CN115788695B - Engine air inflow determining method and device, vehicle and medium - Google Patents
Engine air inflow determining method and device, vehicle and mediumInfo
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- CN115788695B CN115788695B CN202211297867.9A CN202211297867A CN115788695B CN 115788695 B CN115788695 B CN 115788695B CN 202211297867 A CN202211297867 A CN 202211297867A CN 115788695 B CN115788695 B CN 115788695B
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Abstract
本发明公开了一种发动机进气量的确定方法、装置、车辆及介质。该方法包括：获取发动机的进气歧管的当前压力值及进气道中调节机构的当前位置信息；根据当前压力值及当前位置信息，确定发动机的当前效率状态；根据当前效率状态及当前效率进气关联信息，确定发动机的当前进气量。本发明利用压力值及可变进气道中调节机构的位置信息及动作情况对当前效率状态进行预估，保证了进气状态的准确判断，进而使确定出的当前效率状态更接近实际状态，使得通过当前效率状态确定的当前进气量更加准确。可以快速、准确地确定不同进气道状态下进气量，同时不用对原有的固定进气道状态下的确定方法进行大量修改，增加了进气量确定方法的通用性。
The present invention discloses a method, device, vehicle and medium for determining the intake volume of an engine. The method comprises: obtaining the current pressure value of the intake manifold of the engine and the current position information of the regulating mechanism in the intake duct; determining the current efficiency state of the engine based on the current pressure value and the current position information; and determining the current intake volume of the engine based on the current efficiency state and the current efficiency-intake related information. The present invention uses the pressure value and the position information and the action status of the regulating mechanism in the variable intake duct to estimate the current efficiency state, thereby ensuring an accurate judgment of the intake state, thereby making the determined current efficiency state closer to the actual state, and making the current intake volume determined by the current efficiency state more accurate. The intake volume under different intake duct states can be determined quickly and accurately, without having to make extensive modifications to the original determination method under the fixed intake duct state, thereby increasing the versatility of the intake volume determination method.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for determining air inflow of an engine, a vehicle and a medium.
Background
The accurate calculation of the air inflow of the engine is the basis of accurate ignition, oil injection control and torque calculation, whether the control and calculation are accurate or not directly influences the emission and the drivability of the engine, and when the operation condition of the engine changes, the corresponding rapid and accurate air inflow calculation method directly influences the emission and the drivability of the engine.
In the prior art, the pressure ratio of the supercharger behind the air inlet flow sensor and the air inlet flow which is acquired at present can be acquired, the maximum reference air inlet flow is determined according to at least one air inlet flow which is acquired adjacently, and the air inlet flow is corrected by utilizing the maximum reference air inlet flow. In the method for calculating the air intake flow, the air intake flow coefficient is not used, the air intake quantity of the engine can be directly influenced by the change of the air intake flow coefficient of the engine, if the air intake quantity can not be calculated as soon as possible after being changed, the calculation of control parameters such as oil injection of the engine can deviate, the control such as the air-fuel ratio deviates, and the emission is poor.
Disclosure of Invention
The invention provides a method, a device, a vehicle and a medium for determining the air inflow of an engine so as to accurately determine the air inflow of a variable air passage of the engine.
According to a first aspect of the present invention, there is provided a method of determining an engine intake air amount, comprising:
Acquiring the current pressure value of an air inlet manifold of an engine and the current position information of an adjusting mechanism in an air inlet channel;
determining a current efficiency state of the engine according to the current pressure value and the current position information;
and determining the current air inflow of the engine according to the current efficiency state and the current efficiency air inflow related information.
According to a second aspect of the present invention, there is provided an engine intake air amount determining apparatus comprising:
the information acquisition module is used for acquiring the current pressure value of an air inlet manifold of the engine and the current position information of the regulating mechanism in the air inlet channel;
the state determining module is used for determining the current efficiency state of the engine according to the current pressure value and the current position information;
And the air inflow determining module is used for determining the current air inflow of the engine according to the current efficiency state and the current efficiency air inflow related information.
According to a third aspect of the present invention, there is provided a vehicle comprising:
At least one controller, and
A memory communicatively coupled to the at least one controller, wherein,
The memory stores a computer program executable by the at least one controller to enable the at least one controller to perform the method of determining the engine intake air amount according to any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a controller to execute a method of determining an engine intake air amount according to any one of the embodiments of the present invention.
