CN114000954B - A method and device for determining fresh charge in an engine cylinder - Google Patents

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

A method and device for determining fresh charge in an engine cylinder

Technical field

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

Background technique

Low Pressure Exhaust Gas Re-circulation (LP-EGR) is currently a hot technology for engine energy saving and emission reduction. Its principle is to return the exhaust gas generated by engine combustion to the engine's intake system and mix it with fresh air. Participate in the combustion of fuel in the cylinder. Since the exhaust gas produced by engine combustion contains a large number of triatomic molecules such as carbon dioxide and water with large specific heat capacities, when the exhaust gas is returned to the engine cylinder, the triatomic molecules in the exhaust gas can dilute the charge in the cylinder and improve fuel efficiency. Combustion phase can reduce the temperature of the combustion gas in the cylinder combustion chamber, thereby allowing the fuel in the combustion chamber to be fully burned, which is beneficial to reducing the generation of harmful gases caused by insufficient fuel combustion, and is beneficial to suppressing engine knocking, thus ensuring better performance throughout the entire process. Improve engine fuel economy within the operating conditions.

For the entire engine control system, the main function of 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 working conditions. In practical applications, the amount of fresh air entering the cylinder is generally estimated by calculating the EGR rate in the engine cylinder. However, practice has found that since the low-pressure EGR system is located at the end of the engine intake and exhaust system, the flow pressure difference of exhaust gas in the low-pressure EGR system pipeline is small, and the low-pressure EGR system pipeline is long, which can easily cause the engine dynamic process to The calculation accuracy of the medium EGR rate is low, which leads to the low accuracy of the calculation of the fresh air intake volume in the cylinder. Therefore, it is particularly important to accurately calculate the intake volume of fresh air in the engine cylinder to achieve a solution to improve the fuel economy of the engine within the entire operating range.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and device for determining the fresh air charge in the engine cylinder, which can accurately calculate the intake amount of fresh air in the engine cylinder, so as to improve the fuel consumption of the engine within the entire working condition range. Economy.

In order to solve the above technical problems, a first aspect of the embodiment of the present invention discloses a method for determining the fresh charge in the engine cylinder. The method includes:

Determine the parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, and the temperature of the intake manifold. and said intake manifold pressure;

According to the parameters corresponding to the intake manifold and the predetermined pressure calculation model, obtain 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 engine and the predetermined charge determination model, the target parameters corresponding to the cylinder are obtained, and the target parameters corresponding to the cylinder at least include the total mass of fresh charge in the cylinder;

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

It can be seen that the first aspect of the present invention can accurately calculate the intake volume of fresh air in the engine cylinder by determining the target parameters used to calculate the cylinder, and inputting the target parameters into the charge determination model for analysis, thereby conducive to reducing the cylinder load. The combustion gas temperature in the combustion chamber is beneficial to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gases caused by insufficient fuel combustion, and is beneficial to suppressing the engine's Detonation to improve engine fuel economy over the entire operating range.

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

The determination module is used to determine parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, the the temperature of the intake manifold and the pressure of the intake manifold;

The acquisition module is used to obtain the pressure corresponding to the exhaust gas charge of the intake manifold and the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model. The pressure corresponding to the quantity;

The acquisition module is further configured to obtain the target parameters corresponding to the cylinder according to the parameters corresponding to the engine and the predetermined charge determination model. The target parameters corresponding to the cylinder at least include the fresh charge in the cylinder. total mass;

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

It can be seen that the second aspect of the present invention can accurately calculate the intake volume of fresh air in the engine cylinder by determining the target parameters used to calculate the cylinder, and inputting the target parameters into the charge determination model for analysis, thereby conducive to reducing the cylinder load. The combustion gas temperature in the combustion chamber is beneficial to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gases caused by insufficient fuel combustion, and is beneficial to suppressing the engine's Detonation to improve engine fuel economy over the entire operating range.

A third aspect of the present invention discloses another device for determining the fresh charge in the engine cylinder. The device for determining the fresh charge in the engine cylinder includes:

Memory that stores executable program code;

a processor coupled to said memory;

The processor calls the executable program code stored in the memory to execute the method for determining the fresh charge in the engine cylinder disclosed in the first aspect of the present invention.

A fourth aspect of the present invention discloses a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are called, they are used to perform the determination of the fresh charge in the engine cylinder disclosed in the first aspect of the present invention. method.

Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, a method and device for determining the fresh charge in an engine cylinder are disclosed. The method includes determining parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the intake manifold. The EGR rate, the gas composition of the intake manifold, the temperature of the intake manifold and the pressure of the intake manifold; according to the corresponding parameters of the intake manifold and the predetermined pressure calculation model, the value of the intake manifold is obtained The pressure corresponding to the exhaust gas charge and the pressure corresponding to the fresh charge of the intake manifold; according to the parameters corresponding to the engine and the predetermined charge determination model, the target parameters corresponding to the cylinder are obtained, and the target parameters corresponding to the cylinder include at least the cylinder The total mass of fresh charge in value, the pressure corresponding to the exhaust gas charge in the intake manifold, and the pressure corresponding to the fresh charge in the intake manifold. It can be seen that by implementing the embodiment of the present invention, by determining the target parameters used to calculate the cylinder and inputting the target parameters into the charge determination model for analysis, the intake amount of fresh air in the engine cylinder can be accurately calculated, thereby conducive to reducing cylinder combustion. The combustion gas temperature in the combustion chamber is beneficial to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is beneficial to the full combustion of fuel in the combustion chamber, reducing the generation of harmful gases caused by insufficient fuel combustion, and is beneficial to suppressing the explosion of the engine. shock to achieve improved engine fuel economy across the entire operating range.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an engine control system of a method for determining fresh charge in an engine cylinder disclosed in an embodiment of the present invention;

Figure 2 is a schematic flowchart of a method for determining the fresh charge in an engine cylinder disclosed in an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a device for determining fresh charge in an engine cylinder disclosed in an embodiment of the present invention;

Figure 4 is a schematic structural diagram of another device for determining fresh charge in an engine cylinder disclosed in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of yet another device for determining fresh charge in an engine cylinder disclosed in an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

The terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than describing a specific sequence. Furthermore, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes Other steps or units inherent to such processes, methods, products or devices.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of this phrase 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 skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

The invention discloses a method and device for determining the fresh charge in the engine cylinder, which can accurately calculate the fresh charge in the engine cylinder by determining the target parameters used to calculate the cylinder and inputting the target parameters into the charge determination model for analysis. The amount of fresh air intake is beneficial to reducing the combustion gas temperature in the cylinder combustion chamber, and is beneficial to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is beneficial to the full combustion of fuel in the combustion chamber, reducing incomplete fuel combustion. It results in the generation of harmful gases and helps suppress engine knocking, thereby improving the engine's fuel economy across the entire operating range. Each is explained in detail below.

