Abstract:
System in which the depollution apparatus is associated with an oxidation catalyst-forming device, and the engine is associated with a common rail for feeding it with fuel and adapted to implement the strategy of regeneration using at least one postinjection of fuel into the cylinders. In the system, a regeneration request can be detected, a state in which the vehicle accelerator pedal is being raised can be detected, the temperature downstream from the catalyst-forming means can be acquired, and it can be determined, on the basis of this temperature, the maximum duration for applying postinjections during a stage in which the engine is returning to idling as a result of the accelerator pedal being raised, for immediately cutting off postinjection as soon as the duration of postinjection use has reached the maximum duration.
Abstract:
The invention concerns a system for evaluation regeneration of pollution management means (1) integrated in an exhaust line (2) of a motor vehicle engine, characterized in that it comprises means (4) for determining the thermal power input by the exhaust gas upstream of the pollution management means during the regeneration phase thereof and means (4) for comparing said power to threshold values (Sb, Sh) to determine a partial or total failure of regenerating said means.
Abstract:
The invention concerns a system for assisting regeneration of pollution management means (1) integrated in an exhaust line (3) of a diesel engine (4), wherein the engine (4) is associated with common ramp means (7) injecting fuel into the cylinders thereof, based on at least one post-injection and adapted to implement, in isocouple, through modification of the engine operation control parameters, at least two strategies called level 1 and level 2 and a second regeneration strategy including level 1 strategies and a sequence alternating level 2 and over-calibrated level 2 strategies, enabling different thermal levels to be achieved in the exhaust line. The invention is characterized in that it comprises means (8) for analyzing the vehicle running conditions and means (8) for comparing same to threshold values, to implement the first regeneration strategy for running conditions higher than the threshold values or the second regeneration strategy for running conditions lower than the threshold values.
Abstract:
The system for assisting the regeneration of depollution means (4) associated with oxidation catalyst-forming means (3) integrated in an exhaust line (2) of a motor vehicle diesel engine (1) in which the engine (1) is associated with common manifold means (5) for feeding fuel to its cylinders, the system being adapted implement, at constant torque, a strategy of regeneration by injecting fuel into the cylinders of the engine in at least one post-injection, is characterized in that it includes means (7, 8, 9) for detecting a stage in which the vehicle engine is idling or in which the accelerator pedal is being raised, and means (6) for analyzing the activity state of the catalyst-forming means (3) in order to control the common fuel-feed manifold means (5) in order to regulate the quantity of fuel injected during the or each post-injection as a function of the activity state of the catalyst-forming means (3).
Abstract:
This system for assisting the regeneration of depollution means associated with oxidation catalyst-forming means implementing an OSC function, constituting a supply of oxygen and integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with common rail means for feeding its cylinders with fuel, comprises means for analyzing the running conditions of the vehicle and for comparing them with predetermined threshold values, to control the engine in a first regeneration mode of operation with a lean mixture when running conditions are above the threshold values, or in a second regeneration operating mode implementing sequences in which engine operation alternates between stages of rich mixture operation and of lean mixture operation when conditions are below the threshold values.
Abstract:
This system in which the NOx trap (1) is associated with catalyst-forming means (2) integrated in an exhaust line (3) of a vehicle engine (4), and in which the engine is associated with common manifold or “rail” fuel feeder means (7, 8) for feeding it with fuel and adapted, by modifying control parameters for the operation of the engine, to cause the engine to switch between lean mixture operation (9)and rich mixture (10), is characterized in that the fuel feeder means (7, 8) are adapted to define three strategies (11, 12, 13) for controlling lean mixture operation of the engine (9), and in that the fuel feeder means (7, 8) are adapted to cause the engine to switch between its various strategies in order to keep the trap (1) in a temperature window of maximum effectiveness.
Abstract:
This system in which the NOx trap (1) is associated with catalyst-forming means (2) integrated in an exhaust line (3) of a vehicle engine (4), and in which the engine is associated with common manifold or “rail” fuel feeder means (7, 8) for feeding it with fuel and adapted, by modifying control parameters for the operation of the engine, to cause the engine to switch between lean mixture operation (9) and rich mixture (10), is characterized in that the fuel feeder means (7, 8) are adapted to define four strategies (11, 12, 13, 14) for controlling lean mixture operation of the engine (9), and in that the fuel feeder means (7, 8) are adapted to cause the engine to switch between its various strategies in order to keep the trap (1) in a temperature window of maximum effectiveness.
Abstract:
This system in which the depollution means (1) are associated with oxidation catalyst-forming means (2), and the engine (4) is associated with common manifold means (7) for feeding fuel and adapted to implement a regeneration strategy using at least one post-injection of fuel into the cylinders, is characterized in that it includes means (8) for detecting a regeneration request (req.RG)), means (9) for detecting when the engine is idling, means (11) for acquiring the temperature downstream from the catalyst-forming means, means (8) for determining, on the basis of said temperature, a maximum quantity of fuel to be injected when post-injections take place while the engine is idling on the basis of said temperature, and means (7, 8) for progressively reducing post-injection as soon as the quantity of fuel injected has reached the maximum quantity.
Abstract:
This system for aiding the regeneration of pollution-control means (1) that are integrated in an exhaust line (2) of an engine (3) of a motor vehicle, in which the engine is associated with means (6) for the common supply of the cylinders thereof, which means are in a form suitable for injecting fuel, during regeneration, into each cylinder in the form of at least one principal injection and at least one post-injection during the expansion phase of the cylinder, is characterized in that the supply means (6) are in a form suitable for cutting at least the principal injection of at least one of the cylinders in order to increase the oxygen content of the exhaust gases and to optimise the regeneration of the pollution-control means.