KR100464624B1 - Regeneration time adjustment method of diesel fuel filter - Google Patents

Abstract

The present invention relates to a method for adjusting the regeneration time of a diesel particulate filter and a device therefor, the first exhaust valve being configured in the exhaust pipe connected to the exhaust manifold of the engine 10 to control the exhaust gas discharged to the muffler (16) And a second exhaust valve 14 connected in parallel with the first exhaust valve 12 to regulate exhaust gas discharged to the filter, and the first and second exhaust valves 12 and 14. A regenerative igniter configured to control the interruption and the front end of the filter 20 to generate heat of a predetermined temperature with battery power under the control of the ECU 18 to burn the filtered particulate matter. 22) and one or more inside one side of the filter medium 21 formed in the filter 20 detect the temperature of the filter medium 21, convert the detected temperature into an electrical signal, and output it to the ECU 18. Temperature sensors 24 and 26 to generate compressed air on their own Air tank 30 for storing air of a predetermined volume introduced from the air, and an air supply valve 28 for controlling the air in the air tank 30 to the inlet of the filter 20 under the control of the ECU 18. By burning the particulate matter of the exhaust gas filtered in the filter medium to induce safe full regeneration.

Description

Regeneration time adjustment method of diesel fuel filter

The present invention relates to a diesel particulate filter for purification, and more particularly, a diesel particulate filter for filtering particulate matter in the exhaust gas discharged from a vehicle using diesel oil and burning the filtered particulate matter to induce complete safety regeneration. The present invention relates to a method for adjusting the playback time of a device and an apparatus thereof.

The conventional diesel particulate filter has a configuration of repeating the process of burning the filtered soot at the predetermined time after collecting the particulate matter through the filter medium, or the process of shaking off without burning.

In the latter case, since the filtered particulate matter is shaken off, the filter medium does not undergo a continuous process and thus does not undergo thermal shock. On the other hand, there is almost no practical practice because it is not practically used. Most of the devices are used to perform automatic reaccumulation.

In such a case, if the filter containing the filter medium is not maintained at an appropriate temperature level during regeneration, the ceramic monolith used as the filter medium may be broken, and in the case of the ceramic fiber, the fiber may be seeded. This was a serious problem that the life of the diesel diesel soot filter device.

In addition, the conventional diesel particulate filter has the problem of accurately collecting the amount of particulate matter trapped in the filter medium so as not to overheat during regeneration, but in reality, the state of the engine, the operating conditions, the appearance of particulate matter or the driver It is not easy to precisely control the amount of particulate matter collected by the driving habits and the like.

Therefore, when particulate matter is over-collected, breakage of the filter medium occurs due to thermal shock when the temperature reaches a physical limit that the filter medium can withstand during regeneration. In this case, the filter can be protected by a control method that prevents the high temperature during the overcapture, but in the next collection, it is necessary to reduce the collection amount relatively so that the safety can be completely recovered.

On the contrary, when the regeneration of the filter medium is started in the state of being collected below the proper level, the incomplete regeneration is continuously performed, thereby reducing energy and regeneration efficiency for regeneration. In this case as well, in the next collection, it is necessary to increase the collection amount relatively to induce safe full recovery.

In these two cases, there was a difficult problem of artificially continuing to correct the playback time determining variable.

The present invention has been made in view of the above-mentioned problems, and when regenerating a filter medium containing filtered particulate matter, the temperature sensor is inserted into the filter medium to continuously monitor the temperature inside the filter medium, so that the filter medium can withstand the temperature. If it goes up, it cuts off the supply of air, that is, oxygen necessary for regeneration, so that no further combustion occurs, so that it does not exceed the temperature limit, but the temperature at the time of shutoff (regeneration upper limit temperature) and residual oxygen The difference between the temperature rise is measured and the result of the accumulation for the next regeneration is reflected in the regeneration time-determined variable to automatically adjust the variable to induce a safe full regeneration.

On the contrary, if the regeneration occurs incompletely due to the small amount of collection, the difference between the safe full regeneration zone lower limit temperature (regeneration lower limit temperature) and the maximum temperature during incomplete regeneration is measured, and the result of the accumulation for the next regeneration is reflected in the regeneration time determination variable. The purpose is to automatically adjust the control to induce a safe full regeneration.

