WO2020132921A1

WO2020132921A1 - Engine throttle valve control method and system

Info

Publication number: WO2020132921A1
Application number: PCT/CN2018/123780
Authority: WO
Inventors: 王文霞; 曹石; 宋国梁
Original assignee: 潍柴动力股份有限公司
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-07-02
Also published as: CN113167180A; RU2770365C1

Abstract

An engine throttle valve control method, the engine comprising a first throttle valve and a first branch pipe, the first throttle valve being arranged in the first branch pipe, and the control method comprising: on the basis of a first required air intake amount of the first branch pipe and the pressure at the front and rear two sides of the first throttle valve, determining a first degree of openness of the first throttle valve (S100); controlling the degree of openness of the first throttle valve to be the first degree of openness (S200); acquiring the actual air intake amount of the first branch pipe when the degree of openness of the first throttle valve is the first degree of openness (S300); on the basis of the difference between the actual air intake amount and the first required air intake amount, correcting the first degree of openness to obtain a second degree of openness (S400); and controlling the degree of openness of the first throttle valve to be the second degree of openness (S500). Also disclosed is an engine throttle valve control system. Controlling the degree of openness of the engine throttle valve by means of the present control method and control system enables the actual air intake amount of the engine to always reach the required air intake amount of the engine, so that the engine runs normally.

Description

Engine throttle valve control method and system

Technical field

The invention relates to the field of engine design, in particular to an engine throttle control method and system.

Background technique

As a machine that can convert other forms of energy into mechanical energy, the engine is widely used in the fields of automobiles, airplanes, and ships. No matter what field the engine is used in, the engine must be able to run normally.

For example, an engine powered by natural gas is mainly pre-mixed with natural gas and air, and then pressurized by a supercharger, so that the mixed gas of natural gas and air passes through the engine pipeline and the throttle valve in the pipeline. It enters the engine and burns to generate power.

However, in actual use, the actual supercharging effect of the supercharger often fails to reach the theoretical supercharging effect. At the same time, due to the leakage and blockage of the engine piping itself, the actual intake of the mixed gas entering the engine will not reach To maintain the engine's normal intake air intake, which affects the engine's output power and drive shaft torsional vibration. Therefore, how to ensure that the actual intake air volume entering the engine always reaches the required intake air volume during engine operation has become a problem that technicians need to solve urgently.

Summary of the invention

In view of the above problems, the present invention is proposed to provide an engine throttle control method and system that overcome the above problems or at least partially solve the above problems. The technical solutions are as follows:

An engine throttle control method. The engine includes a first throttle valve and a first branch pipe. The first throttle valve is disposed in the first branch pipe. The method includes:

Determine the first opening degree of the first throttle valve according to the first required intake air quantity of the first branch pipe and the pressure on both sides of the first throttle valve;

Controlling the opening degree of the first throttle valve to be the first opening degree;

Obtaining that the opening degree of the first throttle valve is the actual intake air amount of the first branch pipe at the first opening degree;

Modify the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

Controlling the opening degree of the first throttle valve to the second opening degree.

Optionally, before the determining the first opening degree of the first throttle valve according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve, the method Also includes:

Determine the total required intake charge according to the engine speed and the required torque;

According to the total demand intake air charge, determine the total demand intake air volume;

The first required intake air amount is determined according to the total required intake air amount and the number of branch pipes included in the engine.

Optionally, the determining the total required intake air amount according to the total required intake air charge includes:

The total required intake charge is converted into the total required intake according to the displacement of the engine and the rotational speed.

Optionally, the obtaining the opening degree of the first throttle valve as the actual intake air amount of the first branch pipe at the first opening degree includes:

When the opening degree of the first throttle valve is the first opening degree, detecting the actual pressure of the branch pipe;

According to the intake air temperature of the branch pipe, the actual pressure of the branch pipe and the displacement of the engine, determine that the opening of the first throttle valve is the actual intake air amount of the branch pipe at the first opening degree .

