KR101954291B1 - Fail detection method for back pressure valve and egr valve integrated module - Google Patents

Abstract

The present invention relates to a failure detection method of an EGR valve module for detecting a failure of a back pressure valve and an EGR valve.
An EGR valve module failure detection method and an EGR valve module according to an embodiment of the present invention include an integrated backpressure valve for regulating the amount of exhaust gas circulated on a path for recirculating a part of exhaust gas discharged from a combustion chamber of an automotive engine to an intake side, An EGR valve module comprising: (a) increasing a driving force of a motor; (b) driving the back pressure valve and the EGR valve interlocked with the cam driven by the driving force; And (c) measuring an opening time of the back-pressure valve and the EGR valve, respectively, and judging that the failure occurs when the time is longer than a predetermined time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a failure detection method for an integrated type back pressure valve and an EGR valve module,

The present invention relates to a failure detection method of an EGR valve module for detecting a failure of a back pressure valve and an EGR valve.

Diesel engines are more fuel-efficient than gasoline and are widely used in commercial vehicles such as passenger cars, buses, and trucks and throughout the industry. However, the exhaust gas of diesel engine vehicles contains harmful substances such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Nitrogen oxides (NOx) are generated by the combination of oxygen and nitrogen at high pressure and high temperature, which causes corrosion of buildings and destruction of ecosystems as a major cause of acid rain, and causes human respiratory diseases such as bronchitis, pneumonia and asthma .

Generally, the term "exhaust gas recirculation (EGR)" refers to a technique in which a part of the exhaust gas of the engine is circulated back to the intake system of the engine to utilize the exhaust gas together with the outside air for combustion. And there is an advantage that NOx discharged into the atmosphere can be reduced by recirculating the exhaust gas.

EGR can be divided into HP EGR (high pressure EGR) and LP EGR (low pressure EGR) depending on the position where the exhaust gas is recirculated. Specifically, the HP EGR utilizes a high-temperature and high-pressure exhaust gas having a low pressure drop as an EGR gas by using a recirculation flow path connected from the turbine front end of the turbocharger to the intake manifold side. In contrast, the LP EGR has a difference in that exhaust gas having a relatively lower pressure drop compared to HP EGR is used as the EGR gas by using the recirculation flow path connected from the rear end of the turbine to the outside air suction flow path side of the compressor front end.

The dual LP EGR is located downstream of the DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and / or SCR (Selective Catalytic Reduction), where the pollutants in the recirculated gas are relatively small compared to HP EGR . In addition, LP EGR has an advantage in that it is relatively advantageous in comparison with HP EGR in terms of intake-on-cooling and EGR cylinder distribution. Recently, attention has been paid to the fact that LP EGR has an advantageous effect on the improvement of fuel efficiency. Thus, attention is being paid to LP EGR in order to apply LP EGR to a vehicle equipped with a diesel engine as well as a gasoline engine.

6 is a diagram showing a method for detecting a failure of an exhaust gas recirculation valve of an EGR valve unit according to the prior art.

Specifically, referring to FIG. 6, the EGR valve is operated and an EGR valve operation step for monitoring the operation state of the EGR valve, the rpm and the intake air pressure of the engine, and the combustion control state of the engine are continuously adjusted, A measurement value calculation step of calculating the normal operation value of the engine; an EGR valve closing step in which the EGR valve is forcibly closed; and an EGR valve for calculating the abnormal operation value of the engine in a state in which the EGR valve is closed. And an operation value comparison step of determining whether the difference between the normal operation value and the abnormal operation value is smaller than the threshold value. When the difference between the normal operation value and the abnormal operation value is smaller than the threshold value, It is possible to detect a failure of the exhaust gas recirculation valve.

However, according to the related art, the consumption of the battery is increased due to an increase in the load of the motor for operating the EGR valve, resulting in a large shock to the product and a large noise generation. Therefore, there arises a problem that the noise is generated in the actual product and the durability of the resulting product is shortened.

Japanese Patent Application Laid-Open No. 10-2015-0115043

In order to overcome the problems of the related art, an embodiment of the present invention operates a cam interlocked with a back pressure valve and an EGR valve by a driving force of a motor to transmit a driving force to a back pressure valve and an EGR valve, And to improve the durability of the product by mitigating the impact, and to provide a fault detection method of an integrated backpressure valve and an EGR valve module.

