阅读说明：本技术 一种排气装置及其控制方法 (Exhaust device and control method thereof ) 是由 陈俊杰 曲函师 孙博 翁妍 卢秋佐 于 2020-04-17 设计创作，主要内容包括：本发明涉及汽车技术领域,具体公开了一种排气装置及其控制方法,其包括排气管和催化器,排气管安装于发动机的排气端；催化器设于所述排气管中,所述催化器与所述发动机的距离可调。本发明提供的排气装置通过改变催化器的位置来控制其温度,在催化器内的温度过低时,将催化器靠近发动机以提升催化器的温度,在催化器内的温度过高时,将催化器远离发动机以降低催化器的温度或控制催化器的温度保持稳定。如此可在一定程度上减少或者避免发动机为了改变排气温度而造成的油耗损失及功率下降。(The invention relates to the technical field of automobiles, and particularly discloses an exhaust device and a control method thereof, wherein the exhaust device comprises an exhaust pipe and a catalyst, wherein the exhaust pipe is arranged at the exhaust end of an engine; the catalyst is arranged in the exhaust pipe, and the distance between the catalyst and the engine is adjustable. The exhaust device provided by the invention controls the temperature of the catalyst by changing the position of the catalyst, when the temperature in the catalyst is too low, the catalyst is close to the engine to increase the temperature of the catalyst, and when the temperature in the catalyst is too high, the catalyst is far away from the engine to reduce the temperature of the catalyst or control the temperature of the catalyst to keep stable. Therefore, the fuel consumption loss and the power reduction of the engine for changing the exhaust temperature can be reduced or avoided to a certain extent.)

1. An exhaust apparatus, comprising:

an exhaust pipe (1) attached to an exhaust end of an engine (10);

and the catalyst (2) is arranged in the exhaust pipe (1), and the distance between the catalyst (2) and the engine (10) is adjustable.

2. An exhaust apparatus according to claim 1, wherein the catalyst (2) is slidably disposed in the exhaust pipe (1) in an axial direction of the exhaust pipe (1) so as to be close to or away from the engine (10), the exhaust apparatus further comprising:

and the driving mechanism (3) is in driving connection with the catalyst (2) and is used for driving the catalyst (2) to slide.

3. An exhaust device according to claim 2, characterized in that the drive mechanism (3) comprises:

a drive member (31) connected to the exhaust pipe (1);

a gear (32) connected to an output end of the driving member (31), wherein the driving member (31) can drive the gear (32) to rotate;

and the rack (33) is meshed with the gear (32) and is arranged in the exhaust pipe (1) in a sliding manner, and one end of the rack (33) is connected with the catalyst (2).

4. The exhaust apparatus of claim 1, further comprising:

a seal member (4) provided between the catalyst (2) and the exhaust pipe (1).

5. An exhaust arrangement according to claim 1, characterized in that the exhaust pipe (1) comprises an adjusting pipe section (11) and a mounting pipe section (12), the length of the adjusting pipe section (11) being adjustable, the adjusting pipe section (11) being located on the side of the mounting pipe section (12) close to the engine (10), the catalyst (2) being arranged in the mounting pipe section (12).

6. The exhaust device according to claim 5, characterized in that the adjusting pipe section (11) is slidably sleeved outside the mounting pipe section (12).

7. The exhaust apparatus according to any one of claims 1 to 6, further comprising:

the cooling pipeline (5), the inlet end and the end of giving vent to anger of cooling pipeline (5) respectively with blast pipe (1) is connected, just the end of giving vent to anger of cooling pipeline (5) is located keeping away from of the inlet end of cooling pipeline (5) one side of engine (10).

8. The exhaust apparatus of claim 7, further comprising:

a valve assembly connected to the cooling line (5) and capable of bringing the exhaust device into a first state in which exhaust gases enter the catalyst (2) via the exhaust pipe (1) and into a second state; and the second state is that the tail gas enters the catalyst (2) after being cooled by the cooling pipeline (5).

