CN112628047A - High-pressure common rail system test bed oil injection flow measuring system and calibration method - Google Patents
High-pressure common rail system test bed oil injection flow measuring system and calibration method Download PDFInfo
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- CN112628047A CN112628047A CN202011467933.3A CN202011467933A CN112628047A CN 112628047 A CN112628047 A CN 112628047A CN 202011467933 A CN202011467933 A CN 202011467933A CN 112628047 A CN112628047 A CN 112628047A
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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
- F02M65/001—Measuring fuel delivery of a fuel injector
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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
- 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
- F02M65/003—Measuring variation of fuel pressure in high pressure line
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides an oil injection flow measuring system and a calibration and verification method of a high-pressure common rail system test bed, which comprise the following steps: the device comprises an electronic control oil injector adapter device, a pressure measuring module, an oil cooling module, a fuel metering module and an oil return module; the electronic control fuel injector adaptive device is connected with the pressure measuring module; the pressure measurement module is used for carrying out pressure test on the flow of the fuel oil flowing out of the electronic control fuel injector adapter device; cooling the fuel flow passing through the pressure measurement module through an oil liquid cooling module, and cooling the current fuel to a preset temperature; the cooled oil injection is subjected to fuel oil injection flow measurement or fuel oil mass weight measurement of an oil injector through a fuel oil metering module; the fuel oil after the fuel oil injection flow is measured flows to the oil return module; and the fuel oil after the fuel oil mass weight measurement of the fuel oil injector flows to the weight measurement module.
Description
Technical Field
The invention relates to the field of internal combustion engines, in particular to a high-pressure common rail system test bed flow measurement system and a calibration and verification method, and more particularly relates to a high-power diesel engine high-pressure common rail fuel injection system test bed, and a flow calibration and verification method of a large-scale high-pressure common rail fuel system performance and reliability test bed injection flow measurement system.
Background
In the field of high-power diesel engines, a high-pressure common rail fuel injection system is deeply approved by mainstream markets due to unique advancement, which is mainly characterized in that the high-pressure common rail fuel injection system is different from a traditional mechanical fuel system, and an intelligent system capable of controlling the pressure of fuel liquid in real time and realizing closed loop is formed by a high-pressure oil pump, a pressure sensor, a split common rail and an electronic management system. The high-pressure common rail fuel system has the functions which cannot be achieved by the traditional fuel system, and the common rail pressure is adjusted in real time to control the injection pressure output of the diesel engine, independently control the fuel injection process, control the conversion of the fuel injection rate to achieve the purposes of pre-injection and multiple injection, optimize the performance of the diesel engine and the like. The large-scale high-pressure common rail fuel system formed on the basis integrates two common rails and the multi-cylinder electronic control fuel injectors, can more accurately and efficiently realize multi-cylinder fuel injection rule and fuel injection consistency test verification, and has extremely important breakthrough significance in the field of common rails.
At present, in the technical field of high-pressure common rail system test research, a single-row test bed is generally adopted for test verification, calibration of a test bed flow measurement system is limited to a single-row direct measurement layer, and currently, research on calibration and verification of the flow measurement system of a full-system high-pressure common rail system platform is rarely carried out. Meanwhile, in the flow calibration direction of a general hydraulic system, a flow coefficient calibration method for high hydraulic systems at different test temperatures and different fuel flow intervals is lacked. The invention aims to provide an accurate calibration method for a full-system oil injection flow measurement system of a large-scale high-pressure common rail system comprehensive test bench.
The invention designs a calibration and verification method for the test bed oil injection flow measurement system based on the working characteristics of the high-pressure common rail system comprehensive test. The method has the advantages that the construction of the test bed fuel injection flow measurement system and the establishment of the calibration verification method are completed by analyzing the working mode of the comprehensive test bed of the high-pressure common rail system of the high-power diesel engine, and the verification of the method is carried out in the test work, so that the possible technical risks of a fuel system are effectively reduced in the processes of development and development of an electric control high-pressure common rail system and test of a diesel engine prototype, and the efficiency is further improved.
