CN117627834A - Method and device for testing fuel injector - Google Patents
Method and device for testing fuel injector Download PDFInfo
- Publication number
- CN117627834A CN117627834A CN202210997793.3A CN202210997793A CN117627834A CN 117627834 A CN117627834 A CN 117627834A CN 202210997793 A CN202210997793 A CN 202210997793A CN 117627834 A CN117627834 A CN 117627834A
- Authority
- CN
- China
- Prior art keywords
- point
- injection quantity
- fuel injection
- test
- overpressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 204
- 238000012360 testing method Methods 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title description 13
- 238000002347 injection Methods 0.000 claims abstract description 232
- 239000007924 injection Substances 0.000 claims abstract description 232
- 238000010998 test method Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 18
- 230000000875 corresponding effect Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- 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
- F02M65/001—Measuring fuel delivery of a fuel injector
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
A test scheme for a fuel injector having a fuel injection amount adjusting function includes: determining a corresponding reference working condition point for the overpressure working condition point, wherein the oil injection pressure of the reference working condition point is equal to or lower than the upper limit of the test pressure, the nominal oil injection quantity is the same as that of the overpressure working condition point, and the reference working condition point and the overpressure working condition point meet the predetermined oil injection quantity correlation condition; measuring the oil injection quantity of the reference working point by using the oil injector test equipment according to the oil injection pressure corresponding to the reference working point; comparing the measured oil injection quantity of the reference working point with the nominal oil injection quantity of the reference working point to obtain the oil injection quantity deviation of the reference working point; and correcting the obtained oil injection quantity deviation of the reference working point to obtain the oil injection quantity deviation of the overvoltage working point.
Description
Technical Field
The present application relates to a test method and apparatus for a fuel injector having a fuel injection amount adjusting function.
Background
Engine systems are typically equipped with a plurality of injectors to inject fuel into the engine. In the early stage of engine development, the nominal injection quantity-power-on time Map (distribution Map) of the used injector under each injection pressure needs to be measured, and meanwhile, a test sheet is recorded according to a typical working condition test point of the engine. When the fuel injectors selected by the engine are produced in batches, the test equipment of the fuel injector production line measures the actual fuel injection quantity for each fuel injector according to each test point on a test sheet, and for the fuel injector with IQA (injection quantity adjusting) function, the deviation delta Q between the measured fuel injection quantity and the nominal fuel injection quantity can be generated to be IQA code imprinted on each fuel injector. When the oil sprayer is installed on the engine, the deviation information of the test points corresponding to each oil sprayer is transmitted into the ECU through IQA code scanning. When the engine works normally, the ECU determines the power-on time required by each fuel injector based on the deviation information of each fuel injector so as to control the fuel injector to spray.
In the case of mass production of fuel injectors, it may happen that the injection pressure of the test points on the test sheet is higher than the upper measurement limit of the production line test equipment. The reasons may be: the local production of the inlet oil sprayer, namely the production place and production line change; and the productivity of the production line is released, and old equipment is reused.
In this case, in order to ensure IQA function of the injector, it may be necessary to upgrade the test equipment of the injector production line to meet the test pressure requirement, which may cause a huge investment. Or, the customer is required to define new fuel injector test points according to the upper limit of the fuel injector production line test equipment, readjust calibration and brush the ECU. Meanwhile, because the oil injectors before and after adjustment are matched with the ECU for use, the oil injector before adjustment can only be used together with the ECU which is not re-written, and the oil injector after adjustment can only be used together with the ECU which is re-written, so that non-matched mixing is forbidden. Once intermixing occurs, engine performance is affected.
Disclosure of Invention
The purpose of the application is to provide an improved intelligent testing scheme for a fuel injector with a fuel injection quantity adjusting function, which can utilize testing equipment of a fuel injector production line to test series fuel injectors with testing pressure exceeding the upper testing pressure limit of the testing equipment, and does not need to upgrade the testing equipment or recalibrate and re-write an ECU.