According to an aspect of the present invention, there is provided an integrated backpressure valve and an EGR valve module for regulating the amount of exhaust gas circulated on a path for recirculating a part of exhaust gas discharged from a combustion chamber of an automobile engine to an intake side,

(a) increasing the driving force of the motor;

(b) driving the back pressure valve and the EGR valve interlocked with the cam driven by the driving force; And

(c) measuring an opening time of the back pressure valve and the EGR valve, respectively, and judging that the valve is broken if the time is longer than a predetermined time;

. ≪ / RTI >

More specifically, the step (c) includes the steps of: (i) driving and stopping the motor until the EGR valve is driven only for detecting the failure of the EGR valve; And (ii) measuring a time until the opening degree of the EGR valve becomes minimum, and determining that the EGR valve is in failure if the time is longer than a predetermined time.

The step (c) includes the steps of: (iii) driving and stopping the motor until the back pressure valve is driven only for detecting the failure of the back pressure valve; And (iv) measuring a time until the opening degree of the back pressure valve reaches a maximum, and judging that the back pressure valve is faulty if the time is longer than a predetermined time.

According to the present invention, the step of detecting the failure of the EGR valve module and learning the sensor may include:

(A) a setting step of setting a normal operating condition to operating conditions when the EGR valve module is operating normally;

(B) a learning step of measuring and learning the opening time of the back pressure valve and the EGR valve, respectively; And

(C) a step of judging a failure or a normal state of the back pressure valve and the EGR valve;

. ≪ / RTI >

Preferably, the learning step comprises:

The back pressure valve is in a non-rotating state while the first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the third guide portion of the second pin guide hole And measuring the opening time of the EGR valve and learning.

Further, in the learning step,

The back pressure valve is rotated while the first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the fourth guide portion of the second pin guide hole, And a step of measuring the opening time of the door.

In one specific example,

The EGR valve is in a non-rotating state while the first pin of the first link moves in the second guide portion of the first pin guide hole and the second pin of the second link moves in the fifth guide portion, And measuring and measuring time.

According to another aspect of the present invention, there is provided an EGR valve module characterized by being controlled by a failure detection method of an EGR valve module.

According to one embodiment of the present invention, it is possible to perform the failure detection of the back pressure valve and the EGR valve of the EGR valve module without shortening the durability of the motor and the battery after stopping the engine, It is possible to simultaneously perform the learning of the sensors provided in the sensors.

In addition, by integrating control of the integrated back pressure valve and EGR valve module with ACV (Air Control Valve), it is possible to reduce the ECU control load and improve the fuel efficiency due to the weight reduction of the vehicle.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an overall schematic view of an internal combustion engine for explaining a position where a valve module of the present invention is mounted; FIG.
2 is a view illustrating a forward operation configuration of a valve module according to one embodiment of the present invention.
3 is a diagram illustrating a reverse operation configuration of a valve module according to one embodiment of the present invention.
4 is a view showing a method of detecting a failure of the EGR valve module failure detection method according to an embodiment of the present invention.
5 is a view illustrating a method of performing failure detection and sensor learning of an EGR valve module according to an embodiment of the present invention.
6 is a diagram showing a method for detecting a failure of an exhaust gas recirculation valve of an EGR valve unit according to the prior art.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

It is to be understood that when an element is referred to as being connected or connected to another element, it may be directly connected or connected to the other element, but it should be understood that there may be other elements in between.

The term "connection" as used herein means a direct connection or indirect connection between one member and another member, and may refer to all physical connections such as adhesion, attachment, fastening, bonding, and bonding.

Also, the expressions such as 'first, second, (a), (b), (c)', etc. are expressions used only for distinguishing a plurality of configurations (or steps) And the like.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. Means that a feature, number, step, operation, element, component, or combination of features described in the specification is meant to imply the presence of one or more other features, A step, an operation, an element, a component, or a combination thereof.

Hereinafter, the EGR valve module of the present invention will be described in detail with reference to the drawings.

First, the overall configuration of the internal combustion engine of the present invention will be briefly described with reference to Fig. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an overall schematic view of an internal combustion engine for explaining a position where a valve module of the present invention is mounted; FIG.

