KR20200058170A - Method of Filter Regeneration Based On Soot Deposition Scope and Filter Protection System In Vehicle - Google Patents

Abstract

Provided is a soot graph-based filter regeneration method applied to a filter protection system (40) for a vehicle. According to the soot graph-based filter regeneration method, a controller (50) performs: a filter protection control of determining whether a filter is damaged due to filter regeneration prior to a filter regeneration operation by comparing soot deposition gradients of the filter by mileage with numerical values of soot over-deposition rates; a driver notification control of classifying filter damage into a filter warning and an emergency filter warning to notify a driver of the same; and a filter regeneration operation of performing the filter regeneration when a filter regeneration mileage set in a condition irrelevant to the filter damage is reached. Accordingly, it is possible to prevent damage to the filter, which is caused by a sudden increase in soot, by constantly checking the amount of soot deposition in addition to the mileage conditions when a vehicle is driving. In particular, whether the filter is normal or abnormal is determined by calculating soot deposition rates before reaching filter regeneration control by which the soot is removed when a target amount of soot deposition is reached, thereby preventing unnecessary filter regeneration control as well.

Description

Soot deposition method filter regeneration method and vehicle filter protection system {Method of Filter Regeneration Based On Soot Deposition Scope and Filter Protection System In Vehicle}

The present invention relates to a filter regeneration control, and in particular, to a vehicle filter protection system to which a soot sediment tilt filter regeneration method is applied to prevent unnecessary filter regeneration, which causes filter damage by identifying the amount of soot deposition outside the mileage condition.

In general, the post treatment exhaust system applied to vehicles (Post Treatment Exhaust Contamination Gas Decreasing System) collects and removes particulate matter and soot emitted from the engine by DPF (Diesel Particulate Filter) to each country. It satisfies the regulations of exhaust regulation.

In particular, the DPF system regenerates the filter efficiency by burning the soot attached to the filter by burning by fuel injection (ie, post injection), thereby regenerating the filter in which filter efficiency for capturing and removing particulate matter is maintained in an appropriate state. Apply logic.

For example, the filter regeneration logic applies a regeneration event to the soot accumulation amount of the filter, and the soot accumulation amount is confirmed as a time point at which a predetermined mileage is set as a mileage according to vehicle operation, and thus is used as a measure of post-injection for removing soot. The reason for this is that the soot accumulation amount of the filter can be set such that the detection value of the DPF's Particulate Matters (PM) sensor (or the differential pressure sensor that detects the internal pressure change in the DPF) is almost identical to the mileage mileage of normal vehicle driving conditions. do.

Therefore, the DPF system can always maintain the performance of removing harmful substances in exhaust gas even in a high speed / high load condition of a vehicle with filter regeneration efficiency through a filter regeneration logic.

Domestic published patent 10-2009-0036330 (2009.04.14)

However, the filter regeneration logic is a mileage-based regeneration event method, which has a limitation that it is impossible to prevent rapid soot deposition of a filter not based on mileage.

For example, a rapid increase in the amount of soot sedimentation that is not based on mileage can be generated in an exhaust gas recirculation system (EGR) that is applied to a vehicle together with a post-treatment system to recirculate exhaust gas to a turbocharger to improve engine performance. Intercooler hose breakage (eg puncture) may be the cause. The reason for this is that the perforation of the intercooler hose destabilizes the exhaust gas recirculation through the EGR system, resulting in a rapid burn in the engine.

As a result, the rapid increase in soot is deposited with the filter in the DPF, which inevitably causes the filter to break even during a very short driving period.

Furthermore, the driver who recognizes the filter damage due to engine warning, has no choice but to complain about the expensive filter maintenance, and in particular, when it is confirmed that the cause of the filter damage is caused by the failure of other parts from the DTC code during maintenance, the vehicle manufacturer's claim cost It has to be greatly increased.

For this reason, in recent years, a number of technical grafting attempts have been made to prevent filter damage that may be unnecessarily generated due to a correlation between the filter regeneration cycle and the amount of soot deposited.

