KR101666157B1 - Scr device having exhaust brake control module for enforcing urea water supplement - Google Patents

Scr device having exhaust brake control module for enforcing urea water supplement Download PDF

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Publication number
KR101666157B1
KR101666157B1 KR1020160032492A KR20160032492A KR101666157B1 KR 101666157 B1 KR101666157 B1 KR 101666157B1 KR 1020160032492 A KR1020160032492 A KR 1020160032492A KR 20160032492 A KR20160032492 A KR 20160032492A KR 101666157 B1 KR101666157 B1 KR 101666157B1
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South Korea
Prior art keywords
scr
exhaust brake
control module
temperature
urea water
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KR1020160032492A
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Korean (ko)
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김동희
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(주)가온테크
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0222—Exhaust gas temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The exhaust brake control module according to the present invention is an exhaust brake control module for receiving SCR sensing data and outputting a driving signal of an exhaust brake valve, wherein the SCR sensing data is an urea quantity and an exhaust gas temperature, And an exhaust brake driving unit for closing the exhaust brake when the number of urethane water is insufficient or when the temperature of the exhaust gas is lower than a predetermined urea water injection temperature.

Description

SCR DEVICE HAVING EXHAUST BRAKE CONTROL MODULE FOR ENFORCING UREA WATER SUPPLEMENT WITH EXHAUST BRAKE CONTROL MODULE

The present invention relates to an SCR device with an exhaust brake control module, and more particularly to an SCR device having an exhaust brake control module for driving an exhaust brake and for urging urea water replenishment will be.

Transport devices using diesel as fuel cause serious air pollution due to exhaust gas. Particulate matter (PM) and nitrogen oxides (NOx), which occupy most of the exhaust gas, are known to cause bronchitis, emphysema and lung cancer.

The automobile can be completely burned by oxidizing the fuel with high temperature and high ignition point, and the nitrogen oxide in the exhaust gas can be considerably lowered. However, it is very difficult to maintain such conditions continuously during operation.

Accordingly, regulations for reducing PM and NOx in the exhaust gas are disclosed, and automobile manufacturers apply various methods for reducing PM and NOx to automobiles.

Simultaneous reduction of PM and NOx is a device for reducing PM and NOx by installing a filter and an SCR device continuously. The SCR (Selective Catalytic Reduction) system is a device for reducing nitrogen oxide by injecting urea water into an exhaust device , And the nitrogen oxide is reduced through the catalytic reaction. In the SCR system, the urea water is replaced by ammonia and reacts with nitrogen oxides to release nitrogen and water.

The vehicle can be operated even when the number of urea in the SCR device is absent, and the removal efficiency of nitrogen oxides is not exhibited at all. In the case of the initial mass-production vehicle, an engine management system (EMS) is used to limit the output.

Also, there is no realistic way to regulate automobiles that operate without supplements of ellipses from relevant agencies such as the Ministry of Environment and the Automotive Environment Association. Although we are trying to monitor periodically using a method using a remote monitoring device, it is not a fundamental solution.

The 'Ureating device and method of the system' of Patent Publication No. 10-2015-0139169 can improve the low-temperature operation of the SCR system by heating the urea in the urea tank for the SCR system of the commercial vehicle using the thermoelectric element Urea heating system of SCR system is proposed. 'Method and Catalyst System for SCR of Patent Publication No. 10-2011-0033045, wherein the first catalyst bed is iron-beta-zeolite and the second catalyst bed comprises silver supported on alumina, at least two catalyst beds And passing the exhaust gas through the catalyst system in the presence of a reducing agent. EP 2,942,502 (A1) 'water consumption diagnostic device for urea scr' is a urea consumption diagnostic device for urea SCR, which proposes a diagnostic device capable of detecting normal and abnormal spraying of urea from a valve. The 'sense diagnostic apparatus and SCR system' of JP No. 5533235, when the deviation between the calculated value of the NOx concentration and the detected value of the NOx concentration detected by the NOx sensor is larger than the threshold value for judgment, And a determination threshold value setting unit for setting a threshold value for determination based on the temperature of the cooling water for cooling the engine, the atmospheric pressure, and the temperature of the outside air.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an exhaust brake control module, a control unit, and an SCR controller that can limit the output of a vehicle when the number of elements of a vehicle is not filled, .

