CN110608105B - Automatic calibration method and device for inflation efficiency - Google Patents
Automatic calibration method and device for inflation efficiency Download PDFInfo
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- CN110608105B CN110608105B CN201810622627.9A CN201810622627A CN110608105B CN 110608105 B CN110608105 B CN 110608105B CN 201810622627 A CN201810622627 A CN 201810622627A CN 110608105 B CN110608105 B CN 110608105B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0411—Volumetric efficiency
Abstract
The embodiment of the application discloses an automatic calibration method of inflation efficiency, which comprises the following steps: in the non-inflation efficiency calibration process of the engine, data required by inflation efficiency calibration are automatically acquired, the inflation efficiency of the engine is automatically calibrated by using the data required by the inflation efficiency, and a calibration result is automatically written into an engine electric control system. The charging efficiency of the engine and the ignition, oil injection, VVT control and the like based on the charging efficiency are enabled to become more and more accurate along with the operation of the engine without increasing human intervention. The method can effectively utilize data resources of other calibration tests of the engine, and can automatically provide more accurate calibration control parameters for the attached calibration test based on the data resources, so that the test can be operated more accurately, and the automatic calibration method and other calibration tests form a biological symbiotic relationship. The application also discloses a calibration device for the inflation efficiency.
Description
Technical Field
The application relates to the technical field of calibration, in particular to an automatic calibration method and device for inflation efficiency.
Background
The charging efficiency is the ratio of the mass of fresh air actually sucked into the cylinder in the cylinder of the internal combustion engine in each working cycle to the theoretical mass of air filled in the working volume of the cylinder in an air inlet channel state, reflects the perfection of the air inlet process, and is one of important indexes for measuring the air inlet performance of the engine. Therefore, the calibration of the charging efficiency is a core part in the engine calibration process.
Currently, engine calibration is to calibrate each basic performance of an engine on an engine bench. The calibration process of the engine inflation efficiency comprises the steps of setting a special inflation efficiency calibration test working condition by relying on an engine bench test room, acquiring data such as oil consumption by using an oil consumption meter of the test room under the working condition, calculating actual efficiency according to the data, obtaining the deviation of the model inflation efficiency calculated by an electric control system and the actual inflation efficiency inversely calculated by the oil consumption meter by comparing the model inflation efficiency calculated by the electric control system and the actual inflation efficiency, and correcting a correction coefficient in a model inflation efficiency calculation formula by using the deviation value to enable the model value to be consistent with the actual value, so that the calibration of the engine inflation efficiency is realized.
However, the items for engine bench calibration generally include: the method comprises the following steps of charging efficiency calibration, ignition angle calibration, torque correction calibration, power enrichment calibration, knock window calibration and the like. The calibration of the engine pedestal needs to perform a special calibration test for each project, the whole calibration process is very time-consuming, more than six months are often needed for a brand new project, the inflation efficiency calibration process accounts for about 30 to 40 percent of the total time consumption of the engine calibration, and at least two or three months are needed, so that the engine calibration efficiency is greatly limited, and the development and updating requirements of the automobile industry are difficult to meet.
Disclosure of Invention
The embodiment of the application provides an automatic calibration method and device of inflation efficiency, so that the total calibration time is reduced, the engine calibration efficiency is greatly improved, and the development and updating requirements of the automobile industry are met.
In view of the above, a first aspect of the present application provides an automatic calibration method of inflation efficiency, the method including:
acquiring data required for calibrating the inflation efficiency of the engine in the non-inflation efficiency calibration test process of the engine;
and automatically calibrating the inflation efficiency of the engine by using the data required for calibrating the inflation efficiency of the engine.
Optionally, the acquiring data required for calibrating the inflation efficiency includes:
acquiring the actual inflation efficiency of the engine;
obtaining the model inflation efficiency of the engine;
and acquiring working condition parameters of the engine.
Optionally, the obtaining an actual charging efficiency of the engine comprises:
and acquiring the actual inflation efficiency calculated by the engine management system by using the fuel flow.
Optionally, the obtaining of the actual charging efficiency calculated by the engine management system by using the fuel flow comprises:
an oil quantity measuring sensor is added in a vehicle oil circuit system, oil quantity data are integrated into an engine management system, fuel oil flow measured by the oil quantity measuring sensor in the vehicle oil circuit system and an excess air coefficient in waste gas measured by a wide oxygen sensor in an engine exhaust system are obtained by the engine management system, and actual inflation efficiency is obtained through calculation.
Optionally, the actual charge efficiency is calculated from the fuel flow, the excess air factor, the engine speed, and the engine displacement.