In view of the above, the present invention prevents the filter from being damaged due to a sudden increase in soot by constantly grasping the amount of soot deposited outside the mileage condition when driving the vehicle, and in particular, regenerating the filter that removes soot when the target amount of soot is reached An object of the present invention is to provide a soot sediment tilt method filter regeneration method and a vehicle filter protection system that can prevent unnecessary filter regeneration control by using a normal / abnormal judgment by calculating the soot deposition rate before reaching control.

The filter regeneration method of the present invention for achieving the above object is calculated by the controller during operation of the vehicle soot over deposition rate indicating the soot deposition amount gradient for each mileage of the filter, and before the filter regeneration operation of the filter with the soot over deposition rate Characterized in that it includes; filter protection control to determine whether or not filter damage caused by filter regeneration and generate driver notification information.

In a preferred embodiment, the driver notification information is a filter damage warning according to an increase in the soot deposition amount of the filter.

As a preferred embodiment, the filter protection control, the soot deposition rate calculation period for the filter starts, the soot deposition amount of the filter is detected, the soot deposition rate calculation period according to the set period of the soot deposition rate calculation The filter diagnosis control is performed, and the numerical value of the soot over deposition rate is divided into a lower limit threshold value for filter warning and an upper limit threshold value for emergency filter warning, and counting of the number of filter warning entry counts starts with the lower limit value. Step, the filter warning entry count count is accumulated through repeated execution of the set cycle, and the filter warning condition count is accumulated to determine filter warning condition fulfillment.

In a preferred embodiment, the soot deposition rate calculation period is set not to exceed the filter regeneration mileage for the filter regeneration operation. The set period is divided into the driving distance according to the vehicle operation.

In a preferred embodiment, the filter diagnosis control starts the setting cycle when the initial diagnosis cycle is reached, the filter diagnosis conditions are switched, the soot excessive deposition rate is calculated, and the soot excessive deposition rate is a numerical value of the filter warning. The filter warning condition judgment for the emergency filter warning condition judgment for the emergency filter warning is performed.

In a preferred embodiment, the soot over deposition rate is calculated using {[(filter capacity * detected soot deposition amount / regeneration cycle mileage] * 100} as the filter soot over deposition rate determination formula. The reproduction cycle mileage is set to the same value as the setting cycle.

In a preferred embodiment, the determination of the filter warning condition satisfaction is continued until the accumulation of counts of the filter warning entry counts is greater than a count threshold.

In a preferred embodiment, the filter warning or the emergency filter warning converts the filter protection control into a driver notification control, and the driver notification control generates the driver notification information by warning lamp lighting or display display.

In a preferred embodiment, the filter regeneration operation is performed through entry into the mileage filter regeneration mode, and the mileage filter regeneration mode is set to a filter regeneration time point at which the set filter regeneration mileage is reached to burn the soot deposition amount of the filter.

And the vehicle filter protection system of the present invention for achieving the above object is a filter that determines the filter damage due to the filter regeneration before the filter regeneration operation by comparing the soot deposition gradient for each mileage of the filter with the numerical value of the soot over deposition rate Protection control, driver notification control to notify the driver by dividing the filter damage into a filter warning and an emergency filter warning, and a filter regeneration operation in which the filter regeneration is performed when the filter regeneration mileage set under conditions irrelevant to the filter damage is reached It characterized in that it includes a controller;

In a preferred embodiment, the controller is associated with the driver notification device, and the driver notification device notifies the driver of the filter warning or the emergency filter warning with a warning light or display.

In a preferred embodiment, the filter is built into the DPF, and the DPF constitutes a post-treatment system in which particulate matter and soot from the exhaust gas from the engine are captured and removed.

In a preferred embodiment, the engine is coupled with an EGR system that acts as an external cause to increase the amount of soot and sediment in the filter through the perforation of an intercooler hose through which exhaust gas flows.

The filter regeneration method applied to the vehicle filter protection system of the present invention implements the following actions and effects.

