When S poison recovery control is executed, in which a lean period for raising the floor temperature of an NSR catalyst and a rich period for enriching the exhaust air-fuel ratio are repeated, the amount of late post-injection in the lean period is integra...

An exhaust purification apparatus of an engine, which can regulate the temperature (Te1) of an exhaust purification catalyst (52) appropriately and which can release components of an exhaust efficiently by a regeneration process, is provided. When the rege...

The present detector for detecting sulfur components comprises a storage portion for storing SO x and NO x in the exhaust gas passing through an exhaust passage, in which the more an amount of stored SO x increases, the more an amount of NO x that can be s...

The method involves setting a long lean period (18) for increasing oxygen storage capacity parameter of a nitrogen oxide trap, where the long lean period has duration that ranges between 20 and 60 seconds. An end of the short lean period (17) is determined...

An exhaust purification system of an internal combustion engine includes an NO X storage reduction catalyst device which is arranged in an engine exhaust passage. The NO X storage reduction catalyst device stores SO X simultaneously with NO X . When the st...

The processing of exhaust gases of a heat engine is checked by checking the modeling of the trap by measuring a quantity of the nitrogen oxides stored in the trap by means of a sensor, comparing the measured quantity of nitrogen oxides to a modeled quantit...

In an internal combustion engine (2), during sulfur release control for permitting an exhaust purification catalyst to recover from a sulfur poisoned state, a richening period, in which fuel is supplied to exhaust gas, and a non richening period, in which ...

In an exhaust purification system of an internal combustion engine (1) that includes a NOx catalyst (16) for occluding and reducing NOx in exhaust, when removing SOx deposited in the NOx catalyst, a concentration of sulfur in a fuel is detected, and an amo...

To provide an exhaust gas purifying method and an exhaust gas purifying system capable of efficiently purging the sulfur accumulated in a NOx occluding reduction type catalyst, while preventing fuel consumption from deteriorating and preventing NOx, HC, an...

The process for operating a vehicle having a lean running engine comprises forming a status signal depending on the value of the variable quantity, storing and displaying the status signal for introducing an operating method of the engine for passive desul...