KR101928526B1 - Apparatus and method for controlling engine - Google Patents

Abstract

An engine control method for performing purge control is disclosed. The method includes the steps of estimating an amount of evaporated gas captured in the canister using a pre-modeled evaporation gas modeling table after the start of operation, and injecting the evaporated gas collected in the canister into the combustion chamber according to the estimated amount of evaporated gas And controlling the opening amount of the canister purge valve and the throttle valve.

Description

[0001] APPARATUS AND METHOD FOR CONTROLLING ENGINE [0002]

The present invention relates to an engine control apparatus and method, and more particularly, to an engine control apparatus and method for inducing combustion of an evaporative gas collected in a canister from a fuel tank.

Since the evaporation gas generated in the fuel tank of the vehicle is constituted by hydrocarbons (HC) which are harmful to human body and cause environmental pollution, such evaporation gas (HC) Emissions must be prevented. In order to prevent the discharge of the evaporative gas HC, the vehicle is provided with a device called a canister.

Generally, the canister is connected to a fuel tank of a vehicle and collects evaporative gas (HC) generated in the fuel tank during stoppage and running of the vehicle, and then collects the collected evaporative gas (HC) ) To the intake manifold.

The evaporated gas HC discharged into the intake manifold is burned together with the normal gasoline fuel in the combustion chamber so that the evaporated gas HC can be prevented from being discharged to the inside and the outside of the vehicle, Quot; purge control ") is referred to as " purge control ".

On the other hand, the conventional purge control can not know the amount of evaporative gas (HC) collected in the canister after the engine is turned on. Therefore, the conventional purge control does not consider the amount of evaporated gas (HC) captured in the canister after the engine is turned on, but merely controls the evaporation gas collected in the canister according to the duty control by the engine coolant temperature and the engine speed To the combustion chamber. If purging control is performed in which the evaporated gas that has been excessively concentrated in the stopped state of the vehicle enters the combustion chamber, the starting may be turned off and environmental pollution may occur due to unburned gas discharge.

In addition, since the amount of evaporative gas collected in the canister increases in a vehicle parked for a long time in an environment such as a high altitude (high altitude) or a high outside temperature, or a vehicle parked for a long time in a high summer temperature, More evaporation gas (HC) than the capacity (volume of activated carbon) flows into the combustion chamber, and the evaporation gas can flow out to the inside and the outside of the vehicle.

Further, in the purge control, since the evaporative gas HC is involved in the combustion, the engine output must be lowered. In particular, when the purge control is performed in the vehicle acceleration state in accordance with the driver's acceleration will, Can not be secured.

As described above, the purge control is performed by taking into account the amount of evaporative gas (HC) collected in the canister, the environmental conditions, the driver's willingness to accelerate and the like in a comprehensive manner without affecting engine operation and combustion. Although it is necessary to consume the collected evaporative gas (HC), the development of such a fuzzy control is still insufficient. Therefore, its development is urgent.

 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide an exhaust gas purifying apparatus capable of reducing the amount of evaporation gas (HC) collected in a canister, The present invention is to provide an engine control apparatus and method for performing fuzzy control that induces combustion of evaporative gas (HC) captured in a canister with a maximum control amount within a combustion chamber.

According to an aspect of the present invention, there is provided an engine control apparatus for performing purge control, including an intake manifold for storing air introduced by a throttle valve and a canister A canister purge valve installed at an arbitrary position of the duct for connecting and combusting the evaporated gas collected in the canister to the combustion chamber in the engine through the intake manifold; And estimating an amount of evaporated gas captured in the canister using a pre-modeled evaporation gas modeling table after the start of operation, and controlling the amount of evaporated gas in the canister to be introduced into the combustion chamber in accordance with the estimated amount of evaporated gas, And a control unit for performing a purge control for controlling a valve and an amount of opening of the throttle valve.