First, by applying the slope of the soot chart to the diagnosis condition of soot deposition, it is possible to accurately determine the cause of soot over-deposition of the filter due to the impact of blow (ie, the breakage of the intercooler hose of the EGR system). Second, it is possible to prevent unnecessary filter regeneration control by accurately or abnormally determining the filter before reaching the filter regeneration control. Third, filter regeneration control is performed only in the soot deposition condition of the mileage-based filter, thereby preventing unnecessary filter damage. Fourth, warning lights or frequent lighting of the display can be prevented by classifying the driver notification level by determining the soot deposition rate in two stages based on the characteristics of the excess deposition rate of the DPF. Fifth, the limitations of the mileage-based replay event method, which could not detect the rapid soot deposition of a filter not based on mileage, are fundamentally solved, so that driver claims against the post-processing system can be resolved. Sixth, by preventing unnecessary filter breakage, the performance of the post-treatment system is maintained at all times even in high-speed / high-load conditions of the vehicle, thereby obtaining reliability in meeting each country's exhaust regulations.

Figure 1 is a flow chart of the soot sediment tilt method filter regeneration method according to the present invention, Figure 2 is an example of a soot sediment tilt method filter regeneration method according to the present invention is applied to a vehicle filter protection system, Figure 3 is EGR according to the present invention Soot is deposited abnormally on the filter due to the effect of damage to the intercooler hose of the system, and FIG. 4 is an example in which the soot deposition amount of the filter does not show an excessively deposited state even with mileage-based filter regeneration control in the DPF according to the present invention. 5 is a leading example in which the soot and sedimentation of the filter is fundamentally blocked when an external cause occurs by the filter protection control of the filter diagnosis cycle in the DPF according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings, and as such examples, those skilled in the art to which the present invention pertains may be embodied in various different forms, and thus are described herein. It is not limited to the embodiment.

Referring to FIG. 1, the filter regeneration method includes filter protection control (S20 to S100), filter regeneration control (S110, S120) and driver notification control (S70-2, S100) for the soot deposition phenomenon of the filter during vehicle operation (S10). -1, S200).

As an example, the filter protection control (S20 to S100) enters the filter protection mode, so that the filter is diagnosed by repeating the set cycle. Detects phenomena caused by external causes, such as damage to the system) (e.g., intercooler hose breakage). The filter protection control (S20 to S100-1) regenerates the filter in the mileage filter regeneration mode, which means normal filter regeneration when the soot deposition amount of the filter is a set area based on vehicle driving. The driver notification control (S70-2, S100-1, S200) performs a warning display in which priority is divided into a filter warning (S100-1) and an emergency filter warning (S70-2) for the soot over deposition phenomenon of the filter. do.

In particular, the filter protection control (S20 to S100) improves the early detection effect of soot over deposition by detecting the soot over deposition rate with the soot deposition slope determined through the repeated execution result of the optimized setting cycle, and furthermore, the upper / lower limit of the soot over deposition rate The filter protection effect is further improved by classifying the soot over deposition rate that is abnormally high compared to the furnace setting cycle into emergency filter warnings (S70-1, S70-2) having priority over the filter warning (S100-1).

Therefore, the filter regeneration method is characterized by a soot deposition slope filter regeneration method.

Next, referring to FIG. 2, the vehicle 1 includes a filter protection system 40 together with an engine system 10 to which a post-treatment system 20 and an EGR system (Exhaust Gas Recirculation System) 30 are linked.

For example, the engine system 10 includes an engine 11 that generates power through intake air for combustion and exhaust gas discharge for exhaust. The post-treatment system 20 is installed in the exhaust line 20-1 through which the exhaust gas flows, DPF 21 for collecting / removing particulate matter and soot from the exhaust gas, and PM detecting the internal pressure of the DPF 21 (Particulate Matters) sensor 23, the injection injector 25 after fuel is injected to burn the soot deposited on the filter of the DPF (21). The EGR system 30 is rotated by the exhaust gas of the EGR line bypassed in the exhaust line 20-1 to convert the intake air into the compressed air that is highly compressed, the turbocharger 31 lowers the temperature of the supercharged air, and the engine 11 ) Includes an intercooler 33 equipped with an intercooler hose 33-1 to supply it to the combustion chamber.