It is also an object of the present invention to provide an exhaust brake control module, a control unit, and an SCR controller capable of raising the exhaust temperature of a running vehicle at startup or at low speed to normalize the SCR operation.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the following description.

The exhaust brake control module according to the present invention is an exhaust brake control module for receiving SCR sensing data and outputting a driving signal of an exhaust brake valve, wherein the SCR sensing data is an urea quantity and an exhaust gas temperature, And an exhaust brake driving unit for closing the exhaust brake when the number of urethane water is insufficient or when the temperature of the exhaust gas is lower than a predetermined urea water injection temperature.

In addition, the exhaust brake control module further includes a recognition signal generation unit for generating a urea number supplement signal for informing the driver (or the vehicle inspector) of the lack of ellipsis.

In addition, the SCR sensing data further includes a NOx sensing value from a rear end NOx sensor and a front end NOx sensor, and the recognition signal generating unit further generates an SCR failure signal informing a driver (or a vehicle inspector) When the driving voltage or the driving current of the SCR control module for controlling the number of urea injection is less than a predetermined value or when the exhaust gas temperature is higher than the urea water injection temperature and the measured value of the downstream NOx sensor is higher, And generates an SCR failure signal when the difference in measured values from the front-end NOx sensor is below a certain range.

According to the first embodiment of the present invention, the exhaust brake control module is provided inside the SCR controller.

According to the second embodiment of the present invention, the exhaust brake control module is installed in the exhaust brake control unit together with the communication module, and the exhaust brake control unit is connected to the SCR controller by CAN communication.

At this time, the exhaust brake control module according to the second embodiment is directly connected to the urea water meter and the exhaust gas temperature sensor, and the front stage NOx sensor and the rear stage NOx sensor are connected by CAN communication.

Further, the SCR failure signal generated in the exhaust brake control module is generated from the driving voltage or the driving current of the SCR controller.

According to the first and second embodiments of the present invention, the generated recognition signal can be outputted to the OBD terminal of the vehicle.

According to the present invention, by outputting a warning message to the OBD terminal in response to the insufficient number of elements, it is possible for the driver of the vehicle to recognize the ellipsis supplement.

In addition, the driver of the vehicle can quickly recognize the failure of the SCR device in the event of a failure.

According to the present invention, when the temperature of the exhaust gas of the vehicle is lower than the urea water proper injection temperature, the temperature of the exhaust gas can be quickly increased by operating the exhaust brake.

In addition, when the number of elements is insufficient, there is an advantage that the output of the vehicle is lowered so that the driver can be warned quickly.

1 shows an SCR device according to a first embodiment of the present invention.
2 shows an SCR controller according to a first embodiment of the present invention.
3 shows a control operation of the exhaust brake control module according to the first embodiment of the present invention.
4 shows an SCR device according to a second embodiment of the present invention.
5 shows an SCR controller and an exhaust brake control unit according to a second embodiment of the present invention.
6 shows an exhaust brake according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, elements shown in the drawings may be exaggerated, omitted, or schematically represented.

1 shows an SCR device according to a first embodiment of the present invention.

The SCR apparatus according to the first embodiment of the present invention includes an SCR controller 100, a urea tank, a catalytic converter (SCR converter), and a nozzle.

The SCR controller reduces the NOx contained in the exhaust gas by using the number of elements and controls the valve of the exhaust brake when the number of urea is insufficient. In addition, when the number of elements is insufficient, a urea number supplement signal is generated to the driver and a fault signal is generated when the SCR fails. The ECU (Electronic Control Unit) controls the engine, the transmission, the steering device, the braking device, OBD (On Board Diagnostics) is an automobile driving record self-diagnosis device, and an exhaust brake is a device for forcibly shutting off exhaust gas for braking a vehicle in a diesel vehicle to increase the pressure inside the engine cylinder The DPF (Diesel Particulate Filters) is a device that collects and discharges harmful soot particles to the atmosphere by burning.