According to an aspect of the present invention, an engine control method for performing fuzzy control includes: estimating an evaporative gas amount captured in the canister using a pre-modeled evaporative gas modeling table after start of operation; And performing the purge control for controlling the amount of opening of the canister purge valve and the throttle valve so that the evaporated gas trapped in the canister is introduced into the combustion chamber.

According to the present invention, an evaporation gas table previously modeled according to environmental conditions is used to predict the amount of evaporated gas (HC) captured by the canister under the current environmental conditions, and the amount of the evaporated gas (HC) collected in the canister is consumed in the combustion chamber within a short period of time, thereby preventing evaporation gas (HC) leakage into and out of the vehicle, and accordingly, Air pollution can be prevented.

Further, according to the present invention, by consuming the evaporative gas (HC) collected in the canister with the maximum purge control amount within a range that does not affect engine operation and combustion according to the amount of evaporated gas (HC) captured by the canister, An improvement effect can be expected.

Further, according to the present invention, when fuzzy control is preferentially performed in an environmental condition such as a summertime and / or a high altitude where the outside temperature is high, the reliability of the canister is improved by continuously consuming the evaporative gas (HC) collected in the canister.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram schematically showing an overall configuration of an engine control device performing purge control according to an embodiment of the present invention; FIG.
2 is a functional block diagram showing the internal configuration of the control unit shown in Fig.
3 is a flowchart illustrating an operation sequence of an engine control apparatus for performing fuzzy control according to an embodiment of the present invention.

Best Mode for Carrying Out the Invention Various embodiments of the present invention will be described below with reference to the accompanying drawings. The various embodiments of the present invention are capable of various changes and may have various embodiments, and specific embodiments are illustrated in the drawings and the detailed description is described with reference to the drawings. It should be understood, however, that it is not intended to limit the various embodiments of the invention to the specific embodiments, but includes all changes and / or equivalents and alternatives falling within the spirit and scope of the various embodiments of the invention. In connection with the description of the drawings, like reference numerals have been used for like elements.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram schematically showing an overall configuration of an engine control device performing purge control according to an embodiment of the present invention; FIG.

Referring to FIG. 1, an engine control apparatus 100 according to an embodiment of the present invention uses an evaporation gas (HC) modeling table previously modeled according to environmental conditions, And carries out fuzzy control in which the evaporation gas (HC) collected in the canister is introduced into the combustion chamber and burned in accordance with the predicted HC amount.

The engine control apparatus 100 according to an embodiment of the present invention includes a canister 101, a first on-off valve 103, a second on-off valve 105, an opening amount sensor 107, The first pressure sensor 111, the fuel level sensor 113, the second pressure sensor 115, the atmospheric pressure sensor 117, the outside air temperature sensor 119, the accelerator pedal position sensor 121 and the control unit 123 ).

The canister 101 is connected to the fuel tank 11 through a pipeline and collects the HC evaporated in the fuel tank 11. The canister 101 is disposed at an arbitrary position of the fuel tank 11 in the fuel tank 11 A first pressure sensor 111 for measuring the pressure (evaporation pressure) of the HC to be evaporated may be provided. Here, the first pressure sensor 111 may be a fuel tank pressure sensor.

A fuel level sensor 113 for measuring the fuel level in the fuel tank 11 may be provided at any position of the fuel tank 11.

In addition, a duct for introducing air (or air) into an arbitrary position of the canister 101 is connected, and a first opening / closing valve 103 for interrupting the air at an arbitrary position of the duct is installed. Here, the first on-off valve 103 may be a canister close valve (CCV).

The second on-off valve 105 is a valve installed in an arbitrary position of a conduit for transferring air to an intake manifold 13 in accordance with the driving of the accelerator pedal. The intake manifold 13, As shown in FIG. Here, the second on-off valve 105 may be a throttle valve (TV).

On the other hand, the opening amount sensor 107, which is provided integrally with the second opening / closing valve 105 and measures the opening amount of the second opening / closing valve 105, is provided, And may be a throttle position sensor for measuring the amount of opening of the valve.

