Abstract: In addition to the first exhaust emission purification device (12) arranged in an exhaust passage of the engine, having the first continuously regenerating type DPF (12A) and the first SCR catalyst (12B), in the bypass exhaust passage (101) there is provided the second exhaust emission purification device (13) having the second continuously regenerating type DPF (13A) and the second SCR catalyst (13B) to constitute the exhaust emission purification system for the diesel engine. In addition, when the exhaust gas temperature is within the low-temperature region lower than the predetermined temperature region, the exhaust gas temperature is raised, and after the exhaust gas is caused to pass through the second exhaust emission purification device (13), control is made so as to pass through the first exhaust emission purification device (12).

Abstract: A method of controlling an exhaust gas aftertreatment system in a compression ignition engine having a power-assisted turbocharger coupled to a power source. The turbocharger includes a compressor in communication with an intake manifold and a turbine in communication with an exhaust manifold. The method comprises the steps of determining an operating mode of the exhaust gas aftertreatment system selected from the group consisting of a light off mode, regeneration mode, and storage mode. The method then determines a charge value associated with the power source, and engages the power source to the power-assisted turbocharger as a function of the charge value and the operating mode of the exhaust gas aftertreatment system. In one aspect of the invention, negative power is applied to the power-assisted turbocharger to increase the exhaust gas temperature to achieve particulate filter light-off.

Abstract: A low NOx combustion mode is executed in which the fuel injected timing IT is greatly advanced to 36° BTDC as compared with a normal value of roughly 10° BTDC. At this fuel injection timing IT, the smoke emission amount is suppressed below an extremely low value, even if the EGR ratio Regr is increased to about 56%, and the NOx emission amount is suppressed owing to a large amount of EGR, so that the smoke and NOx can be reduced at the same time.

Abstract: An engine comprising a particulate filter which is arranged in the exhaust passage and has a function of absorbing NOx, where the amount of discharged particulate discharged from the combustion chamber per unit time is made smaller than the amount of particulate removable by oxidation per unit time without emitting a luminous flame on the particulate filter and where the temperature of the particulate filter is maintained in a temperature range where the NOx absorption rate becomes more than a certain value.

Abstract: A device for stabilizing the flow in the exhaust pipe of an internal combustion engine, in particular, at the outlet on the exhaust side of an exhaust turbocharger fitted downstream of an internal combustion engine, comprises a guide baffle (3, 8), which, in turn, comprises a plurality of web plates (6) extending in the direction of the flow transversely to the exhaust pipe (1).

Abstract: The invention relates to a method for regenerating a particulate filter in the exhaust system of a diesel engine, an increase in the temperature of the exhaust gases being brought about by post-injection of fuel. The intake pressure (MAP) and/or the air mass flow rate (MAF) are reduced as a function of the ambient temperature of the engine and preferably also when the engine load is low by throttling the engine. In this way, the proportions of burned or unburned post-injected fuel can be stabilized.

Abstract: A method and an arrangement serve to operate an internal combustion engine equipped with an exhaust-gas turbocharger. An after-injection takes place with the overlapment of the opening angle of the inlet and outlet valves of a cylinder. The after-injection leads to an air/fuel mixture in the exhaust-gas system which is combustible. This mixture is combusted by driving an additional ignition device in the exhaust-gas system.

Abstract: In a direct gasoline injection type spark igniting internal combustion engine provided with a turbocharger and a catalyst, in order to optimize an exhaust gas control, the structure is made such that an optimum exhaust gas control can be obtained only by one control valve by designing an arrangement of a pre catalyst, the turbocharger and a bypass exhaust gas passage and placing a control valve. Further, a stratified operation area is expanded by reducing a capacity of the turbocharger, shifting an actuation area to a low capacity side and corresponding to an area of a stratified combustion so as to increase an air amount in the stratified area. Accordingly, since it is possible to early warm up a main catalyst at a time of starting the engine, whereby the exhaust gas is purified, and the air amount in the stratified area is increased, the stratified area expands to a high output side and a fuel consumption is improved.

