CN114000954B

CN114000954B - Method and device for determining fresh charge in engine cylinder

Info

Publication number: CN114000954B
Application number: CN202010736571.7A
Authority: CN
Inventors: 赵伟博; 何宇; 吴中浪; 连学通; 苏庆鹏
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2023-10-03
Anticipated expiration: 2040-07-28
Also published as: CN114000954A

Abstract

The invention discloses a method and a device for determining fresh charge in an engine cylinder, wherein the method comprises the steps of determining parameters corresponding to an intake manifold; according to the parameters and a predetermined pressure calculation model, obtaining the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold; and obtaining parameters corresponding to the cylinders according to the parameters corresponding to the engine and a predetermined charge determination model, for example: fresh charge total mass in the cylinder. Therefore, by implementing the invention, the air inflow of fresh air in the engine cylinder can be accurately calculated, thereby being beneficial to reducing the combustion gas temperature of the cylinder combustion chamber, being beneficial to the fuel injection control of the engine, the accurate control of torque and air-fuel ratio, being beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas caused by insufficient fuel combustion, and being beneficial to inhibiting the knocking of the engine, so as to improve the fuel economy of the engine in the whole working condition range.

Description

Method and device for determining fresh charge in engine cylinder

Technical Field

The invention relates to the technical field of engine control, in particular to a method and a device for determining fresh charge in an engine cylinder.

Background

The low-pressure exhaust gas recirculation (LP-EGR) technology is a hot spot technology for energy conservation and emission reduction of an engine at present, and the principle of the technology is that exhaust gas generated by combustion of the engine is returned to an air intake system of the engine and participates in combustion of fuel oil in a cylinder together with fresh air. Because the exhaust gas generated by the combustion of the engine contains a large amount of three-element molecules such as carbon dioxide and water with larger specific heat capacity, when the exhaust gas is returned to the cylinder of the engine, the three-element molecules in the exhaust gas can dilute the charge in the cylinder, improve the combustion phase of fuel, reduce the temperature of the combustion gas in the combustion chamber of the cylinder, fully combust the fuel in the combustion chamber, reduce the generation of harmful gas caused by insufficient fuel combustion, inhibit the knocking of the engine, and improve the fuel economy of the engine in the whole working condition range.

For the whole engine control system, the main function of the LP-EGR is to ensure that the engine can control the amount of exhaust gas and fresh air entering the cylinder in each cycle according to the working condition requirement. In practice, the amount of intake air of fresh air into a cylinder is generally estimated by calculating the EGR rate in the cylinder of the engine. However, it has been found in practice that since the position of the low-pressure EGR system is at the end of the engine intake and exhaust system, the flow pressure difference of exhaust gas in the low-pressure EGR system pipe is small, and the pipe length of the low-pressure EGR system is long, this easily makes the calculation accuracy of the EGR rate low in the engine dynamic process, resulting in low calculation accuracy of the intake air amount of fresh air in the cylinder. Therefore, it is important to accurately calculate the amount of fresh air taken in the engine cylinder to achieve a solution that improves the fuel economy of the engine over the entire operating range.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method and a device for determining fresh charge in an engine cylinder, which can accurately calculate the air inflow of fresh air in the engine cylinder so as to improve the fuel economy of the engine in the whole working condition range.

To solve the above technical problem, a first aspect of an embodiment of the present invention discloses a method for determining a fresh charge in an engine cylinder, the method comprising:

determining parameters corresponding to an intake manifold of an engine, wherein the parameters corresponding to the intake manifold comprise an EGR rate of the intake manifold, a gas component of the intake manifold, a temperature of the intake manifold and a pressure of the intake manifold;

obtaining the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model;

obtaining a target parameter corresponding to the cylinder according to a parameter corresponding to the engine and a pre-determined charge determining model, wherein the target parameter corresponding to the cylinder at least comprises the total mass of fresh charges in the cylinder;

Wherein the parameters corresponding to the engine include parameters corresponding to the intake manifold, a closing angle of an intake valve of the engine, a closing angle of an exhaust valve of the engine, a lambda value of exhaust gas discharged from a cylinder of the engine, a pressure corresponding to an exhaust gas charge of the intake manifold, and a pressure corresponding to a fresh charge of the intake manifold.

Therefore, the first aspect of the invention can accurately calculate the air inflow of fresh air in the cylinder of the engine by determining the target parameter used for calculating the cylinder and inputting the target parameter into the charge determining model for analysis, thereby being beneficial to reducing the temperature of combustion gas in the combustion chamber of the cylinder, being beneficial to the accurate control of fuel injection control, torque and air-fuel ratio of the engine, being beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas caused by insufficient fuel combustion, and being beneficial to inhibiting the knocking of the engine, so as to realize the improvement of the fuel economy of the engine in the whole working condition range.

A second aspect of an embodiment of the present invention discloses a determination device of a fresh charge in an engine cylinder, the determination device comprising a determination module and an acquisition module, wherein:

The determining module is used for determining parameters corresponding to an air inlet manifold of the engine, wherein the parameters corresponding to the air inlet manifold comprise an EGR rate of the air inlet manifold, a gas component of the air inlet manifold, a temperature of the air inlet manifold and a pressure of the air inlet manifold;

the acquisition module is used for acquiring the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model;

the acquisition module is further used for acquiring target parameters corresponding to the air cylinder according to parameters corresponding to the engine and a predetermined charge determination model, wherein the target parameters corresponding to the air cylinder at least comprise the total mass of fresh charges in the air cylinder;

It can be seen that the second aspect of the present invention is capable of accurately calculating the intake air amount of fresh air in the cylinder of the engine by determining the target parameter for calculating the cylinder and inputting the target parameter into the charge determination model for analysis, thereby facilitating the reduction of the combustion gas temperature in the combustion chamber of the cylinder and the accurate control of the fuel injection control, torque and air-fuel ratio of the engine and the complete combustion of the fuel in the combustion chamber, reducing the generation of harmful gases due to insufficient fuel combustion, and facilitating the suppression of knocking of the engine, so as to achieve an improvement in the fuel economy of the engine over the entire operating range.

A third aspect of the present invention discloses another apparatus for determining a fresh charge in an engine cylinder, the apparatus comprising:

a memory storing executable program code;

a processor coupled to the memory;

the processor invokes the executable program code stored in the memory to perform the method of determining a fresh charge in an engine cylinder disclosed in the first aspect of the invention.

