CN109882300B - Method and device for correcting inflation efficiency - Google Patents
Method and device for correcting inflation efficiency Download PDFInfo
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- CN109882300B CN109882300B CN201711275927.6A CN201711275927A CN109882300B CN 109882300 B CN109882300 B CN 109882300B CN 201711275927 A CN201711275927 A CN 201711275927A CN 109882300 B CN109882300 B CN 109882300B
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Abstract
The invention discloses a method and a device for correcting inflation efficiency, wherein the method comprises the following steps: acquiring the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibration machine under the same operating condition parameters, wherein the calibration machine is used for calibrating and calibrating the engine; obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; determining a target correction term according to the pressure difference of the first air inlet pipe; and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula. Therefore, a correction term is obtained according to the difference between the pressures of the air inlet pipes of the engine and the calibration machine, the correction term is integrated into the original inflation efficiency calculation formula, the actual inflation efficiency deviation caused by manufacturing, processing, installation dispersion difference and the like among the engines can be corrected, and the problem that the actual inflation efficiency of the engine of the same model or the similar model with the dispersion difference with the calibration machine is inconsistent with the inflation efficiency calculated by the calibration machine is solved.
Description
Technical Field
The invention relates to the technical field of data analysis and calculation, in particular to a method and a device for correcting inflation efficiency.
Background
In practical applications, the control of an automobile engine is based on the charging efficiency, which is also called the charging charge coefficient, and refers to the ratio of the mass of fresh air actually sucked into an engine cylinder to the theoretical mass of air filled in the working volume of the cylinder in an air inlet passage state in each working cycle of the internal combustion engine. Since the deviation of the charging efficiency calculation may cause deviation of parameters related to oil injection, ignition, Variable Valve Timing (VVT), and the like, that is, the controlled parameters are not preset optimized parameters, and thus the optimization of oil consumption, emission, and power performance of the engine cannot be realized, the accurate calculation of the charging efficiency is a basic premise for controlling the engine.
In the prior art, an inflation efficiency calculation method is mainly based on an empirical formula of fluid mechanics and assisted by map correction. For other engines of the same model, the charging efficiency is calculated by directly calibrating the charging efficiency by using a calibration machine. That is, the calculated charging efficiency is the same as that of the calibration engine as long as the control parameters of the calibration engine are the same. Because the charging efficiency is the ratio of the mass of the fresh air flowing into the cylinder per cycle of a single cylinder to the theoretical charging mass calculated according to the air inlet state, factors influencing the gas flow of the engine influence the actual air inlet amount, and further influence the calculation of the charging efficiency.
The inventor finds that the actual air inflow is influenced by the intake flow resistance, the intake temperature rise, the intake and exhaust phase angle, the exhaust flow resistance (influencing the temperature when the exhaust valve is closed and the pressure in the cylinder), and the like, so that the actual inflation efficiency and the inflation efficiency calculated by a calibration computer deviate. The existing method for calculating the inflation efficiency is to assume that all engines of the same type correspond to the same calibration machine, and the factors influencing the gas flow of the engines are consistent or have small deviation and can be ignored, so that the inflation efficiency of all the engines of the same type obtained by calculation is the same under the same operating condition. However, since the engine is a very complicated device, the processing technology of each part and the installation of each part cannot be completely precise, and there are inevitable deviations between different engines of the same model, which results in different actual air intakes between different engines of the same model and different actual charging efficiencies of different engines of the same model. Therefore, the charging efficiency calculated by the prior art method is not accurate for different engines of the same model with processing and installation deviation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for correcting the inflation efficiency, which are used for correcting the deviation caused by processing and installation among different engines of the same model so as to obtain more accurate inflation efficiency corresponding to different engines of the same model.
In a first aspect, an embodiment of the present invention provides a method for correcting inflation efficiency, where the method includes:
acquiring the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibrating machine under the same operating condition parameters, wherein the calibrating machine is used for calibrating and calibrating the engine;
obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine;
determining a target correction term according to the first air inlet pipe pressure difference;
and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas.
Preferably, the operating condition is a characteristic operating condition, and the characteristic operating condition is an operating condition with high occurrence frequency in the operating process of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition.