In particular, the post-treatment system 20 is a diesel oxidation catalyst (DOC: Diesel Oxidation Catalyst), a complex oxidation catalyst (MOC: Multi Oxidation Catalyst) and a selective reduction catalyst (SCR) to increase the performance of removing harmful gases in the exhaust gas ) May be installed in the exhaust line 20-1.

For example, the filter protection system 40 includes a controller 50 and a driver notification device 60.

The controller 50 is the result of the breakage of the intercooler hose 33-1 of the EGR system 30 (eg, perforation 33-1A in FIG. 3) as a result of calculating the soot deposition rate for the filter of the DPF 21. The driver notification device 60 is operated by the driver notification signal, which is divided into a filter warning and an emergency filter warning, from the soot accumulation amount due to the same external cause, or a filter from the soot accumulation amount having a set area based on the mileage of the vehicle driving. Filter regeneration control is performed with the regeneration signal.

To this end, the controller 50 includes a data input device 51 and a filter protection map 53. The data input device 51 is an engine operation that includes the filter pressure detection value of the PM sensor 23, the injector operation information of the post injection injector 25, the engine speed of the engine 11 and the vehicle speed of the vehicle 1 Information, EGR system information including the EGR gas pressure of the EGR line or the supercharged air pressure of the intercooler hose 33-1 is detected as input data and provided to the controller 50. The filter protection map 53 establishes a set period for detecting the soot deposit amount of the filter (eg, mileage or time applied to the mileage), the upper / lower limit soot deposit value, the soot over deposition rate difference value, and the like in a table, and the controller Provided to the controller 50 as information for the driver notification signal of 50 and the filter regeneration signal. Therefore, the controller 50 further includes a logic processor associated with the data input device 51 and the filter protection map 53.

Furthermore, the controller 50 is provided with an engine ECU (Electronic Control Unit) or a post-processing system ECU (Electronic Control Unit) to perform normal filter regeneration control in the mileage filter regeneration mode consisting of reaching mileage according to the mileage of the vehicle 1. Can be linked. Therefore, the controller 50 controls the post injection amount control of the post injection injector 25 for filter regeneration control, vehicle mileage, soot collection state, vehicle operating time, exhaust gas flow rate, temperature difference between the filter before and after the engine. It can be shared by ECU or post-processing system ECU. Therefore, the controller 50 operates as a filter protection control driver.

The driver notification device 60 is composed of a warning light 61 and a display 63 provided in the driver's seat cluster. The warning light 61 is a lighting method using a bulb or a light-emitting diode (LED), and the display 63 is a text or picture display method using a screen.

Hereinafter, the filter regeneration method of the soot sediment tilt method of FIG. 1 will be described in detail with reference to FIGS. 2 to 5. In this case, the control subject is the controller 50, and the control target is the DPF 21 of the post-treatment system 20 and the post injection injector 25 and the warning light 61 or the display 63 of the driver notification device 60. .

The controller 50 recognizes the vehicle operation as in S10. Referring to FIG. 2, the controller 50 moves the vehicle 1 at an engine speed and a vehicle speed greater than 0 among engine driving information of the engine 11 transmitted as input data from the data input device 51. By confirming the vehicle operation is recognized.

Then, the controller 50 performs filter protection control as in S20 to S100. Referring to FIG. 2, the controller 50 utilizes filter pressure detection values, engine speed, vehicle speed, EGR gas pressure, or supercharged air pressure transmitted from the data input device 51 as input data as post-processing system information, In the filter protection map 53, a set cycle time associated with post-processing system information, an upper / lower limit soot deposition value, and a soot over deposition rate difference value are used.

From this, each step of the filter protection control (S20 to S100) enters the filter protection mode of S20, the post-processing system information detection step of S30, the filter diagnosis execution step of S40 to S70-1, and the number of filter warning entry times of S80. It is performed in the step of repeating the set diagnostic cycle of S90, the step of satisfying the filter warning condition of S100.