A fourth aspect of the invention discloses a computer storage medium storing computer instructions which, when called, are adapted to carry out the method of determining a fresh charge in an engine cylinder as disclosed in the first aspect of the invention.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

the embodiment of the invention discloses a method and a device for determining fresh charge in an engine cylinder, wherein the method comprises the steps of determining parameters corresponding to an intake manifold of the engine, wherein the parameters corresponding to the intake manifold comprise an EGR rate of the intake manifold, a gas component of the intake manifold, a temperature of the intake manifold and a pressure of the intake manifold; obtaining the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model; obtaining a target parameter corresponding to a cylinder according to a parameter corresponding to the engine and a pre-determined charge determining model, wherein the target parameter corresponding to the cylinder at least comprises the total mass of fresh charges in the cylinder; the parameters corresponding to the engine comprise parameters corresponding to an intake manifold, a closing angle of an intake valve of the engine, a closing angle of an exhaust valve of the engine, a lambda value of exhaust gas discharged from a cylinder of the engine, a pressure corresponding to an exhaust gas charge of the intake manifold and a pressure corresponding to a fresh charge of the intake manifold. Therefore, by determining the target parameters used for calculating the cylinder and inputting the target parameters into the charge determining model for analysis, the embodiment of the invention can accurately calculate the air inflow of fresh air in the cylinder of the engine, thereby being beneficial to reducing the temperature of combustion gas in the combustion chamber of the cylinder, being beneficial to the accurate control of fuel injection control, torque and air-fuel ratio of the engine, being beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas caused by insufficient fuel combustion, and being beneficial to inhibiting the knocking of the engine, and realizing the improvement of the fuel economy of the engine in the whole working condition range.

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 schematic diagram of an engine control system for a method of determining a fresh charge in an engine cylinder in accordance with an embodiment of the present disclosure;

FIG. 2 is a flow chart of a method of determining a fresh charge in an engine cylinder according to an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of a device for determining a fresh charge in an engine cylinder in accordance with an embodiment of the present invention;

FIG. 4 is a schematic illustration of another engine cylinder fresh charge determination apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a fresh charge determination device in an engine cylinder according to yet another 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 invention without making any inventive effort, are intended to be within the scope of the invention.

The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps or elements is not limited to the list of steps or elements but may, in the alternative, include other steps or elements not expressly listed or inherent to such process, method, article, or device.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The invention discloses a method and a device for determining fresh charge in an engine cylinder, which can accurately calculate the air inflow of fresh air in the engine cylinder by determining a target parameter used for calculating the cylinder and inputting the target parameter into a charge determining model for analysis, thereby being beneficial to reducing the combustion gas temperature of the cylinder combustion chamber, being beneficial to the fuel injection control of the engine, the accurate control of torque and air-fuel ratio and being beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas caused by insufficient fuel combustion and being beneficial to inhibiting the knocking of the engine so as to realize the improvement of the fuel economy of the engine in the whole working condition range. The following will describe in detail.

For a better understanding of the method and apparatus for determining a fresh charge in an engine cylinder described in the present invention, an engine control system for determining a fresh charge in an engine cylinder is first described, and in particular, a schematic structure of the engine control system may be shown in fig. 1. As shown in fig. 1, the engine control system includes a cylinder, a turbine supercharger, a three-way catalyst 1, an EGR filter, an EGR cooler, an EGR valve, a differential pressure sensor, a mixing valve, an air flow Meter (MAF), a pressure release valve (bleed valve), a mixing chamber, an intercooler, and a throttle valve. Among these, a turbocharger includes a turbine and a compressor (also known as an impeller or compressor). The exhaust manifold, the turbine, the three-way catalyst 1, the EGR filter, the EGR cooler and the EGR valve of the engine cylinder are sequentially connected in series, the air outlet of the EGR valve and the air outlet of the mixing valve are respectively connected with the air inlet of the mixing cavity, the air outlet of the mixing cavity is connected with the air inlet of the air compressor, and the air inlet of the air compressor, the intercooler and the throttle valve are sequentially connected in series. Further, as shown in fig. 1, the engine control system further includes an exhaust valve (also called a bypass valve), one end of the exhaust valve is used for connecting an exhaust manifold of a cylinder of the engine with an air inlet of the turbine, the other end of the exhaust valve is used for connecting an air outlet of the turbine with the three-way catalyst 1, an air inlet of a pressure relief valve (also called a bleed valve) is used for connecting an air outlet of the compressor with the intercooler, an air outlet of the pressure relief valve is used for connecting an air outlet of the mixing valve, an air outlet of the EGR valve and an air inlet of the mixing cavity, and the air flow meter is arranged at one end of the air inlet of the mixing valve. Still further, as shown in fig. 1, the air outlet of the intercooler is provided with a pressure sensor and a temperature sensor, the air outlet of the air throttle is provided with a pressure sensor and a temperature sensor, and the air inlet and the air outlet of the three-way catalyst 1 are respectively provided with an oxygen sensor 1 and an oxygen sensor 1. Still further alternatively, the air inlet of the EGR valve is provided with a temperature sensor (not shown in the figure), both ends of the EGR valve are also provided with a differential pressure sensor for measuring the differential pressure of air at both ends of the EGR valve, and the mixing chamber is provided with a temperature sensor. The exhaust gas of the cylinder of the engine is conveyed to the three-way catalyst 1 through an exhaust manifold of the cylinder to perform oxidation operation, so as to obtain exhaust gas of three-element molecules such as carbon dioxide, water and the like, the opening of the exhaust gas is controlled by the EGR valve to realize that the oxidized exhaust gas is conveyed to the mixing cavity so that the exhaust gas is mixed with fresh air coming from the mixing valve in the mixing cavity, the gas after being mixed is compressed by the gas compressor, and the compressed gas is conveyed to the cylinder of the engine through the throttle valve after being cooled by the intercooler to participate in the combustion of fuel oil, so that the air inflow of fresh air in the cylinder of the engine is favorably calculated, the temperature of combustion gas in the combustion chamber of the cylinder is favorably reduced, the fuel injection control and torque of the engine are favorably realized, the accurate control of the air-fuel ratio of the engine is favorably realized, the fuel in the combustion chamber is favorably fully combusted, the generation of harmful gas is favorably reduced due to insufficient fuel combustion, and the knocking of the engine is favorably restrained, and the fuel oil economy of the engine is favorably improved within the whole working condition range. Further alternatively, after the exhaust gas is subjected to oxidation reduction by the three-way catalyst 1, particulate impurities in the exhaust gas are filtered by the EGR filter, so that the condition that the EGR valve is jammed is reduced. Still further alternatively, the exhaust gas is cooled by the EGR cooler after being filtered to remove impurities, so that the exhaust gas can be cooled preliminarily, and the combustion performance of the engine is improved.

