WO2018182247A1

WO2018182247A1 - Evaporation gas purge control device and method for internal combustion engine

Info

Publication number: WO2018182247A1
Application number: PCT/KR2018/003481
Authority: WO
Inventors: 박한용; 임종석; 김도완
Original assignee: 콘티넨탈 오토모티브 시스템 주식회사
Priority date: 2017-03-27
Filing date: 2018-03-23
Publication date: 2018-10-04
Also published as: KR20180109268A; KR101910406B1

Abstract

The present invention relates to an evaporation gas purge control device and method for an internal combustion engine, the device comprising: a turbocharger including a turbine rotated by exhaust gas discharged from an engine, and a compressor rotated by the turbine so as to compress intake gas to be supplied to the engine; a canister for collecting evaporation gas generated in a fuel tank; a canister purge valve for switching the flow of evaporation gas collected in the canister to any one of an intake manifold of the engine and the front end of the compressor so as to purge the evaporation gas; a differential pressure generation valve for generating differential pressure between the pressure of the front end of the compressor and atmospheric pressure; and a control unit for controlling a switching operation of the canister purge valve depending on whether an exhaust gas recirculation (EGR) mode for recirculating exhaust gas is activated, and whether the differential pressure generation valve is operated, so as to perform control such that evaporation gas collected in the canister is purged through any one of the intake manifold and the front end of the compressor.

Description

Apparatus and method for controlling evaporative gas purge of internal combustion engine

The present invention relates to an apparatus and method for controlling an evaporative gas purge of an internal combustion engine, and more particularly, to an apparatus and a method for controlling an evaporative gas purge of an internal combustion engine for controlling purge of fuel evaporated gas collected in a canister.

In general, in an internal combustion engine equipped with a turbocharger, a turbine of a turbocharger is installed in an exhaust line, and a compressor of a turbocharger is installed in an intake line. The turbine is rotated by the internal energy of the exhaust gas discharged from the engine, and the compressor is rotated by the turbine to compress the intake gas guided through the intake line. Accordingly, the compressed suction gas is supplied to each cylinder of the internal combustion engine, thereby improving the thermal efficiency of the internal combustion engine, and effectively increasing the engine output per unit displacement of the internal combustion engine.

Recently, internal combustion engines equipped with turbochargers are provided with low pressure exhaust gas recirculation (EGR) devices. The low-pressure EGR device is a device that recycles a part of the exhaust gas to a confluence part formed on the upstream side of the compressor provided on the intake line from a branch formed on the downstream side of the turbine provided on the exhaust line, and mixes a part of the exhaust gas with the intake gas. . As a result, generation of nitrogen oxides and generation of pumping losses can be suppressed while increasing turbo efficiency.

On the other hand, fuels such as gasoline and diesel in fuel tanks inevitably generate evaporated gas due to increased ambient temperature and negative pressure in the fuel system, and when such evaporated gas is released into the atmosphere, there is a problem of polluting the atmosphere. do. Accordingly, the internal combustion engine of the vehicle is configured to collect the boil-off gas generated in the fuel tank through the canister and supply the combustion engine to the engine when the engine is stopped. The inside of the canister is filled with activated carbon. When the engine is stopped, the canister absorbs and collects the evaporated gas generated from the fuel tank through the activated carbon. Then, when the engine is restarted and the vehicle starts running, the vaporized gas collected in the canister is returned to the engine by the engine negative pressure. Supplied.

At this time, in the case of the internal combustion engine equipped with the turbocharger, since the pressure of the intake manifold is very high in the supercharge operation region, there is a problem that it is not easy to purge the boil-off gas collected in the canister through the intake manifold. As a result, air pollution due to leakage of the boil-off gas occurs.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-1998-0036338 (published on August 05, 1998).

The present invention has been made to solve the above-mentioned problems, an object according to an aspect of the present invention is the evaporation of the internal combustion engine for effectively purging the boil-off gas collected in the canister in the supercharge operation region of the internal combustion engine equipped with a turbocharger It is to provide a gas purge control device and method.

