阅读说明：本技术 控制汽油排气再循环系统的阀门打开控制设备和方法 (Valve opening control apparatus and method for controlling gasoline exhaust gas recirculation system ) 是由 金汉相 于 2018-12-07 设计创作，主要内容包括：本公开涉及一种汽油排气再循环系统的阀门打开控制设备和方法。所述阀门打开控制设备包括：汽油发动机,所述汽油发动机通过燃烧产生驱动动力；进气管线,进气通过所述进气管线流入所述汽油发动机的燃烧室；排气管线,排气通过所述排气管线从燃烧室排出；再循环管线,所述再循环管线从所述排气管线分支出并连接到所述进气管线；EGR冷却器,所述EGR冷却器位于再循环管线中,冷却在所述进气管线中流动的排气；EGR阀,所述EGR阀被配置为控制在进气管线中流动的排气的量；紧急过滤器,所述过滤器位于EGR阀的一端；以及流速调节器,所述流速调节器被配置为根据所述EM过滤器的堵塞状态控制所述EGR阀的开度。(The present disclosure relates to a valve opening control apparatus and method of a gasoline exhaust gas recirculation system. The valve opening control apparatus includes: a gasoline engine that generates drive power by combustion; an intake line through which intake air flows into a combustion chamber of the gasoline engine; an exhaust line through which exhaust gases are discharged from the combustion chamber; a recirculation line branching off from the exhaust line and connected to the intake line; an EGR cooler located in the recirculation line that cools the exhaust gas flowing in the intake line; an EGR valve configured to control an amount of exhaust gas flowing in an intake line; an emergency filter located at one end of the EGR valve; and a flow rate regulator configured to control an opening degree of the EGR valve according to a clogging state of the EM filter.)

1. A valve opening control apparatus of a gasoline exhaust gas recirculation system, the valve opening control apparatus comprising:

a gasoline engine that generates drive power by combustion;

an intake line through which intake air flows into a combustion chamber of the gasoline engine;

an exhaust line through which exhaust gases are discharged from the combustion chamber;

a recirculation line branching off from the exhaust line and connected to the intake line;

an exhaust gas recirculation cooler located in the recirculation line and cooling exhaust gas flowing in the intake line;

an exhaust gas recirculation valve configured to control an amount of exhaust gas flowing in the intake line;

an emergency filter located in one end of the exhaust gas recirculation valve; and

a flow rate regulator configured to control an opening of the exhaust gas recirculation valve according to a clogging state of the emergency filter.

2. The valve opening control apparatus according to claim 1, wherein the flow rate regulator measures a clogging state of the emergency filter,

in response to determining that the degree of clogging of the emergency filter is smaller than a first reference value, the flow rate regulator is configured to maintain the opening degree of the exhaust gas recirculation valve in a first open state, and

in response to determining that the degree of clogging of the emergency filter is equal to or greater than the first reference value, the flow rate regulator is configured to correct the opening degree of the exhaust gas recirculation valve to be greater than the first open state.

3. The valve-opening control apparatus according to claim 2, wherein in response to a determination that the degree of clogging of the emergency filter is equal to or greater than the first reference value and less than a second reference value, and when correcting the opening degree of the exhaust gas recirculation valve, the flow rate adjuster is configured to control the opening degree of the exhaust gas recirculation valve to increase linearly according to the degree of clogging of the emergency filter.

4. The valve opening control apparatus according to claim 2, wherein in response to determining that the degree of clogging of the emergency filter is equal to or greater than a second reference value, and when correcting the opening degree of the exhaust gas recirculation valve, the flow rate adjuster is configured to correct the opening degree of the exhaust gas recirculation valve to have a second open state.

5. The valve-opening control apparatus according to claim 1, further comprising:

a differential pressure sensor configured to measure a clogging state of the emergency filter by measuring a pressure on the exhaust gas recirculation valve.

6. The valve opening control apparatus according to claim 1, wherein the flow rate regulator is configured to correct the opening degree of the exhaust gas recirculation valve when the number of revolutions of the gasoline engine is within a predetermined range.

7. The valve opening control apparatus according to claim 1, wherein the emergency filter is located between the exhaust gas recirculation valve and the exhaust gas recirculation cooler.

