KR102000758B1 - Integrated back pressure and egr valve module - Google Patents

Abstract

The present invention discloses an integrated back pressure and an EGR valve module.
The integrated back pressure and EGR valve module according to an embodiment of the present invention includes a back pressure valve disposed in an intake passage that sucks a fresh air from the outside; An EGR valve connected in a diagonal direction forming a predetermined angle to the longitudinal direction of the intake passage and disposed on the LP EGR passage for recirculating the exhaust gas discharged from the engine and passed through the turbine; And a pin guide hole for connecting the EGR valve and the back pressure valve, the pin guide hole being coupled to a pin interlocking with the EGR valve inside the main body, wherein the center of curvature of the pin is opposite to the center, A cam that is fixed to the shaft of the back pressure valve and rotates in a state where the pin engaged with the EGR valve is engaged with the pin guide hole; And the back pressure valve is opened and closed depending on the rotation of the EGR valve.

Description

INTEGRATED BACK PRESSURE AND EGR VALVE MODULE

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated back pressure and an EGR valve module, and more particularly, to an integrated back pressure and EGR valve module in which an INTEGRATED BACK PRESSURE VALVE is opened and closed depending on rotation of 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 view showing an EGR valve unit according to the prior art.

6, the low-pressure EGR apparatus 1 includes a low-pressure EGR regulating valve 4 for adjusting the opening of the low-pressure EGR passage 3 for guiding the EGR gas to the intake passage 2 through which the intake air passes, An intake throttle valve 5 for generating an intake sound pressure at a merging portion of the intake passage 2 and the low pressure EGR passage 3 and an electric actuator 6 for driving the low pressure EGR regulating valve 4, 6 for controlling the operation of the electric actuator 6 and the link device 7 for driving the intake throttle valve 5 by changing the output characteristic of the link control device 6, Pressure EGR valve 4 integrally rotates integrally with the cam plate 12 and the intake throttle valve 5 in which the cam groove 11 is formed so as to be engaged with the cam groove 11 And a follower arm 14 having a follower pin 13 to be fitted thereto.

According to the related art, the conventional LP EGR has a back pressure valve and an EGR valve at the exhaust end, which makes it difficult to control the entire system because the entire system is large and heavy. The back pressure valve exposed to high temperature is intuitive to the durability of the product And the weight of the system is increased.

In addition, a cam structure is adopted for interlocking the EGR valve and the back pressure forming valve. This cam is generally manufactured by using SUS, and since the load is heavy due to its weight during driving, the movement is somewhat heavy, There is a problem that the interlocking between the valves becomes difficult due to the moment of inertia of the valve and its control becomes difficult.

Japanese Laid-Open Patent Publication No. 2016-098719

An embodiment of the present invention is to provide an integrated back pressure and an EGR valve that overcomes the disadvantages of the cam type valve unit to overcome the problems of the related art.

According to an aspect of the present invention, there is provided a back pressure control valve comprising: a back pressure valve disposed in an intake passage for sucking a fresh air from the outside; An EGR valve connected in a diagonal direction forming a predetermined angle to the longitudinal direction of the intake passage and disposed on the LP EGR passage for recirculating the exhaust gas discharged from the engine and passed through the turbine; And a pin guide hole for connecting the EGR valve and the back pressure valve, the pin guide hole being coupled to a pin interlocking with the EGR valve inside the main body, wherein the center of curvature of the pin is opposite to the center, And a cam fixed to the shaft of the back pressure valve in a state in which the pin interlocked with the EGR valve is engaged with the pin guide hole and rotates, and the back pressure valve may be opened / closed depending on the rotation of the EGR valve have.

Wherein the pin guide hole includes: a first pin guide hole for driving only the EGR valve; And a second pin guide hole for synchronously driving the EGR valve and the back pressure valve.

In this structure, the first pin guide hole may be characterized in that the displacement of the back pressure valve is not changed while the pin is moving clockwise or counterclockwise.