Further optionally, when the rotational speed of the turbine exceeds a certain preset rotational speed threshold (for example, 2000 r/s), that is, when the turbosupercharger has a supercharging overshoot condition, the pressure release valve is controlled to be opened, so that the mixed gas is discharged from the pressure release valve through the mixing valve, thereby protecting the turbosupercharger and simultaneously ensuring the continuity of the EGR control.

Still further alternatively, the engine control system further includes a three-way catalyst 2, and the three-way catalyst 2 is disposed at an opposite end of the oxygen sensor 2 from the three-way catalyst 1, so that the oxidation operation can be performed again on the exhaust gas, which is advantageous for further reducing occurrence of the harmful gas discharged into the environment, thereby protecting the environment.

Still further alternatively, when turbo boost is not required, the exhaust valve is activated so that the exhaust gas flows from the exhaust valve to the three-way catalyst 1, and the exhaust gas is further oxidized by the three-way catalyst 2.

Still further alternatively, the oxygen sensor 1 detects the oxygen concentration in the exhaust gas and sends the oxygen concentration to the control unit of the engine, and when it is determined that the oxygen concentration is not within the preset oxygen concentration range (for example, 1.1-1.2), the control unit controls the EGR valve to be closed.

It should be noted that the schematic structural diagram of the engine control system shown in fig. 1 is only for illustrating an engine control system corresponding to a method for determining a fresh charge in an engine cylinder, the related devices are only schematically shown, and specific structures, dimensions, shapes, positions/mounting manners and the like may be adaptively adjusted according to actual situations, which is not limited by the schematic structural diagram shown in fig. 1.

The engine control system having described the method for determining the fresh charge in the engine cylinder is described in detail below.

Example 1

Referring to fig. 2, fig. 2 is a flow chart illustrating a method for determining a fresh charge in an engine cylinder according to an embodiment of the present invention. The method of determining the fresh charge in the engine cylinder depicted in fig. 2 is suitable for use in the engine control system/engine control unit/engine control terminal depicted in fig. 1. As shown in fig. 2, the method of determining a fresh charge in an engine cylinder may include the operations of:

101. parameters corresponding to an intake manifold of the engine are determined, the parameters corresponding to the intake manifold including an EGR rate of the intake manifold, a gas composition of the intake manifold, a temperature of the intake manifold, and a pressure of the intake manifold.

In the embodiment of the invention, the engine comprises any engine using fuel oil, such as a gasoline engine or a diesel engine, and the embodiment of the invention is not limited.

In the embodiment of the invention, the gas component of the intake manifold may include at least one of nitrogen, oxygen and water vapor, and when the EGR valve of the engine is in an open state, the gas component of the intake manifold may further include carbon dioxide.

102. And obtaining the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model.

103. And obtaining target parameters corresponding to the cylinders according to the parameters corresponding to the engine and a pre-determined charge determination model, wherein the target parameters corresponding to the cylinders at least comprise the total mass of fresh charges in the cylinders.

In the embodiment of the invention, the parameters corresponding to the engine comprise parameters corresponding to the intake manifold, a closing angle of an intake valve of the engine, a closing angle of an exhaust valve of the engine, a lambda value of exhaust gas discharged from a cylinder of the engine, a pressure corresponding to exhaust gas charge of the intake manifold and a pressure corresponding to fresh charge of the intake manifold. The temperature of the air inlet manifold and the pressure of the air inlet manifold are determined, and specifically, the temperature of the air inlet manifold and the pressure of the air inlet manifold are acquired through a sensor arranged on the air inlet manifold. Further, the sensor disposed in the intake manifold may be divided into a temperature sensor for acquiring the temperature of the intake manifold and a pressure sensor for acquiring the pressure of the intake manifold, or may be a sensor having both functions of acquiring the temperature and the pressure, which is not limited in the embodiment of the present invention. The phase signal of the cam shaft is read through the EMS, and the closing angle of an intake valve of the engine and the closing angle of an exhaust valve of the engine are calculated based on the phase signal.

In the embodiment of the invention, the target parameters corresponding to the cylinder can also comprise exhaust gas charge in the cylinder and EGR rate in the cylinder.

In an alternative embodiment, the predetermined charge determination model includes a predetermined pressure determination model and a predetermined charge calculation model, and obtaining the target parameters corresponding to the cylinders according to the parameters corresponding to the engine and the predetermined charge determination model includes:

according to the first sub-parameter and the pressure determining model, obtaining parameters corresponding to a cylinder of the engine when the intake valve is closed, wherein the parameters corresponding to the cylinder comprise pressure corresponding to the cylinder and temperature in the cylinder, and the pressure corresponding to the cylinder comprises pressure corresponding to fresh charge in the cylinder, pressure corresponding to exhaust gas charge in the cylinder and pressure corresponding to exhaust gas charge outside the cylinder;

obtaining target parameters corresponding to the air cylinder according to the second sub-parameters and the charge calculation model;

in this alternative embodiment, the first sub-parameter includes a closing angle of an intake valve, a closing angle of an exhaust valve, a temperature of an intake manifold of the engine, a pressure of the intake manifold, a gas composition of the intake manifold, a pressure corresponding to an exhaust charge of the intake manifold, and a pressure corresponding to a fresh charge of the intake manifold;

The second sub-parameter includes a parameter corresponding to the cylinder, a temperature of the intake manifold, a pressure of the intake manifold, a gas composition of the intake manifold, and a lambda value.

In this alternative embodiment, the pressure determination model and the pressure calculation model may be the same model, but the corresponding parameters are different.

