Device and method for controlling automatic switching of exhaust gas outlet in a vehicle

Abstract

The present invention relates to an automatic exhaust gas outlet switching control device and a control method in a vehicle, wherein exhaust gas outlets are installed at the upper and lower parts of the vehicle, respectively, so that when a worker follows the vehicle, the exhaust gas is discharged only through the upper outlet, and when driving at high speed or when a diesel particulate filter (DPF) is operating, it is discharged through both the upper and lower outlets. The exhaust gas outlet automatic switching control device in a vehicle according to the present invention comprises: a first exhaust pipe having an inlet formed at one end connected to a main exhaust pipe and a lower outlet formed at the other end, and provided to be inclined downward toward the lower outlet, with a branch pipe formed in the inclined section; a second exhaust pipe having an upper outlet formed at one end connected to the branch pipe of the first exhaust pipe and an upper outlet located at the top of the vehicle at the other end; and a direction switching valve provided between the lower outlet of the first exhaust pipe and the branch pipe, which causes exhaust gas to be discharged to the lower outlet or the upper outlet as it opens and closes; wherein the exhaust gas outlet automatic switching control device in a vehicle comprises: a DC-DC converter that receives power charged in a battery and outputs internal driving power (Vdd) to a microcontroller unit (MCU) while outputting motor driving power; and an engine key recognition unit that recognizes the state in which the engine switch of the vehicle is turned on and the engine is operating, and transmits this to the microcontroller unit (MCU). It includes: a DPF key recognition unit that recognizes the state in which a diesel particulate filter (DPF) is operated to burn and eliminate captured fine dust when the DPF switch is turned on, and transmits this to a microcontroller unit (MCU); a C-CAN interface that recognizes the vehicle's status, including the vehicle's driving speed, through a real-time communication method using C-CAN (C-CAN_H) (C-CAN_L) and transmits this to the microcontroller unit (MCU); and a valve driving unit that opens and closes by rotating an opening / closing plate through a control signal from a microcontroller unit (MCU) that determines the current vehicle status based on input through the engine key recognition unit, the DPF key recognition unit, and the C-CAN interface.

Description

Technology Field

[0001] The present invention relates to an automatic exhaust gas outlet switching control device and a control method in a vehicle. More specifically, the invention relates to an automatic exhaust gas outlet switching control device and a control method in a vehicle in which exhaust gas outlets are installed at the top and bottom of the vehicle, respectively, so that when an operator follows behind the vehicle, the exhaust gas is discharged only through the upper outlet, and when driving at high speed or when a diesel particulate filter (DPF) is operating, the exhaust gas is discharged through both the upper and lower outlets. Background Technology

[0003] Generally, an exhaust system designed to effectively discharge exhaust gases from the combustion of fuel in a vehicle consists mainly of an exhaust manifold, a front pipe, a catalytic converter, an air-fuel ratio sensor, a middle pipe, a muffler, and a rear pipe.

[0004] An exhaust system with this configuration mitigates and attenuates the strong impact noise of exhaust gases emitted from the combustion chamber to prevent noise from exceeding a certain level, minimizes power loss due to exhaust gas flow or back pressure, and functions to reduce harmful substances in the exhaust gas to below specified values ​​through a catalytic converter.

[0005] Such an exhaust system is primarily installed on the underside of the vehicle, and the rear pipe is installed to face the rear of the vehicle.

[0006] In addition, when the exhaust valve of the vehicle's engine opens and exhaust is expelled out of the cylinder, the temperature is about 600°C, the pressure is 3 to 5 atmospheres, and high-frequency sound is generated at a rate of about 3 to 100,000 cycles per second, and as a secondary phenomenon, the gas column in the exhaust pipe and the gas column in the cylinder vibrate, causing very loud noise and making the ride uncomfortable.

[0007] Therefore, a sub-muffler and a main muffler are installed as devices to prevent the generation of excessive noise; these mufflers are typically equipped with heat-resistant sound-absorbing material to dissipate the acoustic energy of the exhaust gas with the lowest possible resistance.