The third on-off valve 109 is installed at a predetermined position in the duct connecting the intake manifold 13 storing the air introduced by the second on-off valve 105 and the canister 101, The HC collected in the canister 101 is introduced into the combustion chamber in the engine 15 through the intake manifold 13. [ Here, the third opening / closing valve 109 may be a canister purge valve (CPV).

Reference numeral 115 denotes a second pressure sensor 115 installed at an arbitrary position of the intake manifold 13. The second pressure sensor 115 measures a pressure change of the intake manifold 13 can do. Here, the second pressure sensor 115 may be a MAP (Manifold Absolute Pressure) sensor.

The control unit 123 is configured to perform the fuzzy control for causing the evaporated gas HC of the canister to flow into the combustion chamber when the vehicle is traveling and burning the combustion gas, And can control the overall operations 103, 103, 107, 109, 111, 113, and 115 of the respective components.

Specifically, the control unit 123 uses at least one of the atmospheric pressure measured by the atmospheric pressure sensor 117, the outside temperature measured by the outside air temperature sensor 119, and the fuel level measured by the fuel level sensor 113, And estimates the amount of collected HC of the canister in the analyzed current environmental conditions using the HC modeling table modeled beforehand according to the environmental condition and calculates the amount of collected HC in the canister HC is injected into the combustion chamber and fired.

Further, the controller 123 determines the driver's will to be accelerated based on the accelerator pedal value (%, angular velocity value of the accelerator pedal) measured by the accelerator pedal position sensor 121, As shown in FIG. That is, when the accelerator pedal value measured by the accelerator pedal position sensor 121 is equal to or greater than the threshold value, the controller 123 confirms that the driver has an acceleration, releases the fuzzy control, Closing control is performed so that the second opening / closing valve 105 (TV) is opened beyond the opening amount limited by the purge control for the matching engine output.

Hereinafter, the control unit 123 will be described in more detail with reference to FIG.

2 is a functional block diagram showing the internal configuration of the control unit shown in Fig.

2, the control unit 123 includes an RVP calculating unit 123-1, an evaporation gas (HC) modeling table 123-3, a correction value generating unit 123-5, a calculating unit 123-7, An accumulation unit 123-9, a timer 123-11, an evaporation gas (HC) amount calculation unit 123-13, and a purge control amount calculation unit 123-15.

The RVP calculating unit 123-1 calculates the vapor pressure of the fuel measured by the first pressure sensor 111 (fuel tank pressure sensor) while the CCV 103 and the CPV 109 are off after the start of the vehicle And the outside air temperature (° C) measured by the outside air temperature sensor 119. The RVP (Reid Vapor Pressure) The RVP calculated by the RVP calculating unit 123-1 is a value indicating the rate of change of the evaporation pressure according to the outside air temperature (占 폚), and is used for determining seasonal conditions such as summer, winter or winter.

The HC modeling table 123-3 includes a plurality of evaporation gases (hereinafter referred to as " evaporated ") that have been previously modeled (or learned) in accordance with environmental conditions to predict the amount of collected HC of the canister 101 under the current environmental conditions after the start of the vehicle (HC) stored in the form of a table, and may include a plurality of tables configured by the calculated RVPs.

The table corresponding to the RVP calculated by the RVP arithmetic unit 123-1 among the plurality of tables constituting the HC modeling table 123-3 is selected and the current value of the current measured by the fuel level sensor 113 The fuel level (%) and the current outside temperature (° C) measured by the outside air temperature sensor 119 are input. Thereafter, the amount of HC mapped to the input current fuel level (%) and the current outside temperature (° C) from the amount of the plurality of evaporative gases (HC) stored in the selected table is output from the selected table.

In the following, Table 1 is an example of the HC modeling table corresponding to the summer low RVP, and Table 2 is an example of the HC modeling table corresponding to the winter high RVP.