Patent document CN111765026A (application number: 202010585283.6) discloses a test device and a test method for detecting the oil injection law of a high-pressure common rail system, which includes a driving motor, a common rail pump driven by the driving motor, an oil rail connected to the output end of the common rail pump, an electric control oil injector, an oil injector controller for controlling the electric control oil injector, and a single injection measuring instrument; the method is characterized in that: and a connecting device used for fixing the electric control oil injector and supplying fuel oil in the oil rail to the electric control oil injector is also arranged between the oil rail and the single injection measuring instrument. According to the invention, the oil injector loader is matched with the electric control oil injector through the combined action of the fixing component and the pressing part, the electric control oil injector is fixed, the stability of the electric control oil injector in the test process is ensured, and the loosening phenomenon is prevented.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an oil injection flow measuring system and a calibration and verification method for a high-pressure common rail system test bed.
According to the invention, the invention provides a high-pressure common rail system test bed oil injection flow measuring system, which comprises: the device comprises an electronic control oil injector adapter device, a pressure measuring module, an oil cooling module, a fuel metering module and an oil return module;
the electronic control fuel injector adaptive device is connected with the pressure measuring module; the pressure measurement module is used for carrying out pressure test on the flow of the fuel oil flowing out of the electronic control fuel injector adapter device; cooling the fuel flow passing through the pressure measurement module through an oil liquid cooling module, and cooling the current fuel to a preset temperature; the cooled oil injection is subjected to fuel oil injection flow measurement or fuel oil mass weight measurement of an oil injector through a fuel oil metering module; and the fuel oil after the fuel oil injection flow is metered flows to the oil return module.
Preferably, the fuel injector adapting device comprises an electrically controlled fuel injector and an adapter; the electronic control fuel injector is connected with the adapter; the adapter is connected with the test bed.
Preferably, the pressure measurement module comprises an demister, a pressure sensor and an orifice;
the pressure sensor is communicated with the volume cavity of the mist eliminator, so that the pressure change in the mist eliminator can be measured and monitored in real time, and the closed-loop control of oil pressure is realized; the throttling hole is fixed inside the fog eliminator through the adapter and is located at an oil outlet of the fog eliminator.
Preferably, the oil cooling module comprises a cooler and a fuel filter;
the fuel injection flow after passing through the pressure measurement module is cooled through the cooler block and then filtered through the fuel filter, so that the cleanliness of fuel is ensured.
Preferably, the fuel metering module comprises a flow meter, a two-position three-way valve, a test bed pulse signal, an EFS calibration controller, a plastic cup and a precise electronic scale;
the flow meter measures the flow of the fuel oil cooled by the oil liquid cooling module;
the test bed pulse signal controls the two-position three-way valve through the EFS calibration controller, and controls the fuel oil to flow to the oil return module or the plastic cup through the two-position three-way valve; the fuel flowing to the plastic cup is measured for weight by a precision electronic scale.
Preferably, the system also comprises a temperature sensor, and the temperature sensor is used for measuring and monitoring the passing fuel oil to realize closed-loop control of the oil temperature.
Preferably, the oil return module is connected with a two-position three-way valve and receives fuel oil entering through normal circulation and fuel oil remaining in a pipeline.
According to the calibration and verification method for the oil injection flow measuring system of the high-pressure common rail system test bed, the oil injection flow measuring system of the high-pressure common rail system test bed is used for executing the following steps:
step M1: presetting different working condition points, measuring the volume flow of the fuel flow measuring system for multiple times based on the different working condition points and converting the volume flow into Q40FMeasuring the weight of the oil mass of the oil sprayer;
step M2: measuring the oil mass to obtain the volume value of oil injection at the current temperature and converting the volume value into Q40M；
Step M3: based on Q40F＝kQ40M+ b, taking the average value of multiple measurements of preset different working condition points to correct k and b;
step M4: repeatedly executing the step M1 to obtain the corresponding fuel injection flow measurement Q40FAnd the oil injection volume value Q40MCalculating each measured value Q of the preset working condition point40F、Q40MIndicating value errors are judged, and whether the indicating value errors are within a preset range is judged; when the indicating value error is within the preset range, ending the calibration; and when the indicating error is not in the preset range, repeating the steps M1 to M4 until the indicating error is in the preset range.