Referring to the drawings, the front side NOx sensor I-NS, the temperature sensor TS and the injection nozzle are provided at the front end of the catalytic converter and the rear side NOx sensor O-NS is installed at the rear end of the catalytic converter . The front NOx sensor I-NS and the rear NOx sensor O-NS are connected to CAN (Controller Area Network) communication. In Fig. 1, the broken line indicates the connection by CAN communication.

On the other hand, when the exhaust gas is exhausted from the engine of the diesel vehicle, the exhaust gas passes through the exhaust brake and passes through the PM reduction device and the SCR device. The exhaust brake operates with air pressure. The exhaust brake is a device for reducing the number of revolutions of the engine by installing a valve in the exhaust pipe and making the expansion-exhaust process of the engine difficult by the opening and closing operation.

As shown in the drawing, a DPF is installed at a rear end of the exhaust brake. DPF (Diesel Particulate Filter) is a PM abatement device that captures particulate matter in the exhaust gas of a vehicle and increases the temperature of the exhaust gas when regulated.

Further, a catalytic converter (SCR converter) is installed at the rear end of the DPF. Selective Catalytic Reduction (SCR) converter reduces NOx through catalytic reaction of urea water. The urea water injected into the exhaust gas is replaced with ammonia by exhaust heat, and then reacts with nitrogen oxide to discharge nitrogen and water. This reaction is according to the following reaction formula.

<Reaction Scheme 1>

(NH 2 ) 2 CO + H 2 O -> 2 NH 3 + CO 2

According to the above reaction scheme 1, a low temperature or an instantaneous temperature rise does not form a catalyst environment. Ammonia is produced when the catalyst maintains a certain temperature range required by the catalyst. Ammonia is then reacted with urea water.

<Reaction Scheme 2>

4NH 3 + 4NO + O 2 ? 4N 2 + 6H 2 O ------------- (1)

2NH 3 + NO + NO 2 ? 2N 2 + 3H 2 O (2)

In the above Reaction Scheme 2, the reaction rate of (2) is higher than that of (1). These differences are known to affect NO, NO 2 ratio, and reaction temperature.

As shown in Reaction 1 and Reaction 2, the efficiency of the catalytic reaction is closely related to the temperature of the exhaust gas. In order to determine the urea water injection temperature, the SCR apparatus is provided with a temperature sensor (TS) for measuring the temperature of the exhaust gas. The injection of the urea water can be determined according to the temperature of the exhaust gas.

2 shows an SCR controller according to a first embodiment of the present invention.

The SCR controller 100 includes an SCR control module 110 and an exhaust brake control module 120 (EBCM).

The SCR control module 110 injects urea water from the injection nozzle based on the temperature of the exhaust gas measured from the temperature sensor. For example, when the temperature measured from the temperature sensor is higher than a preset temperature (for example, 200 DEG C), the urea water can be injected. The number of injected urea catalysts catalyzed by the SCR converter reduces NOx in the exhaust gas.

The exhaust brake control module 120 receives the measurement information such as the exhaust gas temperature and the NOx measurement amount, and recognizes the driving signal of the exhaust brake valve and the driver (or the vehicle manager) Lt; / RTI &gt; The exhaust brake control module includes an exhaust brake valve driving portion 121 for generating a driving signal of the exhaust brake valve and a recognition signal generating portion 122 for generating a driver (or vehicle manager) recognition signal.

The drive signal of the exhaust brake valve is outputted to the exhaust brake valve, and the recognition signal is outputted to the OBD (On Board Diagnostic) terminal.