8. A valve opening control method of controlling an exhaust gas recirculation system, the valve opening control method comprising:

step a): determining a condition of engine load;

step b): determining, by a flow rate regulator, whether a clogging degree of an emergency filter is greater than a first reference value when the engine load is equal to or greater than a predetermined value in the step a);

step c): correcting the opening degree of the exhaust gas recirculation valve by the flow rate regulator when the clogging degree of the emergency filter is equal to or greater than the first reference value in the step b); and

step d): checking, by the flow rate regulator, a flow rate of exhaust gas flowing through the exhaust gas recirculation valve in a recirculation line based on the corrected opening of the exhaust gas recirculation valve.

9. The valve opening control method according to claim 8, further comprising:

in the step b), when the clogging degree of the emergency filter is equal to or greater than the first reference value, it is determined whether the clogging degree of the emergency filter is less than a second reference value.

10. The valve opening control method according to claim 9, wherein the step c) includes linearly increasing the opening degree of the exhaust gas recirculation valve according to the degree of clogging of the emergency filter when the degree of clogging of the emergency filter is equal to or greater than the first reference value and less than the second reference value.

11. The valve opening control method according to claim 9, wherein the step c) includes maintaining the opening degree of the exhaust gas recirculation valve in a second open state when the degree of clogging of the emergency filter is equal to or greater than the second reference value.

12. The valve opening control method according to claim 8, wherein the opening degree of the exhaust gas recirculation valve is maintained in the first open state when the clogging degree of the emergency filter is smaller than the first reference value.

13. The valve opening control method according to claim 8, wherein when the flow rate of the exhaust gas flowing through the exhaust gas recirculation valve in the recirculation line based on the corrected opening degree of the exhaust gas recirculation valve is smaller than a predetermined target amount, the step d) includes:

step d-1): determining whether a range of revolutions per minute of a vehicle engine changes; and

step d-2): in the step d-1), when the rpm range of the vehicle engine is changed, returning to the step a), and when the rpm range of the vehicle engine is not changed, additionally correcting the corrected opening degree of the exhaust gas recirculation valve.

14. The valve opening control method according to claim 8, wherein the step a) is performed by determining whether the condition of the engine load is within a range of engine rpm predetermined in a controller.

15. The valve opening control method according to claim 8, wherein checking the flow rate of the exhaust gas flowing in the recirculation line in the step d) includes: measuring a differential pressure applied across the exhaust gas recirculation valve using a differential pressure sensor across the exhaust gas recirculation valve.

Technical Field

The present disclosure relates generally to a valve opening control apparatus and method of controlling a gasoline Exhaust Gas Recirculation (EGR) system, and more particularly, to a valve opening control apparatus and method of controlling a gasoline EGR system, in which a flow rate of exhaust gas to flow in an intake line is controlled by controlling an opening degree of an EGR valve according to a clogging state of an Emergency (EM) filter fluidly connected to a recirculation line located at a rear end of a turbocharger in a gasoline engine vehicle including the gasoline EGR system.

Background

An engine of a vehicle generates power by mixing air introduced from the outside with fuel in an appropriate ratio and then combusting the mixture.

In the process of generating power by driving the engine, it is necessary to provide sufficient outside air for combustion in order to obtain desired output and combustion efficiency. For this reason, the turbocharger serves as a device for pressurizing combustion air to improve the combustion efficiency of the engine.

Generally, a turbocharger is a device that rotates a turbine using the pressure of exhaust gas discharged from an engine and then supplies high-pressure air to a combustion chamber by using the rotational force, thereby increasing the output of the engine. Turbochargers are suitable for use in diesel and gasoline engines.

In addition, an Exhaust Gas Recirculation (EGR) system is mounted on a vehicle to reduce harmful exhaust gas. Generally, NO is when the proportion of air in the mixer is high for adequate combustion_xIt will increase. Thus, an EGR system is a system that remixes a portion (e.g., 5% to 20%) of the exhaust gas discharged from the engine back into the mixer to reduce the amount of oxygen in the mixer and interfere with combustion, thereby inhibiting the generation of NO_x。

An EGR system of a gasoline engine is mounted on a vehicle to improve fuel efficiency. With the EGR system, pumping loss can be reduced in a low speed/low load region, and the ignition timing can be advanced by reducing the combustion chamber temperature in a medium speed/heavy load region, thereby improving the fuel efficiency of the vehicle.

