KR101773465B1 - Method for reducing exhaust gases of vehicle - Google Patents

Abstract

The present invention discloses a method for reducing exhaust gas of a vehicle. The exhaust gas reducing method of the vehicle according to the present invention is not limited to diagnosing only the hazardous exhaust gas discharged from the vehicle but consists of a configuration for correcting the related control system so as to prevent an increase in exhaust gas after diagnosis. Therefore, the present invention can reduce or prevent the increase of the harmful exhaust gas emitted from the vehicle, not only the maintenance guidance by executing only the diagnosis on the harmful exhaust gas.

Description

METHOD FOR REDUCING EXHAUST GASES OF VEHICLE [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for reducing exhaust gas in a vehicle, and more particularly, to a method for reducing exhaust emission of a vehicle for correcting an associated control system to prevent an increase in exhaust gas after diagnosis, To a gas reduction method.

Generally, the vehicle is provided with a control system for informing the driver of the increase of the harmful exhaust gas discharged from the vehicle in consideration of the atmospheric environment.

The above-mentioned control system refers to OBD (On Board Diagnostics) control system, which detects the increase of harmful exhaust gas due to malfunction or failure of the parts related to exhaust gas of the vehicle, and turns on the maintenance indicator light on the instrument panel of the vehicle It is a system that informs the driver accordingly.

In addition, the OBD (On Board Diagnostics) control system has OBD 1 version and OBD 2 version.

The OBD 1 version is a version that was used in the past. If the vehicle is faulty, the warning light is turned on to alert the driver to the problem before the discharge of the hazardous emissions. The main point is to provide fault information and code equipment information for the control.

However, the OBD 1 version has evolved into the OBD 2 version due to limitations such as detecting disconnection or short circuit of electronic component wiring, increase of exhaust gas due to abnormal operation of sensor or actuator, and problems such as nonstandard of engine warning lamp lighting standard.

Such OBD 2 versions have key functions such as catalyst purifying efficiency performance detection, engine misfire detection, oxygen sensor aging detection, EGR detection, evaporation gas detection, and fuel supply system detection.

However, according to the related art, there is a problem that only the diagnosis of the harmful emission gas is carried out and only the maintenance guidance is provided, so that there is no way to prevent the increase of harmful exhaust gas discharged from the vehicle.

Specifically, when a problem arises in the fuel system equipment related to exhaust gas emission as shown in FIG. 1, the time point of increase of the exhaust gas occurs in an idle period or an acceleration period immediately after the fuel cutoff period, A solution to the problem will be required.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a fuel cell system and a fuel cell system, And a control method for preventing an increase in exhaust gas in an idle period or an acceleration period after a fuel cut-off period on the basis of a period of a fuel cut-off period.

According to a first aspect of the present invention, there is provided a method for reducing an emission gas of a vehicle, comprising the steps of: determining occurrence of a malfunction or failure of a vehicle in which an emission gas harmful to an atmospheric environment may be generated in an electronic control device; Determining a fuel cut-off period that will occur when a determination result error occurs, determining an average value of a lambda closed loop control value stored in advance for an idle period after the fuel cut-off period to a lambda closed loop Setting a lambda closed loop control start value to a lambda closed loop control start value at the start of the idle period and performing a control operation for the idle period with a lambda closed loop control start value at the start of the idle period .

Advantageously, the method for reducing the exhaust gas of the vehicle further comprises the step of calculating the lambda closed loop based on a lambda closed loop control value applied to another idle period before the idle period, And calculating and storing an average value of the control values.

Preferably, the idle period is a period immediately following the fuel cut-off period.

Preferably, the determination of the occurrence of a malfunction or a failure of the vehicle is performed through an OBD (On Board Diagnostics) 2 system.

Preferably, the other idle period corresponds to a period immediately before the fuel cut-off period.

To achieve the above object, according to a second aspect of the present invention, there is provided a method for reducing an emission gas of a vehicle, comprising the steps of: judging occurrence of a malfunction or failure of a vehicle in which an emission gas harmful to the atmospheric environment may be generated Determining a fuel cut-off period that will occur in the future when an error occurs as a result of the determination, determining an average value of Lambda closed loop control values stored in advance for the acceleration period after the fuel cutoff period as a lambda closed loop closed loop control start value, and performing a control for the acceleration period with the lambda closed loop control start value at the start of the acceleration period.