Also, the second pin guide hole may be rotated counterclockwise from the open state to the closed state while the pin moves in the counterclockwise direction.

In this case, the pin guide hole may further include a third pin guide hole for synchronizing the back pressure valve and the EGR valve when the EGR valve rotates reversely.

In this structure, the third pin guide hole can rotate clockwise from the open state to the closed state while the pin moves in the clockwise direction.

According to the present invention, the EGR valve, the back pressure valve, and the cam may be formed as an integral three-way valve module.

Preferably, the diameter of the LP EGR passage may be smaller than the diameter of the intake passage.

According to one embodiment of the present invention, the integrated back pressure and the EGR valve module have advantages in that the structure is simple and easy to manufacture, the cost can be reduced, the inertia moment due to the weight reduction of the output gear in the LP EGR section The weight of the product can be reduced and the motor load can be reduced.

Also, since the motor load is reduced, the durability of the motor is increased and quick control is possible. Thus, the durability of the whole product is increased, and the performance demand of the motor required in the past can be lowered, thereby providing a more compact valve module can do.

If necessary, the driving period of the back pressure valve and the EGR valve can be easily changed, and the cam for the reverse rotation and the synchronous driving section can be designed more easily.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an entire schematic diagram of an internal combustion engine for explaining a position where a valve module of the present invention is mounted; FIG.
2 is a view showing a configuration of a valve module according to an embodiment of the present invention.
Figs. 3 to 5 are views showing the opening degree of the EGR valve and the back pressure valve. Fig.
6 is a view showing 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', etc. are used only to distinguish a plurality of configurations, and do not limit the order or other features between configurations.

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 entire schematic diagram 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 installed downstream of the compressor, and an intake throttle for controlling the amount of intake air flowing into the intake manifold is installed.

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 and circulates a part of the exhaust gas to the intake system. Here, the exhaust gas recirculation cooler and the exhaust gas flowing into the EGR passage are controlled An EGR valve is provided. For reference, the DPF (Diesel Particulate Filter) shown in FIG. 1 may be replaced with a catalytic converter, or may be replaced with a GPF when applied to a gasoline vehicle, or in some cases, in combination with a catalytic converter.

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 features of the valve module of the present invention will be described in more detail with reference to Figs. 2 to 5. Fig.

FIG. 2 is a view showing a configuration of a valve module according to an embodiment of the present invention, and FIGS. 3 to 5 show views of opening degrees of the EGR valve and the back pressure valve.

2 and 5 together, the integrated back pressure and EGR valve module includes an EGR valve 100, a back pressure valve 200, and a cam 300 interconnecting the EGR valve 100 and the back pressure valve 200 .

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-type 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 plays a role of regulating the amount of fresh air introduced, but mainly assists in recirculating and mixing the EGR gas. As shown in FIG. 1, a separate throttle valve may be provided at the front end of the back pressure generating valve to adjust the amount of the fresh air introduced.

The cam 300 includes a pin guide hole 310 to which the EGR valve 100 and the back pressure valve 200 are coupled and the pin 110 coupled to the EGR valve 100 is coupled to the inside of the main body of the cam 300, And the pin guide hole 310 may have a curved section divided into at least two sections. Here, the divided curve segments can have centers of different radius of curvature at different points.

Further, with respect to the curved section of the pin guide hole 310, the curvature radius centers of two different sections are opposed to each other and have an inflection point at a relatively intermediate position, and the pin 110 interlocked with the EGR valve 100 is fixed to the pin And the cam is fixed to the shaft of the back pressure valve 200 and rotated.

3, the center of curvature radius on the plane formed by the rotation plane of the cam 300 is the same as the center of the cam 300, And the arc meets the inflection point.

The pin guide hole 310 preferably has a first pin guide hole 311 for driving only the EGR valve 100 and a second pin guide hole 311 for synchronously driving the EGR valve 100 and the back- 312).