-20 ° C -10 ° C 0 ℃ 10 ℃ 20 ℃ 30 ℃ 40 ℃ 50 ℃ 0% 0 mg 0 mg 0 mg 1 mg 3 mg 10 mg 50 mg 150 mg 25% 0 mg 0 mg 0 mg 1 mg 5 mg 20 mg 70 mg 200 mg 50% 0 mg 0 mg 0 mg 3 mg 10 mg 30 mg 100 mg 250 mg 75% 0 mg 0 mg 0 mg 5 mg 15 mg 40 mg 130 mg 280 mg 100% 0 mg 0 mg 0 mg 10 mg 20 mg 50 mg 150 mg 300 mg

%: Fuel level, ° C: Ambient temperature, mg: Unit time Amount of collected HC

-20 ° C -10 ° C 0 ℃ 10 ℃ 20 ℃ 30 ℃ 40 ℃ 50 ℃ 0% 0 mg 0 mg 0 mg 10 mg 25 mg 450 mg 50 mg 800 mg 25% 0 mg 0 mg 0 mg 15 mg 30 mg 500 mg 700 mg 850 mg 50% 0 mg 0 mg 0 mg 20 mg 50 mg 550 mg 750 mg 900 mg 75% 0 mg 0 mg 0 mg 25 mg 100 mg 600 mg 780 mg 950 mg 100% 0 mg 0 mg 0 mg 30 mg 150 mg 650 mg 800 mg 1000 mg

%: Fuel level, ° C: Ambient temperature, mg: Unit time Amount of collected HC

The correction value generator 123-5 generates a correction value for correcting the HC amount output from the HC modeling table 123-3 according to the current altitude of the vehicle in the environmental condition. Specifically, the correction value generator 123-5 refers to the HC modeling correction table stored with the correction values previously modeled (or learned) in accordance with the atmospheric pressure of each altitude, And extracts a correction value mapped to the atmospheric pressure from the HC modeling correction table.

Table 3 below is an example of the HC modeling correction table.

Altitude (m) a 3000 c d e f g h Atmospheric pressure (hPa) 600 700 800 850 900 950 1013 1050 Correction value 1.3 1.2 1.1 1.08 1.05 1.03 1.0 1.0

The calculation unit 123-7 corrects the correction value generated by the correction value generation unit 123-5 from the HC amount output from the HC modeling table 123-3. Specifically, the calculation unit 123-7 calculates the amount of evaporated gas from the HC modeling table 123-3 and the correction value from the correction value generation unit 123-5, and outputs the corrected HC Quot; Here, the operation may be a multiplication operation.

The accumulation unit 123-9 accumulates the HC amount corrected by the arithmetic unit 123-7 in the vehicle stop state every predetermined time (for example, one hour) by the timer 123-11.

The final HC amount calculating unit 123-13 calculates the total HC amount of the canister 101 (g, the activated carbon volume in the canister 101), the total HC amount obtained by integrating the HC amount corrected by the integrating unit 123-9 ). That is, the integrated HC amount calculating unit 123-13 compares the integrated value (mg) with the maximum trapped amount (g), and when the integrated value (mg) is equal to or less than the maximum trapped amount (g) The cumulative value is calculated as the final HC amount (%) captured by the canister 101. When the cumulative value (mg) exceeds the maximum collecting amount (g), the maximum collecting amount (g) ) Is calculated as the final amount (%) of HC collected in the final product.

The purge control amount determining unit 123-15 determines whether or not the purge control amount determining unit 123-15 determines that the purge amount of the purge control mode is in the purge control mode, The control amount is determined. Here, the purge control amount includes the amount of opening of the second opening / closing valve 105 (throttle valve (TV)) and opening amount of the third opening / closing valve 109 (canister purge valve (CPV)).

The fuzzy control mode includes first to fourth purge control modes.

