JP2013189894A - Multicylinder engine with exhaust gas processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multicylinder engine with an exhaust gas processing device capable of simplifying a structure of the exhaust gas processing device.SOLUTION: For solving this problem, in a multicylinder engine with an exhaust gas processing device installing an exhaust manifold 2 on the lateral one side of a cylinder head 1, arranging the exhaust gas processing device 3 turned in the longitudinal direction above the exhaust manifold 2 and installing this exhaust gas processing device 3 in an engine body 5 by a stay 4, a confluent exhaust outlet 6 is arranged in the central part in the longitudinal direction of the exhaust manifold 2, and when arranging an exhaust inlet case 7 on one end side in the longitudinal direction of the exhaust gas processing device 3, a supercharger 8 is installed in an upper part of the confluent exhaust outlet 6 of the exhaust manifold 2, an exhaust deriving pipe 10 is derived toward the exhaust inlet case 7 of the exhaust gas processing device 3 from an exhaust turbine 9 of the supercharger 8, and the confluent exhaust outlet 6 of the exhaust manifold 2 and the exhaust inlet case 7 of the exhaust gas processing device 3 are communicated via the supercharger 8 and the exhaust deriving pipe 10.

Description

  The present invention relates to a multi-cylinder engine with an exhaust treatment device, and more particularly, to a multi-cylinder engine with an exhaust treatment device that can simplify the structure of the exhaust treatment device.

Conventionally, as a multi-cylinder engine with an exhaust treatment device, an exhaust manifold is attached to one side of the cylinder head, and an exhaust treatment device facing in the front-rear direction is arranged above the exhaust manifold, and this exhaust treatment device is attached to the engine body with a stay. Some are attached (see, for example, Patent Document 1).
According to this type of multi-cylinder engine with an exhaust treatment device, the exhaust treatment device can be mounted on the machine integrally with the engine main body, so that there is an advantage that the exhaust treatment device can be easily mounted on the machine.
However, in this prior art, when providing a combined exhaust outlet at the central portion in the front-rear direction of the exhaust manifold and providing an exhaust inlet case at one end in the front-rear direction of the exhaust treatment device, an exhaust introduction passage along the front-rear direction is integrated with the exhaust treatment device. There is a problem because the combined exhaust outlet of the exhaust manifold and the exhaust inlet case of the exhaust treatment device are communicated with each other through the exhaust introduction passage.

JP 2010-71177 A (see FIG. 15)

<Problem> The structure of the exhaust treatment device becomes complicated.
Since an exhaust introduction passage along the front-rear direction is formed integrally with the exhaust treatment device, the structure of the exhaust treatment device becomes complicated. For this reason, it becomes difficult to manufacture the exhaust treatment device.

  An object of the present invention is to provide that the structure of an exhaust treatment device can be simplified.