Preferably, the determining a target correction term according to the first intake pipe pressure difference specifically includes:
acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation;
the second intake pipe pressure difference is determined as the target correction term.
Preferably, the determining a target correction term according to the first intake pipe pressure difference specifically includes:
acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation;
obtaining a correction coefficient according to the operating condition parameters and correction tables in a correction table set corresponding to the operating condition parameters, wherein the correction tables in the correction table set are preset according to measured data of two engines with deviation in actual operation;
obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient;
determining the third intake pipe pressure difference as the target correction term.
Preferably, the set of correction tables includes one or more of a correction table corresponding to a rotation speed and a load, a correction table corresponding to a rotation speed and an intake valve timing, and a correction table corresponding to a rotation speed and an exhaust valve timing.
In a second aspect, an embodiment of the present invention provides an apparatus for modifying inflation efficiency, including:
the system comprises an air inlet pipe pressure acquisition unit, a calibration unit and a control unit, wherein the air inlet pipe pressure acquisition unit is used for acquiring the air inlet pipe pressure of an engine and the air inlet pipe pressure of a calibration machine under the same operating condition parameters, and the calibration machine is used for calibrating the engine;
the first air inlet pipe pressure difference obtaining unit is used for obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine;
the target correction term determining unit is used for determining a target correction term according to the first air inlet pipe pressure difference;
and the inflation efficiency obtaining unit is used for obtaining the inflation efficiency of the engine after correction according to the target correction term and a preset inflation efficiency calculation formula, and the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas.
Preferably, the operating condition is a characteristic operating condition, and the characteristic operating condition is an operating condition with high occurrence frequency in the operating process of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition.
Preferably, the target correction term determination unit specifically includes a second intake pipe pressure difference obtaining subunit and a target correction term determination subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the target correction term determination subunit is configured to determine the second intake pipe pressure difference as the target correction term.
Preferably, the target correction term determining unit specifically includes a second intake pipe pressure difference obtaining subunit, a correction coefficient obtaining subunit, a third intake pipe pressure difference obtaining subunit, and a target correction term determining subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the correction coefficient obtaining subunit is configured to obtain a correction coefficient according to the operating condition parameter and a correction table in a correction table set corresponding to the operating condition parameter, where the correction table in the correction table set is preset according to measurement data of two engines with deviation in actual operation;
the third air inlet pipe pressure difference obtaining subunit is used for obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient;
the target correction term determination subunit is configured to determine the third intake pipe pressure difference as the target correction term.
Preferably, the set of correction tables includes one or more of a correction table corresponding to a rotation speed and a load, a correction table corresponding to a rotation speed and an intake valve timing, and a correction table corresponding to a rotation speed and an exhaust valve timing.
Compared with the prior art, the invention has at least the following advantages:
by adopting the technical scheme of the embodiment of the invention, the pressure of the air inlet pipe of the engine and the pressure of the air inlet pipe of a calibration machine under the same operating condition parameters are obtained, wherein the calibration machine is used for calibrating the engine; obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; determining a target correction term according to the first air inlet pipe pressure difference; and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas. Therefore, a correction term can be obtained according to the difference between the pressures of the air inlet pipes of the engine and the calibration machine, the correction term is integrated into the original inflation efficiency calculation formula, the actual inflation efficiency deviation caused by manufacturing, processing, installation dispersion difference and the like among the engines can be corrected, and the problem that the actual inflation efficiency of the engine of the same type or the similar type with the dispersion difference of the calibration machine is inconsistent with the inflation efficiency calculated by the calibration machine is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a system framework involved in an application scenario according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for modifying inflation efficiency according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of gas flow during intake of a cylinder operating cycle of an engine provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for correcting inflation efficiency according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor finds that, in the existing mode of calculating the inflation efficiency, it is assumed that all engines of the same model and corresponding calibration machines have the same factors influencing the gas flow of the engines, or the deviation is very small and can be ignored, so that under the same operating condition, the inflation efficiency of the calibration machines is calculated by taking the empirical formula of fluid mechanics as the main part and taking a map as the auxiliary part, and the inflation efficiency obtained by calculation is taken as the inflation efficiency of all the engines of the same model. However, since the engine is a very complicated device, the processing technology of each part and the installation of each part are not completely accurate, and there are inevitable variations between different engines of the same model, which results in variations in factors affecting the gas flow of the engine, such as different intake flow resistance, intake temperature rise, intake and exhaust phase angle, exhaust flow resistance, etc. of different engines of the same model, and further, different actual intake air amounts between different engines of the same model, that is, different actual charging efficiencies of different engines of the same model. Therefore, the charging efficiency calculated using the prior art method is not accurate for different engines of the same model.