An apparatus for controlling evaporation gas purge of an internal combustion engine according to an aspect of the present invention includes a turbine that rotates by exhaust gas discharged from an engine, and a compressor that rotates by the turbine and compresses a suction gas supplied to the engine. A turbocharger, a canister for collecting the evaporated gas generated from the fuel tank, a canister purge valve for converting and purging the evaporated gas collected in the canister to any one of the intake manifold of the engine and the front end of the compressor, and the pressure of the front end of the compressor. And controlling the switching of the canister purge valve according to whether a differential pressure generation valve for generating a differential pressure between atmospheric pressures and an Exhaust Gas Recirculation (EGR) mode for recirculating the exhaust gas and an operation of the differential pressure generation valve are controlled. Boil-off gas collected in the canister is discharged from the intake manifold and the comp. Characterized in that a control unit for controlling such that the purge of any one of a front end of the stand.

According to an aspect of the present invention, the present invention in the internal combustion engine equipped with the EGR system and the turbocharger is difficult to purge the evaporated gas through the intake manifold to form a negative pressure of the compressor front through the differential pressure generating valve to ensure that the evaporated gas is By purging to the front of the compressor, it is possible to effectively purge the boil-off gas collected in the canister.

1 is a configuration diagram for explaining an evaporative gas purge control device of an internal combustion engine according to an embodiment of the present invention.

2 is an exemplary view for explaining a process of purging the boil-off gas to the compressor front end in the boil-off gas purge control device of the internal combustion engine according to an embodiment of the present invention.

3 is a flowchart illustrating a method of controlling an evaporative gas purge of an internal combustion engine according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating a process of controlling the purge of the boil-off gas in the method of controlling the boil-off gas purge of the internal combustion engine according to an embodiment of the present invention.

In the present invention, the control unit, when the EGR mode is activated to operate the differential pressure generation valve, the canister purge valve so that the boil-off gas is purged to the place where a greater negative pressure is formed in the front end of the intake manifold and the compressor. It is characterized by controlling the switching.

In the present invention, the differential pressure generating valve in which the EGR mode is activated and operated has an opening degree for forming a negative pressure at the front end of the compressor required for recirculation of the exhaust gas.

In the present invention, the control unit is a case where the greater negative pressure is formed during the front end of the intake manifold and the compressor when the differential pressure generating valve is operated in accordance with a predetermined differential pressure generating valve operating condition when the EGR mode is deactivated. By controlling the switching of the canister purge valve to purge the boil-off gas.

In the present invention, the differential pressure generating valve operating condition is the differential pressure for forming the opening and closing conditions of the differential pressure generating valve determined based on the load ratio of the engine, and the negative pressure at the front end of the compressor required for purging the boil-off gas. It is characterized by including the opening degree information of the generation valve.

In the present invention, the control unit, characterized in that for controlling the switching of the canister purge valve to purge the boil-off gas to the intake manifold, when the differential pressure generation valve does not operate.

According to an aspect of the present invention, there is provided a method for controlling an evaporation gas purge of an internal combustion engine, including: determining, by the controller, whether purge of the evaporated gas collected in the canister is necessary; The canister purge valve depends on whether the Exhaust Gas Recirculation (EGR) mode is activated for the recirculation of the exhaust gas discharged from the air, and whether the differential pressure generating valve generates a differential pressure between the pressure of the front end of the compressor and the atmospheric pressure of the compressor provided in the turbocharger. And controlling the switching so that the boil-off gas collected in the canister is purged to any one of the intake manifold of the engine and the front end of the compressor.

In the controlling step, the control unit, when the EGR mode is activated to operate the differential pressure generation valve, the evaporation gas is purged to a place where a greater negative pressure is formed in the front end of the intake manifold and the compressor. And controlling the switching of the canister purge valve as much as possible.

According to the present invention, in the controlling step, the control unit may further include a front end of the intake manifold and the compressor when the differential pressure generating valve is operated according to a preset differential pressure generating valve operating condition when the EGR mode is deactivated. And controlling the switching of the canister purge valve to purge the boil-off gas to a place where a large negative pressure is formed.

