KR101628504B1 - An egr valve cleaning control method of the hybrid vehicle and an apparatus thereof - Google Patents

Abstract

The present invention relates to an EGR valve cleaning control method and apparatus for a diesel-hybrid vehicle. A method for controlling EGR valve cleaning of a diesel-hybrid vehicle according to an embodiment of the present invention includes a first determining step (SlOO) for determining whether a running mode of the vehicle is a hybrid running mode in an HCU; An engine stopping step (S200) of stopping the engine when it is determined in the first determining step (S100) that the hybrid running mode is selected; A first learning step (S300) of measuring and storing temporarily the amount of SOOT deposited in the EGR valve inlet after the engine stopping step (S200); A second determination step (S400) of determining whether the temporarily stored measured value exceeds the pre-stored SOOT deposition amount reference value after the first learning step (S300); And the second determination step (S400), when the measured value exceeds the pre-stored SOOT accumulation amount reference value, the SOOT amount accumulated in the EGR valve is measured and stored after the EGR valve is opened and closed a plurality of times And a second learning step (S500). According to the present invention, it is possible to maintain the optimum engine combustion condition in the diesel-hybrid vehicle by removing the SOOT deposited on the inflow path of the EGR valve while securing the quietness in the operation of the diesel-hybrid vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an EGR valve cleaning control method and an EGR valve control method for a hybrid vehicle,

The present invention relates to an EGR valve cleaning control method and apparatus for a hybrid vehicle, and more particularly, to an EGR valve cleaning control method for a hybrid vehicle for continuously monitoring an inflow path space of an EGR valve to maintain an optimal engine combustion condition And a control device.

A vehicle to which a diesel engine is applied is provided with an Exhaust Gas Recirculation (EGR) for recirculating a part of the exhaust gas to the INTAKE MANIFOLD in order to reduce NOx generated at a high temperature of the exhaust gas. However, when various incomplete combustion materials contained in the exhaust gas pass through the EGR valve and flow into the intake side of the engine, SOOT is deposited on the inflow path portion of the EGR valve, the inflow path of the EGR valve is continuously narrowed, The amount of gas is reduced. Accordingly, when the ECU is mapped on the basis of the first EGR valve inflow path, the emission may exceed the reference value.

Therefore, as shown in FIGS. 1 and 2, the vehicle to which the present diesel engine is applied is forcibly repeatedly opening and closing the EGR valve at the time of stopping the engine, recognizing the amount of the valve being closed, Continuous monitoring and learning of SOOT accumulation amount to. In addition, the EGR valve is forcibly repeatedly opened and closed each time the engine is stopped, so that SOOT accumulated in the inflow path of the EGR valve is closed at the time of closing, and SOOT powder after chopping is contained in the intake air at the time of opening. The SOOT maintains a dry state at high temperature and has a viscosity at low temperature in a wet state.

However, when the conventional EGR valve cleaning control method of a vehicle to which a diesel engine is applied is directly applied to a diesel-hybrid vehicle, the SOOT can be deposited in the wet state and deposited. That is, as shown in FIG. 3, when the operation cycle by the engine and the motor is repeated, the exhaust flow path is maintained at a low temperature state as compared with the diesel engine vehicle, so that the SOOT can be deposited in the wet state, In this case, the SOOT can not be removed sufficiently by repeated opening and closing of the EGR valve after the vehicle stops.

Further, when the EGR valve is repeatedly opened and closed each time the operation is completed by the motor, there is a problem in that the commerciality of the diesel-hybrid vehicle in which the quietness is required due to the operating noise of the EGR motor for opening and closing the EGR valve is deteriorated.

Published Japanese Patent Application No. 2003-0052034 (June 26, 2003)

SUMMARY OF THE INVENTION It is an object of the present invention to continuously monitor and learn the SOOT accumulation amount of an inflow path of an EGR valve and determine whether the EGR valve is repeatedly opened or closed based on the monitoring .

A method for controlling EGR valve cleaning of a hybrid vehicle according to an embodiment of the present invention includes a first determining step (SlOO) for determining whether a traveling mode of the vehicle is a hybrid traveling mode in an HCU; An engine stopping step (S200) of stopping the engine when it is determined in the first determining step (S100) that the hybrid running mode is selected; A first learning step (S300) of measuring and storing temporarily the amount of SOOT deposited in the EGR valve inlet after the engine stopping step (S200); A second determination step (S400) of determining whether the temporarily stored measured value exceeds the pre-stored SOOT deposition amount reference value after the first learning step (S300); And when it is determined in the second determining step (S400) that the measured value exceeds the pre-stored SOOT accumulation amount reference value, the SOOT amount accumulated in the EGR valve is measured and stored after the EGR valve is opened and closed a plurality of times And a second learning step (S500).

