JP2003254051A - Engine with exhaust turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform activation by accelerating temperature rise of an exhaust gas purification catalyst at cold start. <P>SOLUTION: In this engine 20, the exhaust gas purification catalyst 31 is provided at a downstream side of an exhaust gas passage 30 of the exhaust turbocharger 22, and a waste gate valve 33 is provided to a bypass passage 32. A valve 34 capable of opening/closing is provided to a turbine outlet 29 of the exhaust turbocharger 22. A control device 50 is provided which closes the valve 33 at cold start of the engine and opens the waste gate valve 33 thereby to heat the exhaust gas purification catalyst 31 by means of an exhaust gas from the bypass passage 32. Accordingly, at cold start of the engine, the exhaust gas can be directly introduced from the bypass passage 32 to the exhaust gas purification catalyst 31, whereby heating is performed by the exhaust gas in which temperature drop is small, and the activation of the catalyst is performed in a short period of time, thereby carrying out purification of the exhaust gas. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine equipped with an exhaust turbine supercharger, which is capable of activating the temperature rise of an exhaust gas purifying catalyst at a cold start earlier.

[0002]

2. Description of the Related Art Global environmental problems and resource saving problems caused by exhaust gas from automobiles are being highlighted worldwide, and it is an urgent task to improve exhaust gas and fuel consumption of automobile engines such as passenger cars. ing.

Various measures for improving such exhaust gas and fuel efficiency have been studied and embodied. One of them is to use an exhaust turbine supercharger for improving fuel efficiency by improving performance and purifying exhaust gas. Therefore, a three-way catalyst is used.

For example, in an engine equipped with an exhaust turbine supercharger, an exhaust gas inlet portion 4 of a turbine housing 3 of an exhaust turbine supercharger 2 is connected to an exhaust manifold 1 of the engine, as shown in the schematic configuration of FIG. , The inflowing exhaust gas is sent to the turbine impeller 6 via the turbine scroll portion 5 to be rotationally driven, the exhaust gas discharged from the exhaust gas outlet portion 7 is discharged to the exhaust gas flow passage 8, and the discharged exhaust gas is discharged. The exhaust gas purifying catalyst 9 provided on the downstream side of the exhaust gas passage 8 is passed through the exhaust gas purifying catalyst 9 to be purified and then discharged into the atmosphere.

Further, in order to control the supercharging pressure supplied to the engine, a bypass flow passage 10 for bypassing exhaust gas and a waste gate valve 11 are provided between the exhaust gas inlet portion 4 and the exhaust gas outlet portion 7, When the supply pressure exceeds the set value,
The waste gate valve 11 is opened so that a part of the exhaust gas is sent to the exhaust gas passage 8 by bypassing the turbine impeller 6.

[0006]

However, in the engine equipped with such an exhaust turbine supercharger, even when the engine is cold started (at the time of cold start), the exhaust manifold 1 of the engine is the same as in the normal operation. Exhaust gas discharged from the exhaust gas inlet portion 4 of the turbine housing 3
Is exhausted from the exhaust gas flow path 8 through the turbine scroll portion 5, the turbine impeller 6, and the exhaust gas outlet portion 7, so that the heat of the exhaust gas is taken away by each part of the turbine of the exhaust turbine supercharger, and the exhaust gas purification catalyst When the temperature reaches 9, there is a problem that the temperature drop is large, the activation of the catalyst is delayed, and the exhaust gas cannot be purified until the catalyst is activated.

Therefore, in order to accelerate the temperature rise of the exhaust gas purifying catalyst 9 at such a cold start, the waste gate valve 11 is opened to directly exhaust the exhaust gas to the exhaust gas passage 8.
It is possible to lead to
Since the bypass flow passage 10 provided with is thin, it is not possible to secure a sufficient flow rate of exhaust gas, and the turbine housing 3
A large amount of exhaust gas flows inside, and the catalyst cannot be activated in a short time.

The present invention has been made in view of the above problems of the prior art, and provides an engine with an exhaust turbine supercharger which can stop the temperature rise of the exhaust gas purifying catalyst at cold start and activate it. Is what you are trying to do.

[0009]

In order to solve the problems of the above-mentioned prior art, an engine with an exhaust turbine supercharger according to claim 1 of the present invention is provided downstream of an exhaust gas flow path of the exhaust turbine supercharger. With an exhaust gas purification catalyst,
An engine having a wastegate valve in a bypass flow path, wherein a valve that can be opened and closed is provided at a turbine outlet of the exhaust turbine supercharger, and the valve is closed at the cold start of the engine and the wastegate valve is opened. A control device for controlling the exhaust gas purifying catalyst to be heated by the exhaust gas from the bypass passage is provided.