Abstract: There is provided a compression ignition type engine comprising an exhaust gas purification catalyst, and an electric motor for generating an output separated from the engine output. The engine may selectively perform a first control to make the engine output an output larger than that determined on the basis of the engine operation state, and a second control to operate the engine under the first combustion mode in which the inert gas amount in the chamber is larger than that in which the soot generation amount is peak.

Abstract: A method and apparatus for the thermal aging of catalytic converters uses a gas dynamic exhaust gas generator for generating heated exhaust gas for the thermal aging process. The gas generator includes a gas dynamic air compressor, an exhaust gas turbine driving the compressor and a combustor or burner receiving compressed air from the compressor, for burning fuel to form heated combustion products, delivered as heated compressed exhaust gas to the turbine for driving the compressor. In a preferred embodiment, the cost of the converter aging apparatus is reduced by using a commercially available engine exhaust turbocharger to provide the compressor and turbine. A combustor is connected between the compressor and turbine and the desired fuel and air connections, controls and an exhaust conduit are provided to complete the apparatus. The turbocharger may be sized for aging one or a plurality of catalytic converters at the same time.

Abstract: This system is characterized in that the engine is linked to various members and to means for checking the operation of these various members in order to control the operation of the engine, these means also being designed to trigger a regeneration phase of the particle filter by combustion of the particles trapped in the latter, at the same time initiating a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase, and in that the checking means comprise means for determining the particle load of the filter, which are connected a differential-pressure sensor arranged at the terminals of the filter and designed to deliver information representing the overall load of the filter, means for estimating the load of the filter in terms of residues other than the particles, and means for calculating the load of the particle filter from the overall load and from the load of other residues of the filter.

Abstract: A filtration system adapted to prevent diesel soot carried with recirculated exhaust gas from being recirculated through internal combustion engine. The filtration system provides continuous elimination of soot, thus reducing its negative impact on engine life, lubrication oil quality, and on components in the exhaust gas recirculation system. The filtration system comprises a non-thermal plasma generator that periodically, or continuously, oxidizes carbon deposited, or trapped, within a carbon filter disposed downstream of the non-thermal plasma generator.

Abstract: A method and arrangement for control of a combustion engine (11) having control elements (4, 5, 17) for generation of an air/fuel mixture to each cylinder (3) of the engine (1), an exhaust system (7, 8) which is connected to the engine (1), an exhaust catalyst (10) and a NOx absorbent (11) which are provided in the exhaust system (7, 8), which method comprises: control of the control elements (4, 5, 17) in a first operating condition for generation of a comparatively lean exhaust gas mixture to the NOx adsorbent (11) for adsorption of NOx compounds in the exhaust gas mixture, and control of the control elements (4, 5, 17) in a second operating condition for generation of a comparatively rich exhaust gas mixture to the NOx absorbent (11) for desorption of NOx compounds in the exhaust gas mixture.

Abstract: In a direction-injection engine incorporating a turbocharger, fuel combustion is improved to enhance fuel economy within the high-load range of engine torque, and furthermore to control occurrence of smoke in the range of great load within the lean-burn range.

Abstract: In a direct gasoline injection type spark igniting internal combustion engine provided with a turbocharger and a catalyst, in order to optimize an exhaust gas control, the structure is made such that an optimum exhaust gas control can be obtained only by one control valve by designing an arrangement of a pre catalyst, the turbocharger and a bypass exhaust gas passage and placing a control valve. Further, a stratified operation area is expanded by reducing a capacity of the turbocharger, shifting an actuation area to a low capacity side and corresponding to an area of a stratified combustion so as to increase an air amount in the stratified area. Accordingly, since it is possible to early warm up a main catalyst at a time of starting the engine, whereby the exhaust gas is purified, and the air amount in the stratified area is increased, the stratified area expands to a high output side and a fuel consumption is improved.