Preferably, the different operating points are divided into a plurality of operating points according to different flow areas.
Preferably, the indicating error in the step M4 includes:
where i denotes the ith measurement point.
Compared with the prior art, the invention has the following beneficial effects:
1. based on the working characteristics of the high-pressure common rail system comprehensive test, the design of a calibration and verification method is carried out on the test bed oil injection flow measurement system;
2. according to the invention, by analyzing the working mode of the comprehensive test bed of the high-pressure common rail system of the high-power diesel engine, the establishment of the test bed fuel injection flow measurement system and the establishment of the calibration verification method are completed, and the verification of the method is carried out in the test work, so that the technical risk possibly occurring in a fuel system is effectively reduced in the processes of development of an electric control high-pressure common rail system and test of a diesel engine prototype, and the efficiency is further improved;
3. the calibration method can solve the problem of flow measurement system calibration of the comprehensive test bed of the large-scale high-pressure common rail system, the temperature compensation is considered during the calibration of the flow measurement system, and calibration correction coefficients of each operation area divided according to actual test working conditions can be given;
4. the calibration accuracy and the calibration error of the flow measurement system of the high-pressure common rail system test bed can be provided;
5. the invention can provide the measurement repeatability deviation of each test point of the high-pressure common rail system test bed flow measurement system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a high pressure common rail system test bed flow measurement system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The measuring system sends pulse signals to a lower computer cabinet through an upper computer, signals are input and started through time sequence signal conversion, a main shaft motor of the test bed drives a high-pressure oil pump to work and supply fuel oil to two common rails, the fuel oil is further distributed to each electric control oil injector, the fuel oil is filtered and cooled after injection is achieved, fuel oil flow metering is completed, and finally the fuel oil flows to an oil return tank.
The flow measurement system calibration is used for calibrating and repeatedly verifying the accuracy and the stability of multiple measurements of the flow measurement value.
At standard operating temperature, the relationship between the single flow metering value and the weighing value of the flow measuring system is Q40M＝k·Q40F+ b, the correction coefficients k, b are continuously measured 3 times through each operating point, and Q is respectively solved40F、Q40MAnd substituting the average value into the relational expression to obtain the final product. The correction coefficients k and b of the single fuel injector are calculated by dividing into preset intervals, and the calibration of each fuel injector is independently carried out. And each calibration coefficient is written in by software and hardware of the lower computer (programming realization) in sequence, so that the correction of the acquired readings of each flowmeter is realized, and the readings are fed back to an interface of the upper computer. At this time, the correctness of the above correction coefficient needs to be further checked. The method is to repeat the steps to obtain a new flow value Q40F(corrected), weighing value Q40MThe deviation between the two is obtained. If the current time is within the range, the calibration and verification are passed; otherwise, recalibrating.
Example 1
According to the invention, as shown in fig. 1, the oil injection flow measuring system of the high-pressure common rail system test bed comprises: the device comprises an electronic control oil injector adapter device, a pressure measuring module, an oil cooling module, a fuel metering module and an oil return module;
the electronic control fuel injector adaptive device is connected with the pressure measuring module; the pressure measurement module is used for carrying out pressure test on the flow of the fuel oil flowing out of the electronic control fuel injector adapter device; cooling the fuel flow passing through the pressure measurement module through an oil liquid cooling module, and cooling the current fuel to a preset temperature; the cooled oil injection is subjected to fuel oil injection flow measurement or fuel oil mass weight measurement of an oil injector through a fuel oil metering module; and the fuel oil after the fuel oil injection flow is metered flows to the oil return module.
