressure and driving time, and correction is performed according to the difference of the flow, here, only the injection pressure P1 and the driving time t are taken as examples for analysis, and for the electronic control fuel injector with ideal characteristics, the flow at this time is q, namely shown as a point a in fig. 4; when the electronic control injector is aged, if the pressure P1 is set and the actual test flow at the driving time t is q ', where q ' > q is assumed, i.e., as shown by point a ' in fig. 4, the driving time corresponding to the flow q ' is interpolated on the injection pressure P1 characteristic curve as t ', and as shown by point B in fig. 4, the time difference Δ t between two points A, B is calculated.
Δt＝t'-t (1)；
The time difference Δ t is a calibration compensation value of the electronic control oil injector, and since the actual flow characteristic q' of the electronic control oil injector is higher than the theoretical flow q, the time after Δ t is deducted when the electronic control system 5 drives is taken as the actual driving time, so that the increased flow of the electronic control oil injector is corrected, and the actual flow is ensured to be consistent with the theoretical characteristic. When the actual flow of the electric control fuel injector is smaller than the theoretical characteristic flow, namely q' < q, the method can be analyzed in the same way, and the only difference is that the actual driving time at the moment should be increased by delta t. The method is used for regularly calibrating the electric control oil injector, and updating the calibration compensation value delta t of the corresponding oil injector after calibration test, so that the performance consistency of the electric control oil injector used for the test of the flow limiting valve is ensured, the accuracy of the performance test of the flow limiting valve is ensured, and the difference of the test of the flow limiting valve caused by the flow performance difference of the electric control oil injector is avoided.
FIG. 5 is a schematic diagram illustrating the comprehensive measurement of the temperature of the flow rate at the closing of the flow limiting valve, wherein the diagnostic device meets the test condition through temperature control and is the starting point of the test, i.e. the test time 0 point, and then operates to the time t according to the preset working condition1Simultaneously recording 0 to t in real time1Duration of temperature of the flow limiting valve, let t1The temperature of the time limiting valve is T1Corresponding to the point P, the limiting valve with normal function is between 0 and t1The temperature rise curve in the period is in a specified range, namely the temperature change must accord with a certain rule, the rule is determined after the test and calibration of the flow limiting valve with normal function, and the specific limit value of the temperature rise curve is shown in figure 6; then the diagnosis detection device operates to the time t according to the set working condition2The throttle flow of the electric control oil injector is gradually increased according to the set interval, and the time t is recorded2The temperature of the time limiting valve is T2Corresponding to the point Q, the passing flow of the flow limiting valve is gradually increased, and if the point reaches t3The current limiting valve is closed at the moment, and the temperature of the current limiting valve is T3Corresponding to the point R, the temperature rise slope K is shown as follows:
then at t of the test flow of the flow limiting valve3At the moment, the closing flow q of the flow limiting valve is recordedcloseAs an important detection indicator, i.e. the closing flow qcloseWhether the temperature rise gradient K is within the specified range or not needs to be analyzed, and when the internal leakage or the movement of the flow limiting valve is inflexible, the judgment can be carried out through temperature abnormity, so that the internal leakage or the movement inflexible fault of the flow limiting valve can be judged by utilizing the temperature rise gradient K, and the fault can be judged only through the closing flow q of the flow limiting valvecloseThe analysis of (a) cannot be judged effectively. Therefore, the performance of the flow limiting valve is comprehensively judged by measuring the temperature rise slope of the flow limiting valve during working and the closing flow characteristic of the flow limiting valve, various fault types of the flow limiting valve can be more comprehensively analyzed, and the detection accuracy of the flow limiting valve is ensuredAnd reliability.
Recording the starting time of the closed flow test to the duration of the closing of the flow limiting valve as delta t2As follows:
Δt2＝t3-t2(3)；
if during the test from t2At the beginning of time, after tlmtIf the flow limiting valve is not closed, namely the flow limiting valve is not closed in action when the system reaches the specified flow, the fault of the flow limiting valve is judged, wherein tlmtIs a parameter of the testing time of the flow limiting valve determined by calibration, and the parameter tlmt＞Δt2. Wherein time t1、t2And t3Is a parameter determined by actual condition calibration, temperature T1、T2And T3Obtained by actual measurement.
