KR20110087055A - Controller sensing exhaust-gas pressure in diesel particulate filter equipped vehicle - Google Patents

Abstract

PURPOSE: A back-pressure sensitive exhaust line for a diesel particulate filter mounted vehicle is provided to prevent the reduction of output and fuel efficiency caused by the internal pressure of exhaust gas by efficiently guiding exhaust gas through a discharge pipe branched to two sides. CONSTITUTION: A back-pressure sensitive exhaust line for a diesel particulate filter mounted vehicle comprises an intake pipe(11), an exhaust pipe(10), a filter(21), an electric heater(22), first and second back pressure sensors(40,40'), first and second flow control valves(50,50'), and a controller(60). The exhaust pipe comprises first and second discharge pipes with one end communicated with the intake pipe and the other end is opened to discharge exhaust gas. The first and second back pressure sensors measures the internal pressure of the first and second discharge pipes. The first and second flow control valves control the flow rate of exhaust gas in the first and second discharge pipes. The controller individually controls the operations of the electric heater and the first and second flow control valves.

Description

Controller Sensing Exhaust-gas Pressure In Diesel Particulate Filter Equipped Vehicle}

The present invention efficiently discharges harmful emissions in exhaust gas generated during engine driving of a diesel vehicle, and collects particulate matter to improve output and fuel efficiency by suppressing exhaust pressure, that is, back pressure generation. A back pressure sensitive exhaust line of a vehicle equipped with a regenerative filter is provided.

In general, an engine which is a driving source of an automobile is a device that generates a driving output of an automobile from a compression ignition explosion of fuel, and inevitably generates exhaust gas due to fuel explosion and combustion.

The exhaust gas includes particulate matter commonly referred to as soot or PM (Particular Matter), and since such particulate matter is a major cause of air pollution and human diseases, it is harmful emissions for recent environmental protection. Mandatory attachment of vehicles to filter gas has been enforced by policy.

In the case of the filter, most of the particulate matter contained in the exhaust gas is initially collected during the passage through the filter, but after a certain time, the particulate matter gradually accumulates in the filter and exhaust gas is not smoothly discharged to the outside. As a result of the increase in back pressure, there is a problem of lowering engine power and fuel economy.In this case, the filter may be replaced regularly or the filter may be cleaned using compressed air, but the filter is relatively expensive, and thus regular replacement is difficult. During the filter cleaning operation, the deposited particulate matter can be easily scattered due to carelessness, which causes a problem that the effect of the filter installed to prevent the scattering of particulate matter becomes useless.

Therefore, in order to solve the above problem, a particulate particulate regeneration filter (DPF: Diesel Particulate Filter) is installed at the end of the exhaust line.

The particulate matter collecting regeneration filter (DPF) may include a filter configured to collect particulate matter of exhaust gas therein; An electric heater is installed in front of the filter, and is heated by receiving power to burn and burn the particulate matter collected in the filter.

Looking at the operation of the DPF (Diesel Particulate Filter), the particulate matter is collected in a specially processed expensive filter for a certain period of time, and after a certain period of time, the electric heater using the battery power of the vehicle By activating, the particulate matter collected in the filter is oxidized and discharged to the outside.

Therefore, the exhaust gas exhausted from the engine of the vehicle flows into the particulate particulate filter through the exhaust line and is discharged to the outside after the harmful gas and particulate matter are removed by the filter and the electric heater. Done.

However, the DPF (Diesel Particulate Filter) installed in the exhaust line prevents the exhaust gas from being smoothly discharged as the filter is blocked by the particulate material, and thus particulate matter collected in the filter by the electric heater. Until this is completely burned, the internal pressure is continuously increased in the exhaust line, which not only adversely affects the engine, but also causes knocking of the engine or a decrease in output, thereby lowering fuel efficiency.

The present invention has been made in order to solve the above problems, by efficiently inducing the exhaust gas generated when driving the engine of the vehicle through the outlet pipe branched in both directions to reduce the output and fuel economy due to the internal pressure of the exhaust gas as in the prior art It is an object of the present invention to provide a back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collecting and regenerative filter which can induce a high efficiency output by drastically improving the problem of low efficiency.