Optionally, the fuel flow comprises: the engine is at the fuel flow under steady operating conditions.
Optionally, the fuel flow of the engine under the steady condition is calculated according to the following formula:
and M is (M1-M2)/(T2-T1), wherein T1 is the starting time of the steady-state working condition, M1 is the oil quantity value at the time of T1, T2 is the current time, M2 is the current residual oil quantity, and M is the fuel flow corresponding to the current time of the engine under the steady-state working condition.
Alternatively, the steady state condition refers to an engine operating state in which the speed and load of the engine do not change.
Optionally, the obtaining of model inflation efficiency includes:
and obtaining the model inflation efficiency calculated by the inflation efficiency model in the engine management system.
Optionally, the obtaining operating condition parameters of the engine comprises:
and acquiring the rotating speed, the load, the variable valve timing and the variable valve lift of the engine.
Optionally, the automatically calibrating the charging efficiency of the engine by using the data required for calibrating the charging efficiency of the engine comprises:
and inputting the data required by calibrating the inflation efficiency of the engine into a preset inflation efficiency optimization algorithm, and calculating parameters of an inflation efficiency model of the engine according to the inflation efficiency optimization algorithm.
Optionally, the non-charging efficiency calibration test of the engine comprises any one of the following tests:
the method comprises an engine optimal parameter calibration test, an ignition angle calibration test, a torque correction calibration test, a power enrichment calibration test or a detonation window calibration test based on an engine bench.
The second aspect of the present application provides an automatic calibration device for inflation efficiency, the device comprising:
the acquiring module is used for acquiring data required by calibrating the inflating efficiency of the engine in the non-inflating efficiency calibration test process of the engine;
and the calibration module is used for automatically calibrating the inflation efficiency of the engine by using the data required by calibrating the inflation efficiency of the engine.
Optionally, the obtaining module includes:
the first obtaining submodule is used for obtaining the actual charging efficiency of the engine;
the second acquisition submodule is used for acquiring the model inflation efficiency of the engine;
and the third acquisition submodule is used for acquiring the working condition parameters of the engine.
Optionally, the first obtaining sub-module is specifically configured to:
and acquiring the actual inflation efficiency calculated by the engine management system by using the fuel flow.
Optionally, the first obtaining sub-module is specifically configured to:
and the actual inflation efficiency is calculated by the engine management system by utilizing the fuel flow measured by the oil quantity measuring sensor in the vehicle oil circuit system and the excess air coefficient in the exhaust gas measured by the wide oxygen sensor in the engine exhaust system.
Optionally, the actual charge efficiency is calculated from the fuel flow, the excess air factor, the engine speed, and the engine displacement.
Optionally, the fuel flow comprises: the engine is at the fuel flow under steady operating conditions.
Optionally, the fuel flow of the engine under the steady condition is calculated according to the following formula:
and M is (M1-M2)/(T2-T1), wherein T1 is the starting time of the steady-state working condition, M1 is the oil quantity value at the time of T1, T2 is the current time, M2 is the current residual oil quantity, and M is the fuel flow corresponding to the current time of the engine under the steady-state working condition.
Alternatively, the steady state condition refers to an engine operating state in which the speed and load of the engine do not change.
Optionally, the second obtaining sub-module is specifically configured to:
and obtaining the model inflation efficiency calculated by the inflation efficiency model in the engine management system.
Optionally, the third obtaining sub-module is specifically configured to:
and acquiring the rotating speed, the load, the variable valve timing and the variable valve lift of the engine.
Optionally, on the basis of the embodiment corresponding to fig. 3, referring to fig. 5, in another embodiment of the calibration apparatus for calibrating the inflation efficiency provided in the embodiment of the present application, the calibration module includes:
the input submodule is used for inputting data required by calibrating the charging efficiency of the engine into a preset charging efficiency optimization algorithm;
and the calculation submodule is used for calculating parameters of the inflation efficiency model of the engine according to the inflation efficiency optimization algorithm.