In order to achieve the object, in one aspect, the present application provides a fuel injector testing scheme for measuring fuel injection quantity deviation of a fuel injector having a fuel injection quantity adjusting function at a plurality of test operating points, at least one operating point of the plurality of test operating points being an overpressure operating point at which a test pressure is higher than a test pressure upper limit, and the remaining operating points being non-overpressure operating points at which the test pressure is equal to or lower than the test pressure upper limit, the fuel injector testing method including:
determining a corresponding reference working condition point for the overpressure working condition point, wherein the oil injection pressure of the reference working condition point is equal to or lower than the upper limit of the test pressure, the nominal oil injection quantity is the same as that of the overpressure working condition point, and the reference working condition point and the overpressure working condition point meet the predetermined oil injection quantity correlation condition;
measuring the oil injection quantity of the reference working point by the oil injection pressure corresponding to the reference working point;
comparing the measured fuel injection quantity of the reference working point with the nominal fuel injection quantity of the reference working point to obtain the fuel injection quantity deviation of the reference working point;
and correcting the obtained oil injection quantity deviation of the reference working point to obtain the oil injection quantity deviation of the overvoltage working point.
According to the test scheme for the fuel injector with the fuel injection quantity adjusting function, the series of fuel injectors with the required test pressure exceeding the upper limit of the test pressure of the test equipment can be tested by utilizing the available test pressure of the test equipment of the fuel injector production line, and the fuel injection quantity deviation value obtained by testing under the available test pressure is corrected to obtain the fuel injection quantity deviation value under the required test pressure, so that the IQA code is generated. The test equipment is not required to be upgraded, and the equipment upgrading cost can be saved. In addition, the ECU can directly read the IQA code generated in the way, and the problems of recalibration and re-writing of the ECU and unmatched mixed use of the fuel injector and the ECU are avoided.
Drawings
The application may be further understood by reading the following detailed description with reference to the drawings in which:
FIG. 1 is a logic block diagram of a test scenario for a fuel injector having fuel injection quantity adjustment functionality of the present application;
FIG. 2 is a flow chart of one embodiment of a test scenario for a fuel injector with fuel injection amount adjustment function of the present application;
fig. 3 and 4 are graphs of fuel injector test results using the prior art and the present technology, respectively.
Detailed Description
The present application relates generally to a test scheme for an oil injector having an IQA (injection quantity adjusting) function for testing an injection quantity of each oil injector. The fuel injectors tested using the techniques of this application are best applied to common rail fuel injection systems, but may be used with other forms of fuel injection systems.
In the engine development and manufacturing process, the following three phases are associated with implementing IQA functions.
The first stage: in the early stages of engine development, the nominal injection quantity-power-on time Map (distribution Map) of the used injectors at each injection pressure needs to be measured by using a test device. This injection quantity-energization time Map is stored in the ECU software in the form of a system pressure-injection quantity-energization time table. And meanwhile, defining a test point according to the typical working condition of the engine, and recording the oil injection pressure, the adding time and the nominal oil injection quantity of the test point into a test sheet.
And a second stage: when the fuel injectors selected by the engine are produced in batches, on test equipment of an actual production line of the fuel injectors, actual fuel injection quantity is measured for each fuel injector according to fuel injection pressure and power-on time of each test point on a test sheet, and IQA code is generated by deviation delta Q between the measured fuel injection quantity and nominal fuel injection quantity and is marked on each fuel injector.
And a third stage: when the type oil sprayer is installed on an engine, deviation information corresponding to each oil sprayer is transmitted into an internal IQA software module of the ECU through IQA code scanning. When the engine works normally, the ECU calculates the required nominal oil injection quantity, corrects the nominal oil injection quantity into the required oil injection quantity corresponding to each oil injector by using the IQA module based on the deviation information of the test points corresponding to each oil injector as a reference, and obtains the required power-on time of each oil injector by checking the oil injection quantity-power-on time Map corresponding to the required oil injection quantity of each oil injector. The ECU controls the fuel injectors to spray according to the power-on time required by each fuel injector.