Typical EGR systems used in gasoline engines include low pressure EGR systems. The low pressure EGR system recirculates exhaust gas passing through a turbocharger turbine to an intake passage at a front end of a compressor.

Further, low pressure EGR systems used in gasoline engines include an Emergency (EM) filter located at one end near the EGR valve to remove Particulate Material (PM) and carbon oxides or nitrogen oxides from exhaust gas flowing in the intake line.

That is, in the case of a gasoline engine vehicle using an EGR system, an EM filter is provided in a configuration for removing carbon oxides (carbon) or nitrogen oxides contained in exhaust gas at the time of exhaust gas flow.

However, the EGR system according to the related art is configured to be maintained at a certain opening degree without determining whether the EM filter is clogged due to carbon deposition. Therefore, there is a problem in that exhaust gas does not flow through the recirculation line into the intake line due to the degree of clogging of the EM filter.

Disclosure of Invention

The present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a valve opening control apparatus and method of a gasoline EGR system, in which a clogging state of an EM filter is measured, and an opening degree of an EGR valve is controlled according to a clogging degree.

An object of the present invention is to provide a valve opening control apparatus and method of a gasoline EGR system, in which the opening degree of an EGR valve is controlled in consideration of a load condition of a vehicle and a clogging state of an EM filter.

The object of the present invention is not limited to the above object, and other objects of the present invention not mentioned can be understood by the following description, and can be more clearly understood by the embodiments of the present invention. Further, the object of the present invention can be achieved by the devices shown in the claims and combinations thereof.

To achieve the above object, a valve opening control apparatus and method of a gasoline Exhaust Gas Recirculation (EGR) system is configured as follows.

The valve opening control apparatus of the EGR system includes: a gasoline engine that generates drive power by combustion; an intake line through which intake air flows into a combustion chamber of the gasoline engine; an exhaust line through which exhaust gases are discharged from the combustion chamber; a recirculation line branching off from the exhaust line and connected to the intake line; an EGR cooler located in the recirculation line that cools the exhaust gas flowing in the intake line; an EGR valve configured to control an amount of exhaust gas flowing in an intake line; an Emergency (EM) filter located at one end of the EGR valve; and a flow rate regulator configured to control an opening degree of the EGR valve according to a clogging state of the EM filter.

Additionally, a flow rate regulator may measure a clogging state of the EM filter. In response to determining that the degree of clogging of the EM filter is smaller than the first reference value, the flow rate regulator may be configured to maintain the opening degree of the EGR valve in the first open state. In response to determining that the degree of clogging of the EM filter is substantially equal to or greater than a first reference value, the flow rate regulator may be configured to correct the opening degree of the EGR valve to be greater than a first open state.

Further, in response to determining that the degree of clogging of the EM filter is substantially equal to or greater than the first reference value and less than the second reference value, and when correcting the opening degree of the EGR valve, the flow rate regulator may be configured to control the opening degree of the EGR valve to linearly increase according to the degree of clogging of the EM filter.

Further, in response to determining that the degree of clogging of the EM filter is substantially equal to or greater than a second reference value, and when correcting the opening degree of the EGR valve, the flow rate regulator may be configured to correct the opening degree of the EGR valve to have a second open state.

Additionally, the apparatus may further include a differential pressure sensor configured to measure a clogging state of the EM filter by measuring a pressure across the EGR valve.

Further, the flow rate regulator may be configured to correct the opening degree of the EGR valve when the number of revolutions of the engine is within a predetermined range.

Further, an EM filter may be located between the EGR valve and the EGR cooler.

Further, to achieve the above object, a valve opening control method of controlling an EGR system includes: a) determining a condition of engine load; b) determining, by the flow rate regulator, whether a clogging degree of the EM filter is greater than a first reference value when the engine load is equal to or greater than a predetermined value in step a); c) correcting the opening degree of the EGR valve by the flow rate regulator when the clogging degree of the EM filter is equal to or greater than the first reference value in step b); and d) checking, by the flow rate regulator, the flow rate of the exhaust gas flowing through the EGR valve in the recirculation line based on the corrected opening degree of the EGR valve.

Further, the method may further include determining whether the clogging degree of the EM filter is less than a second reference value when the clogging degree of the EM filter is equal to or greater than the first reference value in step b).

Further, the step c) may include linearly increasing the opening degree of the EGR valve according to the clogging degree of the EM filter when the clogging degree of the EM filter is equal to or greater than the first reference value and less than the second reference value.

