Abstract: The present invention describes an exhaust-gas purification system for an internal combustion engine made of an oxidation catalyst arranged close to the engine, a subsequent hydrocarbon adsorber and a particulate filter arranged downstream thereof and provided with another oxidation catalyst. The oxidation catalyst ensures that emission limits with respect to carbon monoxide and hydrocarbons are satisfied in normal driving mode. During operating states with exhaust-gas temperatures below about 200° C., the oxidation catalyst can no longer oxidize carbon monoxide and hydrocarbons. Instead, the hydrocarbons are adsorbed by the hydrocarbon adsorber during these operating phases. In order to initiate the periodical regeneration of the particulate filter, the exhaustgas temperature of the internal combustion engine is raised by engine modifications.

Abstract: An emissions control system for a vehicle configured to travel on a road is provided. In one example, a forced modulation of a UEGO is provided when output of a HEGO sensor is unavailable.

Abstract: Systems, methods, and computer readable storage media are described in which exhaust gas is routed to a hydrocarbon retaining device during starting, and purged to the engine intake manifold. Various alternative approaches are described for controlling operation and diagnosing degradation. Further, various interrelated configurations are described.

Abstract: The invention concerns a system for assisting regeneration of a particulate filter (6) arranged in an exhaust line (3) of a diesel engine (1) associated with a oxidizing catalyst (7), the engine (1) being equipped with feeding means (8) for injecting into the cylinders thereof at least one post-injection. Said system comprises means (17) for controlling the feeding means (8) in accordance with a strategy for regenerating the filter (6) wherein the feeding means (8) are switched between a first operating mode with post-injection for priming the catalyst (7) and a second operating mode with post-injection for producing an exothermic reaction by the primed catalyst (7). Said system comprises a temperature sensor (18) arranged in the exhaust line (3) upstream of the catalyst (7), and the control means (8) are capable of switching the feeding means (8) between the first and second operating modes based on said sensed temperature.

Abstract: The exhaust purification system for an internal combustion engine according to the present invention includes fuel supply means for supplying fuel to the NOx storage-reduction catalyst from the upstream side thereof, and SOx poisoning recovery control executing means that uses the fuel supply means to supply fuel to the NOx storage-reduction catalyst thereby executing the SOx poisoning recovery control at a predetermined interval during operation of the internal combustion engine. In addition, according to the present invention, the execution of the SOx poisoning recovery control by the SOx poisoning recovery control executing means is prohibited during a predetermined period DELTA Qfen2 starting from a point in time that the operation of the internal combustion engine is initially started. The predetermined period DELTA Qfen2 is longer than a predetermined interval DELTA Qfen1.

Abstract: An exhaust after-treatment system having a main tank configured to retain and supply a reductant is disclosed. The exhaust after-treatment system includes a main heat source disposed in the main tank and configured to thaw the reductant. The exhaust after-treatment system also includes a secondary tank configured to retain a supply of reductant and a pump configured to pass reductant from the secondary tank to the main tank. The exhaust after-treatment system further includes a secondary heat source configured to thaw the reductant within the secondary tank.

Abstract: The present invention relates to a method of controlling the intake of an internal-combustion engine comprising at least two groups (12, 14) of at least one cylinder (C1-C4) wherein a feed is admitted for operation of said engine, and an exhaust line (40, 94, 100) comprising at least one exhaust gas depollution means (42, 96, 102). According to the invention, the method consists, while the engine runs at low speeds and/or at low torques, in evaluating the total feed to be admitted into the cylinders to operate the engine, in admitting a greater proportion of the total feed into one (12) of the groups of cylinders (C1, C4) than in the other (14) group of cylinders (C2, C3) so as to achieve an exhaust gas temperature increase allowing to speed up the rise in temperature of depollution means (42, 96, 102).

