Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a device for measuring a quantity of a reducing agent, preferably NH3, contained in a vessel (10; 110; 210) containing a storage material (11; 111; 211) in which the reducing agent is stored, the volume of the storage material (11; 111; 211) varying depending on the quantity of reducing agent which it contains. The measuring device comprises means (13, 14, 14?; 113, 114; 213, 214) associated with the vessel (10; 110; 210), said means being suitable for measuring the quantity of reducing agent stored in the storage material (11; 111; 211) depending on the volume of the latter.

Abstract: 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 (8) which contains a pollutant-removing agent and which is arranged such that the temperature thereof is controlled by a heating device (9). The system further comprises a supply module (6) arranged so as to inject the pollutant-removing agent into the exhaust gases, the supply module (6) comprising a device for measuring the pressure (6a) or the temperature inside the storage chamber (8), as well as a device (6b) for proportioning the pollutant-removing agent.

Abstract: The invention relates to a device for measuring a quantity of a reducing agent, preferably NH3, contained in a vessel (10; 110; 210) containing a storage material (11; 111; 211) in which the reducing agent is stored, the volume of the storage material (11; 111; 211) varying depending on the quantity of reducing agent which it contains. The measuring device comprises means (13, 14, 14?; 113, 114; 213, 214) associated with the vessel (10; 110; 210), said means being suitable for measuring the quantity of reducing agent stored in the storage material (11; 111; 211) depending on the volume of the latter.

Abstract: System to reduce the amount of NOx in exhaust gases of a vehicle. The system includes a storage space 1 containing an agent, a SCR catalytic converter 5, an injection module 6c to inject the agent upstream of the converter, a heat exchanger 2 containing a porous matrix, a shutter or injector 11 to control the flow rate of the agent to the exchanger, a valve 12 between 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.

Abstract: The present invention relates to a method for determining the quantity of reducing agent in a tank (10) of a system intended to reduce the amount of NOx in the exhaust gases of a motor vehicle. The system comprises: a storage material (11) arranged in the tank (10) and capable of storing and of releasing the reducing agent reversibly according to the demand for reducing agent which may vary over the course of time; a heating device (12) designed to supply heat in order to release the reducing agent from the storage material (11), and a control device (13) for driving the heating device (12) in order to release the reducing agent.

Abstract: The invention relates to a system intended to reduce the amount of NOx in the exhaust gases of a motor vehicle. The system comprises a storage space (1) containing a reducing agent; an SCR (selective catalytic reduction) catalytic converter (5) for treating the exhaust gases laden with reducing agent, and an injection module (6c) designed to inject the reducing agent from the storage space (1) into the exhaust gases of the motor vehicle upstream of the SCR catalytic converter (5). The system further comprises: at least one heat exchanger (2) connected to the storage space (1) and containing a porous matrix intended to absorb the reducing agent originating from the storage space (1); a valve or an injector (11) downstream of the storage space (1) and upstream of the exchanger (2) and designed to control the addition of reducing agent to the exchanger (2), and a valve (12) positioned between the storage space (1) and the exchanger (2).

Abstract: 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 (8) which contains a pollutant-removing agent and which is arranged that the temperature thereof is controlled by a heating device (9). The system further comprises a supply module (6) arranged so as to inject the pollutant-removing agent into the exhaust gases, the supply module (6) comprising a device for measuring the pressure (6a) or the temperature inside the storage chamber (8), as well as a device (6b) for proportioning the pollutant-removing agent.

Abstract: The invention relates to a method for monitoring the pollutant emissions of a combustion engine comprising at least one piston, the translatable movement of which defines a combustion chamber, said engine being combined with an exhaust line that, in the direction of exhaust gas flow, comprises an oxidation catalyst, an NOx reduction catalyst, and a particle filter, the method being characterized by the use of a fuel comprising an additive assisting in soot combustion when re-refined by the particle filter, and according to at least one operating mode of the engine, the fuel is injected in accordance with a calibration minimizing carbon dioxide discharges by the engine.

Abstract: The invention relates to a method for monitoring the pollutant emissions of a combustion engine comprising at least one piston (1), the translatable movement of which defines a combustion chamber, said engine being combined with an exhaust line (9) that comprises, in the direction of the exhaust gas flow, an oxidation catalyst (14), an NOx reduction catalyst (15), and a particle filter (18), the method being characterized by the use of a fuel comprising an additive assisting in soot combustion when re-refined by the particle filter (18) and, according to at least one operating mode of the engine, the fuel is injected in accordance with a calibration minimizing carbon dioxide discharges by the engine.

Abstract: 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.

Abstract: The invention relates to a system for the removal of SOx (sulphur oxide) stored in a nitrogen oxide (NOx) trap associated with an oxidation catalyst and disposed in an exhaust line of an engine, said system including a stop module (54) capable of controlling the stopping a NOx trap purge task as a function of the SOx removal speed estimated by an estimator (60).

Abstract: The invention relates to a system for determining the level of sulphur poisoning of depollution means integrated into the exhaust line of a motor vehicle engine, said system being associated with means for controlling the operation thereof, for switching the system between a lean storage mode and a rich storage mode. The inventive system is characterised in that it comprises means (19) for calculating the sulphur storage speed in the lean mode, means (20) for calculating the sulphur elimination speed in the rich mode, means (21, 22) for calculating the quantity of sulphur stored in the depollution means during the operation of the engine and means for comparing (23) the quantity of sulphur with threshold values for determining a poisoning level of the depollution means.

Abstract: This system for the elimination of SOx (Sulphur Oxide) stored in a NOx (24) (Nitrogen Oxide) trap associated with an oxidation catalyst and placed upstream of a particle filter (26) in an exhaust line of a motor vehicle engine comprises a feed supervisor (32) able only to trigger the execution of an operation to flush out the NOx trap and cancel the execution of an operation to regenerate the particle filter, when the flushing out operation is to be performed immediately before or after the regeneration operation.

Abstract: 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.

Abstract: 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.

Abstract: A system for triggering purging of depollution means including a NOx trap and integrated in a vehicle diesel exhaust line comprises respective means 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 means for combining these various coefficients in order to obtain a fifth and final coefficient, and comparator means 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.

Abstract: A NOx trap is associated with oxidation catalyst-forming means 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 from 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.