Optionally, the correcting the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain the second opening degree includes:

Obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

The second opening degree is obtained according to the first opening degree and the corrected opening degree.

An engine throttle control system, the engine includes a first throttle valve and a first branch pipe, the first throttle valve is disposed in the first branch pipe, the system includes: a first determination unit, a first control unit , A first obtaining unit, a first correcting unit and a second control unit,

The first determining unit is configured to determine the first opening degree of the first throttle valve according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve;

The first control unit is configured to control the opening degree of the first throttle valve to be the first opening degree;

The first obtaining unit is configured to obtain the actual intake air amount of the first branch pipe when the opening degree of the first throttle valve is the first opening degree;

The first correction unit is configured to correct the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

The second control unit is configured to control the opening degree of the first throttle valve to be the second opening degree.

Optionally, the system further includes: a second determination unit, a third determination unit, and a fourth determination unit,

The second determining unit is configured to determine, in the first determining unit, the first throttle valve according to the first required intake air quantity of the first branch pipe and the pressures on both sides of the first throttle valve Before the first opening, determine the total required intake charge according to the engine speed and the required torque;

The third determining unit is configured to determine a total required intake air amount according to the total required intake air charge;

The fourth determining unit is configured to determine the first required intake air amount based on the total required intake air amount and the number of branch pipes included in the engine.

Optionally, the third determining unit is specifically configured to convert the total required intake air charge to the total required intake air according to the displacement of the engine and the rotation speed.

Optionally, the first obtaining unit includes: a first detecting subunit and a first determining subunit,

The first detection subunit is configured to detect the actual pressure of the branch pipe when the opening of the first throttle valve is the first opening;

The first determining subunit is configured to determine the opening degree of the first throttle valve as the first opening degree according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe and the displacement of the engine The actual intake air volume of the branch pipe at the time.

Optionally, the first modification unit includes: a first obtaining subunit and a second obtaining subunit,

The first obtaining subunit is used to obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

The second obtaining subunit is configured to obtain the second opening degree according to the first opening degree and the modified opening degree.

With the above technical solution, the present invention provides an engine throttle control method and system. The engine includes a first throttle valve and a first branch pipe. The first throttle valve is disposed in the first branch pipe, and can be based on The first required intake air quantity of the first branch pipe and the pressure on both sides of the first throttle valve determine the first opening degree of the first throttle valve; controlling the opening degree of the first throttle valve is The first opening; obtaining the opening of the first throttle valve as the actual intake air quantity of the first branch pipe at the first opening angle; according to the actual intake air quantity and the first demand The difference in air volume corrects the first opening degree to obtain a second opening degree; the opening degree of the first throttle valve is controlled to the second opening degree. The invention can control the opening of the throttle valve of the engine, so that the actual intake air volume of the engine always reaches the required intake air volume of the engine, thereby enabling the normal operation of the engine.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more obvious and understandable The specific embodiments of the present invention are listed below.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, without paying any creative labor, other drawings may be obtained based on these drawings.

1 shows a flowchart of an engine throttle control method provided by an embodiment of the present invention;

2 shows a flowchart of another engine throttle control method provided by an embodiment of the present invention;

FIG. 3 shows a flowchart of another engine throttle control method provided by an embodiment of the present invention;

4 shows a flowchart of another engine throttle control method provided by an embodiment of the present invention;

FIG. 5 shows a flowchart of another engine throttle control method provided by an embodiment of the present invention;

6 shows a flowchart of another engine throttle control method provided by an embodiment of the present invention;

7 shows a schematic diagram of two-dimensional MAP calibration in an engine throttle control method provided by an embodiment of the present invention;

8 shows a schematic structural diagram of an engine throttle control system provided by an embodiment of the present invention;

9 shows a schematic structural diagram of another engine throttle control system provided by an embodiment of the present invention;

FIG. 10 shows a schematic structural diagram of another engine throttle control system provided by an embodiment of the present invention.

detailed description

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

As shown in FIG. 1, an engine throttle control method provided by an embodiment of the present invention, the engine may include a first throttle valve and a first branch pipe, the first throttle valve is disposed in the first branch pipe, the Methods can include:

S100. Determine the first opening degree of the first throttle valve according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve;

Among them, the branch pipe is the intake line after the throttle valve and before the intake port of the cylinder head. Its function is to distribute the air and fuel mixture from the throttle to the intake port of each cylinder.