Abstract: In a method for operating an air-compressing fuel-injection internal combustion engine having an exhaust gas post-treatment system with a particle filter and a nitrogen oxide reduction catalytic converter, a plurality of internal combustion engine operating settings are provided, each having respective predefined values for predefined internal combustion engine operating parameters. A heating operating setting is set when the internal combustion engine is warming up, while a basic operating setting is set in the warmed-up state. When the temperature in the exhaust gas system exceeds a predefinable first value, the heating operating setting is changed over to the basic operating setting. In the warmed-up state, at least one further, (third) operating setting, with an exhaust gas recirculation rate that is reduced compared to the basic operating setting, is provided in addition to the basic operating setting.

Abstract: An apparatus, system, and method are disclosed for efficiently increasing exhaust flow temperature for an internal combustion engine. The method includes excepting a user input to disable an exhaust valve opening mechanism. The method further includes monitoring exhaust gas mass flows and temperatures, interpreting required exhaust temperatures for aftertreatment devices, and surveying a plurality of operating conditions for a combustion engine. The method includes determining a crankshaft angle for dynamically engaging an exhaust valve open mode based on the exhaust temperature, the required exhaust temperature, and the engine operating conditions. Dynamically engaging the exhaust valve open mode includes selecting a specific crankshaft angle for each combustion cycle of the engine.

Abstract: An object of the invention is to realize a method of determining an abnormality in a particulate filter (5) capable of trapping and oxidizing particulate matter contained in exhaust gas in which even a minor abnormality in which small quantity of particulate matter can pass through the particulate filter (5) can be determined with a high degree of accuracy. To achieve this object, the abnormality determination method according to the invention, the transition of the inflowing exhaust gas temperature in and the outflowing exhaust gas temperature out of the particulate filter (5) during deceleration operating, and the degree of decrease in the outflowing exhaust gas temperature relative to the inflowing exhaust gas temperature is computed based on the transition. If the degree of decrease exceeds a threshold value, it is determined that the particulate filter (5) is abnormal.

Abstract: A cold-start control system includes an air pump control module that controls an air pump and an engine starting module that starts an engine. The air pump control module activates the air pump to supply oxygen to a catalytic converter based on a temperature of the catalytic converter. The engine starting module starts the engine based on the temperature of the catalytic converter.

Abstract: An emissions control system includes a temperature determination module and an emissions control module. The temperature determination module determines a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system and determines a second temperature of a catalyst of the DPF assembly. The emissions control module selectively activates the heater element, selectively initiates a predefined combustion process in an engine based upon the first temperature, and selectively starts a reductant injection process based upon the second temperature.

Abstract: A throttle operation is performed after an internal combustion engine is started. Then, temperature of a catalyst is obtained based on a signal output from a temperature sensor fitted to the catalyst. It is then determined whether the temperature obtained is equal to or higher than the activation temperature. If it is determined that the temperature of the catalyst has not reached the activation temperature, the throttle operation continues. On the other hand, if it is determined that the temperature of the catalyst is equal to or higher than the activation temperature, the non-throttle operation is performed instead of the throttle operation.

Abstract: According to the invention, an exhaust gas purification device for an engine is provided. The device comprises: a plurality of cylinders, the cylinders being divided into at least two cylinder groups; exhaust branch pipes connected to the cylinder groups at their upstream ends, respectively; a common exhaust pipe connected to the downstream ends of the exhaust branch pipes; and a NOx catalyst positioned in the common exhaust pipe.

Abstract: An operating method for a system including a reformer which in reformate mode can convert hydrocarbon-containing fuel to a hydrogen-rich reformate gas, and a catalytic exhaust gas aftertreatment device which is acted upon by reformer gas to reach the catalytic converter light-off temperature more rapidly. During cold starts, the reformer, after its own starting phase, is initially operated in a so-called lean-burn mode, and the reformer is switched from lean-burn mode to reformate mode as soon as combustible constituents in the catalytic aftertreatment device can be independently oxidized. During the reformer lean-burn mode, the combustible constituents of the engine's exhaust gas react with the hot reformer gas, such that the cumulative exhaust gas flow has the composition of exhaust gas generated by stoichiometric combustion.