[0008] However, in vehicles equipped with an exhaust pipe of the above-mentioned structure, the combustion performance and catalytic converter operate smoothly because the exhaust pressure is not very high when operating at low speeds, but when operating at high speeds, the exhaust pressure increases, causing the combustion performance to decrease, and there was also a problem in that the durability of the catalytic converter was reduced due to pressure and temperature.

[0009] Thus, an exhaust system for a vehicle engine having a negative pressure valve was disclosed in Public Patent No. 10-1999-0035162 dated May 15, 1999. Looking at its configuration, the exhaust system comprises an exhaust manifold that aggregates exhaust gases from each cylinder, a catalytic converter that blocks harmful gases in the exhaust gas, an exhaust pipe that discharges exhaust gases into the atmosphere, and a sub-muffler and a main muffler that reduce exhaust noise. In this system, a distribution pipe for bypassing exhaust gases is installed between the sub-muffler and the main muffler installed at the end of the exhaust pipe. An exhaust gas distribution valve is installed between the distribution pipe and the main muffler to block the exhaust gas passage leading to the main muffler when the negative pressure of the engine is high and to connect the exhaust gas passage leading to the main muffler when the negative pressure is low. A negative pressure valve pipe for connecting and rotating the exhaust gas distribution valve is installed at the top of the exhaust gas distribution valve and has a connection structure by a spring. The structure is configured such that a negative pressure supply pipe providing negative pressure for opening and closing the negative pressure valve is connected to the throttle valve inlet and the negative pressure valve pipe, so that when the vehicle is at low speed, the exhaust gas distribution valve is opened by spring force and exhaust gas is discharged through the main muffler, and when the vehicle is rotating at high speed, the exhaust gas distribution valve is closed by negative pressure and exhaust gas is discharged through the distribution pipe.

[0010] However, with the exhaust system of a vehicle engine equipped with a conventional negative pressure valve as described above, the external discharge speed of exhaust gas is increased when the vehicle is driven at high speed to maintain combustion performance at high speeds and to ensure the catalytic converter operates smoothly. However, in cases where a worker follows the vehicle while working, such as with a cleaning vehicle, there was a problem in that the worker inevitably contracted occupational diseases such as chronic lung disease by directly inhaling harmful gases emitted directly from the rear of the vehicle regardless of whether the vehicle was in operation. The problem to be solved

[0012] Accordingly, the present invention aims to resolve the conventional problems described above by providing an automatic exhaust gas outlet switching control device and a control method thereof in a vehicle in which exhaust gas outlets are installed at the lower and upper parts of the vehicle, respectively, so that the exhaust gas is discharged through the upper outlet when at low speed, and discharged through the upper outlet and the lower outlet when at high speed or when the diesel particulate filter is operating. means of solving the problem

[0014] The automatic exhaust outlet switching control device in a vehicle according to the present invention for achieving the above objective is,

[0015] A first exhaust pipe having an inlet formed at one end connected to the main exhaust pipe and a lower outlet formed at the other end, and is provided inclined so as to be lowered toward the lower outlet, with a branch pipe formed in this inclined section;

[0016] A second exhaust pipe, one end of which is connected to a branch of the first exhaust pipe and the other end of which has an upper outlet formed at the top of the vehicle; and

[0017] An automatic exhaust gas outlet switching control device in a vehicle comprising: a directional switching valve provided between the lower outlet of a first exhaust pipe and a branch pipe, which allows exhaust gas to be discharged to the lower outlet or the upper outlet as it opens and closes;

[0018] A DC-DC converter that receives power charged in a battery, outputs internal driving power (Vdd) to a microcontroller unit (MCU), and outputs motor driving power;

[0019] An engine key recognition unit that recognizes the state in which the vehicle's engine switch is turned on and the engine is running, and transmits this to the above-mentioned microcontroller unit (MCU);