In the second stage, typical operating points are generally selected, and the fuel injection quantity of each fuel injector at each typical operating point is determined by using test equipment of a fuel injector production line, namely the actual fuel injection quantity of the fuel injector at the corresponding fuel injection pressure and power-up time of each typical operating point.
With the continued advancement of technology for fuel injectors and fuel injection systems, the test pressures for certain defined operating conditions of the fuel injector may exceed the upper test pressure limits of the original test equipment of the fuel injector production line. For this situation, the present application proposes a novel testing technique that can realize the testing of the fuel injection quantity of the fuel injector under the working condition exceeding the upper limit of the testing pressure of the testing equipment without upgrading the original testing equipment of the fuel injector production line, as described below.
First, as an example, the present application selects the following typical operating points to test the injector:
full power full load operating point; idle speed working condition points; an exhaust operating point; a first (low pressure) pre-spray operating point; second (high pressure) pre-spray operating point.
These selected typical operating points are extremely representative and can characterize typical fuel injection quantities of a fuel injector at various fuel injection pressures. Of these typical operating points, the full power full load operating point has the highest injection pressure and the idle operating point has the lowest injection pressure.
The meaning of the above-described typical operating points is well known in the art (although the names may differ), and will not be explained here.
Of course, the present application also covers the case of selecting other operating points to determine the fuel injection quantity of the fuel injector.
For each injector, the application determines a deviation value of the fuel injection quantity of the injector relative to a nominal fuel injection quantity for the above or other operating points.
Specifically, for the operating point meeting the test condition, that is, the operating point where the injection pressure is equal to or lower than the upper limit of the test pressure of the test device, the test device of the fuel injector production line is used to measure the injection quantity of the operating point of each fuel injector meeting the test condition (the test pressure is equal to the injection pressure), and the measured injection quantity of the operating point is compared with the nominal injection quantity of the operating point in the test sheet to obtain the injection quantity deviation.
For a working point which does not meet the test condition (may be called an overpressure working point), that is, a working point where the injection pressure is higher than the upper limit of the test pressure of the test device, a reference working point may be set for measurement. The test pressure of the reference working point is equal to or lower than the upper limit of the test pressure of the test equipment, and the oil injection quantity of the reference working point and the oil injection quantity of the overpressure working point meet the oil injection quantity correlation condition. The nominal fuel injection quantity for the reference operating point is recorded in the test sheet. After the fuel injection quantity of the reference working point is measured by using the test equipment, comparing the fuel injection quantity of the reference working point with the nominal fuel injection quantity of the reference working point to obtain the fuel injection quantity deviation of the reference working point, and correcting the fuel injection quantity deviation of the reference working point to obtain the fuel injection quantity deviation of the overpressure working point. Thus, for an overpressure operating point, its test pressure may be lower than its injection pressure. The deviation of the injection quantity of the overpressure operating point thus obtained is actually a result of the calculation of the correlation formula and no longer an actual measurement result. Certain errors necessarily exist between the theoretical calculation result and the actual measurement result, and the errors can cause the difference and the dispersion difference of each cylinder of the engine to be large. To ensure that the engine cylinder-to-cylinder variation remains as constant as possible, the following means may be employed in order to be able to meet the actual operating requirements:
1. the correlation between the fuel injection quantity deviation of the selected reference working point and the fuel injection quantity deviation of the overvoltage working point is improved as much as possible, so that the error is reduced.
2. And considering the influence of the decrease of the IQA effect caused by the error into the setting range of the delivery tolerance of the oil injector, and ensuring that the difference of each cylinder of the engine after the IQA correction is kept unchanged by tightening the delivery tolerance of the oil injector.