In this alternative embodiment, the pressure corresponding to the exhaust gas charge outside the cylinder is equal to the product of the total charge pressure outside the cylinder, which is the last calculated EGR rate, and the EGR rate outside the cylinder at the time the intake valve closes, the total charge pressure outside the cylinder being measured by the intake manifold sensor. The pressure corresponding to the fresh charge in the cylinder is equal to the absolute value of the difference between the total charge pressure in the cylinder and the pressure corresponding to the exhaust gas charge in the cylinder. The method of calculating the pressure corresponding to the exhaust charge in the cylinder is prior art and will not be described in detail herein.

It can be seen that, in this alternative embodiment, the parameters corresponding to the cylinder are obtained by the pressure determining model, and then the parameters corresponding to the cylinder are combined with other parameters to obtain the target parameters corresponding to the cylinder by the charge calculating model, for example: the total mass of fresh charges in the cylinder can further improve the acquisition efficiency and the acquisition accuracy of target parameters corresponding to the cylinder.

In another alternative embodiment, determining parameters corresponding to an intake manifold of an engine may include:

determining the gas mass flow of a throttle valve of an engine, and determining parameters corresponding to a gas compressor of a turbine booster of the engine, wherein the parameters corresponding to the gas compressor comprise the gas mass flow of the gas compressor, the gas component of the gas compressor, the temperature of a gas outlet of the gas compressor and the pressure of the gas outlet of the gas compressor, the gas component of the gas compressor can comprise at least one of nitrogen, oxygen and water vapor, and when an EGR valve of the engine is in an open state, the gas component of the gas compressor can also comprise carbon dioxide;

determining parameters corresponding to an air outlet of a mixing cavity of the engine, wherein the parameters corresponding to the air outlet of the mixing cavity comprise a gas EGR rate of mixed gas obtained by mixing waste gas and fresh air, a gas mass flow of the mixed gas and a gas component of the mixed gas;

and obtaining parameters corresponding to the air inlet manifold according to the gas mass flow of the throttle valve, parameters corresponding to the gas compressor, parameters corresponding to the gas outlet of the mixing cavity and a predetermined delay model, wherein the parameters corresponding to the air inlet manifold comprise the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing cavity to the air inlet manifold, the EGR rate of the air inlet manifold and the gas composition of the air inlet manifold.

In this alternative embodiment, the gas EGR rate of the mixture is determined in combination with the pressure at the outlet of the EGR valve, the mass flow rate, temperature, composition of fresh air at the inlet of the mixing valve, the mass flow rate, temperature, composition at the outlet of the EGR valve, and the method of fourth order of the lange-Kutta (ringe-Kutta) and the krabbe equation.

In this alternative embodiment, the calculation formula of the delay model is:

where ρ is the density of the gas of the throttle valve,the gas EGR rate of the mixture is represented by u, the gas mass flow rate of the throttle valve, t, the time variable, and x, the spatial variable of the pipe between the mixing chamber and the throttle valve.

It can be seen that, in this alternative embodiment, by acquiring the gas mass flow of the throttle valve, the parameters corresponding to the gas compressor, and the parameters corresponding to the gas outlet of the mixing chamber, and combining with the delay model, the time required for the gas EGR rate of the mixed gas to be transferred from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and the acquisition of the gas components of the intake manifold can be achieved, and the acquisition efficiency can be improved.

In yet another alternative embodiment, obtaining parameters corresponding to the intake manifold according to the air mass flow of the throttle valve, parameters corresponding to the air compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model may include:

Obtaining a first sub-time required by the gas EGR rate of the mixed gas to be transmitted from the mixing cavity to the throttle valve, the gas EGR rate of the throttle valve and the gas composition of the throttle valve according to the third sub-parameter and a predetermined delay model;

obtaining a second sub-time required for the gas EGR rate of the throttle valve to be transmitted from the throttle valve to the intake manifold, the EGR rate of the intake manifold and the gas composition of the intake manifold according to the fourth sub-parameter and the delay model;

in this alternative embodiment, the third sub-parameter includes a parameter corresponding to the compressor and a parameter corresponding to the air outlet of the mixing chamber; the fourth sub-parameter includes a gas mass flow rate of the throttle valve, a gas EGR rate of the throttle valve, and a gas composition of the throttle valve; the time required for the gas EGR rate of the mixture to be transmitted from the mixing chamber to the intake manifold is the sum of the first sub-time and the second sub-time.

It can be seen that the alternative embodiment can improve the second sub-time required by the gas EGR rate of the throttle valve to be transmitted from the throttle valve to the intake manifold, the EGR rate of the intake manifold, and the acquisition efficiency and accuracy of the gas components of the intake manifold by using the delay model in a segmented manner, so as to improve the acquisition accuracy of the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold, and further improve the acquisition accuracy of the total mass of the fresh charge in the cylinder.

In yet another alternative embodiment, determining parameters corresponding to the air outlet of the mixing chamber may include:

determining parameters corresponding to an air outlet of a mixing valve of the engine, wherein the parameters corresponding to the air outlet of the mixing valve comprise air mass flow of the air outlet of the mixing valve, air components of the air outlet of the mixing valve and temperature of the air outlet of the mixing valve;

determining parameters corresponding to an EGR valve of an engine, wherein the parameters corresponding to the EGR valve comprise the pressure of an air inlet of the EGR valve, the pressure of an air outlet of the EGR valve, the temperature of the air inlet of the EGR valve and the opening degree of the EGR valve;

and obtaining parameters corresponding to the air outlet of the mixing cavity according to the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and a predetermined mixing model (for example, RK4 mixing model).

In this optional embodiment, further optionally, after obtaining the parameter corresponding to the air outlet of the mixing cavity according to the parameter corresponding to the air outlet of the mixing valve, the parameter corresponding to the EGR valve, and the predetermined mixing model, the method may further include:

and performing calibration operation on parameters corresponding to the air outlet of the mixing cavity based on a predetermined calibration method to obtain the calibrated parameters corresponding to the air outlet of the mixing cavity.

Therefore, in the optional embodiment, parameters corresponding to the air outlet of the mixing cavity can be obtained by obtaining the parameters corresponding to the EGR valve and combining the mixing model; and performing calibration operation on the acquired parameters corresponding to the air outlet of the mixing cavity, so that the acquisition precision of the parameters corresponding to the air outlet of the mixing cavity can be improved, the acquisition precision of the parameters corresponding to the air inlet manifold can be improved, the acquisition precision of the total mass of fresh charges in the cylinder can be improved, and the oil injection control, torque and air-fuel ratio of the engine can be further controlled accurately.