Abstract: The invention relates to an apparatus for producing hot gas with a first combustion chamber (2) to burn fuel (17). The first combustion chamber features an open (5) and a closed end (36), and the first combustion chamber has a fuel inlet (13) arranged at its closed end. A second combustion chamber (35) encloses the first combustion chamber, with the second combustion chamber featuring a discharge outlet (37) for the hot gas, and the second combustion chamber featuring a closed end at which an inlet for combustion air (39) is arranged.

Abstract: An emissions control system is disclosed. The emissions control system may have a power source that creates a flow of exhaust and a filtering device that receives the flow of exhaust. A first sensor may be located at or upstream of the filtering device, the first sensor being configured to measure a first temperature, and an SCR catalyst may be located downstream of the filtering device. The emissions control system may also have an injector configured to inject a reduction agent into the flow of exhaust in the presence of the SCR catalyst. The emissions control system may further have a controller in communication with the first sensor. The controller may be configured to predict a change in an ability of the SCR catalyst to store reduction agent using a measured change in the first temperature and adjust the injector according to the predicted change in the storage ability of the SCR catalyst.

Abstract: The present invention relates to new crystalline, essentially all silicon oxide molecular sieve SSZ-73 prepared using a 3-ethyl-1,3,8,8-tetramethyl-3-azoniabicyclo[3.2.1]octane cation as a structure-directing agent, and its use in treating engine exhaust.

Abstract: An exhaust gas post treatment system for nitrogen oxide and particle reduction of internal combustion engines operated with excess air. An oxidation catalytic converter is disposed in the exhaust gas stream of the engine for converting at least a portion of the nitric oxide in the exhaust gas into nitrogen dioxide. The first particle separator or filter is disposed in the exhaust gas stream downstream of the oxidation catalytic converter for converting carbon particles accumulated in the separator or filter into carbon monoxide, carbon dioxide, nitrogen and nitric oxide with the aid of nitrogen dioxide contained in the exhaust gas. A partial exhaust gas stream is branched off from the exhaust gas stream upstream of the first separator or filter. A metering device adds reduction agent to the partial exhaust gas stream in the form of ammonia or a material that releases ammonia downstream of the supply location due to hot exhaust gas.

Abstract: A method for cold start white smoke protection of a hydrocarbon after treatment device, and method of engine operation to effect the same. The method comprises a) determining the temperature of the hydrocarbon after-treatment device during cold start conditions; b) determining hydrocarbon emissions in the hydrocarbon after-treatment device; and c) modifying engine operating conditions to raise the hydrocarbon after-treatment temperature at a pre-determined rate to a temperature sufficient to permit controlled oxidation of the hydrocarbons in the hydrocarbon after treatment device.

Abstract: A NOx trap comprises components comprising at least one platinum group metal, at least one NOx storage material and bulk ceria or a bulk cerium-containing mixed oxide deposited uniformly in a first layer on a honeycombed substrate monolith, the components in the first layer having a first, upstream, zone having increased activity relative to a second, downstream zone for oxidising hydrocarbons and carbon monoxide, and a second, downstream, zone having increased activity to generate heat during a desulphation event, relative to the first zone, wherein the second zone comprises a dispersion of rare earth oxide, wherein the rare earth oxide loading in the second zone is greater than the loading in the first zone. An exhaust system for a lean burn internal combustion engine, a vehicle comprising a lean burn internal combustion engine and the exhaust system and methods of making the NOx trap are also disclosed.