[0020] A DPF key recognition unit that recognizes the state in which the diesel particulate filter (DPF) is operated to burn and eliminate captured fine dust when the DPF switch is turned on, and transmits this to a microcontroller unit (MCU);

[0021] A C-CAN interface that recognizes the vehicle's status, including the vehicle's driving speed, in real-time via a communication method using C-CAN (C-CAN_H) (C-CAN_L) and transmits it to the above-mentioned microcontroller unit (MCU);

[0022] The valve driving unit is characterized by including: a cylinder that operates and the opening / closing plate rotates to open and close by means of a control signal from a microcontroller unit (MCU) that determines the current state of the vehicle by input through the above-mentioned engine key recognition unit, DPF key recognition unit, and C-CAN interface.

[0023] In addition, it is characterized by further comprising a human body detection sensor installed at the rear of the vehicle and transmitting to the microcontroller unit (MCU) whether a worker is on board the rear of the vehicle.

[0024] The automatic exhaust gas outlet switching control method in a vehicle according to the present invention is,

[0025] A microcontroller unit (MCU) that receives internal driving power (Vdd) from a DC-DC converter charged in the battery recognizes, through the engine key recognition unit, that the vehicle's engine switch is turned off and the engine is stopped, or

[0026] Recognizing the state in which the Diesel Particulate Filter (DPF) is operated to burn and eliminate captured fine dust by turning on the DPF switch through the DPF key recognition unit, or

[0027] If the state in which the vehicle is traveling at a speed of 45 km / h or higher is detected via the C-CAN interface,

[0028] A control signal is output to the valve drive unit to drive the cylinder, thereby maintaining the opening and closing plate of the direction change valve in an open state, so that exhaust gas is discharged into the first exhaust pipe at the bottom of the vehicle and the second exhaust pipe at the top of the vehicle.

[0029] A microcontroller unit (MCU) that receives internal driving power (Vdd) from a DC-DC converter charged in the battery recognizes, through the engine key recognition unit, that the vehicle's engine switch is turned on and the engine is running but the vehicle is in a stationary state, or

[0030] If the state of low-speed driving at a speed of 45 km / h or less is detected via the C-CAN interface,

[0031] It is characterized by outputting a control signal to a valve driving unit to drive a cylinder, thereby maintaining the opening and closing plate of the direction change valve in a closed state, so that the first exhaust pipe at the bottom of the vehicle is closed and exhaust gas is discharged only through the second exhaust pipe at the top of the vehicle.

[0032] In addition, a method for automatically controlling the switching of exhaust gas outlets in a vehicle, characterized in that even when the engine is running and the speed is 45 km / h or less, if the microcontroller unit (MCU) recognizes through a human body detection sensor installed at the rear of the vehicle that a worker is on board the rear of the vehicle, it outputs a control signal to the valve actuator to operate the cylinder, thereby maintaining the opening and closing plate of the direction switching valve in an open state so that exhaust gas is discharged through the upper outlet and the lower outlet. Effects of the invention

[0034] The automatic exhaust outlet switching control device and control method for a vehicle according to the present invention have the effect of not causing harm to the health of a worker by allowing exhaust gas to be discharged through the upper outlet when a worker is working at the rear of the vehicle, and when driving at high speed or operating a diesel particulate filter, exhaust gas is discharged from both the upper outlet and the lower outlet so that back pressure is not applied, thereby preventing damage to the vehicle. Brief explanation of the drawing

[0036] FIG. 1 is a side view illustrating a vehicle equipped with an exhaust device according to the present invention. FIG. 2 is a rear view illustrating a vehicle equipped with an exhaust device according to the present invention. FIG. 3 is a perspective view illustrating the structure of an exhaust device according to the present invention. FIG. 4 is an enlarged view illustrating the structure of the first exhaust pipe of the exhaust device according to the present invention. FIG. 5 is a plan view illustrating the state of discharge through the upper and lower outlets of the exhaust device according to the present invention. FIG. 6 is a plan view illustrating a state in which the exhaust device according to the present invention is discharged only through the upper outlet. FIG. 7 is a block diagram for controlling an exhaust device according to the present invention. FIG. 8 is a diagram illustrating the opening and closing operation state of an opening and closing plate according to the present invention. FIG. 9 is a control block diagram of an exhaust device according to another embodiment of the present invention. Specific details for implementing the invention

[0037] Hereinafter, a preferred embodiment of an automatic exhaust outlet switching control device for a vehicle according to the present invention will be described in detail with reference to the attached drawings.