The exhaust brake valve driver 121 outputs a driving signal of the exhaust brake valve when the urea water quantity measured by the urea water meter is less than a predetermined minimum amount. Or the exhaust brake valve drive unit may generate a drive signal for closing the exhaust brake valve in accordance with the urea water supplement signal. The exhaust brake valve drive converts the control signal into a physical signal. The exhaust brake valve is opened in a normal running state, and when the urea water is insufficient, the exhaust brake valve is closed to lower the output of the vehicle.

Further, the exhaust brake valve driving section generates a driving signal that closes the exhaust brake valve when the temperature of the exhaust gas is lower than a predetermined urea injection temperature (for example, 200 캜).

On the other hand, when the temperature of the exhaust gas is low, the catalytic reaction does not occur smoothly in the SCR device. When the valve of the exhaust brake is closed, the temperature of the exhaust gas rises. The SCR device does not emit urea water when the temperature of the exhaust gas is low.

According to the present invention, the temperature of the exhaust gas from the engine can be raised by closing the valve of the exhaust brake to raise the temperature of the exhaust gas quickly. The valve of the exhaust brake may form a vent hole spaced at a predetermined interval from the edge or may form a vent hole at the center. Here, closing of the exhaust brake valve does not mean complete closing but means closing in a state having a certain degree of opening. Such a ventilation hole has an effect of preventing excessive output reduction of the vehicle from closure of an excessive exhaust brake. For example, when the driver wants to accelerate in an emergency situation, closing of the exhaust brake may not cause rapid acceleration. At this time, excessive accelerating operation of the driver - pushing of the accelerator pedal - may cause a vent hole formed in the valve of the exhaust brake to generate a certain acceleration force as a passage of the exhaust gas.

In general, the temperature of the exhaust gas at the beginning of the running of the vehicle does not reach a temperature at which urea water injection is possible. In addition, the temperature of the exhaust gas of the vehicle at the time of low-speed operation may not reach a temperature at which urea water injection is possible. At this time, the injection of urea water is not performed, so that the catalytic reaction is not caused by the injection of the urea water, and the harmful exhaust gas is directly discharged. According to the present invention, it is possible to raise the temperature of the exhaust gas by operating the exhaust brake of the vehicle at the start of operation and at the time of low-speed operation. Such a temperature rise can raise the urea water injection temperature to induce the urea water catalytic reaction. It is possible to actuate the exhaust brake during the initial operation and the low-speed operation to enable injection of urea water.

The recognition signal generation unit 122 may generate a recognition signal to be output to the OBD terminal. OBD (On Board Diagnostic) terminal refers to a driving record self-diagnosis device, which receives measurement information such as temperature, urea quantity, pressure and the like, diagnosis information such as a failure error, and control information such as elliptical number injection from the SCR controller . The recognition signal may be an ellipsis supplement signal and an SCR failure signal.

In the present invention, the recognition signal is outputted to the OBD terminal. However, the present invention is not limited to this, and it is possible to output the recognition signal through a visual or auditory means recognizable by the driver. For example, the visual means, the auditory means may be an alarm, a speaker, or the like.

The elliptic number supplement signal is generated from the value detected in the urea water meter US. Urea number The urea number supplement signal may be output when the quantity of the urea contained in the tank is below a certain level.

If the SCR control module fails to operate normally, the recognition signal generator outputs a failure signal indicating that the SCR device does not operate normally to the OBD terminal.

The case where the SCR device can not perform the normal operation means that the SCR control module fails to perform the normal catalytic action. The normal operation state can be detected from the drive voltage or the drive current of the SCR control module. For example, when the driving voltage or the driving current of the SCR control module is less than or equal to a preset value, a fault signal can be output.

Further, when the amount of urea is sufficient, a failure signal is output when the temperature of the exhaust gas is equal to or higher than the injection temperature and the measured value of the downstream NOx sensor (O-NS) is high (higher than the allowable reference value). In this case, it means that the number of elements is in a non-injected fault condition.

