Abstract:
The invention provides a method for determining the loading of a particulate filter, in particular of a particulate filter arranged in the exhaust-gas purification system of a diesel engine. First of all, a characteristic diagram for the particulate filter in a known state of loading is provided, and an artificial neural network is trained using this characteristic diagram. It is preferable for the characteristic diagram to describe the pressure difference caused by the filter as a function of the exhaust-gas temperature and of the exhaust-gas mass flowing through the filter. The loading of the particulate filter can then be determined by the artificial neural network from measured variables which characterize the operating state of the engine, such as the pressure difference caused by the filter, the exhaust-gas temperature and the exhaust-gas mass flowing through the filter.
Abstract:
L'invention concerne un procédé de détermination en temps réel de la masse de particules présente dans un filtre à particules (3) équipant la ligne d'échappement (2) d'un moteur à combustion interne (1). A partir des données d'entrées suivantes: la température T(t) des gaz d'échappement à l'entrée du filtre, concentrations en oxygène [ O 2 (t) ] et en oxydes d'azote [ NO x (t) ] des gaz d'échappement entrant dans le filtre, on calcule, en utilisant les lois de cinétique des réactions chimiques de combustion des particules, la vitesse de combustion V(t) des particules dans le filtre à particules. Puis à partir de cette vitesse V(t) , de la vitesse démission de particules du moteur F(t) et de la masse de particules présente dans le filtre, m c (t-Δt) , obtenue lors du cycle d'opérations précédent à l'instant t-Δt , on calcule la masse de particules présente sur le filtre, m c (t) : m c (t) = m c (t-Δt) + [ F(t) - V(t) ] * Δt .
Abstract:
In the case where an operating state of an internal combustion engine (1) belongs to a filter forced recovery region, filter forced recovery is performed (S106) when an amount of particulate matter deposited in a filter (20) becomes equal to or larger than a predetermined amount (S0). In the case where the operating state of the internal combustion engine (1) belongs to a filter continuous recovery region, the filter forced recovery is performed (S110) when the operating state of the internal combustion engine (1) continues to belong to the filter continuous recovery region for a predetermined time (T0) or longer.
Abstract:
The invention relates to a method of cleaning a filter during operation of a vehicle, comprising an internal combustion engine (10), which during operation sends exhaust to an exhaust system (140) comprising said filter, and a transmission (90) drivable by the engine. The method is characterized by the step of selecting a gear ration in the vehicle transmission so that a first temperature within a first temperature interval is obtained, said first interval being dependent on a degree of plugging of the filter with regard to a first particle type. The method is furthermore characterized by the step of then selecting a gear ration so that a second temperature within a second temperature interval is obtained, said second temperature interval being dependent on another degree of plugging of the filter with regard to a second particle type. The first particle type and the second particle type are different from each other. Said selections achieve regeneration of the filter.
Abstract:
The invention relates to a method and device for controlling an exhaust gas aftertreatment system, in particular, of an internal combustion engine. A state quantity is determined which characterizes the state of the exhaust gas aftertreatment system. The temperature of the exhaust gas aftertreatment system is controlled according to the state of the exhaust gas aftertreatment system and/or of the internal combustion engine.
Abstract:
L'invention porte principalement sur un procédé d'estimation d'un chargement en suies d'un filtre à particules (16) de moteur thermique (10) relié à une ligne d'échappement (12), caractérisé en ce qu'il comporte: une étape de mesure ou d'estimation d'un débit des gaz d'échappement (Deb_ech), et une étape de sélection d'une stratégie d'estimation du chargement en suies du filtre à particules (16) en fonction du débit des gaz d'échappement (Deb_ech) mesuré ou estimé.