That is, the charging efficiency calculated in the prior art has a deviation, and the deviation may cause a deviation in controlling parameters related to fuel injection, ignition, Variable Valve Timing (VVT), and the like, so that optimization of fuel consumption, emission, and power performance of the engine cannot be realized. For example, in a certain operation condition of the engine, the engine is originally ignited 5 degrees before the top dead center, and the power, the fuel consumption, the combustion stability and the like are the best, but due to the charging efficiency deviation, the ignition time of the engine is changed into 0 degree, and various performances are not good.
In order to solve the problem, in the embodiment of the invention, the air inlet pipe pressure of the engine and the air inlet pipe pressure of a calibration machine under the same operating condition parameters are obtained, wherein the calibration machine is used for calibrating and calibrating the engine; obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; determining a target correction term according to the first air inlet pipe pressure difference; and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas. Therefore, a correction term can be obtained according to the difference between the pressures of the air inlet pipes of the engine and the calibration machine, the original inflation efficiency calculation formula of the calibration machine is corrected by the correction term, more accurate inflation efficiency of the engine is obtained, and the problems that the inflation efficiency calculated by the calibration machine is the same but the actual inflation efficiency is different between different engines of the same type under the same working condition are solved.
For example, one of the scenarios of the embodiment of the present invention may be applied to the scenario shown in fig. 1. The scene includes a sensor 101, a processor 102, and a controller 103. The processor 102 acquires the air inlet pipe pressure of the engine obtained by the sensor 101 under the same operating condition parameters and the pre-stored air inlet pipe pressure of a calibration machine, wherein the calibration machine is used for calibrating and calibrating the engine; the processor 102 obtains a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; the processor 102 determines a target correction term according to the first air inlet pipe pressure difference; the processor 102 obtains the charging efficiency of the engine after correction according to the target correction term and a preset charging efficiency calculation formula; the processor 102 transmits the charging efficiency to the controller 103, so that the controller 103 controls parameters of the engine, such as fuel injection, ignition, variable valve timing and the like, to be optimized according to the charging efficiency, and therefore oil consumption, emission and power performance of the engine are optimized.
It will be appreciated that in the application scenarios described above, the actions of the embodiments of the present invention are described as being performed by the processor 102. However, the present invention is not limited in terms of the execution of the subject matter, so long as the acts disclosed in the embodiments of the present invention are performed.
It is to be understood that the above scenario is only one scenario example provided by the embodiment of the present invention, and the embodiment of the present invention is not limited to this scenario.
The following describes in detail a specific implementation manner of the method and the apparatus for calculating inflation efficiency according to the embodiment of the present invention, with reference to the accompanying drawings.
Exemplary method
Referring to FIG. 2, a flow diagram of a method for modifying charging efficiency in an embodiment of the invention is shown. In this embodiment, the method may include, for example, the steps of:
step 201: and acquiring the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibrating machine under the same operating condition parameters, wherein the calibrating machine is used for calibrating and calibrating the engine.
It should be noted that, under the same operating condition, the charging efficiency of all engines of the same model calculated based on the calibration computer is the same, however, the engines are very complicated devices, the processing technology of each part and the installation of each part are not completely accurate, and there are inevitable deviations between different engines of the same model, which cause deviations in factors affecting the gas flow of the engines, and the actual charging efficiency of different engines of the same model is different. Therefore, in order to obtain the actual charging efficiency of different engines of the same model, it is necessary to know the deviation of the gas flow between the engine and the calibration machine, and further correct the charging efficiency calculated by the calibration machine.