Here, the first pin guide hole 311 is a section in which the displacement of the back pressure valve 200 is not changed while the pin 110 moves clockwise or counterclockwise around the driving shaft (the rotational axis of the EGR valve).

The second pin guide hole 312 rotates in a counterclockwise direction from the open state to the closed state while the pin 110 moves in the counterclockwise direction about the drive shaft (the rotational axis of the EGR valve) .

In this cam structure, the pin guide hole 310 according to the embodiment of the present invention is configured such that the EGR valve 100 is rotated in the reverse direction and the EGR valve 100 is in the third pin guide hole 313).

The third pin guide hole 313 is a section in which the back pressure valve 200 rotates clockwise from the open state to the closed state while the pin 110 moves in the clockwise direction.

The back pressure valve 200 according to an embodiment of the present invention is characterized in that it is opened and closed by the EGR valve 100 in a dependent manner. Valve units in which the EGR valve and the back pressure valve according to the prior art are controlled individually have been disclosed, but this increases the cost increase and control complexity. In the present invention, only the structure of the valve module for interlocking the EGR valve 100 and the back pressure valve 200 is proposed.

The EGR valve 100 and the back pressure valve 200 move in conjunction with the cam 300 and the back pressure valve 200 is selectively opened and closed by the rotation of the EGR valve 100 according to the main feature of the present invention.

In this structure, when the pin 110 interlocked with the EGR valve 100 rotates in the clockwise or counterclockwise direction in the first pin guide hole 311, the back pressure valve 200 connected to the cam 300 during this time is rotated I never do that.

When the pin 110 interlocked with the EGR valve 100 rotates counterclockwise in the second pin guide hole 312, the back pressure valve 200 connected to the cam 300 also rotates counterclockwise.

The mechanism will be described in more detail with reference to Figs. 2 to 5. Fig. Here, the configuration of the gear portion is omitted here.

2 to 5, when the pin 110 interlocked with the EGR valve 100 moves in the first pin guide hole 311 and the opening degree of the EGR valve 100 is 0, the intake passage 20 ), Only the shine flows. The initial back pressure valve 200 is opened in a full open state.

When the pin 110 interlocked with the EGR valve 100 moves in the second pin guide hole 312 and the EGR valve 100 is opened at a predetermined opening angle or more, EGR gas is supplied to the intake passage 10 side, The supplied EGR gas is mixed with the incoming gas.

When the pin 110 interlocked with the EGR valve 100 moves in the second pin guide hole 312 and the EGR valve 100 is opened in a counterclockwise direction beyond a predetermined opening angle, The back pressure valve 200 is pulled out to rotate in the counterclockwise direction in the same manner as the EGR valve 100. At this time, on the contact side of the intake passage 20 and the EGR passage 10, the intake air flow rate is increased by closing the valve, and mixing of the intake air and the EGR gas becomes active.

In addition, when the EGR valve 100 is opened at the maximum opening angle in the second pin guide hole 312, the cam 300 is interlocked with the back pressure valve 200 The back pressure valve 200 is fully closed and only the EGR gas is supplied to the downstream of the intake flow passage 10. 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 pin 110 interlocked with the EGR valve 100 is opened in the clockwise direction in the third pin guide hole 313, the back pressure valve 200 rotates counterclockwise from the open state to the closed state. When the EGR valve 100 rotates in a reverse direction beyond the position where the EGR valve 100 is closed after the engine is stopped or stopped, contaminants in the exhaust gas on the EGR valve 100 side can be removed.

According to an embodiment of the present invention, the EGR passage 10 may be connected to the longitudinal direction of the intake passage 20 in a diagonal direction at a predetermined angle. If the EGR passage 10 is connected to the intake passage 20 at a right angle other than diagonal directions, foreign matter such as nitrogen oxides may accumulate in the back-pressure valve 200 located in the intake passage 20, causing valve failure. Therefore, the EGR passage 10 is connected to the intake passage 20 in a diagonal direction to prevent this.

Also, the first valve 100, the back pressure valve 200, and the cam 300 may be formed as an integrated 3-way valve module.