The reference working condition point is determined by obtaining the corresponding oil injection quantity of a plurality of types of oil injectors at two working condition points (an overpressure working condition point and a reference working condition point) in a research and development test table or simulation software meeting all test pressures in advance. And (5) carrying out oil injection quantity dispersion differential layout on the results in a group of two pairs. Can obtain the correlation coefficient R of two working points 2 And a two-working-point correlation regression equation. Correlation coefficient R 2 If the reference operating point is larger than the preset value, determining that the two operating points meet the oil injection quantity correlation condition, and judging that the reference operating point can be used for estimating the injection of the overpressure operating pointThe oil mass and regression equation is used as a calculation formula for calculating the oil mass of the overpressure working point by the oil mass of the reference working point.
The determination of the fuel injection amount correlation condition is specifically described below.
Assuming that the first injection pressure is P1 (e.g., 1800 bar) and the second injection pressure is P2 (e.g., 2000 bar), a nominal injection quantity Q (e.g., 80 mg) is set. For this injection quantity Q, the nominal injection time is T1 at the first injection pressure P1 and the nominal injection time is T2 at the second injection pressure P2. Then the first operating point is (P1, T1) and the second operating point is (P2, T2). Measuring actual fuel injection quantity Q1 and Q2 of each fuel injector at the two working condition points by adopting a plurality of fuel injectors, counting deviation delta Q1 and delta Q2 between the actual fuel injection quantity Q1 and Q2 of each fuel injector at the two working condition points and nominal fuel injection quantity Q, and analyzing statistical correlation coefficient R of the fuel injection quantity deviation delta Q1 and delta Q2 between the two working condition points 2 . If the correlation coefficient R 2 If the deviation is larger than a preset value, for example, 0.8, the oil injection quantity deviations delta Q1 and delta Q2 are considered to be statistically strongly correlated, and further, the two working condition points are judged to meet the oil injection quantity correlation condition.
Next, assume that the test pressure at the selected certain test operating point is equal to or lower than the upper test pressure limit P of the test equipment max (e.g., 1800 bar), the actual fuel injection quantity of the fuel injector at the test operating point can be directly measured by using the test equipment, and the measured actual fuel injection quantity at the test operating point is compared with the nominal fuel injection quantity in the test sheet to obtain the fuel injection quantity deviation of the test operating point.
On the other hand, assume that the test pressure at a selected certain test operating point (e.g. 2000 bar) is higher than the upper test pressure limit P of the test device max (e.g., 1800 bar), the test operating point is an overpressure operating point, and the actual fuel injection quantity of the overpressure operating point cannot be directly measured by the test equipment. In this case, a reference operating point at the first injection pressure P1 can be determined, which satisfies the fuel injection quantity dependency condition with the overpressure operating point. The actual fuel injection quantity of the reference working point can be measured by using the test equipment, and the measured actual fuel injection quantity of the reference working point is compared with the referenceAnd (3) comparing the nominal fuel injection quantity (from the test sheet) of the working point to obtain the fuel injection quantity deviation of the reference working point, and correcting the fuel injection quantity deviation of the reference working point to obtain the fuel injection quantity deviation of the second working point.
Therefore, even if the upper limit of the test pressure of the test equipment of the oil sprayer production line cannot meet the test pressure requirements of all working condition points, the oil injection quantity test of all the working condition points can be determined, and therefore the oil injection quantity deviation can be determined for all the working condition points.
It should be noted that for the determination of the dependence of the injection quantity, the injection pressure selected as the reference operating point is preferably equal to (or only slightly below) the upper test pressure limit P of the test device max 。
For injection pressures above the upper test pressure limit P of the test device max For the purpose of at or below the upper limit P of the test pressure of the test equipment max The reference working condition points meeting the oil injection quantity correlation condition can be determined by software simulation by using a large number of oil injectors with the same type, and can also be measured by using a test device with enough test capability (namely, the upper limit of the test pressure is higher than the second oil injection pressure P2).
