KR20080054819A - Apparatus for regeneration catalyzed particulate filter of diesel vehicle and method thereof - Google Patents

Abstract

An apparatus for regenerating a catalyzed particulate filter of a diesel vehicle and a method thereof are provided to determine a regeneration period of the catalyzed particulate suitably for the driving conditions of the diesel vehicle. An apparatus for regenerating a catalyzed particulate filter of a diesel vehicle comprises a controller(200), which receives pressure information of an inlet and an outlet of a catalyzed particulate filter(100) from first and second pressure sensors(101,102) installed at both sides of the catalyzed particulate filter. The controller controls the fuel/air ratio of an engine(10) according to the driving condition of the diesel vehicle. The controller raises the temperature of exhaust gas to burn particulate materials collected in the catalyzed particulate filter, thereby regenerating the catalyzed particulate filter. The controller determines the regeneration period of the catalyzed particulate filter by analyzing a traveling distance, an engine operation time and a fuel consumption ratio.

Description

 Apparatus For Regeneration Catalyzed Particulate Filter Of Diesel Vehicle And Method Thereof}

1 is a schematic configuration diagram of an intake and exhaust device mounted on a diesel vehicle according to an embodiment of the present invention.

2 is a flowchart of regeneration of a particulate filter in a diesel vehicle according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: engine 20: oxygen temperature sensor

30: turbocharger 50: oxidation catalyst

100: soot filtration device 200: control unit

The present invention relates to a soot filtration device mounted on a diesel vehicle, and more particularly, to collect particulate matter such as soot contained in exhaust gas and filtering particulate matter (PM) that is discharged into the atmosphere. Regeneration of Soot Filter in Diesel Vehicles with Variable Control of Regeneration Cycle Applied to Driving Conditions by Applying Factor Values by Operation Section and Factors by Shear Temperature of Soot Filter to Calculate Regeneration Cycle of Filtered Particulate Filter (CPF) An apparatus and a method thereof are provided.

Despite the excellent fuel efficiency and output, diesel engines are burned in a state where the excess air ratio is high, and therefore, unlike gasoline engines, the exhaust gas generates less carbon monoxide (CO) or hydrocarbon (HC), while nitrogen oxides (Hereinafter referred to as "NOx") and the soot particulate matter (PM) such as soot has a drawback that considerably.

Although the reduction of particulate matter (PM) is achieved through combustion control, the particulate matter (PM) and Nox have a mutually opposite relationship, so reducing the Nox increases the particulate matter (PM) and increases the particulate matter. Reducing the material PM, on the contrary, increases the number of Nox, resulting in a difficult situation in controlling both of them simultaneously.

In particular, in recent years, particulate matter (PM) has been reported in various media as the most important main cause of air pollution, and cause many harm to the human body.

Therefore, the diesel vehicle is equipped with a soot filtration device as an aftertreatment device in the exhaust system in order to remove particulate matter (PM) such as soot discharged from the engine.

The particulate filter is periodically regenerated using the information of the pressure sensors disposed at both ends of the collected particulate matter (PM) is more than the reference amount or the fuel consumption and the engine operating time based on a certain mileage If the condition is satisfied, the playback operation is executed.

The periodic regeneration conditions are set according to the conditions shown in Table 1 below.

The regeneration of the soot filtration device is carried out by raising the combustion temperature to a predetermined temperature, preferably 600 ° C. or higher by a main injection retard or a post injection control to remove particulate matter (PM) deposited in the CPF. It burns and regenerates, and it collect | recovers particulate matter PM again, and functions to reduce discharge | emission of soot.

Vehicles have various characteristics depending on the region and season. However, the periodic regeneration method determines the uniform regeneration time without considering these various characteristics, so that the regeneration efficiency, viscosity of engine oil, fuel consumption rate, etc. It causes a lot of adverse effects on.

As a result of the experiment, it was confirmed that the regeneration occurred about 230km faster than the intended 1000km regeneration period.In this case, even though the regeneration distance did not reach the target, the engine operation time was continuously accumulated due to many children or low speed sections. It is a phenomenon that occurred.

In addition, since the exhaust temperature is increased in proportion to the intake air temperature in a region with high intake air temperature, such as heat, the soot amount is not collected as a condition for regeneration, but the regeneration operation is confirmed.