For example, the filter protection mode entry (S20) is a step of starting the soot deposition rate calculation period (T) with an automatic execution logic following the vehicle operation recognition of the controller 50. In this case, the soot deposition rate calculation period (T) is t1, t2, ... It is divided into setting cycles of, tn (n is an integer of 3 or more) and executed in the order of t1 to tn. Especially t1, t2,,… Each set cycle of, tn can be optimized by applying mileage or time, but the mileage-based DPF characteristic is applied. Therefore, when the driving distance is set to about 150 km, the setting cycle increases in the order of t1 at 300 km, t2 at 300 km, and t3 at 450 km, and is initialized when the filter regeneration mileage of the DPF 21 is reached under normal vehicle driving conditions. That is, when the filter regeneration mileage is 1500 km, the setting cycle is t1 (150 km) as the initial diagnosis cycle and t10 (1500 km) as the final diagnosis cycle. However, it is preferable to set the final diagnosis period to a value smaller than the filter regeneration mileage.

For example, the filter diagnosis (S40 ~ S70-1) is a filter diagnosis condition switching step of S40, an initial diagnosis cycle arrival determination step of S50, a filter soot over deposition rate calculation step of S60, a filter warning condition determination step of S70, S70- It is performed as the emergency filter warning condition judgment step of 1.

Specifically, the filter diagnosis condition switching (S40) is made by applying the initial diagnosis cycle as the first set cycle (t1) of the soot deposition rate calculation cycle (T), and the initial diagnosis cycle arrival determination (S50) is the first set cycle It consists of checking the mileage of the mileage applied to (t1) (e.g., after the vehicle has been diagnosed with an arbitrary filter, the vehicle 1 has traveled about 150 km).

Specifically, the filter soot over deposition rate calculation (S60) calculates the abnormal soot deposition amount of the filter in the DPF 21 due to an external cause.

In this case, the meaning of the filter soot excess deposition rate is as follows, and the calculation of the soot excess deposition rate is performed by a filter soot excess deposition rate determination formula.

For example, when the filter capacity of the DPF 21 is 3L, when the soot deposition amount of the filter is calculated to be about 6.5g during 150Km mileage mileage of the vehicle 1, the soot excess deposition rate is calculated as 13. At this time, the soot deposition amount calculation is calculated using the soot deposition amount table identified by the DPF manufacturer based on the pressure difference between the inside and outside of the DPF 21 detected by the PM sensor 23. In addition, the soot over deposition rate of 13 indicates a normal soot over deposition rate based on the mileage of the vehicle 1 while only the filter performance body of the DPF 21 is considered, and these values are provided by the DPF manufacturer.

On the other hand, Figure 3 illustrates an abnormal increase in the soot over deposition rate of the DPF 21 in the presence of an external cause such as a perforation 31-1A of the intercooler hose 31-1. As shown, the perforation 31-1A generated in the intercooler hose 31-1 of the EGR system 30 acts as an external cause, so that the amount of soot deposited of 1.3g per mile of 4.2km at a filter capacity of 3L Increasing is confirmed by driving experiment. From these results, the soot over-deposit rate was rapidly calculated to be 30.9 compared to 13, which represents the normal value, so that the external cause due to the perforation (31-1A) of the intercooler hose (31-1) was abnormally sooted in the filter of the DPF (21). It is proved to be the cause of the increase.

Therefore, the filter soot over deposition rate determination equation applied to the filter soot over deposition rate calculation (S60) is as follows.

Filter soot over deposition rate judgment formula: W = [(X * Y) / Z] * 100

Here, “W” is the soot over deposition rate (dimensionless), which indicates the slope of the soot deposition amount for each mileage of the filter. “X” is the filter capacity (in litter units), which is variable according to the specifications of the DPF 21, and “Y” Is calculated using the soot sediment amount table set as the pressure difference between the inside and outside of the DPF 21 detected by the PM sensor 23 in the amount of soot deposited (in weight (g)), and “Z” is the filter's regeneration cycle mileage ( Km unit) is set to about 150Km, and “*” is a multiplication sign of two values. In particular, since the soot over deposition rate W is dimensionless, each of the filter capacity X, the detected soot deposition amount Y, and the regeneration cycle mileage Z is calculated by applying only the numerical value.