The control logic of the test apparatus of the present application is schematically shown in fig. 1.
As shown in FIG. 1, when a fuel injector is tested, for a certain test operating point, if its injection pressure P is equal to or lower than the upper test pressure limit P of the test device max If the operating point is called a non-overpressure operating point, the fuel injection quantity Q of the fuel injector at the operating point is measured by using the testing equipment inj Oil quantity Q inj And comparing the nominal fuel injection quantity of the working point with the nominal fuel injection quantity of the working point in the test sheet to obtain the fuel injection quantity deviation delta Q of the working point.
For a certain test operating point (especially a full-power full-load operating point), if the injection pressure P is higher than the upper test pressure limit P of the test equipment max The operating point is an overpressure operating point, and the test equipment is used for measuring that the fuel injection pressure of the fuel injector is equal to or lower than the upper limit P of the test pressure of the test equipment max Reference to (2)Oil injection quantity Q of working point inj Oil quantity Q inj Comparing the nominal fuel injection quantity from the reference working point in the test sheet to obtain the fuel injection quantity deviation delta Q of the reference working point 0 . Then the fuel injection quantity deviation delta Q of the reference working point 0 And correcting to obtain the oil injection quantity deviation delta Q of the overvoltage working point.
After the fuel injection quantity deviation deltaq is determined for all operating points of one fuel injector, a fuel injection quantity adjusting code IQAC is generated. The injection quantity adjustment code IQAC is typically marked on the injector, such as the injector tip, so as to be easily readable. During engine operation, the ECU reads the fuel injection amount adjustment code IQAC for each fuel injector for current system pressure adjustment of the power-up time of each fuel injector, thereby controlling the fuel injection amount of each fuel injector.
It should be noted that for a certain injection pressure, one operating point may be selected for measurement, or multiple operating points may be selected for measurement (each operating point is for a different power-up time, but the injection pressure is the same).
It should be noted that the injection pressure at the reference operating point may generally be set to the upper test pressure limit so that the measurement of the overpressure operating point is as accurate as possible.
Regarding the injection quantity deviation Δq of the overpressure operating point and the injection quantity deviation Δq of the reference operating point 0 The relation between the two operating points can be expressed as a regression equation obtained when the two operating points are determined to meet the oil injection quantity correlation condition:
ΔQ＝ΔQ 0 *S
where S is a correction factor, determined based on data of a number of actual products.
It should be noted that there may be situations where it is desirable to measure more than one overpressure operating point where the injection pressure is above the upper test pressure limit. In this case, the fuel injection quantity deviation Δq can be determined for each overpressure operating point in each case by means of the above-described evaluation method.
If a plurality of overpressure operating points are measured at the second injection pressure P2, the correction factors S that they are suitable for may differ due to the different power-up times of the overpressure operating points.
The present application also relates to a test method for a fuel injector having a fuel injection quantity regulating function, which can be implemented by means of the test device described above. An exemplary flow of the test method of the present application is shown in fig. 2.
As shown in fig. 2, in step S1, the test device is started to test a certain fuel injector, and a plurality of test operating points of the fuel injector are determined, where the plurality of test operating points includes at least one overpressure operating point where the fuel injection pressure is higher than the upper test pressure limit of the test device.
Next, in step S2, one of the plurality of test operating points is selected.
Next, in step S3, it is determined whether the injection pressure at the operating point is higher than the upper limit of the test pressure of the test device. If the judgment result is negative, judging that the working point is not an overvoltage working point, and turning to step S4; if yes, the working point is judged to be an overvoltage working point, and the process goes to step S6.
S4, measuring the oil injection quantity of the oil injector at the working condition point by using test equipment;
next, in step S5, the fuel injection quantity measured in step S4 is compared with the nominal fuel injection quantity of the operating point in the pre-stored test sheet to obtain the fuel injection quantity deviation of the operating point. After step S5, the process goes to step S9.