Therefore, the determination of the uniform regeneration cycle, which is determined by the mileage, the engine running time, and the fuel consumption, leads to a shortening of the regeneration cycle, which leads to a decrease in the viscosity of the oil and an adverse effect on the fuel consumption rate.

The present invention has been invented to solve the above problems, the purpose of which is to calculate the regeneration cycle of the soot filtration device in diesel vehicles, the factor value and the soot filtration by driving intervals on the conditions of mileage, engine running time and fuel consumption The shear temperature factor of the device is further applied to determine the proper operation conditions.

The present invention for realizing the above object is a turbocharger for charging the intake air with the energy of the exhaust gas and an oxidation catalyst for removing harmful substances contained in the exhaust gas, the rear end of the oxidation catalyst to collect soot In a diesel vehicle comprising a soot filtration device and a control unit for controlling the regeneration of the soot filtration device,

The control unit determines the periodic regeneration time of the smoke filtration device by further applying a factor value for each driving section and a factor value for each front end temperature of the smoke filtration device on conditions such as driving distance, travel time and fuel consumption.

In addition, the present invention is the process of learning and storing the vehicle speed and the mileage, the travel time, the fuel consumption and the temperature of the front end of the smoke filter according to the driving of the vehicle; Dividing each driving section with respect to the stored learning value and extracting a factor value for each driving section and a factor value for each shear temperature of the smoke filter; And determining the regeneration time of the soot filtration device by further applying the factor value for each driving section and the factor value for each shear temperature to the conditions of mileage, running time, and fuel consumption.

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

1 is a schematic configuration diagram of an intake and exhaust device mounted on a diesel vehicle according to the present invention.

As shown, the impeller 31 of the turbocharger 30 is mounted at a predetermined position of the exhaust manifold for discharging the exhaust gas combusted by the engine 10, and the impeller 31 is operated by the energy of the exhaust gas. And thus the turbine 32 mounted to the intake manifold is operated.

Therefore, the intake air is supercharged by the operation of the turbine 32 and supplied to the engine 10.

The rear end of the impeller 31 is equipped with an oxidation catalyst 50 made of a catalyst such as platinum (Pt), palladium (Pd), and the like to remove hydrocarbons and carbon monoxide by oxidation using oxygen contained in exhaust gas. do.

The oxidation catalyst 50 is equipped with an oxygen sensor 51 to detect the concentration of oxygen contained in the exhaust gas so that it is possible to determine whether the combustion is carried out in a lean air fuel ratio or a rich air-fuel ratio.

At the rear end of the oxidation catalyst 50, particulate matter (PM) discharged from the engine 10 is collected by a filter and deposited, and the particulate filter (PM) is burned and regenerated under periodic regeneration conditions. The device 100 is mounted.

The first pressure sensor 101 and the second pressure sensor 102 are mounted at both ends of the soot filtration device 100, and the inlet pressure information and the outlet pressure information of the soot filtration device 100 are transferred to the controller 200. to provide.

In addition, the temperature sensor 20 is mounted at the front end of the particulate filter 100 to provide the temperature information of the front end to the control unit 200.

The control unit 200 controls the general operation of the air-fuel ratio control of the engine 10 according to the operating conditions, and the first pressure sensor 101 and the second pressure sensor 102 mounted at both ends of the soot filtration device 100. Analyze the amount of deposition from the pressure difference (ΔP) of), and when the regeneration conditions of the particulate filter 100 are satisfied, the exhaust gas concentration is increased by increasing the engine combustion temperature through the late injection control or the post injection control. The particulate matter PM is burned by raising the temperature to regenerate the particulate filter 100.

In addition, the controller 200 analyzes the mileage, the engine running time and fuel consumption to determine the periodic regeneration time of the soot filtration apparatus 100. At this time, extracting the factor value for each driving section from the set map table and filtering the soot And extracting a factor value according to the shear temperature of the apparatus 100 to determine the periodic regeneration time.

The factor value for each driving section is set as shown in Table 2 below, for example.

Factor by driving section Average speed 0 10 30 40 … Factor value 0.8 0.85 0.9 1.0 …

In addition, the factor value for each shear temperature of the particulate filter is set as shown in Table 3 below, for example.

Soot filtration device shear temperature factor Average temperature 200 300 400 … Factor value 1.0 1.0 0.9 …

Referring to Figure 2 with respect to the regeneration operation of the particulate filter in the present invention including the function as described above are as follows.