[0038] FIG. 1 is a side view illustrating a vehicle equipped with an exhaust device according to the present invention, FIG. 2 is a rear view illustrating a vehicle equipped with an exhaust device according to the present invention, FIG. 3 is a perspective view illustrating the structure of the exhaust device according to the present invention, and FIG. 4 is an enlarged view illustrating the structure of the first exhaust pipe of the exhaust device according to the present invention.

[0039] As illustrated in these drawings, the exhaust device according to the present invention comprises: a first exhaust pipe (10) having one end connected to a main exhaust pipe and the other end having a lower outlet (11) formed therein and a branch pipe (12) formed in the middle; a second exhaust pipe (20) having one end connected to the branch pipe (12) of the first exhaust pipe (10) and the other end having an upper outlet (21) formed therein located on the upper part of the vehicle (1); and a direction change valve (40) provided between the lower outlet (11) of the first exhaust pipe (10) and the branch pipe (12) and configured to open and close so that exhaust gas is discharged to the upper outlet (21) or the upper and lower outlets (11, 21).

[0040] The first exhaust pipe (10) is connected to the main exhaust pipe and is formed in an 'L' shape with a portion bent; one end is connected to the main exhaust pipe, and the other end forms a lower outlet (11). Here, instead of the main exhaust pipe, it can be directly connected to a Diesel Particulate Filter (DPF) or a muffler. Additionally, the section where the lower outlet (11) is formed is installed at a slight incline so that the end where the lower outlet (11) is located is lower, and a branch pipe (12) is formed to communicate in a horizontal direction in this section.

[0041] This first exhaust pipe (10) must be firmly connected to the chassis frame and capable of withstanding vibrations sufficiently. Therefore, a multi-stage bent bracket (B) is installed on the first exhaust pipe (10) and the chassis frame, respectively. The bracket (B) installed on the first exhaust pipe (10) is installed at the end of the branch pipe (12) to minimize shaking of the branch pipe (12), thereby preventing gas leakage at the connection point.

[0042] One end of the second exhaust pipe (20) is connected to the branch pipe (12) of the first exhaust pipe (10), and the other end is formed with an upper outlet (21) located on the upper part of the vehicle (1). Since the second exhaust pipe (20), with the upper outlet (21) at the end located on the upper part of the vehicle (1), is exposed to the outside of the vehicle (1), care must be taken to prevent burns caused by heat, so a shielding cover (22) is installed on the exposed surface of the second exhaust pipe (20) to prevent burns.

[0043] A flexible pipe (30) is installed between the branch pipe (12) of the first exhaust pipe (10) and the second exhaust pipe (20) to prevent deformation or damage in the connection section between the first exhaust pipe (10) and the second exhaust pipe (20) due to shaking or vibration of the vehicle (1).

[0044] The above-mentioned direction change valve (40) is installed between the lower outlet (11) and the branch pipe (12) of the first exhaust pipe (10) and, as it opens and closes, allows exhaust gas to be discharged to the lower outlet (11) or the upper outlet (21). That is, an opening / closing plate (41) is installed inside the first exhaust pipe (10), and a rotating shaft (42) is integrally installed in the center thereof so that it rotates by means of the opening / closing plate (41) and the rotating shaft (42). One end of the rotating shaft (42) is exposed to the outside of the first exhaust pipe (10) and connected to a link (43) so that they rotate together. The other end of the link (43) is connected to a cylinder (44) installed in the first exhaust pipe (10), and the opening / closing plate (41) rotates by the protrusion and insertion of the cylinder rod (45), thereby opening and closing the first exhaust pipe (10).