Fig. 6 is a schematic diagram of a temperature rise curve of a flow limiting valve, in which the abscissa is test time, and the ordinate is a temperature value of the surface of the flow limiting valve, that is, the surface temperature of the flow limiting valve with normal performance rises with the flow passing through the flow limiting valve, if the flow limiting valve does not work due to a certain reason, that is, no flow passes through the flow limiting valve, the temperature basically does not change or rises slowly, and at this time, the temperature value at the corresponding moment is lower than a lower limit value; if some reason is that the temperature rises violently due to internal leakage of the flow limiting valve, the temperature value at the corresponding moment is higher than the upper limit value, therefore, the relationship between the temperature value on the surface of the flow limiting valve at the corresponding moment and the upper limit value and the lower limit value can be used for qualitatively judging whether the performance of the flow limiting valve is basically normal or not, preliminary judgment is carried out for further carrying out comprehensive analysis of the temperature rise slope and the flow closing characteristic of the flow limiting valve, and the upper limit value and the lower limit value of the temperature of the flow limiting valve in the graph 6 are determined through statistical analysis of the flow limiting valve test with.
Fig. 7 shows a diagnostic test procedure for a restriction valve:
step S10: initializing the system, and completing the self-diagnosis function of the system and the sensor;
step S20: inputting test information, namely inputting relevant information of the tested current limiting valve, such as a product model, a serial number, a tester and the like;
step S30: the test bed control computer is communicated, namely the electronic control system is communicated with the test bed control computer, and the input of an operation instruction of the test bed control computer is waited;
step S40: judging whether the test instruction is received correctly or not by receiving the test instruction judgment, and returning to the step S30 to continue waiting if the test instruction is not received; if the test instruction sent by the test bed control computer is correctly received, the step S50 is entered;
step S50: measuring the temperature of the oil tank, namely acquiring the temperature value of the oil tank of the test bed;
step S70: judging whether the temperature of the oil tank meets a set value or not, if so, entering the next step, otherwise, entering a temperature control step S60, namely, cooling when the temperature is high, if not, operating the electronic control high-pressure common rail fuel injection system under a large load to increase the fuel temperature, and then measuring and judging the temperature again until the temperature of the oil tank is within the range of the set value;
step S80: judging whether the electronic control fuel injector needs to be calibrated, wherein the calibration time of the electronic control fuel injector is long, and the calibration rule of the electronic control fuel injector can be set according to the actual situation, such as working specified time or testing specified number of flow limiting valves, and the like, so that the step S80 judges whether the calibration condition of the electronic control fuel injector is met, if the calibration condition is met, the step S85 is carried out to calibrate the flow of the electronic control fuel injector, and the specific calibration process is carried out according to the flow characteristic table of the electronic control fuel injector shown in the figure 4;
step S90: and correcting the flow of the electric control oil injector according to the flow calibration result. If the step S80 judges that the flow calibration of the electric control fuel injector is not needed, the step S100 is carried out to measure the temperature of the flow limiting valve, namely, the temperature measuring module is used for measuring 0-t according to the graph shown in FIG. 51Step S110 is a temperature curve judgment, which is mainly to judge according to the temperature rise curve shown in fig. 6, judge whether the temperature rise is within a preset range, and if not, go to step S130 to output a report and then end the test; if the temperature rises within the specified range, the flow is measured by closing the flow limiting valve in step S120, namely the system runs to the set working conditionTime t2The throttle flow of the electric control oil injector is gradually increased at regular intervals, and if t is reached3And (3) closing the action of the current limiting valve at the moment, calculating a K value according to the formula (2), judging whether the closing flow is in a specified range, generating a corresponding test report including test information data, whether the test is qualified and the like in step S130, finishing the current test of the current limiting valve after the test report is generated, storing a corresponding test result, and waiting for a next test instruction.
The embodiments described above, including the illustrated flow diagrams, are susceptible of numerous modifications and variations within the scope of the present disclosure and covered by the claims, and therefore the described embodiments should not be construed as limiting the scope of the invention as claimed.
Claims (5)
1. A diagnostic detection method for a high-pressure common rail pipe flow limiting valve adopts a diagnostic detection device for the high-pressure common rail pipe flow limiting valve to detect; the high-pressure common rail pipe flow limiting valve diagnosis and detection device comprises an electric control high-pressure common rail fuel injection system consisting of a fuel tank (2), a high-pressure oil pump (4), a high-pressure oil pipe (6), a high-pressure common rail pipe (7), a pressure sensor (10), a pressure safety valve (11), a measured flow limiting valve (12), a pressure safety valve oil return pipe (14), a system oil return pipe (15) and an electronic control system (5), wherein the fuel tank (2) is connected with the high-pressure common rail pipe (7) through the high-pressure oil pump (4) and the high-pressure oil pipe (6), the high-pressure common rail pipe (7) is provided with the pressure sensor (10), a pressure relief opening of the high-pressure common rail pipe (7) is provided with the pressure safety valve (11) and is connected with the fuel tank (2) through the pressure safety valve oil return pipe (14), the high-pressure oil outlet of the high-pressure common rail pipe (7) is provided with the measured flow limiting valve (12), and the measured flow limiting valve The flow control and measurement module (A) is connected with the fuel tank (2) through a system oil return pipe (15); the control signal of the electric control fuel injector (8) is communicated with the electronic control system (5) in real time, a temperature measuring module (13) is installed on the side face of the measured flow limiting valve (12), the signal of the temperature measuring module (13) is connected with the electronic control system (5), the signal of the flow control and measuring module (A) is connected with the electronic control system (5), and fuel output by the flow control and measuring module (A) enters the fuel tank (2) through a system oil return pipe (15);
the method is characterized by comprising the following steps:
1) carrying out system temperature control, and finishing temperature control when the temperature of the fuel tank reaches a set value;
2) after the temperature reaches a set value, testing the flow limiting valve, measuring a change curve of the surface temperature along with time when the flow limiting valve works, judging whether the temperature rise is within a preset range, and performing primary diagnosis and detection on the performance of the flow limiting valve according to the temperature curve;
3) and measuring the closing flow characteristic of the flow limiting valve, and judging whether the closing flow is in a specified range by combining the temperature rise within the preset time when the flow limiting valve works so as to comprehensively judge the performance of the flow limiting valve.