The present invention for achieving the above object,

An exhaust pipe comprising an inlet pipe into which exhaust gas is introduced, and first and second outlet pipes, one end of which is in communication with the inlet pipe and the other end of which is opened to discharge the exhaust gas;

It is equipped with a filter that collects particulate matter inside and an electric heater that generates heat through a power source, and is separately installed in the first and second outlet pipes to oxidize and burn particulate matter collected in the filter through the electric heater. Two filter units;

First and second front pressure sensors which are separately installed in the first and second outlet pipes and disposed in front of the first and second filter pipes and measure the internal pressure of the first and second outlet pipes;

First and second rear pressure sensors which are separately installed in the first and second outflow pipes and arranged at the rear of the first and second outflow pipes and measure the internal pressure of the first and second outflow pipes;

A first flow rate and a second flow rate, which are separately installed in the first and second outflow pipes and disposed in front of the first and second forward pressure sensors to control the flow rate of the exhaust gas moving along the first and second outflow pipes. A control valve;

The controller receives the pressure measurement values from the first and second front pressure sensors and the first and second rear pressure sensors, respectively, and controls the electric heaters of the first and second filters and the first and second flow control valves individually. do.

According to the present invention having the above configuration, the exhaust gas is efficiently guided through an exhaust pipe composed of one inlet pipe and first and second outlet pipes branched at the distal end of the intake pipe. It is possible to fundamentally solve the problem of lowering efficiency and low fuel efficiency.

In addition, the internal pressure of the first and second outlet pipes is continuously measured through the first and second front pressure sensors and the first and second rear pressure sensors respectively installed at the front and rear of the first and second filters. Since the blockage rate of the two filters and the combustion timing of the particulate matter collected therein can be accurately predicted, it is possible to prevent the first and second filters from being closed due to the particulate matter and the loss of function.

1 is a schematic view showing a first embodiment of a back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collecting regeneration filter according to the present invention;
Figure 2 is a block diagram showing the interrelationship between some components in the first embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collection regeneration filter according to the present invention.
3 to 4 is an operational relationship showing a first embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collection regeneration filter according to the present invention.
5 is a schematic view showing a second embodiment of a back pressure-sensitive exhaust line of a vehicle equipped with a particulate matter collection regeneration filter according to the present invention;
Figure 6 is a schematic view showing a third embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collection regeneration filter according to the present invention.
Figure 7 is a block diagram showing the interrelationship between some components in the third embodiment of the back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collecting regeneration filter according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail.

1 to 4 are diagrams showing a first embodiment of a back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collecting and regenerating filter according to the present invention.

The back pressure sensitive exhaust line of the vehicle equipped with the particulate matter collecting and regenerating filter according to the present invention has an inlet pipe 11 through which the exhaust gas is introduced, and one end thereof communicates with the inlet pipe 11, and the other end is opened to exhaust the exhaust gas. An exhaust pipe 10 formed of first and second outlet pipes 12 and 12 '; First and second filters 20 and 20 'installed separately in the first and second outlet pipes 12 and 12' to oxidize and burn particulate matter collected in the filter 21 through the electric heater 22; Installed separately in the first and second outlet pipes 12 and 12 ', and are disposed in front of the first and second filter pipes 20 and 20', thereby increasing the internal pressure of the first and second outlet pipes 12 and 12 '. First and second front pressure sensors 30 and 30 'to measure; The first and second outlet pipes 12 and 12 'are separately installed, and are disposed behind the first and second filter 20 and 20', so as to increase the internal pressure of the first and second outlet pipes 12 and 12 '. Measuring first and second rear pressure sensors 40 and 40 '; The first and second outlet pipes 12 and 12 'can be opened and closed individually, and are disposed in front of the first and second front pressure sensors 30 and 30', so that the first and second outlet pipes 12 and 12 'are disposed. First and second flow rate control valves 50 and 50 'for controlling the flow rate of the exhaust gas moving along'); Electric heaters of the first and second filters 20 and 20 'receive pressure measurement values from the first and second front pressure sensors 30 and 30' and the first and second rear pressure sensors 40 and 40 ', respectively. And a control unit 60 for individually controlling the operations of the 22 and first and second flow control valves 50 and 50 ', which are illustrated in FIGS. 1 and 4.