Preferably, the exhaust gas reduction method of the vehicle calculates an average value of the lambda closed loop control value based on a lambda closed loop control value applied to another acceleration period before the acceleration period And then storing the data.

Preferably, the acceleration section is an initial acceleration section that comes immediately after the fuel cut-off section.

Preferably, the determination of the occurrence of a malfunction or a failure of the vehicle is performed through an OBD (On Board Diagnostics) 2 system.

Preferably, the other acceleration period is a period immediately before the fuel cut-off period.

Therefore, in the present invention, when the emission of harmful exhaust gas from the vehicle is diagnosed (that is, when an abnormality occurs in the fuel system), the idle period or the acceleration period after the fuel cut- It is possible to reduce or prevent the increase of the harmful exhaust gas discharged from the vehicle, instead of performing only the diagnosis of the harmful exhaust gas and performing the maintenance guidance only by performing the control for preventing the increase of the exhaust gas in the section .

1 is a diagram showing a lambda closed loop control according to the prior art,
2 is a view showing an exhaust gas reducing device for a vehicle according to an embodiment of the present invention,
FIG. 3 is a diagram showing a Lambda closed loop control by the apparatus shown in FIG. 2 as an embodiment;
FIG. 4 is a diagram illustrating an operation process of the apparatus shown in FIG. 2 as an embodiment;
5 is a view showing another embodiment of an exhaust gas reducing apparatus for a vehicle according to the present invention,
6 is a diagram showing a lambda closed loop control by the apparatus shown in Fig. 5 as an embodiment, and Fig.
FIG. 7 is a flowchart illustrating an operation of the apparatus shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a method for reducing exhaust gas of a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing an exhaust gas reducing apparatus for a vehicle according to an embodiment of the present invention. As shown in the example of FIG. 2 only, when the emission gas reduction device of the vehicle senses an abnormality in the fuel system equipment related to the emission of the emission gas, And performs control for reducing the exhaust gas with respect to the Idle period.

Here, the exhaust gas reduction device of the vehicle is a concept including the in-vehicle electronic control device 100 in a main configuration, and in the following description, a sensor (not shown) for detecting an anomaly signal to the fuel system equipment related to harmful exhaust gas discharged from the vehicle And the like will be omitted.

Therefore, the configuration of the electronic control unit 100 for performing the control for reducing the exhaust gas in the idle period after the fuel cut-off period is that the measurement signal for the fuel system equipment related to the exhaust of the exhaust gas is received The first judging unit 110 for judging the occurrence of a malfunction or failure of the vehicle which may generate the exhaust gas harmful to the atmospheric environment based on the judgment result of the first judging unit 110, A second judgment part 120 for judging an incoming fuel cut-off period, a lambda closed loop in another idle period already executed for the idle period after the determined fuel cut-off period, A setting unit 130 for setting an average value of the control values to a lambda closed loop control start value and a lambda closed loop control set at the start of the idle period And a control execution unit 140 for performing control execution for an idle period as a start value.

In this case, the electronic control unit 100 has to calculate an average value of the lambda closed loop control value in another idle period that has already been performed. In the other idle period that has already been performed, And a calculator and a storage unit for storing the result of performing a calculation for obtaining an average of the Lambda closed loop control value of the Lambda closed loop control value.

In addition, 'another idle period already executed before' will be described with reference to FIG.

FIG. 3 is a diagram showing a lambda closed loop control by the apparatus shown in FIG. 2 as an embodiment. As shown by way of example only in FIG. 3, 'another idle period previously executed' refers to an idle period before the fuel cutoff period, and more specifically, Idle) period.

The reason for this is that a lambda closed loop control criterion for performing in the idle period to reduce the exhaust gas is provided by a lambda closed loop control which was executed just before the fuel cut- It would be appropriate to target.

That is, according to the prior art, a graph form is shown in which the lambda closed loop control, which is executed in the idle section immediately after the fuel cutoff, starts to be started at 0%, and increases until the appropriate correction value is found .

For this reason, the exhaust gas increases in the idle section immediately after the fuel cut-off section.