Abstract: In an internal-combustion engine (1) of the Otto type, in which exhaust gases are used in order to drive a turbocompressor (14, 15) for supercharging the engine, the engine is designed in such a manner that it can, at high load, be run with a lean mixture during supercharging, the air/fuel ratio being at least 19:1. The lean mixture is brought about by virtue of the fact that the charging pressure increases while the fuel quantity is maintained. The engine is advantageously provided with a divided exhaust-gas discharge in order to improve the operating characteristics.

Abstract: A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device comprises a particulate trap disposed in the engine exhaust system, an exhaust gas recirculation passage communicating the upstream of the particulate trap in the engine exhaust system with the engine intake system, a control valve for controlling the amount of exhaust gas recirculated through the exhaust gas recirculation passage to be an optimum amount in accordance with an engine operating condition. In the device, an amount of the fresh air introduced into the engine intake system during a fuel-cut is detected, and an amount of particulate trapped by the particulate trap is estimated on the basis of the amount of fresh air detected after the control valve is opened to a predetermined opening degree.

Abstract: A method and apparatus for the thermal aging of catalytic converters uses a gas dynamic exhaust gas generator for generating heated exhaust gas for the thermal aging process. The gas generator includes a gas dynamic air compressor, an exhaust gas turbine driving the compressor and a combustor or burner receiving compressed air from the compressor, for burning fuel to form heated combustion products, delivered as heated compressed exhaust gas to the turbine for driving the compressor. In a preferred embodiment, the cost of the converter aging apparatus is reduced by using a commercially available engine exhaust turbocharger to provide the compressor and turbine. A combustor is connected between the compressor and turbine and the desired fuel and air connections, controls and an exhaust conduit are provided to complete the apparatus. The turbocharger may be sized for aging one or a plurality of catalytic converters at the same time.

Abstract: Exhaust gas purification method and system of an internal combustion engine. The internal combustion engine comprises a generator driven by said internal combustion engine, a battery charged with an electricity generation output from the generator, and a NOx adsorption catalyst placed in an exhaust gas passage. The catalyst chemisorbs NOx in a state where the amount of an oxidizer is larger than that of a reducer in the stoichiometry relation of oxidoreduction between components contained in exhaust gas exhausted from said internal combustion engine and catalytically reduces the adsorbed or absorbed NOx in a state where the amount of the reducer is at least equivalent to that of the oxidizer.

Abstract: An exhaust gas purification system 1 is provided with a first air fuel ratio controlling means which, when the amount of NOx deposited on an NOx adsorber catalyst 10 reaches a predetermined level, alters an air fuel ratio of exhaust gas from a diesel engine 2 to come into contact with the NOx adsorber catalyst 10, so as to cause the NOx adsorber catalyst to release NOx deposited thereupon; and with a reference NOx level setting means for setting a reference NOx level in accordance with a load of the diesel engine 2. Even when the engine runs in a high load range, it is possible to reduce the frequent recourse to the run at about stoichiometric air fuel ratio, by setting a reference level to a considerably high level, and to thereby restrict deterioration of the durability and rate of fuel consumption of diesel engine 2 to a least possible limit.

Abstract: A heavy duty diesel engine having an exhaust system incorporating a catalyst to convert NO to NO2 and a particulate trap on which soot particles are continuously oxidized, and a portion of the exhaust gases are recirculated through a cooler and exhaust gas flow valve before being mixed with air and fed to the engine cylinders. The system also incorporates a sensor to detect the amount of NOx in the exhaust to adjust the gas flow valve, thereby adjusting the portion of recirculated exhaust gas fed to the engine cylinders.