Further, the step c) may include maintaining the opening degree of the EGR valve in the second open state when the degree of clogging of the EM filter is equal to or greater than a second reference value.

Further, when the degree of clogging of the EM filter is less than the first reference value, the opening degree of the EGR valve may be maintained in the first open state.

Further, when the flow rate of the exhaust gas flowing through the EGR valve in the recirculation line according to the corrected opening degree of the EGR valve is less than a predetermined target amount, the step d) may include: d-1) determining whether a range of Revolutions Per Minute (RPM) of an engine of the vehicle is changed; and d-2) returning to step a) when the RPM range of the vehicle engine is changed in step d-1), and additionally correcting the corrected opening degree of the EGR valve when the RPM range of the vehicle engine is not changed.

Further, the step a) may be performed by determining whether the condition of the engine load is within a range of engine RPM predetermined in the controller.

Furthermore, checking the flow rate of the exhaust gas flowing in the recirculation line in step d) may comprise: the differential pressure applied across the EGR valve is measured using a differential pressure sensor across the EGR valve.

According to the above-described embodiments, the configurations described below, and the combinations and use relationships, the present invention can obtain the following effects.

Since the opening degree of the EGR valve is controlled in consideration of the clogged state of the EM filter, the present invention has an effect that high fuel efficiency of the vehicle can be achieved even when the EM filter is clogged.

Further, the present invention has an effect of providing stable drivability since an output requested by the driver can be provided even when the EM filter is clogged.

Further, the present invention has the effect of maintaining the effective operation performance of the EGR system that performs feedback control according to the corrected opening degree of the EGR valve.

Drawings

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a configuration diagram showing an engine system equipped with a valve-opening control apparatus of a gasoline EGR system according to an embodiment of the present disclosure;

FIG. 2 is a block diagram of an engine system equipped with a valve opening control apparatus for a gasoline EGR system, according to an embodiment of the present disclosure;

FIG. 3 is a configuration diagram of a gasoline EGR system, according to an embodiment of the present disclosure;

fig. 4 is a graph showing a correction value for controlling the opening amount of an EGR valve in a valve opening control apparatus for a gasoline EGR system according to an embodiment of the present disclosure;

fig. 5 is a graph showing fuel efficiency comparison and estimation of a vehicle using a valve opening control apparatus of a gasoline EGR system according to an embodiment of the present disclosure;

FIG. 6 is a flowchart illustrating a method of controlling valve opening of a gasoline EGR system, according to an embodiment of the present disclosure; and

fig. 7 is a flowchart of a process of checking the exhaust gas flow rate in a valve opening control method of controlling a gasoline EGR system according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The embodiments of the present disclosure may be modified in various forms, and the scope of the present disclosure should not be construed as being limited to the following embodiments. This example is provided to more fully explain the present disclosure to those skilled in the art.

Also, the terms "means", "unit", "module", and the like described in the specification denote a unit for processing at least one function or operation, which may be implemented as hardware, software, or a combination of hardware and software.

Fig. 1 is a conceptual diagram showing the configuration of an engine system provided with an EGR system 100 (hereinafter referred to as "engine system") according to an embodiment of the present disclosure. Fig. 2 is a block diagram showing a configuration of an engine system according to an embodiment of the present disclosure.

As shown in fig. 1 and 2, an engine system according to an embodiment of the present disclosure includes an engine 20, a turbocharger 50, an Exhaust Gas Recirculation (EGR) system 100, a flow rate regulator 160, and a controller 200.

The engine 20 includes a plurality of combustion chambers 21 that generate driving force by combustion of fuel. The engine 20 is provided with: an intake line 10 through which intake air supplied to the combustion chamber 21 flows; and an exhaust line 30 through which exhaust gases discharged from the combustion chamber 21 flow.

The exhaust line 30 is provided with an exhaust aftertreatment device 40 for removing various harmful substances contained in the exhaust gas discharged from the combustion chamber 21. Embodiments of the present disclosure provide for using a pre-heat catalytic converter (WCC) aftertreatment device 40 to remove nitrogen oxides, carbon deposits, and Particulate Matter (PM) from the exhaust.