According to the technical scheme, the current pressure value of the air inlet manifold of the engine and the current position information of the adjusting mechanism in the air inlet channel are obtained, the current efficiency state of the engine is determined according to the current pressure value and the current position information, and the current air inflow of the engine is determined according to the current efficiency state and the current efficiency air inflow related information. The invention predicts the current efficiency state by utilizing the pressure value and the position information and the action condition of the regulating mechanism in the variable air inlet channel, ensures the accurate judgment of the air inlet state, further ensures that the determined current efficiency state is closer to the actual state, and ensures that the current air inlet amount determined by the current efficiency state is more accurate. The method can quickly and accurately determine the air inflow under different air inlet states, and meanwhile, the original determination method under the fixed air inlet state is not required to be modified greatly, so that the universality of the air inflow determination method is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method of determining an engine intake air amount according to a first embodiment of the invention;
Fig. 2 is a flowchart of a method of determining an engine intake air amount according to a first embodiment of the invention;
fig. 3 is a schematic structural view of an engine intake air amount determining apparatus provided according to a third embodiment of the present invention;
fig. 4 is a schematic structural view of a vehicle embodying an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for determining an intake air amount of an engine according to an embodiment of the present invention, which is applicable to a case of determining an intake air amount of a variable intake passage of an engine, and the method may be performed by an engine intake air amount determining device that may be implemented in hardware and/or software, and the engine intake air amount determining device may be configured in a vehicle. As shown in fig. 1, the method includes:
s110, acquiring the current pressure value of an intake manifold of the engine and the current position information of an adjusting mechanism in an air inlet passage.
In this embodiment, the engine is understood to mean a variable intake engine by taking fresh air necessary for the work done by combustion and discharging the burnt exhaust gases. The intake manifold is understood to be the conduit through which fresh air needs to pass to enter the different cylinders. The adjusting mechanism in the air inlet channel can be understood as an air inlet flap which can be controlled in the air inlet channel. The current position information can be understood as position information of the intake flap in the adjusting mechanism.
It is known that the general structure of the variable intake duct engine is that an air duct structure changing device is arranged in a main air duct, the device can be composed of an air duct partition plate, an adjustable partition plate, an adjusting mechanism and a control mechanism, the mechanical relationship is that the control mechanism adjusts the air duct structure through an actuating mechanism, the change of the air duct structure can cause the change of the air charging efficiency and the tumble ratio of the gas in a cylinder, and the position of the adjusting mechanism can reflect the state of the air charging to the air charging efficiency and the tumble ratio and is collected. The air inlet cross section area is reduced by combining with the special design of the piston top, so that air-gas mixing is facilitated, the air charging efficiency of the engine can be increased at the moment, and the air charging efficiency of the engine is different when the air inlet turning plate is positioned at different positions.
Specifically, the pressure value of the intake manifold can be acquired through a corresponding sensor, and the controller can acquire the pressure value acquired by the sensor as the current pressure value. The current position information of the adjusting mechanism in the air inlet channel, namely the position information of the air inlet turning plate, can be determined through the corresponding sensor.
S120, determining the current efficiency state of the engine according to the current pressure value and the current position information.
In the present embodiment, the current efficiency state may be understood as a state of relationship between the charge gas efficiency of the engine and the characteristic point charge gas efficiency.
It should be appreciated that, each time the determined engine intake air amount may be different from the actually introduced intake air amount, if the determination of the intake air amount is performed according to the same efficiency state, the intake air amount may be inaccurate, which may further result in the inaccuracy of the actual intake air amount.
Specifically, the change trend of the air input can be judged according to the difference between the historically determined air input and the historically actual air input, the change trend and the change amount of the air input from the current moment to the closing moment of the air inlet valve can be estimated by utilizing the pressure change speed and the throttle valve change speed, the pressure change condition of the air inlet manifold at the closing moment of the air inlet valve can be estimated and calculated according to the change trend and the change amount of the air input, and the air input at the closing moment of the air inlet valve can be estimated by combining the current pressure value and the pressure change condition estimated according to the change trend and the change amount of the air input. According to the current position information of the regulating mechanism in the air inlet channel, the average state of the position of the regulating mechanism in the air inlet process can be estimated. According to the estimated average state of the air inflow at the closing time of the air inlet valve and the position of the regulating mechanism and the rotating speed of the engine, the charging efficiency state of the engine can be calculated preliminarily, and the current efficiency state of the engine is determined by correcting the charging efficiency state according to the last time of the combustion in the engine cylinder because each machine is different and the position change of the regulating mechanism can cause the change of the combustion condition in the engine cylinder and further the change of the charging efficiency state.