The first purge control mode is a mode performed when the accelerator pedal ratio is less than 50% and the final HC amount (%) falls within a first range (90% to 100%). In the first purge control mode, CPV The maximum opening amount of the TV 105 is limited so that the opening amount of the air intake valve 109 is controlled to 100% and the intake air pressure is equal to or less than the first pressure (for example, 850 hPa) The HC is exhausted through the combustion chamber. Meanwhile, when the vehicle is switched from the running state to the stopped state while the first purge control mode is being performed, excessive HC may be introduced into the combustion chamber in the vehicle stop state. Therefore, in order to prevent the start- The first purge control mode is canceled by controlling the opening amount of the first purge control means 109 to 0%.

Wherein the second purge control mode is a mode performed when the acceleration pedal ratio is less than 50% and the final HC amount (%) falls within a second range (70% to 90%), and in the second purge control mode, CPV 109) is controlled to 100%, the maximum opening amount of the TV 105 is limited so that the intake air pressure is equal to or less than the second pressure (for example, 900 hPa), the CPV 109 is maintained at the minimum negative pressure, The HC is exhausted through the combustion chamber. On the other hand, the second purge control mode is maintained without being released even when the vehicle is stopped, unlike the first purge control mode. However, the maximum opening amount of the CPV 109 is limited to 15% while the second purge control mode is being performed in the stopped state of the vehicle.

The third purge control mode is a mode performed when the accelerator pedal ratio is less than 30% and the final HC amount (%) falls within the third range (50% to 70%). In the third purge control mode, The opening amount of the CPV 109 and the opening amount of the TV 105 are controlled in the same manner as the 2-purging control mode. However, in the third purge control mode, when the acceleration pedal ratio is 50% or more, the third purge control mode is released, and the maximum opening amount of the CPV 109 is limited to 25% This is different from the fuzzy control mode.

The fourth purge control mode is a mode performed when the final HC amount (%) falls within the fourth range (0% to 50%), and does not perform the fuzzy control in the fourth purge control mode. That is, there is no limitation on the amount of opening of the TV 105.

In this way, the purge control amount determining unit 123-15 determines whether or not the maximum opening amount of the TV 105 is limited according to the purge control mode determined according to the final HC amount within the range that does not affect the engine operation and the combustion If the CPV 109 performs fuzzy control for consuming the HC collected in the canister 101 and the accumulated HC amount becomes lower than the set threshold value (50%) while the engine control and the running are proceeding, It is regarded that the HC in the canister is sufficiently exhausted, and the purging control is terminated.

By doing so, the HC collected in the canister 101 can be consumed in the combustion chamber within a short period of time, thereby preventing the HC leakage to the inside / outside of the vehicle and the air pollution caused thereby, and the fuel efficiency improvement effect can be expected. In addition, when the fuzzy control is preferentially performed in an environmental condition such as a summertime and / or a high altitude where the outside temperature is high, the reliability of the canister can be improved by continuously consuming the evaporative gas (HC) collected in the canister.

3 is a flowchart illustrating an operation sequence of an engine control apparatus for performing fuzzy control according to an embodiment of the present invention. To facilitate understanding of the description, reference is made to Figures 1 and 2 together.

Referring to Fig. 3, first, in step S310, engine operation is started.

Then, in step S312, the RVP is calculated. Specifically, the vapor pressure of the fuel measured by the fuel tank pressure sensor 111 and the outside air temperature (占 폚) measured by the outside air temperature sensor 119 are used in a state where the CCV 103 and the CPV 109 are off And calculates RVP (Reid Vapor Pressure). At this time, a predefined RVP table can be used to calculate the RVP. The RVP table can be a table on which the RVP is stored according to the evaporation pressure and the outside air temperature.