The combustion chamber of the engine of the present invention has an intake manifold and an exhaust manifold. A compressor of a turbocharger is provided on a flow path for supplying intake air to the intake manifold side. An intercooler is provided downstream of the compressor, and an intake throttle (not shown) is provided to control the amount of intake air flowing into the intake manifold.

The exhaust manifold is connected to an exhaust passage for exhausting the exhaust gas to the atmosphere. A turbine (T.) of the turbo charger is connected to the exhaust flow path, and a DPF and / or a catalytic device and a muffler are installed downstream of the turbine T. as an exhaust post-treatment device for purifying the exhaust gas.

In addition, an exhaust gas recirculation (EGR) system for recirculating a part of the exhaust gas to the intake system may be installed in the exhaust passage. The EGR system is typically provided with an EGR cooler for reducing the temperature of the exhaust gas at a high temperature and an EGR valve for controlling the flow rate of the exhaust gas flowing into the EGR passage.

As the EGR system, the LP EGR system is applied to the internal combustion engine of the present invention. The LP EGR is advantageous in improving the fuel efficiency as well as the intake-on-cooling and the EGR cylinder distributing performance as described above in the background art, but it must follow the problem of forming the back pressure for recirculating the exhaust gas. Therefore, in the present invention, an EGR valve and a 3-way valve can be constructed as a valve for generating back pressure for LP EGR. This will be described in detail later.

More specifically, the LP EGR of the present invention is branched from the exhaust passage at the front end of the muffler to circulate a part of the exhaust gas to the intake system. Here, an exhaust gas recirculation cooler and an exhaust gas flowing into the EGR passage And an EGR valve for controlling the EGR valve.

The fresh air received in the air cleaner AC flows to the compressor C. side of the turbocharger via the intake passage 20. The exhaust air recirculated through the EGR passage before entering the compressor C. Mixed. The flow direction of the mixer faces the compressor (C.) side.

For reference, a crank angle sensor for detecting the rotation of the crankshaft of the internal combustion engine or an excel sensor (position sensor or opening angle sensor, etc.) for outputting a signal according to the opening degree of the excel pedal may be provided. The target output of the vehicle and thus the fuel injection amount of the engine combustion chamber, the target air amount to be introduced into the intake manifold, and the most important EGR rate (EGR rate) in the opening of the EGR valve of the present invention are calculated using the crank angle sensor and the excel sensor Can be determined.

For reference, the valve module of the present invention may be provided at a portion indicated by a dotted line in FIG.

Based on the configuration of the internal combustion engine as described above, the characteristics of the valve module of the present invention will be described in more detail with reference to Fig.

FIG. 2 is a view illustrating a forward operation configuration of a valve module according to one embodiment of the present invention, and FIG. 3 is a diagram illustrating a reverse operation configuration of a valve module according to an embodiment of the present invention. Respectively.

Referring to FIGS. 2 to 4 together, the integral back pressure and EGR valve module includes an EGR valve 100, a back pressure valve 200, a first cam 300 interlocked with the EGR valve 100, And a second cam (400) interlocked with the second cam (400).

According to the present invention, the back pressure valve (200) is disposed in the intake passage (20) for drawing a fresh air from the outside. The EGR valve 100 is disposed on the LP EGR passage 10 connected to the longitudinal direction of the intake passage 20 in a diagonal direction at a predetermined angle and recirculating the exhaust gas discharged from the engine and passed through the turbine have. Here, both the EGR valve 100 and the back pressure valve 200 may be flap valves.

Here, the EGR valve 100 means an LP EGR valve, and the back-pressure valve 200 can mean a back-pressure generating valve for forming a back pressure at a junction point between the EGR passage 10 and the intake passage 20 . The back-pressure valve 200 also serves to regulate the amount of fresh air introduced, but also assists the EGR valve to facilitate recirculation and mixing of the EGR gas.

According to the present invention, the first cam 300 is formed with a first pin guide hole 310 to which the first pin 120 of the first link 110 coupled with the EGR valve 100 is coupled, have.

The first pin guide hole 310 includes a first guide portion 311 for driving the back pressure valve 200 to rotate in the forward direction when the EGR valve 100 rotates in the forward direction, And a second guide portion 312 for driving the back pressure valve 200 so as to rotate in the forward direction when the valve body 100 is in the non-rotating state.

