Renault S.a.s.

Renalt S.a.s.

Pascal Barrillon

Fabrice Gauvin

Emmanuel Poilane

Olivier Meurisse

Stephane Cochet

Pierre-Yves Le-Morvan

A method for controlling temperature of a gas post-treatment system in an exhaust circuit of a thermal engine having a more or less rich combustion mode, in which at least a post-treatment member is periodically submitted to regeneration phase at a set-point temperature. The duration of each regeneration phase is divided into a series of fractioned periods for tuning the engine alternatively according to two combustion modes each having a different richness, respectively a mode hotter than necessary for reaching the set-point temperature and a mode that is not so hot, the duration of each period being controlled so that excess energy introduced during a hotter mode period is compensated by the lack of energy in the following period with the less hot mode, and conversely, to maintain at the output of the post-treatment member a mean temperature corresponding to the set-point temperature.

Method for controlling the temperature of the exhaust gases of a thermal engine

A method and device for estimating temperature of gases arising from internal combustion of an engine at the entrance to a system for post-treatment of the gases. The post-treatment system is downstream from a system for treatment of the gases, which may include a nitrogen oxide NOtrap, an oxidation catalyst, or a 4-way catalyst. The systems connect to each other by a line, wherein the treatment system is considered as the whole of a whole finite number n of fictive elementary reactors Rthat are perfectly agitated and serially connected, wherein the total number n of fictive elementary reactors Ris determined, in particular as a function of volume of the treatment system, and the fictive elementary reactors Rare numbered from 1 to n in the gas flow direction along the treatment system. Fictive elementary reactor Ris the last to be cross-flown by the gases before leaving the treatment system, and the temperature at the post-treatment system entrance downstream from the system for the treatment of the gases is calculated from the temperature inside the last fictive elementary reactor R.

Method and device for estimating the temperature of exhaust gases entering into a post-treatment system arranged downstream from a system for the treatment of said gases

The invention relates to a method of estimating a nitrogen oxide mass stored in a catalytic nitrogen oxide trapping device () which comprises a catalytic phase and which is traversed by the exhaust gases () from the internal combustion engine () of a motor vehicle () comprising an electronic control unit (). The inventive method consists in: discretising the geometry of the catalytic trapping device () into several (n) perfectly-stirred, successive individual reactors (); and combining a thermal model, which can be used to calculate the temperature variation of the catalytic phase of the catalytic trapping device () during the traversing movement of the exhaust gases, and an absorption model, which can be used at any moment to calculate the nitrogen oxide mass stored in the catalytic trapping device () on the basis of the characteristics of said device (), the temperatures from the thermal model for each individual reactor and the exhaust gas mass flow from the engine ().

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Issy les Moulineaux, France

Pascal Barrillon