The throttle is a controllable valve that controls the gas entering the engine. In the test, different throttle openings are set according to the amount of intake air required by the engine to achieve different output power. For example, under ideal conditions, to achieve an engine output of 50 kilowatts, set the throttle opening to 15 degrees to achieve the required intake air intake; to achieve an engine output of 80 kilowatts, set the throttle The opening degree is 30 degrees to reach the corresponding demand intake. Specifically, the pressures on the front and rear sides of the first throttle valve can be measured by pressure sensors respectively provided on the front and rear sides of the first throttle valve. Of course, they can also be obtained through other methods, and the invention is not limited herein.

The process of obtaining the first required intake air quantity of the first branch pipe in the present invention will be described in detail below:

Optionally, based on the method shown in FIG. 1, as shown in FIG. 2, another engine throttle control method provided by an embodiment of the present invention may include step S001, step S002, and step S003 before step S100:

S001. Determine the total required intake charge according to the engine speed and the required torque;

Specifically, the rotation speed of the engine can be obtained by a rotation speed sensor in the engine.

The method of obtaining the required torque may include:

First, through formula 1, calculate the engine power P,

P = (N _Eng V _Eng p)/30t formula one

Among them, N _Eng is the engine speed rpm, V _Eng is the engine displacement L, p is the average pressure in the cylinder MPa, t is the engine stroke, 4 stroke t=4, 2 stroke t=2.

Then substitute the power P into formula two to calculate the required torque M,

P＝N _Eng *M/9550 formula two

Among them, M is the required torque N*m.

Demand torque is a specific indicator that the engine has reached a certain degree of acceleration.

Specifically, according to the correspondence between the engine speed, the required torque and the total required intake charge, when the engine speed and the required torque are known, the total required intake charge of the engine can be obtained.

Optionally, according to the correspondence between the engine speed, the required torque and the total required intake air charge in an ideal state, a MAP map is pre-calibrated. When you need to know the total required intake charge of the engine, you can query it in the pre-calibrated MAP according to the engine speed and the required torque. As shown in Figure 7, the two input quantities are known as x and y. The value of the third related variable z can be found based on the internal calibration data of the MAP map. z1 can be obtained through x1 and y5, and z2 can be obtained through x2 and y5. , And so on, the corresponding values of z1 to z25 can be obtained by the value of the x-axis and the value of the y-axis. For example, if the total required intake charge is x1 and the engine speed is y5, then looking at the MAP map shows that the required torque is z1.

The pre-calibrated MAP map is only one of the forms, and may also be a correspondence table, etc., which is not further limited here.

S002. Determine the total required intake air amount according to the total required intake air charge;

Optionally, based on the method shown in FIG. 2 and shown in FIG. 3, another engine throttle control method provided by an embodiment of the present invention, step S002 may be specifically step S0021:

S0021: Convert the total required intake air charge to the total required intake air according to the displacement of the engine and the rotational speed;

Among them, the charge is also called the charge coefficient, which is the ratio of the mass of fresh air actually sucked into the cylinder per cycle and the theoretically calculated air mass filled with the working volume of the cylinder under the intake state.

by

r ₁ = m ₁ /m ₀ formula three

Among them, r ₁ is the total required intake air charge, m ₁ is the total required intake air amount, and m ₀ is the intake air volume that fills the cylinder in a theoretical state.

m ₀ =ρ*(N _Eng /2)*V _Eng formula four

Where ρ is the intake gas density and V _Eng is the engine displacement L.

Available

m ₁ = r ₁ *ρ*(N _Eng /2)*V _Eng formula 5

According to Formula 5, the total required intake air charge can be converted to the total required intake air charge.

