CN214741791U - Measuring device for variable-altitude fuel injection strategy of oxygen-containing mixed fuel diesel engine - Google Patents
Measuring device for variable-altitude fuel injection strategy of oxygen-containing mixed fuel diesel engine Download PDFInfo
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- CN214741791U CN214741791U CN202022701716.8U CN202022701716U CN214741791U CN 214741791 U CN214741791 U CN 214741791U CN 202022701716 U CN202022701716 U CN 202022701716U CN 214741791 U CN214741791 U CN 214741791U
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Abstract
The utility model discloses a survey device of oxygen-containing mixed fuel diesel engine variable altitude oil spout tactics. The utility model comprises an eddy current dynamometer, an air intake and exhaust simulation system, an engine control system, a data acquisition system, a cooling water constant temperature control system and a combustion analyzer; the gas pipeline is provided with an air inlet valve, a flowmeter, a pressure stabilizing tank, an engine, an exhaust valve, a vacuum pump and a pressure stabilizing tube in sequence from an air inlet to an air outlet, the engine is connected with an eddy current dynamometer through a connecting shaft, an oil injection tank is connected with the engine through a pipeline provided with an oil consumption meter, a pressure sensor arranged in the engine and an angle mark meter connected with the engine are respectively connected with a combustion analyzer, an air inlet and exhaust simulation system is respectively connected with the air inlet valve and the exhaust valve, an engine control system is connected with the eddy current dynamometer, and a data acquisition system and a cooling water constant temperature control system are respectively connected with the engine.
Description
Technical Field
The utility model relates to a be applied to the oxygen-containing mixed fuel field of plateau, more specifically say, relate to PODE3～5The measuring device of the elevation-variable fuel injection strategy of the diesel oil mixed fuel diesel engine.
Background
The Qinghai-Tibet plateau is the most representative plateau in the world, the average altitude exceeds 4000m, and the total area reaches 240 km2Approximately 1/4, the territorial area of China. The characteristics of climate environment with low atmospheric pressure and low oxygen content in plateau areas lead to the deterioration of diesel engine combustion, the reduction of dynamic property, economy, reliability and durability and the increase of heat load. At present, aiming at the problems of reduced power performance and economy, increased thermal load, black smoke emission, difficult starting and the like when a diesel engine runs in a plateau area, the main research work is carried out and comprises the following steps: plateau pressurization matching, oil supply system adjustment, intake oxygen content improvement and the like. Through comprehensive analysis, the power recovery of the diesel engine can be realized only below 3000m by adopting the plateau matching of a single-stage supercharger and the diesel engine and the oil supply system adjusting technology; by adopting the two-stage adjustable supercharging technology, although the power of the 5000m diesel engine can be recovered to more than 80% of that of the plain, the structure is complex and the volume is large, and the installation on the diesel engine for the vehicle is very difficult; the plateau combustion condition of the diesel engine can be improved by adopting oxygen-enriched air, but the prior membrane oxygen generation technology is not mature and is limited in application. The method is an important means for improving the combustion and performance of the diesel engine at different altitudes under the condition of not changing the structure of the diesel engine, and has important significance for solving the problems of serious reduction of the power performance and the economical efficiency of the diesel engine, increase of the heat load and black smoke caused by incomplete combustion of the fuel under the anoxic condition of the plateau.
Aiming at the combustion thermodynamic state of the diesel engine under the condition of plateau low-pressure environment, the ideal fuel has the characteristics of high cetane number, good atomization performance, oxygen content and the like, and PODE (CH)3O(CH2O)nCH3(n is more than or equal to 1 and less than or equal to 10)), the carbon atoms and the oxygen atoms are alternately connected to form a chain structure, the chain structure has extremely high oxygen content, the PODE and the mixture can be dissolved in diesel oil, and the PODE and the mixture have more excellent physical and chemical properties than the diesel oil, so that the PODE and the mixture are more ideal diesel oil addition components. PODE can be prepared from coal-based raw materials, has good evaporativity, and does not need to be used as engine fuel for a fuel injection systemAnd (5) system modification.