According to this engine with an exhaust turbine supercharger, an exhaust gas purifying catalyst is provided downstream of the exhaust gas passage of the exhaust turbine supercharger, and a wastegate valve is provided in the bypass passage. A valve that can be opened and closed is provided at the turbine outlet of the exhaust turbine supercharger, the valve is closed at the time of cold start of the engine, and the waste gate valve is opened to exhaust the exhaust gas purifying catalyst with exhaust gas from the bypass passage. A control device that controls heating is installed.When the engine cold starts, the valve installed at the turbine outlet is closed and the waste gate valve is opened to guide exhaust gas directly from the bypass passage to the exhaust gas purification catalyst. It is possible to heat the exhaust gas with a small temperature drop to activate the catalyst in a short time and exhaust it. And to be able to purify gases.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the engine with an exhaust turbine supercharger has a bypass flow passage in which the waste gate valve is provided to the exhaust turbine supercharger. The exhaust gas inlet and the exhaust gas purifying catalyst are connected in the shortest way.

According to this engine with an exhaust turbine supercharger, the bypass passage provided with the waste gate valve is connected to the exhaust gas inlet to the exhaust turbine supercharger and the exhaust gas purifying catalyst at the shortest distance. In this configuration, the bypass flow path for guiding the exhaust gas to the catalyst is minimized to minimize the temperature drop of the exhaust gas and to activate the catalyst in a shorter time.

Further, in the engine with an exhaust turbine supercharger according to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the waste gate valve is provided in the bypass passage at the fully open position at cold start. The structure is characterized in that it does not interfere with the exhaust gas flowing through.

According to this engine with an exhaust turbine supercharger, the waste gate valve is constructed so as not to interfere with the exhaust gas flowing through the bypass passage at the fully open position at the time of cold start. Type By arranging the swing axis of the valve and increasing the opening of the valve, the waste gate valve is configured so that it does not collide with the exhaust gas and the temperature drop of the exhaust gas is suppressed as much as possible. The catalyst can be activated in time.

According to a fourth aspect of the present invention, an engine with an exhaust turbine supercharger has the control device and the wastegate valve at the cold start in addition to the configuration according to the first aspect. It is characterized in that it is fully opened and is controlled to an intermediate opening when adjusting the supercharging pressure.

According to this engine with an exhaust turbine supercharger, the control device has a configuration in which the waste gate valve is fully opened at the cold start and is controlled to an intermediate opening when the supercharging pressure is adjusted. The valve is fully opened to suppress the temperature drop due to the collision of exhaust gas, and the control unit controls the waste gas valve to bypass part of the exhaust gas when the original boost pressure is adjusted. I am trying to do it.

According to a fifth aspect of the present invention, in addition to the structure according to the first aspect, the engine with an exhaust turbine supercharger has the valve provided at the turbine outlet as a valve body and a stem. Is integrally formed, and the mounting groove portion of the stem is formed in the turbine housing and incorporated in the turbine housing.

According to this engine with an exhaust turbine supercharger, the valve provided at the turbine outlet is constructed by integrally forming the valve body and the stem, and the mounting groove portion of the stem is formed in the turbine housing. For example, by integrating the valve body and stem of the butterfly valve into the turbine housing by utilizing the mounting groove, the number of parts can be reduced and the size and size can be reduced. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 relate to an embodiment of an engine with an exhaust turbine supercharger of the present invention, and FIG. 1 (a) is a partially enlarged sectional view of an exhaust system,
FIG. 1B is a front view of the valve portion, and FIG. 2 is a schematic configuration diagram of an example of a control system at cold start.

This engine 20 with an exhaust turbine supercharger
1, the exhaust turbine supercharger 22 is provided, and the supercharging pressure is adjusted to the waste gate valve 33 and the control device 50.
The basic configuration of controlling the exhaust gas with the exhaust gas purifying catalyst 31 is the same as that of the engine of FIG. 4 already described.

The engine 20 with the exhaust turbine supercharger
Then, the exhaust gas inlet portion 24 of the turbine hose 23 of the exhaust turbine supercharger 22 is connected to the exhaust manifold 21 of the engine, and the inflowing exhaust gas is sent to the turbine impeller 26 via the turbine scroll portion 25 to be rotationally driven. A compressor impeller 28 mounted coaxially with the turbine shaft 27 supercharges intake air to the engine.