Therefore, the lambda closed loop control for executing in the idle period immediately after the fuel cutoff period is not started at 0%, but the lambda closed loop control for performing the lambda closed loop control in the other idle period, The control value is set by setting the average value of the control value of the loop (Lambda closed loop) as the control start value.

Likewise, the idle period for reducing the exhaust gas is preferably an idle period after the fuel cutoff period elapses, more specifically, an idle period immediately after the fuel cutoff period.

Also, the reason for this is that the increase of the exhaust gas rapidly increases in the idle period immediately after the fuel cut-off period has elapsed, as mentioned for a while.

In addition, the electronic control unit 100 often performs the determination based on the OBD (On Board Diagnostics) 2 system to determine whether a malfunction or a failure of the vehicle has occurred.

FIG. 4 is a diagram illustrating an operation of the apparatus shown in FIG. 2 according to an embodiment of the present invention. As shown by way of example only in FIG. 4, the method for reducing the exhaust gas of a vehicle proceeds to determine whether the fuel system equipment associated with the discharge of the harmful exhaust gas in the electronic control device 100 senses that an abnormal symptom occurs (S100 and S102).

If it is determined from the determination result of step S102 that there is an abnormal symptom in the fuel system of the vehicle to such an extent that harmful exhaust gas is discharged (S104).

Then, it is determined whether an idle section immediately after the fuel cut-off period arrives when the fuel cut-off period determined in step S104 comes (S106).

If the arrival of the idle period is confirmed in step S106, the average value of the lambda closed loop control values for the other idle periods before the fuel cut-off period stored in advance is loaded, and the average value is controlled A lambda closed loop control start value for an idle period to be subjected to the lambda closed loop control is set (S108).

After the setting process is started, control for the idle period is performed through the Lambda closed loop control start value set at the start of the idle period for control (S110).

Thereafter, when the vehicle operation is terminated, the processes are also terminated (S112).

5 is a view showing an exhaust gas reducing device for a vehicle according to another embodiment of the present invention. When the vehicle exhaust gas reduction device detects an abnormality in the fuel system equipment related to the discharge of exhaust gas, the control for decreasing the exhaust gas is performed for the acceleration period after the fuel cutoff period, .

Here, the exhaust gas reduction device of the vehicle is a concept including the in-vehicle electronic control device 200 in a main configuration.

Accordingly, the configuration of the electronic control unit 200 for performing the control for reducing the exhaust gas with respect to the acceleration period after the fuel cut-off period is based on the reception of the measurement signal for the fuel system equipment related to the discharge of the exhaust gas A first judging unit 210 for judging the occurrence of a malfunction or a failure of a vehicle which may generate exhaust gas harmful to the atmospheric environment; A second judgment part (220) for judging a shut-off section, and a second judgment part (220) for judging a lambda closed loop control value in another acceleration section already executed for the acceleration section after the determined fuel cut- (230) for setting the Lambda closed loop control start value, and a lambda closed loop control start value set at the start of the acceleration period, Equip a configuration in which a control executing section 240 for a control run.

In this case, the electronic control unit 200 has to find an average value of the Lambda closed loop control value in another acceleration period which has already been executed. In this case, the lambda closed loop (Lambda and a calculation and storage unit for storing a result of performing a calculation for obtaining an average of the closed loop control values.

On the other hand, when the idle period and the acceleration period are compared with each other, the exhaust gas is increased more than the idle period during the gear change during the acceleration period.

Therefore, it is necessary to more closely compute the emission gas increment correction for the acceleration section.

FIG. 6 is a diagram showing a lambda closed loop control by the apparatus shown in FIG. 5 as one embodiment. As shown only by way of example in FIG. 6, 'another acceleration section already executed before' refers to an acceleration section before the fuel cutoff section, and more specifically, it is preferably an acceleration section immediately before the fuel cutoff section.

The reason for this is that the lambda closed loop control criterion for performing in the acceleration section, which is the object to reduce the exhaust gas, is applied to the lambda closed loop control, It would be appropriate to do so.

That is, according to the prior art, a graph form is shown in which the lambda closed loop control, which is executed in the acceleration period immediately after the fuel cutoff, starts from 0% until the appropriate correction value is found.

For this reason, the exhaust gas is increased in the acceleration period immediately after the fuel cut-off period.