S130, determining the current air inflow of the engine according to the current efficiency state and the current efficiency air inflow related information.
In the present embodiment, the current efficiency intake air related information may be understood as a conversion relation of the efficiency state and the intake air amount. The current intake air amount may be understood as the amount of air that the engine has taken in.
Specifically, the two characteristic inflation states and the corresponding air inflow thereof can be calibrated according to the current operation condition of the engine, the opening and closing time states of the air inlet valve and the air outlet valve, the air inlet temperature and the air outlet pressure and other parameters, so that the current efficiency air inlet related information is determined according to the two characteristic inflation states and the corresponding air inflow thereof. The controller may search in the current efficiency air intake related information according to the current efficiency state, and determine an air intake amount corresponding to the current efficiency state as the current air intake amount.
According to the technical scheme, the current pressure value of the air inlet manifold of the engine and the current position information of the adjusting mechanism in the air inlet channel are obtained, the current efficiency state of the engine is determined according to the current pressure value and the current position information, and the current air inflow of the engine is determined according to the current efficiency state and the current efficiency air inflow related information. The invention predicts the current efficiency state by utilizing the pressure value and the position information and the action condition of the regulating mechanism in the variable air inlet channel, ensures the accurate judgment of the air inlet state, further ensures that the determined current efficiency state is closer to the actual state, and ensures that the current air inlet amount determined by the current efficiency state is more accurate. The method can quickly and accurately determine the air inflow under different air inlet states, and meanwhile, the original determination method under the fixed air inlet state is not required to be modified greatly, so that the universality of the air inflow determination method is improved.
As a first optional embodiment of the first embodiment, after determining the current intake air amount of the engine according to the current efficiency state and the current association information of the efficiency state and the intake air amount on the basis of the above embodiments, further optimization may include:
and determining the current air inlet related information of the engine based on the current throttle opening value and the current position information acquired by the sensor at the current moment.
In the present embodiment, the current throttle opening value may be understood as converting the opening degree of the throttle valve into a numerical representation. The current intake-related information may be understood as information that characterizes a change in a related value of the engine during intake.
Specifically, the opening value of the throttle valve acquired at the current moment by the corresponding sensor can be acquired as the current opening value of the throttle valve, the current position information of the regulating mechanism in the air inlet channel acquired at the current moment by the corresponding sensor is acquired, and the current air inlet related information of the engine is determined by combining the information stored in the corresponding unit.
Further, the step of determining current air intake related information of the engine based on the current actual air intake, the current throttle opening value and the current position information acquired by the sensor at the current time may specifically include:
a1, determining current change rate parameter information based on the current throttle opening value and the current position information.
In this embodiment, the current change rate parameter information may be understood as information characterizing the change trend of different parameters.
Specifically, the current throttle opening value may be combined with the historical throttle opening value stored in the corresponding unit to calculate the throttle change rate of the throttle opening, the current position information may be combined with the historical position information stored in the corresponding unit to calculate the position change rate of the adjusting mechanism, and the throttle change rate and the position change rate are determined as the throttle change rate parameter information.
B1, determining current air input information based on the current air input and the acquired current target air input.
In the present embodiment, the current target intake air amount may be understood as an estimated amount of intake air required by the engine at the current time.
Specifically, the estimated current target intake air amount may be stored to a corresponding position, the stored current target intake air amount may be obtained, and the determined current intake air amount and the current target intake air amount are used as current intake air amount information.
C1, composing the current change rate parameter information, the current air inflow information and the obtained current knock information into current air inflow related information.
In the present embodiment, the current knock information may be understood as a knock condition generated by combustion in an engine cylinder.
Specifically, current knock information may be obtained through a corresponding sensor, and the current change rate parameter information, the current intake air amount information, and the current knock information are used as current intake air related information. And the current air inlet related information is stored to the corresponding position, so that the use of the current air inlet is convenient to determine later.