Also, if the difference between the values measured from the rear end NOx sensor and the front end NOx sensor is below a certain range, it means that the catalytic action is not performed due to the urea water.

3 shows a control operation of the exhaust brake control module according to the first embodiment of the present invention.

The operation of the control module according to the present invention includes the steps of receiving SCR-related data, detecting an amount of urea in the urea water tank, checking the operation state of the SCR device, .

The step (S100) of inputting the SCR-related data includes a driving voltage (or driving current) of the SCR control module, a urea quantity measurement value of the urea water tank, a temperature value of the exhaust gas, a NOx measurement value at the front end of the SCR, NOx &lt; / RTI &gt;

In the step S200 of detecting the urea water amount of the urea water tank, the urea water quantity is measured by an urea water quantity measuring instrument US installed in the urea water tank. When the number of ellipses is lower than a predetermined minimum amount, a supplemental number of elements is generated. And also generates a drive signal for the exhaust brake valve for closing the exhaust brake valve. And lowers the output of the vehicle in accordance with the drive signal.

On the other hand, since the exhaust brake valve operates by air pressure, the opening of the exhaust brake valve can be made by a strong exhaust gas flow. Therefore, the closing of the exhaust brake valve does not lead to a dangerous situation in the running of the vehicle.

The step of checking the operating state of the SCR device (S300) determines whether the SCR device operates normally based on the driving voltage of the SCR control module. If the driving voltage (or driving current) of the SCR control module does not show a normal value, a failure signal indicating that the SCR device does not operate normally is generated.

Also, when the urea water quantity is sufficient, the SCR control module generates a failure signal that the normal operation can not be performed even when the temperature of the exhaust gas is higher than the injection temperature and the measured value of the downstream NOx sensor is higher (higher than the allowable reference value).

If the difference between the values measured from the rear end NOx sensor and the front end NOx sensor is within a certain range, it means that the catalytic action is not performed due to the urea number. This is because the NOx reduction by the SCR converter is not performed.

The step S400 of comparing the exhaust gas temperature with the set temperature compares the temperature detected from the temperature sensor TS connected to the SCR controller with a predetermined temperature. The injection of urea water can produce normal efficiency at least above 200 캜. If the temperature of the exhaust gas is lower than the set temperature, the exhaust brake valve is closed to raise the temperature of the exhaust gas. This step can raise the temperature of the exhaust gas by closing the valve of the exhaust brake even when the exhaust gas does not reach the appropriate temperature, for example 200 deg. C, at which the urea water can be injected at the early stage of the vehicle operation or the low speed operation. Such an increase in the temperature of the exhaust gas makes it possible to inject urea water, thereby inducing the catalytic reaction of the exhaust gas in accordance with the urea water injection. The steps of S200, S300, and S400 may be performed individually.

4 shows an SCR device according to a second embodiment of the present invention.

The SCR apparatus according to the second embodiment of the present invention is different from the SCR apparatus according to the first embodiment described above in that the exhaust brake control module of the SCR controller is separately constructed from the SCR apparatus.

There is an advantage that the exhaust brake control unit having the function of the exhaust brake control module according to the present invention can be simply attached to an existing vehicle equipped with the SCR device.

As shown in the drawing, an exhaust brake control unit (EBCU) including an exhaust brake control module is installed as a separate device. A front NOx sensor (I-NS), a temperature sensor (TS) and a spray nozzle are installed in front of the SCR converter, and a rear NOx sensor (O-NS) is installed at the rear end of the SCR converter. The front NOx sensor I-NS and the rear NOx sensor O-NS are connected by CAN communication.

The exhaust brake control unit drives the exhaust brake valve from the sensing data and outputs a driver recognition signal.

The SCR device according to the second embodiment includes an SCR controller including an SCR control module, a urea tank, a catalytic converter (SCR converter), and a nozzle, and includes an exhaust brake control module The exhaust brake control unit is configured separately. The exhaust brake control unit can be connected to the SCR device via CAN communication.