The turbocharger 50 compresses intake air (outside air and recirculated gas) flowing in through the intake line 10, and supplies the compressed air to the combustion chamber 21. The turbocharger 50 includes: a turbine 51 provided in the exhaust line 30 to be rotated by exhaust gas discharged from the combustion chamber 21; and a compressor 52, the compressor 52 rotating in cooperation with the turbine 51 to compress intake air.

The EGR system 100 includes a recirculation line 120, an EGR cooler 110, an EGR valve 140, an EM filter 130, and a flow rate regulator 160.

A recirculation line 120 branches off from the exhaust line 30 at the rear end of the turbocharger 50 and is connected to the intake line 10. The EGR cooler 110 is located in the recirculation line 120 and cools the recirculated gas (exhaust gas) flowing through the recirculation line 120. A flow rate regulator 160 is installed in the recirculation line 120 to regulate the amount of exhaust gas flowing through the recirculation line 120. That is, the flow rate regulator 160 is configured such that the opening degree of the EGR valve can be controlled in cooperation with the controller 200.

An EGR valve 140 capable of being opened and closed to control the flow rate of recirculated gas (exhaust gas) flowing into the EGR system 100 is disposed at one end of the EGR cooler 110, and an EM filter 130 for removing residual carbon oxides, nitrogen oxides, and PM contained in the recirculated gas (exhaust gas) is disposed at one end of the EGR valve 140.

That is, the EM filter 130 is configured to filter out foreign substances when components such as a catalyst are decomposed.

More preferably, a differential pressure sensor 150 is positioned across the EGR valve 140 or across the EM filter 130 to measure the pressure exerted on the EGR valve 140(EM filter) to determine the clogging status and degree of clogging of the EM filter 130. Further, the flow rate regulator 160 is configured to receive data regarding the clogging state and the clogging degree of the EM filter 130 to control the opening degree of the EGR valve 140.

More preferably, the flow rate regulator 160 of the present disclosure may use the controller 200 located in the vehicle, and may control the opening degree of the EGR valve 140 in consideration of Revolutions Per Minute (RPM) of the vehicle engine 20, a load applied to the vehicle, and the like, in addition to the clogged state and the clogged degree of the EM filter 130.

In one embodiment of the present disclosure, the EGR system 100 may be configured to operate with the engine 20 at 2000RPM minimum and 4000RPM maximum. Further, the EGR system 100, which is typically configured in a gasoline engine 20, is configured to operate more frequently when the engine 20 is at a low RPM than when it is at a high RPM. However, since the operation range of the EGR system 100 may be changed according to the driving region of the vehicle, the EGR system 100 may be operated within the rotation number range of the engine 20 predetermined in the controller 200 or the flow rate regulator 160.

The present disclosure is configured such that the clogging state of the EM filter 130 is determined within a rotational speed range of the engine 20 in which the EGR system 100 operates, whereby the flow rate regulator 160 may determine the clogging degree of the EM filter 130 by measuring the pressure applied to the EGR valve 140.

Fig. 3 illustrates a configuration of EGR system 100 located in recirculation line 120, according to an embodiment of the disclosure.

The recirculation line 120 branches off from the exhaust line 30 and connects to the intake line 10, configured to fluidly connect to the EGR cooler 110 and the EM filter 130. The EGR valve 140 is disposed at one end of the EGR cooler 110, and the EGR valve 140 can be opened and closed to control the flow rate of recirculated gas (exhaust gas). An EM filter 130 for removing residual carbon oxides, nitrogen oxides, and PM contained in the recirculated gas (exhaust gas) is disposed at least one end of the EGR valve 140.

More preferably, in one embodiment of the present disclosure, the EM filter 130 is located between the EGR cooler 110 and the EGR valve 140.

The flow rate regulator 160 of the present disclosure is configured to control the opening degree of the EGR valve 140 from the clogged state of the EM filter 130. In one embodiment, the differential pressure sensor 150 is configured to be positioned across the EGR valve 140 such that the clogging state and degree of clogging of the EM filter 130 may be determined based on the detection results of the differential pressure sensor 150. In another embodiment of the present disclosure, differential pressure sensor 150 may be configured to be positioned across EM filter 130.

The differential pressure sensor 150 as described above measures the differential pressure applied to the EGR valve 140(EM filter 130), and corrects the opening degree of the EGR valve 140 when the measured differential pressure is equal to or greater than a predetermined value.