The engine stopping step (S200) includes: an instruction step (S210) of issuing an engine stop command to the ECU from the HCU; And a signal transmitting step (S220) of transmitting a stop signal to the engine from the ECU after the command step (S210).

The first learning step (S300) includes a first opening / closing step (S310) of opening and closing the EGR valve once; A first measurement step (S320) of measuring the amount of SOOT deposited on the EGR valve by the measurement unit after the first opening and closing step (S310); And a first storing step (S330) of temporarily storing measured values in the memory after the first measuring step (S320).

 The second learning step S500 includes a second opening and closing step S510 for removing the SOOT deposited on the EGR valve when it is determined that the measured value exceeds the previously stored SOOT accumulation amount reference value in the second determining step S400 ); A second measuring step (S520) of measuring the amount of SOOT deposited on the EGR valve by the measuring unit after the second opening and closing step (S510); And a second storing step (S530) of temporarily storing measured values in the memory after the second measuring step (S520).

The second opening and closing step (S510) opens and closes the EGR valve a plurality of times to close the SOOT deposited in the inflow path of the EGR valve at the time of closing, and to remove the SOOT powder contained in the intake air at the time of opening .

The EGR valve cleaning control apparatus for a hybrid vehicle according to another embodiment of the present invention may further include a measuring unit (e.g., a controller) for measuring the amount of SOOT deposited on the EGR valve in the first learning step (S400) or the second learning step (S500) 100); A controller 200 for comparing the SOOT amount measured by the measuring unit 100 with a pre-stored SOOT accumulation amount reference value and determining whether to open or close the EGR valve; And an EGR valve driver 300 for opening and closing the EGR valve in the first learning step S400 or the second learning step S500.

The control unit 200 determines whether the running mode of the vehicle is the hybrid running mode in the first determining step S100, commands the ECU to stop the engine in the command step S210, The HCU 210 determines whether the measured value temporarily stored in step S400 exceeds the pre-stored SOOT accumulation amount reference value.

The control unit 200 includes an ECU 220 for transmitting a stop signal to the engine in the signal transmission step S220.

The control unit 200 includes a memory 230 for temporarily storing or storing the measured SOOT amount in the first learning step (S300) or the second learning step (S500).

As described above, according to the present invention, it is possible to maintain the optimum engine combustion condition in the hybrid vehicle by removing the SOOT accumulated in the inflow path of the EGR valve while securing the quietness in the operation of the hybrid vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining the behavior of an EGR valve of a conventional diesel engine-applied vehicle. Fig.
2 is a view for explaining a part of an EGR valve of a vehicle to which a conventional diesel engine is applied.
3 is a view for explaining a traveling mode of the hybrid vehicle;
4 is a flowchart of an EGR valve cleaning control method of a hybrid vehicle according to an embodiment of the present invention.
5 is a block diagram of an EGR valve cleaning control apparatus of a hybrid vehicle according to another embodiment of the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term to describe its invention in the best way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a flowchart of an EGR valve cleaning control method of a hybrid vehicle according to an embodiment of the present invention. Referring to FIG. 4, an EGR valve cleaning control method for a hybrid vehicle according to an embodiment of the present invention includes a first determining step S100, an engine stopping step S200, a first learning step S300, (S400), and a second learning step (S500).

In a first determination step (SlOO), the hybrid control unit (HCU) determines whether the traveling mode of the vehicle is the hybrid traveling mode. This is because the EGR valve is not closed to recirculate the exhaust gas when the engine is running.

The engine stopping step S200 is a step of stopping the engine operation when it is determined in the first determining step S100 that the hybrid running mode is selected. The engine stopping step S200 may include a command step S210 for issuing an engine stop command to the ECU from the hybrid control unit HCU and a stop signal from the ECU to the engine after the command step S210 And a signal transmitting step (S220) for transmitting the signal. That is, in the case of the hybrid running mode, the vehicle is driven by the motor and the engine is stopped. In this case, the conventional diesel engine-applied vehicle performs EGR cleaning for opening and closing the EGR valve several times, but in the case of the present invention, it is judged whether EGR cleaning is necessary or not. Hereinafter, this will be described in detail.