In yet another alternative embodiment, the parameters corresponding to the EGR valve further include a temperature of an air outlet of the EGR valve, and the predetermined mixing model includes a predetermined sub-mixing model and a predetermined first mass flow calculation model;

according to the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and the predetermined mixing model, the parameters corresponding to the air outlet of the mixing cavity are obtained, and the method comprises the following steps:

according to the parameters corresponding to the EGR valve and the first mass flow calculation model, obtaining parameters corresponding to the air outlet of the EGR valve, wherein the parameters corresponding to the air outlet of the EGR valve comprise the EGR mass flow of the air outlet of the EGR valve and the EGR gas components (such as nitrogen, carbon dioxide, water vapor and the like) of the air outlet of the EGR valve;

And obtaining parameters corresponding to the air outlet of the mixing cavity according to the parameters corresponding to the air outlet of the EGR valve, the parameters corresponding to the air outlet of the mixing valve and the sub-mixing model.

In this alternative embodiment, the calculation formula corresponding to the first mass flow calculation model is:

in the method, in the process of the invention,

wherein m is _egr An EGR mass flow rate for an outlet of an EGR valve, A _effe Is the effective area of the current opening degree of the EGR valve, C _fe For the flow coefficient of the EGR valve, P _ie Pressure, P, at the inlet of an EGR valve _oe For the pressure, P, at the outlet of the EGR valve _re Is the ratio of the pressure of the air outlet of the EGR valve to the pressure of the air inlet of the EGR valve, T _ie Gas temperature n for the inlet of an EGR valve _eng Is the rotation speed r of the engine _eng K and R are thermodynamic constants for engine load. The effective area of the opening of the EGR valve has a one-to-one correspondence with the opening of the EGR valve, namely, the effective area of the EGR valve corresponding to the current opening of the EGR valve can be found in a pre-established EGR valve opening table, so that the effective area of the current opening of the EGR valve can be rapidly determined through the one-to-one correspondence with the opening of the EGR valve.

Therefore, in the alternative embodiment, the parameters of the air outlet of the EGR valve are obtained through the mass flow computing model, and the obtaining efficiency and the obtaining accuracy of the parameters corresponding to the air outlet of the mixing cavity can be improved by combining the mixing model.

In yet another alternative embodiment, determining a gas mass flow rate of a throttle of an engine may include:

acquiring corresponding parameters of a throttle valve based on a sensor of the throttle valve, wherein the corresponding parameters of the throttle valve comprise the pressure of an air inlet of the throttle valve, the temperature of the air inlet of the throttle valve, the pressure of an air outlet of the throttle valve and the opening degree of the throttle valve;

and obtaining the gas mass flow of the throttle valve according to the corresponding parameters of the throttle valve and a second mass flow calculation model which is determined in advance.

In this alternative embodiment, the opening degree of the throttle valve is acquired by a position sensor provided at the throttle valve. Further, after the opening of the throttle valve is collected, a target equivalent flow area corresponding to the opening of the throttle valve is obtained from a predetermined opening-area database (such as a data table) based on the corresponding relation of the opening-area, and the operation of obtaining the gas mass flow of the throttle valve according to the parameters corresponding to the throttle valve and the predetermined second mass flow calculation model is triggered and executed, wherein the parameters corresponding to the throttle valve include the target equivalent flow area corresponding to the opening of the throttle valve.

In this alternative embodiment, each opening of the throttle valve has a corresponding equivalent flow area of the throttle valve, and an opening-area database is pre-established, where the database includes a unique correspondence between the opening of the throttle valve and the equivalent flow area corresponding to the opening, so that the efficiency of acquiring the equivalent flow area corresponding to the opening of the throttle valve can be improved.

It can be seen that this alternative embodiment enables the acquisition of the gas mass flow of the throttle valve by acquiring the corresponding parameters of the throttle valve in combination with a mass flow determination model.

In yet another alternative embodiment, determining parameters corresponding to the air outlet of a mixing valve of an engine may include:

acquiring parameters corresponding to an air inlet of a mixing valve of the engine based on an air flow sensor of the engine, wherein the parameters corresponding to the air inlet of the mixing valve comprise the temperature of the air inlet of the mixing valve, the pressure of the air inlet of the mixing valve, the air humidity of the air inlet of the mixing valve and the gas mass flow of the air inlet of the mixing valve;

and obtaining parameters corresponding to the air outlet of the mixing valve according to parameters corresponding to the air inlet of the mixing valve and a predetermined third mass flow calculation model.

In this alternative embodiment, the air flow sensor may be an air flow Meter (MAF) or an air mass meter (HFM), which is not limited.

It can be seen that, in this alternative embodiment, the parameters corresponding to the air outlet of the mixing valve can be obtained by obtaining the parameters corresponding to the air inlet of the mixing valve and combining with the mass flow calculation model.

In yet another alternative embodiment, the method of determining a fresh charge in an engine cylinder may further comprise the operations of:

determining the rotating speed of the engine and the load of the engine, and determining the target EGR rate of the engine according to the rotating speed of the engine and the load of the engine;

and acquiring an EGR rate difference value of the target EGR rate and the EGR rate in the cylinder, and controlling the opening of the EGR valve according to the EGR rate difference value and the acquired feedforward opening of the EGR valve so that the EGR rate in the cylinder meets the working condition requirement of the engine.

In this alternative embodiment, an EGR rate table is previously established, the EGR rate table including different engine speeds and different engine loads corresponding to different EGR rates. Further, according to different working conditions of the engine, the EGR rate meter can be divided into a first sub EGR rate meter under idle working conditions and a second sub EGR rate meter under non-idle working conditions. After the rotation speed of the engine and the load of the engine are obtained, the working condition of the engine is determined according to the rotation speed of the engine and the load of the engine, a corresponding sub-EGR rate table (the sub-EGR rate table comprises a first sub-EGR rate table or a second sub-EGR rate table) is determined according to the working condition of the engine, and the corresponding target EGR rate can be obtained by inquiring the sub-EGR rate table. In this way, the corresponding sub EGR rate table is determined through the rotation speed of the engine and the load of the engine, so that the searching range of the EGR rate can be reduced, and the searching efficiency of the target EGR rate is improved.

