KR100844565B1 - Ｖ8 type diesel engine exhaust gas recirculation system - Google Patents

Abstract

According to the present invention, the EGR valve and the EGR cooler are integrally installed and mounted on the V8 diesel engine, thereby improving the mountability and reducing the overall weight of the engine, thereby reducing the cost and improving the performance thereof. Provided is an exhaust gas recirculation device for a V8 diesel engine.

Description

EXHAUST GAS RECIRCULATION SYSTEM FOR V8 TYPE DIESEL ENGINE}

1 is a conceptual diagram of a conventional exhaust gas recirculation apparatus for a V8 diesel engine.

2 is a perspective view of an exhaust gas recirculation apparatus for a V8 diesel engine according to an exemplary embodiment of the present invention.

3 is a perspective view of an EGR cooler unit according to an embodiment of the present invention.

4 is a perspective view of an EGR valve housing according to an embodiment of the present invention.

5 is a cross-sectional view of an exhaust gas recirculation apparatus for a V8 diesel engine according to an exemplary embodiment of the present invention.

The present invention relates to an exhaust gas recirculation device for an V8 diesel engine (EGR: Exhaust Gas Recirculation; hereinafter referred to as an EGR device), and more particularly, an EGR valve and an EGR mounted on a V-type eight-cylinder twin turbocharged diesel engine. By integrally configuring the cooler, the present invention relates to an exhaust gas recirculation apparatus for a V8 diesel engine that can improve assembly performance with the engine and reduce the overall weight of the engine, thereby reducing the cost and improving its performance.

In general, an automotive diesel engine injects and compresses only air into a cylinder, and when the temperature of the air becomes high, the high-pressure injection of fuel into the atomized particles causes the injection fuel to self-ignite and burn by the heat of compressed air.

The diesel engine is composed of an engine body having a piston and a crankshaft, and a lubrication device, a cooling device, a fuel device, an intake and exhaust device, an electric device, and the like, and in particular, instead of the electric ignition device used in a gasoline engine. A fuel injection device is used.

In such a diesel engine, the air is always excessively supplied in accordance with the engine speed, and in particular, a large amount of nitrogen oxide is discharged because the excess air ratio is large at the low load side.

As such, diesel engines typically use an EGR device to reduce the amount of nitrogen oxides contained in the exhaust gas after combustion, which does not change the mixer's own air-fuel ratio by sending the exhaust gas back to the intake air and flowing it back into the combustion chamber. Without lowering the density of the mixer to lower the combustion temperature.

That is, when it is necessary to reduce the amount of nitrogen oxides according to the operating state of the engine, the EGR apparatus provides a part of the exhaust gas to the intake side through the EGR valve and flows it back into the combustion chamber.

Then, since the exhaust gas introduced into the combustion chamber is an inert gas and the volume of the intake gas does not change, the density of the mixer is relatively lowered, thereby lowering the propagation speed and the combustion speed of the flame. The generation of oxides is suppressed.

FIG. 1 is a view showing an embodiment of such a conventional EGR device. The conventional EGR device for a V8 diesel engine includes a throttle valve 5 respectively provided to the left and right cylinder heads 1 and 3 in an engine room. It is comprised between the edge part of the intake pipe 7 and the exhaust manifold 9 comprised.

That is, the both EGR devices are connected to the suction end of each EGR cooler 13 for branching the bypass pipe 11 from one end of each exhaust manifold 9 to cool the exhaust gas sucked by using the engine coolant. The outlet end of each of the EGR coolers 13 is connected to one side of each intake pipe 7 through each EGR pipe 15.

Each of the EGR pipes 15 is provided with an EGR valve 17 for selectively opening and closing the EGR pipe 15 in accordance with the operating conditions of the engine.

Here, each of the EGR valve 17 is electrically connected to an ECU (not shown) for determining the opening and closing time, the ECU is connected to a water temperature sensor, an engine speed sensor, a throttle valve opening sensor, not shown The opening / closing time of each of the EGR valves 17 is determined and the control signal is output.

In the operation of the above-described EGR device, a part of the EGR device is introduced into the bypass pipe 13 while the exhaust gas combusted by the operation of each cylinder combustion chamber is discharged through the exhaust manifold 9.

At this time, the EGR valve 17 located on the EGR pipe 13 controls the opening of the EGR pipe 15 according to the control signal of the ECU.

The control of the opening of the EGR valve 17 is performed by comparing the preset value with the preset value by the ECU, which has received the detected values such as the water temperature sensor, the engine speed sensor, the throttle valve open sensor, and the like. If judged to be large, an electrical signal is sent to the EGR valve 17 to open the EGR pipe 15, whereby the exhaust gas containing a large amount of unburned oxygen is recycled into the intake pipe 7.