Here, the first pin guide hole 310 is a curved section divided into at least two sections, and is divided into two sections in the figure. Here, the curved sections divided into the first guide part 311 and the second guide part 312 may have different radii of curvature. The first pin 120 of the first link 110 interlocked with the EGR valve 100 is connected to the first pin guide hole 310 of the first pin guide hole 310, And is fastened to the hole 310.

The second cam 400 has a second pin guide hole 410 which is coupled to the second pin 220 of the second link 210 interlocked with the back pressure valve 200.

The second pin guide hole 410 includes a third guide portion 411 in which the back pressure valve 200 does not rotate when the EGR valve 100 rotates in the forward direction, And a fifth guide portion 413 for driving the back-pressure valve 200 to rotate in the reverse direction when the EGR valve 100 is in the non-rotating state, and a fourth guide portion 412 for driving the back- .

The first guide part 311 and the second guide part 312 are divided areas in which the first pin 120 is guided and the third guide part 411 and the fourth guide part 412, And the fifth guide part 413 may refer to a divided area where the second pin 220 is guided. These regions may be indicated by dashed lines as shown in Fig.

Similarly to the first pin guide hole 310 described above, the second pin guide hole 410 has a curved section divided into two or more sections, and is divided into three sections in the figure. Here, the curved sections divided into the third guide part 411, the fourth guide part 412 and the fifth guide part 413 may have centers of curvature radii different from each other. The centers of curvature radii of the second pin guide holes 410 are configured to be located in the inner direction of the main body of the second cam 400 like the centers of curvature radii of the first pin guide hole 310, The second pin 220 of the second link 210 interlocked with the second pin guide hole 410 is fastened to the second pin guide hole 410.

The second pin 220 of the second link 210 engaged with and engaged with the second pin guide hole 410 formed in the second cam 400 is supported by the third guide portion 411 When the EGR valve 100 is moved in the counterclockwise direction, the back pressure valve 200 remains open and is not rotated. That is, the first pin 120 of the first link 110 interlocked with the EGR valve 100 moves in the first guide portion 311 of the first pin guide hole 310 and the EGR valve 100 rotates And the back pressure valve 200 does not rotate even if the second pin 220 of the second link 210 moves in the third guide portion 411 of the second pin guide hole 410.

When the second pin 220 of the second link 210 engaged with and engaged with the second pin guide hole 410 formed in the second cam 400 moves in the fourth guide portion 412 The back pressure valve 100 rotates counterclockwise from the open state to the closed state while the EGR valve 100 rotates counterclockwise. That is, the first pin 120 of the first link 110 interlocked with the EGR valve 100 moves in the first guide portion 311 of the first pin guide hole 310 and the EGR valve 100 rotates And the second pin 220 of the second link 210 is moved in the fourth guide part 412 of the second pin guide hole 410 so that the back pressure valve 100 is closed from the open state. And is rotated counterclockwise.

Meanwhile, when the second pin 220 of the second link 210 coupled with and engaged with the second pin guide hole 410 formed in the second cam 400 moves in the fifth guide portion 413 When the EGR valve 100 is in the closed state, the back pressure valve 100 rotates in the counterclockwise direction to be in the closed state. That is, while the first pin 120 of the first link 110 linked with the EGR valve 100 moves in the second guide portion 312 of the first pin guide hole 310, the EGR valve 100 When the second pin 220 of the second link 210 is moved in the fifth guide portion 412 of the second pin guide hole 410 and the back pressure valve 100 is in the closed state And is rotated counterclockwise.

At this time, the first cam 300 having the first pin guide hole 310 and the second cam 400 having the second pin guide hole 410 are disposed outside the intake air flow path and the LP EGR flow path It is located on the actuator axis which is located.

In the integrated back pressure and EGR valve module according to the embodiment of the present invention, the valve units in which the EGR valve and the back pressure valve are separately controlled according to the prior art have been disclosed, but this increases the cost increase and control complexity. The present invention proposes only the structure for the valve module including the EGR valve 100, the back pressure valve 200 and the cams 300 and 400 interlocked by the respective links 330 and 430.

