Abstract: An exhaust system for a marine engine provides individual exhaust gas conduits that are maintained separately from water conduits until the individual exhaust gas conduits can be combined within a common exhaust gas conduit. This combination of exhaust gas streams allows the amplitude of negative pressure pulses to be damped, by combination with each other, prior to the mixing of cooling water with the exhaust gas streams. Later, the combined exhaust gas stream can be mixed with a combined water stream.

Abstract: An internal combustion engine emission control apparatus includes split passages that divide exhaust gas discharged from an internal combustion engine into a plurality of streams. Emission control catalysts are provided that individually divide the exhaust gas in the split passages, and remove a component present in the exhaust gas at a high removal rate if a temperature of exhaust gas that inflows via the split passages satisfies a predetermined temperature condition. A controller changes proportions of the amounts of flow of the exhaust gas into the split passages so that the predetermined temperature condition is satisfied in at least one split passage of the split passages. Therefore, the emission control can be performed in a broad range of changing temperatures of the exhaust gas.

Abstract: An exhaust treatment device is provided for an internal combustion engine of a marine propulsion system. An outer chamber contains a first inner chamber within it and slidably supports the inner chamber. An exhaust inlet conduit directs a stream of exhaust gases from a cylinder of the internal combustion engine directly into the inner chamber. The inner and outer chambers are supported relative to each other to allow relative movement of these two components in response to changes in the differential temperature between the two components. A rail system slidably supports the inner chamber relative to the outer chamber. The exhaust treatment device comprises a liquid cooled housing surrounding the inner and outer chambers. Exhaust gas is directed through the inner chamber and then into the outer chamber at a closed end of the exhaust treatment device. Exhaust gases then flow through the outer chamber to an exhaust conduit of the marine propulsion system.

Abstract: A system for reducing pollutants in internal combustion engine emissions, particularly marine electric generator engines, includes a treatment chamber having an intake opening for receiving gaseous emissions from the engine, and an exhaust opening for exiting emissions. A perforated metal tube is disposed within the treatment chamber, and an electrode is disposed within the metal tube in spaced apart relation to the metal tube. The electrode is encircled by the metal tube so that, upon applying a voltage at a predetermined frequency to the electrode, an arc is generated across the space between the electrode and the metal tube to promote a chemical reaction reducing the concentration of pollutants. The treatment chamber is contained within a manifold, and cooled by a flow of water. A supplemental air source is connected to the treatment chamber, and a chemical substrate is disposed within the treatment chamber for promoting the chemical reaction.

Abstract: A small capacity pre-catalytic system (34) is disposed immediately downstream of an exhaust port (18), and a large capacity main catalytic system (35) is disposed immediately downstream of the pre-catalytic system (34). The pre-catalytic system (34) includes finely divided catalyst supports (48), and a third stage heat exchanger (H3) is disposed between these catalyst supports (48) so that a heat transfer tube (49) is bent in a zigzag manner. Fourth stage and fifth stage heat exchangers (H4, H5) are disposed on the upstream side, in the flow of the exhaust gas, of the pre-catalytic system (34), and first and second stage heat exchangers (H1, H2) are disposed on the downstream side, in the flow of the exhaust gas, of the main catalytic system (35). Water is made to flow through the first stage heat exchanger (H1) to the fifth heat exchanger (H5) in a direction opposite to that in which the exhaust gas flows, thereby exchanging heat with the exhaust gas.

Abstract: An exhaust gas purifying apparatus is provided which includes a three way catalyst provided in an exhaust pipe of an internal combustion engine; and a NOx adsorption/reduction catalyst provided in the exhaust pipe to be located downstream of the three way catalyst. Nickel serving as a catalyst source is loaded on an alumina support layer of the NOx adsorption/reduction catalyst. When the engine operates with a fuel-rich air/fuel mixture at a relatively small air-fuel ratio, a reducing atmosphere is formed around the NOx catalyst, and the reaction to convert NiO into NiS occurs, thereby to consume H2S. As a result, consumption of SO2 proceeds, and the reaction to convert BaSO4 as an oxidized product of sulfur deposited on the NOx catalyst into BaCO3 as an NOx adsorbent is accelerated in an oxidizing atmosphere, thereby resuming the purifying capability of the NOx catalyst.