In the controlling of the present invention, the control unit controls the switching of the canister purge valve to purge the boil-off gas to the intake manifold when the differential pressure generating valve is inoperative.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a boil-off gas purge control device and method of an internal combustion engine according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram illustrating an apparatus for controlling an evaporative gas purge of an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a compressor front end in an apparatus for controlling an evaporative gas purge of an internal combustion engine according to an embodiment of the present invention. Exemplary diagram for explaining a process in which the boil-off gas is purged.

As shown in FIG. 1, the turbocharger TURBOCHARGER is a turbine TURBINE that is rotated by the exhaust gas discharged from the engine ENGINE, and a suction gas that is rotated by the turbine TURBINE and supplied to the engine ENGINE. Compressor to compress the. That is, the turbine TURBINE is installed on the exhaust line 40, and the compressor is installed on the intake line 30. Meanwhile, in the present embodiment, the engine ENGINE may be implemented as a gasoline engine or a diesel engine, and is not limited to a specific type of engine.

The intake line 30 is provided with an air cleaner AIRCLEANER, an INTERCOOLER, and a throttle valve THROTTLE_VALVE together with a compressor. The AIRCLEANER removes solid particulate matter such as dust contained in air introduced from the outside. The INTERCOOLER is compressed by a compressor to expand the intake gas having a high temperature to cool the intake gas. The opening degree of the throttle valve THROTTLE_VALVE is controlled by the controller ECU to be described later in order to adjust the amount of intake gas supplied to the engine ENGINE.

An exhaust gas recirculation (EGR) line is installed in communication with the exhaust line 40 and the intake line 30. Specifically, the EGR line 50 is installed in communication between the front end side intake line 30 of the compressor from the rear end side exhaust line 40 of the turbine TURBINE. Accordingly, the EGR line 50 recirculates some of the exhaust gas discharged from the engine ENGINE to the intake line 30 on the front side of the compressor so as to be mixed with the intake gas. On the EGR line 50, an EGR valve ERG_VALVE is provided to control the amount of exhaust gas recycled through the EGR line 50 by opening and closing the EGR line 50 under the control of the control unit ECU.

The differential pressure generation valve DPV is provided on the intake line 30. The differential pressure generating valve DPV is installed on the intake line 30 connecting between the air cleaner AIRCLEANER and the front end of the compressor, and in the normal driving state of the engine ENGINE, FIG. As shown in the above), the pressure of the front end of the compressor is maintained at atmospheric pressure by maintaining the open state, and when the EGR mode is activated or purge of the evaporated gas collected in the canister is required, as will be described later. 2 (b) and 2 (c), the opening degree is adjusted to generate a differential pressure between the pressure of the front end of the compressor and the atmospheric pressure (that is, to form a negative pressure at the front end of the compressor). ) Play a role. A detailed description of the operation of the differential pressure generation valve DPV will be given later.

Canister captures the boil-off gas from the fuel tank. As described above, when the engine is stopped, the evaporated gas generated from the fuel tank is absorbed and collected through activated carbon filled in the canister, and when the engine is started again, the engine starts to run. It is supplied to the engine by the negative pressure and burned. One side of the canister is formed with an inlet for the inflow of external air. Accordingly, the evaporated gas adsorbed to the activated carbon inside the canister is easily separated from the activated carbon through the outside air introduced into the canister. Can be. On the other hand, the canister (CANISTER) is connected to the fuel delivery module and the fuel tank pressure sensor (FDM (Fuel Delivery Module) & TPS (Tank Pressure Sensor)).

The canister CANISTER is connected to the intake manifold through the first purge line 10 and is connected to the front end of the compressor through the second purge line 20. On the first and

second purge lines

10 and 20, check valves CHECK_VALVE for preventing backflow are installed. The canister purge valve (CPV) converts the boil-off gas collected in the canister to the first and

second purge lines

10 and 20 through any one of the intake manifold of the engine ENGINE and the front end of the compressor. Purge one. The canister purge valve (CPV) may be implemented as a solenoid valve.

The control unit ECU controls the switching of the canister purge valve CPV according to whether the EGR mode for exhaust gas recirculation is activated and whether the differential pressure generating valve DPV is operated, so that the evaporated gas collected in the canister is discharged. Control to purge to either the intake manifold or the front end of the compressor.