Abstract: The present invention relates to an engine diagnostic system for detecting malfunctions in an engine system having a variable geometry turbine exhaust system. The engine diagnosis system includes a variable geometry turbine adapted to receive exhaust gasses exiting an engine, a variable geometry turbine position sensor operationally connected to the variable geometry turbine, a compressed air reserve, a pressure capsule pneumatically connected between the compressed air reserve and the variable geometry turbine, a pressure regulator pneumatically connected between the compressed air reserve and the capsule, a pressure sensor pneumatically connected between the pressure regulator and the capsule, and an electronic control module electrically connected to the variable geometry turbine position sensor, to the pressure regulator, and to the pressure sensor. The sensors may be integrally connected to the engine exhaust system, or may be part of a diagnostic station.

Abstract: An exhaust system for a multi-cylinder internal combustion engine has at least two exhaust valves per cylinder. A first exhaust valve in each cylinder is connected to a first catalyst, and a second exhaust valve in each cylinder is connected to a second catalyst which opens out upstream of the first catalyst. The first exhaust valves or their outlets are kept closed during a starting phase of the engine, so that, during the starting phase, all the exhaust gases first pass through the second catalyst which is smaller than the first catalyst and is positioned closer than the latter to the engine.

Abstract: In a two-stage concept for supercharging of internal combustion engines, in which the first stage is performed by an exhaust-gas turbocharger and the second stage by an electrically driven compressor, the compressor is also used to provide the secondary air used for the heating of a catalytic converter. In this manner, the catalytic converter quickly reaches an efficient operating temperature.

Abstract: A regeneration aid system (4) for a particulate filter integrated into the exhaust line (2) of a diesel engine of a motor vehicle, comprising means (5) for injecting fuel into at least some of the cylinders of the engine (1) during the expansion stage thereof in order to cause an increase, without any modification of engine torque as requested by the user, in the temperature of the exhaust gas therein, so that regeneration aid can be provided with respect to the filter, characterized in that the means of injection (5) are adapted in order to result in several fuel injections in calibrated amounts spread out in time during the expansion stage.

Abstract: A diesel engine equipped with an exhaust gas particulate filter includes a control system that reduces exhaust gas smoke emissions normally resulting from an extended period of engine idling. The control method periodically raises the exhaust gas temperature in order to purge the particulate filter of water and hydrocarbons that build up during extended engine idling and cause exhaust smoke. A timer records the elapsed period during which the engine remains at idle and the exhaust temperature is below a threshold level. When the recorded time period exceeds a preselected value, the filter is purged by elevating the exhaust gas temperature to a level sufficient to oxidize the gaseous hydrocarbons and evaporate any water that may have accumulated in the filter.

Abstract: There is provided a control device for controlling an engine operation such that the engine is operated at a predetermined fuel consumption in accordance with a requested output. The engine comprises an electric motor and an exhaust gas purification catalyst. When an air fuel ratio of an exhaust gas should be made rich to restore an ability of purification of the catalyst, the device controls the motor operation such that the air fuel ratio of the exhaust gas is made rich while the engine output is caused to be decreased and the shortage of the engine output relative to the requested output is supplemented by the motor output to totally output the requested output.

Abstract: A system for estimating turbocharger compressor outlet temperature includes an engine controller responsive to any two of corrected turbocharger speed, corrected fresh mass air flow and turbocharger compressor pressure ratio (compressor outlet pressure/compressor inlet pressure) to compute compressor outlet temperature based on a corresponding compressor outlet temperature model.

Abstract: A system 10 is provided for monitoring the loading of a diesel particulate filter 12. System 10 is adapted for use in combination with a vehicle including an internal combustion diesel engine 14 of the type having several substantially identical cylinders 16 which drivably rotate a crankshaft 17. Engine 14 includes an intake manifold 18 which selectively delivers air to cylinders 16, and an exhaust manifold 20 which selectively discharges exhaust gasses from cylinders 16. System 10 includes an engine control unit or controller 40 which is communicatively connected to a pressure sensor 42 that is operatively disposed in the intake manifold 18, and other vehicle operating conditions sensors 44. Controller 40 monitors the signals received from sensors 42 and 44, and based upon the received signals, estimates the loading of the DPF 12 and determines when the DPF 12 should be regenerated.