Abstract: A reducing agent dosing device for delivering a reducing agent into the exhaust gas system 8 of the internal combustion engine 2 of a motor vehicle, comprising a reducing agent tank 3 connected to the exhaust gas system 8 via a supply line 5, 7 with a dosing valve 6 for delivering a specific quantity of reducing agent. The dosing valve 6 is disposed at a distance from the exhaust gas system 8 in the supply line 5, 7 and the output of the dosing valve 6 terminates in a mixing chamber 7. Compressed air, provided by the charge air of a charging group 10 of the internal combustion engine 2, flows though the mixing chamber in the direction toward the exhaust gas system 8 to mix the reducing agent output with an air stream.

Abstract: A device for use with a lean-burning internal combustion engine is disclosed. The device is comprised of a means for generating an air/fuel mixture for the cylinders of the engine in order to provide at least stratified and homogenous operation, an exhaust system connected to the engine, and an NOX-adsorbing catalytic converter arranged in the exhaust system. The device additionally has a heat exchanger that is fitted upstream of the catalytic converter, wherein the heat exchanger is used to adapt the temperature of the exhaust gas from the engine to an operating state of the catalytic converter.

Abstract: A method for improving a purge conversion efficiency of a Lean NOx Trap coupled downstream of a lean-burn internal combustion engine is presented. This method recognizes that during a purge of the LNT, its temperature increases due to the exothermic reactions in the LNT. Once the LNT temperature exceeds a certain threshold, further increases lead to a reduction in the NOx storage capacity, and therefore an increase in NOx emissions during the purge of the LNT. Therefore, it is proposed to cool the LNT temperature once the threshold is exceeded. This method improves emission control and fuel economy during purge.

Abstract: An apparatus and method for vehicle emissions control are disclosed. More particularly, an apparatus and method for insuring that the temperature of a vehicle's exhaust gas stream entering the underfloor catalytic converter during engine operation does not exceed the temperature at which the capability of the multi-functional catalyst in the converter to absorb NOx starts to fall off. A first temperature sensor is provided in the exhaust outlet leading from the exhaust manifold of the engine and a second temperature sensor is provided in the catalytic converter. The catalytic converter contains a multi-functional catalyst such as a three-way conversion catalyst and a NOx trap as well as a NOx sensor at its outlet for sensing when NOx breakthrough is occurring. The sensors transmit their readings to a controller which transmits signal to a proportional valve located in the exhaust outlet downstream of the first temperature sensor.

Abstract: A superintegration of heat exchanger and a typical three way catalyst is disclosed for controlling the temperature of the air entering an internal combustion engine in a homogeneous charge compression ignition engine system. The superintegrated heat exchanger includes a typical catalyst reaction chamber, a coolant pipe coil and a heat exchange unit. A portion of the fresh air induced into air pathway in the superintegrated heat exchanger is preheated by coolant pipe coil and hot surface of the three way catalyst and then is finally heated by exhaust gas through a heat exchanger unit. The heated air is fed back to an intake temperature control valve and is mixed with another portion of fresh air after a Y junction following engine throttle. The intake temperature control valve driven by a step motor can precisely and rapidly control the temperature of fresh and heated air mixture by a locally close-loop controller.

Abstract: The invention relates to a coolant circuit for a motor vehicle having an engine and a radiator. The coolant circuit includes an exhaust gas heat exchanger and enables engine coolant coming from the radiator to be supplied directly to the exhaust gas heat exchanger. In a preferred embodiment, coolant coming from the radiator and/or from the engine can be selectively supplied to the exhaust gas heat exchanger via a changeover device.

Abstract: A system for determining the effectiveness of a catalytic coating on a catalytic converter in a motor vehicle. The system provides a driver or maintenance staff status of the catalytic function provided by the catalytic coating on the catalytic converter which is downstream from a heat exchanger connected to a cooling system in an engine in a motor vehicle. The catalytic converter is arranged to be heated by an air flow passing through the catalytic converter. The catalytic coating on the catalytic converter converts environmentally harmful substances in ambient air into substances which are not harmful to the environment. The motor vehicle also includes a control unit and a sensor. The sensor is connected to the control unit and is able to determine a degree of conversion of one or more environmentally harmful substances by the catalytic coating on the catalytic converter.