Based on the above structure, an operation process of the evaporative gas purge control device of the internal combustion engine according to the present embodiment will be described.

First, the control unit ECU determines whether a purge of the boil-off gas collected in the canister is required. That is, the control unit ECU first determines whether it is necessary to consume the boil-off gas collected in the canister, and for this purpose, the control unit ECU sets a predetermined pressure at which the pressure of the canister or the fuel tank is preset. It is possible to determine whether or not the purge of the boil-off gas is necessary by determining whether or not to reach, or whether the integrated value of the engine (ENGINE) stop time reaches a predetermined value.

If it is determined that purge of the boil-off gas is necessary, the control unit ECU determines whether the EGR mode for recirculating the exhaust gas is activated (that is, whether the current EGR valve (EGR_VALVE) is open to recycle the exhaust gas). Judging).

The meaning of the process of determining whether the EGR mode is activated will be explained. When the EGR mode is activated, the control unit ECU has an opening degree for forming a negative pressure at the front end of the compressor required for recirculation of the exhaust gas. Control the differential pressure generating valve (DPV). Through this, the exhaust gas is recycled through the EGR line 50, and at the same time, purging of the boil-off gas collected in the canister may be performed by utilizing the negative pressure of the front end of the compressor formed for the exhaust gas recycle. .

On the other hand, when the EGR mode is deactivated, since the exhaust gas is not recycled, the control unit ECU does not connect the negative pressure of the front end of the compressor required to recycle the exhaust gas to the canister. The differential pressure generation valve DPV is controlled to have an opening degree for forming a negative pressure at the front end of the compressor for purging the collected boil-off gas.

That is, in order to solve the difficulty of purging due to the pressure of the high intake manifold in the turbocharger turbocharger, the control unit ECU of the present embodiment operates the differential pressure generating valve DPV to operate the compressor. By forming the negative pressure of the front end, purge control is performed to induce the evaporation gas to be purged to the front end of the compressor, and the differential purge control according to the activation of the EGR mode in order to recirculate the exhaust gas and purge the boil off gas simultaneously. By performing the more effective purge of the boil-off gas can be made.

The process of purging the boil-off gas according to whether the EGR mode is activated will be described in more detail.

The control unit ECU compares the negative pressure of the intake manifold and the negative pressure of the front end of the compressor when the EGR mode is activated and the differential pressure generating valve DPV is operated. The switching of the canister purge valve (CPV) is controlled to purge.

That is, when the EGR mode is activated, the control unit ECU controls the differential pressure generating valve DPV to have an opening degree for forming a negative pressure at the front end of the compressor required for recycling the exhaust gas. In this case, the opening degree of the differential pressure generation valve DPV is an EGR-based opening degree, and may be determined according to a condition preset in the control unit ECU in consideration of the recycle amount of the exhaust gas.

When the EGR mode is activated and the differential pressure generating valve (DPV) is operated, recycling of the exhaust gas and purging of the boil-off gas are simultaneously performed as shown in FIG. 2 (b), that is, generating the differential pressure for recycling the exhaust gas. The purge of the boil-off gas may also be performed simultaneously by utilizing the negative pressure of the front end of the compressor formed by operating the valve DPV.

Next, when the differential pressure generating valve DPV is operated in accordance with a predetermined differential pressure generating valve operating condition when the EGR mode is deactivated, the control unit ECU controls the negative pressure of the intake manifold and the negative pressure of the front end of the compressor. The control of the canister purge valve (CPV) is controlled so that the boil-off gas is purged to a place where a greater negative pressure is formed.

Specifically, when the EGR mode is deactivated, it is not necessary to form a negative pressure at the front end of the compressor required for recirculation of the exhaust gas, and it is difficult to purge the evaporated gas due to the pressure of the high intake manifold under the turbocharge condition. In order to solve this problem, only negative pressure formation at the front end of the compressor for purging the boil-off gas to the front end of the compressor is required. To this end, the control unit ECU first determines whether the state of the current internal combustion engine satisfies a preset differential pressure generation valve operating condition. The differential pressure generating valve operating condition is a differential pressure generating valve for forming the opening and closing conditions of the differential pressure generating valve (DPV) determined based on the load ratio of the engine (ENGINE), and the negative pressure at the front end of the compressor required for purging the boil-off gas. (DPV) opening degree information is included.