Therefore, in the optional embodiment, when the EGR rate in the cylinder is obtained, the target EGR rate of the engine under the current working condition is further obtained, and the opening degree of the EGR valve is controlled by combining the feedforward opening degree of the EGR valve, so that the control accuracy of the amount of exhaust gas and the amount of fresh air entering the cylinder in each cycle can be improved, the EGR rate in the cylinder can meet the working condition requirement of the engine, and further the EGR rate of the cylinder of the engine is subjected to closed-loop control, so that the dynamic control of the EGR rate is realized.

It can be seen that implementing the method for determining fresh charge in an engine cylinder described in fig. 2 can accurately calculate the intake air amount of fresh air in the engine cylinder by determining the target parameter for calculating the cylinder and inputting the target parameter into the charge determination model for analysis, thereby facilitating the reduction of the combustion gas temperature in the cylinder combustion chamber and the fuel injection control of the engine, the precise control of torque and air-fuel ratio, and the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas due to insufficient fuel combustion, and facilitating the suppression of knocking of the engine, so as to achieve the improvement of the fuel economy of the engine in the whole working condition range.

Example two

Referring now to fig. 3, fig. 3 is a schematic diagram illustrating an apparatus for determining a fresh charge in an engine cylinder according to an embodiment of the present invention. Wherein the means for determining the fresh charge in the engine cylinder depicted in fig. 3 is suitable for use in the engine control system depicted in fig. 1. As shown in fig. 3, the apparatus for determining a fresh charge in an engine cylinder may include a determination module 301 and an acquisition module 302, wherein:

a determining module 301 is configured to determine parameters corresponding to an intake manifold of the engine, where the parameters corresponding to the intake manifold include an EGR rate of the intake manifold, a gas composition of the intake manifold, a temperature of the intake manifold, and a pressure of the intake manifold.

The obtaining module 302 is configured to obtain a pressure corresponding to an exhaust charge of the intake manifold and a pressure corresponding to a fresh charge of the intake manifold according to parameters corresponding to the intake manifold and a predetermined pressure calculation model.

The obtaining module 302 is further configured to obtain a target parameter corresponding to a cylinder according to a parameter corresponding to the engine and a predetermined charge determination model, where the target parameter corresponding to the cylinder includes at least a total mass of fresh charges in the cylinder.

In the embodiment of the invention, the parameters corresponding to the engine comprise parameters corresponding to an intake manifold, a closing angle of an intake valve of the engine, a closing angle of an exhaust valve of the engine, a lambda value of exhaust gas discharged from a cylinder of the engine, a pressure corresponding to exhaust gas charge of the intake manifold and a pressure corresponding to fresh charge of the intake manifold.

It can be seen that implementing the device for determining fresh charge in an engine cylinder described in fig. 3 can accurately calculate the intake air amount of fresh air in the engine cylinder by determining the target parameter for calculating the cylinder and inputting the target parameter into the charge determination model for analysis, thereby facilitating the reduction of the combustion gas temperature in the cylinder combustion chamber and the fuel injection control of the engine, the accurate control of torque and air-fuel ratio, and the full combustion of fuel in the combustion chamber, reducing the generation of harmful gas due to insufficient fuel combustion, and facilitating the suppression of knocking of the engine, so as to achieve the improvement of the fuel economy of the engine in the whole working condition range.

In an alternative embodiment, the predetermined charge determination model includes a predetermined pressure determination model and a predetermined charge calculation model. And, as shown in fig. 4, the obtaining module 302 obtains the target parameters corresponding to the cylinders according to the parameters corresponding to the engine and the predetermined charge determining model specifically:

in this alternative embodiment, the second sub-parameter includes a cylinder corresponding parameter, an intake manifold temperature, an intake manifold pressure, an intake manifold gas composition, and a lambda value.

It can be seen that the apparatus for determining a fresh charge in a cylinder of an engine as illustrated in fig. 3 can be implemented to obtain parameters corresponding to the cylinder through a pressure determination model, and then combine the parameters corresponding to the cylinder with other parameters to obtain target parameters corresponding to the cylinder through a charge calculation model, for example: the total mass of fresh charges in the cylinder can further improve the acquisition efficiency and the acquisition accuracy of target parameters corresponding to the cylinder.

In another alternative embodiment, the determining module 301 includes a determining unit 3011 and an obtaining unit 3012 on the basis of the determining device for the fresh charge in the engine cylinder described in fig. 3, where the determining device for the fresh charge in the engine cylinder may be as shown in fig. 4, and fig. 4 is a schematic structural diagram of another determining device for the fresh charge in the engine cylinder, where:

A determination unit 3011 for determining a gas mass flow of a throttle valve of the engine.

The determining unit 3011 is further configured to determine parameters corresponding to a compressor of a turbocharger of the engine, where the parameters corresponding to the compressor include a gas mass flow rate of the compressor, a gas component of the compressor, a temperature of an air outlet of the compressor, and a pressure of the air outlet of the compressor;

the determining unit 3011 is further configured to determine parameters corresponding to an air outlet of a mixing chamber of the engine, where the parameters corresponding to the air outlet of the mixing chamber include a gas EGR rate of a mixed gas obtained by mixing exhaust gas and fresh air, a gas mass flow rate of the mixed gas, and a gas composition of the mixed gas.

And an obtaining unit 3012, configured to obtain parameters corresponding to an intake manifold according to the gas mass flow of the throttle valve, parameters corresponding to the gas compressor, parameters corresponding to the gas outlet of the mixing chamber, and a predetermined delay model, where the parameters corresponding to the intake manifold include a time required for the gas EGR rate of the mixed gas to be transferred from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and a gas composition of the intake manifold.

It can be seen that implementing the apparatus for determining a fresh charge in an engine cylinder described in fig. 4 can achieve the time required for the gas EGR rate of the mixed gas to be transferred from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and the acquisition of the gas composition of the intake manifold and improve the acquisition efficiency by acquiring the gas mass flow rate of the throttle valve, the parameters corresponding to the compressor, and the parameters corresponding to the gas outlet of the mixing chamber, in combination with the delay model.