In step S6, a corresponding reference operating point is determined for the overpressure operating point, the injection pressure of the reference operating point is equal to or lower than the upper limit of the test pressure of the test device, the nominal injection quantity is the same as the overpressure operating point, and the reference operating point and the overpressure operating point satisfy the injection quantity correlation condition; and measuring the oil injection quantity of the oil injector at the reference working condition point by using test equipment. If the reference working condition point meeting the oil injection quantity correlation condition is not met, the test program is exited, and the test is not completed.
After the fuel injection quantity of the fuel injector is measured at the reference working point, in step S7, the measured fuel injection quantity at the reference working point is compared with the nominal fuel injection quantity at the reference working point in the pre-stored test sheet to obtain the fuel injection quantity deviation at the reference working point.
Next, in step S8, the deviation of the fuel injection quantity of the reference operating point obtained in step S7 is corrected, and the deviation of the fuel injection quantity of the overpressure operating point is obtained. After step S8, the process goes to step S9.
In step S9, it is determined whether the measurement has been completed at all the operating points. If the judgment result is negative, the program goes to step S2; if the determination is yes, the process goes to step S10.
In step S10, an IQA code is generated based on the fuel injection amount deviation of all the operating points.
Various adaptations of the test apparatus and test methods described herein may be made by those skilled in the art under the principles of the present application.
The present application also relates to a machine-readable storage medium storing executable instructions that, when executed, cause a processor to perform the above-described test method.
To verify the effectiveness of the test technique of the present application, the applicant conducted a verification test in which in a common rail diesel engine system, a plurality of injectors were tested using conventional test techniques, wherein the fuel injection quantity deviation was measured by the test apparatus at the actual injection pressure for each test operating point. Then, an IQA code is generated based on the fuel injection amount deviation of each operating point, and the ECU reads the IQA code. Then, the engine characteristics when the ECU controls the engine operation are measured. The measured engine speed-torque characteristic is shown in fig. 3.
In addition, a plurality of fuel injectors are tested by using the test technology, wherein the fuel injection quantity deviation is measured by test equipment according to actual fuel injection pressures of an idle operating point, an exhaust operating point, a first pre-injection operating point and a second pre-injection operating point, the fuel injection quantity deviation of a reference operating point of a full-power full-load operating point (rated supply pressure 2000 bar) is measured according to the fuel injection pressure of 1800 bar, and the fuel injection quantity deviation of the reference operating point is corrected to obtain the fuel injection quantity deviation of the full-power full-load operating point. Then, an IQA code is generated based on the fuel injection amount deviation of each operating point, and the ECU reads the IQA code. Then, the engine characteristics when the ECU controls the engine operation are measured. The measured engine speed-torque characteristic is shown in fig. 4.
Comparing the data in fig. 4 and 3, it can be seen that the difference between the engine operating characteristics achieved using the deviation of the fuel injection amount at each operating point and the thus generated IQA code determined by the test technique according to the present application and the engine operating characteristics achieved using the completely measured technique determined by the deviation of the fuel injection amount at each operating point and the thus generated IQA code is extremely small, and that the corrected engine output torque at any operating point is achieved within +/-3% of the torque target value defined at the time of development. This verification results in that the test technique of the present application is capable of providing extremely high test accuracy.
According to the test scheme for the fuel injector with the fuel injection quantity adjusting function, the series of fuel injectors with required test pressure exceeding the upper limit of the test pressure of the test equipment can be tested by using the available test pressure of the test equipment, and the fuel injection quantity deviation value obtained by testing under the available test pressure is corrected to obtain the fuel injection quantity deviation value under the required test pressure, so that the IQA code is generated. The test equipment is not required to be upgraded, and the equipment upgrading cost can be saved. In addition, the ECU can directly read the IQA code generated in the way, and recalibration and re-writing of the ECU are not needed, so that the problem of unmatched mixed use of the fuel injector and the ECU can be avoided.