Abstract: A catalytic converter for cleaning the exhaust gas of an internal combustion engine with a supercharger. The catalytic converter has a catalyst carrier body and is adapted to being fitted into a connecting joint in an exhaust pipe upstream of supercharger in a direction of exhaust gas flow. A retaining element fastens the catalyst carrier body in the connecting joint.

Abstract: A system for assisting the regeneration of a particle filter integrated into an exhaust line of an engine that admits air into the engine and includes a valved return that selectively closes a path that recycles exhaust gas from the engine to the engine inlet. An additive is added to fuel, the additive deposited onto the particle filter to lower the combustion temperature of the particles trapped in the filter. A control system monitors the regeneration system and triggers a regeneration phase of the particle filter by combustion of the particles trapped in the engine, at the same time initiating a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase. The control system further closes the recycling path during a regeneration phase of the particle filter to enable the monitoring of the composition of the gases at the inlet of the particle filter.

Abstract: An internal combustion engine having a lean NOx catalyst is capable of relieving a load upon an engine fuel injection device by eliminating the use of sub-injection, and of well purifying an exhaust gas and recovering from S-poisoning even by eliminating the use of the sub-injection. The internal combustion engine has a combustion heater for allowing a flow of combustion gas through an engine intake passageway to raise temperatures of engine related elements, a lean NOx catalyst, provided in an engine exhaust passageway, for purifying an engine exhaust gas, and a combustion gas introducing passageway for introducing at least some proportion of a combustion gas emitted by the combustion heater, toward upstream of the lean NOx catalyst in the engine exhaust passageway from the engine intake passageway when making a request for a reproducing process of the lean NOx catalyst.

Abstract: A nitrogen oxide absorbing material (38) which absorbs nitrogen oxide when the reduction component concentration of exhaust gas in the exhaust passage (31) of an engine (1) is lower than a predetermined concentration, and discharges nitrogen oxide when the reduction component concentration of exhaust gas in the exhaust passage (31) of the engine (1) is higher than the predetermined concentration, and a catalyst (38) which promotes reduction of the discharged nitrogen oxides by a reduction component are provided. A controller (40) first reduces the reduction component concentration of the exhaust gas over a first predetermined time period by, for example, advancing the fuel injection timing. The controller (40) then increases the reduction component concentration of the exhaust gas over a second predetermined time period by, for example, retarding the fuel injection timing.

Abstract: An exhaust gas heat exchange system for an internal combustion engine (10) includes an intake manifold (12) including an inlet (16) for recirculating exhaust gases and an exhaust manifold (28) having at least one inlet (30) for receiving exhaust gas from the engine (10) and an outlet (36), (60), for discharging exhaust gas and spaced from the inlets (30). An exhaust gas heat exchanger (32) includes a first flow path having an inlet (50) connected to the exhaust manifold (32) to receive exhaust gas therefrom, an outlet (52) for discharging cooled exhaust therefrom and a second flow path in heat exchange relation with the first flow path for receipt of a coolant whereby exhaust gas flowing in the first flow path may be cooled.

Abstract: The invention relates to a device and a method for reducing emissions in catalytic converter exhaust systems for a vehicle provided with a combustion engine. The invention comprises a control unit adapted to control the air-fuel being fed to the engine so that a high concentration of hydrogen is generated in the exhaust gas during start-up of the engine. Furthermore, secondary air is supplied downstream of the engine during cold starting thereof for foaming a gas mixture with the exhaust gas. This gas mixture is oxidized, so that heat energy generated by means of this oxidation is supplied to the catalyst, thereby providing a reduction of the light-off time of the catalyst.

Abstract: A diesel engine includes a turbocharger, an intercooler, a particulate filtering unit, and an EGR cooler. EGR ratio of intake air, injection timing of an injection nozzle, and excess air ratio to fuel are controlled depending upon engine-operating load. Lean premixed compression ignition is performed at low engine load; low temperature combustion at low excess air ratio with high EGR ratio is performed at medium engine load; and normal EGR combustion is performed at high engine load.