5 shows an SCR controller 100 and an exhaust brake control unit 900 according to a second embodiment of the present invention.

The exhaust brake control unit 900 according to the second embodiment of the present invention comprises a communication module 910 and an exhaust brake control module 920. [ The exhaust brake control module includes an exhaust brake valve driving section 921 and a recognition signal generating section 921.

The exhaust brake control module receives the temperature of the exhaust gas and the quantity of urea from the SCR controller.

In addition, the exhaust brake control module can receive NOx measurement values from the front NOx sensor (I-NS) and the rear NOx sensor (O-NS) via CAN communication.

The communication module 910 receives the temperature of the exhaust gas, the NOx value at the front end and the rear end of the SCR converter, and the urea quantity, and outputs an exhaust brake drive signal and a driver recognition signal. The connection between the communication module and the OBD and the SCR device can be performed using a communication method such as CAN (Controller Area Network), RS422, RS485, or the like.

The exhaust brake control module 920 generates a recognition signal including an exhaust brake drive signal for driving the exhaust brake and a failure signal indicating that the SCR device does not operate normally or a urea number supplement signal indicating the lack of the number of elements.

The exhaust brake driving signal and the recognition signal according to the second embodiment perform functions according to the exhaust brake driving signal and the recognition signal according to the first embodiment described above. In the case of the fault signal, a fault signal due to the power supply line interruption of the SCR device can be further added. For example, interruption of the power supply line may be the case where the driver of the vehicle may arbitrarily disconnect the SCR power supply line for ignoring the ellipsis supplement message, and may be disconnected under rough road conditions. Here, in the case of disconnection under rough road conditions, it may be a vibration due to a rough road surface, a collision with a foreign object due to exposure of a wiring part, and the like. It can therefore inform the driver or vehicle inspector of the intentional or unintentional interruption of the power line.

It is also possible to diagnose that the exhaust brake control unit (EBCU) has failed (no response) when there is no sensed data value of the temperature sensor requested by the SCR controller and the sensing data value of the urea number sensor.

The generated driver identification signal can be output to the OBD terminal. In the present invention, the recognition signal is outputted to the OBD terminal. However, the present invention is not limited to this, and it is possible to output the recognition signal through a visual or auditory means recognizable by the driver. For example, the visual means, the auditory means may be an alarm, a speaker, or the like.

In the present invention, the temperature of the exhaust gas and the quantity of urea are received from the SCR controller. However, the temperature sensor TS and the urea water quantity meter US are directly connected to the exhaust brake control unit, The urea quantity can be transferred to the exhaust brake control module.

Thus, when the SCR device is malfunctioning, the exhaust brake control module can perform an auxiliary function. For example, when the SCR device is malfunctioning, the driver can quickly check whether the SCR device is operating normally or not from the failure signal and the urea number supplement signal output from the exhaust brake control module.

6 shows an exhaust brake according to another embodiment of the present invention.

Referring to the drawings, the exhaust brake EB-1 and the exhaust brake control unit according to the present invention can be installed in a vehicle provided with a previously installed exhaust brake EB-0.

The exhaust brake EB-1 according to the present invention is operated by the exhaust brake control module according to the first and second embodiments although the existing exhaust brake EB-0 is driven by the operation of the driver. Existing exhaust brakes operate in two steps of opening and closing, but the exhaust brakes according to the present invention can be designed to have at least two stages of opening and closing degrees. Accordingly, the opening and closing degree can be adjusted according to the degree of deficiency of the urea when the SCR system fails.

The opening and closing of the exhaust brake according to the present invention can be performed smoothly when the existing exhaust brake is opened.