In an embodiment of the present invention, the intake gas may be a mixture of air and fuel gas, and the intake gas density may be obtained by multiplying the ratio of air density and fuel gas density by a weighting factor.

S003. Determine the first required intake air amount according to the total required intake air amount and the number of branch pipes included in the engine.

Wherein, the first required intake air amount is equal to the total required intake air amount divided by the number of the branch pipes. For example, if the engine has two branch pipes, then the required intake air quantity of each branch pipe is half of the total required intake air quantity, that is, the intake air quantity of each branch pipe is the same. In practical applications, the number of branch pipes of the engine will be in one In the above, the intake air volume of each branch pipe is made uniform to avoid problems such as unstable output power of the engine and torsional vibration of the drive shaft due to the imbalance of the intake air of the engine.

Specifically, in actual use, the inventor of the present application learned through the throttle principle that when the fluid flows through the throttle valve, the pressure difference between the front and rear sides of the throttle valve is proportional to the square of the intake air amount of the fluid. According to Bernoulli's equation, it is known that there is a certain relationship between the fluid intake volume and the throttle diameter and the pressure difference between the front and rear sides of the throttle. The throttle diameter is related to the throttle opening.

The Bernoulli equation is:

Among them: Q _m can be the intake air flow, that is, the mass of the throttle valve per unit time, the unit is kg/s; c is the outflow coefficient, which represents the relationship between the actual flow rate and the theoretical flow rate through the device; β is the diameter ratio , That is, the diameter ratio of the actual flow cross section of the throttle valve to the cross section of the intake pipe; ε is the expansion coefficient; d is the flow diameter of the throttle member in m; Δp is the difference between the pressure before and after the throttle valve; ρ is the inlet Gas density.

Specifically, according to the correspondence between the intake air amount, the pressure difference between the front and rear sides of the throttle valve, and the throttle opening degree, when the intake air amount and the pressure difference between the front and rear sides of the throttle valve are known, the section can be obtained The opening of the valve at this time.

Optionally, a MAP map is pre-calibrated according to the correspondence between the intake air volume, the pressure difference between the front and rear sides of the throttle valve, and the throttle valve opening under ideal conditions. When it is necessary to know the throttle opening at a certain moment, according to the intake air amount at this moment and the pressure difference between the front and rear sides of the throttle, it can be inquired in the pre-calibrated MAP map. As shown in Figure 7, the two input quantities are known as x and y. According to the internal calibration data of the MAP diagram, the value of the third related variable z can be found. z1 can be obtained by x1 and y5, and z2 can be obtained by x2 and y5. , And so on, the corresponding values of z1 to z25 can be obtained by the value of the x-axis and the value of the y-axis. For example, if the first required intake air volume is x5, and the pressure difference between the front and rear sides of the first throttle valve is y1, then looking at the MAP map shows that the first opening degree of the throttle valve is z25.

S200. Control the opening degree of the first throttle valve to the first opening degree;

S300. Obtain the actual intake air amount of the first branch pipe when the opening degree of the first throttle valve is the first opening degree;

Optionally, based on the method shown in FIG. 1, as shown in FIG. 4, another engine throttle control method provided by an embodiment of the present invention, step S300 may include step S310 and step S320:

S310. When the opening degree of the first throttle valve is the first opening degree, detect the actual pressure of the branch pipe;

S320. Determine, according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe, and the displacement of the engine, the opening of the first throttle valve is the actual inlet of the branch pipe at the first opening degree Gas volume.

Specifically, by

r ₂ =m ₂ /m ₀ Formula 7

Where r ₂ is the intake air charge of the branch pipe, m ₂ is the actual intake air charge of the branch pipe, and m ₀ is the intake air charge of the cylinder in the theoretical state.

r ₂ =m ₂ /m ₀ =(p ₂ /p ₀ )*k _T formula eight

Among them, p ₂ is the actual pressure, p ₀ is the intake pressure that fills the cylinder in the theoretical state, k _T is the temperature correction coefficient, and the value range is 0.8 to 1.3.