In the first learning step (S300), after the engine stop step (S200), the SOOT amount accumulated in the EGR valve inlet is measured and temporarily stored. The first learning step S300 includes a first opening and closing step S310 for opening and closing the EGR valve once, a first opening and closing step S310 for measuring the amount of SOOT deposited on the EGR valve in the measuring part after the first opening and closing step S310, And a first storing step (S330) of temporarily storing measured values in the memory after the measuring step (S320) and the first measuring step (S320). That is, the amount of SOOT deposited on the present EGR valve can be grasped by opening and closing the EGR valve once and measuring the amount of SOOT deposited on the EGR valve. In addition, these measured values can be temporarily stored to obtain an object to be compared with the accumulated SOOT accumulation amount.

The second determination step (S400) is a step of determining whether the temporarily stored measured value exceeds the previously stored SOOT accumulation amount reference value after the first learning step (S300). That is, the second determination step (S400) determines whether EGR cleaning of the hybrid vehicle according to the present invention is necessary. The stored SOOT sediment reference value can be determined experimentally. If it is determined that the measured value temporarily stored in the second determination step (S400) does not exceed the pre-stored SOOT accumulation amount reference value, the EGR valve is not repeatedly opened and closed. Therefore, the EGR valve opening / It is possible to prevent the deterioration of the merchantability.

In the second learning step S500, if it is determined in the second determination step (S400) that the measurement value exceeds the pre-stored SOOT accumulation amount reference value, the EGR valve is opened and closed a plurality of times, And the SOOT amount is measured and stored.

The second learning step S500 includes a second opening and closing step S510 for removing the SOOT deposited on the EGR valve when it is determined that the measured value exceeds the previously stored SOOT accumulation amount reference value in the second determining step S400 (S520) of measuring the amount of SOOT deposited on the EGR valve by the measuring unit after the second opening / closing step (S510) and storing the measured value in the memory after the second measuring step (S520) And a second storing step S530.

The second opening and closing step (S510) opens and closes the EGR valve a plurality of times to close the SOOT deposited in the inflow path of the EGR valve at the time of closing, and to remove the SOOT powder contained in the intake air at the time of opening .

That is, if it is determined in the second determination step (S400) that the measured value exceeds the pre-stored SOOT accumulation amount reference value, it is determined that the EGR cleaning of the vehicle is necessary. Thus, the second opening / closing step (S510) Remove the SOOT deposited in the inflow path. Thereafter, the second measurement step S520 and the second storage step S530 are performed, and based on this, the space of the inflow path of the EGR valve is continuously monitored to maintain the optimum engine combustion condition in the hybrid vehicle.

5 is a block diagram of an EGR valve cleaning control apparatus for a hybrid vehicle according to another embodiment of the present invention. Referring to FIG. 5, the EGR valve cleaning control apparatus of the hybrid vehicle according to another embodiment of the present invention includes a measuring unit 100, a control unit 200, and an EGR valve driving unit 300.

The measuring unit 100 measures the SOOT amount accumulated in the EGR valve in the first learning step (S400) or the second learning step (S500). The measuring unit 100 may include a sensor that recognizes the amount of the EGR valve that is in the closed state with the EGR valve closed and measures the SOOT accumulation amount of the EGR valve inflow path, but the present invention is not limited thereto.

The control unit 200 compares the SOOT amount measured by the measuring unit 100 with the pre-stored SOOT accumulation amount reference value to determine whether to open or close the EGR valve. The controller 200 includes an HCU (Hybrid Control Unit) 210, an ECU (Electronic Control Unit) 220, and a memory 230.

The HCU 210 is a device that is provided in a hybrid vehicle and that integrally controls an ECU (Electronic Control Unit), a TCU (Transmission Control Unit), an MCU (Micro Controller Unit), a BMS (Battery Management System), and a FATC And is a top-level controller that can control torque, speed, and fuel consumption according to the driving situation of the hybrid vehicle. The HCU 210 determines whether the running mode of the vehicle is the hybrid running mode in the first determining step S100, commands the engine stop command to the ECU in the command step S210, (S400) determines whether the temporarily stored measured value exceeds the pre-stored SOOT accumulation amount reference value.

The ECU 220 is an electronic control device for controlling the state of an engine, an automatic transmission, an ABS, or the like of a vehicle by a computer, and transmits a stop signal to the engine in the signal transmission step S220. The memory 230 temporarily stores or stores the measured SOOT amount in the first learning step (S300) or the second learning step (S500).