The EGR valve 100 and the back pressure valve 200 are connected to the first cam 300 and the second link 210 which are coupled to the first pin 120 of the first link 110, And the second cam 400 coupled to the second pin 220 of the second cam 220.

The first cam 300 interlocks with the EGR valve 100 by the first pin 120 of the first link 110 and the second cam 400 interlocks with the EGR valve 100 of the second link 210, And is linked to the back pressure valve 200 by the second fin 220. [

The first pin 120 of the first link 110 interlocked with the EGR valve 100 moves from the first guide portion 311 of the first pin guide hole 310 to the first guide portion 311 of the EGR valve 100, , Only the fresh air flows on the intake flow path 20. The first back pressure valve 200 is opened in a full open state to maintain the open state and the second pin 220 interlocked with the back pressure valve 200 moves in the third guide portion 411 . That is, when the second pin 220 interlocked with the back pressure valve 200 is positioned in the third guide portion 411, the initial back pressure valve 200 is opened in a full open state to open And is in a non-rotating state.

The first pin 120 of the first link 110 interlocked with the EGR valve 100 moves counterclockwise along the first guide portion 311 of the first pin guide hole 310, When the second pin 220 of the second link 210 interlocked with the valve 200 moves in the third guide portion 411, the back pressure valve 200 is in the non-rotating state. When the second pin 220 of the second link 210 linked to the back pressure valve 200 moves in the fourth guide portion 412, the back pressure valve 200 is closed from the open state to the closed state, And rotates in the opposite direction. Therefore, when the EGR valve 100 is opened at a predetermined opening angle or more, EGR gas is supplied to the intake passage 10 side, and the supplied EGR gas is mixed with the fresh air.

When the EGR valve 100 rotates counterclockwise in the third guide part 411 and the fourth guide part 412, the first pin 110 of the first link 110 is interlocked When the back pressure valve 200 rotates counterclockwise in the fifth guide part 413, the first cam 300 rotates clockwise and the second pin 220 of the second link 210 rotates clockwise, The second cam 400 is rotated in the counterclockwise direction.

The first pin 120 of the first link 110 interlocked with the EGR valve 100 moves in the first guide portion 311 of the first pin guide hole 310 and the EGR valve 100 moves to the maximum opening The EGR gas is supplied only to the downstream of the intake passage 10, while the back pressure valve 200 interlocked with the second cam 400 is fully closed. At this time, a maximum back pressure is formed on the downstream side of the intake passage 10 by the back pressure valve 200, so that the supply rate of the EGR gas is further increased.

On the other hand, when the first pin 120 of the first link 110 interlocked with the EGR valve 100 moves in the second guide portion 312 so that the EGR valve 100 is in the non-rotating state and the second cam When the second pin 220 of the second link 210 linked with the back pressure valve 400 moves in the fifth guide portion 413, the second cam 400 interlocked with the back pressure valve 200 is rotated counterclockwise Direction.

The method for detecting failure in an EGR valve module according to the present invention includes the steps of (a) increasing the driving force of the motor (S100), (b) increasing the driving force of the motor in order to regulate the amount of exhaust gas circulated on the path for recirculating a part of the exhaust gas discharged from the combustion chamber of the automobile engine to the intake side, (b) driving the back pressure valve and the EGR valve interlocked with the cam driven by the driving force (S120). (C) measuring an opening time of the back pressure valve and the EGR valve, respectively, and judging that the failure occurs when the time is longer than a predetermined time (S130).

Conventionally, since the driving force converted by the gear is directly connected to the EGR valve to drive the EGR valve, the back pressure valve is driven. Therefore, in order to detect the failure, the back pressure valve must be operated in a state in which the EGR valve is moving. Which increases the consumption of the battery.

However, according to the present invention, there is a gear for increasing the driving force of the motor, and the increased driving force drives the back pressure valve and the EGR valve by the cam. In the forward driving mode, the EGR valve is operated. have. As described above, the back pressure valve or the EGR valve according to the present invention is configured such that a section, which is respectively driven by a first cam coupled to a first pin of a first link and a second cam coupled to a second pin of a second link, Therefore, it is possible to improve the reliability and accuracy of the failure judgment by making a failure judgment on the back pressure valve or the EGR valve, respectively.