According to the first optional embodiment of the first embodiment, the information currently collected by different sensors is stored, so that the subsequent determination of the variable quantity according to the information collected by the sensors at different collection moments is facilitated, and a reference foundation is provided for the subsequent correction of the efficiency state.
Example two
Fig. 2 is a flowchart of a method for determining an intake air amount of an engine according to a second embodiment of the present invention, which is further optimized on the basis of the above embodiment, as shown in fig. 2, and includes:
s210, acquiring the current pressure value of an intake manifold of the engine and the current position information of an adjusting mechanism in an air inlet passage.
S220, acquiring historical air intake related information of the engine, wherein the historical air intake related information comprises historical air intake information, historical change rate parameter information and historical knocking information.
Specifically, the method can search in the corresponding storage position to obtain the stored historical air intake related information of the engine, and obtain the historical air intake information, the historical change rate parameter information and the historical knocking information.
S230, estimating a target pressure value of the intake manifold at the closing moment of the intake valve according to the current pressure value, the historical air inflow information and the historical change rate parameter information.
In the present embodiment, the target pressure value may be understood as a pressure value reached by the intake manifold at the closing timing.
Specifically, the current pressure value obtained through actual measurement can be used as a basis, the air inflow deviation value under the historical condition can be determined by combining the historical air inflow information, and the target pressure value of the intake manifold at the closing moment of the intake valve can be estimated through a preset calculation method according to the current pressure value, the air inflow deviation value and the historical change rate parameter information.
Further, the step of estimating the target pressure value of the intake manifold at the closing time of the intake valve according to the current pressure value, the historical intake air amount information and the historical change rate parameter information may specifically include:
a2, determining a prediction coefficient according to the deviation value of the historical air input and the historical target air input in the historical air input information.
In the present embodiment, the pre-estimated coefficient may be understood as a coefficient for characterizing the deviation of the intake air amount.
Specifically, the historical air inflow and the historical target air inflow can be subjected to air inflow difference value calculation, the air inflow difference value is combined with the rotating speed of the current engine, and the air inflow difference value and the corresponding estimated coefficient under the rotating speed of the current engine are searched in the estimated coefficient table.
And b2, estimating a target pressure value according to the estimated coefficient and the historical change rate parameter information.
Specifically, the throttle change rate corresponding to the throttle opening at the current collection time and the last collection time can be obtained from the historical change rate parameter information, the pressure value of the intake manifold at the current collection time and the last collection time is obtained, the pressure change rate is further obtained, and according to the data of the last collection time in the historical intake related information, the crank angle corresponding to the intake valve at the current collection time and the last collection time interval and the crank angle from the current collection time to the closing time of the intake valve can be determined. A predetermined pressure portion coefficient of action may be obtained. The target pressure value of the intake manifold at the closing time of the intake valve can be estimated according to the corresponding relation among the estimated coefficient, the pressure change rate obtained by calculating the current pressure value and the historical pressure value, the crank angle at different times, the current throttle opening and the throttle opening change rate determined by the throttle opening at the previous time.
For example, the target pressure value P of the intake manifold at the estimated intake valve closing time may be determined using the following equation:
MAP (M Target object -M Actual practice is that of , SPEED) represents an estimated coefficient determined according to the difference value between the target air inflow M Target object and the air inflow M and the rotating SPEED SPEED, P n is a current pressure value of an air inlet manifold, P n-1 is a historical pressure value of the air inlet manifold at the last acquisition time, A p is a crank angle between the current acquisition time and the last acquisition time, A d is a crank angle between the current acquisition time and the closing time of an air inlet valve, A n is a current throttle opening, A n-1 is a throttle opening at the last acquisition time, and f is a pressure part acting coefficient.
S240, estimating average position information of an adjusting mechanism of the air inlet channel in the air inlet process according to the current position information.
Specifically, the stored historical position information can be acquired from a unit (such as an electronic control unit) for storing corresponding information, the information of the acquisition point at the last acquisition time can be acquired between the acquisition points corresponding to the throttle valve at different acquisition times, and the angle between the current time and the acquisition point corresponding to the last acquisition time is determined. Because the opening point and the closing point of the air inlet valve are fixed position points, the angle between the opening point and the closing point of the air inlet valve can be determined, wherein the air inlet valve is opened only when the air inlet function of the engine is performed, so that gas enters the engine, and the gas can be prevented from leaking when the air inlet valve is compressed. The closing point of the throttle valve is a fixed position point, wherein the throttle valve can be used for controlling the pressure of the manifold, the angle between the current collecting point and the closing point of the throttle valve can be determined, and the average position information of the regulating mechanism of the air inlet channel in the air inlet process can be estimated according to the relation among the current position information, the historical position information of the last collecting moment, the angle between the opening point and the closing point and the angle between the current collecting point and the closing point of the air inlet valve.