9. The exhaust apparatus as claimed in claim 8, wherein the valve assembly comprises:

the conversion valve (7) is rotationally connected to the joint of the cooling pipeline (5) and the exhaust pipe (1) to rotate to a first angle, so that the cooling pipeline (5) is disconnected with the exhaust pipe (1) and the exhaust pipe (1) is conducted, or rotate to a second angle, so that the cooling pipeline (5) is communicated with the exhaust pipe (1) and the exhaust pipe (1) is disconnected.

10. A control method for controlling the exhaust apparatus according to any one of claims 1 to 9, comprising:

the method comprises the following steps that an engine (10) is in a working state, whether the temperature of a catalyst (2) is lower than a preset low temperature or not is detected, and if yes, the catalyst (2) is controlled to be located at a first preset position; if not, judging whether the temperature of the catalyst (2) is higher than a preset high temperature or not, if so, controlling the catalyst (2) to be located at a second preset position, wherein the distance between the first preset position and the air inlet end of the exhaust pipe (1) is smaller than the distance between the second preset position and the air inlet end of the exhaust pipe (1).

Technical Field

The invention relates to the technical field of automobiles, in particular to an exhaust device and a control method thereof.

Background

The catalyst is one of the main components for the after-treatment of engine exhaust, and can convert HC and No in automobile exhaust at a certain temperature_xAnd conversion of CO to CO₂And H₂O。

The light-off temperature of the catalyst is generally around 350 ℃ and the maximum temperature of the catalyst is around 950 ℃. At the initial stage of cold start of an automobile, the exhaust temperature of the engine needs to be increased as much as possible, so that the catalyst is heated and ignited as soon as possible, and under the high-load working condition, the exhaust temperature of the engine needs to be reduced, so that the catalyst is protected from being damaged due to high temperature. Both of these conditions result in increased fuel consumption and decreased power.

Disclosure of Invention

The invention aims to provide an exhaust device and a control method thereof, which are used for reducing or avoiding oil consumption loss and power reduction caused by changing exhaust temperature of an engine.

In order to achieve the purpose, the invention adopts the following technical scheme:

an exhaust apparatus comprising:

the exhaust pipe is arranged at the exhaust end of the engine;

and the catalyst is arranged in the exhaust pipe, and the distance between the catalyst and the engine is adjustable.

Preferably, the catalyst is slidably disposed in the exhaust pipe in an axial direction of the exhaust pipe so as to be close to or distant from the engine, and the exhaust apparatus further includes:

and the driving mechanism is in driving connection with the catalyst and is used for driving the catalyst to slide.

Preferably, the drive mechanism includes:

the driving piece is connected to the exhaust pipe;

the gear is connected to the output end of the driving piece, and the driving piece can drive the gear to rotate;

and the rack is meshed with the gear and is arranged in the exhaust pipe in a sliding manner, and one end of the rack is connected with the catalyst.

Preferably, the exhaust apparatus further includes:

a sealing member disposed between the catalyst and the exhaust pipe.

Preferably, the exhaust pipe comprises an adjusting pipe section and a mounting pipe section, the length of the adjusting pipe section is adjustable, the adjusting pipe section is located on one side, close to the engine, of the mounting pipe section, and the catalyst is arranged on the mounting pipe section.

Preferably, the adjusting pipe section is slidably sleeved outside the mounting pipe section.

Preferably, the exhaust apparatus further includes:

and the air inlet end and the air outlet end of the cooling pipeline are respectively connected with the exhaust pipe, and the air outlet end of the cooling pipeline is positioned at one side, far away from the engine, of the air inlet end of the cooling pipeline.

Preferably, the exhaust apparatus further includes:

the valve assembly is connected to the cooling pipeline and can enable the exhaust device to be in a first state and a second state, and the first state is that the tail gas enters the catalyst through the exhaust pipe; and the second state is that the tail gas enters the catalyst after being cooled by the cooling pipeline.