In order to better understand the method and device for determining the fresh charge in the engine cylinder described in the present invention, first the engine control system of the method for determining the fresh charge in the engine cylinder is described. Specifically, the engine control system The structural diagram can be shown in Figure 1. As shown in Figure 1, the engine control system includes cylinders, turbochargers, three-way catalytic converters 1, EGR filters, EGR coolers, EGR valves, differential pressure sensors, mixing valves, air flow meters (MAF), exhaust pressure valve (bleeder valve), mixing chamber, intercooler and throttle. Among them, the turbocharger includes a turbine and a compressor (also called an impeller or compressor). Among them, the exhaust manifold, turbine, three-way catalytic converter 1, EGR filter, EGR cooler, and EGR valve of the engine cylinder are connected in series in sequence. 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 chamber. The air outlet of the mixing chamber is connected to the air inlet of the compressor, and the air inlet, intercooler and throttle of the compressor are connected in series. Further, as shown in Figure 1, the engine control system also includes a wastegate valve (also called a bypass valve). One end of the wastegate valve is used to connect the exhaust manifold of the engine cylinder and the air inlet of the turbine. The other end is used to connect the air outlet of the turbine and the three-way catalytic converter 1. The air inlet of the pressure relief valve (also called the bleed valve) is used to connect the air outlet of the compressor and the intercooler. The air outlet of the pressure relief valve is used To connect the air outlet of the mixing valve, the air outlet of the EGR valve and the air inlet of the mixing chamber, the air flow meter is arranged at one end of the air inlet of the mixing valve. Furthermore, as shown in Figure 1, the air outlet of the intercooler is provided with a pressure sensor and a temperature sensor, the air outlet of the throttle valve is provided with a pressure sensor and a temperature sensor, and the air inlet and outlet of the three-way catalytic converter 1 are respectively Set up aerobic sensor 1 and oxygen sensor 1. Further optionally, the air inlet of the EGR valve is equipped with a temperature sensor (not marked in the figure), and both ends of the EGR valve are also equipped with differential pressure sensors for measuring the air pressure difference between both ends of the EGR valve. The mixing chamber is provided with Temperature Sensor. Among them, the exhaust gas from the engine cylinder is transported to the three-way catalytic converter 1 through the exhaust manifold of the cylinder to perform an oxidation operation to obtain exhaust gas with three-atom molecules such as carbon dioxide and water. The opening of the EGR valve is then controlled to achieve the oxidized exhaust gas. It is sent to the mixing chamber to mix the exhaust gas with the fresh air coming in from the mixing valve. The compressor performs a compression operation on the mixed gas, and the compressed gas is cooled by the intercooler and sent to the In the engine cylinder, it participates in the combustion of fuel, which is beneficial to accurately calculating the intake volume of fresh air in the engine cylinder, which is beneficial to reducing the temperature of the combustion gas in the cylinder combustion chamber and is beneficial to the engine's fuel injection control, torque and accurate air-fuel ratio. It controls and is conducive to the full combustion of fuel in the combustion chamber, reduces the generation of harmful gases caused by insufficient fuel combustion, and is conducive to suppressing engine knocking, so as to improve the fuel economy of the engine within the entire operating range. Further optionally, after the exhaust gas is oxidized and reduced by the three-way catalytic converter 1, it first passes through the EGR filter to filter out the particulate impurities in the exhaust gas, which is beneficial to reducing congestion in the EGR valve. Optionally, after the exhaust gas is filtered to remove impurities, it is cooled by an EGR cooler, which can initially cool the exhaust gas and help improve the combustion performance of the engine.

Further optionally, when the turbine speed exceeds a certain preset speed threshold (for example: 2000r/s), that is, when the turbocharger has a supercharge overshoot condition, the pressure relief valve is controlled to open so that the mixed gas can be released from the pressure The valve is discharged through the mixing valve to protect the turbocharger and ensure the continuity of EGR control.

Optionally, the engine control system also includes a three-way catalytic converter 2. The three-way catalytic converter 2 is arranged at the opposite end of the oxygen sensor 2 and the three-way catalytic converter 1, so that the exhaust gas can be oxidized again, which is beneficial to Further reduce the emission of harmful gases into the environment, thus protecting the environment.

Further optionally, when turbocharging is not required, the wastegate valve is activated so that the exhaust gas flows from the wastegate valve to the three-way catalytic converter 1, and then passes through the three-way catalytic converter 2 to further oxidize the exhaust gas.

Further optionally, the oxygen sensor 1 detects the oxygen concentration in the exhaust gas and sends the oxygen concentration to the control unit of the engine. 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 The unit controls the EGR valve to close.

It should be noted that the schematic structural diagram of the engine control system shown in Figure 1 is only to represent the engine control system corresponding to the method for determining the fresh charge in the engine cylinder. The devices involved are only schematically displayed. The specific structure/dimension/ The shape/location/installation method, etc. can be adjusted adaptively according to the actual scene. The structural diagram shown in Figure 1 does not limit this.

The engine control system and the method for determining the fresh charge in the engine cylinder have been described above. The method and device for determining the fresh charge in the engine cylinder will be described in detail below.

Embodiment 1

Please refer to FIG. 2 , which is a schematic flowchart of a method for determining the fresh charge in an engine cylinder disclosed in an embodiment of the present invention. The method for determining the fresh charge in the engine cylinder described in Figure 2 is applicable to the engine control system/engine control unit/engine control terminal described in Figure 1 . As shown in Figure 2, the method for determining the fresh charge in the engine cylinder may include the following operations:

101. Determine the parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, the temperature of the intake manifold, and the intake manifold. pressure.