Invention specific matters of the invention according to claim 1 are as follows.
As shown in FIGS. 1 to 3, an exhaust manifold (2) is attached to one side of the cylinder head (1), and an exhaust treatment device (3) oriented in the front-rear direction is disposed above the exhaust manifold (2). In the multi-cylinder engine with the exhaust treatment device, the exhaust treatment device (3) is attached to the engine body (5) with the stay (4).
As shown in FIGS. 1 to 3, a combined exhaust outlet (6) is provided at the center in the front-rear direction of the exhaust manifold (2), and an exhaust inlet case (7) is provided at one end in the front-rear direction of the exhaust treatment device (3). In setting up
As shown in FIGS. 1 to 3, a supercharger (8) is attached to the upper part of the combined exhaust outlet (6) of the exhaust manifold (2), and exhaust processing is performed from the exhaust turbine (9) of the supercharger (8). The exhaust outlet pipe (10) is led out toward the exhaust inlet case (7) of the device (3), and the combined exhaust outlet of the exhaust manifold (2) is connected via the supercharger (8) and the exhaust outlet pipe (10). A multi-cylinder engine with an exhaust treatment device, characterized in that (6) communicates with an exhaust inlet case (7) of the exhaust treatment device (3).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> The structure of the exhaust treatment device can be simplified.
As shown in FIGS. 1 to 3, a supercharger (8) is attached to the upper part of the combined exhaust outlet (6) of the exhaust manifold (2), and exhaust processing is performed from the exhaust turbine (9) of the supercharger (8). The exhaust outlet pipe (10) is led out toward the exhaust inlet case (7) of the device (3), and the combined exhaust outlet of the exhaust manifold (2) is connected via the supercharger (8) and the exhaust outlet pipe (10). Since (6) and the exhaust inlet case (7) of the exhaust treatment device (3) are communicated with each other, there is no need to integrally form an exhaust introduction passage in the exhaust treatment device (3), and the structure of the exhaust treatment device (3) Can be simplified. For this reason, manufacture of the exhaust treatment device (3) is facilitated.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Deformation of the exhaust treatment device can be prevented.
As illustrated in FIGS. 1 to 3, the exhaust inlet case (7) of the exhaust treatment device (3) is supported on the exhaust outlet pipe (10), and the exhaust outlet case (13) side of the exhaust treatment device (3). Is connected to the exhaust outlet pipe (10) by the stay (4), so that the vibration of the exhaust turbine (9) is caused by the exhaust inlet pipe (10) and the stay (4) through the exhaust inlet case (7). Therefore, the vibrations of the exhaust inlet case (7) and the exhaust outlet case (13) are easily synchronized. For this reason, the deformation | transformation of the exhaust-gas treatment apparatus (3) which arises by the mismatch of the vibration of the part by the side of the exhaust inlet case (7) and the exhaust outlet case (13) can be prevented.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 2.
<Effect> The exhaust treatment device is firmly supported by the engine body.
1-3, one end of the stay (4) is attached to the outlet end flange (11) of the exhaust outlet pipe (10), and the other end of the stay (4) is connected to the cylinder. Since it was attached to the cooling water outlet flange (15) of the thermostat case (14) attached to the head (1), the exhaust treatment device (3) is firmly supported by the engine body (5) via the stay (4). The

It is the principal part perspective view which looked at the diesel engine with an exhaust treatment device which concerns on embodiment of this invention from the back slanting of the exhaust side. It is the principal part side view which looked at the engine of FIG. 1 from the exhaust side. FIG. 2 is a side view of the upper half of the engine when the engine of FIG. 1 is viewed from the exhaust side. It is the principal part side view which looked at the engine of FIG. 1 from the intake side.

1 to 4 are diagrams for explaining a multi-cylinder engine with an exhaust treatment device according to an embodiment of the present invention. In this embodiment, a multi-cylinder diesel engine with an exhaust treatment device will be explained.
This engine is a vertical water-cooled in-line four-cylinder diesel engine with a DPF exhaust treatment device.
As shown in FIG. 3, the cylinder head (1) is assembled to the upper part of the cylinder block (16), and the head cover (17) is assembled to the upper part of the cylinder head (1).
An engine cooling fan (18) is disposed at the front of the cylinder head (1), and a flywheel housing (19) is disposed at the rear of the cylinder block (16).

  As shown in FIG. 3, an exhaust manifold (2) is attached to one side of the cylinder head (1), and an exhaust treatment device (3) directed in the front-rear direction is disposed above the exhaust manifold (2). The processing device (3) is attached to the engine body (5) with a stay (4).