Although the present application is described herein with reference to specific embodiments, the scope of the application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the present application.
Claims (10)
1. A fuel injector testing method for measuring fuel injection quantity deviation of a fuel injector with fuel injection quantity adjusting function at a plurality of test operating points, at least one operating point of the plurality of test operating points being an overpressure operating point with a test pressure higher than a test pressure upper limit, and the remaining operating points being non-overpressure operating points with test pressures equal to or lower than the test pressure upper limit, the fuel injector testing method comprising:
determining a corresponding reference working condition point for the overpressure working condition point, wherein the oil injection pressure of the reference working condition point is equal to or lower than the upper limit of the test pressure, the nominal oil injection quantity is the same as that of the overpressure working condition point, and the reference working condition point and the overpressure working condition point meet the predetermined oil injection quantity correlation condition;
measuring the oil injection quantity of the reference working point by the oil injection pressure corresponding to the reference working point;
comparing the measured fuel injection quantity of the reference working point with the nominal fuel injection quantity of the reference working point to obtain the fuel injection quantity deviation of the reference working point;
and correcting the obtained oil injection quantity deviation of the reference working point to obtain the oil injection quantity deviation of the overvoltage working point.
2. The fuel injector testing method according to claim 1, wherein the fuel injection amount correlation condition is predetermined in the following manner: measuring actual fuel injection quantity at the reference operating point and the overpressure operating point for a plurality of fuel injectors, and if the deviation of the actual fuel injection quantity measured at the reference operating point and the overpressure operating point relative to the same nominal fuel injection quantity has statistical correlation R 2 If the reference operating point is larger than a preset value, determining that the reference operating point and the overpressure operating point meet the fuel injection quantity correlation condition; the predetermined value is, for example, 0.8.
3. The fuel injector testing method according to claim 1 or 2, wherein the fuel injection pressure at the reference operating point is set to the upper test pressure limit.
4. A fuel injector testing method as in any of claims 1-3, wherein the nominal fuel injection amount for the reference operating point is taken from a pre-stored test chart.
5. The fuel injector testing method of any of claims 1-4, wherein the over-pressure operating point comprises at least a full power full load operating point.
6. The fuel injector testing method according to any one of claims 1 to 5, wherein the fuel injection quantity deviation of the reference operating point is corrected to obtain the fuel injection quantity deviation of the overpressure operating point by using a regression equation obtained when it is determined that the reference operating point and the overpressure operating point satisfy the fuel injection quantity correlation condition;
specifically, the fuel injection quantity deviation of the reference operating point is multiplied by a correction coefficient to obtain the fuel injection quantity deviation of the overpressure operating point.
7. The fuel injector testing method of any of claims 1-6, wherein, for each non-overpressure operating point, the fuel injection quantity for the non-overpressure operating point is measured with the fuel injection pressure for the non-overpressure operating point;
and comparing the measured oil injection quantity of the non-overpressure working point with the nominal oil injection quantity of the non-overpressure working point to obtain the oil injection quantity deviation of the non-overpressure working point.
8. The fuel injector testing method of any of claims 1-7, wherein the IQA code is generated based on fuel injection quantity deviations of all test operating points.
9. The fuel injector testing equipment is used for measuring fuel injection quantity deviation of a fuel injector with a fuel injection quantity adjusting function at a plurality of testing working condition points, the fuel injector testing equipment is provided with a testing pressure upper limit, at least one working condition point in the plurality of testing working condition points is an overpressure working condition point with testing pressure higher than the testing pressure upper limit, and other working condition points are non-overpressure working condition points with testing pressure equal to or lower than the testing pressure upper limit;
the fuel injector testing apparatus is configured to:
determining a corresponding reference working condition point for the overpressure working condition point, wherein the oil injection pressure of the reference working condition point is equal to or lower than the upper limit of the test pressure, the nominal oil injection quantity is the same as that of the overpressure working condition point, and the reference working condition point and the overpressure working condition point meet the predetermined oil injection quantity correlation condition;
measuring the oil injection quantity of the reference working condition point by utilizing the oil injector testing equipment according to the oil injection pressure corresponding to the reference working condition point;
comparing the measured fuel injection quantity of the reference working point with the nominal fuel injection quantity of the reference working point to obtain the fuel injection quantity deviation of the reference working point;
correcting the oil injection quantity deviation of the obtained reference working point to obtain the oil injection quantity deviation of the overvoltage working point;
optionally, the test apparatus comprises the features of the injector test method of any of claims 1-8.