The pressure measurement is to measure the fuel pressure value at the moment, determine that the test bed is not overpressurized, cannot cause fuel overflow or other faults, and only serves as a security function.
Specifically, the fuel injector adapting device comprises an electric control fuel injector and an adapter; the electronic control fuel injector is connected with the adapter; the adapter is connected with the test bed.
Specifically, the pressure measurement module comprises an demister, a pressure sensor and a throttling hole;
the pressure sensor is communicated with the volume cavity of the mist eliminator, so that the pressure change in the mist eliminator can be measured and monitored in real time, and the closed-loop control of oil pressure is realized; the throttling hole is fixed in the mist eliminator through the adapter and is positioned at the oil outlet of the mist eliminator;
specifically, the oil cooling module comprises a cooler and a fuel filter;
the fuel injection flow after passing through the pressure measurement module is cooled through the cooler block and then filtered through the fuel filter, so that the cleanliness of fuel is ensured.
Specifically, the fuel metering module comprises a flow meter, a two-position three-way valve, a test bed pulse signal, an EFS calibration controller, a plastic cup and a precise electronic scale;
the flow meter measures the flow of the fuel oil cooled by the oil liquid cooling module;
the test bed pulse signal controls the two-position three-way valve through the EFS calibration controller, and controls fuel oil to flow to the oil return module or the weight measurement module through the two-position three-way valve.
The closed-loop control system comprises a temperature sensor, wherein the temperature sensor is used for measuring and monitoring passing fuel oil, so that closed-loop control of the oil temperature is realized.
Specifically, the oil return module is connected with a two-position three-way valve and receives fuel oil entering through normal circulation and fuel oil remaining in a pipeline.
According to the calibration and verification method of the high-pressure common rail system test bed oil injection flow measurement system, the high-pressure common rail system test bed oil injection flow measurement system is used for executing the following steps:
step M1: presetting different working condition points and carrying out fuel flow for multiple times based on different working condition pointsThe volume flow measured by the measuring system is converted into Q40FMeasuring the weight of the oil mass of the oil sprayer;
step M2: measuring the oil mass to obtain the volume value of oil injection at the current temperature and converting the volume value into Q40M；
Step M3: based on Q40F＝kQ40M+ b, taking the average value of multiple measurements of preset different working condition points to correct k and b;
step M4: repeatedly executing the step M1 to obtain the corresponding fuel injection flow measurement Q40FAnd the oil injection volume value Q40MCalculating each measured value Q of the preset working condition point40F、Q40MIndicating value errors are judged, and whether the indicating value errors are within a preset range is judged; when the indicating value error is within the preset range, ending the calibration; and when the indicating error is not in the preset range, repeating the steps M1 to M4 until the indicating error is in the preset range.
Specifically, the different operating condition points are divided into a plurality of operating condition points according to different flow areas, so as to realize the operation task of the test bed in different fuel injection quantity intervals.
Specifically, the indicating error in step M4 includes:
where i denotes the ith measurement point.
Example 2
Example 2 is a modification of example 1
The invention aims to provide a calibration and verification method for a flow metering system of an electronic control high-pressure common rail system test bench. The calibration object is an oil injection flow measuring system of a comprehensive test bed of a certain large-scale high-pressure common rail system, the flow measuring system comprises a flow sensor, measuring software, measuring hardware and the like, and the flow calibration is carried out by adopting a precision weighing meter and the test bed calibration system.
The invention relates to a flow measurement system and a calibration and verification method of a high-pressure common rail system test bed, which are realized by the following technical scheme: a fuel injection flow measuring system of a high-pressure common rail system comprehensive test bed comprises an electric control fuel injector adapter device, a pressure measuring module, a fuel cooling module, a fuel metering module and a fuel return module.
1) The fuel injector adapter device comprises the electric control fuel injector and the adapter thereof, and the fuel injector body is fully fixed, meanwhile, the tightness of the oil liquid flowing through the sealing end of the fuel injector is ensured, and the measuring process is more accurate and effective.