Abstract: An engine comprising a silencer in the exhaust passage thereof, wherein an exhaust gas flow passage pipe is arranged in the silencer body and a particulate filter is arranged inside the exhaust gas flow passage pipe. A first exhaust gas inflow-outflow opening and a second exhaust gas inflow-outflow opening of the exhaust gas passage pipe and an exhaust gas inflow opening to the silencer body are arranged at one end of the silencer body. The exhaust gas is selectively supplied to the first exhaust gas inflow-outflow opening, second exhaust gas inflow-outflow opening, and exhaust gas inflowing opening.

Abstract: In a method for operating a combustion engine having an exhaust-gas turbocharger, it is possible to switch over between a normal operation and a special operation. In the special operation, at least one main fuel injection and at least one secondary fuel injection are provided. In response to a positive load jump, a switch-over between the normal operation and the special operation provided for increasing the exhaust gas enthalpy is performed, the secondary fuel injection in the special operation being adjusted so that it substantially burns in the combustion chamber and causes an increase in the exhaust gas enthalpy as well as an adjustment of a rich or a lean exhaust gas composition. The method according to the present invention may be used, for example, in a motor vehicle having a diesel engine.

Abstract: A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device comprises a particulate filter, arranged in the exhaust system, on which the trapped particulates are oxidized. The engine can be operated in a first operating mode in which it is given priority to improve the fuel consumption rate thereof and a second operating mode in which it is given priority to regenerate the particulate filter to oxidize the trapped particulates. One of the first operating mode and the second operating mode is selected to operate the engine at need.

Abstract: A secondary air system 10 is proposed for an internal combustion engine, which has a turbine 11 driven by a pressure gradient in the intake air and a compressor 14 driven by the turbine 11. The turbine is connected by a turbine inlet line 12 and a turbine outlet line 13 to an air intake duct 20. The compressor 14 has a compressor inlet line 15 and a compressor outlet line 16. The cold produced by the turbine 11 is used by a turbine heat exchanger 17 and transport lines 27 for the cooling of, e.g., oil. The heat produced by the compressor 14 is used by a compressor heat exchanger 18 and the transport lines 27 connected thereto, e.g., for heating air.

Abstract: A non-engine based exhaust component rapid aging system comprises a combustor in fluid communication with an air and a fuel supply; and a first emission analyzer in fluid communication with said combustor, wherein said first emission analyzer and said combustor are further capable of being disposed in fluid communication with an exhaust component; and wherein said non-engine based exhaust component rapid aging system is capable of operation at an air to fuel ratio of about 7 to about 16.

Abstract: The spark ignition engine is provided with a pressure wave machine and comprises a three-way catalyst. In order to improve the cold start properties both of the catalyst and of the pressure wave machine, a heating device is disposed between the catalyst and the pressure wave machine. For a better elimination of the pollutant constituents HC, CO, and NOx, the three-way catalyst is followed by an oxidation catalyst, the oxidation catalyst being disposed between the outlet of the pressure wave machine and the exhaust. In this manner, the oxidation catalyst can operate with excess air which comes from the pressure wave machine. Such a combination yields a high specific power and at the same time an essential reduction of the pollutants while allowing very good cold start properties of the entire combination.

Abstract: A diesel-cycle engine with a unique exhaust gas recirculation system includes a plurality of cylinders with fuel feed for each of the cylinders and an intake manifold for distributing intake air to each of the cylinders for combustion of the fuel charges therein with generation of exhaust gas. The exhaust gas is discharged to ambient atmosphere through an exhaust line with a gas turbine therein. The gas turbine drives an intake compressor which serves to compress the intake air. An engine controller controls a valve regulating the amount of exhaust gas recirculation responsive to sensed concentration of an exhaust gas component. In another embodiment, an engine controller controls a valve regulating the amount of exhaust gas recirculation, responsive to sensed demand for torque and control of fuel injection quantity is responsive to sensed concentration of an exhaust gas component.