Specifically, the control unit ECU determines whether to open or close the differential pressure generation valve DPV according to the load ratio of the engine ENGINE. When the engine is in the idle or low load state, the differential pressure generating valve (DPV) is actuated (closed) to create a negative pressure at the front of the compressor, which causes the engine stall. ), The control unit ECU does not operate the differential pressure generation valve. On the contrary, when the engine ENGINE is in a high load state, even if a negative pressure is generated at the front end of the compressor by operating the differential pressure generating valve DPV, in view of the operation of the compressor and the open state of the throttle valve THROTTLE_VALVE The engine ECU operates the differential pressure generating valve DPV because the engine stall is unlikely to occur.

When the differential pressure generating valve DPV is operated because the engine is in a high load state, the control unit ECU generates a negative pressure at the front end of the compressor required for purging the boil-off gas according to the differential pressure generating valve operating conditions. The differential pressure generating valve DPV is controlled to have an opening for In this case, the opening degree of the differential pressure generation valve DPV is a purge-based opening degree, and may be determined according to a condition preset in the control unit ECU in consideration of the purge amount of the boil-off gas.

When the differential pressure generating valve DPV is operated with the EGR mode deactivated, only purge of the evaporated gas is performed as shown in FIG. 2C, that is, even if the exhaust gas is not recycled, the differential pressure generating valve is performed. Depending on the operating conditions, the differential pressure generating valve DPV may be additionally operated to form a negative pressure at the front end of the compressor, thereby enabling more efficient purge of the evaporated gas.

In this embodiment, instead of operating the differential pressure generating valve DPV to purge the boil-off gas to the front end of the compressor uniformly, the differential pressure generating valve DPV is operated to form the negative pressure at the front end of the compressor. Then, an embodiment is employed in which the boil-off gas is purged to a place where a larger negative pressure is formed compared to the negative pressure of the intake manifold. Accordingly, more efficient purge control of the boil-off gas can be performed by controlling the boil-off gas to be purged through a flow path in which a high negative pressure is always formed in all the drive regions including the boost-drive region.

On the other hand, the control unit ECU controls switching of the canister purge valve CPV so that the boil-off gas is purged to the intake manifold when the differential pressure generation valve DPV does not operate.

Specifically, even when the EGR mode is activated, the differential pressure generating valve (DPV) may not operate according to the state of the internal combustion engine, and when the EGR mode is deactivated, the engine (ENGINE) may be in an idle or low load state. If present, the differential pressure generating valve DPV does not operate according to the aforementioned differential pressure generating valve operating conditions. When the differential pressure generating valve (DPV) does not operate as described above, since the pressure at the atmospheric pressure level is formed at the front of the compressor, it is not easy to purge the boil-off gas, so that the control unit ECU sends the boil-off gas to the intake manifold. The switching of the canister purge valve (CPV) is controlled to purge.

3 is a flowchart illustrating a method for controlling the evaporated gas purge of the internal combustion engine according to an embodiment of the present invention, Figure 4 is a purge of the evaporated gas in the method for controlling the evaporated gas purge of the internal combustion engine according to an embodiment of the present invention Is a flow chart for describing in detail the process that is controlled.

Referring to FIG. 3, a method of controlling an evaporative gas purge of an internal combustion engine according to an exemplary embodiment of the present invention will be described. First, the control unit ECU determines whether purge of the evaporated gas collected in the canister is necessary (S10). ). That is, the control unit ECU first determines whether it is necessary to consume the boil-off gas collected in the canister.

Subsequently, when the purge of the boil-off gas is required, the control unit ECU may activate an exhaust gas recirculation (EGR) mode for recirculating the exhaust gas discharged from the engine ENGINE, and a compressor provided in the turbocharger TURBOCHARGER. The control of the canister purge valve (CPV) is controlled according to the operation of the differential pressure generating valve (DPV), which generates the differential pressure between the pressure at the front of the compressor and the atmospheric pressure, and the evaporated gas collected in the canister is controlled by the engine. Control to be purged to any one of the inlet manifold and the front end of the compressor (COMPRESSOR) (S20).