According to the present invention, by installing the exhaust brake and the exhaust brake control module designed in the present invention in the existing mass-produced vehicle, it is possible to easily notify the driver or the vehicle inspector in the event of a failure of the SCR system of the vehicle or insufficient quantity of urea.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

100: SCR controller
110: SCR control module
120, 920: Exhaust brake control module
121, 921: exhaust brake valve driving section
122, and 922:
900: Exhaust brake control unit
910: Communication module

Claims (8)

An SCR device including an SCR controller comprising an SCR control module and an exhaust brake control module,
The SCR control module injects a number of urea to reduce NOx contained in the exhaust gas. The exhaust brake control module receives the SCR sensing data and outputs a drive signal of the exhaust brake valve,
Wherein the SCR sensing data includes a driving voltage of the SCR control module, a urea water quantity measurement value of the urea water tank, and a temperature value of the exhaust gas,
The exhaust brake control module receives the SCR sensing data,
When the urea water quantity of the urea water tank is lower than a preset minimum quantity, a urea water supplement signal is generated and the exhaust brake valve is closed,
A failure signal is generated by determining whether the SCR device is operating normally based on the driving voltage of the SCR control module,
The temperature of the exhaust gas is compared with the predetermined temperature, and if the temperature of the exhaust gas is lower than the set temperature, the exhaust brake valve is closed to raise the temperature of the exhaust gas.
The method according to claim 1,
Wherein the SCR sensing data further includes values measured from a rear end NOx sensor and a front end NOx sensor,
A failure signal is further generated when the temperature of the exhaust gas is equal to or higher than the urea water injection temperature and the measured value of the rear end NOx sensor is high or when the difference between the values measured from the rear end NOx sensor and the front end NOx sensor is within a certain range Lt; / RTI &gt;
The method according to claim 1 or 2,
And the SCR control module and the exhaust brake control module are connected by CAN communication.



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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107524528A (en) * 2017-09-07 2017-12-29 潍柴动力股份有限公司 A kind of exhaust brake butterfly valve abatement detecting method and device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000061655A (en) * 1999-03-29 2000-10-25 박용섭 Apparatus for decreasing a load of wrench having ratchet
JP2002371831A (en) * 2001-06-13 2002-12-26 Nissan Diesel Motor Co Ltd Exhaust emission control device of automobile
KR20110033045A (en) 2009-09-24 2011-03-30 할도르 토프쉐 에이/에스 Process and catalyst system for scr of nox
JP2011202639A (en) * 2010-03-26 2011-10-13 Toyota Motor Corp Failure detecting device for exhaust emission control system for internal combustion engine
JP5533235B2 (en) 2010-05-17 2014-06-25 いすゞ自動車株式会社 NOx sensor diagnostic device and SCR system
EP2942502A1 (en) 2012-12-28 2015-11-11 Isuzu Motors, Ltd. Urea water consumption diagnostic device for urea scr
KR20150139169A (en) 2014-06-03 2015-12-11 현대자동차주식회사 Device and method for heating urea of SCR system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000061655A (en) * 1999-03-29 2000-10-25 박용섭 Apparatus for decreasing a load of wrench having ratchet
JP2002371831A (en) * 2001-06-13 2002-12-26 Nissan Diesel Motor Co Ltd Exhaust emission control device of automobile
KR20110033045A (en) 2009-09-24 2011-03-30 할도르 토프쉐 에이/에스 Process and catalyst system for scr of nox
JP2011202639A (en) * 2010-03-26 2011-10-13 Toyota Motor Corp Failure detecting device for exhaust emission control system for internal combustion engine
JP5533235B2 (en) 2010-05-17 2014-06-25 いすゞ自動車株式会社 NOx sensor diagnostic device and SCR system
EP2942502A1 (en) 2012-12-28 2015-11-11 Isuzu Motors, Ltd. Urea water consumption diagnostic device for urea scr
KR20150139169A (en) 2014-06-03 2015-12-11 현대자동차주식회사 Device and method for heating urea of SCR system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107524528A (en) * 2017-09-07 2017-12-29 潍柴动力股份有限公司 A kind of exhaust brake butterfly valve abatement detecting method and device
CN107524528B (en) * 2017-09-07 2019-12-06 潍柴动力股份有限公司 Exhaust brake butterfly valve failure detection method and device

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