In the present embodiment, a known resonance silencer 100 is installed in the inlet pipe 11 of the exhaust pipe 10, and a known expandable silencer 110 is installed in the first and second outlet pipes 12 and 12 ′. Is installed.

The known resonance silencer 100 is a device in which a number of holes that are reduced and enlarged are formed in different sizes and arrangements, and the noise and vibration generated from the engine by the resonance silencer 100 are greatly increased. It can be attenuated.

In addition, the well-known expansion silencer 110 is a device that converts and responds to air resistance values for noise by making a plurality of compartments having a reduced and enlarged cross-sectional area therein.

As mentioned above, a known resonance silencer 100 is installed at the front end of the inflow pipe 11, and an exhaust line 1 of the engine is installed at the front end of the resonance silencer 100.

The first and second filter units 20 and 20 'installed in the first and second outlet pipes 12 and 12' to oxidize and burn particulate matter collected in the filter 21 through the electric heater 22 are provided. A filter 21 for collecting particulate matter therein; It consists of an electric heater 22 that generates heat through a power source.

The first and second filters 20 and 20 'are known particulate collection filter (DPF), which collect particulate matter contained in exhaust gas through a filter 21 installed therein, and filter ( The particulate matter collected in the filter 21 is oxidized and burned through the electric heater 22 installed adjacent to the front of the 21 and discharged.

In the case of the electric heater 22, the operation is controlled by the control unit 60, which will be described later. The control unit 60 is a conventional electronic control unit (ECU).

First and second front pressure sensors 30 and 30 'and first and second rear pressure sensors 40 and 40' are installed at the front and the rear of the first and second filters 20 and 20 ', respectively. The internal pressure of the outlet pipes 12 and 12 'is measured, and the measured results are continuously transmitted to the controller 60.

First and second flow control valves 50 and 50 'are installed in front of the first and second forward pressure sensors 30 and 30' installed in the first and second outflow pipes 12 and 12 '. The flow rate of the exhaust gas moving along the first and second outflow pipes 12 and 12 'is intermittent.

Although the first and second flow control valves 50 and 50 'are not illustrated in detail, the first and second flow control valves 50 and 50' are generally smaller than the diameters of the first and second outlet pipes 12 and 12 ', and the opening and closing plates are formed around the shaft. It consists of a drive actuator to be rotated.

In addition, if necessary, power transmission means such as racks and pinions may be selectively applied to control the first and second flow control valves 50 and 50 'with one driving actuator.

Looking at the operation relationship in the first embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collecting and regeneration filter according to the present invention.

Exhaust gas, vibrations and noise emitted from the engine are moved along the exhaust line (1), and the resonant silencer (100) passes through the moving process. In this case, most of the vibration is absorbed, and the exhaust gas and some noise are intact. Passed through, some noise and exhaust gas is passed to the inlet pipe (11).

The exhaust gas moved to the inlet pipe 11 is moved to the first and second outlet pipes 12 and 12 'split in both directions at the end of the inlet pipe 11, which is first installed in the first outlet pipe 12. The first flow control valve 50 is open to allow the exhaust gas to pass through, but the second flow control valve 50 'installed in the second outlet pipe 12' is closed so that the exhaust gas does not pass. It becomes stagnant.

On the other hand, the exhaust gas moved along the first outlet pipe 12 is passed through the first filter 20, particulate matter contained in the exhaust gas, that is, smoke or PM (Particular Matter) to the filter 21 Only the harmless gas is collected and discharged through the first filter 20.

At this time, the first front pressure sensor 30 and the first rear pressure sensor 40 respectively installed at the front and rear of the first filter 20 continuously measure the internal pressure of the first outlet pipe 12, The measured result is transmitted to the controller 60.

If the filter 21 of the first filter 20 is blocked by particulate matter, the first front pressure sensor 30 gradually increases in pressure, and the first rear pressure sensor 40 reverses the pressure. The control unit 60 determines the comparison, that is, the set pressure value.

Accordingly, the control unit 60 transmits an operation signal to the first flow control valve 50, and the first flow control valve 50 receiving the operation signal from the control unit 60 is closed in an open state. Instead of closing all of the first outlet pipe 12, only a part of the exhaust gas is controlled to be opened slightly so that it can be introduced.