First, it can be known that the differential equation of the gas flowing through the throttle body is as follows:
wherein μ and A respectively represent the flow coefficient at the valveAnd a flow area; p is a radical ofI，pⅡRespectively representing the pressure in front of the throttle body and the pressure behind the throttle body; rho1For the air density before the throttle, k is an isentropic index (for an engine, k is usually 1.4), and n is the engine speed.
The gas flow in the intake of the engine cylinder cycle is schematically shown in fig. 3, where 1 is a throttle valve, 2 is an intake valve, 3 is an exhaust valve, 4 is a piston, 5 is a cylinder, 6 is an intake pipe, and 7 is an exhaust pipe. From the above equation, it can be seen that as long as the intake pipe pressure p is setⅡ<pI0.528 for a certain fixed flow area (throttle opening), regardless of pⅡHow to change the flow rate m of gas flowing from the throttle valve into the intake manifoldinAt a certain engine speed, the suction force generated by the downward movement of the piston is the pressure p in the cylindercylAnd is not changed. For example, the pre-throttle pressure pI1013kPa, intake pipe pressure pⅡ<pI0.528-535 kPa at fixed flow area minConstant, specific engine speed pcylAnd is not changed. At intake pipe pressure pⅡWith the pressure p in the cylindercylThe gas flows out of the gas inlet pipe and flows into the cylinder under the action of the pressure difference, and the flow is recorded as mout. When m isinAnd moutWhen dynamic balance is achieved, the engine runs stably, and at the moment, the pressure p of the air inlet pipe among different enginesⅡThe difference represents the difference in intake resistance between the different engines.
From the above analysis, the conclusion is that: pressure p of engine intake pipeⅡHigher indicates that the engine requires a higher intake pipe pressure pⅡWith the pressure p in the cylindercylCan be the same as other engines, i.e. the engine intake pipe pressure pⅡThe higher the resistance to gas flow into the cylinder through the intake pipe. Based on this conclusion, the condition of the intake resistance difference between the engine and the calibration engine can be determined by acquiring the intake pipe pressure difference between different engines and the calibration engine.
It should be noted that there are many operating conditions of the engine, and attention may be paid to the operating conditions that are often used during normal driving, that is, the operating conditions to which the engine often operates, these operating conditions are set as characteristic conditions, and the characteristic condition parameter of the calibration machine is stored in advance, so that when the engine operates to the characteristic condition, that is, when the characteristic condition parameter of the engine is the same as the characteristic condition parameter of the calibration machine that is stored in advance, the scheme of the embodiment of the present invention may be performed. Therefore, in this embodiment, the operating condition is specifically a characteristic operating condition, and the characteristic operating condition is an operating condition with a high occurrence frequency in the operating process of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition. For example, the characteristic operating condition may be a low-load urban operating condition in which the rotation speed is 2000rpm, the throttle opening is 10, and the intake and exhaust valve timings are all 0, or an idle operating condition in which the rotation speed is 750rpm, the throttle opening is 10, the intake valve timing is 20, and the exhaust valve timing is-15, or the like.
Step 202: and obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine.
It should be noted that step 202 is to calculate the difference between the intake pipe pressure between the engine and the calibration engine, and this pressure difference can be directly used as the target correction term in the following step 203, and the charging efficiency calculated based on the calibration engine is directly corrected.
Step 203: and determining a target correction term according to the first air inlet pipe pressure difference.
It should be noted that the operating condition parameter may also have a certain influence on the pressure difference of the first intake pipe, and therefore, the pressure difference of the first intake pipe may also be corrected based on the operating condition parameter, so as to obtain a more accurate target correction term in a simpler and more convenient manner, and further obtain an inflation efficiency closer to the actual inflation efficiency of the engine based on the target correction term. Generally, the pressure difference of the first air inlet pipe is corrected based on the working condition parameters, and the following two implementation modes can be adopted for determining the target correction term:
the first method is that according to the measured data of the engine in actual operation, for the same engine, different throttle openings are found, the pressure difference of a first air inlet pipe obtained according to the pressure of the air inlet pipe of the engine and the pressure of the air inlet pipe of the calibration machine is also different, in order to facilitate the calculation of the subsequent inflation efficiency, the obtained pressure difference of the first air inlet pipe is mapped into a certain specific value, and the specific value is used as a target correction term and substituted into an inflation efficiency calculation formula. Specifically, step 201 may include, for example: acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation; the second intake pipe pressure difference is determined as the target correction term.