In order to achieve the above object, the present invention comprises the steps of: storing the highest regeneration temperature during regeneration of the filter, determining whether the stored maximum regeneration temperature is higher than or equal to the set temperature T1 ℃, and the highest regeneration temperature T1 ℃ If greater, subtract 100 from the set value, determine if the maximum regeneration temperature is less than the set temperature T1 ° C and greater than T2 ° C; and if the maximum regeneration temperature is less than the set temperature T1 ° C and greater than T2 ° C. Subtracting 50 from the set value, determining whether the maximum regeneration temperature is less than the set temperature T2 ° C and greater than T3 ° C, and setting the set if the highest regeneration temperature is less than the set temperature T2 ° C and greater than T3 ° C. Maintaining the value as it is, determining whether the highest regeneration temperature is less than the set temperature T3 ° C. and greater than T4 ° C., and the highest regeneration temperature Is less than the set temperature T3 ° C and greater than T4 ° C, adding 50 to the set value, determining whether the best regeneration temperature is less than the set temperature T4 ° C, and the maximum regeneration temperature is less than the set temperature T4 ° C. In this case, the present invention provides a method for adjusting the regeneration time of a diesel fuel filter for purification of diesel fuel comprising adding 100 to a set value.

Another object of the present invention is to provide a regeneration device for a diesel filter for diesel fuel gas, comprising: a first exhaust valve disposed in an exhaust pipe connected to an exhaust manifold of an engine to control exhaust gas discharged into a silencer, and parallel with the first exhaust valve; A second exhaust valve for controlling the exhaust gas discharged to the filter connected to the control unit; an ECU controlling the interruption of the first and second exhaust valves; and a front end portion of the filter, the battery being controlled by the ECU. A regeneration igniter that generates heat of a predetermined temperature to burn the filtered particulate matter, and one or more inside one side of the filter medium constituted in the filter, detects the temperature of the filter medium, and converts the detected temperature into an electrical signal. A temperature sensor output to the ECU, an air tank that generates compressed air by itself or stores air of a predetermined capacity introduced from the outside; By it can be achieved by providing a playback position control device of the diesel exhaust purifying filter comprising an air supply valve for intermittent air in the air tank to the inlet of the filter.

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

1 is a block diagram of an apparatus for adjusting the regeneration time of the filter for diesel fuel gas purification according to the present invention.

The first exhaust valve 12 is configured in an exhaust pipe connected to an exhaust manifold (not shown) of the engine 10 to control the exhaust gas discharged to the silencer 16, and includes an ECU (Engine Control Unit; engine control unit, It is controlled by the control of 18).

The second exhaust valve 28 is connected to the exhaust pipe in parallel with the first exhaust valve 12 to control the exhaust gas discharged to the filter 20, and also to discharge the exhaust gas under the control of the ECU 18. Is determined. The first and second exhaust valves 12 and 14 include solenoids driven by electrical signals, respectively.

The ECU 18 controls the driving, the state, and the like of the engine 10 in an automobile. In the present invention, a control signal for adjusting the regeneration time of the filter for purifying diesel fuel is also output. The ECU 18 incorporates a program for controlling the regeneration time of the filter, and the program is driven in the corresponding flow by judging the condition of the filter, the state of the engine, and the like. The intermittent state of the first and second exhaust valves 12 and 14 is controlled by the ECU 18.

The filter 20 is connected to one end of the second exhaust valve 14 to filter the exhaust gas discharged from the engine 10. The filter 20 includes a regeneration igniter 22, a filter medium 21, and a plurality of temperature sensors 24, 26.

The regenerator igniter 22 is configured at the front end of the filter 20 to receive power from an automotive battery under the control of the ECU 18 to generate heat at a predetermined temperature to burn the filtered particulate matter. The regeneration igniter 22 includes electricity, a burner, a supporting catalyst, and a supporting additive.

One or more temperature sensors 24 and 26 are built into one side of the filter medium 21 formed in the filter 20 to detect the temperature of the filter medium 21 and convert the detected temperature into an electrical signal to convert the detected ECU into an ECU. 18). The temperature sensors 24 and 26 are inserted in a predetermined number in the longitudinal direction of the filter medium, so that the present temperature can be sensed according to the inserted position, and the temperature sensors 24 and 26 are actually used to regenerate the filter medium 21. According to the method, one or more temperature sensors 24 and 26 for each filter medium 21 are inserted into the filter, but are inserted at a position where the regeneration temperature reaches the highest or where the correlation is known. In the case of ceramic honeycomb, the filter may be divided into four equal parts in the longitudinal direction and inserted into 1/4, 2/4 and 3/4, respectively. In the embodiment of the present invention, two temperature sensors 24 and 26 are used.