Optionally, the non-charging efficiency calibration test of the engine comprises any one of the following tests:
the method comprises an engine optimal parameter calibration test, an ignition angle calibration test, a torque correction calibration test, a power enrichment calibration test or a detonation window calibration test based on an engine bench.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides an automatic calibration method of inflation efficiency, which effectively utilizes data resources of other calibration tests of an engine, disperses the calibration process of the inflation efficiency to each operation of the engine, does not need to allocate special test resources and test time specially for calibration of the inflation efficiency, and utilizes the generated data to automatically calibrate an inflation efficiency model when other transmitters are used for calibration tests, namely, the data required by calibration of the inflation efficiency is actively obtained in the non-inflation efficiency calibration process of the engine, and then the obtained data required by calibration of the inflation efficiency of the engine is utilized to calibrate the inflation efficiency of the engine, and the calibration result is automatically written into an engine electric control system. The charging efficiency of the engine and the ignition, oil injection, VVT control and the like based on the charging efficiency are enabled to become more and more accurate along with the operation of the engine without increasing human intervention. The method can effectively utilize data resources of other calibration tests of the engine, and can automatically provide more accurate calibration control parameters for the attached calibration test based on the data resources, so that the test can be operated more accurately. Moreover, the automatic calibration method and other calibration tests form a biological symbiotic relationship, and the method can save the time for specially calibrating the inflation efficiency model, thereby improving the engine calibration efficiency and meeting the development and updating requirements of the automobile industry.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for automatic calibration of inflation efficiency in an embodiment of the present application;
FIG. 2 is a flowchart of an embodiment of a method for obtaining data required for calibration of inflation efficiency according to the present disclosure;
FIG. 3 is a schematic structural diagram of an embodiment of an automatic calibration device for inflation efficiency in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an embodiment of an automatic calibration device for inflation efficiency in an embodiment of the present application;
fig. 5 is a schematic structural diagram of an embodiment of an automatic calibration device for inflation efficiency in an embodiment of the present application.
Detailed Description
With the development of science and technology, vehicles have become vehicles widely used in daily life. The engine is a core component of the vehicle, and directly influences the performance of the vehicle. The charging efficiency is the basis of engine control, and affects the fuel injection, ignition and Variable Valve Timing (VVT) of the engine, and further affects the fuel consumption, emission and dynamic performance of the engine. Therefore, before the vehicle leaves the factory, the charging efficiency of the vehicle generally needs to be calibrated.
The traditional inflation efficiency calibration method mainly aims at that a vehicle-mounted ECU searches corresponding fuel injection quantity through a ratio A of exhaust pressure to intake pressure under different working conditions, and corrects the ratio A by adjusting the inflation efficiency value in the calibration process so as to determine the fuel injection quantity. The final purpose of calibrating the charging efficiency is to control the oil injection, ignition, VVT position and the like of the engine under various working conditions, so that the oil consumption, the dynamic property and the emission property of the engine during operation are optimal.
And the traditional calibration of the charging efficiency is carried out based on an engine bench. However, the engine mounts require calibration of several items such as charge efficiency, firing angle, torque correction, power enrichment, knock window, etc. The engine is subjected to special calibration tests aiming at each project, so that the time consumption of the whole calibration process is long, wherein the charging efficiency calibration accounts for 30% -40% of the total time consumption of the engine calibration, the efficiency of the engine calibration is greatly limited, the updating of the automobile is faster and faster, and the traditional calibration method is difficult to meet the updating requirement of the automobile industry.
In view of this, an embodiment of the present application provides a method for calibrating charging efficiency, which includes acquiring data required for calibrating charging efficiency of an engine during a non-charging efficiency calibration test of the engine, and calibrating the charging efficiency of the engine by using the data required for calibrating the charging efficiency of the engine.
The method effectively utilizes data resources of other calibration tests of the engine, disperses the calibration process of the inflation efficiency into each operation of the engine, does not need to allocate special test resources and test time specially for calibration of the inflation efficiency, and utilizes the generated data to automatically calibrate the inflation efficiency model in the calibration test of other transmitters, namely, actively acquires the data required by calibration of the inflation efficiency in the non-inflation efficiency calibration process of the engine, and further calibrates the inflation efficiency of the engine by utilizing the acquired data required by calibration of the inflation efficiency of the engine; by the method, the time for specially calibrating the inflation efficiency model can be saved, so that the engine calibration efficiency is improved, and the development and updating requirements of the automobile industry can be met.
The following describes a specific implementation manner of the calibration method for inflation efficiency provided by the embodiment of the present application with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for calibrating an inflation efficiency according to an embodiment of the present application, where the method includes:
s101: in the non-charging efficiency calibration test process of the engine, data required for calibrating the charging efficiency of the engine are obtained.
The charge efficiency of the engine is the ratio of the mass of fresh air actually sucked into the cylinder in the engine cylinder per working cycle of the internal combustion engine to the theoretical mass of air which fills the working volume of the cylinder in the state of an air inlet channel. The method comprises the steps of calibrating the inflating efficiency of the engine, namely obtaining the actual inflating efficiency and the model inflating efficiency of the engine, and correcting parameters of the model according to the difference value of the actual inflating efficiency and the model inflating efficiency to enable the model inflating efficiency to be consistent with the actual inflating efficiency.