Referring to Figure 4 will be described in more detail step S20.

When it is determined in step S10 that purge of the boil-off gas is necessary, the control unit ECU determines whether an exhaust gas recirculation (EGR) mode for recirculating the exhaust gas is activated (S21).

When it is determined in step S21 that the EGR mode is activated, the control unit ECU determines whether the differential pressure generation valve DPV is operating (S22).

If it is determined in step S22 that the differential pressure generation valve DPV is not in operation, since the pressure at the atmospheric pressure level is formed at the front of the compressor, it is not easy to purge the boil-off gas, so that the controller ECU controls the intake manifold. The switching of the canister purge valve (CPV) is controlled to purge the boil-off gas to the fold (S27).

When it is determined in step S22 that the differential pressure generation valve DPV is operating (in this case, the opening degree of the differential pressure generation valve DPV is an opening degree for forming a negative pressure at the front end of the compressor required for recycling the exhaust gas. The control unit ECU compares the negative pressure at the front end of the compressor to the negative pressure at the intake manifold (S23).

As a result of the comparison in step S23, the control unit ECU controls the switching of the canister purge valve CPV such that the evaporated gas is purged to the front of the compressor when the negative pressure at the front of the compressor is greater (S24). When the negative pressure of the intake manifold is greater, the switching of the canister purge valve is controlled so that the boil-off gas is purged to the intake manifold (S27).

On the other hand, when it is determined in step S21 that the EGR mode is deactivated, the control unit ECU determines whether the state of the internal combustion engine satisfies a predetermined differential pressure generation valve operating condition (S25). The differential pressure generating valve operating condition is a differential pressure generating valve for forming the opening and closing conditions of the differential pressure generating valve (DPV) determined based on the load ratio of the engine (ENGINE), and the negative pressure at the front end of the compressor required for purging the boil-off gas. (DPV) opening degree information is included.

When it is determined in step S25 that the state of the internal combustion engine satisfies the differential pressure generating valve operating condition, the controller ECU operates the differential pressure generating valve DPV to have an opening degree according to the differential pressure generating valve operating condition (S26).

After step S26, step S23 comparing the negative pressure of the intake manifold and the negative pressure of the front end of the compressor is performed, and controlling the switching of the canister purge valve (CPV) to purge the boil-off gas to the place where a larger negative pressure is formed. Step S24 or step S27 is performed.

On the other hand, if it is determined in step S25 that the state of the internal combustion engine does not meet the differential pressure generating valve operating condition, the control unit ECU does not operate the differential pressure generating valve DPV and purges the canister so that the evaporated gas is purged to the intake manifold. The switching of the valve is controlled (S27).

Thus, in this embodiment, even in a situation where it is difficult to purge the evaporated gas from the internal combustion engine equipped with the EGR system and the turbocharger to the intake manifold, a negative pressure at the front end of the compressor is formed through the differential pressure generating valve to purge the evaporated gas to the compressor front end. By controlling so that the boil-off gas collected in the canister can be effectively purged.

Although the present invention has been described with reference to the embodiments shown in the drawings, it is merely exemplary and various modifications and equivalent other embodiments are possible to those skilled in the art. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

Explanation of the sign

TURBOCHARGER: Turbocharger

COMPRESSOR: Compressor

TURBINE: Turbines

ENGINE: engine

AIRCLEANER: air cleaner

DPV: differential pressure generating valve

EGR_VALVE: EGR Valve

INTERCOOLER: Intercooler

THROTTLE_VALVE: Throttle Valve

CANISTER: canister

CPV: canister purge valve

CHECK_VALVE: check valve

ECU: Control

10: first purge line

20: second purge line

30: intake line

40: exhaust line

50: EGR line

The present invention relates to an apparatus and method for controlling an evaporative gas purge of an internal combustion engine, and may be used to manufacture an apparatus for controlling an evaporative gas purge of an internal combustion engine for controlling purge of fuel evaporated gas collected in a canister.