Available

m ₂ =m ₀ *(p ₂ /p ₀ )*k _T =ρ*(N _Eng /2)*V _Eng *k _T *k _P formula 9

Among them, k _p = p ₂ / p ₀ , k _P is the pressure correction coefficient, and the value range is 0.5 to 2.

According to formula 8, the actual intake air amount of the branch pipe can be obtained according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe, and the displacement of the engine.

S400. Correct the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

Optionally, based on the method shown in FIG. 1, as shown in FIG. 5, another engine throttle control method provided by an embodiment of the present invention, step S400 may include step S410 and step S420,

S410. Obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

Specifically, by pre-calibrating the parameters of the PID controller, the difference between the actual intake air volume and the first required intake air volume is multiplied by the parameters of the pre-calibrated PID controller, and then added to obtain the correction angle Under normal circumstances, the pre-calibration is the proportional parameter and integral parameter in the PID controller, and the differential parameter is calibrated to 0. PID controller, that is, proportional-integral-derivative controller, is composed of proportional unit, integral unit and differential unit. PID controllers are mainly suitable for systems that are basically linear and whose dynamic characteristics do not change with time.

In order to facilitate the understanding of the parameters of the pre-calibrated PID controller, here is an example: the first required intake air volume is 100kg/h, the actual intake air volume is only 90kg/h, and the calibrated proportional parameter is 1%. The correction angle is 10% of the first opening. If the intake air after the first opening plus the corrected opening is too large under actual verification, then modify the proportional parameter to 0.5%. Perform actual verification until calibration The correction angle obtained by the proportional parameter of can finally make the actual intake air amount reach the first required intake air amount. The calibration of integral parameters is the same.

S420. Obtain the second opening degree according to the first opening degree and the corrected opening degree.

When the actual intake air amount is greater than the first required intake air amount, the first opening degree is subtracted from the corrected opening degree to obtain the second opening degree. When the actual intake air volume is less than the first required intake air volume, the first opening degree is added to the corrected opening degree to obtain the second opening degree.

S500. Control the opening degree of the first throttle valve to the second opening degree.

It can be understood that when the engine has multiple branch pipes, the required intake air amount of each branch pipe is the same. When the actual intake air amount is not equal to the required intake air amount, each branch pipe will be corrected according to its actual situation. To control its own throttle, the throttle opening of each branch can be different, but it is guaranteed that the actual intake air volume is the same as the required intake air volume. For example: when the required intake air volume of each branch pipe is A, in theory, the throttle opening of each branch pipe is B, but when the throttle opening of the A branch pipe is B, the actual intake air is caused for some reason. The quantity cannot reach the required intake air quantity. Through step S400, the throttle opening of the A-branch is added to the corrected opening C, and the actual intake air quantity can reach the required intake air quantity, so at this time, the throttle opening of the A-branch is B plus C, while the other branch Because the actual intake air volume is the same as the required intake air volume, the throttle opening of the other branch pipe is still B.

Optionally, as shown in FIG. 6, another engine throttle control method provided by an embodiment of the present invention includes:

S003: Determine the first required intake air amount according to the total required intake air amount and the number of branch pipes included in the engine;

S320. Determine, according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe, and the displacement of the engine, the opening of the first throttle valve is the actual inlet of the branch pipe at the first opening degree Gas volume

S420. Obtain the second opening degree according to the first opening degree and the modified opening degree;

The above steps S001 to S500 have been described in the foregoing embodiments, please refer to the foregoing embodiments, and no further description will be given.

According to the present invention, the first opening of the first throttle valve can be determined according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve; The opening degree is the first opening degree; the actual intake air amount of the first branch pipe is obtained; the first opening degree is performed according to the difference between the actual intake air amount and the first required intake air amount Corrected to obtain the second opening; controlling the opening of the first throttle to the second opening. The invention can control the opening of the throttle valve of the engine, so that the actual intake air volume of the engine always reaches the required intake air volume of the engine, so that the engine runs normally.

Corresponding to the above method embodiments, the present invention also provides an engine throttle control system.