As a result, the soot over deposition rate W is calculated based on the detected soot deposition amount Y at a regeneration cycle mileage of about 150 km that reaches the first set period t1 when the vehicle 1 is in operation. Therefore, the soot over deposition rate W is inevitably calculated to exceed 13 when the perforation 31-1A of the intercooler hose 31-1 acts as an external cause, compared to when 13 is the normal soot deposition rate. I have no choice but to.

Referring back to FIG. 1, the filter warning condition determination (S70) and the emergency filter warning condition determination (S70-1) distinguish the filter protection level for the soot over deposition rate (W). Therefore, the soot over deposition rate W allows the driver notification information to be generated as a filter warning or an emergency filter warning before the filter regeneration operation of the filter.

In the filter warning condition determination (S70), a filter warning condition determination expression is applied.

Filter warning condition judgment formula: W> W_1

Here, “>” is a symbol indicating the size relationship between the two values, and “W_1” is a low threshold of soot over deposition rate, which may be set to about 13 to 16 or more, but is preferably specified to be about 15.

As a result, if the soot excess deposition ratio W calculated in the filter soot excess deposition ratio calculation S60 is smaller than the lower limit threshold value W_1, the filter diagnostic condition is returned to the step S40 to repeat the filter diagnostic conditions. On the other hand, if the soot excess sedimentation rate W calculated in the filter soot excess sedimentation rate calculation S60 is greater than the lower limit threshold value W_1, the emergency filter warning condition determination step S70-1 is entered.

In the emergency filter warning condition determination (S70-1), the emergency filter warning condition determination formula is applied.

Emergency filter warning condition judgment formula: W> W_2

Here, “>” is a symbol indicating the size relationship between the two values, and “W_2” is a high threshold of soot over deposition rate, which may be set to about 20 to 30 or more, but is preferably specified as about 25.

As a result, if the soot excess deposition ratio W calculated in the filter soot excess deposition ratio calculation (S60) is greater than the upper limit threshold value W_2, it enters the driver notification control (S70-2, S200) by switching to the emergency filter warning of S70-2. do. On the other hand, if the soot excess sedimentation rate W calculated in the filter soot over deposition rate calculation S60 is greater than the lower limit threshold value W_1 and smaller than the upper limit threshold value W_2, the filter warning entry count count of S80 is entered.

Specifically, the filter warning entry count count S80 uses the filter diagnosis condition count count formula.

Filter diagnosis condition count count formula: N = N + 1

Here, “N” is set to 1 as the number of occurrences of the lower limit threshold value of the soot over deposition rate W in the initial diagnosis period t1. “N + 1” means that “N” is increased to 2, ..., n (n is an integer greater than or equal to 3) in accordance with the number of repetition cycles.

Specifically, the set diagnostic cycle repetition (S90) is t1, t2,, which is the soot deposition rate calculation period (T) set in the filter protection mode entry (S20). , tn (n is an integer of 3 or more). Therefore, the filter count condition count expression is t1, t2, ... , tn (n is an integer greater than or equal to 3) reflects the increase in the number of occurrences of the lower limit threshold value of the soot over deposition rate W according to the execution of the setting cycle. That is, when the lower limit threshold value of the soot over deposition rate W is generated in the setting period t2, “N = N + 1” means “2 (number of times due to the t2 setting cycle) = 1 (number of times due to the t1 setting cycle) + 1 ”.

Specifically, the filter warning condition fulfillment (S100) consists of reaching the number of occurrences of the soot over deposition rate W, and the filter warning condition fulfillment formula is applied.

Filter warning condition: K> K_1

Here, “K” is the number of counts of filter diagnosis conditions, and “K_1” may be set to about 3 to 5 as a count threshold, but is preferably specified as about 2 or 3.

As a result, when the filter warning condition count count (K) is greater than the count threshold (K_1) in the filter warning condition (S100), the driver alert control (S100-1, S200) is entered by switching to the filter warning in S100-1. On the other hand, if the number of times the filter diagnosis condition count (K) is less than the filter threshold condition (K_1) when the filter warning condition is satisfied (S100), it is switched to the filter regeneration control (S110, S120).