Therefore, the lambda closed loop control for executing in the acceleration period immediately after the fuel cut-off period does not start at 0%, but the lambda closed loop in the other acceleration period already executed before the fuel cut- Control is performed by setting the average value of the control values to the control start value.

Likewise, it is preferable that the acceleration period for reducing the exhaust gas is an acceleration period after the fuel cut-off period elapses, more specifically, an acceleration period immediately after the fuel cut-off period.

The reason for this is that the increase of the exhaust gas rapidly increases in the acceleration period immediately after the fuel cut-off period has elapsed, as mentioned briefly above.

FIG. 7 is a flowchart illustrating an operation of the apparatus shown in FIG. As shown only by way of example in FIG. 7, the method for reducing the exhaust gas of a vehicle proceeds to determine whether an abnormality is detected in the fuel system equipment related to the discharge of harmful exhaust gas in the electronic control unit 200 (S200 and S202).

If it is determined from the determination result of step S202 that there is an abnormality in the fuel system of the vehicle to such an extent that harmful exhaust gas is discharged (S204).

Thereafter, it is determined whether the acceleration section immediately after the fuel cutoff section arrives when the fuel cutoff section determined in step S204 arrives (S206).

If the arrival of the acceleration period is confirmed in step S206, an average value of the Lambda closed loop control values for the other acceleration periods before the fuel cut-off period stored in advance is loaded, and the average value of the Lambda closed loop control values To a lambda closed loop control start value (S208).

After the setting process is started, control for the acceleration period is performed through the Lambda closed loop control start value set at the start of the acceleration period to be controlled (S210).

Thereafter, when the driving of the vehicle is terminated, the above processes are also concluded (S212).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

In addition, the present invention can be applied to a fuel injection control system for an internal combustion engine in which the emission of harmful exhaust gas from the vehicle is diagnosed (that is, an abnormality occurs in the fuel system) Since the control for preventing the increase of the exhaust gas in the section is executed, it is not only a possibility of commercialization or sales, but also a possibility that can be practically and practically carried out, and thus the invention is industrially applicable.

100, 200: electronic control device 110, 210:
120, 220: Second judging unit 130, 230: Setting unit
140, and 240:

Claims (11)

Judging occurrence of malfunction or failure of the vehicle in the electronic control unit, which may have generated exhaust gas harmful to the atmospheric environment;
Determining a fuel cut-off period that follows when an error occurs;
Setting an average value of a lambda closed loop control value stored in advance in an idle section after the fuel cutoff period as a start value of a lambda closed loop control; And
And performing control for the idle period with the lambda closed loop control start value at the start of the idle period. The method according to claim 1,
The method of reducing exhaust gas of a vehicle according to any one of claims 1 to 3, wherein the Lambda closed loop control value based on a lambda closed loop control value applied to another idle period before the idle period And calculating and storing an average value of the average value. 3. The method according to claim 1 or 2,
And the idle period is a period immediately after the fuel cut-off period. 3. The method according to claim 1 or 2,
Wherein the determination of the occurrence of a malfunction or failure of the vehicle is performed through an OBD (On Board Diagnostics) 2 system. 3. The method of claim 2,
And the other idle period corresponds to a period immediately before the fuel cut-off period. Judging occurrence of malfunction or failure of the vehicle in the electronic control unit, which may have generated exhaust gas harmful to the atmospheric environment;
Determining a fuel cut-off period that follows when an error occurs;
Setting an average value of a lambda closed loop control value stored in advance for an acceleration period after the fuel cut-off period to a start value of a lambda closed loop control; And
And performing a control for the acceleration period with the lambda closed loop control start value at the start of the acceleration period. The method according to claim 6,
The method for reducing exhaust gas of a vehicle may include calculating a mean value of the lambda closed loop control value based on a lambda closed loop control value applied to another acceleration period before the acceleration period, The method further comprising the steps of: 8. The method according to claim 6 or 7,
Wherein the acceleration section is an initial acceleration section that arrives immediately after the fuel cut-off section. 9. The method of claim 8,
Wherein the initial acceleration period is a gear shift during an acceleration period. 8. The method according to claim 6 or 7,
Wherein the determination of the occurrence of a malfunction or failure of the vehicle is performed through an OBD (On Board Diagnostics) 2 system. 8. The method of claim 7,
And the other acceleration period corresponds to a period immediately before the fuel cut-off period.

Images