In another embodiment of the present invention, the diameter of the EGR passage 10 is smaller than the diameter of the intake passage 20. That is, when the cross-sectional area of the LP EGR passage is compared with the sectional area of the intake passage 20, the cross-sectional area of the LP EGR passage is previously designed small so that only the EGR valve 100 is opened. When the back-pressure valve 200 is closed, Can be made small.

2 to 5, compared with the prior art of FIG. 6, the present invention corresponds to an INVERSE CAM structure for the valve structure of the prior art of FIG. The inverse cam means the opposite of the role of the prism and the descendant. In this specification, the cam which plays the role of the prism in the case of the prior art can mean that the present invention plays a role of the descendant.

In the prior art, if a follower arm 14 for connecting the back-pressure valve to the EGR valve is essentially provided, the present invention can omit a follower arm for connecting the back-pressure valve and the EGR valve, The same function can be performed.

6, the cam is located on the drive shaft (on the EGR valve side) where the motor and the gear unit are provided, so that it is difficult to control by the inertial load of the cam, The cam is located on the slave axis (the back pressure valve side) rather than on the drive shaft, so that the inertia load is less than that of the prior art during the valve opening / closing operation. 6, if the entire cam needs to be rotated in the prior art shown in FIG. 6, only the portion including the pin in the EGR valve needs to be rotated, so that the load applied to the motor is relatively reduced will be.

The integrated backpressure and EGR valve module according to the present invention can reduce the inertia moment due to the weight reduction of the output gear in the LP EGR section, Thereby reducing the weight of the product and reducing the motor load.

Also, since the motor load is reduced, the durability of the motor is increased and quick control is possible. Thus, the durability of the whole product is increased, and the performance demand of the motor required in the past can be lowered, thereby providing a more compact valve module can do.

If necessary, the driving period of the back pressure valve and the EGR valve can be easily changed, and the cam for the reverse rotation and the synchronous driving section can be designed more easily.

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: Pin
200: back pressure valve 300: cam
310: pin guide hole 311: first pin guide hole
312: second pin guide hole 313: third pin guide hole

Claims (8)

A back pressure valve disposed in the intake passage for drawing a fresh air from the outside;
An EGR valve connected in a diagonal direction forming a predetermined angle to the longitudinal direction of the intake passage and disposed on the LP EGR passage for recirculating the exhaust gas discharged from the engine and passed through the turbine; And
Wherein a pin guide hole is formed to connect the EGR valve and the back pressure valve together with a pin interlocking with the EGR valve inside the main body, wherein the center of curvature of the pin guide hole has a center A cam which is fixed to a shaft of a back pressure valve which is a driven shaft and which is engaged with a pin guide hole and which rotates with an EGR valve located on the drive shaft and rotates;
/ RTI >
Wherein the back pressure valve is opened and closed depending on the rotation of the EGR valve. The method according to claim 1,
The pin guide hole
A first pin guide hole for driving only the EGR valve; And
A second pin guide hole for synchronously driving the EGR valve and the back pressure valve;
Wherein the EGR valve module includes: 3. The method of claim 2,
Wherein the first pin guide hole does not change the displacement of the back pressure valve while the pin is moving clockwise or counterclockwise. 3. The method of claim 2,
Wherein the second pin guide hole rotates in a counterclockwise direction from a closed state to a closed state when the pin moves in the counterclockwise direction. 3. The method of claim 2,
Wherein the pin guide hole further comprises a third pin guide hole for synchronizing the back pressure valve and the EGR valve when the EGR valve is reversely rotated. 6. The method of claim 5,
Wherein the third pin guide hole rotates in a clockwise direction from the open state to the closed state while the pin moves in the clockwise direction. The method according to claim 1,
Wherein the EGR valve, the back pressure valve and the cam are formed as an integral three-way valve module. The method according to claim 1,
Wherein the diameter of the LP EGR passage is smaller than the diameter of the intake passage.

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