2) The pressure measurement module mainly comprises a spraying and fog dispersing device, a pressure sensor, a throttling hole and an adapter:
the spraying and fog-dispersing device mainly comprises a fog disperser, a fastening bolt and a sealing gasket. The demister is connected with the output end of the electric control oil injector through a fastening bolt, and a sealing surface is formed by a sealing gasket, so that the oil liquid tightness of the sealing end surface is ensured. The mist eliminator is essentially a pressure vessel with fixed volume and internally processed by process reinforcement, and can be adapted to transfer and collect oil under different pressures and oil injection flow rates so as to reduce oil pressure fluctuation and interference caused by high-pressure injection;
the pressure sensor is a high-frequency response pressure sensor, is communicated with the volume cavity of the mist eliminator, and can measure and monitor the pressure change in the mist eliminator in real time to realize the closed-loop control of oil pressure;
the orifice is positioned at an oil outlet at the upper end of the mist eliminator, and the aperture size of the orifice is an optimal practical value obtained by continuously adapting according to the fuel injection quantity and the rail pressure measured value under different test working conditions.
3) The oil liquid cooling module mainly comprises a cooler, a fuel oil filter and a temperature sensor:
the oil liquid cooling module provides cooling oil liquid for the test bed, mainly comprises a water inlet pipe, a cooler, a water return pipe and corresponding pipelines, circulating water is conveyed in through the special cooler for cooling, cooled chilled water enters the test bed plate through a pipe system for replacement, cooling of fuel oil and lubricating oil is achieved, and therefore the normal temperature of the test bed is maintained;
the fuel filter can precisely filter the fuel flowing through the system pipe system, so that the cleanliness of the fuel is ensured;
the temperature sensor is a high-precision temperature sensor, and is arranged on a pipeline to realize temperature measurement and monitoring and realize closed-loop control of oil temperature.
4) The fuel metering module consists of a pulse signal unit, a calibration controller, a two-position three-way valve, a flow sensor and a precise weighing meter:
the pulse signal unit provides current and voltage signals required in a test development process and a certain metering period, and is connected with the test bed through a power supply and a software system to ensure the stable input of electric signals of the test bed.
The calibration controller is developed based on PLC and Labview software and is composed of an industrial personal computer, a software interface and an electric circuit control. Data acquisition and control are carried out through a PLC (programmable logic controller), an industrial personal computer carries out data processing and monitoring, and Labview software is programmed to realize the control of an upper computer, so that the functions of controlling, starting, measuring and the like of the whole test bed flow metering system are realized;
two three-way valves can realize the different circulation directions of fuel in the oil circuit, and the concrete expression does: in the measuring process of the fuel injection flowmeter, a valve connected to an oil way terminal is opened, and the total mass of fuel oil flowing through a pipeline can be accurately acquired; or in the normal oil return process, a valve connected to the oil return tank is opened, and the fuel oil flows to the oil return tank;
the flow sensor is high-precision, the flow measurement range is 2-2000 ml/min, the accuracy reaches 0.3%, the repeatability precision reaches +/-0.05%, the fuel flow passing through the flow sensor can be monitored in real time, and the fuel flow is fed back to a software interface of the fuel quantity measurement system;
the precision weighing meter has the weighing range of 0-4000 g, the accuracy of 0.01g and the resolution of 0.001g, and can accurately weigh the total mass of fuel oil flowing through the piping system;
5) the oil return module consists of an oil return box, a plastic hose and a quick connector:
the oil return tank is used for receiving fuel oil which enters in a normal circulation mode and remains in a pipeline;
the plastic hose and the quick connector can ensure that the oil way of the oil quantity measuring system is effectively connected.