Therefore, in order to achieve calibration of the charging efficiency of the engine, at least the actual charging efficiency and the model charging efficiency of the engine need to be obtained. It can be understood that the inflation efficiency of the engine can be different under different working conditions, and working condition parameters of the engine can be acquired in order to improve the calibration accuracy of the inflation efficiency. That is, the data required to calibrate the charging efficiency includes the actual charging efficiency, the model charging efficiency, and the operating condition parameters of the engine.
In the embodiment of the application, in order to save calibration time and improve calibration efficiency, data required for calibrating the inflation efficiency of the engine can be acquired in the non-inflation efficiency calibration test process of the engine. In some possible implementations of the embodiment of the present application, the calibration test of the non-charging efficiency of the engine may be an engine optimum parameter calibration test, an ignition angle calibration test, a torque correction calibration test, a power enrichment calibration test, or a knock window calibration test based on an engine mount.
It should be noted that the engine optimum parameter calibration test, the ignition angle calibration test, and the like are only some specific examples of the present application, and do not constitute a limitation to the technical solution of the present application, and in other possible implementation manners of the embodiment of the present application, data required for calibrating the charging efficiency of the engine may be acquired in other non-charging efficiency calibration test processes.
S102: and automatically calibrating the inflation efficiency of the engine by using the data required for calibrating the inflation efficiency of the engine.
After data required by calibrating the inflation efficiency of the engine are obtained, the actual inflation efficiency and the model inflation efficiency of the engine can be calculated, parameters of the model are corrected according to the difference value of the actual inflation efficiency and the model inflation efficiency, the model inflation efficiency is enabled to be identical with the actual inflation efficiency, and the calibration of the inflation efficiency is achieved.
It can be understood that the actual inflation efficiency and the model inflation efficiency of the engine are calculated, and the parameters of the model are corrected according to the difference value of the actual inflation efficiency and the model inflation efficiency, so that the model inflation efficiency is consistent with the actual inflation efficiency, and the method can be realized through an optimization algorithm. In some possible implementation manners of the embodiment of the present application, the data required for calibrating the charging efficiency of the engine may be input into a preset charging efficiency Optimization algorithm (SCOP), and the parameters of the charging efficiency model of the engine are calculated according to the charging efficiency Optimization algorithm, so as to calibrate the charging efficiency of the engine.
In the present embodiment, the charging efficiency model is obtained based on an empirical formula, such as pv ═ mRT, where the gas volume v can be measured, the reduced gas constant R is known, but the fresh intake partial pressure P and the temperature T are both difficult to measure directly, taking P as an example, only the pressure Pin of the intake port can be measured, and a series of corrections are involved from Pin to P. The correction is related to the condition parameters characterizing the engine condition, such as VVT, throttle and speed. Aiming at the pressure Pin of the same air inlet channel, the working condition parameters are different, the fresh air inlet partial pressure P is also different, and if the working condition parameters are fixed, the relation from Pin to P is relatively fixed, so that the correction pulse spectrum associated with the working condition parameters can be increased under the relatively stable working condition of the engine. The corrected pulse spectrum can be presented in a one-dimensional or two-dimensional table form, so that a user can inquire relevant data according to the corrected pulse spectrum.
And acquiring the deviation between the model inflation efficiency and the actual inflation efficiency under the specific working condition parameters, and then calculating a correction formula f (which can also be understood as a correction parameter or a correction coefficient) from Pin to p according to the deviation. And (4) according to the working condition parameters, filling the correction formula f into the position of the correction pulse spectrum corresponding to the working condition parameters, and completing the calibration of the working condition point. And when all the working conditions used by the engine are calibrated, completing the calibration of the air charging model of the engine. SCOP can classify data according to the operation working conditions, then a minimum error searching method is adopted to work out the optimal values under the corresponding working conditions, if the optimal values are directly filled into the correction pulse spectrum, the pulse spectrum is likely to be unsmooth, SCOP can also smooth the correction pulse spectrum according to a set smoothing factor and by taking the global error as the principle, and after the smoothing treatment, corresponding working condition parameter values are written into the corresponding correction pulse spectrum.
In some possible implementation manners of the embodiment of the application, in order to improve efficiency, an INCA tool developed by ETAS may be used to obtain model inflation efficiency calculated by an inflation model in an engine management system, perform data interaction through an interface program of INCA and Matlab, input data required for calibrating the inflation efficiency of an engine into an SCOP, and the SCOP may optimize the inflation model in real time according to the received data and transmit an optimization result to the engine management system through the interface program to perform engine control. It should be noted that the data received by the SCOP can be optimized after covering a certain engine operating condition, so as to save the computing resources.