In addition, the controller 60 controls the electric heater 22 installed adjacent to the filter 21 of the first filter 20 so that the electric heater 22 is heated to a high temperature, and the electric heater heated to a high temperature. Oxidized and burned particulate matter trapped in the filter 21 through 22 to regenerate the filter 21 blocked by the particulate matter.

On the other hand, the control unit 60 transmits an operation signal to the second flow control valve 50 'in order to release the state of the second flow control valve 50' closing the second outlet pipe 12 '. In addition, the second flow control valve 50 ′ receiving the operation signal is controlled to be opened by operation, and thus, the exhaust gas can be naturally discharged without clogging. This series of processes is illustrated in FIGS. 2 and 3. Shown together.

In addition, when the controller 60 determines that the pressure of the first front pressure sensor 30 installed in the first outlet pipe 12 and the pressure of the first rear pressure sensor 40 are equal, the first flow rate control is performed. It is preferable to completely close the first outlet pipe 12 slightly opened by the valve 50 to prevent further exhaust gas from flowing in, which is illustrated in FIG. 4.

Therefore, it is possible to fundamentally solve the problem that the fuel efficiency and output drop due to the pressure of the exhaust gas through the iterative process as described above.

FIG. 5 is a view showing a second embodiment of a back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collecting and reproducing filter according to the present invention.

The second embodiment of the back pressure sensitive exhaust line of the vehicle equipped with the particulate matter collecting and regenerating filter according to the present invention is the same as the configuration of the first embodiment described above, but the shape of the exhaust pipe 10 is slightly different. In more detail, the first and second inlet pipes 81 and 81 'having one end connected to end portions of the first and second outlet pipes 12 and 12' of the exhaust pipe 10, and the other ends are connected to each other. and; A discharge pipe 82 having one end connected to the other end of the first and second inlet pipes 81 and 81 'connected to each other and opened at the other end is reinforced.

In the present embodiment, since the configuration is the same as the first embodiment, a detailed description of the operation relationship will be omitted.

6 to 7 are views showing a third embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collection regeneration filter according to the present invention.

The third embodiment of the back pressure-sensitive exhaust line of the vehicle equipped with the particulate matter collecting and regenerating filter according to the present invention is the same as the configuration of the first embodiment described above, except that the first and second front pressure sensors 30 and 30 'are provided. And the first and second temperature sensors 90 and 90 'are reinforced between the first and second flow control valves 50 and 50'.

In the present embodiment, the first and second flow control valves 50 and 50 'are provided at the front ends of the first and second outlet pipes 12 and 12' branched from the ends of the inlet pipe 11, respectively. In addition, it is possible to induce a flow that does not interfere with the flow of exhaust gas.

For reference, as in the first embodiment and the second embodiment, the first and second flow control valves 50 and 50 'installed in the first and second outlet pipes 12 and 12' are the inlet pipes 11. If the gas flows smoothly, the exhaust gas flows smoothly to the first outflow pipe 12 having the initial flow rate control valve 50 opened, but the second flow rate control valve 50 ' The exhaust gas does not flow to the second outlet pipe 12 ′ closed by), and the phenomenon is gradually stagnated.

Accordingly, the flow of the exhaust gas to flow to the first outlet pipe 12 due to stagnation in the exhaust gas of the second outlet pipe 12 ′ is prevented from flowing smoothly due to mutual interference with the stagnant exhaust gas. Since the internal pressure of the first outlet pipe 12 may increase due to the above, the first and second flow control valves 50 and 50 'may be branched from the ends of the inlet pipe 11. By installing at the front end of the outlet pipe (12, 12 '), so that the flow of the exhaust gas can be smoothly induced without disturbing the flow of exhaust gas.

On the other hand, the amount of exhaust gas discharged at low speed and the exhaust gas discharged at high speed are different from each other, and the temperature of the exhaust gas at this time is also different.

Therefore, rather than controlling the first and second flow control valves 50 and 50 'using only the first and second front pressure sensors 30 and 30' and the first and second rear pressure sensors 40 and 40 ', The first and second temperature sensors 90 and 90 'are installed in the first and second outlet pipes 12 and 12', and the first and second flow control valves 50, By individually controlling the opening and closing rate of 50 '), the flow rate of the exhaust gas flowing through the first and second flow control valves 50 and 50' can be more precisely controlled.