However, the strong intermolecular forces of PODE result in high bulk density, resulting in higher density than diesel; PODE van der Waals forces are stronger such that the melting point is higher than that of diesel oil under the same carbon atom conditions. The PODE pear flower characteristic causes that the PODE/diesel oil mixed fuel diesel engine has different spraying characteristics and combustion characteristics under different working conditions at different altitudes. The atomization quality and the quality of the combustion process of the PODE/diesel mixed fuel diesel engine with different altitudes are influenced by the common injection parameters of the operating condition of the diesel engine and the physicochemical properties of the fuel. There are few studies on this aspect.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a survey device of PODE diesel oil mixed fuel diesel engine variable altitude oil spout tactics is provided.
The utility model discloses PODE3～5The measuring device for the altitude-variable oil injection strategy of the diesel oil mixed fuel diesel engine comprises an eddy current dynamometer, an air intake and exhaust simulation system, an engine control system, a data acquisition system, a cooling water constant temperature control system and a combustion analyzer; the gas pipeline is provided with an air inlet valve, a flowmeter, a pressure stabilizing tank, an engine, an exhaust valve, a vacuum pump and a pressure stabilizing tube in sequence from an air inlet to an air outlet, the engine is connected with an eddy current dynamometer through a connecting shaft, an oil injection tank is connected with the engine through a pipeline provided with an oil consumption meter, a pressure sensor arranged in the engine and an angle mark meter connected with the engine are respectively connected with a combustion analyzer, an air inlet and exhaust simulation system is respectively connected with the air inlet valve and the exhaust valve, an engine control system is connected with the eddy current dynamometer, and a data acquisition system and a cooling water constant temperature control system are respectively connected with the engine.
The utility model discloses has following technological effect:
utilize the utility model discloses a device can obtain under 5500m height above sea level condition, compares with burning diesel oil, and diesel engine fires with PODE3～5When the diesel oil is mixed with fuel, the fuel injection quantity of each rotating speed cycle is increased by 9.3 percent on average; the fuel injection advance angle is reduced, and the average fuel injection advance angle is reduced by 2.9 degrees CA.
Drawings
FIG. 1 is a schematic structural diagram of the device of the present invention;
FIG. 2a shows a PODE obtained by calculation3～5The diesel oil mixed fuel diesel engine has a distribution diagram of 200 test points under the full load of the circulating fuel injection quantity;
FIG. 2b shows a PODE obtained by calculation3～5A distribution diagram of 200 test points of a diesel oil mixed fuel diesel engine under the full load of the common rail pressure;
FIG. 2c shows the PODE obtained by the calculation process3～5The fuel injection advance angle full load of the diesel oil mixed fuel diesel engine is 200 test point distribution diagrams;
FIG. 3 is PODE3～5The diesel oil mixed fuel diesel engine outputs a second-order response corresponding model schematic diagram;
FIG. 4a is a schematic diagram of optimal cyclic fuel injection amount at different altitudes and under different working conditions;
FIG. 4b is a schematic diagram of optimal injection timing at different altitudes and under different working conditions;
FIG. 4c is a diagram of an optimal injection strategy for different altitudes and different working conditions;
FIG. 5a is a graph comparing diesel fuel for diesel combustion with fuel injection amount of P20 at an altitude of 5500 m;
FIG. 5b is a graph comparing the fuel injection advance angle of diesel fuel for diesel engine with P20 at height 5500 m.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model discloses PODE3～5The measuring device for the altitude-variable oil injection control strategy of the diesel oil mixed fuel diesel engine comprises an eddy current dynamometer, an air intake and exhaust simulation system, an engine control system, a data acquisition system, a cooling water constant-temperature control system and a combustion analyzer, wherein the oil consumption of the engine in the test is measured by a transient oil consumption meter; the gas pipeline is provided with an air inlet valve 1, a flowmeter 2, a surge tank 3, an engine 4, an exhaust valve 5, a vacuum pump 6 and a pressure stabilizing tube 7 in sequence from an air inlet to an air outlet, the engine is connected with an eddy current dynamometer 8 through a connecting shaft, an oil injection tank 9 is connected with the engine through a pipeline provided with an oil consumption meter 10, and pressure arranged in the engineThe sensor 11 and an angle mark instrument 12 connected with the engine are respectively connected with the combustion analyzer, the air inlet and exhaust simulation system is respectively connected with an air inlet valve and an exhaust valve, the engine control system is connected with the electric eddy current dynamometer, and the data acquisition system and the cooling water constant temperature control system are respectively connected with the engine.