When the engine start of the diesel vehicle is maintained on, the control unit 200 may control the vehicle speed, the mileage, the temperature of the coolant, the running time, and the first and second pressure sensors 101 mounted at both ends of the smoke filtration device 100 ( General state information of the vehicle such as the information of 102 is detected (S101) (S102).

Then, the pattern of each driving section is analyzed to extract factor values for each driving section from the map table set as shown in Table 2 above (S103).

In addition, the front end temperature of the soot filtration device 100 is detected through the temperature sensor 103 to extract a factor value according to the temperature condition from the map table set as shown in Table 3 above (S105) (S106).

Subsequently, the regeneration condition for the particulate filter 100 is applied to the driving distance, the driving time, and the fuel consumption information by applying the extracted factor value for each driving section and the factor value for each shear temperature of the particulate filter 100. It is determined whether to satisfy (S107).

The driving section is accumulated at intervals of 1 second, and the accumulated value is multiplied by the factor value to reflect the driving condition.

That is, in the case of the regeneration cycle according to the driving distance, the distance reaching the regeneration condition determined as the average condition is accumulated by multiplying the factor value according to the shear temperature of the particulate filter 100.

In addition, when the intake temperature is high or the load temperature of the soot filtration device 100 becomes higher than the entry of the CRT section due to the high load operation, the distance regeneration period is variably adjusted by multiplying by a factor value smaller than one.

For example, when driving under a lot of CRT intervals, 1 + 1 + 1 + + 1 = 1000 is 1 + 1 + [1 * 0.9 + 1 * 0.9 +. + 1 * 0.9], which is different from the general case of playing. Playback starts at + 1 = 1000 ([] is the CRT interval).

In this case, in the CRT section, 0.9 (Yes) is multiplied and accumulated, so that the reproduction can be effected more than 1000km.

That is, the distance reproduction period is determined depending on how long the CRT interval exists.

Similarly, when the periodic regeneration is entered by the engine operating time, the regeneration period is determined by multiplying the factor by the factor of the accumulated time value in the section of the idle section or the vehicle speed that is low enough to creep.

In other words, if one second is maintained in the idle section, it is not simply accumulating one second but multiplying the factor value to accumulate time for the driving condition.

Since the children are a section where only time increases while the distance does not increase, and soot is the least accumulated section, it is necessary to increase the time regeneration period when there are many idle sections or low speed regions.

If it is determined in step S107 that the periodic regeneration conditions for the soot filtration device 200 are not satisfied, the process returns to step S102. If the periodic regeneration conditions are satisfied, the engine is burned through the late injection control or the post injection control of the main injection timing. By raising the temperature of the exhaust gas by raising the temperature, the collected particulate matter PM is burned to regenerate the particulate filter 100 (S108).

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

As described above, the present invention further stably includes the temperature conditions for each section and the shear temperature of the smoke filtration device in determining the cyclic regeneration of the smoke filtration device in the diesel vehicle. It is expected that the reproducing period can be increased, thereby preventing unnecessary repetitive operations of the reproducing control.

Claims (3)

A turbocharger that supercharges intake air with the energy of the exhaust gas, an oxidation catalyst that removes harmful substances contained in the exhaust gas, a soot filtration device installed at the rear end of the oxidation catalyst and collecting soot, and regeneration of the soot filtration device. In a diesel vehicle including a control unit for controlling, The control unit may further determine the periodic regeneration time of the smoke filtration device by further applying a factor value for each driving section and a factor value for each front end temperature of the smoke filtration device to conditions such as driving distance, travel time and fuel consumption. Regeneration device of soot filtration device in vehicle. The method of claim 1, The control unit is a regeneration device of a soot filtration device in a diesel vehicle for regenerating the soot filtration device through the late control or post injection control of the main injection timing when the periodic regeneration conditions of the soot filtration device is satisfied. Learning and storing the vehicle speed, mileage, travel time, fuel consumption, and front end temperature of the smoke filtration device according to the operation of the vehicle; Dividing each driving section with respect to the stored learning value and extracting a factor value for each driving section and a factor value for each shear temperature of the smoke filter; A method for regenerating a particulate filter in a diesel vehicle, comprising: applying a factor value for each driving section and a factor value for each shear temperature to conditions of a mileage, a traveling time, and a fuel consumption.

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