Fig. 4 shows a correction value for controlling the opening degree of the EGR valve 140 according to the clogging degree of the EM filter 130 according to an embodiment of the present disclosure.

The EGR system 100 of the present disclosure is configured to operate while the rotational speed range of the engine 20 remains between 2000RPM and 4000RPM, such that the flow rate regulator 160 determines a clogged state of the EM filter 130 with the operation of the EGR system 100.

The flow rate regulator 160 is configured to compensate for the opening degree of the EGR valve 140 when the degree of clogging of the EM filter 130 is measured to be greater than a first reference value by the pressure measured by the differential pressure sensor 150. More preferably, the flow rate regulator 160 performs correction such that the opening degree of the EGR valve 140 is linearly increased in a state where the degree of clogging of the EM filter 130 is equal to or greater than the first reference value and less than the second reference value.

In summary, the flow rate regulator 160 is configured such that the EGR valve 140 maintains the first open state when the clogging degree of the EM filter 130 is less than the first reference value; when the clogging degree of the EM filter 130 is equal to or greater than the first reference value and less than the second reference value, the opening degree of the EGR valve 140 is linearly increased; and when the clogging degree of the EM filter 130 is equal to or greater than the second reference value, the EGR valve 140 maintains the second open state.

In an embodiment of the present disclosure, the first reference value represents a degree of clogging of the EM filter 130 of 30%, and the second reference value represents a degree of clogging of the EM filter 130 of 80%.

Further, in an embodiment of the present disclosure, the second reference value represents a clogging degree of the EM filter 130 of 65% under the condition of 4000RPM or more. In this case, the flow rate regulator 160 is configured to keep the EGR valve 140 in the second open state.

As described above, in the present disclosure, the first reference value and the second reference value may vary according to the load and the number of revolutions of the engine 20.

In addition, the second opening state is provided by doubling the opening degree of the EGR valve 140 as compared with the first opening state, and here, the second opening state may be the maximum opening state of the EGR valve 140.

However, in one embodiment of the present disclosure, the first and second open states described above may vary depending on the operating environment of the EGR system 100. Further, the correction value for controlling the opening degree of the EGR valve 140 may vary according to the clogging degree of the EM filter 130.

Fig. 5 is a graph showing fuel efficiency comparison and estimation of a vehicle by the valve opening control apparatus of the gasoline EGR system 100 of the present disclosure.

As shown, when the EGR valve is controlled to be maintained in the second open state by the valve opening control apparatus of the gasoline EGR system 100 according to the present disclosure with the EM filter 130 maintained at the second reference value (clogging greater than 80%), it has an effect that the fuel efficiency is improved by about 10% as compared to the EGR system 100 without the valve opening control apparatus of the gasoline EGR system 100.

As described above, the valve opening control apparatus of the gasoline EGR system 100 according to the present disclosure is configured such that the opening degree of the EGR valve 140 is controlled in the case where the EM filter 130 is clogged while the EGR system 100 is operating, thereby having the effect of improving the fuel efficiency of the vehicle.

Fig. 6 and 7 show a flowchart of a valve opening control method of controlling the gasoline EGR system 100 according to an embodiment of the present disclosure.

The valve opening control method of controlling the gasoline EGR system 100 according to the present disclosure includes the step of determining a load condition applied to the vehicle (step S100).

In the step of determining the load condition, the number of revolutions of the engine 20 and the amount of load applied to the engine 20 are determined. In one embodiment of the present disclosure, it is determined whether the number of revolutions of the engine 20 at which the EGR system 100 operates is 2000RPM to 4000 RPM.

In this step, when the load of the engine 20 is equal to or greater than a predetermined value, the flow rate regulator 160 determines whether the clogging state of the EM filter 130 is equal to or greater than a first reference value (step S200) to determine the clogging state and the clogging degree of the EM filter 130.

The clogging state and the clogging degree of the EM filter 130 may be determined by a pressure difference applied to the EGR valve 140 or the EM filter 130. Accordingly, when the EM filter 130 is determined to be equal to or greater than the first reference value, a pressure difference equal to or greater than the reference pressure stored in the controller 200 is generated.

The method includes correcting an opening degree of the EGR valve 140 by the flow rate regulator 160 when a clogging state and a clogging degree of the EM filter 130 are equal to or greater than a first reference value (exhaust gas) (step S300), and checking a flow rate of the recirculated gas (exhaust gas) flowing in the intake line 10 along the recirculation line 120 according to the corrected opening degree (step S400).