Next, in step S314, referring to the HC modeling table 123-3, the HC amount mapped to the calculated RVP, the current outside temperature and the current fuel level is estimated. Specifically, the HC modeling table 123-3 corresponding to the calculated RVP is selected, and the current fuel level (%) measured by the fuel level sensor 113 is calculated by referring to the selected HC modeling table 123-3. And the HC amount mapped to the current outside temperature (° C) measured by the outside air temperature sensor 119 from the selected HC modeling table 123-3 to estimate the HC amount.

Subsequently, in step S316, the estimated HC amount is corrected by referring to the HC modeling correction table. Specifically, referring to the HC modeling correction table stored with the previously-modeled (or learned) correction values in accordance with the atmospheric pressure for each altitude, a correction value mapped to the atmospheric pressure measured by the atmospheric pressure sensor 117 is referred to as the HC modeling correction table And corrects the estimated HC amount by the extracted correction value.

Then, in step S318, the corrected HC amount is accumulated. Specifically, the HC amount corrected in the vehicle stop state is accumulated every predetermined time (for example, one hour) by the timer 123-11.

Then, in step S320, the final HC amount is calculated. Specifically, when the accumulated HC amount is compared with the maximum collection amount (activated carbon volume in the canister) of the canister 101 and the accumulated HC amount is equal to or smaller than the maximum collection amount, the integrated value is collected in the canister 101 (%), And when the integrated value (mg) exceeds the maximum collection amount (g), the maximum collection amount is calculated as the final HC amount collected by the canister (101).

Then, in step S322, the purge control mode is selected according to the calculated final HC amount. Specifically, when the calculated final HC amount (%) falls within the first range (90% to 100%), the first purge control mode is selected, and the calculated final HC amount% 70% to 90%), the second purge control mode is selected, and when the calculated final HC amount (%) belongs to the third range (50% to 70% do. When the calculated final HC amount (%) falls within the fourth range (0% to 50%), the fourth purge control mode is selected.

Next, in step S324, control of the opening amount of the CPV and the TV is controlled according to the selected fuzzy control mode. Specifically, when the first purge control mode is selected, the opening amount of the CPV 109 is controlled to 100%, and the maximum value of the TV 105 is set such that the intake air pressure is equal to or less than the first pressure (for example, 850 hPa) And performs fuzzy control to exhaust HC collected in the canister 101. [ At this time, when the vehicle is in a stopped state during the execution of the first purge control mode, the excessive amount of HC may be introduced into the combustion chamber, so that the opening amount of the CPV 109 is controlled to 0%. That is, the first purge control mode is canceled. Also, the first purge control mode is canceled even when the accelerator pedal ratio is 50% or more.

When the second purge control mode is selected, the opening amount of the CPV 109 is controlled to 100%, and the maximum opening amount of the TV 105 is limited so that the intake air pressure is equal to or less than the second pressure (for example, 900 hPa) And performs the purge control for exhausting the HC collected in the canister 101. [ In this case, in the second purge control mode, unlike the first purge control mode, the vehicle is not released even when the vehicle is stopped. However, when the vehicle is switched to the stopped state while the second purge control mode is being performed, the maximum opening amount of the CPV 109 is limited to 15%. On the other hand, when the acceleration pedal ratio is 50% or more, the second purge control mode is canceled.

When the third purge control mode is selected, the opening amount of the CPV 109 and the opening amount of the TV 105 are controlled in the same manner as the second purge control mode. However, in the third purge control mode, when the acceleration pedal ratio is 50% or more, the third purge control mode is released, and the maximum opening amount of the CPV 109 is limited to 25% This is different from the fuzzy control mode.

When the fourth purge control mode is selected, the fuzzy control is ended, and the amount of opening of the TV 105 is not limited.

Then, in step S325, the HC amount remaining and consumed is compared with the threshold value. Here, the threshold may be 50%. If the remaining HC amount is less than or equal to the threshold value, the process proceeds to step S326 to terminate the purging control. If the HC amount remaining and consumed exceeds the threshold value, the fuzzy control for exhausting the HC until the consumed HC amount becomes less than the threshold value is maintained do.