Preferably, the valve assembly comprises:

and the conversion valve is rotationally connected to the joint of the cooling pipeline and the exhaust pipe so as to rotate to a first angle, disconnect the cooling pipeline from the exhaust pipe and conduct the exhaust pipe, or rotate to a second angle, connect the cooling pipeline with the exhaust pipe and disconnect the exhaust pipe.

The invention adopts the following technical scheme:

a control method for controlling an exhaust apparatus as described above, comprising:

the method comprises the steps that an engine is in a working state, whether the temperature of a catalyst is lower than a preset low temperature or not is detected, and if yes, the catalyst is controlled to be located at a first preset position; if not, judging whether the temperature of the catalyst is higher than a preset high temperature or not, if so, controlling the catalyst to be located at a second preset position, wherein the distance between the first preset position and the air inlet end of the exhaust pipe is smaller than the distance between the second preset position and the air inlet end of the exhaust pipe.

The invention has the beneficial effects that: the exhaust device provided by the invention controls the temperature of the catalyst by changing the position of the catalyst, when the temperature in the catalyst is too low, the catalyst is close to the engine to increase the temperature of the catalyst, and when the temperature in the catalyst is too high, the catalyst is far away from the engine to reduce the temperature of the catalyst or control the temperature of the catalyst to keep stable. Therefore, the fuel consumption loss and the power reduction of the engine for changing the exhaust temperature can be reduced or avoided to a certain extent.

Drawings

FIG. 1 is a schematic structural diagram of an exhaust apparatus coupled to an engine according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the exhaust pipe connected to the driving mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another exhaust apparatus provided in the first embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an exhaust apparatus connected to an engine according to a second embodiment of the present invention;

FIG. 5 is a schematic structural view of another exhaust apparatus coupled to an engine according to a second embodiment of the present invention;

fig. 6 is a schematic structural view of an exhaust apparatus provided in the third embodiment of the present invention in a second state;

fig. 7 is a schematic structural diagram of an exhaust apparatus in a first state according to a third embodiment of the present invention.

In the figure:

1. an exhaust pipe; 11. adjusting the pipe section; 12. installing a pipe section;

2. a catalyst;

3. a drive mechanism; 31. a drive member; 32. a gear; 33. a rack;

4. a seal member; 5. a cooling pipeline; 6. a heat sink; 7. a switching valve;

10. an engine.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the present invention, the directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for easy understanding without making a contrary explanation, and thus do not limit the scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides an exhaust apparatus including an exhaust pipe 1 and a catalyst 2. The exhaust pipe 1 is installed at the exhaust end of the engine 10, the catalyst 2 is arranged in the exhaust pipe 1, and the distance between the catalyst 2 and the engine 10 is adjustable.

When the temperature in the catalyst 2 is excessively low, the catalyst 2 moves to the side of the intake end of the exhaust pipe 1, that is, the catalyst 2 comes close to the engine 10. On the one hand, the engine 10 generates heat radiation, the temperature of the environment near the engine 10 is high, and the temperature of the catalyst 2 is further increased, on the other hand, the time for the exhaust gas to flow in the exhaust pipe 1 is short, and the temperature of the exhaust gas entering the catalyst 2 is high, so that the temperature of the catalyst 2 is increased. When the temperature in the catalyst 2 is appropriate, the catalyst 2 is kept stationary; when the temperature in the catalyst 2 is too high, the catalyst 2 moves to the side far away from the air inlet end of the exhaust pipe 1, namely the catalyst 2 is far away from the engine 10, on one hand, the catalyst 2 is less affected by the heat radiation of the engine 10, on the other hand, the time for the tail gas to flow in the exhaust pipe 1 is long, and the temperature of the tail gas entering the catalyst 2 is reduced, so that the temperature of the catalyst 2 is reduced or kept stable. The present embodiment provides an exhaust apparatus that brings the catalyst 2 close to the engine 10 to raise the temperature of the catalyst 2 when the engine 10 is cold started, and that brings the catalyst 2 away from the engine 10 to lower the temperature of the catalyst 2 or control the temperature of the catalyst 2 to remain stable when the exhaust gas temperature is too high. This may reduce or avoid fuel consumption and power loss of the engine 10 to varying exhaust temperatures.