Abstract: An engine comprising a particulate filter which is arranged in the exhaust passage and has a function of absorbing NOx, where the amount of discharged particulate discharged from the combustion chamber per unit time is made smaller than the amount of particulate removable by oxidation per unit time without emitting a luminous flame on the particulate filter and where the temperature of the particulate filter is maintained in a temperature range where the NOx absorption rate becomes more than a certain value.

Abstract: A drive assembly for a vehicle with an internal-combustion engine for supplying driving energy, has an exhaust gas turbocharger which has a turbine and a compressor. The turbine is driven by exhaust gases of the internal-combustion engine, and the compressor is driven by the turbine. An air guiding system supplies fresh air to the compressor, in which the fresh air is compressed to form charge air. The air guiding system guides the charge air from the compressor to the internal-combustion engine, and the power of the internal-combustion engine is to be increased at low rotational speeds by an additional compressor which generates compressed fresh air which, as a function of the requirements, can be supplied to the air guiding system upstream of the internal-combustion engine. As the additional compressor, a compressor is used which is already present in the vehicle for other purposes.

Abstract: An engine where first combustion where the amount of the EGR gas in the combustion chamber is larger than the amount of EGR where the amount of production of soot peaks and a second combustion where the amount of EGR gas in the combustion chamber is smaller than the amount of EGR gas where the amount of production of soot peaks are selectively switched between and where an NOx absorbent is placed in the exhaust passage of the engine. When SOx should be released from the NOx absorbent, the first combustion is performed under a rich air-fuel ratio, while when the second combustion is performed, auxiliary fuel is injected during the first part of the suction stroke or the expansion stroke and the injection timing of the main fuel is delayed by a large extent.

Abstract: This system is characterized in that the engine (1) is linked to various members and to means (17) for checking the operation of these various members in order to control the operation of the engine, these means also being designed to trigger a regeneration phase of the particle filter by combustion of the particles trapped in the latter, at the same time initiating a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase, and in that the checking means (17) are designed to control closing of the means (4) for recycling the exhaust gases at the inlet of the engine during a regeneration phase of the particle filter, so as to make it possible to check the composition of the gases at the inlet of the particle filter (7) and isotorque operation of the engine.

Abstract: An engine having in an exhaust system a lean NOx catalyst for purifying nitrogen oxide in an oxygen excessive exhaust gas by using a reducing agent, includes an intake air quantity decreasing device for decreasing a quantity of intake air flowing through an intake system when the nitrogen oxide needs to be purified by the lean NOx catalyst, and a combustion heater provided separately from the internal combustion engine also serves as a CO2 adding device for adding carbon dioxide to the intake air when a flowing quantity in the intake system decreases by operating the intake air quantity decreasing device. With this arrangement the reducing agent such as hydro carbon and the like can be supplied even when eliminating an auxiliary injection hitherto needed in the internal combustion engine having the lean NOx catalyst.

Abstract: In an arrangement and method for controlling a supercharged internal combustion engine having a charger arranged in the air intake duct and a catalytic converter arranged in the exhaust duct, with a secondary air duct including a control valve extending from a point of the intake duct downstream of the charger and upstream of a first throttle member to a point of the exhaust duct upstream of the catalytic converter, a second throttle member is arranged in the intake duct upstream of the charger and the throttle members and control valve are controlled by a control unit in such a way that sufficient air is supplied to the exhaust duct upstream of the catalytic converter such that, during engine warm-up, combustion takes place in the catalytic converter causing rapid heat-up of the catalytic converter.

Abstract: A fuel system for a gas engines has exhaust gas monitors for signals (p, T, V) related to exhaust gas mass flow with an air to fuel controller that acts to adjust the intake of a gaseous fuel, which can vary widely in composition, to maintain a desired level of exhaust gas mass flow.