The filter medium 21 may selectively use any one of a ceramic monolith filter, a ceramic fiber filter, or a metal mesh capable of collecting and forcibly regenerating particulate matter.

In addition, the lower limit and the upper limit of the filter medium 21 are in the range of 650 to 900 ° C.

The air tank 30 itself generates compressed air using an air compressor such as a compressor, or stores air supplied from the outside in a tank having a predetermined capacity.

The air supply valve 28 supplies or shuts off the air in the air tank 30 to the inlet of the filter 20 under the control of the ECU 18. The air supply valve 28 is turned on or off by an electrical signal input from the ECU 18. do.

Operation and scope of operation by the above configuration or configuration is not limited to use, which will be easily understood by those skilled in the art.

When explaining the operation of the present invention having such a configuration in detail, a certain amount of particulate matter generated in the combustion process of the engine 10 using diesel oil is accumulated in the filter medium 21 in the filter 20, the reference is regeneration It depends on the value of the viewpoint decision variable (e.g., set to K). The K value is calculated in the ECU 18 of the electronic control device for a vehicle by measuring the engine speed (RPM), the temperature of the exhaust gas, and the differential pressure between the front and rear ends of the filtration device, and the correlation is already known.

For example, when the particulate matter is collected until the K value is 1000 because regenerating the particulate matter trapped in the filter 20 when the K value is 1000 is suitable for complete safety regeneration, the filter 20 is actually used. Experiments confirmed that the amount of particulate matter entrapped in) was not always constant.

The reason for this is that factors affecting the calculation of the K value, such as the driving habits of the driver, the initial back pressure of the filter, the appearance of particulate matter, the state of the vehicle, the degree of aging of the engine or the amount of fuel injection, are different for each engine or vehicle. It is understood to be caused by the phenomenon.

Therefore, the K value as the regeneration point is only meant as an initial value. After the first regeneration, when the regeneration result, that is, when the maximum regeneration temperature and the safe complete regeneration temperature range is less than the regeneration start point K = 1000, α value is added to the next value. At the time of regeneration, more particulate matter is accumulated and regenerated than the previous regeneration, and if it is over the area, the filter medium is protected by the high temperature prevention control method, and the difference is fed back to feed back the difference, and the α value is subtracted from the starting point of K = 1000. In this case, less particulate matter is accumulated than the starting point, and the next regeneration is performed.

In one embodiment of the present invention, Figure 4 is a control flow diagram showing a method for adjusting the regeneration time of the diesel filter for diesel soot.

In step S100, the ECU 18 memorizes in advance the highest regeneration temperature Th during the regeneration of the filter medium 21. This memorizes the highest regeneration temperature initialized when the filter 20 is first mounted on the vehicle.

In step S101, after the exhaust gas discharged from the engine 10 flows into the filter 20 through the second exhaust valve 14, when the particulate matter is accumulated in the filter 20, the ECU starts to be regenerated. 18 determines whether the temperature sensed by the temperature sensors 24 and 26 is greater than the maximum regeneration temperature Th than T1 (about 900 ° C.), and if the maximum regeneration temperature Th is greater than T1, After subtracting α (for example, 100) from the set value set in S102), the following step is performed.

However, if the maximum regeneration temperature Th is not greater than T1, it is determined in step S103 whether the maximum regeneration temperature Th is less than T1 and greater than T2 (about 850 ° C). If the maximum regeneration temperature Th is smaller than T1 and larger than T2 in step S103, the next step is performed after subtracting α (for example, 50) from the set value set in step S104.

Further, in step S105, it is determined whether the maximum regeneration temperature Th is less than T2 and greater than T3 (about 600 DEG C), and if it is within the corresponding range, the set value set in step S106 is kept in the current state.

In addition, if it is determined in step S107 that the maximum regeneration temperature Th is less than T3 and greater than T4 (about 500 ° C.), then the set value set in step S108 is set to α (for example, 50). In addition, continue with the next step.

Further, in step S109, if it is determined by determining whether the maximum regeneration temperature Th is smaller than T4, α (for example, 100) is added to the set value set in step S110. In this way, the automatic determination and adjustment of the variable by the reflection of the regeneration time determination variable (K) induces a safe complete regeneration.