In the embodiment of the present invention, the engine includes any engine using fuel such as a gasoline engine or a diesel engine, which is not limited in the embodiment of the present invention.

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

102. According to the parameters corresponding to the intake manifold and the predetermined pressure calculation model, obtain the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold.

103. According to the parameters corresponding to the engine and the predetermined charge determination model, obtain the target parameters corresponding to the cylinder. The target parameters corresponding to the cylinder at least include the total mass of fresh charge in the cylinder.

In the embodiment of the present invention, the parameters corresponding to the engine include the parameters corresponding to the above-mentioned intake manifold, the closing angle of the intake valve of the engine, the closing angle of the exhaust valve of the engine, the lambda value of the exhaust gas discharged from the cylinder of the engine, the above-mentioned The pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold. Among them, the temperature of the intake manifold and the pressure of the intake manifold are determined. Specifically, the temperature of the intake manifold and the pressure of the intake manifold are collected through a sensor provided on the intake manifold. Further, the sensors provided on the intake manifold can be divided into a temperature sensor for collecting the temperature of the intake manifold and a pressure sensor for collecting the pressure of the intake manifold, or can also be a sensor that has the function of collecting temperature and pressure at the same time. The sensor is not limited in the embodiment of the present invention. Among them, the camshaft phase signal is read through the EMS, and the closing angle of the engine's intake valve and the closing angle of the engine's exhaust valve are calculated based on the phase signal.

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

In an optional embodiment, the above-mentioned predetermined charge determination model includes a predetermined pressure determination model and a predetermined charge calculation model, based on the parameters corresponding to the engine and the predetermined charge determination model. , obtain the target parameters corresponding to the cylinder, including:

According to the first sub-parameter and the pressure determination model, the parameters corresponding to the cylinder of the engine are obtained when the intake valve is closed. The parameters corresponding to the cylinder include the pressure corresponding to the cylinder and the temperature in the cylinder. The pressure corresponding to the cylinder includes the fresh charge in the cylinder. The pressure corresponding to the quantity, the pressure corresponding to the exhaust gas charge inside the cylinder, and the pressure corresponding to the exhaust gas charge outside the cylinder;

According to the second sub-parameter and the charge calculation model, the target parameters corresponding to the cylinder are obtained;

In this optional embodiment, the first sub-parameter includes the closing angle of the intake valve, the closing angle of the exhaust valve, the temperature of the intake manifold of the engine, the pressure of the intake manifold, and the gas group of the intake manifold. points, the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold;

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

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

In this optional embodiment, the pressure corresponding to the exhaust gas charge outside the cylinder is equal to the product value of the total charge pressure outside the cylinder and the EGR rate outside the cylinder at the time when the intake valve is closed, where the EGR rate outside the cylinder For the last calculated EGR rate, the total charge pressure outside the cylinder is 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 calculation method of the pressure corresponding to the exhaust gas charge in the cylinder is an existing technology and will not be described in detail here.

It can be seen that this optional embodiment first obtains the parameters corresponding to the cylinder through the pressure determination model, and then combines the parameters corresponding to the cylinder with other parameters and the charge calculation model to obtain the target parameters corresponding to the cylinder, for example: the total mass of fresh charge in the cylinder , which can further improve the acquisition efficiency and accuracy of the target parameters corresponding to the cylinder.

In another optional embodiment, determining parameters corresponding to the engine's intake manifold may include:

Determine the gas mass flow of the engine's throttle, and determine the corresponding parameters of the compressor of the engine's turbocharger. The corresponding parameters of the compressor include the gas mass flow of the compressor, the gas composition of the compressor, and the air outlet of the compressor. temperature and pressure at the outlet of the compressor, where the gas components of the compressor may include at least one of nitrogen, oxygen and water vapor. When the EGR valve of the engine is in an open state, the gas components of the compressor may also be including carbon dioxide;

Determine the parameters corresponding to the air outlet of the mixing chamber of the engine. The parameters corresponding to the air outlet of the mixing chamber include the gas EGR rate of the mixed gas after the exhaust gas and fresh air are mixed, the gas mass flow rate of the mixed gas, and the gas composition of the mixed gas;

According to the gas mass flow rate of the throttle, the parameters corresponding to the compressor, the parameters corresponding to the air outlet of the mixing chamber, and the predetermined delay model, the parameters corresponding to the intake manifold are obtained. The parameters corresponding to the intake manifold include the mixed gas The time required for the gas EGR rate to be transmitted from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and the gas composition of the intake manifold.

In this optional embodiment, the pressure of the air outlet of the EGR valve, the mass flow rate, temperature, and composition of fresh air at the air inlet of the mixing valve are combined with the mass flow rate, temperature, and composition of the air outlet of the EGR valve and Longge -Kutta (Runge-Kutta) fourth-order method and Clapeyron equation to determine the gas EGR rate of the mixed gas.

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

In the formula, ρ is the density of gas in the throttle valve, represents the gas EGR rate of the mixed gas, u represents the gas mass flow rate of the throttle, t represents the time variable, and x represents the spatial variable of the pipe between the mixing chamber and the throttle.

It can be seen that this optional embodiment can realize the transmission of the gas EGR rate of the mixed gas from the mixing chamber to The time required for the intake manifold, the EGR rate of the intake manifold, and the gas components of the intake manifold are obtained and the acquisition efficiency is improved.

In yet another optional embodiment, the parameters corresponding to the intake manifold can be obtained based on the gas mass flow rate of the throttle, parameters corresponding to the compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model. include:

According to the third sub-parameter and the predetermined delay model, obtain the first sub-time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the throttle, the gas EGR rate of the throttle, and the gas composition of the throttle;

According to the fourth sub-parameter and the delay model, the 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 group of the intake manifold are obtained point;

In this optional embodiment, the third sub-parameter includes parameters corresponding to the compressor and the parameters corresponding to the gas outlet of the mixing chamber; the fourth sub-parameter includes the gas mass flow rate of the throttle valve, the gas EGR rate of the throttle valve, and the gas EGR rate of the throttle valve. Gas composition; the time required for the gas EGR rate of the mixed gas 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 this optional embodiment can improve the 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 efficiency and accuracy of obtaining the gas components of the intake manifold are improved, thereby improving the accuracy of 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, thereby further improving the accuracy of the acquisition of the gas components in the intake manifold. The accuracy of obtaining the total mass of fresh charge.