The EGR valve driving unit 300 opens and closes the EGR valve in the first learning step (S400) or the second learning step (S500). The EGR valve driver 300 may be a solenoid actuator, but is not limited thereto, and a conventional actuator may be used.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and will be fully understood by those of ordinary skill in the art. The present invention is not limited thereto. It will be apparent to those skilled in the art that various substitutions, modifications and variations are possible within the scope of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are included in the scope of the present invention .

100 measuring part
200 control unit
210 HCU
220 ECU
230 memory
300 EGR valve driver
S100 < tb >
S200 engine stop phase
S210 command step
S220 signal transmission step
S300 First learning step
S310 First opening and closing step
S320 First measurement step
S330 First storage step
S400 Second judgment step
S500 Second learning step
S510 Second opening and closing step
S520 Second measuring step
S530 Second storing step

Claims (9)

A first determination step (S100) of determining whether the running mode of the vehicle is the hybrid running mode in the HCU;
An engine stopping step (S200) of stopping the engine when it is determined in the first determining step (S100) that the hybrid running mode is selected;
A first learning step (S300) of measuring and storing temporarily the amount of SOOT deposited in the EGR valve inlet after the engine stopping step (S200);
A second determination step (S400) of determining whether the temporarily stored measured value exceeds the pre-stored SOOT deposition amount reference value after the first learning step (S300); And
And a second determination step (S400) of, when it is determined that the measured value exceeds the pre-stored SOOT accumulation amount reference value, measuring the SOOT amount accumulated in the EGR valve after storing the EGR valve a plurality of times 2 learning step (S500);
The EGR valve cleaning control method of the hybrid vehicle according to claim 1,
The first learning step (S300) includes a first opening / closing step (S310) of opening and closing the EGR valve once;
A first measurement step (S320) of measuring the amount of SOOT deposited on the EGR valve by the measurement unit after the first opening and closing step (S310); And
A first storing step (S330) of temporarily storing measured values in the memory after the first measuring step (S320);
And the EGR valve is controlled by the EGR valve. The method according to claim 1,
The engine stopping step (S200) includes: an instruction step (S210) of issuing an engine stop command to the ECU from the HCU; And
A signal transmitting step (S220) of transmitting a stop signal to the engine from the ECU after the command step (S210);
And the EGR valve is controlled by the EGR valve. delete The method according to claim 1,
The second learning step S500 includes a second opening and closing step S510 for removing the SOOT deposited on the EGR valve when it is determined that the measured value exceeds the previously stored SOOT accumulation amount reference value in the second determining step S400 );
A second measuring step (S520) of measuring the amount of SOOT deposited on the EGR valve by the measuring unit after the second opening and closing step (S510); And
A second storing step (S530) of temporarily storing measured values in the memory after the second measuring step (S520);
And the EGR valve is controlled by the EGR valve. 5. The method of claim 4,
The second opening and closing step (S510) opens and closes the EGR valve a plurality of times to close the SOOT deposited in the inflow path of the EGR valve at the time of closing, and to remove the SOOT powder contained in the intake air at the time of opening Wherein said EGR valve is controlled by said EGR valve. An EGR valve cleaning control apparatus for a hybrid vehicle for performing an EGR valve cleaning control method of a hybrid vehicle according to any one of claims 1, 2, 4, and 5,
A measuring unit (100) for measuring the amount of SOOT deposited on the EGR valve in the first learning step (S400) or the second learning step (S500);
A controller 200 for comparing the SOOT amount measured by the measuring unit 100 with a pre-stored SOOT accumulation amount reference value and determining whether to open or close the EGR valve; And
An EGR valve driver 300 for opening / closing the EGR valve in the first learning step S400 or the second learning step S500;
And an EGR control valve for controlling the EGR valve. The method according to claim 6,
The control unit 200 determines whether the driving mode of the vehicle is the hybrid driving mode in the first determining step S100 and instructs the ECU 220 to stop the engine in the command step S210, S400) determines whether or not the temporarily stored measured value exceeds a pre-stored SOOT accumulation amount reference value. The EGR valve cleaning control apparatus of claim 1, wherein the HCU (210) The method according to claim 6,
Wherein the controller (200) includes an ECU (220) for transmitting a stop signal to the engine in a signal transmission step (S220). The method according to claim 6,
The control unit 200 includes a memory 230 for temporarily storing or storing the measured SOOT amount in the first learning step S300 or the second learning step S500. Valve cleaning control device.

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