KR101305190B1 - Urea heating system and heating method thereof - Google Patents

Abstract

The present invention relates to a urea water heating apparatus and method for preventing freezing of urea water using exhaust gas of an engine. More specifically, the present invention relates to a urea water heating apparatus and a method for performing heat exchange between exhaust gas and urea water by bypassing a part of the exhaust gas using a pressure difference between an exhaust gas pipe and a silencer.
Urea water heating apparatus according to an embodiment of the present invention, the exhaust gas pipe for exhausting the high-temperature and high-pressure exhaust gas after engine combustion; A silencer connected to one end of the exhaust gas pipe and reducing the pressure and temperature of the exhaust gas to discharge into the atmosphere; A first bypass pipe branched from the exhaust gas pipe and bypassing some of the exhaust gas; An urea water tank supplied with exhaust gas bypassed to the first bypass pipe and having urea water stored therein; A second bypass pipe having one end connected to the muffler and supplying exhaust gas passing through the urea water tank to the muffler; And a heat exchange tube connecting the first bypass pipe and the second bypass pipe inside the urea water tank and performing heat exchange between urea water and exhaust gas. Including, but a part of the exhaust gas may be bypassed by the pressure difference between the exhaust pipe and the silencer.
The urea water heating method according to an embodiment of the present invention, an exhaust gas pipe for exhaust gas discharged after engine combustion, a muffler connected to the exhaust gas pipe, a urea water tank for storing urea water, branched from the exhaust gas pipe and the urea water In the urea water heating device including a bypass valve connected to the silencer via a tank and a solenoid valve for selectively opening and closing the bypass pipe, determining whether the current rotational speed of the engine is faster than the idle rotational speed of the engine Step (S100); Determining whether a temperature of the urea water is lower than a set temperature by a temperature sensor provided in the urea tank (S110); Determining whether the current rotational speed of the engine is smaller than the maximum rotational speed of the engine (S120); Determining whether the load of the engine is smaller than an allowable value (S130); If all of the determinations of steps S100, S110, S120, and S130 are satisfied, opening the solenoid valve (S150); Closing at least one of the solenoid valves if at least one of the determinations of steps S100, S110, S120, and S130 is not satisfied (S160); And if the step S150 or S160 is performed, performing again from the step S100 (S170); . ≪ / RTI >

Description

Urea water heating device and its method {UREA HEATING SYSTEM AND HEATING METHOD THEREOF}

The present invention relates to a urea water heating apparatus, and more particularly, to a urea water heating apparatus and method for preventing freezing of urea water using the exhaust gas of the engine.

In general, after-treatment of exhaust gas for reducing NOx is applied to diesel engines. Recently, new aftertreatment technologies have been introduced in relation to EURO4 and EURO5 emission regulations. This post-fedging technology is representative of EGR SYSTEM and UREA-SCR SYSTEM as an exhaust gas reduction technology that is of interest not only in Korea but also abroad. In particular, UREA-SCR is the most widely used post-treatment technology to date. In addition, the fuel consumption, the activation temperature, the purification rate, etc. are relatively excellent as the urea water is injected into the exhaust gas to purify only NOX.

Specifically, the UREA-SCR (SELECTIVE CATALYTIC REDUCTION) SYSTEM will be described in more detail. Water is pyrolyzed into NH3 (ammonia) and HNCO (isocyanate) by exhaust gases. In addition, HNCO is decomposed into NH 3 (ammonia) and CO 2 (carbon dioxide) by water in the exhaust gas. The NH 3 thus produced is reacted with NO x by a catalyst and purified into N 2 (nitrogen) and H 2 O (water).

On the other hand, urea (UREA) is frozen at minus 11 degrees Celsius as an aqueous solution of urea, such freezing of urea can cause a fatal defect of the UREA-SCR SYSTEM. Therefore, conventionally, two structures have been proposed as a method for thawing during freezing of urea water.

One of them is urea heating method by coil spring. In this method, when the temperature sensor provided in the urea tank measures the temperature, the ECU supplies power through the relay according to the measured temperature, so that the urea water is heated by heat generated in the coil spring. do. However, this method has a problem in accordance with the installation of the coil spring, there is a problem that must supply a separate power through the relay.

The other is urea water heating by intake air. In this method, when the internal temperature of the urea water tank is lower than the set temperature, the temperature information of the urea water is transmitted to the dosing control unit (DCU) by the temperature sensor provided in the urea water tank. In addition, when information is recognized by the ECU by the CAN communication between the DCU and the engine ECU, the ECU operates the solenoid valve to open the valve. Therefore, the urea water is heated by supplying the hot intake air to the urea water tank along the pipe. Further, when the temperature of the urea water rises above the set temperature, the valve is shut off, and the bypassed suction air is discharged to the atmosphere. However, in this method, since the intake air is compressed by a compressor to raise the temperature, the intake air supplied to the urea water tank is reduced in pressure and temperature by an increased volume. Therefore, considering the efficient aspect and the cost aspect of urea water heating, it is not easy to apply to the actual vehicle.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a urea water heating apparatus and method for urea water can be heated by the high temperature and high pressure exhaust gas discharged after engine combustion. will be.

Urea water heating apparatus according to an embodiment of the present invention for achieving this object is an exhaust gas pipe for exhausting the exhaust gas of high temperature and high pressure after engine combustion; A silencer connected to one end of the exhaust gas pipe and reducing the pressure and temperature of the exhaust gas to discharge into the atmosphere; A first bypass pipe branched from the exhaust gas pipe and bypassing some of the exhaust gas; An urea water tank supplied with exhaust gas bypassed to the first bypass pipe and having urea water stored therein; A second bypass pipe having one end connected to the muffler and supplying exhaust gas passing through the urea water tank to the muffler; And a heat exchange tube connecting the first bypass pipe and the second bypass pipe inside the urea water tank and performing heat exchange between urea water and exhaust gas. Including, but a part of the exhaust gas may be bypassed by the pressure difference between the exhaust pipe and the silencer.

A solenoid valve may be provided on the first bypass pipe to open and close to selectively bypass some of the exhaust gas.

Inside the urea tank may be provided with a temperature sensor for sensing the temperature of the urea water.

And a DCU connected to the solenoid valve and the temperature sensor and selectively opening and closing the solenoid valve by receiving temperature information of the urea water from the temperature sensor.

The inside of the urea tank is provided with a heat dissipation member having a tubular shape at both ends thereof and a porous urea water receiving hole formed at a side thereof, and one of the open ends of the heat dissipation member is combined with the urea tank cap, Can be closed.

The heat exchange tube may be provided inside the heat radiating member.

The heat exchange tube may be formed by bending a tube having a length set to facilitate heat exchange between urea water and exhaust gas.

The heat exchange tube may include one end and the other end, an exhaust gas inlet may be formed at one end, and an exhaust gas outlet may be formed at the other end.

The exhaust gas inlet may be connected to the first bypass pipe through the urea water tank cap, and the exhaust gas outlet may be connected to the second bypass pipe through the urea water tank cap.

The urea water tank cap may have a urea water outlet so that the urea water inside the urea water tank is discharged to the outside.

A urea water pump may be mounted on an inner surface of the heat dissipation member of the urea water tank cap to discharge the urea water inside the urea water tank to the outside through the urea water outlet.

A sealing member may be provided between the inner circumferential surface of the urea water tank cap and the outer circumferential surface of the heat radiating member to prevent leakage of urea water.

One end of the first bypass pipe branched from the exhaust pipe and one end of the second bypass pipe connected to the silencer may be provided with a pressure sensor for measuring the exhaust gas pressure inside the exhaust pipe and the silencer, respectively. have.

The DCU may be connected to the pressure sensors to open the solenoid valve when the exhaust gas pressure in the exhaust gas pipe and the silencer is greater than a set pressure difference.

The urea water heating method according to an embodiment of the present invention, an exhaust gas pipe for exhaust gas discharged after engine combustion, a muffler connected to the exhaust gas pipe, a urea water tank for storing urea water, branched from the exhaust gas pipe and the urea water In the urea water heating device including a bypass valve connected to the silencer via a tank and a solenoid valve for selectively opening and closing the bypass pipe, determining whether the current rotational speed of the engine is faster than the idle rotational speed of the engine Step (S100); Determining whether a temperature of the urea water is lower than a set temperature by a temperature sensor provided in the urea tank (S110); Determining whether the current rotational speed of the engine is smaller than the maximum rotational speed of the engine (S120); Determining whether the load of the engine is smaller than an allowable value (S130); If all of the determinations of steps S100, S110, S120, and S130 are satisfied, opening the solenoid valve (S150); Closing at least one of the solenoid valves if at least one of the determinations of steps S100, S110, S120, and S130 is not satisfied (S160); And if the step S150 or S160 is performed, performing again from the step S100 (S170); . ≪ / RTI >

As described above, according to the embodiment of the present invention, the urea water is heated by the high temperature and high pressure exhaust gas discharged after the engine combustion, so that no separate component such as a heating device or a power supply device is required.

In addition, by controlling the flow of the exhaust gas using the pressure difference between the exhaust pipe and the silencer, a separate component for flowing the exhaust gas through the urea water tank is not required.

Thus, the apparatus and method for heating the urea water can be simplified, and the production cost can be reduced.

1 is a block diagram of a urea water heating apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged view of A of FIG. 1.
3 is a block diagram of a urea water heating apparatus according to another embodiment of the present invention.
4 is a perspective view of a heat exchanger according to an exemplary embodiment of the present invention.
5 is a flowchart of a method for heating urea water according to an embodiment of the present invention.

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

1 is a block diagram of a urea water heating apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the urea water heating apparatus according to an exemplary embodiment of the present invention includes an exhaust gas pipe 10, a silencer 20, a required water tank 50, a heat exchanger 60, and first and second bypasses. Pipes 80 and 82, solenoid valve 30, temperature sensor 70 and DCU 40.

The exhaust gas pipe 10 is a pipe connected to the combustion chamber (not shown) of the engine so that exhaust gas of high temperature and high pressure is discharged from the engine after combustion is performed in the engine (not shown).

The silencer 20 is a device that reduces the pressure and temperature of the exhaust gas and releases it into the atmosphere. In addition, the silencer 20 is connected to one end of the exhaust gas pipe 10. That is, one end of the exhaust gas pipe 10 is connected to the silencer 20, and the other end thereof is connected to the engine to supply the exhaust gas discharged from the combustion chamber of the engine to the silencer 20.

The urea water tank 50 is a tank for storing urea water used for post-treatment of exhaust gas. In addition, the urea water tank 50 may be provided separately from the exhaust gas pipe 10 and the silencer 20.

The heat exchanger 60 is disposed inside the urea water tank 50 to heat-exchange the exhaust gas and the urea water.

The first and second bypass pipes 80 and 82 bypass the portion of the exhaust gas flowing through the exhaust gas pipe 10 to pass the urea water tank 50 to the silencer 20, and then deliver the first and second bypass pipes 80 and 82. The first bypass pipe 80 is branched from one side of the exhaust gas pipe 10 and connected to the heat exchanger 60 disposed in the urea water tank 50. In addition, one end of the second bypass pipe 82 is connected to the heat exchange part 60, and the other end thereof is connected to the silencer 20. That is, when a part of the exhaust gas flowing through the exhaust gas pipe 10 passes through the first bypass pipe 80 and is supplied to the heat exchange part 60, heat exchange between the exhaust gas and urea water is performed in the heat exchange part 60. The heat exchanged exhaust gas passes through the second bypass pipe 82 and is delivered to the muffler 20.

The solenoid valve 30 is a device for selectively opening and closing the first bypass pipe (80). In addition, the solenoid valve 30 is provided on the first bypass pipe 80 between the exhaust gas pipe 10 and the urea water tank 50.

The temperature sensor 70 is a device for measuring the temperature of the urea water stored in the urea water tank 50. In addition, the temperature sensor 70 may be mounted inside the heat exchange part provided in the urea water tank 50. On the other hand, the mounting position of the temperature sensor 70 in the urea water tank 50 may be changed by those skilled in the art (hereinafter, those skilled in the art).

DCU 40 is a dosing control unit. In addition, the DCU 40 is separately provided outside the urea water tank 50 and is connected to the temperature sensor 70 and the solenoid valve 30. Furthermore, the DCU 40 receives the temperature information of the urea water stored in the urea water tank 50 from the temperature sensor 70 to selectively open and close the solenoid valve 30. That is, when the temperature of the urea water is lowered below the set temperature, the solenoid valve 30 is opened, so that exhaust gas of high temperature and high pressure is supplied to the urea water tank 50. On the other hand, the set temperature can be appropriately set by those skilled in the art.

FIG. 2 is an enlarged view of A of FIG. 1. 2 is an enlarged view of a portion where the first bypass pipe 80 branches off from the exhaust gas pipe 10.

As shown in FIG. 2, the urea water heating device according to an exemplary embodiment of the present invention includes a ripple 12 and a ripple through hole 14 at a portion where the first bypass pipe 80 branches from the exhaust gas pipe 10. , The ripple cap 16, the ripple cap through-hole 18 and the corrugated pipe 84 is further included.

The ripple 12 is integrally formed on the side of the exhaust gas pipe 10 so as to couple the exhaust gas pipe 10 and the first bypass pipe 80 to each other. In addition, the ripple 12 is formed to protrude from the side of the exhaust gas pipe (10).

The ripple through hole 14 is formed so that a part of the exhaust gas flowing through the exhaust gas pipe 10 flows into the first bypass pipe 80. That is, the ripple through hole 14 penetrates the side of the ripple 12 and the exhaust gas pipe 10 in the vertical direction of the exhaust gas pipe 10.

The ripple cap 16 is provided at one end of the first bypass pipe 80 to couple the exhaust gas pipe 10 and the first bypass pipe 80 to each other. In addition, the ripple cap 16 is coupled to surround the outer side of the protruding ripple 12. Furthermore, threads may be formed on the outer surface of the ripple 12 and the inner surface of the ripple cap 16 for the coupling. On the other hand, the ripple cap 16 may be formed integrally with or coupled to one end of the first bypass pipe (80).

The ripple cap through hole 18 is formed by penetrating the ripple cap 16 in the vertical direction of the exhaust gas pipe 10 so as to form a passage with the ripple through hole 14. As described above, one end of the first bypass pipe 80 may be integrally formed with or coupled to the ripple cap through-hole 18 to form one passage.

In addition, the same method as the above combination using the components such as the ripple 12 and the ripple cap 16 may also be used in the combination of the silencer 20 and the second bypass pipe 82. Furthermore, the same passage as the ripple through hole 14 and the ripple cap through hole 18 may be formed in the same manner. Meanwhile, although FIG. 2 illustrates the coupling using the ripple 12 and the ripple cap 16, the coupling may be implemented in various ways by those skilled in the art.

The corrugated pipe 84 is formed in a portion of the first bypass pipe 80 to mitigate the shock that may be generated in the first bypass pipe 80 by the vibration of the exhaust gas pipe 10. Meanwhile, although FIG. 2 illustrates that the corrugated pipe 84 is formed as a shock absorber, various methods for mitigating an impact may be performed by those skilled in the art.

3 is a block diagram of a urea water heating apparatus according to another embodiment of the present invention.

In the description of FIG. 3, descriptions of the same elements as those of FIG. 1 described above will be omitted.

As shown in FIG. 3, the urea water heating apparatus according to another embodiment of the present invention further includes first and second pressure sensors 90 and 92.

The first pressure sensor 90 is provided in the first bypass pipe 80. In addition, the first pressure sensor 90 may be provided at a portion where the first bypass pipe 80 branches from the exhaust gas pipe 10 to measure the pressure in the exhaust gas pipe 10.

The second pressure sensor 92 is provided in the second bypass pipe 82. In addition, the second pressure sensor 92 may be provided at a portion where the second bypass pipe 80 is coupled to the silencer 20 to measure the pressure inside the silencer 20.

The first and second pressure sensors 90 and 92 are connected to the DCU 40. In addition, the DCU 40 receives the pressure information in the exhaust gas pipe 10 and the silencer 20 from the first and second pressure sensors 90 and 92 to selectively open and close the solenoid valve 30. That is, when the pressure difference in the exhaust gas pipe 10 and the silencer 20 becomes more than a predetermined value, the solenoid valve 30 is opened, and the high-temperature and high-pressure exhaust gas is supplied to the urea water tank 50. On the other hand, the set value of the pressure difference can be appropriately set by those skilled in the art.

Therefore, in another embodiment of the present invention shown in FIG. 3, the solenoid valve 30 is opened when the information on the temperature of the urea water and the pressure of the exhaust gas is collected to satisfy the set temperature or the set pressure difference. Let's do it. In addition, in the embodiment shown in FIGS. 1 and 3, the pressure inside the exhaust gas pipe 10 is relatively higher than the pressure inside the silencer 20. That is, when the solenoid valve 30 is opened, a part of the exhaust gas flowing through the exhaust gas pipe 10 naturally passes through the first bypass pipe 80, the heat exchanger 60, and the second bypass pipe 82 sequentially. It is transmitted to the silencer 20 via.

4 is a perspective view of a heat exchanger according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the heat exchange part 60 includes a heat dissipation member 62, a urea water tank cap 102, a heat exchange tube 110, an exhaust gas inlet 112, an exhaust gas outlet 114, and urea water. Outlet 104 and urea water pump 100 is included.

The heat dissipation member 62 is an apparatus for increasing the heat exchange efficiency of the exhaust gas and the urea water by suppressing the heat inside thereof from being released to the outside thereof. In addition, the heat radiating member 62 is formed in the tubular shape whose both ends opened. Further, in the heat dissipation member 62, a porous urea water accommodating hole 64 penetrating the side surface of the heat dissipation member 62 is formed to accommodate the urea water as the heat exchanger 60.

Urea water tank cap 102 may be a lid of the urea water tank (50). In addition, the urea water tank cap 102 is coupled to the heat dissipation member 62 in a shape that covers one of the open ends of the heat dissipation member 62. That is, one of the open both ends of the heat dissipation member 62 is closed by the urea tank cap 102. Here, the heat dissipation member 62 may be a hollow cylindrical shape of which both ends are opened, and the urea water tank cap 102 may be a hollow cylindrical shape of which one end is closed. In addition, a sealing member 106 is provided between the inner circumferential surface of the urea water tank cap 102 and the outer circumferential surface of the heat dissipation member 62 to prevent leakage of urea water.

The heat exchange tube 110 is provided in the inner space of the heat dissipation member 62 surrounded by the heat dissipation member 62 and the urea water tank cap 102. In addition, the heat exchange tube 110 has a set length such that heat exchange between urea water and exhaust gas can be sufficiently performed. Furthermore, the heat exchange tube 110 having the set length is bent several times to be provided in the limited internal space of the heat dissipation member 62.

On the other hand, the heat exchange tube 110 includes one end and the other end. In addition, the one end is connected to the first bypass pipe 80, the other end is connected to the second bypass pipe 82, the first bypass pipe 80, the heat exchange pipe 110 and the second bypass The pass pipe 82 constitutes one passage.

The exhaust gas inlet 112 is integrally formed at the one end of the heat exchange tube 110. In addition, the one end penetrates the urea water tank cap 102 and protrudes out of the urea water tank 50. Further, the exhaust gas inlet 112 protruding out of the urea water tank 50 is connected to the first bypass pipe 80.

The exhaust gas outlet 114 is integrally formed at the other end of the heat exchange tube 110. In addition, the other end penetrates through the urea water tank cap 102 and protrudes out of the urea water tank 50. Further, the exhaust gas outlet 114 protruding out of the urea water tank 50 is connected to the second bypass pipe 82. That is, a part of the exhaust gas flowing through the exhaust gas pipe 10 is delivered to the silencer via the first bypass pipe 80, the heat exchange pipe 110, and the second bypass pipe 82 in sequence.

The urea water outlet 104 is formed to protrude from the outer surface of the urea water tank cap 102 to discharge the urea water in the urea water tank 50 to the outside. Here, the discharged urea water can be used for post treatment of exhaust gas. On the other hand, since the use of urea water for the post-treatment of the exhaust gas can be easily performed by those skilled in the art, further description will be omitted.

The urea water pump 100 is a device for pumping urea water and discharging it to the outside of the urea water tank 50. In addition, the urea water pump 100 is mounted on the inner surface of the urea water tank cap 102 to discharge the urea water through the urea water outlet 104.

Hereinafter, with reference to Figure 5, the urea water heating method according to an embodiment of the present invention will be described in detail.

5 is a flowchart of a method for heating urea water according to an embodiment of the present invention.

As shown in FIG. 5, when an engine (not shown) is started (S100), the DCU 40 determines whether the rotation speed of the engine is faster than the idle rotation speed of the engine (S110).

If it is determined in step S110 that the rotation speed of the engine is faster than the idle rotation speed, the DCU 40 receives the temperature information of the urea water from the temperature sensor 70 provided in the urea tank 50 It is determined whether the temperature of the water is lower than the set temperature (S120).

If it is determined in step S110 that the rotational speed of the engine is not faster than the idle rotational speed, the DCU 40 closes the solenoid valve 30 (S160).

If it is determined in step S120 that the temperature of the urea water is lower than the set temperature, the DCU 40 determines whether the current rotation speed of the engine is smaller than the maximum rotation speed of the engine (S130).

If it is determined in step S120 that the temperature of the urea water is not lower than the set temperature, the DCU 40 closes the solenoid valve 30 (S160).

If it is determined in step S130 that the current rotational speed of the engine is smaller than the maximum rotational speed, the DCU 40 determines whether the load of the engine is smaller than the allowable value (S140).

If it is determined in step S130 that the current rotation speed of the engine is not smaller than the maximum rotation speed, the DCU 40 closes the solenoid valve 30 (S160).

If it is determined in step S140 that the load of the engine is smaller than the allowable value, the DCU 40 opens the solenoid valve 30 (S150). That is, when all of the determination of the steps S100, S110, S120 and S130 is satisfied, the solenoid valve 30 is opened (S150).

If it is determined in step S140 that the load of the engine is not smaller than the allowable value, the DCU 40 closes the solenoid valve 30 (S160). That is, if at least one of the determinations in steps S100, S110, S120 and S130 is not satisfied, the solenoid valve 30 is closed (S160).

When the step S150 or S160 is performed, it is performed again from the step S100 by the DCU 40 and the respective sensors (S170).

In this case, the information about the engine is detected by the ECU (not shown), and the steps S110, S130, and S140 may be performed by the DCU 40 receiving the engine information from the ECU.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: exhaust gas pipe 12: ripple
14: Ripple through hole 16: Ripple cap
18: Ripple cap through hole 20: Silencer
30: solenoid valve 40: DCU (dosing control unit)
50: urea water tank 60: heat exchange unit
62: heat dissipation member 64: urea water accommodating hole
70: temperature sensor 80: first bypass pipe
82: second bypass pipe 84: corrugated pipe
90: first pressure sensor 92: second pressure sensor
100: urea water pump 102: urea water tank cap
104: urea water outlet 106: sealing member
110: heat exchange tube 112: exhaust gas inlet
114: exhaust gas outlet

Claims (15)

An exhaust gas pipe through which the exhaust gas of high temperature and high pressure is exhausted after engine combustion;
A silencer connected to one end of the exhaust gas pipe and reducing the pressure and temperature of the exhaust gas to discharge into the atmosphere;
A first bypass pipe branched from the exhaust gas pipe and bypassing some of the exhaust gas;
An urea water tank supplied with exhaust gas bypassed to the first bypass pipe and having urea water stored therein;
A second bypass pipe having one end connected to the muffler and supplying exhaust gas passing through the urea water tank to the muffler; And
A heat exchange tube connected to the first bypass pipe and the second bypass pipe inside the urea water tank and configured to perform heat exchange between urea water and exhaust gas;
Including,
Urea water heating apparatus in which a part of the exhaust gas is bypassed by the pressure difference between the exhaust pipe and the silencer. The method of claim 1,
The urea water heating apparatus is provided with a solenoid valve that is opened and closed to selectively bypass some of the exhaust gas on the first bypass pipe. The method of claim 2,
The urea water heating apparatus, characterized in that the inside of the urea water tank is provided with a temperature sensor for sensing the temperature of the urea water. The method of claim 3,
And a dosing control unit (DCU) connected to the solenoid valve and the temperature sensor to selectively open and close the solenoid valve by receiving temperature information of the urea water from the temperature sensor. Male heating device. The method of claim 1,
The inside of the urea tank is provided with a heat dissipation member having both ends of the tubular shape and a urea water receiving hole formed in the side thereof,
One of the open both ends of the heat dissipation member is combined with the urea water tank cap, it is closed urea water heating apparatus. The method of claim 5,
The heat exchange tube is a urea water heating apparatus, characterized in that provided on the inside of the heat radiating member. The method according to claim 6,
The heat exchange tube is a urea water heating apparatus characterized in that the tube of a length set to facilitate heat exchange between urea water and exhaust gas is bent several times. The method according to claim 6,
The heat exchange tube includes one end and the other end,
An exhaust gas inlet is formed at one end, and an exhaust gas outlet is formed at the other end. 9. The method of claim 8,
The exhaust gas inlet is connected to the first bypass pipe through the urea water tank cap,
The exhaust gas discharge port is urea water heating apparatus characterized in that it is connected to the second bypass pipe through the urea water tank cap. The method of claim 5,
The urea water heating device is characterized in that the urea water outlet is formed in the urea water tank cap to discharge the urea water in the urea water tank to the outside. The method of claim 10,
A urea water pump is mounted on an inner surface of the heat dissipation member of the urea water tank cap to discharge urea water in the urea water tank to the outside through the urea water outlet. The method of claim 5,
Urea water heating device characterized in that the sealing member is provided between the inner circumferential surface of the urea water tank cap and the outer circumferential surface of the heat dissipation member to prevent leakage of urea water. 5. The method of claim 4,
One end of the first bypass pipe branched from the exhaust pipe and one end of the second bypass pipe connected to the silencer are provided with a pressure sensor for measuring the exhaust gas pressure inside the exhaust pipe and the silencer, respectively. Urea heating device characterized in that. The method of claim 13,
The DCU is connected to the pressure sensors,
And the solenoid valve is opened when the exhaust gas pressure in the exhaust gas pipe and the silencer is equal to or greater than a set pressure difference. An exhaust gas pipe from which exhaust gas is discharged after engine combustion, a silencer connected to the exhaust gas pipe, a urea water tank storing urea water, a bi-bath pipe branched from the exhaust gas pipe and connected to the silencer via the urea water tank; In the urea water heating device comprising a solenoid valve for selectively opening and closing the bypass pipe,
Determining whether the current rotation speed of the engine is faster than the idle rotation speed of the engine (S100);
Determining whether a temperature of the urea water is lower than a set temperature by a temperature sensor provided in the urea tank (S110);
Determining whether the current rotational speed of the engine is smaller than the maximum rotational speed of the engine (S120);
Determining whether the load of the engine is smaller than an allowable value (S130);
If all of the determinations of steps S100, S110, S120, and S130 are satisfied, opening the solenoid valve (S150);
Closing at least one of the solenoid valves if at least one of the determinations of steps S100, S110, S120, and S130 is not satisfied (S160); And
If the step S150 or S160 is performed, performing the step from the step S100 again (S170);
Element number heating method comprising a.

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