For example, the average position information S of the adjusting mechanism of the air intake passage during the air intake process may be estimated according to the following formula:
Wherein S n is the current position information of the adjusting mechanism, S n-1 is the position information of the adjusting mechanism at the last acquisition time, W is the angle between the current time and the acquisition point corresponding to the last acquisition time,
V is the angle between the opening point and the closing point of the air inlet valve, and U is the angle between the current collecting point and the closing point of the air throttle valve.
S250, determining the current efficiency state according to the target pressure value, the average position information and the historical knocking information.
In the present embodiment, the current efficiency state may be understood as a relationship state for representing a relationship between intake efficiency and characteristic point charging efficiency.
Specifically, an uncorrected efficiency state may be determined according to the target pressure value and the average position information, a deviation value of the efficiency state may be determined according to the historical knock information, the efficiency state may be corrected according to the deviation value, and a current efficiency information state may be determined.
Further, the specific step of determining the current efficiency state according to the target pressure value, the average position information and the historical knock information may include:
a3, determining the efficiency average state of the engine according to the target pressure value and the average position information.
In the present embodiment, the efficiency average state can be understood as an unmodified efficiency state.
For example, the average state of efficiency T z of the engine may be determined by the following formula.
Tz=MAP(SPEED,P)*MAP(SPEED,S)
Wherein MAP (SPEED, P) represents a value determined from the engine SPEED SPEED and the target pressure value P, and MAP (SPEED, S) represents a value determined from the engine SPEED SPEED and the average position state.
B3, determining a correction value of the efficiency average state according to the historical knocking information.
In the present embodiment, the correction value may be understood as a correction value corresponding to a deviation in the efficiency state caused by the historical knock information.
It should be appreciated that, for a change in the state of the intake passage of the engine, the change in the charge efficiency and the change in the intake tumble ratio are opposite, i.e., a change in the intake passage causes the charge efficiency to increase while the tumble ratio of the intake air decreases, and vice versa. Under the same conditions, knocking is more likely to occur when the tumble ratio is lower in the engine cylinder during combustion, knocking is generated when the ignition angle is unreasonably calculated due to the fact that the tumble ratio is calculated to be larger for the engine with the variable air inlet channel, and then the charging efficiency can be corrected according to the knocking condition.
Specifically, the stored last several times of historical knock information can be obtained, and whether the calculation of the in-cylinder intake tumble ratio (related to the charging efficiency) state is deviated or not is judged according to the historical knock information, namely if the engine knocks obviously, the fact that the calculation of the in-cylinder tumble ratio state is higher, namely the calculation of the charging efficiency state is lower is indicated, and the charging efficiency state needs to be greatly corrected on the basis of the efficiency average state obtained by preliminary calculation, and vice versa, so that the final charging efficiency state is obtained. Different correction values can be set according to different historical knock information, a correlation table of the correction values and the correlation table can be established, and the correction value of the efficiency average state corresponding to the historical knock information can be determined according to the correlation table.
And c3, correcting the efficiency average state based on the correction value to obtain the current efficiency state.
Specifically, when the historical knock information shows that the engine knock is obvious, a correction value corresponding to the historical knock information can be determined according to the association table, and the correction value is added with the efficiency average state to obtain the current efficiency state. When the historical knock information shows that the engine knock is not obvious, a correction value corresponding to the historical knock information can be determined according to the association table, and the correction value is subtracted from the average efficiency state to obtain the current efficiency state.
S260, acquiring current operation parameter information of the engine.
In the present embodiment, the current operation parameter information may be understood as parameter information that changes when the engine is operated.
Specifically, engine operation condition information, such as information of rotation speed and the like, can be obtained through corresponding sensors, VVT opening information corresponding to opening and closing moments of an air inlet valve and an air outlet valve is obtained, and information of temperature, pressure and the like during air inlet and air outlet is obtained.
