초록 ▼

A process is proposed for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal combustion engine with a precatalyst and a particulate filter, in which process the afterinjection NE is performed as a function of the temperature in the area of the precatalyst Tcat and of the state

A process is proposed for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal combustion engine with a precatalyst and a particulate filter, in which process the afterinjection NE is performed as a function of the temperature in the area of the precatalyst Tcat and of the state of charging of the particulate filter. Since this process operates with especially high efficiency in heretofore critical short-distance operation of diesel internal combustion engines, the strict requirements of future legislation relating to exhaust gas emissions can immediately be met.

대표청구항 ▼

1. A process for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal injection with a precatalyst and a particulate filter, the afterinjection NE being performed as a function of the temperature in the area of the precatalyst Tcat and the state of charging of the particulate fi

1. A process for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal injection with a precatalyst and a particulate filter, the afterinjection NE being performed as a function of the temperature in the area of the precatalyst Tcat and the state of charging of the particulate filter, wherein the state of charging of the particular filter is indicated by means of a counter Z and the afterinjection NE is permitted only after a specific counter reading Zreg corresponding to a prescribed state of charging has been reached, and the level of the counter Z is increased if the mean regeneration temperature TRM situated between the upper regeneration temperature TRO and the lower regeneration temperature TRU is not reached within a specific time period tstart after a cold start of the diesel internal combustion engine.2. The process as defined by claim 1, wherein the counter level is progressively lowered when the mean regeneration temperature TRM situated between the upper regeneration temperature TRO and the lower regeneration temperature TRU is exceeded for a specific sum of time tsum of established time intervals tint.3. A process for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal injection with a precatalyst and a particulate filter, the afterinjection NE being performed as a function of the temperature in the area of the precatalyst Tcat and the state of charging of the particulate filter, wherein the state of charging of the particular filter is indicated by means of a counter Z and the afterinjection NE is permitted only after a specific counter reading Zreg corresponding to a prescribed state of charging has been reached, and the level of the counter Z is increased in the event of extreme short-distance operation.4. The process as defined by claim 3, wherein the counter level is progressively lowered when the mean regeneration temperature TRM situated between the upper regeneration temperature TRO and the lower regeneration temperature TRU is exceeded for a specific sum of time tsum of established time intervals tint.5. A process as defined for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal injection with a precatalyst and a particulate filter, the afterinjection NE being performed as a function of the temperature in the area of the precatalyst Tcat and the state of charging of the particulate filter, wherein the state of charging of the particular filter is indicated by means of a counter Z and the afterinjection NE is permitted only after a specific counter reading Zreg corresponding to a prescribed state of charging has been reached, and the counter level is progressively lowered when the mean regeneration temperature TRM situated between the upper regeneration temperature TRO and the lower regeneration temperature TRU is exceeded for a specific sum of time tsum of established time intervals tint.6. The process as defined in claim 5, wherein the level of the counter Z is lowered as a function of temperature.7. The process as defined by claim 6, wherein the afterinjection NE must not exceed a specific period of time tlimit.8. The process as defined by claim 7, wherein repeated afterinjection NE may be performed only after expiration of a specific period of time tpause.