Abstract: A combustion control apparatus is configured for a direct-injection spark-ignition internal combustion engine. The combustion control apparatus selects an extremely retarded combustion mode while the internal combustion engine is in a predetermined operating state. In the extremely retarded combustion mode, the combustion control apparatus sets ignition timing to be after compression top dead center, and sets fuel injection timing to be before the ignition timing and after compression top dead center. The combustion control apparatus inhibits the extremely retarded combustion mode while an exhaust purifier of the internal combustion engine is in a predetermined cold state.

Abstract: Systems and methods for reducing NOx emissions using a branched exhaust system with a first and second turbine including an emission-control device containing a zeolite, are described. In one example approach, a method comprises: during a first duration when exhaust temperature is below a first temperature threshold, directing exhaust gas through the second turbine and the emission-control device, and adjusting the second turbine to control intake boost; and during a second duration following the first, directing exhaust gas through the first turbine, and adjusting the first turbine to control intake boost. The emission-control device may be purged when exhaust temperature is above a second temperature threshold higher than the first temperature threshold, where during the second duration exhaust gas does not flow through the emission-control device.

Abstract: In a vehicle having mounted therein an engine including an injector that directly injects fuel into a cylinder, in the case in which a warm-up control required condition is established, catalyst warm-up control is executed if an amount of fuel diluted in oil is low, or even if the amount of fuel diluted in oil is high, when the temperature of the engine oil is less than the fuel volatilization temperature. In contrast, even in the case in which the warm-up control required condition is established, if the amount of fuel diluted in oil is greater than or equal to a determination value, and furthermore the temperature of the engine oil is greater than or equal to the fuel volatilization temperature, there is the possibility of negative influence on exhaust emissions, and therefore the catalyst warm-up control is prohibited.

Abstract: Disclosed herein is a method and apparatus for reducing exhaust gases in an initial cold start period, in which a main catalyst unit is connected to an engine through an exhaust pipe, including the steps of receiving signals for stopping engine operation from an engine, and removing engine exhaust gases remaining in an exhaust pipe located at an inlet of a main catalyst unit.

Abstract: A method for improving engine control during a regeneration of an exhaust gas after treatment device is described. According to one aspect of the description, engine air amount and engine fuel amount may be adjusted based on data from a previously executed regeneration of an exhaust gas after treatment device.

Abstract: A method for controlling temperature of a catalyst. The method includes monitoring temperature of the catalyst and determining that the catalyst is outside of a catalyst operating temperature window. If the catalyst temperature is high enough for exothermic reaction to occur, reformate is injected into the catalyst. If the catalyst not high enough for exothermic reaction to occur, reformate is injected upstream of the catalyst and ignited.

Abstract: One embodiment of the present invention includes an internal combustion engine system designed to increase exhaust temperature when operating with a low mechanical load—such as idle operation. This increased exhaust temperature is provided to operate aftertreatment equipment. Exhaust temperature is raised by operating a portion of the engine pistons in a brake mode to increase loading on a remainder of the pistons operating in a combustion mode to drive the engine. Fuel provided to pistons operating in the combustion mode is regulated to maintain speed of the engine within a desired idle speed range.

Abstract: The invention relates to a procedure to heat up or keep warm an exhaust gas emission control assembly of a vehicle with a drive train containing one transmission. The drive train is powered by an internal combustion engine and at least one second drive unit. It is proposed that also in an operating state, which lies outside of the idle speed, a rotational speed or a torque of the internal combustion engine deviating from values for the engine rotational speed and the torque is set, which would exist during an identical driving condition without the heating-up or keeping warm of the exhaust gas emission control assembly.

Abstract: An apparatus, system, and method are disclosed for utilizing engine-generated heat in a NOx-adsorber system. The apparatus may comprise a combustion device generating a heated exhaust stream. The apparatus may include a catalytic component that initiates at least one exhaust conditioning reaction within the heated exhaust stream. The catalytic component is fluidly coupled to the engine with a downpipe segment configured to preserve a minimum temperature at the catalytic component inlet based on specified operating conditions for the combustion device. The apparatus may also include a NOx-adsorber fluidly coupled to the catalytic component with a second downpipe segment.