Abstract: A waste heat recovering device for an internal combustion engine includes: an internal combustion engine; and an evaporator into which an exhaust gas of the internal combustion engine is introduced as a high temperature fluid. An exhaust gas inlet of the evaporator is placed adjacent to an exhaust valve of the internal combustion engine. Thus, there can be provided a waste heat recovering device having a high waste heat recovery rate.

Abstract: The apparatus (1) for treating exhaust gas from an internal combustion engine includes a storing catalyzer for absorbing NOx during lean operating conditions and a device for burning fuel (3) in an exhaust gas stream (2) to produce a reducing atmosphere in the exhaust gas for storing catalyst regeneration and an aerodynamic control device for controlling the burning of the fuel in the exhaust gas stream, so that combustion is clearly improved when the engine is operated under lean operating conditions and no carbon is formed.

Abstract: An exhaust system used for a motor vehicle and extending between an exhaust-generating internal combustion engine and an exhaust pipe for release of exhaust into the surrounding environment, includes a three-way catalytic converter disposed in proximity of the combustion engine, a NOx-adsorber disposed upstream of the exhaust pipe, and an exhaust line, which extends between the catalytic converter and the NOx-adsorber, for conducting exhaust. The exhaust line includes an inner tube, an outer tube in spaced-apart surrounding relationship to the inner tube to define a space, and a separation tube received in the space, to thereby define between the inner tube and the separation tube an inner annular gap for conducting exhaust, and between the outer tube and the separation tube an outer annular gap for conducting a coolant. A shut-off device is integrated in the inner tube for regulating the flow of exhaust through the inner tube.

Abstract: An uncontrolled heat pipe (20) is used in a valve seat device (19) for transferring the waste heat from the exhaust gas acting on the metering valve (15) to a condensation zone (21) which is situated in an environment which is at a lower temperature, whereby the metering valve is cooled sufficiently to prevent a chemical change of a reducing agent which otherwise can be caused by high temperatures.

Abstract: A catalyst exhaust system includes a catalyst housing having an inlet end, an outlet end, and a passage therethough. The outlet end includes a valve seat, and a water jacket surrounds the catalyst housing. A valve housing is in flow communication with the outlet end and in flow communication with said water jacket to accommodate a valve configured to allow passage of exhaust gases but prevent water from entering the catalyst housing passage and reaching a catalyst therein.

Abstract: The invention relates to an exhaust system for internal combustion engines, especially for use in motor vehicles, comprising an exhaust gas purifying device and a temperature control device disposed in the exhaust path between the internal combustion engine and the exhaust gas purifying device, said temperature control device being provided with a heat exchanger. In order to simplify the construction of such an exhaust system and to achieve a defined cooling capacity, the heat exchanger is configured as a radiation cooler with internal radiation sheets radiating the energy towards the housing.

Abstract: A control system for an engine or exhaust system includes a sensor that detects an exhaust gas temperature and a sensor that detects an exhaust coolant temperature. The sensors communicate with a controller. Based upon the output from the sensors, the controller determines whether each sensor is functioning properly and whether the cooling system is functioning properly. In the event of a malfunction of a sensor or the cooling system, an alarm is issued and the speed or operation of the engine is altered. In addition, if the controller detects a problem with the coolant system based upon coolant temperature or with the coolant temperature sensor, then the controller disables a starter motor such that the engine cannot be restarted without resetting the starter motor. The start motor can be disabled through a relay and the relay can be reset manually or automatically after a preset period of time.

Abstract: An exhaust system or an engine (12) includes a lean NOx catalytic device (18), and a heat exchanger (70) positioned upstream of the catalytic device (18). Control means (44, 46) controls a valve (36) to regulate exhaust gas flow through the heat exchanger (70) or along a bypass path (26). The heat exchanger (70) can cool the exhaust gases to ensure that the maximum operating temperature of the catalytic device (1) is not exceeded. During use, the heat exchanger (70) can be bypassed to allow high temperature purge cycles.

Abstract: A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time constant in turn correlated to the reductant/NOx storage capacity of the reducing catalyst at its current temperature to account for changes in the SCR system attributed to NOx transient emissions. Catalyst temperature is filtered using a variable catalyst time constant corresponding to current space velocity of the exhaust gas to account for changes in the catalyst temperature attributed to NOx transient emissions. The reductant is metered on the basis of the filtered, corrected NOx concentration applied at a NSR ratio based, in turn, on the filtered, corrected reducing catalyst temperature.