As described above, according to the present invention, the CPV 109 is captured in the canister 101 in a state in which the maximum opening amount of the TV 105 is limited according to the selected fuzzy control mode within a range not affecting engine operation and combustion. The HC collected in the canister 101 is consumed in the combustion chamber within a short period of time by performing the purging control for consuming the HC that has been consumed and the prevention of HC leakage into and out of the vehicle, Effect can be expected. Further, the fuzzy control is performed in an environment condition such as a summertime and / or a high altitude in which the outside temperature is high, so that the reliability of the canister can be improved by continuously consuming the evaporative gas (HC) collected in the canister.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications not illustrated in the drawings are possible. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (15)

An air conditioner according to claim 1, further comprising: an intake manifold installed at an arbitrary position in a duct connecting a canister and an intake manifold for storing air introduced by a throttle valve, A canister purge valve for introducing the canister purge valve into a combustion chamber in the engine and burning the canister purge valve; And
And a controller for estimating the amount of evaporated gas captured in the canister by using a previously modeled evaporation gas modeling table after the start of the operation and for supplying the evaporated gas collected in the canister to the combustion chamber according to the estimated amount of evaporated gas, And a controller for performing a purge control for controlling an amount of opening of the throttle valve,
Wherein,
The fuel level measured by the fuel level sensor, the outside air temperature measured by the outside air temperature sensor, and the evaporative gas amount mapped to the reed vapor pressure (RVP) representing the rate of change of the evaporating pressure measured by the fuel tank pressure sensor according to the outside air temperature, And estimating an amount of the extracted evaporated gas as an amount of evaporated gas captured in the canister,
And a controller for comparing the estimated evaporated gas amount at every predetermined time and comparing the accumulated evaporated gas amount with a maximum collecting amount of the canister (an activated carbon volume in the canister), and when the accumulated evaporated gas amount is equal to or less than the maximum collected amount, The amount of evaporated gas accumulated in the canister is calculated as the amount of final evaporated gas collected in the canister, and when the accumulated evaporated gas amount exceeds the maximum collected amount, the maximum collected amount is reduced to the final evaporated gas amount captured in the canister And the purge control is performed according to the calculated final evaporated gas amount.
delete 2. The apparatus of claim 1,
Wherein the estimated evaporation gas amount is corrected using an evaporation gas modeling correction table stored in advance with a correction value modeled according to an atmospheric pressure for each altitude.
delete 2. The apparatus of claim 1,
Wherein when the estimated evaporative gas amount falls within the first range (90% to 100%) and the accelerator pedal ratio is less than 50%, the open amount of the canister purge valve is controlled to 100%, and the intake air pressure is controlled to be 850 hPa or less Performing the purge control to limit the maximum opening amount of the throttle valve,
And terminates the purge control when the vehicle is switched to the stopped state.
2. The apparatus of claim 1,
And controlling the opening amount of the canister purge valve to be 100% when the estimated evaporative gas amount falls within the second range (70% to 90%) and the accelerator pedal ratio is less than 50% Performing the purge control to limit the maximum opening amount of the throttle valve,
And performs the purge control to limit the opening amount of the purge valve to 15% when the vehicle is switched to the stopped state.
2. The apparatus of claim 1,
And controlling the opening amount of the canister purge valve to be 100% when the estimated evaporative gas amount falls within the third range (50% to 70%) and the accelerator pedal ratio is less than 30% Performing the purge control to limit the maximum opening amount of the throttle valve,
And performs the purge control to limit the opening amount of the canister purge valve to 25% when the vehicle is switched to the stopped state. 2. The apparatus of claim 1,
And terminates the purge control when the estimated evaporative gas amount falls within the fourth range (0% to 50%).
An air conditioner according to claim 1, further comprising: an intake manifold installed at an arbitrary position in a duct connecting a canister and an intake manifold for storing air introduced by a throttle valve, In the engine control method for performing purge control in which the exhaust gas is introduced into the combustion chamber in the engine via the exhaust pipe,