Preferably, in the method for detecting failure of the EGR valve module according to the present invention, (c) measuring the opening time of the back-pressure valve and the EGR valve, Or a process of detecting a failure of the back pressure valve.

First, in order to detect a failure of the EGR valve, as described above, the EGR valve is rotated counterclockwise and the back pressure valve is in the non-rotating state (i) so that the first pin of the first link, The first guide portion of the pin guide hole moves to rotate the EGR valve and the second pin of the second link moves in the third guide portion of the second pin guide hole to drive and stop the motor until only the EGR valve is driven S131). (Ii) The time until the opening degree of the EGR valve becomes minimum is measured, and if it is longer than the predetermined time, the EGR valve is judged as a failure (S132).

Alternatively, in order to detect a failure of the back pressure valve, the back pressure valve is rotated counterclockwise and the EGR valve is in the non-rotating state (iii) The second pin of the link is moved by the fifth guide portion to drive and stop the motor until only the back pressure valve is driven (S133). Next, (iv) measuring the time until the opening degree of the back pressure valve becomes maximum and judging that the back pressure valve is faulty (S134) if it is longer than the predetermined time.

Further, according to the present invention, it is possible to simultaneously perform the learning of the sensor while performing the failure detection of the back pressure valve and the EGR valve, and in some cases, the cam profile for icing and cleaning can be modified.

5 is a view illustrating a method of performing failure detection and sensor learning of an EGR valve module according to an embodiment of the present invention.

Referring to FIG. 5, the step of detecting the failure and learning the sensor of the EGR valve module preferably sets the normal operating conditions to the operating states when the EGR valve module operates normally (S210). Next, the normal operation region in which the EGR valve module operates and the abnormal operation region in which the EGR valve module does not operate are divided into (b) the opening time of the back pressure valve and the EGR valve are respectively measured and learned and stored (S220). (C) determining whether the back pressure valve and the EGR valve are malfunctioning or normal by using the learned opening times of the back pressure valve and the time difference between the back pressure valve and the learned opening times of the EGR valve and the EGR valve, (S230). The time until the opening degree of the valves reaches the maximum is measured, and it is judged that the valve is broken if it is longer than the predetermined time.

Here, the (b) learning step can be divided into the following steps as follows.

First, while the first pin of the first link is moving in the first guide portion, the back pressure valve is opened and is in the non-rotating state, and while the second pin of the second link is moving in the third guide portion of the second pin guide hole The first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the first guide portion of the first pin guide hole when the learning is performed by measuring the opening time of the EGR valve while the EGR valve is rotating, While the second pin of the second pin guide hole is moving in the third guide portion of the second pin guide hole, the back pressure valve is in the non-rotating state and the opening time of the EGR valve is measured and learned.

Next, while the back pressure valve rotates while the first pin of the first link moves in the first guide portion and the second pin of the second link moves in the fourth guide portion of the second pin guide hole, the EGR valve rotates The first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the (b-2) The back pressure valve is rotated counterclockwise while the fourth guide portion of the second pin guide hole moves, and the opening time of the EGR valve is measured and learned. In this step, the opening time of the back pressure valve may be measured and learned.

When the first pin of the first link is moved in the second guide portion, the back pressure valve is rotated and closed, and the second pin of the second link is moved in the fifth guide portion of the second pin guide hole, (3) the first pin of the first link moves in the second guide portion of the first pin guide hole, and the second pin of the second link The EGR valve is in a non-rotating state while the second pin is moving in the fifth guide portion, and the opening time of the back pressure valve is measured and learned.

Note that the expressions (b-1), (b-2), and (b-3) above are merely for distinguishing each step, not for the priority of each step.

Thus, by learning by the determination method for measuring the opening time of the back pressure valve and the EGR valve, it is possible to accurately and quickly determine the failure or normal of the EGR valve module.

After setting the duty limit of the motor, check whether the flap can rotate at a specific duty limit during reverse rotation and whether the flap returns to its original position after the motor is turned off. Check whether the back pressure valve or EGR valve is faulty Can be confirmed.

Therefore, the failure detection method of the EGR valve module according to the embodiment of the present invention can perform the failure detection of the back pressure valve and the EGR valve of the EGR valve module without shortening the durability of the motor and the battery after stopping the engine, And at the same time learning the sensor provided in the EGR valve module at the same time, thereby improving the accuracy of the failure judgment.