The exhaust gas driving the turbine impeller 26 is discharged from the exhaust gas outlet 29 of the turbine housing 23 to the exhaust gas flow passage 30, and the exhaust gas purifying catalyst provided downstream of the exhaust gas flow passage 30. After passing through 31, the gas is purified and then discharged into the atmosphere.

Further, the exhaust gas inlet portion 2 of the turbine housing 23 for controlling the supercharging pressure supplied to the engine.
A bypass passage 32 that bypasses the exhaust gas between the exhaust gas passage portion 4 and the exhaust gas outlet portion 29 and directly leads to the exhaust gas passage 30;
A waste gate valve 33 that opens and closes the bypass flow passage 32 is provided. When the supercharging pressure exceeds a set value, the waste gate valve 33 is opened, and a part of the exhaust gas is bypassed to the turbine impeller 26 to exhaust the exhaust gas flow passage 30. The output of the turbine is suppressed and the boost pressure is set to the set value.

In addition to such a basic structure, in the engine 20 with the exhaust turbine supercharger, the valve 34 is provided at the exhaust gas outlet 29 of the turbine housing 23 in order to accelerate the activation of the exhaust gas purifying catalyst 31 at the cold start. Is provided so that the exhaust gas outlet 29 can be sealed.

The valve 34 is composed of, for example, a butterfly valve, and as shown in FIG. 1 (b), a stem 36 projects from both ends in the radial direction of a disc-shaped valve body 35 and is integrally provided by welding or the like. The stem 36 is mounted (so-called tricked) via a mounting groove portion 37 corresponding to the stem 36 formed in the turbine housing 23 and is rotatably supported, and one stem 36 is connected to an operation shaft 38 from the outside. Then, the actuator 40 can be opened and closed via the operation lever 39. The turbine housing 23 in which the valve 34 is provided is provided with a step-like sealing surface 41 so that the valve 34 can be hermetically closed, and the stem 36 is provided so as to come into contact with the sealing surface 41 when the valve body 35 is closed. The seal surface 41 is formed by a step in the opposite direction with respect to the center.

The valve 34 has a valve body 35.
In addition to the case where the stems 36 are provided at both end portions, the stems may be provided only at one end portion, and separate ones may be attached by welding or the like, or may be integrally produced by casting or the like.

The valve 34 is fully closed by the actuator 40 at the cold start of the engine, and is in the fully open state at other times. For example, a negative pressure type actuator is used as the actuator 40 at the engine start. Valve 3 using the intake negative pressure of
4 is opened, and the others are opened to the atmosphere and the valve 34 is closed.

Further, in the engine 20 with the exhaust turbine supercharger, the exhaust gas to the turbine housing 23 is stopped by closing the valve 34 at the cold start of the engine, and the waste gate valve 33 in the bypass flow passage 32 is stopped.
The exhaust gas is sent directly to the exhaust gas purifying catalyst 31 through the exhaust gas flow path 30 to suppress the temperature drop of the exhaust gas on the way to activate the catalyst in a short time.

Therefore, the swing shaft 42 of the swing check valve constituting the wastegate valve 33 is externally attached to the swing shaft 42.
3 is connected and can be opened / closed by an actuator 45 via an operation lever 44.
For example, a negative pressure / positive pressure type actuator is used as 5, and the waste gate valve 33 is fully opened by using the intake negative pressure at the time of engine start, and otherwise the positive pressure at the time of supercharging is used as the waste gate valve 33. Is operated at an intermediate opening degree.

The actuator 4 of such a valve 34
0 and wastegate valve 33 actuator 4
As a control device 50 for controlling the engine 5, as shown in FIG. 2, an engine control unit (ECU) 51 is used, and each actuator 40, 45 and an intake manifold of the engine via a negative pressure three-way valve 52 (see FIG. (Not shown) is connected by a negative pressure pipe 53 so that negative pressure can be used, and the positive pressure side of the actuator 45 can also use the positive pressure of the intake manifold of the engine to control the electromagnetic control valve (D
SV) 54 is connected by positive pressure piping 55.