Abstract: An engine system for a vehicle includes a first heat pipe in contact with the exhaust and a first fluid of the engine system; a second heat pipe in contact with the exhaust and a second fluid of the engine system. In one example, the first heat pipe provides increased heat transfer during a first temperature condition and the second heat pipe provides increased heat transfer during a second temperature condition different than the first temperature condition.

Abstract: Super retard combustion is performed in which an ignition timing is set to be after a compression top dead center and fuel is injected before the ignition timing and after the compression top dead center, at cold start or the like which requires early warming-up of a catalyst. During an idle operation without the super retard combustion, a first ISC control is executed in which a feedback control is provided for the degree of opening of a throttle and the ignition timing so that an engine speed corresponds to a target idle speed (S14). On the other hand, during the super retard combustion, a second ISC control is executed in which the control of the degree of opening of the throttle is inhibited, but the ignition timing is advanced because a catalyst may be thermally damaged when the amount of intake air is increased in accordance with an increase in load of an auxiliary device and the like (S15).

Abstract: An exhaust system includes a heating element that is disposed downstream from an engine and that introduces thermal energy into an exhaust of the engine. A selective catalyst reduction (SCR) unit is disposed downstream from the heating element and filters nitrogen oxides (NOx) within the exhaust. A control module is in communication with and energizes the heating element based on temperature of the SCR unit.

Abstract: A diesel exhaust aftertreatment system and method are provided. The system includes a lean NOx trap for reducing NOx and a transition metal-exchanged zeolite booster catalyst positioned downstream from the lean NOx trap for further reducing NOx. The lean NOx trap includes a NOx adsorbent material and one or more platinum group metals, and has a platinum group metal loading of less than about 90 g/ft3. The aftertreatment system provides high NOx conversion over a broad temperature range without the use of ammonia as a major reductant.

Abstract: In an engine 5 including an in-cylinder injector, the valve timing of an intake valve is retarded by VVT (Variable Valve Timing) controlled by an engine ECU to decompress in a combustion chamber at engine startup. In accordance with a configuration in which the valve timing of intake valve is advanced in a stepped manner from an initial set value, fuel injection from in-cylinder injector is inhibited during the time when the advance is equal to or below a predetermined standard value, and fuel injection from in-cylinder injector is allowed when exceeding the predetermined standard value, whereby degradation in the exhaust emission level in accordance with start time decompression control can be suppressed.

Abstract: A control system for controlling regeneration of a particulate filter for a hybrid vehicle is provided. The system generally includes a regeneration module that controls current to the particulate filter to initiate regeneration. An engine control module controls operation of an engine of the hybrid vehicle based on the control of the current to the particulate filter.

Abstract: An exhaust gas sensor for detecting oxygen concentration in exhaust gas is disposed in an exhaust pipe of an internal combustion engine. The sensor including a heater is controlled by a system that includes an electronic control unit. Water vapor contained in the exhaust gas is condensed on the sensor when the exhaust gas temperature is low. If the water condensation occurs while the sensor is heated by the heater, a sensor element may be cracked due to local cooling by the condensed water. To avoid the water condensation, the exhaust gas temperature is raised by retarding ignition timing of the engine for a certain period after the engine is started. After the exhaust gas is heated to a certain level, the sensor is heated. Alternatively, heating of the sensor is prohibited until the exhaust gas temperature becomes to a level at which no water condensation occurs. Thus, the cracking of the sensor element is avoided while making a delay of sensor activation minimal.

Abstract: An ECU performs exhaust temperature control based on output values of multiple exhaust temperature sensors provided upstream and downstream of a particulate filter provided in an exhaust passage of an engine. The ECU calculates a change speed deviation value by subtracting change speed of outlet side exhaust temperature, which is sensed by one of the exhaust temperature sensors, from change speed of inlet side exhaust temperature, which is sensed by the other one of the exhaust temperature sensors, in an operation state in which temperature of exhaust gas flowing through the particulate filter changes rapidly. The ECU determines that the exhaust temperature sensors are mounted erroneously if the change speed deviation value deviates from a predetermined normal range.