Estimating an evaporated gas amount captured in the canister using a pre-modeled evaporation gas modeling table after start of operation; And
And performing the purge control for controlling the amount of opening of the canister purge valve and the throttle valve so that the evaporated gas trapped in the canister is introduced into the combustion chamber according to the estimated amount of evaporated gas,
The step of estimating the amount of evaporated gas includes:
Extracting, from the evaporation gas modeling table, an evaporative gas amount mapped to a current Reid Vapor Pressure (RVP) representing the rate of change of the evaporative pressure of the evaporative gas according to the current fuel level, the current outside temperature and the outside temperature; And
And estimating the extracted amount of evaporated gas as an amount of evaporated gas captured in the canister,
The step of estimating the amount of evaporated gas includes:
Extracting from the evaporation gas modeling table an amount of evaporative gas mapped to a current Reid Vapor Pressure (RVP) representing a rate of change of the evaporative pressure of the evaporative gas according to a current fuel level, a current outside temperature, and an outside temperature;
Extracting a correction value mapped to a current atmospheric pressure from an evaporation gas modeling correction table storing a previously-modeled correction value according to an atmospheric pressure per altitude;
Correcting the extracted evaporated gas amount with the extracted correction value; And
And a controller for comparing the accumulated evaporated gas amount with a maximum captured amount of the canister at every predetermined time, comparing the accumulated evaporated gas amount with a maximum captured amount of the canister, and if the accumulated evaporated gas amount is equal to or less than the maximum collected amount, Calculating a maximum amount of collected gas to be the final evaporated gas amount collected in the canister when the accumulated evaporated gas amount exceeds the maximum collected amount, calculating an evaporated gas amount as a final evaporated gas amount captured in the canister, And estimating the evaporated gas amount as the final evaporated gas amount.
delete 10. The method of claim 9, wherein estimating the evaporated gas amount comprises:
Extracting, from the evaporation gas modeling table, an evaporative gas amount mapped to a current Reid Vapor Pressure (RVP) representing the rate of change of the evaporative pressure of the evaporative gas according to the current fuel level, the current outside temperature and the outside temperature;
Extracting a correction value mapped to a current atmospheric pressure from an evaporation gas modeling correction table storing a previously-modeled correction value according to an atmospheric pressure per altitude; And
Correcting the extracted amount of evaporated gas with the extracted correction value and calculating the corrected amount of evaporated gas with the estimated amount of evaporated gas;
And an engine control unit for controlling the engine.
delete 10. The method of claim 9, wherein performing the fuzzy control comprises:
Wherein when the estimated evaporative gas amount falls within the first range (90% to 100%) and the accelerator pedal ratio is less than 50%, the open amount of the canister purge valve is controlled to 100%, and the intake air pressure is controlled to be 850 hPa or less Performing a first purge control to limit a maximum opening amount of the throttle valve;
And controlling the opening amount of the canister purge valve to be 100% when the estimated evaporative gas amount falls within the second range (70% to 90%) and the accelerator pedal ratio is less than 50% Performing a second purge control to limit a maximum opening amount of the throttle valve; And
And controlling the opening amount of the canister purge valve to be 100% when the estimated evaporative gas amount falls within the third range (50% to 70%) and the accelerator pedal ratio is less than 30% Performing a third purge control for limiting the maximum amount of throttle valve opening and limiting the opening amount of the canister purge valve to 25% when the vehicle is switched to the stopping state
And an engine control unit for controlling the engine.
14. The method according to claim 13, wherein, when the vehicle is switched to the stopped state,
The step of performing the first purge control is terminated,
Wherein the opening amount of the purge valve is limited to 15% in performing the second purge control.
14. The method of claim 13, wherein performing the fuzzy control comprises:
And performing fourth purge control for terminating the purge control when the estimated evaporative gas amount falls within a fourth range (0% to 50%).

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