Aaqius & Aaqius Sa

Peugeot Citroen Automobiles Sa

Psa Automobiles Sa

Peugeot Citroen Automobiles Societe Anonyme

Arnaud Audouin

Jean-Baptiste Dementhon

Christophe Charial

Benoit Frouvelle

Pierre-Henri Maesse

Benoît Frouvelle

Jean Nicolas Lesueur

A method for determining the quantity of reducing agent in a tank vehicle, including: a storage material in the tank for storing and releasing the reducing agent according to demand; a heating device to supply heat to release the reducing agent, and a control device for driving the heating device. After the motor vehicle is started, driving the heating device so that it delivers constant power during an initial phase over which the pressure inside the tank increases until it reaches a predetermined value. The heating device then regulating the pressure around a datum value; then measuring the time of the initial phase or the derivative of pressure with respect to time during this initial phase; and comparing the measured time against various calibrated values of the initial phase in order to determine the quantity of reducing agent in the tank.

Method for determining the quantity of reducing agent in a tank

A method for determining the quantity of reducing agent in a tank of a motor vehicle, including: a storage material in the tank for storing and releasing the reducing agent according to demand; a heating device to supply heat to release the reducing agent, and a control device for driving the heating device. After the motor vehicle is started, driving the heating device so that it delivers constant power during an initial phase over which the pressure inside the tank increases until it reaches a predetermined value. The heating device then regulating the pressure around a datum value; then measuring the time of the initial phase or the derivative of pressure with respect to time during this initial phase; and comparing the measured time against various calibrated values of the initial phase in order to determine the quantity of reducing agent in the tank.

The invention relates to a device for measuring a quantity of a reducing agent, preferably NH, contained in a vessel () containing a storage material () in which the reducing agent is stored, the volume of the storage material () varying depending on the quantity of reducing agent which it contains. The measuring device comprises means () associated with the vessel (), said means being suitable for measuring the quantity of reducing agent stored in the storage material () depending on the volume of the latter.

Device for measuring a quantity of a reducing agent, preferably NH3, contained in a vessel

The invention relates to a method for controlling a system for reducing the amount of NOx in the exhaust gases of a motor vehicle. The system comprises a storage chamber () which contains a pollutant-removing agent and which is arranged such that the temperature thereof is controlled by a heating device (). The system further comprises a supply module () arranged so as to inject the pollutant-removing agent into the exhaust gases, the supply module () comprising a device for measuring the pressure () or the temperature inside the storage chamber (), as well as a device () for proportioning the pollutant-removing agent. The control method involves, for example: defining a predetermined moving criterion, in particular on the basis of the engine torque during a first period; filtering the moving criterion with a filtering period (T) corresponding to the first period; comparing the filtered moving criterion with various thresholds in order to determine a type of moving; determining the elapsed time for each type of moving during a second period (T) in order to associate a trend representing moving conditions throughout said second period; calculating a set pressure or set temperature according to the type and the trend representing past moving conditions; comparing the set pressure or set temperature with the pressure or temperature measured by the pressure- or temperature-measuring device (); and heating the storage chamber () if the pressure or temperature inside the latter is lower than the set pressure or set temperature.

Method for reducing the amount of NOx in the exhaust gases of a motor vehicle

System to reduce the amount of NOx in exhaust gases of a vehicle. The system includes a storage spacecontaining an agent, a SCR catalytic converter, an injection moduleto inject the agent upstream of the converter, a heat exchangercontaining a porous matrix, a shutter or injectorto control the flow rate of the agent to the exchanger, a valvebetween the storage space and exchanger, to transfer thermal energy to gases during the starting period. The shutter or injector controls the flow of agent into the exchanger during the starting period to raise its temperature, and is closed when gases have reached a certain temperature. The valve regulates exchanger pressure during a period at operating temperature and conveys the agent to storage space when the exchanger pressure is higher than storage space pressure.

System intended to reduce the amount of NOx in the exhaust gases of a motor vehicle

A system for determining the level of sulphur poisoning of a depollution device integrated into the exhaust line of a motor vehicle engine involves controlling the operation thereof, switching the system between a lean storage mode and a rich storage mode, calculating the sulphur storage speed in the lean mode, calculating the sulphur elimination speed in the rich mode, calculating the quantity of sulphur stored in the depollution device during the operation of the engine and comparing the quantity of sulphur with threshold values for determining a poisoning level of the depollution device.

System for determining the level of sulphur poisoning of depollution means integrated into the exhaust line of a motor vehicle engine

A system for triggering purging of depollution means including a NOx trap and integrated in a vehicle diesel exhaust line comprises respective elements for establishing: a first coefficient representing the extent to which the trap is full of NOx; a second coefficient representative of the capacity of the trap to reduce the NOx as a function of its temperature; a third coefficient representative of the capacity of the engine to purge the trap as a function of the engine operating point; and a fourth coefficient representative of the capacity of the engine to purge the trap as a function of the corresponding excess fuel consumption; together with a device for combining these various coefficients in order to obtain a fifth and final coefficient, and a comparator for comparing the fifth coefficient with a threshold so that in the event of the threshold being exceeded, a request is issued to trigger purging of the trap.

System for triggering the purging of NOx trap depollution means

A NOx trap is associated with oxidation catalyst-forming structure integrated in a common medium, and is located in an exhaust line of a motor vehicle diesel engine. The engine can be controlled at least with a rich mixture control strategy and with lean mixture control strategies of level 1 and level 2. The system acquires the temperatures upstream and downstream torn the trap, and on detecting a request to purge sulfate, it compares the temperatures with first and second curves for controlling operation of the engine with a rich mixture if the temperatures lie between said curve, and otherwise with a lean mixture. The system also compares the temperatures with third and fourth curves for controlling operation of the engine to apply the level 2 strategy if the temperatures lie between said curves, Or otherwise to apply the level 1 strategy.

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Paris, France

Arnaud Audouin