In some possible implementation manners of the embodiment of the application, the parameters of the inflation efficiency model of the engine calculated according to the inflation efficiency optimization algorithm can be implemented in the following manner, specifically, the parameters of the inflation model are corrected by correcting a pulse spectrum, so that the inflation efficiency of the model is consistent with the actual inflation efficiency. Through the correction, the model inflation efficiency can be more accurate, and the correct control of the ignition, the oil injection, the air intake and exhaust phases and the like of the engine is facilitated.
It can be seen from the above that, the present application provides an inflation efficiency calibration method, which effectively utilizes data resources of other calibration tests of an engine, disperses the calibration process of the inflation efficiency into each operation of the engine, does not need to allocate special test resources and test time specially for calibration of the inflation efficiency, and utilizes data generated by other transmitters during calibration tests to automatically calibrate an inflation efficiency model, that is, in the non-inflation efficiency calibration process of the engine, data required for calibration of the inflation efficiency is actively obtained, and further the obtained data required for calibration of the inflation efficiency of the engine is utilized to automatically calibrate the inflation efficiency of the engine, and a calibration result is automatically written into an engine electrical control system. The charging efficiency of the engine and the ignition, oil injection, VVT control and the like based on the charging efficiency are enabled to become more and more accurate along with the operation of the engine without increasing human intervention. The method can effectively utilize data resources of other calibration tests of the engine, and can automatically provide more accurate calibration control parameters for the attached calibration test based on the data resources, so that the test can be operated more accurately. Moreover, the automatic calibration method and other calibration tests form a biological symbiotic relationship, and the method can save the time for specially calibrating the inflation efficiency model, thereby improving the engine calibration efficiency and meeting the development and updating requirements of the automobile industry.
In the embodiment shown in fig. 1, S101 may be implemented in various ways. For ease of understanding, a specific implementation of the data required for obtaining the calibration inflation efficiency in S101 is described next with a specific embodiment.
FIG. 2 shows a flow chart of a method of obtaining data required for calibrating inflation efficiency, see FIG. 2, the method comprising:
s1011: and acquiring the actual charging efficiency of the engine.
Because the inflation efficiency of the engine directly influences the fuel injection quantity of the engine, namely, a corresponding relation exists between the inflation efficiency of the engine and the fuel injection quantity, the inflation efficiency of the engine can be determined according to the corresponding relation and the fuel injection quantity of the engine.
In some possible implementation manners of the embodiment of the application, the actual charging efficiency calculated by the engine management system by using the fuel flow can be obtained. For convenience of description, the fuel flow is expressed by M, and the actual charging efficiency is represented by phiactAnd (4) performing representation.
The fuel flow may be a fuel flow of the engine under a stable condition. The stable working condition refers to a working condition that the rotating speed and the load of the engine are stable and unchanged. And judging whether the engine is in a stable working condition, and measuring whether the load is changed or not through the pressure of a throttle valve or an intake manifold so as to determine the working condition of the engine. For ease of understanding, this is illustrated. For example, the throttle opening of the engine is changed slightly, and the change range is 9.9% -10.1%, and the engine is considered to be in a stable working condition. For another example, if the engine has a small change in intake manifold pressure, fluctuating within the range of 500hPa to 510hPa, the engine may be deemed to be in a steady state condition.
The fuel flow of the engine under the stable working condition is calculated according to the following formula:
wherein, T1At the starting point of the steady-state operating mode, M1Is T1Oil quantity value at time, T2For the current time, M2And M is the fuel flow corresponding to the current moment of the engine under the stable working condition. It will be appreciated that the longer the engine is operating in this steady state condition, the more accurate the measured fuel flow.
It should be noted that the oil amount value at each time may be measured by an oil amount measuring sensor. As one example, a weighted oil level sensor may be used to measure the amount of oil at each time. In order to improve the reliability of the measured value of the fuel flow, only the fuel flow data under the stable working condition can be adopted, and the fuel flow data under the unstable working condition is not adopted.
In some possible implementations of the embodiments of the present application, the engine management system may calculate the actual charging efficiency using a fuel flow measured by a fuel quantity measuring sensor in the vehicle oil system and an excess air ratio in the exhaust gas measured by a wide oxygen sensor in the engine exhaust system.
The engine exhaust system refers to a system for exhausting waste gas after combustion of an engine, and comprises an exhaust pipe, a catalytic bag and the like. In the present embodiment, a wide oxygen sensor is also included in the engine exhaust system to measure the excess air ratio LA4, i.e., the ratio of the mass of air admitted for actual combustion to the mass of air used for theoretical combustion. It should be noted that the wide oxygen sensor may be preset in the vehicle or may be installed for calibration of the charging efficiency.