As shown in FIG. 8, an embodiment of the present invention provides an engine throttle control system. The engine includes a first throttle valve and a first branch pipe. The first throttle valve is disposed in the first branch pipe. The system may include: a first determination unit 100, a first control unit 200, a first obtaining unit 300, a first correction unit 400, and a second control unit 500,

The first determining unit 100 is configured to determine the first opening degree of the first throttle valve according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve;

The throttle is a controllable valve that controls the gas entering the engine. In the test, different throttle openings are set according to the amount of intake air required by the engine to achieve different output power. For example, in an ideal situation, to achieve an engine output of 50 kilowatts, set the throttle opening to 15 degrees to achieve the required intake air volume; to achieve an engine output of 80 kilowatts, set the throttle The opening degree is 30 degrees to reach the corresponding demand intake. Specifically, the pressures on the front and rear sides of the first throttle valve can be measured by pressure sensors respectively provided on the front and rear sides of the first throttle valve. Of course, they can also be obtained through other methods, and the invention is not limited herein.

The first control unit 200 is configured to control the opening degree of the first throttle valve to be the first opening degree;

The first obtaining unit 300 is configured to obtain the actual intake air amount of the first branch pipe when the opening degree of the first throttle valve is the first opening degree;

The first correction unit 400 is configured to correct the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

The second control unit 500 is configured to control the opening degree of the first throttle valve to be the second opening degree.

Optionally, based on the system shown in FIG. 8, as shown in FIG. 9, another engine throttle control system provided by an embodiment of the present invention, the system may further include: a second determination unit 600, a third determination unit 700 and the fourth determining unit 800,

The second determining unit 600 is configured to determine, in the first determining unit 100, the first section according to the first required intake air amount of the first branch pipe and the pressures on both sides of the first throttle valve Before the first opening of the valve, the total required intake charge is determined according to the engine speed and the required torque;

The third determining unit 700 is configured to determine a total required intake air amount according to the total required intake air charge;

The fourth determining unit 800 is configured to determine the first required intake air amount according to the total required intake air amount and the number of branch pipes included in the engine.

Optionally, in another engine throttle control system provided by an embodiment of the present invention, the third determining unit 700 may be specifically used to charge the total demand intake air according to the displacement of the engine and the rotational speed The quantity is converted into the total required intake air quantity.

Optionally, based on the system shown in FIG. 8, as shown in FIG. 10, another engine throttle control system provided by an embodiment of the present invention, the first obtaining unit 300 may include: a first detection subunit 310 And the first determining subunit 320,

The first detection subunit 310 is configured to detect the actual pressure of the branch pipe when the opening degree of the first throttle valve is the first opening degree;

The first determining subunit 320 is configured to determine the opening degree of the first throttle valve as the first opening according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe and the displacement of the engine The actual intake air volume of the branch pipe at degrees.

Optionally, based on the system shown in FIG. 8, as shown in FIG. 10, another engine throttle control system provided by an embodiment of the present invention, the first correction unit 400 may include: a first obtaining subunit 410 And the second obtaining subunit 420,

The first obtaining subunit 410 is configured to obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

When the actual intake air amount is greater than the first required intake air amount, the first opening degree is subtracted from the corrected opening degree to obtain the second opening degree. When the actual intake air amount is less than the first required intake air amount, the first opening degree is added to the corrected opening degree to obtain the second opening degree.

The second obtaining subunit 420 is configured to obtain the second opening degree according to the first opening degree and the modified opening degree.

It should be noted that the embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments refer to each other. can. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method embodiment.

Finally, it should also be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities Or there is any such actual relationship or order between operations. Moreover, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also those not explicitly listed Or other elements that are inherent to this process, method, article, or equipment. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, article or equipment that includes the element.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made. These improvements and retouches also It should be regarded as the protection scope of the present invention.