As shown in FIGS. 1 to 3, a combined exhaust outlet (6) is provided at the center in the front-rear direction of the exhaust manifold (2), and an exhaust inlet case ( 7) is provided as follows.
As shown in FIGS. 1 to 3, a supercharger (8) is attached to the upper part of the combined exhaust outlet (6) of the exhaust manifold (2), and an exhaust treatment device is installed from the exhaust turbine (9) of the supercharger (8). The exhaust outlet pipe (10) is led out toward the exhaust inlet case (7) of (3), and the combined exhaust outlet (2) of the exhaust manifold (2) is connected via the supercharger (8) and the exhaust outlet pipe (10). 6) communicates with the exhaust inlet case (7) of the exhaust treatment device (3).
The exhaust lead-out pipe (10) is led out from the rear end of the exhaust turbine (9) in the horizontal oblique direction on the head cover (17) side.
The supercharger (8) includes a rear exhaust turbine (9) and a front compressor (37). An intake duct (39) is connected to an intake inlet (38) of the compressor (37), and the compressor ( The intake manifold (42) of FIG. 4 is communicated with the compressed air outlet (40) of 37) via a supercharged pipe (41).

As shown in FIGS. 1 to 3, a lead-out end flange (11) is provided at the lead-out end portion of the exhaust lead-out pipe (10), and the lead-out end flange (11) has an inlet flange (12) of the exhaust inlet case (7). The exhaust inlet case (7) of the exhaust treatment device (3) is supported by the exhaust outlet pipe (10), and the exhaust outlet is disposed at the other front side in the front-rear direction (front side) of the exhaust treatment device (3). A case (13) is provided, the stay (4) is connected to the exhaust treatment device (3) on the exhaust outlet case (13) side, and the stay (4) is connected to the outlet end flange (11) of the exhaust outlet pipe (10). ) Is mounted and attached, the portion on the exhaust outlet case (13) side of the exhaust treatment device (3) is connected to the exhaust outlet pipe (10) by the stay (4).
The lead-out end flange (11) is in a horizontal posture.

As shown in FIGS. 1 to 3, one end (rear end) of the stay (4) is attached to the outlet end flange (11) of the exhaust outlet pipe (10) and the other end of the stay (4). The part (front end) is attached to the cooling water outlet flange (15) of the thermostat case (14) attached to the cylinder head (1).
The thermostat case (14) is disposed at the front end of the cylinder head (1).

As shown in FIGS. 1 to 3, an inlet pipe (20) is led out radially outward from the peripheral wall of the exhaust inlet case (7), and an inlet flange (12) is connected to the leading end of the inlet pipe (20). Provided. A DOC (21) is accommodated in the exhaust inlet case (7).
A DPF storage case (22) is disposed between the exhaust inlet case (7) and the exhaust outlet case (13), and the DPF (23) is stored in the DPF storage case (22).
An outlet pipe (24) is led out radially outward from the peripheral wall of the exhaust outlet case (13), and an outlet flange (25) is provided at the outlet end of the outlet pipe (24).
An inlet flange (27) of the exhaust duct (26) is connected to the outlet flange (25).
DOC is an abbreviation for diesel oxidation catalyst, and DPF is an abbreviation for diesel particulate filter. The DPF (23) captures PM (particulate matter) contained in the exhaust and purifies the exhaust.
The exhaust inlet case (7) and the exhaust outlet case (13) are connected to the DPF housing case (7) by case connecting portions (28) and (29).

The stay (4) includes a horizontal substrate (30), a rear end side upright plate (31) provided near the rear end of the horizontal substrate (30), and a front end side upright provided at the front end of the horizontal substrate (30). Plate (32), the rear end portion of the horizontal substrate (30) is mounted on the outlet end flange (11) of the exhaust outlet pipe (10), and the front end portion of the horizontal substrate (30) is cooled. It is mounted on the outlet flange (15). Further, the front end portion of the horizontal substrate (30) is reinforced by a reinforcing stay (33) attached to the cylinder head (1).
Then, the mounting piece (28a) of the rear case connecting portion (28) is attached to the rear end side upright plate (31), and the mounting piece (29a) of the front case connecting portion (29) is attached to the front end side upright plate (32). ) Is installed.