For example, under the same operation condition that the rotating speed is 2000rpm, the timing of the intake valve and the exhaust valve is equal to 10, and the opening degree of a throttle valve is 10, the obtained first intake pipe pressure difference is 50 hPa; the method comprises the steps of obtaining a first air inlet pipe pressure difference of 30hPa through a throttle opening of 20, checking a correction table corresponding to the first air inlet pipe pressure difference to obtain a second air inlet pipe pressure difference 35hPa corresponding to the first air inlet pipe pressure difference in order to guarantee global accuracy, determining the second air inlet pipe pressure difference 35hPa as a target correction term, and substituting the target correction term into an inflation efficiency calculation formula to calculate inflation efficiency.
The second is that the engine has different sensibility to the intake pipe pressure difference, i.e. the intake resistance difference, under different rotational speed loads and different intake and exhaust valve timings, so the second intake pipe pressure difference can be continuously corrected according to the rotational speed, load, intake and exhaust valve timing and other parameters corresponding to the operation condition, wherein the load can be parameters such as the accelerator opening degree. Specifically, step 201 may include, for example: acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation; obtaining a correction coefficient according to the operating condition parameters and correction tables in a correction table set corresponding to the operating condition parameters, wherein the correction tables in the correction table set are preset according to measured data of two engines with deviation in actual operation; obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient; determining the third intake pipe pressure difference as the target correction term.
In practical applications, it may be selected to obtain a correction coefficient to correct the second intake pipe pressure difference according to a correction table of the rotation speed and the load and the corresponding rotation speed and the load, or to obtain a correction coefficient to correct the second intake pipe pressure difference according to a correction table of the rotation speed and the intake valve timing and the corresponding rotation speed and the intake valve timing; the mode of a correction table according to the rotating speed and the exhaust valve timing and the corresponding rotating speed and the exhaust valve timing can be selected, and a correction coefficient is obtained to correct the pressure difference of the second air inlet pipe; it is of course also possible to obtain correction factors for correcting the second intake pipe pressure difference according to any two or three of the three ways described above. Therefore, in the present embodiment, the set of correction tables includes one or more of a correction table corresponding to a rotation speed and a load, a correction table corresponding to a rotation speed and an intake valve timing, and a correction table corresponding to a rotation speed and an exhaust valve timing.
For example, the coefficient a is obtained from a correction table of the rotation speed and the load and the corresponding rotation speed and the load; obtaining a coefficient b according to the correction table of the rotating speed and the intake valve timing and the corresponding rotating speed and the intake valve timing; obtaining a coefficient c according to the correction table of the rotating speed and the exhaust valve timing and the corresponding rotating speed and the exhaust valve timing; and calculating according to the a, the b and the c to obtain a correction coefficient.
Step 204: and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas.
It should be noted that the preset calculation formula of the inflation efficiency derived from a plurality of complex empirical formulas may be:
φc＝k×(pⅡ-pegr+m)；
where Φ c is the inflation efficiency; p is a radical ofⅡCalibrating the pressure of an air inlet manifold of the machine; m is a target correction term; k and pegrAre calculated by a series of complex empirical formulas. In particular, the rootThe process of deriving the preset inflation efficiency calculation formula according to a plurality of complex empirical formulas is as follows:
by definition of the inflation efficiency:
wherein m is1Mass of fresh air actually sucked into an engine cylinder in each working cycle of the internal combustion engine; m isshThe theoretical air mass which is full of the working volume of the cylinder in the state of an air inlet channel in each working cycle of the internal combustion engine;
when the air inlet valve is closed, the total mass of the gas in the cylinder is maFrom fresh charge m drawn into the cylinder per cycle1And the mass m of the residual waste gas in the previous circulation cylinderegr’The pressure is as follows: paIs equal to pⅡ. Therefore:
ms＝m1+megr’
from the equation of state of the ideal gas:
thus:
due to Pa＝pⅡSo the above formula can be internalised into the following form.