In the case of Figure 2 is determined by the initial regeneration time determination variable (K) value, and shows the regeneration pattern when it is continuously placed without re-regulation, it can be seen that the regeneration temperature continues to change. FIG. 3 is a characteristic graph of determining the initial regeneration time determination variable K value and feeding back the regeneration temperature immediately, and continuously adjusting the regeneration time determination variable K appropriately to realize safe complete regeneration.

As described above, the present invention solves the difficulty of artificially adjusting the regeneration start point every time by stabilizing the regeneration point determinant value naturally in the safe regeneration zone of the filter medium through the above process. If the regeneration process is repeated a number of times, the durability of the filter medium, that is, the back pressure characteristic of the filter medium is changed due to the change in the properties of the filter medium, which is different from the initial filter back pressure characteristic. Even if it changes itself and the value of regeneration time is different from the amount of filtered particulate matter, the regeneration time is always adjusted by regenerating the regeneration time with the previous regeneration result. It has an effect.

1 is a block diagram of an apparatus for adjusting the regeneration time of the filter for diesel fuel gas purification according to the present invention,

Figure 2 is a characteristic graph before adjusting the regeneration time of the diesel fuel purification filter applied in the present invention,

Figure 3 is a characteristic graph after adjusting the regeneration time of the diesel filter for diesel particulate filter applied in the present invention,

Figure 4 is a control flow diagram showing a method for adjusting the regeneration time of the diesel filter for diesel soot purification in accordance with the present invention.

♣ Explanation of symbols for main part of drawing ♣

10: engine 12, 14: exhaust valve

16: Silencer 18: ECU

20: filter 21: filter medium

22: Regenerator 24, 26: Temperature sensor

28: air supply valve 30: air tank

Claims (6)

Memorizing the highest regeneration temperature during regeneration of the filter, Judging whether the stored maximum regeneration temperature is above the set temperature T1 ° C; If the maximum regeneration temperature is greater than the set temperature T1 ℃ subtracting 100 from the set value, Determining whether the best regeneration temperature is less than the set temperature T1 ° C. and greater than T2 ° C .; Subtracting 50 from the set value if the maximum regeneration temperature is less than the set temperature T1 ℃ and greater than T2 ℃, Determining whether the best regeneration temperature is less than the set temperature T2 ° C and greater than T3 ° C, If the maximum regeneration temperature is less than the set temperature T2 ℃ and greater than T3 ℃ maintaining the set value as it is, Determining whether the best regeneration temperature is less than the set temperature T3 ° C. and greater than T4 ° C .; If the maximum regeneration temperature is less than the set temperature T3 ℃ and greater than T4 ℃, adding 50 to the set value, Determining whether the maximum regeneration temperature is less than the set temperature T4 ° C; If the maximum regeneration temperature is less than the set temperature T4 ℃ comprising the step of adding 100 from the set value of the regeneration point of the filter for diesel fuel purification. In the regeneration device of the filter for diesel soot purification, A first exhaust valve configured in an exhaust pipe connected to the exhaust manifold of the engine to control the exhaust gas discharged into the silencer; A second exhaust valve connected to the first exhaust valve in parallel to control the exhaust gas discharged to the filter; ECU for controlling the interruption of the first and second exhaust valve, A regeneration igniter which is configured at the front end of the filter and generates heat of a predetermined temperature by battery power under the control of the ECU to combust the filtered particulate matter; A temperature sensor which is built in one or more inside one side of the filter medium configured in the filter, detects the temperature of the filter medium, converts the detected temperature into an electrical signal, and outputs it to the ECU; An air tank that generates compressed air on its own or stores air of a predetermined capacity introduced from the outside; And an air supply valve for regulating the air in the air tank to the inlet of the filter under the control of the ECU. The apparatus of claim 2, wherein the regeneration igniter includes electricity, a burner, a supporting catalyst, and a supporting additive. The apparatus of claim 2, wherein the filter medium selectively uses any one of a ceramic monolith filter, a ceramic fiber filter, and a metal mesh capable of collecting and forcibly regenerating particulate matter. According to claim 2, wherein the temperature sensor is inserted in a predetermined number in the longitudinal direction of the filter medium, regeneration time adjustment device for the diesel soot purification filter for detecting the current temperature according to the inserted position. 5. The regeneration time adjusting device for a diesel particulate filter for purification of diesel fuel according to claim 2 or 4, wherein a lower limit and an upper limit of the filter medium have a range between 550 ° C and 900 ° C.

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