In yet another alternative embodiment, as shown in fig. 4, the obtaining unit 3012 obtains the parameters corresponding to the intake manifold according to the air mass flow of the throttle valve, the parameters corresponding to the compressor, the parameters corresponding to the air outlet of the mixing chamber, and the predetermined delay model specifically:

in this optional embodiment, the third sub-parameter includes a parameter corresponding to the compressor and a parameter corresponding to an air outlet of the mixing chamber; the fourth sub-parameter includes a gas mass flow rate of the throttle valve, a gas EGR rate of the throttle valve, and a gas composition of the throttle valve; the time required for the gas EGR rate of the mixture to be transmitted from the mixing chamber to the intake manifold is the sum of the first sub-time and the second sub-time.

It can be seen that the apparatus for determining a fresh charge in an engine cylinder as described in fig. 4 can improve the second sub-time required for the gas EGR rate of the throttle valve to be transferred from the throttle valve to the intake manifold, the EGR rate of the intake manifold, and the acquisition efficiency and accuracy of the gas components of the intake manifold by using the delay model in a stepwise manner, thereby improving the accuracy of the acquisition of the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold, and further improving the accuracy of the acquisition of the total mass of the fresh charge in the cylinder.

In yet another alternative embodiment, as shown in fig. 4, the determining unit 3011 determines parameters corresponding to the air outlet of the mixing chamber specifically by:

and obtaining parameters corresponding to the air outlet of the mixing cavity according to the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and the predetermined mixing model.

It can be seen that the device for determining the fresh charge in the engine cylinder described in fig. 4 can also obtain the parameters corresponding to the EGR valve, and in combination with the mixing model, the parameters corresponding to the air outlet of the mixing chamber; and performing calibration operation on the acquired parameters corresponding to the air outlet of the mixing cavity, so that the acquisition precision of the parameters corresponding to the air outlet of the mixing cavity can be improved, the acquisition precision of the parameters corresponding to the air inlet manifold can be improved, the acquisition precision of the total mass of fresh charges in the cylinder can be improved, and the oil injection control, torque and air-fuel ratio of the engine can be further controlled accurately.

In yet another alternative embodiment, the parameters corresponding to the EGR valve further include a temperature of an air outlet of the EGR valve, and the predetermined mixing model includes a predetermined sub-mixing model and a predetermined first mass flow calculation model. And, as shown in fig. 4, the determining unit 3011 obtains parameters corresponding to the air outlet of the mixing cavity according to the fourth target parameter and the predetermined mixing model, specifically:

according to the parameters corresponding to the EGR valve and the first mass flow calculation model, obtaining parameters corresponding to the air outlet of the EGR valve, wherein the parameters corresponding to the air outlet of the EGR valve comprise the EGR mass flow of the air outlet of the EGR valve and the EGR gas component of the air outlet of the EGR valve;

It can be seen that the device for determining the fresh charge in the engine cylinder described in fig. 4 can also obtain the parameters of the air outlet of the EGR valve through the mass flow calculation model, and by combining with the mixing model, the obtaining efficiency and the obtaining accuracy of the parameters corresponding to the air outlet of the mixing cavity can be improved.

In yet another alternative embodiment, as shown in fig. 4, the manner in which the determining unit 3011 determines the gas mass flow rate of the throttle valve of the engine is specifically:

It can be seen that implementing the device for determining the fresh charge in the engine cylinder described in fig. 4 also enables the acquisition of the gas mass flow of the throttle valve by acquiring the parameters corresponding to the throttle valve, in combination with a mass flow determination model.

Example III

Referring to fig. 5, fig. 5 illustrates yet another apparatus for determining a fresh charge in a cylinder of an engine in accordance with an embodiment of the present invention. The apparatus for determining a fresh charge in an engine cylinder depicted in fig. 5 is suitable for use in the engine control system depicted in fig. 1. As shown in fig. 5, the apparatus for determining a fresh charge in a cylinder of the engine may include:

A memory 501 in which executable program codes are stored;

a processor 502 coupled to the memory 501;

further, an input interface 503 and an output interface 504 coupled to the processor 502 may also be included;

wherein the processor 502 invokes executable program code stored in the memory 501 for performing the steps of the method of determining a fresh charge in an engine cylinder described in embodiment one.

Example IV

The embodiment of the invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to execute the steps of the method for determining a fresh charge in an engine cylinder described in the embodiment one.

Example five

The present embodiment discloses a computer program product comprising a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps of the method for determining a fresh charge in an engine cylinder described in embodiment one.

The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.

Finally, it should be noted that: the embodiment of the invention discloses a method and a device for determining fresh charge in an engine cylinder, which are disclosed as preferred embodiments of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A method of determining a fresh charge in an engine cylinder, the method comprising:

Obtaining parameters corresponding to a cylinder of the engine when an intake valve is closed according to a first sub-parameter and a predetermined pressure determining model, wherein the parameters corresponding to the cylinder comprise pressure corresponding to the cylinder and temperature in the cylinder; the first sub-parameter includes a closing angle of the intake valve, a closing angle of the exhaust valve, a temperature of an intake manifold of the engine, a pressure of the intake manifold, a gas composition of the intake manifold, a pressure corresponding to an exhaust charge of the intake manifold, and a pressure corresponding to a fresh charge of the intake manifold;

obtaining target parameters corresponding to the air cylinder according to the second sub-parameters and a pre-determined charge calculation model; the second sub-parameter comprises a parameter corresponding to the cylinder, the temperature of the air inlet manifold, the pressure of the air inlet manifold, the gas component of the air inlet manifold and the lambda value of exhaust gas discharged from the cylinder of the engine, and the target parameter corresponding to the cylinder at least comprises the total mass of fresh charge in the cylinder;

2. The method of claim 1, wherein the cylinder-to-cylinder pressure comprises a fresh charge-to-cylinder pressure, an exhaust charge-to-exhaust pressure, and an exhaust charge-to-exhaust pressure.

3. The method of determining a fresh charge in an engine cylinder of claim 1, wherein determining parameters corresponding to an intake manifold of the engine comprises:

determining the gas mass flow of a throttle valve of the engine, and determining parameters corresponding to a gas compressor of a turbine booster of the engine, wherein the parameters corresponding to the gas compressor comprise the gas mass flow of the gas compressor, the gas composition of the gas compressor, the temperature of a gas outlet of the gas compressor and the pressure of the gas outlet of the gas compressor;

and obtaining parameters corresponding to the air inlet manifold according to the gas mass flow of the throttle valve, parameters corresponding to the gas compressor, parameters corresponding to the gas outlet of the mixing cavity and a predetermined delay model, wherein the parameters corresponding to the air inlet manifold comprise the time required by the gas EGR rate of the mixed gas to be transmitted from the mixing cavity to the air inlet manifold, the EGR rate of the air inlet manifold and the gas composition of the air inlet manifold.