Therefore, in the engine 20 with the exhaust turbine supercharger, at the cold start of the engine,
The negative pressure three-way valve 52 is driven by a drive signal from the engine control unit 51 to drive each actuator 4
0 and 45 act on the negative pressure generated in the intake manifold via the negative pressure pipe 53, the valve 34 is closed to prevent exhaust gas from flowing in the turbine housing 23, and the waist of the bypass passage 32 is prevented. The gate valve 33 is opened so that the exhaust gas is directly sent to the exhaust gas purifying catalyst 31 through the exhaust gas passage 30.

As a result, it is possible to suppress the temperature drop of the exhaust gas on the way and activate the catalyst in a short time, and it is possible to purify the exhaust gas even at the cold start.

On the other hand, since the exhaust turbine supercharger 22 is supercharged except during cold start, the negative pressure three-way valve 5 is driven by the drive signal from the engine control unit 51.
2, the negative pressure pipe 53 connected to each of the actuators 40 and 45 is opened to the atmosphere, and the valve 34 is fully opened to allow the exhaust gas to flow in the turbine housing 23. The gate valve 33 is fully closed.

When the boost pressure exceeds the set value, the positive pressure of the intake manifold is applied to the positive pressure pipe 55 connected to the actuator 45, and the electromagnetic control valve is driven by the drive signal from the engine control unit 51. (DSV)
The wastegate valve 3 is controlled by controlling 54 to adjust the positive pressure.
By opening 3 to bypass a part of the exhaust gas to the bypass passage 32, the turbine output is suppressed and the supercharging pressure is adjusted.

The temperature of the exhaust gas purification catalyst rises,
The activation of the catalyst is detected by a temperature sensor or the like, and after the detection, the negative pressure three-way valve 53 is switched to change the exhaust turbine supercharger 2
Put 2 into normal operating condition.

According to the engine 20 with the exhaust turbine supercharger, the valve 34 provided at the exhaust gas outlet 29 is closed and the waste gate valve 33 is opened at the cold start of the engine to directly exhaust the exhaust gas from the bypass passage 32. The gas can be guided to the exhaust gas purifying catalyst 31, and the exhaust gas can be purified by heating the exhaust gas with a small temperature drop for a short time to activate the catalyst.

Further, in the engine 20 with an exhaust turbine supercharger, in order to suppress the temperature drop of the exhaust gas at the cold start, it is preferable that the bypass passage 32 has a large pipe diameter and a short pipe length. Is obtained from the thermal analysis result, the bypass flow passage 33 is connected to the exhaust gas inlet 24 to the exhaust turbine supercharger 32 and the exhaust gas purifying catalyst 3
1 is made thicker than the conventional flow path so that it is connected to the turbine housing 23 at a shortest distance, and the flow path is oblique rather than perpendicular to the turbine housing 23 so that the pipe length is short and the exhaust gas flows smoothly. is there. Further, the exhaust gas is made to flow more smoothly by providing the cutout portion 32a at the outlet portion of the bypass flow passage 32, thereby further suppressing the temperature drop.

Further, in the engine 20 with the exhaust turbine supercharger, since the bypass passage 32 is formed as an oblique passage rather than a direction perpendicular to the turbine housing 23, the exhaust gas inlet 24 of the turbine housing 23 is formed.
Of the exhaust gas inlet portion 24 by making the flange 24a of the engine 20 at a right angle to the bypass passage 32, and also making the flange 21a of the exhaust manifold 21 of the engine at a right angle to the bypass passage 32. And the exhaust gas purifying catalyst 31 are connected by the shortest flow path.

Further, in the engine 20 with the exhaust turbine supercharger, the temperature drop is suppressed by preventing the waste gate valve 33 provided in the bypass passage 32 from interfering with the exhaust gas flowing at the cold start.
The diameter of the valve port is increased, and the swing check valve swing shaft 42 is arranged outside the oblique bypass flow passage 32 on the side where the waste gate valve 33 can be fully opened and parallel to the flow passage at a small angle. I am doing it.

That is, in the illustrated example, as shown in FIG. 1A, the oblique bypass flow passage 32 is inclined from the upper right to the lower left.
Since the waste gate valve 33 opens and closes the valve ports on the upper and lower straight lines, the swing shaft 42 is disposed above the bypass flow passage 32, and is swung about 60 degrees to be fully opened, thereby bypass flow. It is possible to withdraw so that it does not collide with the exhaust gas that is parallel to or behind the road 32 (the vertical and horizontal directions here are unrelated to the actual direction to the engine, Things, which have been set for the sake of explanation.)