Abstract: An abnormality diagnosis apparatus is used for a secondary air supply system for an internal combustion engine. The system includes an air pump for supplying secondary air into an upstream of a catalyst in an exhaust gas passage of the internal combustion engine. A secondary air detecting means detects secondary air information. An abnormality diagnosis means performs an abnormality diagnosis of the secondary air supply system in accordance with the secondary air information detected using the secondary air detecting means. A temperature information determining means performs at least one of detection and estimation of air pump temperature information. A condition setting means performs at least one of setting and compensating a condition for evaluating normality and abnormality of the secondary air supply system in accordance with the air pump temperature information.

Abstract: In a method for purifying exhaust gases in particular from lean-burn internal combustion engines having an exhaust-gas converter with a heat exchanger and catalysts arranged in inflow and/or outflow passages, the heat exchanger exhaust gas which flows in is heated by heat exchange with exhaust gas which flows. The incoming exhaust gas enters the inflow passages without encountering any obstacle susceptible to blockages, and flows through the inflow passages to a diversion region. Heat is fed to the exhaust gas by means of a burner. The burner is operated with fuel, air and engine exhaust gas in such a way that it supplies either an oxidizing or a reducing exhaust gas. Burner exhaust gas is admixed to the gas which emerges from the inflow passages and, together with this gas, enters the outflow passages, where nitrogen oxides are removed from it by a deNOxing catalyst present in the outflow passages.

Abstract: The degree of a deterioration in catalyst is determined when the following requirements are satisfied: the operating state of an internal combustion engine (E) is in a predetermined operating state; and the temperature (T1m) of an exhaust gas, which flows into a catalyst (12), is in a second temperature range (?T80) in which the upper limit of the second temperature range (?T80) is 10% below the upper limit of a first temperature range (?T100) between the activation start temperature (Ta) and the activation end temperature (Tb) of the catalyst (12) before a deterioration and the lower limit of the second temperature range (?T80) is 10% above the lower limit of the first temperature range (?T100).

Abstract: A system and method may be provided for operating a system having an engine with an emission control system, the emission control system including a lean NOx trap and a particulate filter, where after lean exhaust gas air-fuel ratio regeneration of the particulate filter at an elevated regeneration temperature, a rich or intermittently rich exhaust air-fuel ratio is provided for a duration lasting until LNT temperature falls to a minimum threshold, where said rich or intermittently rich operation reactivates catalysts in the LNT and reverses deactivation caused by the elevated temperature lean operation associated with previous particulate filter regeneration.

Abstract: An air-fuel ratio control apparatus of an internal combustion engine includes first and second catalysts 10 and 12, first air-fuel ratio acquiring means 8 provided up-stream of the first catalyst, for acquiring an air-fuel ratio of exhaust gas; second air-fuel ratio acquiring means 11 for acquiring an air-fuel ratio of the exhaust gas flowing into the second catalyst, and air-fuel ratio controlling means 13 for controlling an air-fuel ratio according to the air-fuel ratios acquired by the first and second air-fuel ratio acquiring means, and the air-fuel ratio controlling means is provided with lean control means 13 for controlling an air-fuel ratio until the second catalyst becomes lean after completion of a fuel quantity increasing operation of the engine, and intermediate lean control means 13 for performing control to change the air-fuel ratio to a lean air-fuel ratio within the range enough to make the first catalyst lean and not enough to make the second catalyst lean, between the fuel quantity increasin

Abstract: Described here are systems and methods for controlling IC engines. In one aspect, a method for controlling a fuel processor is provided, the method including i) determining a temperature of an exhaust flow to the fuel processor, the fuel processor including a fuel processor catalyst; ii) determining a concentration of O2 in the exhaust flow upstream of the fuel processor catalyst; iii) determining a rate of the exhaust flow; and iv) adjusting a fuel flow rate to the fuel processor based on i), ii), iii) and a heat capacity value associated with the fuel processor. In other aspects, a system comprising logic operable to control a fuel processor is provided.