After the excess air coefficient LA4 is obtained, the actual intake air amount of the engine may be calculated according to the excess air coefficient, the fuel injection amount, and the air-fuel ratio R _ AF, and for convenience of description, the intake air amount is expressed by M _ air, and then M _ air may be specifically calculated by the following formula:
M_air＝M·R_AF·LA4 (2)
wherein, M is the fuel flow measured and calculated by the fuel quantity measuring sensor, and R _ AF is the ratio of the air mass and the fuel mass in the combustible mixture, namely the air-fuel ratio. Where the air-fuel ratio is the chemical property of the fuel, and the fuel chemistry is determined, the air-fuel ratio term is determined accordingly. When the fuel is gasoline, the air-fuel ratio is generally about 14.7.
The charge efficiency of the engine is the ratio of the actual air intake quantity sucked into the cylinder per cycle of the engine to the theoretical air intake quantity filled with the working volume of the cylinder, the air density is 1.293g/L in a standard state, and if the unit of M is kg/h, the rotating speed of the engine is n, the rotating speed unit is rpm, the displacement of the engine is v, and the displacement unit is L, the actual charge efficiency phi isactCan be calculated by the following formula:
where M _ air · 1000 is the actual intake air amount, and the unit is converted from kg/h to g/h by multiplying 1000. In a similar manner, the first and second substrates are,
indicating the number of cycles of the four-stroke engine per hour, 1.293 · v indicating the theoretical intake air amount per cycle,
the unit of the theoretical air inflow of the working volume of the full cylinder per hour is g/h, so that the unit unification of the actual air inflow and the theoretical air inflow can be realized, and the actual air inflow efficiency can be obtained through the ratio of the actual air inflow to the theoretical air inflow.
That is, the actual charge efficiency may be calculated based on the fuel flow, the excess air ratio, the engine speed, and the engine displacement.
S1012: and obtaining the model inflation efficiency of the engine.
The model charging efficiency of the engine refers to a predicted value of the charging efficiency of the engine by a charging model of the engine. The charge model is a series of empirical formulas used by the engine management system to calculate charge efficiency. After the model inflation efficiency is obtained through the inflation efficiency model calculation in the engine management system, the model inflation efficiency can be obtained from the engine management system. In some possible implementation manners of the embodiment of the application, the charging efficiency model may calculate the charging efficiency of the model according to parameters such as the intake pressure and the temperature measured by the sensor. In this embodiment, the empirical formula for calculating the inflation efficiency may include:
PV＝mRT (4)
wherein P is gas pressure, V is gas volume, m represents gas mass, T represents gas thermodynamic temperature, and R is a reduced gas constant. In other possible implementation manners of the embodiment of the application, the empirical formula can be corrected, so that the model inflation efficiency is more consistent with the actual inflation efficiency.
S1013: and acquiring working condition parameters of the engine.
The operating condition parameter refers to a parameter representing the current working condition of the engine. Specifically to the embodiment, the operating condition parameters are mainly parameters related to the engine charging efficiency, such as the rotating speed, the load, the variable valve timing and the variable valve lift of the engine. Therefore, the rotation speed, the load, the Variable Valve timing and the Variable Valve Lift (VVL) of the engine can be obtained and used for calibrating the charging efficiency of the engine.
The rotation speed of the engine can be measured by a rotation speed sensor, and more specifically, the rotation speed can be measured by a hall-type rotation speed sensor. The engine load is the ratio of the power of the engine at a certain speed of rotation to the maximum power that can be emitted at the same speed of rotation, generally expressed in percentage. In some cases, engine load may also be characterized by throttle size, throttle opening, vacuum, etc.
In the present embodiment, the valve timing is also referred to as a valve timing, the valve timing is an opening/closing time of an intake valve or an exhaust valve, and the valve lift is an opening/closing degree of the intake valve or the exhaust valve. Valve timing and valve lift are important factors that affect engine performance and charging efficiency. Therefore, when calibrating the charging efficiency of the engine, the influence of the valve timing and the valve lift of the engine on the charging efficiency needs to be considered. In order to improve the accuracy of the charging efficiency calibration, the VVT and the VVL of the engine can be obtained to calibrate the charging efficiency.
It should be noted that, in the embodiment of the present application, the execution sequence of the above steps S1011 to S1013 is not limited, and in a possible implementation manner, the steps S1011 to S1013 may be executed simultaneously or in a preset sequence, and the execution sequence of the above steps does not affect the specific implementation of the present application.