φc＝k×(pⅡ-pegr+m)
Through various implementation manners provided by the embodiment, the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibrating machine under the same operation condition parameters are obtained, wherein the calibrating machine is used for calibrating the engine; obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; determining a target correction term according to the first air inlet pipe pressure difference; and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas. Therefore, a correction term can be obtained according to the difference between the pressures of the air inlet pipes of the engine and the calibration machine, the original inflation efficiency calculation formula of the calibration machine is corrected by the correction term, more accurate inflation efficiency of the engine is obtained, and the problems that the inflation efficiency calculated by the calibration machine is the same but the actual inflation efficiency is different between different engines of the same type under the same working condition are solved.
Exemplary device
Referring to fig. 4, a schematic diagram of a device for modifying inflation efficiency according to an embodiment of the present invention is shown. In this embodiment, the apparatus may specifically include:
an intake pipe pressure obtaining unit 401, configured to obtain an intake pipe pressure of the engine and an intake pipe pressure of a calibration machine under the same operating condition parameter, where the calibration machine is an engine configured to calibrate the engine;
a first intake pipe pressure difference obtaining unit 402, configured to obtain a first intake pipe pressure difference according to an intake pipe pressure of the engine and an intake pipe pressure of the calibration engine;
a target correction term determination unit 403 for determining a target correction term based on the first intake pipe pressure difference;
and an inflation efficiency obtaining unit 404, configured to obtain the inflation efficiency of the engine after correction according to the target correction term and a preset inflation efficiency calculation formula.
Optionally, the operating condition is specifically a characteristic operating condition, and the characteristic operating condition is an operating condition with high occurrence frequency in the operating process of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition.
Optionally, the target correction term determining unit 403 specifically includes a second intake pipe pressure difference obtaining subunit and a target correction term determining subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the target correction term determination subunit is configured to determine the second intake pipe pressure difference as the target correction term.
Optionally, the target correction term determining unit 403 specifically includes a second intake pipe pressure difference obtaining subunit, a correction coefficient obtaining subunit, a third intake pipe pressure difference obtaining subunit, and a target correction term determining subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the correction coefficient obtaining subunit is configured to obtain a correction coefficient according to the operating condition parameter and a correction table in a correction table set corresponding to the operating condition parameter, where the correction table in the correction table set is preset according to measurement data of two engines with deviation in actual operation;
the third air inlet pipe pressure difference obtaining subunit is used for obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient;
the target correction term determination subunit is configured to determine the third intake pipe pressure difference as the target correction term.
Optionally, the set of correction tables includes one or more of a correction table corresponding to speed and load, a correction table corresponding to speed and intake valve timing, and a correction table corresponding to speed and exhaust valve timing.
Through various implementation manners provided by the embodiment, the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibrating machine under the same operation condition parameters are obtained, wherein the calibrating machine is used for calibrating the engine; obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine; determining a target correction term according to the first air inlet pipe pressure difference; and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas. Therefore, a correction term can be obtained according to the difference between the pressures of the air inlet pipes of the engine and the calibration machine, the original inflation efficiency calculation formula of the calibration machine is corrected by the correction term, more accurate inflation efficiency of the engine is obtained, and the problems that the inflation efficiency calculated by the calibration machine is the same but the actual inflation efficiency is different between different engines of the same type under the same working condition are solved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of another element in the same process, method, article, or apparatus that comprises the element.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A method of modifying charging efficiency, comprising:
acquiring the pressure of an air inlet pipe of the engine and the pressure of an air inlet pipe of a calibrating machine under the same operating condition parameters, wherein the calibrating machine is used for calibrating and calibrating the engine;
obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine;
determining a target correction term according to the first air inlet pipe pressure difference;
and obtaining the corrected inflation efficiency of the engine according to the target correction term and a preset inflation efficiency calculation formula, wherein the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas.
2. The method according to claim 1, characterized in that the operating condition is in particular a characteristic operating condition, which is an operating condition that occurs frequently during operation of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition.