S270, determining current efficiency air inlet associated information according to the current operation parameter information.
Specifically, a basic inflation model can be obtained, the basic inflation model is corrected through current operation parameter information, the corrected basic inflation model is determined, two characteristic points can be determined according to the corrected basic inflation model, and current efficiency air inlet correlation information among the characteristic points can be determined according to the characteristic points and the corresponding air inflow.
Further, the specific step of determining the current efficiency air intake related information according to the current operation parameter information may include:
a4, determining a current basic inflation model based on the current operation parameter information.
The partial pressure value of fresh air in the cylinder after the valve is closed can be determined through calibration parameters according to the current operation parameter information such as the current pressure value, the VVT opening information and the like, and a corrected basic inflation model can be formed according to the partial pressure value, the gas constant, the temperature value, the gas volume and the air inflow to be used as the current basic inflation model.
And b4, determining the current inflation characteristic points in the current basic inflation model according to the current basic inflation model.
In this embodiment, the current inflation characteristic point may be understood as an inflection point existing in the selected current basic inflation model, such as a point with the lowest efficiency state and a point with the highest efficiency state.
Specifically, the current basic inflation model may be in a curve form, and an inflection point in the curve may be determined as a current inflation characteristic point. And taking the lowest efficiency point and the highest efficiency point as the current inflation characteristic points.
C4, determining current efficiency air inlet associated information according to the current air charging characteristic points
Specifically, according to the current inflation characteristic points, the air inflow corresponding to the current inflation characteristic points can be determined in the model, and then the corresponding relation between the current efficiency state and the air inflow, which is included between the current inflation characteristic points, can be determined, and the corresponding relation is determined as the current efficiency air inflow association information.
S280, determining the current air inflow matched with the current efficiency state based on the current efficiency air inflow related information.
Specifically, the current air inflow matched with the current efficiency state can be determined by searching in the current efficiency air inflow related information.
According to the technical scheme, the air inflow at the closing time of the air inlet valve is calculated through pressure estimation of the manifold, accurate judgment of the air inflow state is ensured, the air inflow change trend is judged through the difference state of the target air inflow and the actual air inflow, the amount of change from the current time to the closing time of the air inlet valve is estimated through the pressure and the change speed of the throttle valve, and the air inflow at the closing time of the air inlet valve is calculated through the current pressure value, the air inflow change trend and the change amount estimation of the air quantity. And estimating the efficiency average state according to the operation condition of the engine, the position of the variable air inlet channel state executing mechanism and the action condition, so that the efficiency average state is closer to the actual state. The correction amount of the average efficiency state is determined by utilizing the knocking condition caused by the ignition angle output, so that the current efficiency state is determined, the air input is calculated more accurately by a machine with variable charging efficiency, and the adaptability is higher. And finally, determining a current basic inflation model according to the current operation parameters of the engine, so as to determine two inflation characteristic points and corresponding current efficiency recent associated information, and determining the air inflow by combining the current inflation efficiency state. By establishing the association relation between the vibration and explosion information and the correction quantity, the dynamic correction of the efficiency state is realized, the applicability of the method is enhanced, the accurate determination of the air inflow under different air inlet channel states is realized, the rapid determination and the dynamic correction of the air inflow in the air inlet channel state change process are realized, and the accuracy of the air inflow determination is ensured.
Example III
Fig. 3 is a schematic structural diagram of an engine intake air amount determining apparatus according to a third embodiment of the present invention. As shown in fig. 3, the apparatus includes an information acquisition module 31, a state determination module 32, and an intake air amount determination module 33. Wherein, the
The information acquisition module 31 is used for acquiring the current pressure value of an intake manifold of the engine and the current position information of the regulating mechanism in the air inlet channel;
A state determination module 32 for determining a current efficiency state of the engine based on the current pressure value and the current position information;
The intake air amount determining module 33 is configured to determine a current intake air amount of the engine according to the current efficiency state and the current efficiency intake air related information.
Optionally, the state determination module 32 includes:
a first acquisition unit configured to acquire history intake related information of an engine, the history intake related information including history intake air amount information, history change rate parameter information, and history knock information;
The pressure value estimating unit is used for estimating a target pressure value of the intake manifold at the closing time of the intake valve according to the current pressure value, the historical air inflow information and the historical change rate parameter information;
the information estimating unit is used for estimating the average position information of the regulating mechanism of the air inlet channel in the air inlet process according to the current position information;
and the efficiency determining unit is used for determining the current efficiency state according to the target pressure value, the average position information and the historical knocking information.