In step S400 of checking the flow rate of the recirculated gas (exhaust gas), since the EGR gas temperature sensor is located between the EGR cooler 110 and the exhaust line 30, the flow rate of the recirculated gas flowing through the recirculation line 120 can be measured by measuring the temperature of the recirculated gas flowing in the exhaust stage of the EGR cooler 100.

Further, in the step of determining the clogging state of the EM filter 130 through the flow rate regulator 160, when the clogging degree of the EM filter 130 is equal to or greater than the first reference value, it is determined whether the clogging degree of the EM filter 130 is less than the second reference value (step S200).

That is, the method is configured such that when the clogging degree of the EM filter 130 is smaller than the first reference value, the EGR valve 140 maintains the first open state; when the clogging degree of the EM filter 130 is equal to or greater than the first reference value and less than the second reference value, the opening degree of the EGR valve 140 is linearly increased; and when the clogging degree of the EM filter 130 is equal to or greater than the second reference value, the EGR valve 140 maintains the second open state.

The opening degree of the EGR valve 140 may be corrected according to a map stored in the controller 200 of the vehicle, or the correction value may be calculated by the flow rate regulator 160 and the controller 200 based on the differential pressure measured by the differential pressure sensor 150.

A step of checking the flow rate of the recirculated gas (exhaust gas) flowing in the recirculation line 120 according to the corrected opening degree of the EGR valve 140 is performed (step S400). When the differential pressure measured in the differential pressure sensor 150 is substantially equal to the predetermined value (step S410), the opening degree of the EGR valve 140 is maintained (step S411), and the logic ends (step S412).

When the differential pressure measured by the differential pressure sensor 150 is not substantially equal to the predetermined value (step S410), it is determined whether the RPM during the running of the vehicle has changed (step S420). When the RPM during the running of the vehicle is changed (step S421), the opening degree of the EGR valve 140 is maintained (step S421), and the load condition applied to the vehicle at the initial stage is measured (step S100).

However, when the differential pressure measured by the differential pressure sensor 150 is not substantially equal to the predetermined value (step S410) and the RPM during the running of the vehicle is not changed (step S420), the opening degree of the EGR valve 140 is additionally corrected (step S422), and it is determined whether the differential pressure measured by the differential pressure sensor 150 is substantially equal to the predetermined value (step S410).

As described above, with the valve opening control method of controlling the gasoline EGR system 100 of the present disclosure, the opening degree of the EGR valve 140 is controlled in consideration of the driving condition of the vehicle and the clogging state of the EM filter 130, and the amount of recirculated gas (exhaust gas) flowing in the recirculation line 120 is controlled to increase according to the corrected opening degree of the valve 140.

Controller 200 and/or flow regulator 160 may include a processor, memory, and/or storage coupled to the processor. The processor may be a Central Processing Unit (CPU) or a semiconductor device that processes instructions stored in a memory and/or storage. Each of the memory and storage may include various types of volatile or non-volatile storage media. For example, memory may include Read Only Memory (ROM) and Random Access Memory (RAM). Accordingly, the operations of a method or algorithm described in connection with the embodiments disclosed in the specification may be embodied directly in a hardware module, in a software module, or in a combination of the hardware and software modules executed by a processor. A software module may reside on a non-transitory or transitory storage medium (i.e., memory and/or storage) such as RAM, flash memory, ROM, erasable programmable ROM (eprom), electrically eprom (eeprom), registers, a hard disk, a removable disk, or a compact disk ROM (CD-ROM). A storage medium may be coupled to the processor. The processor may read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC).

The foregoing detailed description illustrates the present disclosure. Moreover, the foregoing is intended to illustrate and explain preferred embodiments of the disclosure, and the disclosure may be used in various other combinations, modifications, and environments. That is, changes or modifications may be made within the scope of the concepts disclosed in the present specification, equivalents of the present disclosure, and/or the scope of the technology or knowledge of the present disclosure. The described embodiments are intended to explain the best mode for carrying out the technical idea of the disclosure and may be variously changed in specific application and use of the disclosure. Therefore, the detailed description of the disclosure is not intended to limit the disclosure to the disclosed embodiments. It is also to be understood that the appended claims are intended to cover further embodiments.