Claims

A turbocharger including a turbine that rotates by exhaust gas discharged from an engine, and a compressor that rotates by the turbine to compress suction gas supplied to the engine;

A canister collecting the boil-off gas generated in the fuel tank;

A canister purge valve configured to purge the boil-off gas collected in the canister by any one of an intake manifold of the engine and a front end of the compressor;

A differential pressure generating valve for generating a differential pressure between the pressure at the front end of the compressor and the atmospheric pressure; And

By controlling the switching of the canister purge valve according to whether the Exhaust Gas Recirculation (EGR) mode for recirculating the exhaust gas is activated and whether the differential pressure generating valve is operated, the evaporated gas collected in the canister is controlled by the intake manifold. A control unit for controlling to purge to any one of the front end of the compressor;

Evaporative gas purge control device for an internal combustion engine comprising a.
The method of claim 1,

The control unit controls the switching of the canister purge valve to purge the boil-off gas to a place where a greater negative pressure is formed between the intake manifold and the front end of the compressor when the EGR mode is activated and the differential pressure generating valve is operated. Evaporative gas purge control device for an internal combustion engine.
The method of claim 2,

And the differential pressure generation valve operating by activating the EGR mode has an opening degree for forming a negative pressure at the front end of the compressor required for recirculation of the exhaust gas.
The method of claim 1,

The control unit, when the EGR mode is deactivated, when the differential pressure generating valve is operated in accordance with a predetermined differential pressure generating valve operating condition, the control unit is a portion of the inlet manifold and the front end of the compressor, where the greater negative pressure is formed the evaporated gas Evaporation gas purge control device for an internal combustion engine, characterized in that for controlling the switching of the canister purge valve to purge.
The method of claim 4, wherein

The differential pressure generating valve operating condition is an opening degree of the differential pressure generating valve for forming an opening and closing condition of the differential pressure generating valve determined based on the load ratio of the engine, and a negative pressure at the front end of the compressor required for purging the boil-off gas. Evaporative gas purge control device for an internal combustion engine, characterized in that it comprises information.
The method of claim 1,

And the control unit controls the switching of the canister purge valve to purge the boil-off gas to the intake manifold when the differential pressure generating valve is inoperative.
Determining, by the controller, whether purge of the boil-off gas collected in the canister is necessary; And

If purging of the boil-off gas is necessary, the controller generates a differential pressure between whether the exhaust gas recirculation (EGR) mode is activated for recirculation of the exhaust gas discharged from the engine, and the pressure of the front end of the compressor provided in the turbocharger and the atmospheric pressure. Controlling switching of the canister purge valve according to whether the differential pressure generating valve is operated so that the evaporated gas collected in the canister is purged to one of the intake manifold of the engine and the front end of the compressor;

Evaporation gas purge control method of the internal combustion engine comprising a.
The method of claim 7, wherein

In the controlling step, the control unit,

When the EGR mode is activated and the differential pressure generating valve is operated, switching of the canister purge valve is controlled so that the boil-off gas is purged to a place where a greater negative pressure is formed in the front of the intake manifold and the compressor. Evaporative gas purge control method of the internal combustion engine.
The method of claim 8,

And the differential pressure generation valve operating by activating the EGR mode has an opening degree for forming a negative pressure at the front end of the compressor required for recirculation of the exhaust gas.
The method of claim 7, wherein

In the controlling step, the control unit,

When the differential pressure generating valve is operated in accordance with a predetermined differential pressure generating valve operating condition when the EGR mode is deactivated, the evaporation gas is purged to a place where a greater negative pressure is formed among the front ends of the intake manifold and the compressor. An evaporative gas purge control method for an internal combustion engine, characterized by controlling the switching of the canister purge valve.
The method of claim 10,

The differential pressure generating valve operating condition is an opening degree of the differential pressure generating valve for forming an opening and closing condition of the differential pressure generating valve determined based on the load ratio of the engine, and a negative pressure at the front end of the compressor required for purging the boil-off gas. Evaporation gas purge control method of an internal combustion engine, characterized in that it comprises information.
The method of claim 7, wherein

In the controlling step, the control unit,

And controlling the switching of the canister purge valve to purge the boil-off gas to the intake manifold when the differential pressure generating valve does not operate.