The wastegate valve 33 is fully opened so that it does not interfere with (collide with) the exhaust gas flowing through the bypass passage 32. At the cold start, the wastegate valve 33 is fully opened to suppress the temperature drop of the exhaust gas. I have to.

When adjusting the original supercharging pressure,
It suffices if a part of the exhaust gas can be bypassed, and problems such as temperature drop due to interference with the valve do not occur.

The bypass passage 32 in which the waste gate valve 33 is provided is connected to the turbine housing 23.
According to the engine 20 with an exhaust turbine supercharger, which is configured by an oblique flow path so as to connect the exhaust gas inlet part 24 and the exhaust gas purification catalyst 31 of the shortest, the exhaust gas at the time of cold start is short and thick by-pass flow path. Exhaust gas purification catalyst 3 at 32
Therefore, the temperature drop of the exhaust gas can be suppressed as much as possible, and the catalyst can be activated in a shorter time.

Further, the waste gate valve 33 is arranged such that the swing shaft 42 is arranged outside so as not to interfere with the exhaust gas flowing in the bypass passage 32 at the fully opened position at the cold start, and the opening degree of the valve is increased. According to the engine 20 with the exhaust turbine supercharger, the waste gate valve 33 and the exhaust gas can be prevented from colliding with each other, and the temperature drop of the exhaust gas can be suppressed as much as possible, thereby also activating the catalyst in a shorter time. be able to.

Further, according to the engine 20 with the exhaust turbine supercharger in which all the configurations of the bypass flow passage 32 and the waste gate valve 33 are combined, the exhaust gas of the turbine housing 23 of the exhaust turbine supercharger 22 is The temperature drop of the exhaust gas between the inlet portion 34 and the exhaust gas outlet portion 29 is about 40, as shown by the solid line in FIG.
It can be suppressed to about ℃.

In the conventional engine, since the exhaust gas passes through the turbine scroll portion of the turbine housing to reach the exhaust gas outlet portion, the temperature drop of the exhaust gas is about as shown by the broken line in FIG. It is very large at about 175 ° C., and it can be seen that it takes time to activate the catalyst.

In the above embodiment, the valve provided at the exhaust gas outlet is a butterfly valve. However, the valve is not limited to this but may be a valve having an oblique sealing surface such as a gate valve or another type of valve. You can

Further, the actuator for operating the valve and wastegate valve is constituted by the diaphragm type which utilizes the negative pressure and the positive pressure generated in the intake manifold.
However, the present invention is not limited to this, and may be a pneumatic type using compressed air or other fluid pressure operated type, or a motor type or electromagnetic type electric type.

[0049]

According to the engine with an exhaust turbine supercharger according to claim 1 of the present invention as specifically described above with reference to the embodiment, the exhaust gas flow passage downstream of the exhaust turbine supercharger is provided. Equipped with an exhaust gas purification catalyst,
In an engine having a wastegate valve in a bypass flow path, a valve that can be opened and closed is provided at a turbine outlet of the exhaust turbine supercharger, and the valve is closed at the cold start of the engine, and the wastegate valve is opened. Since a control device was installed to control the exhaust gas purifying catalyst to be heated by the exhaust gas from the bypass passage, the valve provided at the turbine outlet was closed at the cold start of the engine, and the wastegate valve was opened to bypass the bypass flow. The exhaust gas can be directly introduced from the passage to the exhaust gas purifying catalyst, and the exhaust gas can be purified by heating the exhaust gas with a small temperature drop to activate the catalyst in a short time.

According to the engine with an exhaust turbine supercharger according to claim 2 of the present invention, the bypass passage provided with the waste gate valve is provided with the exhaust gas inlet to the exhaust turbine supercharger and the exhaust gas. Since the purification catalyst is connected in the shortest distance, the bypass passage that guides the exhaust gas to the catalyst is made the shortest to suppress the temperature drop of the exhaust gas as much as possible, and the catalyst can be activated in a shorter time.

Further, according to the engine with an exhaust turbine supercharger according to claim 3 of the present invention, the waste gate valve is configured not to interfere with the exhaust gas flowing through the bypass passage at the fully open position at the cold start. Therefore, for example, by arranging the swing shaft of a swing-type valve that swings and opens and closes, and by configuring the wastegate valve such as increasing the opening of the valve, the temperature of the exhaust gas can be prevented from colliding with the exhaust gas. The fall is suppressed as much as possible, which also makes it possible to activate the catalyst in a shorter time.