Specifically, the filter regeneration control (S110, S120) is performed as a filter regeneration mileage arrival confirmation step in S110 and a mileage filter regeneration mode entry step in S120. Referring to FIG. 2, the controller 50 determines the arrival of the filter regeneration mileage (or any set filter regeneration mileage) of the DPF 21 manufacturer from the input data of the data input device 51 or the filter protection map 53. The filter regeneration mileage arrival (S110) is recognized from the table. Therefore, the controller 50 returns to the filter protection mode of S20 when the filter regeneration mileage is not reached, while when the filter regeneration mileage is reached, outputs the filter regeneration signal to the mileage filter regeneration mode (S120), thereby causing the DPF 21 for filter regeneration. The post-injection injector 25 is operated.

Referring to Figure 4, when 150Km mileage, 19-20g soot sediment, 13 soot over deposition rate ① as a reference value of 240 ~ 250Km mileage, 17 ~ 18g soot deposition amount, 7-8 soot over deposition rate, ② 160 ~ 170Km mileage, 15 ~ 16g soot deposit, 9 ~ 10 soot over deposition rate, ③ indicates 220 ~ 230Km mileage, 17 ~ 18g soot deposition amount, 7 ~ 8 soot over deposition rate, respectively. Therefore, the filter regeneration control (S110, S120) experimentally proves that the filter performance is maintained only by regenerating the mileage filter of the existing method in a state in which the external cause for generating soot and sedimentation of the filter is removed.

Specifically, the driver notification control (S70-2, S100-1, S200) is the emergency filter warning stage of S70-2, the warning lamp ON or display ON stage of S200 or the filter warning stage of S100-1, the warning lamp ON or display of S200 It is performed in the ON phase.

Referring to FIG. 2, the warning light ON is the lighting of the light using the warning light 61, while the display ON is the EGR system 30 that brings the soot and sedimentation of the filter to the driver by displaying characters or pictures using the display 63 ).

5, A, B, and C are examples of soot over deposition rate as a slope diagram.

For example, A is a normal soot over deposition rate (eg, 13) based on the mileage of the vehicle 1 in a state in which only the filter performance body of the DPF 21 is considered, and in this case, the normal mileage filter regeneration mode (S120) is applied. Perform a filter regeneration operation.

 For example, B is an abnormal soot over deposition rate (e.g., 15 or more or 25 or more) that causes damage to the EGR system 30, such as perforation 31-1A of the intercooler hose 31-1, as an external cause. Filter warning operation to which the notification control (S70-2, S100-1, S200) is applied is performed.

For example, C is a soot excess sedimentation rate applied between the soot excess sedimentation rate of A and the soot excess sedimentation rate of B and is applied as a margin range for holding judgment on the filter regeneration operation and the filter warning operation. The reason for the application of the margin range is to reflect that the degree of soot over deposition rate may be larger or smaller than A and B according to the performance and specifications of the DPF 21.

Therefore, the driver notification control (S70-2, S100-1, S200) can fundamentally block the filter regeneration that causes the filter damage of the DPF 21 in a situation in which an external cause causing soot and sedimentation occurs.

As described above, the soot chart method filter regeneration method applied to the vehicle filter protection system 40 according to the present embodiment compares the soot deposition amount gradient by mileage of the filter with the numerical value of the soot over deposition rate by the controller 50 Filter protection control to judge filter damage according to filter regeneration before filter regeneration operation, driver notification control to notify the driver by dividing the filter damage into filter warnings and emergency filter warnings, and regeneration of filters set under conditions independent of the filter damage When the mileage is reached, the filter regeneration operation to perform the filter regeneration is performed to constantly detect the soot deposition amount in addition to the mileage conditions when driving the vehicle, thereby preventing the filter from being damaged due to a rapid soot increase, especially when the target soot deposition amount is reached Unnecessary filter regeneration control can also be prevented by using normal / abnormal judgment by calculating the soot deposition rate before reaching the filter regeneration control in which removal is performed.