4. A method of determining a fresh charge in an engine cylinder according to claim 3, wherein said obtaining parameters corresponding to the intake manifold based on the mass flow of gas of the throttle valve, parameters corresponding to the compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model comprises:

obtaining a first sub-time required by the gas EGR rate of the mixed gas to be transmitted from the mixing cavity to the throttle valve, the gas EGR rate of the throttle valve and the gas composition of the throttle valve according to a third sub-parameter and a predetermined delay model;

obtaining a second sub-time required for the gas EGR rate of the throttle valve to be transmitted from the throttle valve to the intake manifold, the EGR rate of the intake manifold and the gas composition of the intake manifold according to a fourth sub-parameter and the delay model;

the third sub-parameters comprise parameters corresponding to the air compressor and parameters corresponding to an air outlet of the mixing cavity; the fourth sub-parameter includes a gas mass flow rate of the throttle valve, a gas EGR rate of the throttle valve, and a gas composition of the throttle valve; the time required for the gas EGR rate of the mixture to be transmitted from the mixing chamber to the intake manifold is the sum of the first sub-time and the second sub-time.

5. The method of determining a fresh charge in an engine cylinder according to claim 3 or 4, wherein said determining parameters corresponding to the air outlet of the mixing chamber of the engine comprises:

determining parameters corresponding to an EGR valve of the engine, wherein the parameters corresponding to the EGR valve comprise the pressure of an air inlet of the EGR valve, the pressure of an air outlet of the EGR valve, the temperature of the air inlet of the EGR valve and the opening degree of the EGR valve;

and obtaining parameters corresponding to the air outlet of the mixing cavity according to the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and a predetermined mixing model.

6. The method of claim 5, wherein the parameters corresponding to the EGR valve further comprise a temperature of an outlet of the EGR valve, the predetermined mixture model comprising a predetermined sub-mixture model and a predetermined first mass flow calculation model;

The method for obtaining the parameters corresponding to the air outlet of the mixing cavity according to the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and the predetermined mixing model comprises the following steps:

obtaining parameters corresponding to an air outlet of the EGR valve according to the parameters corresponding to the EGR valve and the first mass flow calculation model, wherein the parameters corresponding to the air outlet of the EGR valve comprise the EGR mass flow of the air outlet of the EGR valve and the EGR gas component of the air outlet of the EGR valve;

7. The method of determining a fresh charge in an engine cylinder of claim 3, 4 or 6, wherein said determining a gas mass flow of a throttle of the engine comprises:

acquiring parameters corresponding to the throttle valve based on a sensor of the throttle valve, wherein the parameters corresponding to the throttle valve comprise the pressure of an air inlet of the throttle valve, the temperature of the air inlet of the throttle valve, the pressure of an air outlet of the throttle valve and the opening degree of the throttle valve;

8. A device for determining a fresh charge in an engine cylinder, the device comprising a determination module and an acquisition module, wherein:

the acquisition module is further used for acquiring parameters corresponding to a cylinder of the engine when the intake valve is closed according to the first sub-parameters and a predetermined pressure determination model, wherein the parameters corresponding to the cylinder comprise the pressure corresponding to the cylinder and the temperature in the cylinder; the first sub-parameter includes a closing angle of the intake valve, a closing angle of the exhaust valve, a temperature of an intake manifold of the engine, a pressure of the intake manifold, a gas composition of the intake manifold, a pressure corresponding to an exhaust charge of the intake manifold, and a pressure corresponding to a fresh charge of the intake manifold; obtaining target parameters corresponding to the air cylinder according to the second sub-parameters and a pre-determined charge calculation model; the second sub-parameter comprises a parameter corresponding to the cylinder, the temperature of the air inlet manifold, the pressure of the air inlet manifold, the gas component of the air inlet manifold and the lambda value of exhaust gas discharged from the cylinder of the engine, and the target parameter corresponding to the cylinder at least comprises the total mass of fresh charge in the cylinder;

9. The apparatus of claim 8 wherein the cylinder-to-cylinder pressures include a fresh charge-to-cylinder pressure, an exhaust charge-to-exhaust pressure, and an exhaust charge-to-exhaust pressure.

10. The apparatus for determining a fresh charge in an engine cylinder according to claim 8 or 9, wherein the determining module comprises a determining unit and an acquiring unit, wherein:

the determining unit is used for determining the gas mass flow of a throttle valve of the engine;

the determining unit is further configured to determine parameters corresponding to a compressor of a turbocharger of the engine, where the parameters corresponding to the compressor include a gas mass flow rate of the compressor, a gas component of the compressor, a temperature of an air outlet of the compressor, and a pressure of the air outlet of the compressor;

The determining unit is further configured to determine parameters corresponding to an air outlet of a mixing chamber of the engine, where the parameters corresponding to the air outlet of the mixing chamber include a gas EGR rate of a mixed gas obtained by mixing exhaust gas and fresh air, a gas mass flow rate of the mixed gas, and a gas component of the mixed gas;

the acquisition unit is used for acquiring parameters corresponding to the air inlet manifold according to the air mass flow of the throttle valve, parameters corresponding to the air compressor, parameters corresponding to the air outlet of the mixing cavity and a predetermined delay model, wherein the parameters corresponding to the air inlet manifold comprise the time required by the gas EGR rate of the mixed gas to be transmitted from the mixing cavity to the air inlet manifold, the EGR rate of the air inlet manifold and the gas composition of the air inlet manifold.

11. The apparatus according to claim 10, wherein the obtaining unit obtains the parameters corresponding to the intake manifold based on the air mass flow rate of the throttle valve, the parameters corresponding to the compressor, the parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model, specifically:

12. A device for determining a fresh charge in an engine cylinder, the device comprising:

a memory storing executable program code;

a processor coupled to the memory;

The processor invokes the executable program code stored in the memory to perform the method of determining a fresh charge in an engine cylinder as claimed in any one of claims 1 to 7.