Further, the pressure value estimating unit may be specifically configured to:
determining a pre-estimated coefficient according to the deviation value of the historical air input and the historical target air input in the historical air input information;
And estimating the target pressure value according to the estimated coefficient and the historical change rate parameter information.
Further, the efficiency determination unit may be specifically configured to:
Determining the efficiency average state of the engine according to the target pressure value and the average position information;
determining a correction value of the average state of efficiency according to the historical knock information;
And correcting the average efficiency state based on the correction value to obtain the current efficiency state.
Optionally, the intake air amount determination module 33 includes:
The second acquisition unit is used for acquiring the current operation parameter information of the engine;
the information determining unit is used for determining current efficiency air inlet associated information according to the current operation parameter information;
And an intake air amount determining unit configured to determine a current intake air amount that matches the current efficiency state based on the current efficiency intake air related information.
Further, the intake air amount determination unit may be specifically configured to:
Determining a current base inflation model based on the current operating parameter information;
determining current inflation characteristic points in the current basic inflation model according to the current basic inflation model;
and determining the current efficiency air inlet associated information according to the current air charging characteristic points.
Optionally, the apparatus, after the intake air amount determining module 33, may further include:
The information determining module is used for determining current air inlet related information of the engine based on the current throttle opening value and the current position information acquired by the sensor at the current moment.
Further, the information determining module may be specifically configured to:
Determining current change rate parameter information based on the current throttle opening value and the current position information;
determining current air input information based on the current air input and the acquired current target air input;
and forming the current change rate parameter information, the current air inflow information and the obtained current knock information into current air inflow related information.
The device for determining the engine air inflow provided by the embodiment of the invention can execute the method for determining the engine air inflow provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 4 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention, where, as shown in fig. 4, the vehicle includes a controller 41, a memory 42, an input device 43 and an output device 44, and the number of the controller 41 and the memory 42 may be one or more, and in fig. 4, one controller 41 and one memory 42 are taken as an example, and the controller 41 and the memory 42 in the vehicle may be connected by a bus or other means, and in fig. 4, the connection is taken as an example by a bus. The controller refers to a controller of an execution body in the embodiment of the invention.
The memory 42 is a computer-readable storage medium that stores a software program, a computer-executable program, and modules, such as program instructions/modules corresponding to the method of determining the intake air amount of the engine in the embodiment of the invention (e.g., the information acquisition module 31, the state determination module 32, the intake air amount determination module 33 in the apparatus for determining the intake air amount of the engine). The controller 41 executes various functional applications of the vehicle and data processing by running software programs, instructions, and modules stored in the memory 42, that is, implements the above-described method of determining the engine intake air amount.
The memory 42 may mainly include a storage program area that may store an operating system, application programs required for at least one function, and a storage data area that may store data created according to the use of the terminal, etc. In addition, memory 42 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 42 may further include memory remotely located relative to controller 41, which may be connected to the vehicle via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 43 may be used to receive numeric or character information and to generate key signal inputs related to vehicle user settings and function control. The output means 44 may comprise a display device.
Example five
A fifth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer microcontroller, are for performing a method of determining an engine intake air amount, the method comprising:
Acquiring the current pressure value of an air inlet manifold of an engine and the current position information of an adjusting mechanism in an air inlet channel;
determining a current efficiency state of the engine according to the current pressure value and the current position information;
and determining the current air inflow of the engine according to the current efficiency state and the current efficiency air inflow related information.