The specific method for calibrating and checking the flow measurement system of the test bed comprises the following steps:
1) fuel injection flow measurement
a. Before testing, leveling a precision weighing meter, peeling and resetting a weighing plastic cup, and debugging a testing working condition point;
b. after setting each metering period time, starting measurement according to parameters of each working condition point, recording original volume flow Q measured by an oil injection flow measurement system in measurement software, and converting the measured temperature of the oil into theoretical volume flow Q' (actual temperature, density rho and rho at 40 ℃) at 40 DEG C40The difference value of the pump oil density table can be obtained by checking and correcting, and is obtained by conversion according to the mass conservation principle,
)；
c. at the beginning of the metering period, the test bed control software starts weighing and metering, the test bed sends a pulse signal to the EFS calibration controller, the EFS calibration controller drives the two-position three-way valve, and fuel flows to the plastic cup; after timing is finished, the test bed sends a pulse signal to the EFS calibration controller, so that the EFS calibration controller drives the two-position three-way valve to return fuel oil to the oil tank, after timing is finished, the plastic cup continuously collects residual fuel oil of the two-position three-way valve pipeline, after laying aside, the mass of the residual fuel oil is weighed by the precision weighing meter, and the mass is recorded as mass M;
d. repeating the measurement for 3 times at each working condition point to finish the measurement of all the working condition points of the flow sensor;
e. and switching the fuel injection pipeline of the electric control fuel injector to a cooler at the front end of the calibrated flow sensor, and repeating the measuring steps until all the working condition point measurements of all the flow sensors are completed.
2) Calculating a correction factor
In order to improve the calibration and correction precision, the flow area is divided into 3 areas according to different Q' values: q' is more than 0 and less than 200 mL/min; q' is less than 800mL/min and is less than or equal to 200 mL/min; q' is less than 1500mL/min and is more than or equal to 800mL/min, and k and b correction coefficients are respectively calculated according to the areas:
a. calculating the utilization from the mass MVolume flow Q obtained by weighing and measuring of precision weighing meter40M(wherein,
Cfis a buoyancy correction factor);
b. according to the volume flow Q measured by the calibrated and corrected oil injection flow measuring system40FAnd the volume flow Q obtained by weighing40MTaking the average value of 3 times of measured data at each test working condition point, and calculating the correction coefficients of k and b by linear regression, wherein Q40F＝kQ'+b；
c. Q respectively demarcated by region40F、Q40MAverage value, linear regression calculation to obtain 3 correction coefficients k and b
3) Writing correction coefficients
Writing the calculated k and b calibration correction coefficients of each partition of the flow sensor of each channel into k and b correction coefficient areas of measurement software, and storing and confirming;
4) calibration method
a. Q measured by a flowmeter40FMeasuring M by a precision weighing meter, and calculating Q according to a formula40M；
b. Calculating each measured value Q of each working condition point in the 3 flow intervals40F、Q40MThe indication error therebetween;
wherein the indication error
i represents the ith measurement point;
c. and sequentially calculating the indicating value error of each flow interval of each flow sensor, and taking the maximum positive value and the minimum negative value of the indicating value error of each flow interval of each channel as the accuracy index of the channel, wherein the accuracy of each channel is required to meet the maximum allowable error requirement of the fuel injection flow measurement system.
5) Checking measurement repeatability
(E) according to each point calculated in the above 4) bm)iThe repeatability of each point of each partition is calculated (E)r)iEach partition is taken [ (E)r)i]maxRepeatability of the partition ErAnd the repeatability of each partition of each channel is in accordance with the preset repeatability requirement of the oil injection flow measurement system.
Wherein the content of the first and second substances,
(Er)irepeatability,%, of measurement at the ith point of the oil injection flow measurement system;
dnthe range coefficient, the number of times of measurement at the same point in the method is 3, and the range coefficient value is 1.69.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a high pressure is rail system test bench oil spout flow measurement system altogether which characterized in that includes: the device comprises an electronic control oil injector adapter device, a pressure measuring module, an oil cooling module, a fuel metering module and an oil return module;
the electronic control fuel injector adaptive device is connected with the pressure measuring module; the pressure measurement module is used for carrying out pressure test on the flow of the fuel oil flowing out of the electronic control fuel injector adapter device; cooling the fuel flow passing through the pressure measurement module through an oil liquid cooling module, and cooling the current fuel to a preset temperature; the cooled oil injection is subjected to fuel oil injection flow measurement or fuel oil mass weight measurement of an oil injector through a fuel oil metering module; and the fuel oil after the fuel oil injection flow is metered flows to the oil return module.