The utility model discloses PODE3～5A method for measuring a variable altitude oil injection control strategy of a diesel oil mixed fuel diesel engine adopts a method combining virtual calibration and test to obtain PODE for diesel engine combustion3～5The fuel injection control strategies of the diesel oil mixed fuel at different altitudes;
the virtual calibration is composed of a diesel engine high-altitude performance simulation model and a high-altitude virtual calibration system, and the two models respectively bear the functions of a virtual engine and a virtual test system.
(1)PODE3～5High-altitude performance simulation model of diesel oil mixed fuel diesel engine
According to the actual structure of the diesel engine, a GT-Power model of the working process of the high-pressure common-rail diesel engine is established by utilizing the GT-Power, the model consists of an air filter, a intercooler, an air inlet and exhaust passage, an air inlet and exhaust valve, a supercharger, an oil injector, a cylinder and an engine body, wherein the combustion model adopts an oil drop evaporation model, and the heat transfer model adopts a semi-empirical Woschni heat transfer model.
Model verification is carried out by selecting full-load working condition test data of diesel combustion P201000 r/min and 2100r/min under the conditions of 0m and 5500m, the simulated value of in-cylinder combustion pressure is relatively close to the test value, the error is within 5 percent, and the performance prediction requirement of the diesel is met.
Test results PODE3～5The measuring device (shown in figure 1) of the variable altitude injection control strategy of the diesel oil mixed fuel diesel engine is obtained.
(2)PODE3～5High-altitude virtual calibration system for diesel hybrid fuel diesel engine
PODE is established by MATLAB/Simulink simulation software3～5The high-altitude virtual calibration system of the diesel hybrid fuel diesel engine can enable a virtual calibration test to automatically run according to setting, automatically store and process the running result of the engine, and improve the efficiency of working condition setting and running.
PODE3～5The virtual calibration process of the diesel oil mixed fuel diesel engine comprises the following steps:
the method comprises the following steps of firstly, performing test design, namely obtaining representative test working condition points as few as possible by selecting a proper test design method;
secondly, performing an engine simulation test by using the working condition points obtained by the test design to obtain performance data related to the diesel engine;
thirdly, establishing an engine parameter response model by using the obtained data;
fourthly, selecting an optimization method for the generated response data to carry out optimization solution and obtain optimal control parameters;
fifthly, interpolating the obtained optimal control parameters to generate a pulse spectrum;
and sixthly, completing the verification of the calibration result through an engine performance test to complete the whole calibration process of the diesel engine.
In the test design, the altitude is selected from 6 altitudes of 0km, 1.5km, 2.5km, 3.5km, 4.5km and 5.5 km, and the rotating speed is selected from 6 rotating speeds of 1000r/min, 1200r/min, 1400r/min, 1500r/min, 1800 r/min and 2100 r/min. The selection of the quantity of the circulated injected oil, the pressure of the common rail and the timing of the injection is set with reference to the parameters of the injector and the actual injection characteristics under the plateau conditions of the diesel engine, as shown in table 1.
TABLE 1 oil injection parameter settings
FIG. 2a shows a PODE obtained by calculation3～5The diesel oil mixed fuel diesel engine has a distribution diagram of 200 test points under the full load of the circulating fuel injection quantity; FIG. 2b shows a PODE obtained by calculation3～5A distribution diagram of 200 test points of common rail pressure full load of a diesel oil mixed fuel diesel engine; FIG. 2c is a calculation processTo PODE3～5The fuel injection advance angle full load of the diesel oil mixed fuel diesel engine is 200 test point distribution diagrams.
Obtaining 200 groups of test data through GT-Power simulation operation, and establishing PODE3～5The diesel hybrid diesel engine outputs a corresponding model of the second order response as shown in fig. 3.
PODE can be predicted by using response model3～5The diesel oil mixed fuel diesel engine has the change relation of the performance parameters along with the variables of the circulating oil injection quantity, the common rail pressure, the oil injection advance angle and the like. In the virtual calibration process, the full load working condition takes the best dynamic performance (i.e. the maximum torque) as the optimization target, and takes the front exhaust temperature of the vortex (less than or equal to 720 ℃), the highest combustion pressure (less than or equal to 16MPa) and the rotating speed of the supercharger (less than or equal to 125000r/min) as the constraint limiting conditions to obtain the optimal circulating fuel injection quantity schematic diagrams of different altitudes and different working conditions, as shown in fig. 4 a; FIG. 4b is a schematic diagram of optimal injection timing at different altitudes and under different working conditions; fig. 4c is a schematic diagram of the optimum common rail pressure at different altitudes and under different working conditions.