On the contrary, when the ECU judges that the unburned oxygen content of the exhaust gas is minute, the EGR valve 17 is closed-controlled so that all the exhaust gas is discharged through the exhaust manifold 9.

However, since the conventional EGR device for a V8 diesel engine as described above must be mounted as an independent individual part between the left and right cylinder heads, the mounting space is inferior due to the narrow space, and there is a problem that the workability is inferior even when the parts are replaced later. In other words, the engine has problems such as an increase in the overall weight of the engine and a cost increase.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to integrate the EGR valve and the EGR cooler integrally and install it in a V8 diesel engine, thereby improving its mountability and the engine. It is to provide an exhaust gas recirculation device for a V8 diesel engine that can reduce the overall weight of the fuel, thereby reducing the cost and improve its performance.

Exhaust gas recirculation apparatus for a V8 diesel engine according to the present invention for achieving the above object is mounted between the left and right cylinder head of the V8 diesel engine, and after combustion, unburned exhaust gas discharged to each exhaust manifold. An exhaust gas recirculation apparatus for a V8 type diesel engine that cools a part of exhaust gas through each of the two EGR passages and reduces the exhaust gas to each intake pipe side, comprising: a cooler unit for cooling the exhaust gas introduced through the both EGR passages; It is integrally mounted to the front of the cooler unit, the inside is formed in a hollow to form a gas passage chamber, the upper center is formed with two cylindrical valve mounting holes connected to the gas passage chamber, the bottom of the front center each of the valves A valve housing having two exhaust ports connected to the mounting holes; And an EGR valve mounted to each valve mounting hole to open and close the gas passage chamber and each exhaust port.

The cooler unit,

The front, the rear is opened, the inside thereof is formed in a hollow, a first cooling water inlet is formed in one front corner, a second coolant inlet is formed in one corner of the lower surface adjacent to the first coolant inlet, A cooler housing having a first coolant outlet formed at a rear one side edge corresponding to the first coolant inlet, and having a second coolant outlet formed at a corner of an upper surface of the first coolant outlet adjacent to the first coolant outlet; A rear cover formed at a rear end of the cooler housing so as to correspond to a rear of the cooler housing, forming a gas chamber partitioned left and right through a partition wall therein; Mounted on the inner hollow portion of the cooler housing, a plurality of cooling tubes formed by passing through the exhaust gas passage in the longitudinal direction in the transverse direction is laminated at a predetermined interval, the cooling water passage through which the cooling water is passed between each cooling tube Cooling tube block formed; A connecting block integrally formed by forming an inlet and a mounting hole at both ends of the rear cover, respectively; And one end is mounted to the mounting hole of the connection block in a state arranged side by side along the side of the cooler housing, the other end is characterized in that consisting of inlet pipes which are respectively mounted to both ends of the valve housing to be connected to the gas passage chamber.

The cooling tube block is formed by blocking the front end of the cooling water on the cooling water passage to the gas passage chamber of the valve housing, and the rear end of the cooling tube block is formed to block the cooling water on the cooling water passage to each gas chamber of the rear cover. It is done.

The valve housing partition wall is formed in the inner center to partition the gas passage chamber to the left and right, and each of the partitioned left and right gas passage chambers, the secondary partition wall is formed with an exhaust gas passage hole in the upper one side, respectively It is characterized by being formed.

The valve housing is characterized in that the coolant hole is formed at a position corresponding to the first coolant inlet.

The cooler housing is characterized in that the front one side corner portion and the other rear corner portion corresponding to the diagonal direction protrudes in the horizontal direction to form a left, right cooling water chamber, respectively.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail as follows.

2 is a perspective view of a V8 type diesel engine exhaust gas recirculation apparatus according to an embodiment of the present invention, Figures 3 and 4 are a perspective view of the cooler unit and the valve housing according to an embodiment of the present invention, Figure 5 is a present invention A cross-sectional view of an exhaust gas recirculation apparatus for a V8 diesel engine according to an embodiment of the present invention.

As shown in FIG. 2, the V8 type diesel engine exhaust gas recirculation apparatus according to the embodiment of the present invention includes a cooler unit 100, a valve housing 200, and an EGR valve 300.

First, as shown in FIGS. 3 and 5, the cooler unit 100 includes a cooler housing 110, a rear cover 120, a cooling tube block 130, a connection block 140, and an inlet pipe ( 150).

The cooler housing 110 has a front and a rear opening, a hollow inside thereof, a first coolant inlet 111 is formed at one front corner, and a lower portion adjacent to the first coolant inlet 111. The second coolant inlet 113 is formed at one edge of the surface.

In addition, a first coolant outlet 115 is formed at a rear one side corner corresponding to the first coolant inlet 111, and a second coolant outlet (1) is formed at a corner of an upper surface adjacent to the first coolant outlet 115. 117 is formed.