[0045] FIG. 5 is a plan view illustrating a state in which the exhaust device according to the present invention is discharged through the upper and lower outlets, and FIG. 6 is a plan view illustrating a state in which the exhaust device according to the present invention is discharged only through the upper outlet.

[0046] As shown in these drawings, when the first exhaust pipe (10) is opened by the direction change valve (40), exhaust gas is discharged through the upper outlet (21) and the lower outlet (11) as shown in Fig. 5, and when it is closed, exhaust gas is discharged only through the upper outlet (21) through the branch pipe (12) and the second exhaust pipe (20) as shown in Fig. 6. At this time, the amount of discharge can be controlled as the degree of opening and closing varies depending on the angle of the opening / closing plate (41).

[0047] As illustrated in FIG. 7, the configuration for controlling the exhaust device of the present invention comprises: a DC-DC converter (52) that receives power charged in a battery (51) and outputs internal driving power (Vdd) to a micro controller unit (MCU) (50) while outputting motor driving power (VCC); an engine key recognition unit (53) that recognizes the state in which the engine switch (54) of the vehicle (1) is turned on and the engine is operating, and transmits this to the micro controller unit (MCU) (50); and a DPF key recognition unit (55) that recognizes the state in which the DPF switch (56) is turned on and a diesel particulate filter is operated to burn off collected fine dust, and transmits this to the micro controller unit (MCU) (50). It is composed of a C-CAN interface (57) that recognizes the status of the vehicle (1), including the driving speed of the vehicle (1), in real-time via a communication method using a C-CAN (C-CAN_H) (58) (C-CAN_L) (59) and transmits it to the above microcontroller unit (MCU) (50); and a valve driving unit (62) that drives / reverses the cylinder (44) by means of a control signal from the microcontroller unit (MCU) (50) that determines the current status of the vehicle (1) through input via the above engine key recognition unit (53), DPF key recognition unit (55), and C-CAN interface (57), thereby operating the direction change valve (40) by rotating the opening / closing plate (41) forward and reverse by means of the cylinder rod (45).

[0048] The effects of the upper and lower selective exhaust device of the vehicle (1) according to the present invention, which is structured in this way, will be explained in detail with reference to FIGS. 7 and 8.

[0049] First, when operating the vehicle (1) normally, exhaust gas must be naturally discharged, so exhaust gas must be discharged through the lower outlet (11) of the first exhaust pipe (10) and the upper outlet (21) of the second exhaust pipe (20).

[0050] Therefore, the first exhaust pipe (10) is in an open state, that is, the opening / closing plate (41) of the direction change valve (40) is opened and positioned parallel to the axial direction of the first exhaust pipe (10), so that exhaust gas is discharged through the upper outlet (21) and the lower outlet (11).

[0051] That is, in the case where the Micro Controller Unit (MCU) (50), which receives internal driving power (Vdd) from the DC-DC converter (52) that receives power charged in the battery (51), recognizes through the engine key recognition unit (53) that the engine switch (54) of the vehicle (1) is off and the engine is stopped, recognizes through the DPF key recognition unit (55) that the DPF switch (56) is on and the Diesel Particulate Filter is operated to burn off collected fine dust, recognizes through the C-CAN interface (57) that the driving speed of the vehicle (1) is 45 km / h or higher, or when measuring the exhaust gas of the vehicle (1) (since the measurement is taken while mounted on the anatomical device and maintaining a speed of 90 km / h, the same environment), outputs a control signal to the valve driving unit (62) to reverse drive the cylinder (44) or maintain a stopped state while on the cylinder rod (45) By keeping the opening / closing plate (41) of the directional control valve (40) in an open state, exhaust gas is discharged through the lower outlet (11) and the upper outlet (21) as shown in FIG. 5. Since exhaust gas is discharged through the upper and lower outlets (11, 21) in this manner, no back pressure is applied, thereby preventing damage to the engine or the diesel particulate filter.