Therefore, the method for automatically acquiring the data required by the calibration of the inflation efficiency is provided, the actual inflation efficiency, the model inflation efficiency and the engine working condition parameters are acquired in other calibration test processes of the engine, and the inflation model of the engine can be corrected according to the actual inflation efficiency, the model inflation efficiency and the engine working condition parameters, so that the automatic calibration of the inflation efficiency is realized.
The method effectively utilizes data resources of other calibration tests of the engine, disperses the calibration process of the inflation efficiency into each operation of the engine, does not need to allocate special test resources and test time specially for the calibration of the inflation efficiency, and utilizes the generated data to automatically calibrate the inflation efficiency model and automatically write the calibration result into an engine electric control system when other transmitters perform calibration tests. The charging efficiency of the engine and the ignition, oil injection, VVT control and the like based on the charging efficiency are enabled to become more and more accurate along with the operation of the engine without increasing human intervention. The method can effectively utilize data resources of other calibration tests of the engine, and can automatically provide more accurate calibration control parameters for the attached calibration test based on the data resources, so that the test can be operated more accurately. Moreover, the automatic calibration method and other calibration tests form a biological symbiotic relationship, and the method can save the time for specially calibrating the inflation efficiency model, thereby improving the engine calibration efficiency and meeting the development and updating requirements of the automobile industry.
Based on the specific implementation manner of the calibration method for the inflation efficiency provided by the embodiment of the application, the application also provides a calibration device for the inflation efficiency.
Next, the calibration device for inflation efficiency provided by the embodiments of the present application will be described in detail from the perspective of functional modularization with reference to the accompanying drawings.
Fig. 3 is a schematic structural diagram of an automatic calibration device for inflation efficiency according to an embodiment of the present application, please refer to fig. 3, wherein the device 300 includes:
the acquiring module 310 is used for acquiring data required for calibrating the charging efficiency of the engine in the non-charging efficiency calibration test process of the engine;
a calibration module 320 for calibrating the charging efficiency of the engine using the data required for calibrating the charging efficiency of the engine.
Optionally, on the basis of the embodiment corresponding to fig. 3, referring to fig. 4, in another embodiment of the automatic calibration device for inflation efficiency provided by the embodiment of the present application,
the obtaining module 310 includes:
a first obtaining submodule 311 for obtaining an actual charging efficiency of the engine;
a second obtaining submodule 312 for obtaining a model charging efficiency of the engine;
and the third acquisition submodule 313 is used for acquiring the working condition parameters of the engine.
Optionally, the first obtaining sub-module 311 is specifically configured to: and acquiring the actual inflation efficiency calculated by the engine management system by using the fuel flow.
Optionally, the first obtaining sub-module 311 is specifically configured to:
and the actual inflation efficiency is calculated by the engine management system by utilizing the fuel flow measured by the oil quantity measuring sensor in the vehicle oil circuit system and the excess air coefficient in the exhaust gas measured by the wide oxygen sensor in the engine exhaust system.
Optionally, the actual charge efficiency is calculated from the fuel flow, the excess air factor, the engine speed, and the engine displacement.
Optionally, the fuel flow comprises: the engine is at the fuel flow under steady operating conditions.
Optionally, the fuel flow of the engine under the steady condition is calculated according to the following formula:
and M is (M1-M2)/(T2-T1), wherein T1 is the starting time of the steady-state working condition, M1 is the oil quantity value at the time of T1, T2 is the current time, M2 is the current residual oil quantity, and M is the fuel flow corresponding to the current time of the engine under the steady-state working condition.
Alternatively, the steady state condition refers to an engine operating state in which the speed and load of the engine do not change.
Optionally, the second obtaining sub-module 312 is specifically configured to:
and obtaining the model inflation efficiency calculated by the inflation efficiency model in the engine management system.
Optionally, the third obtaining sub-module 313 is specifically configured to:
and acquiring the rotating speed, the load, the variable valve timing and the variable valve lift of the engine.
Optionally, on the basis of the embodiment corresponding to fig. 3, referring to fig. 5, in another embodiment of the automatic calibration device for inflation efficiency provided in the embodiment of the present application, the calibration module 320 includes:
the input submodule 321 is used for inputting the data required by calibrating the charging efficiency of the engine into a preset charging efficiency optimization algorithm;
and the calculation submodule 322 is used for calculating parameters of the charging efficiency model of the engine according to the charging efficiency optimization algorithm.
Optionally, the non-charging efficiency calibration test of the engine comprises any one of the following tests:
the method comprises an engine optimal parameter calibration test, an ignition angle calibration test, a torque correction calibration test, a power enrichment calibration test or a detonation window calibration test based on an engine bench.