Abstract: The inventive system for assisting in the regeneration of depollution means (1) which is integrated in the exhaust means (3) of a diesel engine (4), wherein the engine (4) is associated with a common rail supplying means (7, 8) for injecting fuel into cylinders thereof using at least one post-injection and for carrying out at least two regeneration strategies by isotorque modifying the parameters of the engine operation control, wherein the first regeneration strategy comprises a first level strategy and a second level strategy and the second regeneration strategy comprising the first level strategies and a sequence alternating the second and second over-calibrated level strategies, thereby making it possible to obtain different thermal levels in the line.

Abstract: The present invention relates to new crystalline molecular sieve SSZ-74 prepared using a hexamethylene-1,6-bis-(N-methyl-N-pyrrolidinium) dication as a structure-directing agent, and its use in treating engine exhaust.

Abstract: An exhaust gas purification system for a hybrid vehicle is disclosed. An internal combustion engine and an electric motor are each arranged for providing power output for the vehicle. An exhaust gas purification device is provided in an exhaust gas passage of the engine to treat exhaust gas components contained in the exhaust gas from the engine. A controller is arranged and configured to selectively perform a regeneration operation of the exhaust gas purification device to burn and remove deposits accumulated in the exhaust gas purification device. The controller is further arranged and configured to control the internal combustion engine and the electric motor such that the exhaust gas purification device is restrained from reaching an excessive temperature during the regeneration operation of the exhaust gas purification device.

Abstract: An exhaust emission purifying apparatus for an engine in which it is determined that a reducing agent supply system is clogged, which is arranged on the downstream of a pump carrying out suction and pumping of a liquid reducing agent out of a reducing agent tank, when a reduction in a pressure of the liquid reducing agent remaining in the downstream of the pump and also in the upstream of a flow control valve by an amount equal to or more than a first predetermined pressure does not occur until a cumulative injection amount obtained by sequentially integrating an injection amount of the liquid reducing agent computed in real time based on engine operating conditions reaches a predetermined amount after the pump has been temporarily stopped.

Abstract: The invention concerns a system for assisting regeneration of pollution management means (1) associated with oxidation catalyst forming means (2) implementing an oxygen storage capacity (OSC) function, and integrated in an exhaust line of a motor vehicle diesel engine (4), wherein the engine is associated with common ramp means (7) supplying fuel to the cylinders thereof. The invention is characterized in that it comprises means (8) for determining the frequency of the pollution management means regeneration and for comparing same to predetermined threshold values (10), to control the engine (4) in a first lean mixture regeneration operating mode (11) for frequencies less than the threshold values or in a second regeneration operating mode implementing engine operating sequences alternating rich mixture and lean mixture operating phases (12) for frequencies more than the threshold values.

Abstract: A system for purifying exhaust gas generated by an internal combustion engine including a bypass branching out from the exhaust pipe downstream of a catalyst and merging to the exhaust pipe, an adsorber installed in the bypass, a bypass valve member which closes the bypass, and an EGR conduit connected to the bypass at one end and connected to the air intake system for recirculating the exhaust gas to the air intake system. The bypass valve member is opened for a period after engine startup to introduce the exhaust gas such that the adsorber installed in the bypass adsorbs the unburnt HC component in the exhaust gas. The adsorber adsorbs the HC component when the exhaust temperature rises and the adsorbed component is recirculated to the air intake system through the EGR conduit. In the system, the bypass valve is provided at or close to the branching point in the exhaust pipe and a chamber is provided close to the branching point such that the conduit is connected to the bypass at the one end in the chamber.