[0052] On the other hand, when a worker is working at the rear of the vehicle (1), the direction change valve (40) is actuated so that exhaust gas is discharged only through the upper outlet (21).

[0053] That is, when the engine switch (54) of the vehicle (1) is turned on and the engine is running through the engine key recognition unit (53) in the micro controller unit (MCU) (50) which receives internal driving power (Vdd) from the DC-DC converter (52) that receives power charged in the battery (51), or when the driving speed of the vehicle (1) is 45 km / h or less in the C-CAN interface (57), the operator recognizes that the vehicle (1) is working at the rear and outputs a control signal to the valve driving unit (62) to drive the cylinder (44). When the cylinder rod (45) moves in and out, the link (43) rotates, and the rotating shaft (42) integrated with the link (43) rotates, and the opening / closing plate (41) connected thereto also rotates together to close the first exhaust pipe (10).

[0054] And as the first exhaust pipe (10) is closed, the exhaust gas is discharged only through the upper outlet (21) of the second exhaust pipe (20) through the branch pipe (12) as shown in FIG. 6.

[0055] As exhaust gas is also discharged through the upper exhaust port (21) located at the top of the vehicle (1) in this manner, the worker does not inhale the exhaust gas, allowing them to work in a pleasant environment and preventing occupational diseases such as lung disease.

[0056] In addition, when the first exhaust pipe (10) is closed and exhaust gas is discharged through the upper outlet (21), foreign matter may accumulate inside the first exhaust pipe (10), but since all the foreign matter is discharged the moment the first exhaust pipe (10) is opened, there is also an effect of preventing foreign matter from accumulating.

[0058] FIG. 9 is a control block diagram of an exhaust device according to another embodiment of the present invention, wherein a human body detection sensor (60) is installed at the rear of the vehicle (1) as shown in the drawing to transmit to the microcontroller unit (MCU) (50) whether a worker is on board the rear of the vehicle (1).

[0059] That is, even if the engine is running and the speed is 45 km / h or less, if the Micro Controller Unit (MCU) (50) recognizes that a worker is riding in the rear of the vehicle (1) through the human body detection sensor (60) installed at the rear of the vehicle (1), it is not in operation, so a control signal is output to the valve driving unit (62) to drive the cylinder (44) in reverse or maintain a stopped state, and the opening / closing plate (41) of the direction change valve (40) is kept open by the cylinder rod (45), thereby allowing exhaust gas to be discharged through the lower outlet (11). Explanation of the symbols

[0061] 10: First exhaust pipe 11: Lower outlet 12: Branch pipe 20: Second exhaust pipe 21: Upper outlet 40: Directional valve 50: Microcontroller Unit 51: Battery 52 : DC-DC converter 53 : Engine key recognition unit 55 : DPF Key Recognition Unit 57 : C-CAN Interface 60: Human body detection sensor 62: Valve actuator