Of course, the storage medium containing the computer-executable instructions provided by the embodiment of the present invention is not limited to the method operations described above, and the related operations in the method for determining the engine intake air amount provided by any embodiment of the present invention may also be performed.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the apparatus for determining an engine intake air amount, each unit and module included are only divided according to the functional logic, but not limited to the above division, so long as the corresponding functions can be implemented, and the specific names of the functional units are only for convenience of distinguishing from each other, and are not used to limit the protection scope of the present invention.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method of determining an intake air amount of an engine, comprising:
Acquiring the current pressure value of an air inlet manifold of an engine and the current position information of an adjusting mechanism in an air inlet channel;
Determining a current efficiency state of the engine according to the current pressure value and the current position information, wherein the current efficiency state is a relation state between the gas charging efficiency and the characteristic point charging efficiency of the engine;
determining the current air inflow of the engine according to the current efficiency state and current efficiency air inflow related information, wherein the current efficiency air inflow related information is a conversion relation between the efficiency state and the air inflow;
wherein the determining the current efficiency state of the engine according to the current pressure value and the current position information includes:
acquiring historical air intake related information of the engine, wherein the historical air intake related information comprises historical air intake information, historical change rate parameter information and historical knocking information;
Estimating a target pressure value of the intake manifold at the closing time of an intake valve according to the current pressure value, the historical air inflow information and the historical change rate parameter information;
estimating average position information of the regulating mechanism of the air inlet channel in the air inlet process according to the current position information;
and determining the current efficiency state according to the target pressure value, the average position information and the historical knocking information.
2. The method of claim 1, wherein after determining the current intake air amount of the engine based on the current efficiency state and current efficiency intake air related information, further comprising:
and determining current air inlet related information of the engine based on the current throttle opening value acquired by the sensor at the current moment and the current position information.
3. The method according to claim 2, wherein the determining the current intake-related information of the engine based on the current throttle opening value and the current position information acquired by the sensor at the current time includes:
Determining current change rate parameter information based on the current throttle opening value and the current position information, wherein the current change rate parameter information is information of change trends of different parameters;
Determining current air input information based on the current air input and the acquired current target air input, wherein the current air input information comprises the current air input and the current target air input;
And constructing the current change rate parameter information, the current air inflow information and the obtained current knock information into the current air inflow related information.
4. The method of claim 1, wherein estimating the target pressure value of the intake manifold at the intake valve closing time based on the current pressure value, the historical intake air amount information, and the historical change rate parameter information comprises:
determining a pre-estimation coefficient according to the deviation value of the historical air input and the historical target air input in the historical air input information;
and estimating the target pressure value according to the estimated coefficient and the historical change rate parameter information.
5. The method of claim 1, wherein the determining the current intake air amount of the engine based on the current efficiency state and current efficiency intake air related information comprises:
Acquiring current operation parameter information of the engine;
determining the current efficiency air inlet associated information according to the current operation parameter information;
And determining the current air inflow matched with the current efficiency state based on the current efficiency air inflow related information.
6. The method of claim 5, wherein said determining said current efficiency intake air related information based on said current operating parameter information comprises:
Determining a current basic inflation model based on the current operating parameter information;
determining current inflation characteristic points in the current basic inflation model according to the current basic inflation model;
And determining the current efficiency air inlet related information according to the current air charging characteristic points.
7. An engine intake air amount determining apparatus, characterized by comprising:
the information acquisition module is used for acquiring the current pressure value of an air inlet manifold of the engine and the current position information of the regulating mechanism in the air inlet channel;
The state determining module is used for determining the current efficiency state of the engine according to the current pressure value and the current position information, wherein the current efficiency state is a relation state between the gas charging efficiency and the characteristic point charging efficiency of the engine;
The air inflow determining module is used for determining the current air inflow of the engine according to the current efficiency state and current efficiency air inflow related information, wherein the current efficiency air inflow related information is a conversion relation between the efficiency state and the air inflow;
Wherein the state determination module comprises:
a first acquisition unit configured to acquire history intake related information of an engine, the history intake related information including history intake air amount information, history change rate parameter information, and history knock information;
The pressure value estimating unit is used for estimating a target pressure value of the intake manifold at the closing time of the intake valve according to the current pressure value, the historical air inflow information and the historical change rate parameter information;
the information estimating unit is used for estimating the average position information of the regulating mechanism of the air inlet channel in the air inlet process according to the current position information;
and the efficiency determining unit is used for determining the current efficiency state according to the target pressure value, the average position information and the historical knocking information.
8. A vehicle, characterized in that the vehicle comprises:
At least one controller, and
A memory communicatively coupled to the at least one controller, wherein,
The memory stores a computer program executable by the at least one controller to enable the at least one controller to perform the method of determining the engine intake air amount of any one of claims 1-6.
9. A computer-readable storage medium storing computer instructions for causing a controller to execute the method of determining the engine intake air amount according to any one of claims 1 to 6.
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