As shown in FIGS. 1 to 3, the exhaust treatment device (3) includes a differential pressure sensor (34) for detecting a differential pressure between the upstream side and the downstream side of the DPF (23), and an upstream side of the DPF (23). As shown in FIG. 4, a DPF upstream temperature sensor (35) for detecting the exhaust gas temperature and a DOC upstream temperature sensor (36) for detecting the exhaust gas temperature upstream of the DOC (2) are provided.
The differential pressure sensor (35), the DPF upstream temperature sensor (35), and the DOC upstream temperature sensor (36) are linked to a common rail fuel injection device (not shown) via an engine ECU (not shown). Yes.

In this exhaust treatment device, the engine ECU is experimentally used by using the differential pressure detected by the differential pressure sensor (34), the DPF upstream exhaust temperature detected by the DPF upstream temperature sensor (35), the fuel injection amount, and the like. Based on the obtained PM accumulation amount estimation map, the PM accumulation amount of the DPF (23) is estimated, and when the PM accumulation amount reaches a predetermined regeneration required value, the engine ECU is exhausting by post injection after the main injection. Is supplied with unburned fuel, and the unburned fuel is catalytically combusted with DOC (21) by oxygen in the exhaust, the exhaust temperature is raised, and PM deposited on the DPF (23) is incinerated and removed by the heat of the exhaust. The DPF (23) is regenerated.
If the DOC upstream exhaust temperature measured by the DOC upstream temperature sensor (36) is lower than the activation temperature of the DOC (21), the engine ECU stops the post injection.

(1) Cylinder head
(2) Exhaust manifold
(3) Exhaust treatment equipment
(4) Stay
(5) Engine body
(6) Merged exhaust outlet
(7) Exhaust inlet case
(8) Turbocharger
(9) Exhaust turbine
(10) Exhaust outlet pipe
(11) Outlet flange
(12) Inlet flange
(13) Exhaust outlet case
(14) Thermostat case
(15) Cooling water outlet flange

Claims (3)

An exhaust manifold (2) is attached to one side of the cylinder head (1), an exhaust treatment device (3) is disposed above the exhaust manifold (2) in the front-rear direction, and the exhaust treatment device (3) is attached to the stay. In the multi-cylinder engine with an exhaust treatment device attached to the engine body (5) in (4),
In providing the combined exhaust outlet (6) at the center of the exhaust manifold (2) in the front-rear direction and the exhaust inlet case (7) at one end in the front-rear direction of the exhaust treatment device (3),
The supercharger (8) is attached to the upper part of the combined exhaust outlet (6) of the exhaust manifold (2), and the exhaust inlet case (7) of the exhaust treatment device (3) is connected from the exhaust turbine (9) of the supercharger (8). The exhaust outlet pipe (10) is led out toward the exhaust pipe, and the combined exhaust outlet (6) of the exhaust manifold (2) and the exhaust treatment device (3) are connected via the supercharger (8) and the exhaust outlet pipe (10). A multi-cylinder engine with an exhaust treatment device, wherein the exhaust inlet case (7) is in communication. The multi-cylinder engine with an exhaust treatment device according to claim 1,
By providing a lead-out end flange (11) at the lead-out end of the exhaust lead-out pipe (10), and mounting the inlet flange (12) of the exhaust inlet case (7) on the lead-out end flange (11), an exhaust treatment device is provided. The exhaust inlet case (7) of (3) is supported by the exhaust outlet pipe (10),
An exhaust outlet case (13) is provided at the other end in the front-rear direction of the exhaust treatment device (3), the stay (4) is connected to the exhaust treatment device (3) on the exhaust outlet case (13) side, and an exhaust outlet pipe By mounting the stay (4) on the lead-out end flange (11) of (10), a portion on the exhaust outlet case (13) side of the exhaust treatment device (3) is connected to the exhaust lead-out pipe ( 10. A multi-cylinder engine with an exhaust treatment device connected to 10). The multi-cylinder engine with an exhaust treatment device according to claim 2,
One end of the stay (4) is attached to the outlet end flange (11) of the exhaust outlet pipe (10), and the other end of the stay (4) is attached to the cylinder head (1). A multi-cylinder engine with an exhaust treatment device, which is attached to a cooling water outlet flange (15).

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