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

Determine the parameters corresponding to the air outlet of the mixing valve of the engine. The parameters corresponding to the air outlet of the mixing valve include the air mass flow rate of the air outlet of the mixing valve, the air composition of the air outlet of the mixing valve, and the temperature of the air outlet of the mixing valve;

Determine the parameters corresponding to the EGR valve of the engine. The parameters corresponding to the EGR valve include the pressure of the air inlet of the EGR valve, the pressure of the air outlet of the EGR valve, the temperature of the air inlet of the EGR valve, and the opening of the EGR valve;

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 (for example: RK4 mixing model), the parameters corresponding to the air outlet of the mixing chamber are obtained.

In this optional embodiment, further optionally, after obtaining the parameters corresponding to the gas outlet of the mixing chamber according to the parameters corresponding to the gas outlet of the mixing valve, the parameters corresponding to the EGR valve and the predetermined mixing model, the method further Can include:

A calibration operation is performed on the parameters corresponding to the air outlet of the mixing chamber based on the predetermined calibration method to obtain the calibrated parameters corresponding to the air outlet of the mixing chamber.

It can be seen that this optional embodiment can obtain the parameters corresponding to the air outlet of the mixing chamber by obtaining the parameters corresponding to the EGR valve and combining it with the mixing model; and by performing a calibration operation on the obtained parameters corresponding to the air outlet of the mixing chamber. , can improve the acquisition accuracy of the parameters corresponding to the air outlet of the mixing chamber, which is conducive to improving the acquisition accuracy of the parameters corresponding to the intake manifold, which in turn is conducive to improving the acquisition accuracy of the total mass of fresh charge in the cylinder, so as to further realize the engine Precise control of fuel injection control, torque and air-fuel ratio.

In yet another optional embodiment, the parameters corresponding to the above-mentioned EGR valve also include the temperature of the air outlet of the EGR valve, and the predetermined mixing model includes a predetermined sub-mixing model and a predetermined first mass flow rate 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 chamber are obtained, including:

According to the parameters corresponding to the EGR valve and the first mass flow calculation model, the parameters corresponding to the air outlet of the EGR valve are obtained. The parameters corresponding to the air outlet of the EGR valve include the EGR mass flow rate of the air outlet of the EGR valve and the EGR of the air outlet of the EGR valve. Gas components (for example: nitrogen, carbon dioxide, water vapor, etc.);

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, the parameters corresponding to the air outlet of the mixing chamber are obtained.

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

In the formula,

Among them, _megr is the EGR mass flow rate at the outlet of the EGR valve, A _effe is the effective area of the current opening of the EGR valve, C _fe is the flow coefficient of the EGR valve, P _ie is the pressure of the air inlet of the EGR valve, and P _oe is the pressure at the air outlet of the EGR valve, _Pre is the ratio of the pressure at the air outlet of the EGR valve to the pressure at the air inlet of the EGR valve, T _{ie is} the gas temperature at the air inlet of the EGR valve, and n _eng is the engine speed. , r _eng is the load of the engine, k and R are thermodynamic constants. Among them, the effective area of the EGR valve opening has a one-to-one correspondence with the opening of the EGR valve. That is, the effective area of the EGR valve corresponding to the current opening of the EGR valve can be found in the pre-established EGR valve opening table. In this way, through the one-to-one correspondence between the effective area of the EGR valve opening and the EGR valve opening, the effective area of the current opening of the EGR valve can be quickly determined.

It can be seen that this optional embodiment first obtains the parameters of the air outlet of the EGR valve through the mass flow calculation model, and combined with the mixing model, can improve the acquisition efficiency and accuracy of the parameters corresponding to the air outlet of the mixing chamber.

In yet another optional embodiment, determining the gas mass flow rate of the engine's throttle may include:

The throttle-based sensor collects parameters corresponding to the throttle. The parameters corresponding to the throttle include the pressure of the air inlet of the throttle, the temperature of the air inlet of the throttle, the pressure of the air outlet of the throttle, and the opening of the throttle;

According to the parameters corresponding to the throttle and the predetermined second mass flow calculation model, the gas mass flow of the throttle is obtained.

In this optional embodiment, the opening of the throttle valve is collected through a position sensor provided on the throttle valve. Further, after collecting the opening of the throttle valve, the 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 opening-area correspondence. and trigger the execution of the above-mentioned operation of obtaining the gas mass flow rate of the throttle valve based on the parameters corresponding to the throttle valve and the predetermined second mass flow rate calculation model. At this time, the parameters corresponding to the throttle valve include the target corresponding to the opening degree of the throttle valve. Equivalent circulation area.

In this optional embodiment, each opening degree of the throttle valve has a corresponding equivalent flow area of the throttle valve, and an opening degree-area database is pre-established. The database includes the opening degree of the throttle valve and the corresponding opening degree. The unique corresponding relationship between the equivalent flow areas, which can improve the acquisition efficiency of the equivalent flow area corresponding to the throttle opening.

It can be seen that this optional embodiment can obtain the gas mass flow rate of the throttle valve by collecting parameters corresponding to the throttle valve and combining it with the mass flow rate determination model.

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

The engine-based air flow sensor collects parameters corresponding to the air inlet of the mixing valve of the engine. The parameters corresponding to the air inlet of the mixing valve include the temperature of the air inlet of the mixing valve, the pressure of the air inlet of the mixing valve, the mixing valve The air humidity at the air inlet and the gas mass flow rate at the air inlet of the mixing valve;

According to the parameters corresponding to the air inlet of the mixing valve and the predetermined third mass flow calculation model, the parameters corresponding to the air outlet of the mixing valve are obtained.

In this optional embodiment, the air flow sensor may be an air flow meter (MAF) or an air quality meter (HFM), which is not limited in this optional embodiment.

It can be seen that this optional embodiment can obtain the parameters corresponding to the air outlet of the mixing valve by obtaining the parameters corresponding to the air inlet of the mixing valve and combining it with the mass flow calculation model.