Claims

Claim 1 A first exhaust pipe (10) having an inlet (13) connected to the main exhaust pipe at one end and a lower outlet (11) at the other end, and provided to be inclined downward toward the lower outlet (11), with a branch pipe (12) formed in this inclined section; a second exhaust pipe (20) having an upper outlet (21) located at the top of the vehicle (1) at one end connected to the branch pipe (12) of the first exhaust pipe (10) and at the other end formed; and a direction change valve (40) provided between the lower outlet (11) of the first exhaust pipe (10) and the branch pipe (12), which allows exhaust gas to be discharged to the upper outlet (21) or the upper and lower outlets (11, 21) as it opens and closes. In an automatic exhaust gas outlet switching control device configured to include: a DC-DC converter (52) that receives power charged in a battery (51) and outputs internal driving power (Vdd) to a microcontroller unit (MCU) (50) while outputting motor driving power (VCC); an engine key recognition unit (53) that recognizes the state in which the engine switch (54) of the vehicle (1) is turned on and the engine is running, and transmits this to the microcontroller unit (MCU) (50); a DPF key recognition unit (55) that recognizes the state in which the diesel particulate filter (DPF) for burning off collected fine dust is operated when the DPF switch (56) is turned on, and transmits this to the microcontroller unit (MCU) (50); and a vehicle (1) that recognizes the state of the vehicle (1), including the driving speed of the vehicle (1), through a real-time CAN (C-CAN_H) (58) (C-CAN_L) (59) communication method and transmits this to the microcontroller unit (MCU) (50). An automatic exhaust gas outlet switching control device in a vehicle, characterized by including: a C-CAN interface (57); a valve driving unit (62) in which a cylinder (44) is operated by a control signal of a microcontroller unit (MCU) (50) that determines the current state of the vehicle (1) by input through the engine key recognition unit (53), DPF key recognition unit (55), and C-CAN interface (57), thereby causing the opening / closing plate (41) to rotate and open / close. Claim 2 An automatic exhaust gas outlet switching control device in a vehicle, characterized by further comprising: a human body detection sensor (60) installed at the rear of the vehicle (1) and transmitting to the microcontroller unit (MCU) (50) whether a worker is on board the rear of the vehicle (1). Claim 3 A first exhaust pipe (10) having an inlet (13) connected to the main exhaust pipe at one end and a lower outlet (11) at the other end, and provided to be inclined downward toward the lower outlet (11), with a branch pipe (12) formed in this inclined section; a second exhaust pipe (20) having an upper outlet (21) formed at one end connected to the branch pipe (12) of the first exhaust pipe (10) and located at the top of the vehicle (1) at the other end; and a direction change valve (40) provided between the lower outlet (11) of the first exhaust pipe (10) and the branch pipe (12), which allows exhaust gas to be discharged to the upper outlet (21) or the upper and lower outlets (11, 21) as it opens and closes.In an automatic exhaust outlet switching control device for a vehicle configured including, when a microcontroller unit (MCU) (50), which receives internal driving power (Vdd) from a DC-DC converter (52) that receives power charged in a battery (51), recognizes through an engine key recognition unit (53) that the engine switch (54) of the vehicle (1) is off and the engine is stopped, recognizes through a DPF key recognition unit (55) that the DPF switch (56) is on and the diesel particulate filter (DPF) for burning off collected fine dust is operated, or recognizes through a C-CAN interface (57) that the driving speed of the vehicle (1) is driving above a set speed, a control signal is output to a valve driving unit (62) to drive a cylinder (44) and maintain the opening / closing plate (41) of the direction change valve (40) in an open state, thereby controlling the first exhaust pipe (10) at the bottom of the vehicle and the second exhaust at the top of the vehicle A method for automatically controlling the exhaust outlet of a vehicle, characterized in that, when exhaust gas is discharged through a pipe (20) and an internal driving power (Vdd) is supplied from a DC-DC converter (52) that receives power charged in a battery (51), the engine switch (54) of the vehicle (1) is turned on through an engine key recognition unit (53) and the engine is running but the vehicle is stopped, or when the driving speed of the vehicle (1) is recognized through a C-CAN interface (57) that the vehicle is driving at a low speed below a set speed, a control signal is output to a valve driving unit (62) to drive a cylinder (44) and maintain the opening / closing plate (41) of the direction change valve (40) in a closed state, thereby closing the first exhaust pipe (10) at the bottom of the vehicle and allowing exhaust gas to be discharged only through the second exhaust pipe (20) at the top of the vehicle. Claim 4 A method for automatically controlling the exhaust gas outlet in a vehicle, characterized in that, in the third claim, when the engine is in a running state and the speed is below a set speed, if the microcontroller unit (MCU) (50) recognizes that a worker is riding in the rear of the vehicle (1) through a human body detection sensor (60) installed at the rear of the vehicle (1), a control signal is output to the valve driving unit (62) to operate the cylinder (44) so ​​that the opening / closing plate (41) of the direction change valve (40) remains open, thereby allowing exhaust gas to be discharged through the lower outlet (11).

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