Here, the cooler housing 110 has a front one side corner portion and the other rear corner portion corresponding to the diagonal direction protrudes in the horizontal direction to form a left, right coolant chamber 118, 119, respectively, the first, It is preferable that the second coolant inlets 111 and 113 and the first and second coolant outlets 115 and 117 are connected thereto, respectively.

The rear cover 120 is mounted to the rear end of the cooler housing 110.

The rear cover 120 is formed to correspond to the rear of the cooler housing 110, the gas chambers 123 and 125 are partitioned to the left and right sides through the partition wall 121.

The cooling tube block 130 is mounted to an inner hollow portion of the cooler housing 110.

The cooling tube block 130 has a plurality of cooling tubes 133 formed by passing through the exhaust gas passage 131 in the transverse direction in the transverse direction are stacked at a predetermined interval, and the cooling water between the cooling tubes 133 Cooling water passage 135 through which is formed is formed.

In addition, the connection block 140 is integrally formed by forming an inlet 141 and a mounting hole 142 at both ends of the rear cover 120, respectively.

The inlet pipe 150 has one end mounted to the mounting hole 142 of the connection block 140 in a state arranged side by side along the side of the cooler housing 110, the other end of both ends of the valve housing 200 Are mounted on each.

The valve housing 200 is integrally mounted to the front of the cooler unit 100 configured as described above.

As shown in FIGS. 4 and 5, the valve housing 200 has a hollow interior, and a gas passage chamber 201 is formed therein, and the valve housing 200 is connected to the gas passage chamber 201 at an upper center thereof. Cylindrical valve mounting holes 203 are formed, and two exhaust ports 205 connected to the valve mounting holes 203 are formed at the lower front center.

Here, the gas passage chamber 201 is connected to the other ends of the inlet pipe 150 respectively mounted on both ends of the valve housing 200.

In addition, the valve housing 200 has a partition wall 207 formed at an inner center thereof to partition the gas passage chamber 201 to the left and right sides, and to partition the gas passage chamber 201 to the left and right gas passage chambers 209 and 211. In each center, an auxiliary barrier rib 215 having an exhaust gas passage hole 213 formed on one side thereof is formed.

In addition, the valve housing 200 preferably has a coolant hole 217 formed at a position corresponding to the first coolant inlet 111.

Here, the cooling tube block 130 is formed by blocking the front end of the cooling tube on the cooling water passage 135 to the gas passage chamber 201 of the valve housing 200 so as not to flow out, and each of the rear cover 120 It is preferable that the rear end of the gas chambers 123 and 125 is blocked so that the coolant on the coolant passage 135 does not flow out.

The EGR valve 300 is mounted in the valve mounting holes 203, respectively, to open and close the gas passage chamber 201 and the exhaust ports 205.

In the exhaust gas recirculation apparatus for the V8 diesel engine configured as described above, as shown in FIG. 2, the valve housing 200 is mounted to the front end of the cooler unit 100 through an assembly bolt. The EGR valve 300 is mounted in the valve mounting hole 203, respectively.

The exhaust gas recirculation apparatus for the V8 diesel engine is disposed between the left and right cylinders of the V8 diesel engine, and each bypass pipe branched from one end of the left and right exhaust manifolds to each of the intake ports 141. Each exhaust port 205 of the valve housing 200 is connected to an EGR tube and connected to an intake manifold through the EGR tube.

In addition, a coolant supply line is connected to the first and second coolant inlets 111 and 113 so that the cooler unit 100 is supplied with coolant from a coolant pump (not shown), and the supplied coolant is connected to each coolant passage ( 135, the used coolant is discharged through the coolant discharge line connected to the first and second coolant outlets 115 and 117.

On the other hand, each of the EGR valve 300 is electrically connected to an ECU (not shown) for determining the opening and closing time, the ECU is a water temperature sensor, an engine speed sensor, a throttle valve opening detection sensor and the like not shown It is connected to determine the opening and closing time of each of the EGR valve 300 to output the control signal.

The operation of the exhaust gas recirculation apparatus for the V8 diesel engine is performed in the process of exhaust gas exhausted by the operation of the internal combustion chambers of the left and right cylinders of the V8 diesel engine through the left and right exhaust manifolds. It flows into each bypass pipe.

Here, the introduced exhaust gas enters the left and right gas passage chambers 209 and 211 of the valve housing 200 through the respective inlet pipes 150 through the respective inlet ports 141, and each of the gas passages. Through each exhaust gas passage 131 of the cooling tube block 130 connected to the rear by the auxiliary partition 215 of the seals 209 and 211 from the front to the rear, to each of the cooling water passage 135 The exhaust gas is cooled by the introduced cooling water.