In yet another optional embodiment, the method for determining the fresh charge in the engine cylinder may also include the following operations:

Determine the engine speed and engine load, and determine the engine target EGR rate based on the engine speed and engine load;

Obtain the EGR rate difference between the target EGR rate and the EGR rate in the cylinder, and control the opening of the EGR valve based on the EGR rate difference and the obtained feedforward opening of the EGR valve, so that the EGR rate in the cylinder meets the engine's requirements. Working condition requirements.

In this optional embodiment, an EGR rate table is established in advance. The EGR rate table includes EGR rates corresponding to different engine speeds and different engine loads, and different engine speeds and different engine loads correspond to different EGR rates. EGR rate. Further, according to the different operating conditions of the engine, the EGR rate table can be divided into a first sub-EGR rate table under idle conditions and a second sub-EGR rate table under non-idling conditions. After obtaining the engine speed and the engine load, the engine operating conditions are determined based on the engine speed and the engine load, and the corresponding sub-EGR rate table is determined based on the engine operating conditions (the sub-EGR rate table includes the first sub-EGR rate table or the second sub-EGR rate table), the corresponding target EGR rate can be obtained by querying the sub-EGR rate table. In this way, the corresponding sub-EGR rate table is first determined by the engine speed and engine load, which can narrow the search range of the EGR rate, thereby improving the search efficiency of the target EGR rate.

It can be seen that this optional embodiment further obtains the target EGR rate of the engine under the current working conditions when obtaining the EGR rate in the cylinder, and controls the opening of the EGR valve in combination with the feedforward opening of the EGR valve, which can improve the efficiency of each operation. The control accuracy of the amount of exhaust gas and fresh air entering the cylinder in one cycle enables the EGR rate in the cylinder to meet the operating conditions of the engine, and then performs closed-loop control of the EGR rate of the engine cylinder to achieve dynamic control of the EGR rate.

It can be seen that the method for determining the fresh charge in the engine cylinder described in Figure 2 can accurately calculate the fresh charge in the engine cylinder by determining the target parameters used to calculate the cylinder and inputting the target parameters into the charge determination model for analysis. The air intake volume is conducive to reducing the combustion gas temperature of the cylinder combustion chamber and is conducive to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is conducive to the full combustion of fuel in the combustion chamber, reducing the causes of insufficient fuel combustion. The generation of harmful gases and the suppression of engine knocking are beneficial to improve the fuel economy of the engine within the entire operating range.

Embodiment 2

Please refer to FIG. 3 , which is a schematic structural diagram of a device for determining fresh charge in an engine cylinder disclosed in an embodiment of the present invention. The device for determining the fresh charge in the engine cylinder described in FIG. 3 is applicable to the engine control system described in FIG. 1 . As shown in Figure 3, the device for determining the fresh charge in the engine cylinder may include a determination module 301 and an acquisition module 302, where:

The determination module 301 is used to determine the parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, the temperature of the intake manifold, and The intake manifold pressure.

The acquisition module 302 is configured to obtain the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold based on the parameters corresponding to the intake manifold and the predetermined pressure calculation model.

The acquisition module 302 is also configured to obtain the target parameters corresponding to the cylinder according to the parameters corresponding to the engine and the predetermined charge determination model. The target parameters corresponding to the cylinder at least include the total mass of fresh charge in the cylinder.

In the embodiment of the present invention, the parameters corresponding to the engine include parameters corresponding to the intake manifold, the closing angle of the intake valve of the engine, the closing angle of the exhaust valve of the engine, the lambda value of the exhaust gas discharged from the cylinder of the engine, the intake air The pressure corresponding to the exhaust gas charge in the manifold and the pressure corresponding to the fresh charge in the intake manifold.

It can be seen that the device for determining the fresh charge in the engine cylinder described in Figure 3 can accurately calculate the fresh charge in the engine cylinder by determining the target parameters used to calculate the cylinder and inputting the target parameters into the charge determination model for analysis. The air intake volume is conducive to reducing the combustion gas temperature of the cylinder combustion chamber and is conducive to the engine's fuel injection control, precise control of torque and air-fuel ratio, and is conducive to the full combustion of fuel in the combustion chamber, reducing the causes of insufficient fuel combustion. The generation of harmful gases and the suppression of engine knocking are beneficial to improve the fuel economy of the engine within the entire operating range.

In an optional embodiment, the predetermined charge determination model includes a predetermined pressure determination model and a predetermined charge calculation model. And, as shown in Figure 4, the acquisition module 302 obtains the target parameters corresponding to the cylinder according to the parameters corresponding to the engine and the predetermined charge determination model, specifically as follows:

According to the first sub-parameter and the pressure determination model, the parameters corresponding to the cylinder of the engine are obtained when the intake valve is closed. The parameters corresponding to the cylinder include the pressure corresponding to the cylinder and the temperature in the cylinder. The pressure corresponding to the cylinder includes the fresh charge in the cylinder. The pressure corresponding to the quantity, the pressure corresponding to the exhaust gas charge inside the cylinder, and the pressure corresponding to the exhaust gas charge outside the cylinder;

According to the second sub-parameter and the charge calculation model, the target parameters corresponding to the cylinder are obtained;

In this optional embodiment, the first sub-parameter includes the closing angle of the intake valve, the closing angle of the exhaust valve, the temperature of the intake manifold of the engine, the pressure of the intake manifold, and the gas group of the intake manifold. points, the pressure corresponding to the exhaust gas charge of the intake manifold and the pressure corresponding to the fresh charge of the intake manifold;

In this optional embodiment, the second sub-parameters include parameters corresponding to the cylinder, the temperature of the intake manifold, the pressure of the intake manifold, the gas composition of the intake manifold, and the lambda value.

It can be seen that the implementation of the device for determining the fresh charge in the engine cylinder described in Figure 3 can also first obtain the parameters corresponding to the cylinder through the pressure determination model, and then combine the parameters corresponding to the cylinder with other parameters and the charge calculation model to obtain the target corresponding to the cylinder Parameters, such as the total mass of fresh charge in the cylinder, can further improve the efficiency and accuracy of obtaining the target parameters corresponding to the cylinder.