2. The high pressure common rail system test stand fuel injection flow measurement system of claim 1, wherein the injector adapter device comprises an electronically controlled injector and an adapter; the electronic control fuel injector is connected with the adapter; the adapter is connected with the test bed.
3. The high pressure common rail system test stand oil injection flow measurement system of claim 1, wherein the pressure measurement module comprises an demister, a pressure sensor, and a throttle orifice;
the pressure sensor is communicated with the volume cavity of the mist eliminator, so that the pressure change in the mist eliminator can be measured and monitored in real time, and the closed-loop control of oil pressure is realized; the throttling hole is fixed inside the fog eliminator through the adapter and is located at an oil outlet of the fog eliminator.
4. The high pressure common rail system test stand fuel injection flow measurement system of claim 1, wherein the oil cooling module comprises a cooler and a fuel filter;
the fuel injection flow after passing through the pressure measurement module is cooled through the cooler block and then filtered through the fuel filter, so that the cleanliness of fuel is ensured.
5. The high pressure common rail system test bed fuel injection flow measuring system of claim 1, wherein the fuel metering module comprises a flow meter, a two-position three-way valve, a test bed pulse signal, an EFS calibration controller, a plastic cup and a precision electronic scale;
the flow meter measures the flow of the fuel oil cooled by the oil liquid cooling module;
the test bed pulse signal controls the two-position three-way valve through the EFS calibration controller, and controls the fuel oil to flow to the oil return module or the plastic cup through the two-position three-way valve; the fuel flowing to the plastic cup is measured for weight by a precision electronic scale.
6. The fuel injection flow measuring system of the high-pressure common rail system test bed of claim 1, further comprising a temperature sensor, wherein the temperature sensor measures and monitors fuel oil passing through, and closed-loop control of the oil temperature is realized.
7. The fuel injection flow measuring system of the high-pressure common rail system test bed of claim 1, wherein the oil return module is connected with a two-position three-way valve and receives fuel entering through normal circulation and fuel remaining in a pipeline.
8. A calibration and verification method for an oil injection flow measurement system of a high-pressure common rail system test bed is characterized in that the oil injection flow measurement system of the high-pressure common rail system test bed disclosed by any one of claims 1 to 7 is used for executing the following steps:
step M1: presetting different working condition points, and repeatedly carrying out the operation based on the different working condition pointsMeasuring the volume flow of a fuel flow measurement system and converting it into Q40FMeasuring the weight of the oil mass of the oil sprayer;
step M2: measuring the oil mass to obtain the volume value of oil injection at the current temperature and converting the volume value into Q40M；
Step M3: based on Q40F＝kQ40M+ b, taking the average value of multiple measurements of preset different working condition points to correct k and b;
step M4: repeatedly executing the step M1 to obtain the corresponding fuel injection flow measurement Q40FAnd the oil injection volume value Q40MCalculating each measured value Q of the preset working condition point40F、Q40MIndicating value errors are judged, and whether the indicating value errors are within a preset range is judged; when the indicating value error is within the preset range, ending the calibration; and when the indicating error is not in the preset range, repeating the steps M1 to M4 until the indicating error is in the preset range.
9. The calibration and verification method for the oil injection flow measurement system of the high-pressure common rail system test bed according to claim 1, wherein the different working condition points are divided into a plurality of working condition points according to different flow areas.
10. The method for calibrating and verifying the oil injection flow measurement system of the high-pressure common rail system test bed according to claim 1, wherein the step M4 of indicating the error comprises the following steps:
where i denotes the ith measurement point.
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