In the present embodiment, the first and second temperature sensors 90 and 90 'are installed between the first and second forward pressure sensors 30 and 30' and the first and second flow control valves 50 and 50 ', respectively. Although described and illustrated, a temperature sensor may be further installed in the inlet pipe 11 as necessary for more precise control.

For reference, the configurations of the first to third embodiments may be selectively used in combination as necessary, and various modifications may be made without departing from the scope of the claims of the present invention.

1: Exhaust Line 10: Exhaust Pipe
11: inlet 12,12 ': outlet 1, 2
20,20 ': 1st, 2nd filter 21: Filter
22: electric heater 30,30 ': first and second front pressure sensor
40,40 ': 1st, 2nd pressure sensor 50,50': 1st, 2nd flow control valve
70: control part 81,81 ': 1st, 2nd inflow pipe
82: discharge pipe 90,90 ': first and second temperature sensor
100: resonance silencer 110: inflatable silencer

Claims (6)

An exhaust pipe 10 including an inlet pipe 11 through which exhaust gas is introduced, and first and second outlet pipes 12 and 12 'through which one end is in communication with the inlet pipe 11 and the other end is opened to exhaust the exhaust gas. Wow;
A filter 21 for collecting particulate matter therein and an electric heater 22 for generating heat through a power source are provided separately in the first and second outflow pipes 12 and 12 'and installed in the filter 21. First and second filters 20 and 20 'for oxidizing and burning the collected particulate matter through the electric heater 22;
Installed separately in the first and second outlet pipes 12 and 12 ', and are disposed in front of the first and second filter pipes 20 and 20', thereby increasing the internal pressure of the first and second outlet pipes 12 and 12 '. First and second front pressure sensors 30 and 30 'to measure;
The first and second outlet pipes 12 and 12 'are separately installed, and are disposed behind the first and second filter 20 and 20', so as to increase the internal pressure of the first and second outlet pipes 12 and 12 '. Measuring first and second rear pressure sensors 40 and 40 ';
The first and second outlet pipes 12 and 12 'can be opened and closed individually, and are disposed in front of the first and second front pressure sensors 30 and 30', so that the first and second outlet pipes 12 and 12 'are disposed. First and second flow rate control valves 50 and 50 'for controlling the flow rate of the exhaust gas moving along');
Electric heaters of the first and second filters 20 and 20 'receive pressure measurement values from the first and second front pressure sensors 30 and 30' and the first and second rear pressure sensors 40 and 40 ', respectively. (22) and a control unit (60) for individually controlling the operation of the first and second flow control valves (50, 50 ').
The method of claim 1,
The exhaust pipe 10 has first and second inflow pipes 81 and 81 ', one end of which communicates with the distal ends of the first and second outlet pipes 12 and 12', respectively, and the other end thereof is interconnected. A back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collection regeneration filter, characterized in that the discharge pipe 82 is connected to the other end of the connected first and second inlet pipes (81, 81 '), and the other end is opened.
The method according to any one of claims 1 to 2,
The first and second temperature sensors 90, which are disposed between the first and second front pressure sensors 30 and 30 'and the first and second flow control valves 50 and 50', respectively, to measure the temperature of the exhaust gas. , 90 ') is further provided with a reinforcement back pressure sensitive exhaust line of a vehicle equipped with a particulate matter collection regeneration filter.
The method according to claim 1 or 2,
The inlet pipe 11 is a resonant silencer 100 is further provided with a reinforcement pressure-sensitive exhaust line of the particulate matter collecting and regeneration filter equipped vehicle, characterized in that the reinforcement is provided.
The method of claim 1,
Back pressure sensitive exhaust line of the vehicle equipped with particulate matter collecting and regeneration filter, characterized in that the expansion silencer 110 is further reinforced at the distal end of the first and second outflow pipe (12, 12 ').
The method of claim 2,
The discharge pipe 82 is a back pressure-sensitive exhaust line of the vehicle equipped with particulate matter collection regeneration filter, characterized in that the expansion silencer 110 is further reinforced.

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