The cooled exhaust gas passes through the exhaust gas passages 131 forward and backward through the left and right gas chambers 121 and 123 of the rear cover 120, and the left and right gas passage chambers 209. 211 is discharged through each of the outlets 205 according to the opening and closing of the EGR valve 300 through the exhaust gas passage hole 213 of the auxiliary partition 215, each outlet 205 Cooled exhaust gas containing a large amount of unburned oxygen flows into the left and right intake manifolds through the EGR pipe connected to

That is, a part of the exhaust gas discharged through the left and right exhaust manifolds is passed through the bypass pipe to the inside of the cooler unit 100 through which the coolant is circulated, thereby cooling the introduced exhaust gas, and the electrical signal of the ECU. By supplying back to the intake manifold through each of the EGR pipes by the control of the opening and closing of the EGR valve 300, the unburned exhaust gas is recycled.

When the exhaust gas recirculation device for the V8 diesel engine according to the present embodiment is applied, the cooler unit 100, the valve housing 200, and the EGR valve 300 are integrally formed to form the left and right cylinders of the V8 diesel engine. By mounting in between, the mountability can be improved and the overall weight of the engine can be reduced.

As described above, according to the exhaust gas recirculation apparatus for the V8 diesel engine according to the present invention, the cooler and the EGR valve are integrally formed with the EGR unit, which is mounted as an independent individual part between the left and right cylinder heads of the V8 diesel engine. By attaching, the mounting property is improved and workability is improved also in the case of replacement of parts later.

In addition, by mounting the exhaust gas recirculation device for the integrated V8 diesel engine has the effect of reducing the overall weight of the engine, thereby reducing the cost and its performance.

Claims (6)

It is installed between the left and right cylinder heads of the V8 diesel engine, and after combustion, a part of the exhaust gas is cooled through the EGR passages on both sides according to the amount of unburned oxygen of the exhaust gas discharged to each exhaust manifold and reduced to each intake pipe side. In the exhaust gas recirculation apparatus for a V8 diesel engine to be A cooler unit for cooling the exhaust gas flowing through the both side EGR passages; It is integrally mounted to the front of the cooler unit, the inside is formed in a hollow to form a gas passage chamber, the upper center is formed with two cylindrical valve mounting holes connected to the gas passage chamber, the bottom of the front center each of the valves A valve housing having two exhaust ports connected to the mounting holes; And an EGR valve mounted to each of the valve mounting holes to open and close the gas passage chamber and each exhaust port. The method of claim 1, The cooler unit, The front, the rear is opened, the inside thereof is formed in a hollow, the first cooling water inlet is formed in one front corner, the second coolant inlet is formed in one corner of the lower surface adjacent to the first cooling water inlet A cooler housing having a first coolant outlet formed at a rear one side edge corresponding to the first coolant inlet, and having a second coolant outlet formed at a corner of an upper surface of the first coolant outlet adjacent to the first coolant outlet; A rear cover formed at a rear end of the cooler housing so as to correspond to a rear of the cooler housing, forming a gas chamber partitioned left and right through a partition wall therein; Mounted on the inner hollow portion of the cooler housing, a plurality of cooling tubes formed by passing through the exhaust gas passage in the longitudinal direction in the transverse direction is laminated at a predetermined interval, the cooling water passage through which the cooling water is passed between each cooling tube Cooling tube block formed; A connection block integrally formed by forming an inlet and a mounting hole at both ends of the rear cover, respectively; One end is mounted to the mounting hole of the connection block in a state arranged side by side along the side of the cooler housing, the other end is made of inlet pipes which are respectively mounted to both ends of the valve housing to be connected to the gas passage chamber Exhaust gas recirculation system for diesel engines. The method of claim 2, The cooling tube block is formed by blocking a front end of the cooling tube on the cooling water passage so that the cooling passage on the cooling water passage does not flow into the gas passage chamber of the valve housing, and a rear end of the cooling tube block is formed so that the cooling water on the cooling water passage does not flow into the gas chamber of the rear cover. Exhaust gas recirculation system for V8 diesel engines The method of claim 1, The valve housing partition wall is formed in the inner center to partition the gas passage chamber to the left and right, and each of the partitioned left and right gas passage chambers, the secondary partition wall is formed with an exhaust gas passage hole in the upper one side, respectively Exhaust gas recirculation apparatus for a V8 diesel engine, characterized in that formed. The method of claim 2, The valve housing is an exhaust gas recirculation device for a V8 diesel engine, characterized in that the cooling water hole is formed in a position corresponding to the first cooling water inlet. The method of claim 2, The cooler housing is a V8 type diesel engine exhaust gas recirculation apparatus, characterized in that the front one side corner portion and the other rear corner portion corresponding to the diagonal direction is formed protruding in the horizontal direction, respectively, the left and right cooling water chamber is formed.

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