10. A machine readable storage medium storing executable instructions that when executed by a processor implement the injector testing method of any of claims 1-8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997793.3A CN117627834A (en) | 2022-08-19 | 2022-08-19 | Method and device for testing fuel injector |
| DE102023206876.1A DE102023206876A1 (en) | 2022-08-19 | 2023-07-20 | Fuel injector testing method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997793.3A CN117627834A (en) | 2022-08-19 | 2022-08-19 | Method and device for testing fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117627834A true CN117627834A (en) | 2024-03-01 |
Family
ID=89808952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210997793.3A Pending CN117627834A (en) | 2022-08-19 | 2022-08-19 | Method and device for testing fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117627834A (en) |
| DE (1) | DE102023206876A1 (en) |
-
2022
- 2022-08-19 CN CN202210997793.3A patent/CN117627834A/en active Pending
-
2023
- 2023-07-20 DE DE102023206876.1A patent/DE102023206876A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023206876A1 (en) | 2024-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8333109B2 (en) | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine | |
| US6904354B2 (en) | System and methods for correcting the injection behavior of at least one injector | |
| US8347863B2 (en) | Method for controlling a fuel delivery device on an internal combustion engine | |
| US20180106208A1 (en) | Method and device for ascertaining a correction value for a fuel injection quantity | |
| US7392789B2 (en) | Method for synchronizing cylinders in terms of quantities of fuel injected in an internal combustion engine | |
| US10598116B2 (en) | Method for ascertaining a correction value for fuel metering of a fuel injector | |
| SE531292C2 (en) | Method for adjusting an opening timing model or lookup table and a system for controlling an injector of a cylinder in an internal combustion engine | |
| US8430082B2 (en) | Determining the quality of fuel in an auto-igniting internal combustion engine | |
| KR102406014B1 (en) | Method for Correcting Deviation of Static Flow Rate in GDI Injector and System Thereof | |
| CN112228234A (en) | Transient fuel control method and system of gas engine for power generation | |
| KR20100023916A (en) | Method and device for determining a control parameter for a fuel injector of an internal combustion engine | |
| US8275536B2 (en) | Method for the determination of an injected fuel mass of a preinjection | |
| KR101090794B1 (en) | Method and device for dosing fuel which is to be injected into combustion chamber of internal combustion engine | |
| US8775058B2 (en) | Method for the injector-individual adaption of the injection time of motor vehicles | |
| US8515602B2 (en) | Method and device for checking the function of an engine system | |
| CN102454504A (en) | Deterioration determination apparatus for airflow meter and deterioration determination method | |
| CN117627834A (en) | Method and device for testing fuel injector | |
| CN105074183A (en) | Method for operating a common rail system of a motor vehicle having a redundant rail pressure sensor | |
| US8756985B2 (en) | Method for checking a functionality of a rail pressure sensor | |
| GB2378773A (en) | A method and apparatus for controlling the pressure in a high pressure fuel store | |
| US7543566B2 (en) | Method and control unit for operating an internal combustion engine having an injection system | |
| US5806487A (en) | Fuel injection pump unit with control and process for its calibration | |
| KR20190006746A (en) | Method of learning closing time of injector | |
| KR20170067330A (en) | Method of learning closing time of injector | |
| CN110594068A (en) | Method, device and equipment for detecting fuel injection quantity and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |