KR102663149B1 - Cooling system for dosing module and cooling method for dosing module using the same - Google Patents

Abstract

A dosing module cooling system that cools the dosing module by supplying flow to the exhaust side of the vehicle using an E-booster and a dosing module cooling method using the same are provided.
The cooling system for the dosing module according to an embodiment of the present invention is a dosing module for a vehicle including an engine, an exhaust gas passage, and a dosing module that injects urea water into the exhaust gas passage and is disposed adjacent to the exhaust gas passage. A cooling system for a module, which is connected to an air flow rate forming unit and the exhaust gas flow path and the air flow rate forming unit so that air at a predetermined flow rate is supplied to the exhaust gas flow path when the vehicle's engine is turned off, and the predetermined flow rate is a cooling system of the module. It is characterized in that it includes an EGR unit having a first exhaust gas circulation unit that circulates air through the engine and supplies it to the exhaust gas flow path.

Description

Dosing module cooling system and dosing module cooling method using the same {COOLING SYSTEM FOR DOSING MODULE AND COOLING METHOD FOR DOSING MODULE USING THE SAME}

The present invention relates to a cooling system for a dosing module and a method for cooling a dosing module using the same. In particular, it relates to a cooling system for a dosing module that cools the dosing module using an E-booster and a method for cooling the dosing module using the same. .

Diesel vehicles are equipped with various types of after-treatment devices to remove harmful substances such as NOx, CO, THC, and PM (Particulate Matters) generated during the engine combustion process.

The post-processing device is located close to the engine and is equipped with a Diesel Oxidation Catalyst (DOC) that oxidizes and purifies THC and CO, a Diesel Particulate Filter (DPF) containing particulate matter, and ammonia (NH3). It includes a Selective Catalytic Reduction (SCR) catalyst that purifies NOx through reduction.

The SCR catalyst uses ammonia (NH3) as a reducing agent to purify NOx, and has excellent selectivity for NOx.

To purify NOx, the SCR catalyst injects urea into a dosing module placed in front of the SCR catalyst, and acquires ammonia generated through evaporation and decomposition of the injected urea.

In order to cool the conventional dosing module, the cooling medium supply unit (e.g. water pump) is continuously driven in the post-run phase when the engine is off and the ignition is off to supply the cooling medium (e.g. : Coolant) is circulated.

At this time, there is a limit to the cooling efficiency of the radiator to facilitate cooling of the cooling medium only by circulating the cooling medium while the vehicle is stationary.

In addition, in the case of the lower floor of the vehicle where the dosing module is installed, there are many obstacles to smooth cooling of the dosing module due to factors such as radiant heat from the ground as well as air circulation.

Public Patent Publication No. 10-2018-0068199

The present invention was developed to solve the above-mentioned problems, and provides a dosing module cooling system that cools the dosing module by supplying flow to the exhaust side of the vehicle using an E-booster, and a dosing module cooling method using the same. There is a purpose.

The cooling system for the dosing module according to an embodiment of the present invention is a dosing module for a vehicle including an engine, an exhaust gas passage, and a dosing module that injects urea water into the exhaust gas passage and is disposed adjacent to the exhaust gas passage. A cooling system for a module, which is connected to an air flow rate forming unit and the exhaust gas flow path and the air flow rate forming unit so that air at a predetermined flow rate is supplied to the exhaust gas flow path when the vehicle's engine is turned off, and the predetermined flow rate is a cooling system of the module. It is characterized in that it includes an EGR unit having a first exhaust gas circulation unit that circulates air through the engine and supplies it to the exhaust gas flow path.

Preferably, the first exhaust gas circulation part is formed on a first flow path through which the air of the predetermined flow rate flows and the first flow path, and distributes the air of the predetermined flow rate between the air flow rate forming part and the exhaust gas flow path. Characterized in that it includes a first valve that controls flow.

Preferably, the first valve is provided between an intake side of the engine and an exhaust side of the engine.

Preferably, when the first valve is opened, the air at the predetermined flow rate is supplied to the exhaust gas flow path through the first flow path, and when the first valve is closed, the air at the predetermined flow rate forms the air flow rate. It is characterized by flowing in the negative direction.

Preferably, the first exhaust gas circulation unit is provided on the first flow path between the first valve and the exhaust side of the engine, and is configured to cool the air of the predetermined flow rate supplied through the first flow path. It may further include a bypass valve formed on the cooler and the first flow path and connected to a rear side of the inlet portion of the first cooler and a front side of the outlet portion of the first cooler.

Preferably, it further includes a DPF provided between the exhaust gas flow path and the first exhaust gas circulation unit.

Preferably, it further includes a cooling medium supply unit that supplies cooling medium to the dosing module, and a cooling control device that controls the operation of the cooling medium supply unit according to the operation of the air flow rate forming unit.

Preferably, the cooling control device includes a target driving time setting unit that sets a second target driving time of the cooling medium supply unit that is shorter than the first target driving time of the cooling medium supply unit when the vehicle is started off; an air flow rate controller that controls the air flow rate forming unit so that a predetermined flow rate of air is supplied to the exhaust gas flow path according to a set second target driving time, and an air flow rate controller that controls the second target driving time according to the supplied predetermined flow rate of air. It is characterized by including a driving time setting unit that sets the driving time of the cooling medium supply unit.

Preferably, the cooling control device further includes an ignition On/Off determination unit that determines an On/Off state of the vehicle ignition.

Preferably, the target driving time setting unit sets the second target driving time when the first target driving time is greater than or equal to a certain value.

Preferably, the cooling control device includes a temperature determination unit that determines whether the temperature of the exhaust gas flow path according to the supplied predetermined flow rate of air is below a certain temperature, and a temperature determination unit that determines whether the temperature of the exhaust gas flow path is below a certain temperature, and the set It further includes a cooling medium supply control unit that controls the operation of the cooling medium supply unit according to the operation time of the cooling medium supply unit.

Preferably, the air flow rate controller controls the operation of the air flow rate forming unit to stop when the temperature of the exhaust gas flow path is below a certain temperature.

Preferably, the air flow rate controller controls the air flow rate forming section to continue operating when the temperature of the exhaust gas flow path is above a certain temperature.

Preferably, the cooling medium supply control unit controls the operation of the cooling medium supply unit to be stopped when the cooling medium supply unit is driven for the set driving time of the cooling medium supply unit.

A method of cooling a dosing module according to an embodiment of the present invention is a method of cooling a dosing module of a vehicle, wherein the vehicle sprays urea water into an engine, an exhaust gas passage, and the exhaust gas passage and flows into the exhaust gas passage. It includes a dosing module disposed adjacent to the dosing module, a cooling medium supply part that supplies a cooling medium to the dosing module, and an air flow rate forming part that supplies a predetermined flow rate of air to the exhaust gas flow path, and when the vehicle's engine is turned off, The method includes supplying a predetermined flow rate of air to the exhaust gas flow path by driving the air flow rate forming unit, and controlling operation of the cooling medium supply unit according to driving of the air flow rate forming part.

Preferably, the method further includes determining the On/Off state of the vehicle ignition.

Preferably, the step of supplying air at a predetermined flow rate includes setting a second target driving time of the cooling medium supply unit that is shorter than the first target driving time of the cooling medium supply unit when the vehicle is started, and and controlling the air flow rate forming unit so that a predetermined flow rate of air is supplied to the exhaust gas flow path according to the set second target driving time.

Preferably, the step of supplying air at a predetermined flow rate further includes determining whether the temperature of the exhaust gas flow path according to the supplied air at a predetermined flow rate is less than a certain temperature.

Preferably, in the step of setting the second target driving time, if the first target driving time is greater than a certain value, the second target driving time is set.

Preferably, the step of supplying air at a predetermined flow rate further includes controlling the operation of the air flow rate forming unit to be stopped when the temperature of the exhaust gas flow path is determined to be below a certain temperature. .

Preferably, the step of supplying air at a predetermined flow rate further includes controlling the air flow rate forming unit to continue operating when it is determined that the temperature of the exhaust gas flow path is above a certain temperature.

Preferably, the step of controlling the driving of the cooling medium supply unit further includes setting the second target driving time as the driving time of the cooling medium supply unit according to the supplied air flow rate. Do it as

Preferably, the step of controlling the operation of the cooling medium supply unit includes controlling the operation of the cooling medium supply unit according to the set operation time of the cooling medium supply unit while the temperature of the exhaust gas flow path is below a certain temperature. It is characterized in that it further includes.

Preferably, controlling the operation of the cooling medium supply unit further includes controlling the operation of the cooling medium supply unit to be stopped when the cooling medium supply unit is driven for the set driving time of the cooling medium supply unit. It is characterized by:

According to the cooling system of the dosing module of the present invention, the operation of the air flow rate forming unit is controlled to supply air at a predetermined flow rate to the exhaust gas flow path, so that the exhaust gas flow path can be cooled by the artificial air flow formed when the engine is turned off.

Accordingly, the target operation time of the cooling medium supply unit for cooling the dosing module can be shortened by suppressing the temperature rise of the dosing module disposed adjacent to the exhaust gas flow path.

1 is a diagram showing an embodiment of a cooling system for a dosing module and a cooling control device for the dosing module of the present invention.
Figure 2 is a diagram showing another embodiment of the cooling system of the dosing module and the cooling control device of the dosing module of the present invention.
Figure 3 is a diagram showing the target operation time reduction of the cooling medium supply unit according to the control of the air flow control unit.
Figure 4 is a flowchart showing a method of cooling a dosing module according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or restricted thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

Figure 1 is a diagram showing an embodiment of the cooling system 1 of the dosing module and the cooling control device 100 of the dosing module of the present invention.

Referring to Figure 1, the cooling system 1 of the dosing module includes a dosing module 2, a cooling medium supply unit 3, an air flow forming unit 4, an EGR unit 5, and an engine 6, such as a diesel engine. ), DPF (7), exhaust gas flow path (R), and cooling control device (100).

The dosing module 2 sprays urea water into the exhaust gas flow path (R) and may be placed adjacent to the exhaust gas flow path (R). Additionally, an SCR catalyst may be disposed on the outlet side of the exhaust gas flow path (R).

The cooling medium supply unit 3 may supply a cooling medium (eg, cooling water) to the dosing module 2 for cooling the dosing module 2. As an example, the cooling medium supply unit 3 may be an Electric Water Pump (EWP).

The air flow rate forming unit 4 can supply air at a predetermined flow rate to the exhaust gas flow path R when the engine 6 is in an Off state and the vehicle is started. At this time, the air at the predetermined flow rate may be air with a different component from the exhaust gas (e.g., fresh air), or may be air for cooling the exhaust gas flow path R.

As an example, the air flow rate forming unit 4 may be an E-Booster that performs intake supercharging through the application of power, unlike the turbocharger 52 (turbocharger), which will be described later.

Meanwhile, in the embodiment shown in FIG. 1, the air flow rate forming unit 4 may be provided separately from the turbocharger 52.

As shown in FIG. 1, the EGR unit 5 is connected to the exhaust gas flow path R and the air flow rate forming part 4, and circulates air at a predetermined flow rate through the engine 6 to form the exhaust gas flow path R. It includes a first exhaust gas circulation unit 51 that supplies to. As an example, the first exhaust gas circulation unit 51 may be a high-pressure exhaust gas circulation device (HP-EGR) that recirculates high-pressure exhaust gas.

The first exhaust gas circulation unit 51 is formed on the first flow path 51a and the first flow path 51a through which air of a predetermined flow rate formed from the air flow rate forming portion 4 flows, and the air flow rate forming portion 4 ) and a first valve (51b) that controls the flow of air at a predetermined flow rate formed from the air flow rate forming portion (4) between the exhaust gas flow path (R). As an example, the first flow path 51a may be an HP-EGR flow path, and the first valve 51b may be an HP-EGR valve.

At this time, the first valve 51b may be provided between the intake side (eg, intake manifold) of the engine 6 and the exhaust side (eg, exhaust manifold) of the engine 6. Additionally, one side and the other side of the first flow path 51a may be connected to the intake side of the engine 6 and the exhaust side of the engine 6, respectively.

When the first valve 51b is opened, the air at a predetermined flow rate supplied from the air flow forming unit 4 is supplied to the exhaust gas flow path R through the first flow path 51a, and the first valve 51b is When the first valve (51b) is closed while it is open and a predetermined flow rate of air flows through the first flow path (51a), the predetermined flow rate supplied from the air flow rate forming unit (4) The air may again flow in the direction of the air flow forming portion 4.

In this way, when the first valve 51b is closed and the air at a predetermined flow rate flows again in the direction of the air flow rate forming unit 4, the air flows through the first exhaust gas circulation unit 51 according to the flow force of the air at the predetermined flow rate. Substances (eg, soot, etc.) deposited on the first valve 51b due to the circulation of exhaust gas can be easily removed from the first valve 51b. Accordingly, the durability of the first valve 51b of the first exhaust gas circulation unit 51 can be improved when the vehicle ignition is off.

The first exhaust gas circulation unit 51 is provided between the first valve 51b and the exhaust side of the engine 6 on the first flow path 51a, and distributes a predetermined flow rate supplied through the first flow path 51a. A first cooler 51c for cooling the air and a bypass valve 51d formed on a separate flow path connected to the rear of the inlet part of the first cooler 51c and the front of the outlet part of the first cooler 51c It further includes. As an example, the first cooler 51c may be an HP-EGR cooler.

When the bypass valve 51d is opened, some of the air with a predetermined flow rate supplied through the air flow forming unit 4 does not pass through the first cooler 51c through the above-mentioned separate flow path and enters the exhaust gas flow path (R). ) may flow in the direction.

In addition, similar to the above-described first valve 51b, the bypass valve 51d is closed with a predetermined flow rate of air flowing through the first flow path 51a, and bypasses according to the flow force of the predetermined flow rate of air. Substances deposited on the pass valve 51d can be easily removed from the bypass valve 51d.

Referring to FIG. 1, the EGR unit 5 is provided between the exhaust side of the engine 6 and the exhaust gas flow path (R) and supercharges the exhaust gas. It includes an intercooler (53) that cools the exhaust gas.

At this time, the turbocharger 52 may include a turbine and a compressor, and the intercooler 53 may be connected to the compressor portion of the turbocharger 52. In addition, a predetermined flow rate of air supplied through the air flow rate forming unit 4 flowing through the first flow path 51a of the first exhaust gas circulation unit 51 and the exhaust side of the engine 6 is supplied to the turbocharger ( It may flow in the direction of the exhaust gas flow path (R) through the turbine of 52).

Referring to FIG. 1, the EGR unit 5 further includes a second exhaust gas circulation unit 54. As an example, the second exhaust gas circulation unit 54 may be a low-pressure exhaust gas circulation device (LP-EGR) that recirculates low-pressure exhaust gas.

At this time, while the exhaust gas flowing into the first exhaust gas circulation unit 51 through the passage where the throttle valve 55 is arranged passes through the compressor of the turbocharger 52, the second exhaust gas circulation unit ( In 54), the exhaust gas flowing in through the passage where the throttle valve 55 is disposed may be branched before passing through the compressor of the turbocharger 52 and flow into the exhaust gas passage R.

In detail, the second exhaust gas circulation unit 54 has a second flow path (54a) connected to the flow path where the throttle valve 55 is arranged, and a space between the flow path where the throttle valve 55 is arranged and the second flow path (54a). A second valve (54b) is provided to control the flow of exhaust gas to the exhaust gas flow path (R) according to opening or closing, and between the second valve (54b) and the exhaust gas flow path (R) on the second flow path (54a). It is provided in and includes a second cooler (54c) that cools the exhaust gas flowing in through the second flow path (54a). As an example, the second flow path 54a may be an LP-EGR flow path, the second valve 54b may be an LP-EGR valve, and the second cooler 54c may be an LP-EGR cooler.

The DPF (7) is a diesel particulate filter and may be provided between the exhaust gas flow path (R) and the first exhaust gas circulation unit (51). In detail, a predetermined flow rate of air flowing through the turbine of the turbocharger 52 may be introduced into the DPF 7.

Figure 2 is a diagram showing another embodiment of the cooling system 1 of the dosing module and the cooling control device 100 of the dosing module of the present invention.

In the case of the cooling system 1 of the dosing module shown in FIG. 2, the remaining configuration is the same as the dosing shown in FIG. 1, except that the air flow forming portion 4 is provided on the turbine side of the turbocharger 52. Same as the module's cooling system (1).

In this case, the air flow rate forming unit 4 can form air at a predetermined flow rate on the turbine side of the turbocharger 52 and supply it to the exhaust gas flow path R.

FIG. 3 is a diagram showing the target operation time reduction of the cooling medium supply unit 3 according to the control of the air flow rate controller 30.

Referring to Figures 1 and 2, the cooling control device 100 of the dosing module according to an embodiment of the present invention includes an ignition On/Off determination unit 10, a target driving time setting unit 20, and an air flow rate control unit. (30), including a temperature determination unit 40, a drive time setting unit 50, and a cooling medium supply control unit 60. As an example, the cooling control device 100 may include an engine control unit (ECU) and a dosing module control unit, and the cooling medium is generated according to the driving of the air flow rate forming unit 4. The operation of the supply unit 3 can be controlled.

Referring to FIGS. 1 to 3 , the ignition On/Off determination unit 10 may determine the On/Off state of the vehicle ignition. As an example, the ignition On/Off determination unit 10 may determine whether the vehicle ignition is Off (Post-run state) when the engine 6 is Off.

The target driving time setting unit 20 may set a second target driving time of the cooling medium supply unit 3 that is shorter than the first target driving time of the cooling medium supply unit 3 when the vehicle is started off.

At this time, the first target operation time means the time during which the cooling medium supply unit 3 must be driven to cool the dosing module 2 in a state in which the air flow rate forming unit 4 is not operating.

In addition, the second target driving time is shorter than the first target driving time as the exhaust gas flow path R in which the dosing module 2 is disposed adjacent to the dosing module 2 is cooled by the operation of the air flow forming unit 4. It means the time during which the cooling medium supply unit (3) must be driven for cooling (2).

The target driving time setting unit 20 may set the second target driving time when the first target driving time is greater than or equal to a certain value. At this time, the constant value may be determined in advance through the cooling control device 100.

The air flow rate controller 30 may control the air flow rate forming section 4 so that a predetermined flow rate of air is supplied to the exhaust gas flow path R according to the set second target driving time.

When the air flow rate forming unit 4 is operated, the air flow control unit 30 causes the first valve 51b of the above-described first exhaust gas circulation part 51 to open so that air flows through the air flow forming part 4. The formed air at a predetermined flow rate can be allowed to flow into the exhaust gas flow path (R). At this time, air at a predetermined flow rate may be cooled through the first cooler 51c.

Additionally, the air flow controller 30 may control the bypass valve 51d of the first exhaust gas circulation unit 51 to be opened simultaneously with the first valve 51b.

The temperature determination unit 40 may determine whether the temperature of the exhaust gas flow path R according to the predetermined flow rate of air supplied through the air flow rate forming unit 4 is less than a certain temperature. As an example, the exhaust gas flow path (R) may be equipped with a separate temperature detection sensor (not shown), and the temperature determination unit 40 may determine whether the exhaust gas flow path (R) is cooled through the temperature detection sensor. there is.

When the temperature of the exhaust gas flow path R determined through the temperature determination unit 40 is below a certain temperature, the air flow control unit 30 adjusts the driving time of the cooling medium supply unit 3 according to the set second target driving time. It is determined that the exhaust gas flow path (R) has been sufficiently cooled to shorten the length, and the operation of the air flow rate forming unit (4) can be controlled to stop. At this time, the first valve 51b of the first exhaust gas circulation unit 51 may also be closed.

Meanwhile, when the temperature of the exhaust gas flow path (R) is above a certain temperature, the air flow control unit 30 controls the exhaust gas flow path (R) enough to shorten the driving time of the cooling medium supply unit 3 according to the set second target driving time. It may be determined that R) is not sufficiently cooled and the air flow rate forming unit 4 may be controlled to continue operating.

The driving time setting unit 50 operates when the temperature of the exhaust gas flow path R determined through the temperature determination unit 40 is below a certain temperature according to the predetermined flow rate of air supplied through the air flow rate forming unit 4. 2 The target driving time can be set to the driving time of the cooling medium supply unit (3).

This is because the exhaust gas flow path (R) disposed adjacent to the dosing module (2) is cooled as the air flow forming unit (4) is driven, thereby suppressing the temperature rise of the dosing module (2), thereby cooling the dosing module (2). This means that the time during which the cooling medium supply unit 3 must be driven is reduced compared to the state in which the air flow rate forming unit 4 is not in operation.

The cooling medium supply control unit 60 may control the operation of the cooling medium supply unit 3 according to a set operation time of the cooling medium supply unit 3 when the temperature of the exhaust gas flow path R is below a certain temperature.

At this time, the cooling medium supply control unit 60 may control the operation of the cooling medium supply unit 3 to be stopped when the cooling medium supply unit 3 is driven for the set driving time of the cooling medium supply unit 3.

According to the cooling system 1 of the dosing module of the present invention, the operation of the air flow rate forming unit 4 is controlled to supply air at a predetermined flow rate to the exhaust gas flow path R, thereby preventing the artificial air flow formed when the engine is turned off. The exhaust gas flow path (R) can be cooled.

Accordingly, the target operation time of the cooling medium supply unit 3 for cooling the dosing module 2 can be shortened by suppressing the temperature rise of the dosing module 2 disposed adjacent to the exhaust gas flow path R.

Figure 4 is a flowchart showing a method of cooling the dosing module 2 according to an embodiment of the present invention.

The cooling method of the dosing module 2 shown in FIG. 4 can be performed through the cooling control device 100 described above.

The method of cooling the dosing module 2 includes supplying a predetermined flow rate of air to the exhaust gas flow path R by driving the air flow rate forming unit 4 when the vehicle's engine is turned off, and the air flow rate forming part 4 ) and controlling the operation of the cooling medium supply unit 3 according to the operation of the cooling medium supply unit 3.

In detail, the method of cooling the dosing module 2 includes first determining the On/Off state of the vehicle ignition (step S1). At this time, step S1 may be performed by the above-described startup On/Off determination unit 10.

In step S1, if it is determined that the ignition is not in the Off state, the Off state of the engine 6 can be confirmed again.

The step of supplying air at a predetermined flow rate to the exhaust gas flow path (R) by driving the air flow rate forming unit (4) described above is shorter than the first target driving time of the cooling medium supply unit (3) when the vehicle is started off. It includes a step of setting a second target operation time of the cooling medium supply unit 3 (step S2). At this time, step S2 may be performed by the target driving time setting unit 20 described above.

In step S2, if the first target driving time is greater than or equal to a certain value, the second target driving time can be set.

Next, the step of supplying air at a predetermined flow rate to the exhaust gas flow path (R) by driving the air flow rate forming unit 4 is to supply air at a predetermined flow rate to the exhaust gas flow path (R) according to the set second target driving time. It includes the step of controlling the air flow rate forming unit 4 to supply (step S3). At this time, step S3 may be performed by the air flow rate control unit 30 described above.

Next, the step of supplying air at a predetermined flow rate to the exhaust gas flow path (R) by driving the air flow rate forming unit 4 is performed so that the temperature of the exhaust gas flow path (R) according to the supplied air at a predetermined flow rate is less than a certain temperature. It further includes a recognition determination step (step S4). At this time, step S4 may be performed by the temperature determination unit 40 described above.

In step S4, if it is determined that the temperature of the exhaust gas flow path R is below a certain temperature, the operation of the air flow rate forming unit 4 is controlled to stop (step S5). At this time, step S5 may be performed by the air flow rate control unit 30 described above.

Additionally, in step S4, when it is determined that the temperature of the exhaust gas flow path R is above a certain temperature, the air flow rate controller 30 may control the air flow rate forming section 4 to continue to operate.

Next, the step of controlling the operation of the cooling medium supply unit 3 according to the operation of the air flow rate forming unit 4 is to determine that the temperature of the exhaust gas flow path R is below a certain temperature according to the supplied predetermined flow rate of air. When determined, it includes setting the second target driving time to the driving time of the cooling medium supply unit 3 (step S6). At this time, step S6 may be performed by the drive time setting unit 50 described above.

Next, the step of controlling the operation of the cooling medium supply unit 3 according to the operation of the air flow rate forming unit 4 is to control the operation of the cooling medium supply unit 3 in a state in which the temperature of the exhaust gas flow path R is below a certain temperature. It further includes controlling the operation of the cooling medium supply unit 3 according to the operation time (step S7). At this time, step S7 may be performed by the cooling medium supply control unit 60 described above.

Next, the step of controlling the operation of the cooling medium supply unit 3 according to the operation of the air flow rate forming unit 4 is when the cooling medium supply unit 3 is driven for the set driving time of the cooling medium supply unit 3, It further includes controlling the operation of the cooling medium supply unit 3 to be stopped (step S8). At this time, step S8 may be performed by the cooling medium supply control unit 60 described above.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications, changes, and substitutions can be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the attached drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the attached drawings. . The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

1: Cooling system
2: Dosing module
3: Cooling medium supply section
4: air flow forming part
5: EGR part
6: engine
100: cooling control device
10: Startup On/Off judgment unit
20: Target driving time setting unit
30: air flow control unit
40: Temperature judgment unit
50: Driving time setting unit
60: Cooling medium supply control unit
R: Exhaust gas flow path

Claims (24)

In the cooling system for the dosing module of a vehicle, including an engine, an exhaust gas flow path, and a dosing module that injects urea water into the exhaust gas flow path and is disposed adjacent to the exhaust gas flow path,
An air flow rate forming unit that ensures that a predetermined flow rate of air is supplied to the exhaust gas flow path when the vehicle's engine is turned off;
Dosing, characterized in that it includes an EGR unit connected to the exhaust gas flow path and the air flow rate forming part, and having a first exhaust gas circulation part that circulates air at the predetermined flow rate through the engine and supplies it to the exhaust gas flow path. Cooling system of the module. According to clause 1,
The first exhaust gas circulation unit,
A first flow path through which air of the predetermined flow rate is distributed, and
A cooling system for a dosing module, comprising a first valve formed on the first flow path and controlling the flow of air at the predetermined flow rate between the air flow rate forming portion and the exhaust gas flow path. According to clause 2,
The first valve is a cooling system for a dosing module, characterized in that it is provided between an intake side of the engine and an exhaust side of the engine. According to clause 2,
When the first valve is opened, the predetermined flow rate of air is supplied to the exhaust gas flow path through the first flow path,
When the first valve is closed, the predetermined flow rate of air flows in the direction of the air flow rate forming part. According to clause 2,
The first exhaust gas circulation unit,
A first cooler provided on the first flow path between the first valve and the exhaust side of the engine and cooling the air of the predetermined flow rate supplied through the first flow path, and
The cooling system of the dosing module further includes a bypass valve formed on the first flow path and connected to a rear side of the inlet portion of the first cooler and a front side of the outlet portion of the first cooler. According to clause 1,
A cooling system for a dosing module, further comprising a DPF provided between the exhaust gas flow path and the first exhaust gas circulation unit. According to clause 1,
A cooling medium supply unit that supplies cooling medium to the dosing module, and
The cooling system of the dosing module, further comprising a cooling control device that controls the operation of the cooling medium supply unit according to the operation of the air flow rate forming unit. According to clause 7,
The cooling control device,
a target driving time setting unit that sets a second target driving time of the cooling medium supply unit that is shorter than the first target driving time of the cooling medium supply unit when the vehicle is started off;
an air flow rate controller that controls the air flow rate forming unit so that a predetermined flow rate of air is supplied to the exhaust gas flow path according to the set second target driving time; and
A cooling system for a dosing module, comprising a drive time setting unit that sets the second target drive time as the drive time of the cooling medium supply unit, according to the supplied air flow rate of the predetermined amount. According to clause 7,
The cooling control device,
A cooling system for a dosing module, further comprising an ignition On/Off determination unit that determines the On/Off state of the vehicle ignition. According to clause 8,
The target driving time setting unit,
A cooling system for a dosing module, characterized in that when the first target driving time is above a certain value, the second target driving time is set. According to clause 8,
The cooling control device,
A temperature determination unit that determines whether the temperature of the exhaust gas flow path according to the supplied air flow rate is less than a certain temperature, and
The cooling system of the dosing module further comprising a cooling medium supply control unit that controls the operation of the cooling medium supply unit according to the set driving time of the cooling medium supply unit when the temperature of the exhaust gas flow path is below a certain temperature. . According to clause 11,
The air flow control unit,
A cooling system for a dosing module, characterized in that when the temperature of the exhaust gas flow path is below a certain temperature, the operation of the air flow rate forming unit is controlled to stop. According to claim 11,
The air flow control unit,
A cooling system for a dosing module, characterized in that when the temperature of the exhaust gas flow path is above a certain temperature, the air flow rate forming unit is controlled to continue operating. According to claim 11,
The cooling medium supply control unit,
A cooling system for a dosing module, characterized in that when the cooling medium supply unit is driven for the set driving time of the cooling medium supply unit, the operation of the cooling medium supply unit is controlled to stop. In a method of cooling a dosing module of a vehicle,
The vehicle includes an engine, an exhaust gas passage, a dosing module that injects urea water into the exhaust gas passage and is disposed adjacent to the exhaust gas passage, a cooling medium supply unit that supplies a cooling medium to the dosing module, and An air flow rate forming part that supplies air at a predetermined flow rate to the exhaust gas flow path, and a device connected to the exhaust gas flow path and the air flow rate forming part and circulating the air at the predetermined flow rate through the engine to supply it to the exhaust gas flow path. 1 Including an EGR unit having an exhaust gas circulation unit,
When the vehicle's engine is off, driving the air flow rate forming unit to supply air at the predetermined flow rate to the exhaust gas flow path; and
A method of cooling a dosing module comprising: controlling the operation of the cooling medium supply unit according to the operation of the air flow rate forming unit. According to clause 15,
A method of cooling a dosing module, further comprising determining an On/Off state of the vehicle ignition. According to clause 15,
The step of supplying air at a predetermined flow rate is,
Setting a second target driving time of the cooling medium supply unit shorter than the first target driving time of the cooling medium supply unit when the vehicle is started off; and
A method of cooling a dosing module, comprising controlling the air flow rate forming unit so that the predetermined flow rate of air is supplied to the exhaust gas flow path according to the set second target driving time. According to clause 17,
The step of supplying air at a predetermined flow rate is,
A method for cooling a dosing module, further comprising determining whether the temperature of the exhaust gas flow path according to the supplied air flow rate is less than a certain temperature. According to clause 17,
In the step of setting the second target driving time,
Cooling method of a dosing module, characterized in that when the first target driving time is greater than a certain value, the second target driving time is set. According to clause 18,
The step of supplying air at a predetermined flow rate is,
When it is determined that the temperature of the exhaust gas flow path is below a certain temperature, the cooling method of the dosing module further includes controlling the operation of the air flow rate forming unit to be stopped. According to clause 18,
The step of supplying air at a predetermined flow rate is,
When it is determined that the temperature of the exhaust gas flow path is above a certain temperature, the cooling method of the dosing module further includes controlling the air flow rate forming unit to continue to operate. According to clause 17,
The step of controlling the operation of the cooling medium supply unit is:
A method of cooling a dosing module, comprising setting the second target driving time as the driving time of the cooling medium supply unit according to the supplied air flow rate of the predetermined amount. According to clause 22,
The step of controlling the operation of the cooling medium supply unit is:
A method of cooling a dosing module, further comprising controlling the operation of the cooling medium supply unit according to the set operation time of the cooling medium supply unit when the temperature of the exhaust gas flow path is below a certain temperature. According to clause 23,
The step of controlling the operation of the cooling medium supply unit is:
A method of cooling a dosing module, further comprising controlling the operation of the cooling medium supply unit to stop when the cooling medium supply unit is driven for the set driving time of the cooling medium supply unit.

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