3. The method according to claim 1, wherein determining a target correction term based on the first intake pipe pressure difference comprises:
acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation;
the second intake pipe pressure difference is determined as the target correction term.
4. The method according to claim 1, wherein determining a target correction term based on the first intake pipe pressure difference comprises:
acquiring a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, wherein the correction table is preset according to measured data of two engines with deviation in actual operation;
obtaining a correction coefficient according to the operating condition parameters and correction tables in a correction table set corresponding to the operating condition parameters, wherein the correction tables in the correction table set are preset according to measured data of two engines with deviation in actual operation;
obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient;
determining the third intake pipe pressure difference as the target correction term.
5. The method of claim 4, wherein the set of correction tables includes one or more of a correction table corresponding to speed and load, a correction table corresponding to speed and intake valve timing, and a correction table corresponding to speed and exhaust valve timing.
6. An apparatus for modifying an inflation efficiency, comprising:
the system comprises an air inlet pipe pressure acquisition unit, a calibration unit and a control unit, wherein the air inlet pipe pressure acquisition unit is used for acquiring the air inlet pipe pressure of an engine and the air inlet pipe pressure of a calibration machine under the same operating condition parameters, and the calibration machine is used for calibrating the engine;
the first air inlet pipe pressure difference obtaining unit is used for obtaining a first air inlet pipe pressure difference according to the air inlet pipe pressure of the engine and the air inlet pipe pressure of the calibration machine;
the target correction term determining unit is used for determining a target correction term according to the first air inlet pipe pressure difference;
and the inflation efficiency obtaining unit is used for obtaining the inflation efficiency of the engine after correction according to the target correction term and a preset inflation efficiency calculation formula, and the preset inflation efficiency calculation formula is obtained by derivation according to a plurality of complex empirical formulas.
7. The device according to claim 6, wherein the operating condition is specifically a characteristic operating condition, and the characteristic operating condition is an operating condition with high occurrence frequency in the operation process of the engine; the operating condition parameters include a rotational speed of the engine, a throttle opening, an intake valve timing, and an exhaust valve timing under the operating condition.
8. The apparatus according to claim 6, wherein the target correction term determination unit specifically includes a second intake pipe pressure difference obtaining subunit and a target correction term determination subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the target correction term determination subunit is configured to determine the second intake pipe pressure difference as the target correction term.
9. The apparatus according to claim 6, wherein the target correction term determination unit specifically includes a second intake pipe pressure difference obtaining subunit, a correction coefficient obtaining subunit, a third intake pipe pressure difference obtaining subunit, and a target correction term determination subunit;
the second air inlet pipe pressure difference obtaining subunit is used for obtaining a second air inlet pipe pressure difference according to the first air inlet pipe pressure difference and a correction table corresponding to the first air inlet pipe pressure difference, and the correction table is preset according to measurement data of two deviated engines in actual operation;
the correction coefficient obtaining subunit is configured to obtain a correction coefficient according to the operating condition parameter and a correction table in a correction table set corresponding to the operating condition parameter, where the correction table in the correction table set is preset according to measurement data of two engines with deviation in actual operation;
the third air inlet pipe pressure difference obtaining subunit is used for obtaining a third air inlet pipe pressure difference according to the second air inlet pipe pressure difference and the correction coefficient;
the target correction term determination subunit is configured to determine the third intake pipe pressure difference as the target correction term.
10. The apparatus of claim 9, wherein the set of correction tables includes one or more of a correction table corresponding to speed and load, a correction table corresponding to speed and intake valve timing, and a correction table corresponding to speed and exhaust valve timing.
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| CN110469416A (en) * | 2019-09-29 | 2019-11-19 | 潍柴动力股份有限公司 | A kind of engine control, control device and engine |
| CN110671218B (en) * | 2019-09-30 | 2022-04-26 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN112765750B (en) * | 2021-01-27 | 2024-02-13 | 昆山乙盛机械工业有限公司 | Cylindrical core packing force calculation method, system and server |
| CN113153543B (en) * | 2021-03-18 | 2023-01-03 | 联合汽车电子有限公司 | Air intake load model correction method and vehicle |
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