As shown in fig. 2, it is preferable that the catalyst 2 be slidably disposed in the exhaust pipe 1 in the axial direction of the exhaust pipe 1 so as to be close to or distant from the engine 10. The exhaust device further comprises a driving mechanism 3, and the driving mechanism 3 is in driving connection with the catalyst 2 and is used for driving the catalyst 2 to be close to or far away from the air inlet end of the exhaust pipe 1. Further, the driving mechanism 3 includes a driving member 31, a gear 32, and a rack 33, the driving member 31 being connected to the exhaust pipe 1; the gear 32 is connected with the output end of the driving piece 31, and the driving piece 31 can drive the gear 32 to rotate; the rack 33 is engaged with the gear 32 and slidably disposed in the exhaust pipe 1, and one end of the rack 33 is connected to the catalyst 2. The drive member 31 is preferably a servo motor, and in order to avoid the drive member 31 from being damaged due to excessive temperature, the drive member 31 is preferably arranged outside the exhaust pipe 1, and the output shaft of the drive member 31 extends through the exhaust pipe 1 into the exhaust pipe 1 and is connected with the gear 32. The driving member 31 is fixed to the exhaust pipe 1 by welding or screws. The output shaft of the driving piece 31 rotates forwards, the driving rack 33 and the catalytic converter 2 are close to the engine 10, the output shaft of the driving piece 31 rotates backwards, and the driving rack 33 and the catalytic converter 2 are far away from the engine 10; or the output shaft of the driving member 31 rotates reversely, the driving rack 33 and the catalyst 2 approach the engine 10, the output shaft of the driving member 31 rotates normally, and the driving rack 33 and the catalyst 2 are far away from the engine 10.

In order to further reduce the temperature of the drive mechanism 3, the drive mechanism 3 is provided on the side of the catalyst 2 remote from the intake end of the exhaust pipe 1.

In order to facilitate the movement of the catalyst 2 in the exhaust pipe 1 and to leave a certain gap between the catalyst 2 and the exhaust pipe 1, the exhaust apparatus further includes a sealing member 4 for preventing exhaust gas from leaking out through the gap, the sealing member 4 being disposed between the catalyst 2 and the exhaust pipe 1.

Preferably, the sealing member 4 is sleeved outside the catalyst 2. The sealing element 4 comprises a lantern ring and a convex ring, and the lantern ring is sleeved outside the catalytic converter 2; the bulge loop sets up outside the lantern ring, bulge loop and the inner wall butt of blast pipe 1. The seal 4 may be made of a high temperature resistant metal. Of course, in other embodiments, the sealing element 4 may also be fixed to the inner wall of the exhaust pipe 1, with the protruding ring abutting the circumference of the catalyst 2. The convex ring can reduce the contact area of the sealing element 4 and the exhaust pipe 1 and reduce the friction resistance between the sealing element 4 and the exhaust pipe 1.

As shown in fig. 3, preferably, in order to further increase the cooling speed of the catalyst 2, the exhaust apparatus further includes a cooling pipeline 5, an air inlet end and an air outlet end of the cooling pipeline 5 are respectively connected to the exhaust pipe 1, and the air outlet end of the cooling pipeline 5 is located on a side of the air inlet end of the cooling pipeline 5 away from the engine 10. When it is desired to reduce the temperature of the catalyst 2, the exhaust gases can be led through the cooling line 5 and into the catalyst 2. In order to further reduce the temperature of the catalyst 2, the exhaust device may further comprise a cooling fin 6, the cooling fin 6 being connected to the outside of the cooling pipe 5.