Claims

An engine throttle control method, characterized in that the engine includes a first throttle valve and a first branch pipe, the first throttle valve is disposed in the first branch pipe, and the method includes:

Determine the first opening degree of the first throttle valve according to the first required intake air quantity of the first branch pipe and the pressure on both sides of the first throttle valve;

Controlling the opening degree of the first throttle valve to be the first opening degree;

Obtaining that the opening degree of the first throttle valve is the actual intake air amount of the first branch pipe at the first opening degree;

Modify the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

Controlling the opening degree of the first throttle valve to the second opening degree.
The method according to claim 1, characterized in that, based on the first required intake air quantity of the first branch pipe and the pressures on both sides of the first throttle valve, the first throttle valve is determined Before the first opening, the method further includes:

Determine the total required intake charge according to the engine speed and the required torque;

According to the total demand intake air charge, determine the total demand intake air volume;

The first required intake air amount is determined according to the total required intake air amount and the number of branch pipes included in the engine.
The method according to claim 2, wherein the determining the total required intake air amount according to the total required intake air charge includes:

The total required intake charge is converted into the total required intake according to the displacement of the engine and the rotational speed.
The method according to claim 1, wherein the obtaining the opening degree of the first throttle valve as the actual intake air amount of the first branch pipe at the first opening degree includes:

When the opening degree of the first throttle valve is the first opening degree, detecting the actual pressure of the branch pipe;

According to the intake air temperature of the branch pipe, the actual pressure of the branch pipe and the displacement of the engine, determine that the opening of the first throttle valve is the actual intake air amount of the branch pipe at the first opening degree .
The method according to claim 1, wherein the first opening degree is corrected to obtain a second opening degree according to the difference between the actual intake air amount and the first required intake air amount ,include:

Obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

The second opening degree is obtained according to the first opening degree and the corrected opening degree.
An engine throttle control system, characterized in that the engine includes a first throttle valve and a first branch pipe, the first throttle valve is disposed in the first branch pipe, the system includes: a first determination unit, A first control unit, a first obtaining unit, a first correction unit and a second control unit,

The first determining unit is configured to determine the first opening degree of the first throttle valve according to the first required intake air amount of the first branch pipe and the pressure on both sides of the first throttle valve;

The first control unit is configured to control the opening degree of the first throttle valve to be the first opening degree;

The first obtaining unit is configured to obtain the actual intake air amount of the first branch pipe when the opening degree of the first throttle valve is the first opening degree;

The first correction unit is configured to correct the first opening degree according to the difference between the actual intake air amount and the first required intake air amount to obtain a second opening degree;

The second control unit is configured to control the opening degree of the first throttle valve to be the second opening degree.
The system according to claim 6, wherein the system further comprises: a second determination unit, a third determination unit, and a fourth determination unit,

The second determining unit is configured to determine, in the first determining unit, the first throttle valve according to the first required intake air quantity of the first branch pipe and the pressures on both sides of the first throttle valve Before the first opening, determine the total required intake charge according to the engine speed and the required torque;

The third determining unit is configured to determine a total required intake air amount according to the total required intake air charge;

The fourth determining unit is configured to determine the first required intake air amount based on the total required intake air amount and the number of branch pipes included in the engine.
The system according to claim 7, wherein the third determining unit is specifically configured to convert the total required intake air charge to the total required input based on the displacement of the engine and the rotational speed Gas volume.
The system according to claim 6, wherein the first obtaining unit includes: a first detecting subunit and a first determining subunit,

The first detection subunit is configured to detect the actual pressure of the branch pipe when the opening of the first throttle valve is the first opening;

The first determining subunit is configured to determine the opening degree of the first throttle valve as the first opening degree according to the intake air temperature of the branch pipe, the actual pressure of the branch pipe and the displacement of the engine The actual intake air volume of the branch pipe at the time.
The system according to claim 6, wherein the first correction unit includes: a first obtaining subunit and a second obtaining subunit,

The first obtaining subunit is used to obtain a corrected opening degree according to the difference between the actual intake air amount and the first required intake air amount;

The second obtaining subunit is configured to obtain the second opening degree according to the first opening degree and the modified opening degree.