Also, in the failure detection method of the integrated type back pressure valve and the EGR valve module according to the embodiment of the present invention, the ECU control load is reduced by integrating the control of the EGR valve module and the ACV into one, .

Further, the failure detection method of the integral type back pressure valve and the EGR valve module according to the embodiment of the present invention is more accurate than the conventional failure detection method using the sensor provided in the engine and the EGR without using the conventional expensive EGR flow sensor. Can be detected. Further, since the EGR failure is detected by using the sensor provided in the conventional vehicle without any additional device, the design for installing the additional device is eliminated and the overall manufacturing cost is reduced.

The present specification is not intended to limit the present invention by the specific terms given. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modifications, alterations, and modifications can be made.

The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are deemed to be included in the scope of the present invention. .

10: EGR flow passage 20: intake flow passage
100: EGR valve 110: first link
120: first pin 200: back pressure valve
210: second link 220: second pin
300: first cam 310: first pin guide hole
311: first guide part 312: second guide part
400: second cam 410: second pin guide hole
411: third guide part 412: fourth guide part
413: fifth guide portion

Claims (7)

A back pressure valve and an EGR valve for controlling the exhaust gas circulation amount are interlocked on a path for recirculating part of the exhaust gas discharged from the combustion chamber of the automobile engine to the intake side,
A first pin guide hole for engaging with a first link interlocking with the EGR valve is formed, the first pin guide hole having a first cam formed to have a first guide portion and a second guide portion; And
And a second pin guide hole is formed to engage with a second link interlocking with the back pressure valve. The second pin guide hole has a second cam formed to have a third guide portion, a fourth guide portion, ≪ / RTI >
Wherein the first cam and the second cam are located on an actuator shaft, the method comprising:
(a) increasing the driving force of the motor;
(b) driving the back pressure valve and the EGR valve interlocked with the cam driven by the driving force; And
(c) measuring an opening time of the back pressure valve and the EGR valve, respectively, and judging that the valve is broken if the time is longer than a predetermined time;
Wherein the EGR valve module is provided with an integrated backpressure valve and an EGR valve module. The method according to claim 1,
The step (c)
(I) driving and stopping the motor until the EGR valve is driven only for detecting the failure of the EGR valve; And
(Ii) measuring a time until the opening of the EGR valve becomes minimum, and determining that the EGR valve is in failure if the time is longer than a predetermined time;
Wherein the EGR valve module is provided with an integrated backpressure valve and an EGR valve module. The method according to claim 1,
The step (c)
(Iii) driving and stopping the motor up to a period in which only the back pressure valve is driven for detecting the failure of the back pressure valve; And
(Iv) measuring a time until the opening degree of the back pressure valve reaches a maximum, and determining that the back pressure valve is faulty if the time is longer than a predetermined time;
Wherein the EGR valve module is provided with an integrated backpressure valve and an EGR valve module. The method according to claim 1,
The step (c)
(A) a setting step of setting a normal operating condition to operating conditions when the EGR valve module is operating normally;
(B) a learning step of measuring and learning the opening time of the back pressure valve and the EGR valve, respectively; And
(C) a step of judging a failure or a normal state of the back pressure valve and the EGR valve;
Wherein the EGR valve module is provided with an integrated backpressure valve and an EGR valve module. 5. The method of claim 4,
The step (b)
The back pressure valve is in a non-rotating state while the first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the third guide portion of the second pin guide hole Further comprising the step of measuring and learning the opening time of the EGR valve, and detecting a failure of the integral type back pressure valve and the EGR valve module. 5. The method of claim 4,
The step (b)
The back pressure valve is rotated while the first pin of the first link moves in the first guide portion of the first pin guide hole and the second pin of the second link moves in the fourth guide portion of the second pin guide hole, Further comprising the step of measuring and learning the opening time of the EGR valve module. 5. The method of claim 4,
The step (b)
The EGR valve is in a non-rotating state while the first pin of the first link moves in the second guide portion of the first pin guide hole and the second pin of the second link moves in the fifth guide portion, Wherein the EGR valve module is mounted on the EGR valve module.

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