Further, according to the engine with the exhaust turbine supercharger according to the fourth aspect of the present invention, the control device causes the waste gate valve to be fully opened at the cold start,
Since it is configured to control the intermediate opening when adjusting the supercharging pressure,
At cold start, the wastegate valve is fully opened to suppress the temperature drop due to collision of exhaust gas, and when controlling the supercharging pressure, a part of the exhaust gas is controlled by the control device to control the wastegate valve at cold start. It can also be used for catalyst activation.

Further, according to the fifth aspect of the present invention, in the engine with the exhaust turbine supercharger, the valve provided at the turbine outlet is formed integrally with the valve body and the stem, and the mounting groove portion of the stem is provided. Since it is configured to be formed in the turbine housing and incorporated in the turbine housing, for example, by integrating the valve body and the stem of the butterfly valve into the turbine housing by using the mounting groove, it is possible to reduce the number of parts. Can be made compact and compact.

[Brief description of drawings]

1 is a partial enlarged sectional view of an exhaust system according to an embodiment of an engine with an exhaust turbine supercharger of the present invention, and FIG. 1B is a front view of a valve portion.

FIG. 2 is a schematic configuration diagram of an example of a control system at cold start according to an embodiment of an engine with an exhaust turbine supercharger of the present invention.

FIG. 3 is an explanatory diagram showing a temperature drop of exhaust gas according to an embodiment of an engine with an exhaust turbine supercharger of the present invention in comparison with a conventional engine.

FIG. 4 is a schematic configuration diagram of a conventional exhaust turbine supercharger engine.

[Explanation of symbols]

20 Exhaust turbine engine with supercharger 21 Exhaust manifold 22 Exhaust turbine supercharger 23 Turbine housing 24 Exhaust gas inlet (exhaust gas inlet) 25 Turbine scroll 26 turbine impeller 27 turbine shaft 28 Compressor impeller 29 Exhaust gas outlet (exhaust gas outlet) 30 exhaust gas flow path 31 Exhaust gas purification catalyst 32 bypass flow path 33 waste gate valve 34 valve 35 Valve body 36 stems 37 Mounting groove 40 actuators 45 actuator 50 controller 51 ECU 52 Negative pressure three-way valve 54 Electromagnetic control valve 55 Positive pressure piping

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02D 23/00 F02D 43/00 301R 43/00 301 301T 301Z F02B 37/12 301E (72) Inventor Hiroshi Furukawa 2-1-1 Toyosu Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd., Tokyo 1st factory (72) Inventor Tomomi Mineda 2-1-1, Toyosu Ishikawajima, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd., Tokyo 1st factory ( 72) Inventor Nobuyuki Ikeya 1-1-1, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo First Factory F-term (reference) 3G005 EA16 FA35 GA03 GB28 GC05 GD07 GD09 GE09 HA18 JA16 JA24 3G084 AA00 BA08 BA19 BA24 CA01 CA02 DA10 3G091 AA10 AB01 BA03 CA01 FA01 FC05 GA06 HB06 3G092 AA18 CB01 DB03 DC12 DC15 DF02 DG06 FA15 GA01

Claims (5)

[Claims] 1. An engine having an exhaust gas purification catalyst downstream of an exhaust gas flow path of an exhaust turbine supercharger and a waste gate valve in a bypass flow path, the turbine outlet of the exhaust turbine supercharger. A control device that is provided with a valve that can be opened and closed, closes the valve when the engine cold starts, and opens the wastegate valve to control the exhaust gas purifying catalyst to be heated by the exhaust gas from the bypass passage. An engine with an exhaust turbine supercharger characterized by being installed. 2. The bypass flow path in which the waste gate valve is provided is configured to connect the exhaust gas inlet to the exhaust turbine supercharger and the exhaust gas purifying catalyst in the shortest distance. An engine with an exhaust turbine supercharger according to 1. 3. The waste gate valve is configured so as not to interfere with exhaust gas flowing through the bypass passage at a fully opened position at cold start.
Or an engine with an exhaust turbine supercharger according to 2. 4. The control device according to claim 1, wherein the waste gate valve is fully opened at a cold start and is controlled to an intermediate opening at a supercharging pressure adjustment. Exhaust turbine engine with supercharger. 5. The valve provided at the turbine outlet has a valve body and a stem that are integrally formed,
The engine with an exhaust turbine supercharger according to any one of claims 1 to 4, wherein the mounting groove portion of the stem is formed in a turbine housing and incorporated in the turbine housing.