In another optional embodiment, based on the device for determining the fresh charge in the engine cylinder described in Figure 3, the determination module 301 includes a determining unit 3011 and an acquisition unit 3012. At this time, the fresh charge in the engine cylinder The device for determining the fresh charge can be as shown in Figure 4. Figure 4 is a schematic structural diagram of a device for determining the fresh charge in another engine cylinder, where:

The determination unit 3011 is used to determine the gas mass flow rate of the engine's throttle valve.

The determination unit 3011 is also used to determine the parameters corresponding to the compressor of the engine's turbocharger. The parameters corresponding to the compressor include the gas mass flow rate of the compressor, the gas composition of the compressor, the temperature of the air outlet of the compressor, The pressure at the air outlet of the compressor;

The determination unit 3011 is also used to determine the parameters corresponding to the air outlet of the mixing chamber of the engine. The parameters corresponding to the air outlet of the mixing chamber include the gas EGR rate of the mixed gas after the exhaust gas and fresh air are mixed, the gas mass flow rate of the mixed gas, and Gas components of a gas mixture.

The acquisition unit 3012 is used to obtain the parameters corresponding to the intake manifold based on the gas mass flow rate of the throttle, parameters corresponding to the compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model. The corresponding parameters include the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and the gas composition of the intake manifold.

It can be seen that the device for determining the fresh charge in the engine cylinder described in Figure 4 can be implemented by obtaining the gas mass flow rate of the throttle, the parameters corresponding to the compressor, and the parameters corresponding to the air outlet of the mixing chamber, combined with the delay model. The time required for the gas EGR rate of the mixed gas to be transmitted 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 and improve the acquisition efficiency.

In yet another optional embodiment, as shown in Figure 4 , the acquisition unit 3012 obtains based on the gas mass flow rate of the throttle, parameters corresponding to the compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model. The parameters corresponding to the intake manifold are specifically as follows:

According to the third sub-parameter and the predetermined delay model, obtain the first sub-time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the throttle, the gas EGR rate of the throttle, and the gas composition of the throttle;

According to the fourth sub-parameter and the delay model, obtain the 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;

In this optional embodiment, the third sub-parameter includes parameters corresponding to the compressor and the parameters corresponding to the gas outlet of the mixing chamber; the fourth sub-parameter includes the gas mass flow rate of the throttle valve, the gas EGR rate of the throttle valve, and the gas EGR rate of the throttle valve. The gas composition of the valve; the time required for the gas EGR rate of the mixed gas 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 implementing the device for determining the fresh charge in the engine cylinder described in Figure 4 can use the delay model in stages, which can increase the gas EGR rate of the throttle valve required for transmission from the throttle valve to the intake manifold. sub-time, the EGR rate of the intake manifold and the acquisition efficiency and accuracy of the gas components of the intake manifold, thereby improving the pressure corresponding to the exhaust gas charge of the intake manifold and the fresh charge of the intake manifold The accuracy of obtaining the pressure can further improve the accuracy of obtaining the total mass of fresh charge in the cylinder.

In yet another optional embodiment, as shown in Figure 4, the way in which the determination unit 3011 determines the parameters corresponding to the air outlet of the mixing chamber is specifically as follows:

Determine the parameters corresponding to the air outlet of the mixing valve of the engine. The parameters corresponding to the air outlet of the mixing valve include the air mass flow rate of the air outlet of the mixing valve, the air composition of the air outlet of the mixing valve, and the temperature of the air outlet of the mixing valve;

Determine the parameters corresponding to the EGR valve of the engine. The parameters corresponding to the EGR valve include the pressure of the air inlet of the EGR valve, the pressure of the air outlet of the EGR valve, the temperature of the air inlet of the EGR valve, and the opening of the EGR valve;

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 chamber are obtained.

It can be seen that the implementation of the device for determining the fresh charge in the engine cylinder described in Figure 4 can also obtain the parameters corresponding to the air outlet of the mixing chamber by obtaining the parameters corresponding to the EGR valve and combined with the mixing model; and by obtaining The calibration operation is performed on the parameters corresponding to the air outlet of the mixing chamber, which can improve the acquisition accuracy of the parameters corresponding to the air outlet of the mixing chamber, which is beneficial to improving the acquisition accuracy of the parameters corresponding to the intake manifold, which is beneficial to improving the freshness in the cylinder. The accuracy of obtaining the total mass of charge can further achieve precise control of the engine's fuel injection control, torque and air-fuel ratio.

In yet another optional embodiment, the parameters corresponding to the above-mentioned EGR valve also include the temperature of the air outlet of the EGR valve, and the above-mentioned predetermined mixing model includes a predetermined sub-mixing model and a predetermined first mass flow rate. Computational model. And, as shown in Figure 4, the way in which the determination unit 3011 obtains the parameters corresponding to the air outlet of the mixing chamber based on the fourth target parameter and the predetermined mixing model is specifically:

According to the parameters corresponding to the EGR valve and the first mass flow calculation model, the parameters corresponding to the air outlet of the EGR valve are obtained. The parameters corresponding to the air outlet of the EGR valve include the EGR mass flow rate of the air outlet of the EGR valve and the air outlet of the EGR valve. EGR gas components;

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, the parameters corresponding to the air outlet of the mixing chamber are obtained.

It can be seen that implementing the device for determining the fresh charge in the engine cylinder described in Figure 4 can also first obtain the parameters of the air outlet of the EGR valve through the mass flow calculation model, and combined with the mixing model, can improve the parameters corresponding to the air outlet of the mixing chamber. acquisition efficiency and accuracy.

In yet another optional embodiment, as shown in Figure 4 , the manner in which the determination unit 3011 determines the gas mass flow rate of the engine's throttle is specifically as follows:

The sensor based on the throttle collects the parameters corresponding to the throttle. The parameters corresponding to the throttle include the pressure of the air inlet of the throttle, the temperature of the air inlet of the throttle, the pressure of the air outlet of the throttle and the pressure of the throttle. the opening;

According to the parameters corresponding to the throttle and the predetermined second mass flow calculation model, the gas mass flow of the throttle is obtained.

It can be seen that the implementation of the device for determining the fresh charge in the engine cylinder described in Figure 4 can also achieve the acquisition of the gas mass flow rate of the throttle valve by collecting parameters corresponding to the throttle valve and combining it with the mass flow rate determination model.