When the temperature of the catalyst 2 is low, the exhaust gas does not flow through the cooling pipeline 5, and therefore, in order to control the way through which the exhaust gas flows, the exhaust device further comprises a valve assembly, the valve assembly is connected to the cooling pipeline 5 and enables the exhaust device to be in a first state and a second state, the first state is that the exhaust gas enters the catalyst 2 through the exhaust pipe 1, namely the first state is that the exhaust gas does not pass through the cooling pipeline 5, but the exhaust gas flows into the exhaust pipe 1 after being discharged from the engine 10, and then flows into the catalyst 2 through the exhaust pipe 1. The second state is that the tail gas enters the catalyst 2 after being cooled by the cooling pipeline 5, and it can be understood that the tail gas can directly enter the catalyst 2 after being cooled by the cooling pipeline 5, or can indirectly enter the catalyst 2 after being cooled by the cooling pipeline 5. Specifically, in the present embodiment, after being exhausted from the engine 10, the exhaust gas flows into the exhaust pipe 1, the cooling line 5, the exhaust pipe 1, and the catalyst 2 in sequence, the exhaust gas in the exhaust pipe 1 located upstream of the valve assembly is the exhaust gas that is not cooled by the cooling line 5, and the exhaust gas in the exhaust pipe 1 located downstream of the valve assembly is the exhaust gas that is cooled by the cooling line 5.

Preferably, the valve assembly comprises a switching valve 7, the switching valve 7 being rotatably connected to the connection between the cooling line 5 and the exhaust pipe 1. The switching valve 7 can be rotated to a first angle to disconnect the cooling pipe 5 from the exhaust pipe 1 and to connect the exhaust pipe 1, and at this time, the exhaust device is in a first state. The changeover valve 7 can also be rotated to a second angle to connect the cooling line 5 to the exhaust pipe 1 and disconnect the exhaust pipe 1, in which case the exhaust device is in the second state. The installation position of the switching valve 7 is reasonably designed, so that the on-off of the cooling pipeline 5 and the on-off of the exhaust pipe 1 can be realized only through one switching valve 7, and the exhaust device is low in cost.

Specifically, the switching valve 7 may be rotatably connected to a side of the air inlet end of the cooling pipeline 5 near the air outlet end as shown in fig. 3, and of course, may also be rotatably connected to a side of the air outlet end of the cooling pipeline 5 near the air inlet end. Of course, in other embodiments, the valve assembly may further include a cooling pipe valve and an exhaust pipe valve, the cooling pipe valve is connected to the cooling pipeline 5 and is used for controlling the opening and closing of the cooling pipeline 5, and the exhaust pipe valve is connected to the exhaust pipe 1 and is used for controlling the opening and closing of the exhaust pipe 1.

Preferably, the exhaust device provided by the present embodiment may further include a controller, and the driving mechanism 3 and the valve assembly are electrically connected to the controller. In this embodiment, the controller may be a single-chip microcomputer or may be formed by a plurality of distributed single-chip microcomputers, and the single-chip microcomputers may run control programs to control the driving mechanism 3 and the valve assembly to realize the functions thereof.

The present embodiment also provides a control method for controlling the exhaust apparatus described above, including: when the engine 10 is in a working state, detecting whether the temperature of the catalytic converter 2 is lower than a preset low temperature, and if so, controlling the catalytic converter 2 to be located at a first preset position; if not, whether the temperature of the catalyst 2 is higher than a preset high temperature or not is judged, if so, the catalyst 2 is controlled to be located at a second preset position, and the distance between the first preset position and the engine 10 is smaller than the distance between the second preset position and the engine 10. The preset low temperature may be 350 deg.c and the preset high temperature may be 850 deg.c-950 deg.c. The control method provided by the embodiment achieves the purpose of rapidly heating up or cooling down the catalyst 2 by controlling the position of the catalyst 2 without changing the efficiency of the engine 10, thereby reducing or avoiding the fuel consumption loss and power reduction of the engine 10 caused by changing the exhaust temperature to a certain extent.