Under the same altitude condition, the optimal circulating fuel injection quantity of the diesel engine combustion P20 is increased and then reduced along with the increase of the rotating speed; the circulating fuel injection quantity of the diesel engine is gradually reduced along with the rise of the altitude, the reduction trend is gradually increased along with the rise of the altitude, the average fuel injection quantity is reduced by 10.9% from 0m to 3500m, and the average fuel injection quantity is reduced by 20.4% from 3500m to 5500 m; the fuel injection advance angle is reduced and then increased along with the increase of the rotating speed, and the fuel injection advance angle is gradually increased along with the increase of the altitude; the common rail pressure tends to be stable after increasing with the rotation speed, and slightly decreases after increasing with the altitude.
Compared with diesel fuel under the altitude condition of 5500m, as shown in figure 5a which is a comparison graph of diesel fuel and P20 altitude 5500m fuel injection quantity and figure 5b which is a comparison graph of diesel fuel and P20 altitude 5500m fuel injection advance angle, PODE for diesel fuel combustion is shown3～5When the diesel oil is mixed with fuel, the fuel injection quantity of each rotating speed cycle is increased by 9.3 percent on average; the fuel injection advance angle is reduced, and the average fuel injection advance angle is reduced by 2.9 degrees CA.
Namely: with increasing altitude, PODE3～5The circulating fuel injection quantity of the diesel engine with the diesel mixed fuel is gradually reduced, the reduction trend is gradually increased along with the increase of the altitude, the average reduction is 10.9 percent from 0m to 3500m, and the average reduction is 3500mAn average decrease of 20.4% to 5500 m; the fuel injection advance angle is reduced and then increased along with the increase of the rotating speed, and the fuel injection advance angle is gradually increased along with the increase of the altitude; the common rail pressure tends to be stable after increasing with the rotation speed, and slightly decreases after increasing with the altitude.
The optimization problem belongs to a single-target multivariable multi-constraint nonlinear optimization problem, and the problems in the text can be effectively solved by calling an Fmincon optimization function in a CAGE tool box in Matlab for optimization. In the specific process of optimizing the oil injection parameters, the cyclic oil injection quantity, the oil injection advance angle and the common rail pressure under different working conditions are automatically optimized in a mode of fixing the altitude and the rotating speed.
During calibration, firstly, test design is completed, a virtual test is completed in a GT-Power model according to a test design result, diesel engine performance data under different working conditions and oil injection parameters are obtained, a model between diesel engine input parameters such as an oil injection advance angle and the like and output response parameters such as torque and the like is constructed by using the data, the model is optimized to obtain optimal control parameters of the diesel engine under different working conditions, the optimal control parameters are further utilized for interpolation to obtain optimal pulse spectrums of different atmospheric pressures of the oil injection parameters, and a diesel engine calibration result is tested by combining the optimal pulse spectrums.
Claims (1)
1. A measuring device for an oxygen-containing mixed fuel diesel engine variable altitude oil injection strategy is characterized by comprising an eddy current dynamometer, an air intake and exhaust simulation system, an engine control system, a data acquisition system, a cooling water constant temperature control system and a combustion analyzer; the gas pipeline is provided with an air inlet valve, a flowmeter, a pressure stabilizing tank, an engine, an exhaust valve, a vacuum pump and a pressure stabilizing tube in sequence from an air inlet to an air outlet, the engine is connected with an eddy current dynamometer through a connecting shaft, an oil injection tank is connected with the engine through a pipeline provided with an oil consumption meter, a pressure sensor arranged in the engine and an angle mark meter connected with the engine are respectively connected with a combustion analyzer, an air inlet and exhaust simulation system is respectively connected with the air inlet valve and the exhaust valve, an engine control system is connected with the eddy current dynamometer, and a data acquisition system and a cooling water constant temperature control system are respectively connected with the engine.
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| CN112431700A (en) * | 2020-11-20 | 2021-03-02 | 中国人民解放军陆军军事交通学院 | Measuring device and method for variable-altitude fuel injection strategy of oxygen-containing mixed fuel diesel engine |
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| CN112431700A (en) * | 2020-11-20 | 2021-03-02 | 中国人民解放军陆军军事交通学院 | Measuring device and method for variable-altitude fuel injection strategy of oxygen-containing mixed fuel diesel engine |
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