Embodiment 3

Please refer to FIG. 5 . FIG. 5 is another device for determining the fresh charge in the engine cylinder disclosed in an embodiment of the present invention. The device for determining the fresh charge in the engine cylinder described in FIG. 5 is applicable to the engine control system described in FIG. 1 . As shown in Figure 5, the device for determining the fresh charge in the engine cylinder may include:

Memory 501 storing executable program code;

processor 502 coupled to memory 501;

Further, it may also include an input interface 503 and an output interface 504 coupled with the processor 502;

The processor 502 calls the executable program code stored in the memory 501 to execute the steps of the method for determining the fresh charge in the engine cylinder described in Embodiment 1.

Embodiment 4

An embodiment of the present invention discloses a computer-readable storage medium that stores a computer program for electronic data exchange, wherein the computer program causes the computer to execute the steps of the method for determining the fresh charge in the engine cylinder described in Embodiment 1. .

Embodiment 5

The embodiment of the present invention discloses a computer program product. The computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause the computer to execute the engine cylinder described in Embodiment 1. Determination of fresh charge.

The device embodiments described above are only illustrative. The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they may be located in One place, or it can be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Persons of ordinary skill in the art can understand and implement the method without any creative effort.

Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions can be embodied in the form of software products in essence or in part that contribute to the existing technology. The computer software products can be stored in computer-readable storage media, and the storage media includes read-only memories. (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 (ErasableProgrammable Read Only Memory, EPROM) , One-time Programmable Read-Only Memory (OTPROM), Electronically Erasable Programmable Read-Only Memory (EEPROM), CompactDisc Read-Only Memory , CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

Finally, it should be noted that the method and device for determining the fresh charge in the engine cylinder disclosed in the embodiments of the present invention are only preferred embodiments of the present invention and are only used to illustrate the technical solution of the present invention. It is not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that they can still modify the technical solutions recorded in the foregoing embodiments, or modify some of the technical features thereof. Equivalent substitutions are made; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (12)