2. The diagnostic detection method for the high-pressure common rail pipe flow limiting valve according to claim 1, which is characterized by comprising the following steps of: the detection method further comprises the step of calibrating the electric control fuel injector: and measuring the flow of the electric control oil injector periodically, and calibrating and compensating the electric control oil injector through the flow.
3. The diagnostic detection method for the high-pressure common rail pipe flow limiting valve according to claim 1, which is characterized by comprising the following steps of:
the flow control and measurement module (A) comprises a plurality of flow reversing valves (31), the flow reversing valves (31) are connected with a flow switching and measurement unit (32) to realize the action control of the flow reversing valves (31), and the flow switching and measurement unit (32) is connected to the electronic control system (5); the P port of the flow reversing valve (31) is connected to a flow sensor (34) after passing through an exhaust oil collector (33), the output end of the flow sensor (34) is connected with a multipath oil collector (35), and the multipath oil collector (35) is connected with a fuel tank (2) through a system oil return pipe (15); and a T port of the flow reversing valve (31) is connected with a multipath oil collector (35).
4. The diagnostic detection method for the high-pressure common rail pipe flow limiting valve according to claim 3, is characterized in that:
the exhaust oil collector (33) is divided into an oil inlet area and an oil outlet area by a middle partition plate (41), a gap (40) is arranged above the middle partition plate (41), and liquid in the oil inlet area flows into the oil outlet area through the gap (40); an oil inlet (E) is arranged at the bottom of the exhaust oil collector (33), and the oil inlet (E) is lower than the liquid level in actual working; an oil outlet (F) is arranged on the exhaust oil collector (33); an exhaust port (42) is arranged at the highest point above the oil inlet area, and a pressure exhaust valve (43) is installed on the exhaust port (42).
5. The diagnostic detection method for the high-pressure common rail pipe flow limiting valve according to claim 1, which is characterized by comprising the following steps of:
and a measured flow limiting valve is arranged at each high-pressure oil outlet of the high-pressure common rail pipe (7).
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| CN109519293B (en) * | 2018-10-29 | 2021-12-28 | 宝鸡吉利发动机有限公司 | Method for controlling fuel injection quantity of fuel system and fuel system |
| RU2746757C1 (en) * | 2019-12-13 | 2021-04-20 | Публичное акционерное общество "ОДК - Уфимское моторостроительное производственное объединение" (ПАО "ОДК-УМПО") | Stand for testing fuel collectors |
| CN111175040B (en) * | 2019-12-31 | 2021-06-11 | 中国船舶重工集团公司第七一一研究所 | Method for testing closed oil quantity of flow limiting valve |
| CN111219279B (en) * | 2020-01-08 | 2021-07-09 | 一汽解放汽车有限公司 | Fuel injection system with self-protection function and pressure control method |
| CN112729850B (en) * | 2020-11-16 | 2023-01-13 | 苏州好易修信息科技有限公司 | High-pressure common rail intelligent test tool |
| CN112628047B (en) * | 2020-12-14 | 2022-09-13 | 中国船舶重工集团公司第七一一研究所 | High-pressure common rail system test bed oil injection flow measuring system and calibration method |
| CN112784507B (en) * | 2021-02-02 | 2024-04-09 | 一汽解放汽车有限公司 | Method for establishing full three-dimensional coupling model for simulating fuel flow in high-pressure common rail pump |
| CN113514250B (en) * | 2021-06-25 | 2022-09-16 | 一汽解放汽车有限公司 | Oil injector diagnosis method and device, computer equipment and storage medium |
| CN115076003B (en) * | 2022-07-12 | 2023-06-30 | 重庆红江机械有限责任公司 | Low-speed machine common rail flow limiting valve test system |
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