1: Vehicle 10: Engine system
11: Engine 20: Post-treatment system
20-1: Exhaust line 21: DPF (Diesel Particulate Filter)
23: PM (Particulate Matters) sensor
25: post injection injector
30: EGR system (Exhaust Gas Recirculation System)
31: turbocharger 33: intercooler
33-1: intercooler hose 33-1A: punched
40: filter protection system 50: controller
51: data input device 53: filter protection map
60: driver notification device 61: warning light
63: display

Claims (17)

A filter protection control for generating a soot over deposition rate of a filter by a controller during vehicle operation, and determining whether a filter is damaged due to filter regeneration before the filter regeneration operation of the filter by the soot accumulation rate;
Filter regeneration method characterized in that it is included.
The filter regeneration method according to claim 1, wherein the driver notification information is a filter damage warning according to an increase in the soot deposition amount of the filter.
The filter regeneration according to claim 1, wherein the filter protection control divides the numerical value of the soot over deposition rate into a low threshold and a high threshold to change the driver notification information. Way.
The method according to claim 3, wherein the filter protection control, the soot deposition rate calculation period for the filter is started, the soot deposition amount of the filter is detected, the soot deposition rate calculation period according to the set period of the soot deposition rate calculation Filter diagnosis control is performed, applying the lower threshold to the filter warning, applying the upper threshold to the urgent filter warning, and starting counting the number of filter warning entries into the lower threshold, the setting cycle The step of accumulating the filter warning entry count count by repeating the execution, and the step of determining the filter warning condition fulfillment by accumulating the filter warning entry count count.
Filter regeneration method characterized in that it is performed as.
The method according to claim 4, wherein the soot deposition rate calculation period is set so as not to exceed the filter regeneration mileage for the filter regeneration operation.
The filter regeneration method according to claim 4, wherein the set period is divided into a driving distance according to vehicle operation.
The method according to claim 4, wherein the filter diagnosis control, when the initial diagnosis cycle is reached, starting the setting cycle, switching the filter diagnosis conditions, calculating the soot over deposition rate, the soot over deposition rate as the numerical value of the filter warning Filter warning condition determination for the emergency filter warning condition determination for the emergency filter warning is made
Filter regeneration method characterized in that it is performed as.
The filter regeneration method according to claim 7, wherein the soot excessive deposition rate is calculated using {[(filter capacity * detected soot deposition amount / regeneration cycle mileage] * 100} as a filter soot excess deposition rate determination formula.
The method according to claim 8, wherein the regeneration cycle mileage is set to the same value as the setting cycle.
The method according to claim 4, wherein the determination of the filter warning condition satisfaction is continued until the cumulative count of the filter warning entry count is greater than a count threshold.
The filter according to claim 4, wherein the filter warning or the emergency filter warning converts the filter protection control into a driver notification control, and the driver notification control generates the driver notification information by warning lamp lighting or display display. How to play.
The method according to claim 1, wherein the filter regeneration operation is performed through entering the mileage filter regeneration mode, and the mileage filter regeneration mode is characterized in that the set filter regeneration mileage is reached as a filter regeneration time point.
The filter regeneration method according to claim 12, wherein the filter regeneration operation burns the soot deposition amount of the filter.
Filter protection control that judges the filter damage caused by filter regeneration before the filter regeneration operation by comparing the slope of the soot deposition amount by mileage of the filter with the numerical value of the soot over-deposition rate. A controller for notifying the driver of the driver and performing a filter regeneration operation for performing the filter regeneration when the filter regeneration mileage set in a condition irrelevant to the filter damage is reached;
Vehicle filter protection system comprising a.
The vehicle filter protection system according to claim 14, wherein the controller is associated with a driver notification device, and the driver notification device notifies the driver of the filter warning or the emergency filter warning with a warning light or a display.
The method according to claim 14, wherein the filter is built in a DPF (Diesel Particulate Filter), and the DPF constitutes a post-treatment system in which particulate matter and soot from exhaust gas from the engine are collected and removed. Vehicle filter protection system.
The vehicle filter protection according to claim 14, wherein the engine is connected with an exhaust gas recirculation system (EGR), which acts as an external cause of increasing the soot and sedimentation amount of the filter through the perforation of an intercooler hose through which exhaust gas flows. system.

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