1. A method for determining the fresh charge in an engine cylinder, characterized in that the method includes: Determine the parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, and the temperature of the intake manifold. and said intake manifold pressure; According to the parameters corresponding to the intake manifold and the predetermined pressure calculation model, obtain 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 first sub-parameter and the predetermined pressure determination model, parameters corresponding to the cylinder of the engine are obtained when the intake valve is closed. The parameters corresponding to the cylinder include the pressure corresponding to the cylinder and the temperature in the cylinder. ; The first sub-parameter includes the closing angle of the intake valve, the closing angle of the exhaust valve, the temperature of the intake manifold of the engine, the pressure of the intake manifold, the intake manifold The gas composition, 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 second sub-parameter and the predetermined charge calculation model, the target parameter corresponding to the cylinder is obtained; the second sub-parameter includes the parameter corresponding to the cylinder, the temperature of the intake manifold, the intake The pressure of the air manifold, the gas composition of the intake manifold and the lambda value of the exhaust gas discharged from the cylinder of the engine, the target parameter corresponding to the cylinder at least includes the total mass of fresh charge in the cylinder; The parameters corresponding to the engine include parameters corresponding to the intake manifold, the closing angle of the intake valve of the engine, the closing angle of the exhaust valve of the engine, and the exhaust gas discharged from the cylinder of the engine. The lambda value, the pressure corresponding to the exhaust gas charge of the intake manifold, and the pressure corresponding to the fresh charge of the intake manifold. 2. The method for determining the fresh charge in the engine cylinder according to claim 1, wherein the pressure corresponding to the cylinder includes the pressure corresponding to the fresh charge in the cylinder, the exhaust gas charge in the cylinder. The pressure corresponding to the amount and the pressure corresponding to the exhaust gas charge outside the cylinder. 3. The method for determining the fresh charge in the engine cylinder according to claim 1, characterized in that the determination of parameters corresponding to the intake manifold of the engine includes: Determine the gas mass flow rate of the throttle valve of the engine, and determine the parameters corresponding to the compressor of the turbocharger of the engine. The parameters corresponding to the compressor include the gas mass flow rate of the compressor, the compressor The gas composition, the temperature of the gas outlet of the compressor, and the pressure of the gas outlet of the compressor; Determine the parameters corresponding to the air outlet of the mixing chamber of the engine. The parameters corresponding to the air outlet of the mixing chamber include the gas EGR rate of the mixed gas after the exhaust gas and fresh air are mixed, the gas mass flow rate of the mixed gas, and the gas mass flow rate of the mixed gas. Gas components of mixed gases; According to the gas mass flow rate of the throttle, the parameters corresponding to the compressor, the parameters corresponding to the air outlet of the mixing chamber, and the predetermined delay model, the parameters corresponding to the intake manifold are obtained. Parameters corresponding to the gas manifold include the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and the gas EGR rate of the intake manifold. Gas components. 4. The method for determining the fresh charge in the engine cylinder according to claim 3, characterized in that the gas mass flow rate according to the throttle, the parameters corresponding to the compressor, and the outlet of the mixing chamber are The parameters corresponding to the air port and the predetermined delay model are used to obtain the parameters corresponding to the intake manifold, including: According to the third sub-parameter and the predetermined delay model, the first sub-time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the throttle valve, the gas EGR rate of the throttle valve, and The gas composition of the throttle; According to the fourth sub-parameter and the delay model, 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 is obtained and the gas composition of the intake manifold; Wherein, the third sub-parameter includes parameters corresponding to the compressor and the parameters corresponding to the gas outlet of the mixing chamber; the fourth sub-parameter includes the gas mass flow rate of the throttle valve, the gas mass flow rate of the throttle valve EGR rate and the gas composition of the throttle; the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the intake manifold is the first sub-time and the second sub-time The sum of time. 5. The method for determining the fresh charge in the engine cylinder according to claim 3 or 4, characterized in that determining the parameters corresponding to the air outlet of the mixing chamber of the engine includes: Determine the parameters corresponding to the air outlet of the mixing valve of the engine. The parameters corresponding to the air outlet of the mixing valve include the air mass flow rate of the air outlet of the mixing valve, the air composition of the air outlet of the mixing valve, the The temperature of the air outlet of the mixing valve; Determine the parameters corresponding to the EGR valve of the engine. The parameters corresponding to the EGR valve include the pressure of the air inlet of the EGR valve, the pressure of the air outlet of the EGR valve, and the temperature of the air inlet of the EGR valve. And the opening of the EGR valve; 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 chamber are obtained. 6. The method for determining the fresh charge in the engine cylinder according to claim 5, wherein the parameters corresponding to the EGR valve also include the temperature of the air outlet of the EGR valve, the predetermined mixing The model includes a predetermined submixing model and a predetermined first mass flow calculation model; Wherein, obtaining the parameters corresponding to the air outlet of the mixing chamber based on the parameters corresponding to the air outlet of the mixing valve, the parameters corresponding to the EGR valve and the predetermined mixing model include: According to the parameters corresponding to the EGR valve and the first mass flow calculation model, the parameters corresponding to the air outlet of the EGR valve are obtained. The parameters corresponding to the air outlet of the EGR valve include the EGR of the air outlet of the EGR valve. Mass flow rate and EGR gas composition at the gas outlet of the EGR valve; 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, the parameters corresponding to the air outlet of the mixing chamber are obtained. 7. The method for determining the fresh charge in the engine cylinder according to claim 3, 4 or 6, wherein the determining the gas mass flow rate of the throttle valve of the engine includes: A sensor based on the throttle collects parameters corresponding to the throttle. The parameters corresponding to the throttle include the pressure of the air inlet of the throttle, the temperature of the air inlet of the throttle, the The pressure of the air outlet and the opening of the throttle valve; The gas mass flow rate of the throttle valve is obtained according to the parameters corresponding to the throttle valve and the predetermined second mass flow rate calculation model. 8. A device for determining fresh charge in an engine cylinder, characterized in that the device includes a determination module and an acquisition module, wherein: The determination module is used to determine parameters corresponding to the intake manifold of the engine. The parameters corresponding to the intake manifold include the EGR rate of the intake manifold, the gas composition of the intake manifold, the the temperature of the intake manifold and the pressure of the intake manifold; The acquisition module is used to obtain the pressure corresponding to the exhaust gas charge of the intake manifold and the fresh charge of the intake manifold according to the parameters corresponding to the intake manifold and a predetermined pressure calculation model. The pressure corresponding to the quantity; The acquisition module is also used to obtain the parameters corresponding to the cylinder of the engine when the intake valve is closed based on the first sub-parameter and the predetermined pressure determination model. The parameters corresponding to the cylinder include the parameters corresponding to the cylinder. pressure and the temperature in the cylinder; the first sub-parameter includes the closing angle of the intake valve, the closing angle of the exhaust valve, the temperature of the intake manifold of the engine, the temperature of the intake manifold pressure, the gas composition of the intake manifold, 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 according to the second sub-parameter and the predetermined The charging calculation model is calculated to obtain the target parameters corresponding to the cylinder; the second sub-parameters include the parameters corresponding to the cylinder, the temperature of the intake manifold, the pressure of the intake manifold, the The gas composition of the intake manifold and the lambda value of the exhaust gas discharged from the cylinder of the engine, and the target parameter corresponding to the cylinder at least includes the total mass of fresh charge in the cylinder; The parameters corresponding to the engine include parameters corresponding to the intake manifold, the closing angle of the intake valve of the engine, the closing angle of the exhaust valve of the engine, and the exhaust gas discharged from the cylinder of the engine. The lambda value, the pressure corresponding to the exhaust gas charge of the intake manifold, and the pressure corresponding to the fresh charge of the intake manifold. 9. The device for determining the fresh charge in the engine cylinder according to claim 8, wherein the pressure corresponding to the cylinder includes the pressure corresponding to the fresh charge in the cylinder, the exhaust gas charge in the cylinder. The pressure corresponding to the amount and the pressure corresponding to the exhaust gas charge outside the cylinder. 10. The device for determining the fresh charge in the engine cylinder according to claim 8 or 9, characterized in that the determination module includes a determination unit and an acquisition unit, wherein: The determination unit is used to determine the gas mass flow rate of the throttle valve of the engine; The determination unit is also used to determine parameters corresponding to the compressor of the turbocharger of the engine. The parameters corresponding to the compressor include the gas mass flow rate of the compressor, the gas composition of the compressor, The temperature of the air outlet of the compressor and the pressure of the air outlet of the compressor; The determination unit is also used to determine parameters corresponding to the air outlet of the mixing chamber of the engine. The parameters corresponding to the air outlet of the mixing chamber include the gas EGR rate of the mixed gas after the exhaust gas and fresh air are mixed, the mixing The gas mass flow rate of the gas and the gas components of the mixed gas; The acquisition unit is configured to obtain the intake manifold according to the gas mass flow rate of the throttle, parameters corresponding to the compressor, parameters corresponding to the air outlet of the mixing chamber, and a predetermined delay model. The corresponding parameters of the intake manifold include the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the intake manifold, the EGR rate of the intake manifold, and The gas composition of the intake manifold. 11. The device for determining the fresh charge in the engine cylinder according to claim 10, wherein the acquisition unit determines the fresh charge in the engine cylinder according to the gas mass flow rate of the throttle, parameters corresponding to the compressor, and the mixing chamber. The parameters corresponding to the air outlet and the predetermined delay model are obtained. The specific method of obtaining the parameters corresponding to the intake manifold is: According to the third sub-parameter and the predetermined delay model, the first sub-time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the throttle valve, the gas EGR rate of the throttle valve, and The gas composition of the throttle; According to the fourth sub-parameter and the delay model, 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 is obtained and the gas composition of the intake manifold; Wherein, the third sub-parameter includes parameters corresponding to the compressor and the parameters corresponding to the gas outlet of the mixing chamber; the fourth sub-parameter includes the gas mass flow rate of the throttle valve, the gas mass flow rate of the throttle valve EGR rate and the gas composition of the throttle; the time required for the gas EGR rate of the mixed gas to be transmitted from the mixing chamber to the intake manifold is the first sub-time and the second sub-time The sum of time. 12. A device for determining the fresh charge in an engine cylinder, characterized in that the determining device includes: Memory that stores executable program code; a processor coupled to said memory; The processor calls the executable program code stored in the memory to execute the method for determining the fresh charge in the engine cylinder according to any one of claims 1-7.