Therefore, the device for calibrating the inflation efficiency comprises an acquisition module and a calibration module, wherein the acquisition module can actively acquire data required by the calibration of the inflation efficiency in the non-inflation efficiency calibration process of the engine, and further utilizes the acquired data to calibrate the inflation efficiency of the engine, and the calibration module can calibrate the inflation efficiency of the engine by utilizing the data required by the calibration of the inflation efficiency acquired by the acquisition module and automatically write a calibration result into an engine electric control system. The charging efficiency of the engine and the ignition, oil injection, VVT control and the like based on the charging efficiency are enabled to become more and more accurate along with the operation of the engine without increasing human intervention. . The method effectively utilizes data resources of other calibration tests of the engine, disperses the calibration process of the inflation efficiency into each operation of the engine, does not need to allocate special test resources and test time specially for the calibration of the inflation efficiency, and utilizes the generated data to automatically calibrate the inflation efficiency model when other transmitters are used for calibration tests. The method can effectively utilize data resources of other calibration tests of the engine, and can automatically provide more accurate calibration control parameters for the attached calibration test based on the data resources, so that the test can be operated more accurately. In addition, the automatic calibration method and other calibration tests form a biological symbiotic relationship, and the time for specially calibrating the inflation efficiency model can be saved, so that the engine calibration efficiency is improved, and the development and updating requirements of the automobile industry are met.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (13)
1. An automatic calibration method for inflation efficiency is characterized by comprising the following steps:
in the non-inflation efficiency calibration test process of the engine, automatically acquiring data required for calibrating the inflation efficiency of the engine;
and automatically calibrating the inflation efficiency of the engine by using the data required for calibrating the inflation efficiency of the engine.
2. The method of claim 1, wherein said obtaining data required to calibrate a charging efficiency of an engine comprises:
acquiring the actual inflation efficiency of the engine;
obtaining the model inflation efficiency of the engine;
and acquiring working condition parameters of the engine.
3. The method of claim 1, wherein said obtaining an actual charge efficiency of the engine comprises:
and acquiring the actual inflation efficiency calculated by the engine management system by using the fuel flow.
4. The method of claim 3, wherein obtaining the actual charge efficiency calculated by the engine management system using the fuel flow comprises:
an oil quantity measuring sensor is added in a vehicle oil circuit system, oil quantity data are integrated into an engine management system, fuel oil flow measured by the oil quantity measuring sensor in the vehicle oil circuit system and an excess air coefficient in waste gas measured by a wide oxygen sensor in an engine exhaust system are obtained by the engine management system, and actual inflation efficiency is obtained through calculation.
5. The method of claim 4, wherein the actual charge efficiency is calculated based on the fuel flow, the excess air factor, engine speed, and engine displacement.
6. The method of any one of claims 3 to 5, wherein the fuel flow rate comprises: the engine is at the fuel flow under steady operating conditions.
7. The method of claim 6, wherein the fuel flow for the engine at steady state conditions is calculated according to the following equation:
and M is (M1-M2)/(T2-T1), wherein T1 is the starting time of the steady-state working condition, M1 is the oil quantity value at the time of T1, T2 is the current time, M2 is the current residual oil quantity, and M is the fuel flow corresponding to the current time of the engine under the steady-state working condition.
8. The method of claim 7, wherein the steady state operating condition is an engine operating condition in which engine speed and load do not change.
9. The method of claim 2, wherein said obtaining a model charge efficiency of an engine comprises:
and obtaining the model inflation efficiency calculated by the inflation efficiency model in the engine management system.
10. The method of claim 2, wherein said obtaining operating condition parameters of the engine comprises:
and acquiring the rotating speed, the load, the variable valve timing and the variable valve lift of the engine.
11. The method of claim 1, wherein said automatically calibrating the charge efficiency of the engine using the data required to calibrate the charge efficiency of the engine comprises:
and inputting the data required by calibrating the inflation efficiency of the engine into a preset inflation efficiency optimization algorithm, and calculating parameters of an inflation efficiency model of the engine according to the inflation efficiency optimization algorithm.
12. The method of claim 1, wherein the non-charging efficiency calibration test of the engine comprises any one of:
the method comprises an engine optimal parameter calibration test, an ignition angle calibration test, a torque correction calibration test, a power enrichment calibration test or a detonation window calibration test based on an engine bench.
13. An automatic calibration device for inflation efficiency is characterized by comprising:
the acquiring module is used for acquiring data required by calibrating the inflating efficiency of the engine in the non-inflating efficiency calibration test process of the engine;
and the calibration module is used for automatically calibrating the inflation efficiency of the engine by using the data required by calibrating the inflation efficiency of the engine.
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