Abstract: Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.

Abstract: An apparatus and method of use with internal combustion engines, such as used for land vehicles, for the on-board recovery and purification of water. The source of water is from the vehicle's exhaust, where it is collected by condensation. The water recovery system consists of a device for cooling the exhaust so as to condense out the water, such as a counter-current flow heat exchanger in combination with a chiller (a refrigerant-cooled heat exchanger), which cools the exhaust below its dew point. Exhaust condensate is collected at the outlet of the chiller. These cooling devices may be coupled with the vehicle's air conditioning system. The condensed water then flows through the water purification portion of the present invention.

Abstract: This invention is a two stroke, internal combustion, reciprocating, engine with plunger 14, made up of a number of similar working units. Each working unit is comprised of cylinder 16 that is closed at one end by cylinder head 4, and contains air inlet valve 2, power piston 22 that is connected to power output shaft 26, and plunger 14. Plunger 14 is a movable wall with barrel 10 attached to it. Plunger 14 moves between power piston 22 and cylinder head 4, and the means to accomplish this are: spring 12, the urging of power piston 22 after a collision, and the difference between the internal and external engine pressures. During the compression stroke the pressure inside the engine exceeds the pressure outside of the engine, this pressure difference on the exhaust area forces plunger 14 up against cylinder head 4 and deforms spring 12. During the expansion stroke the pressure difference continues to keep plunger 14 up against cylinder head 4 and spring 12 deformed.

Abstract: An apparatus and method for vehicle emissions control. More particularly, an apparatus and method for insuring that the temperature of a vehicle's exhaust gas stream entering the underfloor catalytic converter during engine operation does not exceed the temperature at which the capability of the multi-functional catalyst in the converter to absorb NOx starts to fall off. A first temperature sensor is provided in the exhaust outlet leading from the exhaust manifold of the engine and a second temperature sensor is provided in the catalytic converter. The catalytic converter contains a multi-functional catalyst such as a three-way conversion catalyst and a NOx trap as well as a NOx sensor at its outlet for sensing when NOx breakthrough is occurring. The sensors transmit their readings to a controller which transmits signals to a proportional valve located in the exhaust outlet downstream of the first temperature sensor.

Abstract: An exhaust system or an engine (12) includes a lean NOx catalytic device (18), and a heat exchanger (70) positioned upstream of the catalytic device (18). Control means (44, 46) controls a valve (36) to regulate exhaust gas flow through the heat exchanger (70) or along a bypass path (26). The heat exchanger (70) can cool the exhaust gases to ensure that the maximum operating temperature of the catalytic device (1) is not exceeded. During use, the heat exchanger (70) can be bypassed to allow high temperature purge cycles.

Abstract: An exhaust purifying apparatus for an internal combustion engine includes a catalyst that purifies exhaust gas from the engine, a first passage that allows exhaust gas to flow from the engine to the catalyst, and a second passage that allows exhaust gas to flow from the engine to the catalyst. The first passage includes an accelerated cooling portion whose cross section is designed so that a relatively large quantity of heat is released from the exhaust gas in the first passage, and the second passage has a cross section designed so that a relatively small quantity of heat is released from the exhaust gas in the second passage.

Abstract: A system for cooling the exhaust of a marine diesel engine, including a water can having a central exhaust flow passage, and inner and outer walls defining a water manifold, a water source fluidly connected to the water manifold for supplying water to the water manifold, a plurality of apertures passing from the manifold into the central exhaust flow passage, and a plurality of dispersion vanes, each dispersion vane aligned over a corresponding one of the plurality of apertures, whereby water supplied by the water source to the water manifold passes through each aperture and strikes a dispersion vane. The water striking the dispersion vanes forms a fine water mist having an increased available surface area for efficiently transferring the latent heat of vaporization from the exhaust flow to the water mist without causing a high back pressure in the exhaust flow passage.

Abstract: A device for cooling gases in which the gas to be cooled can be fed through channels (5) of a cooling device (1). Adjacent the gas channels (5) in the cooling device (1) are coolant channels (10) for a circulating coolant. In the cooling device, the channels (10) for the coolant are positioned centrally in the interior and the channels (5) for the gas to be cooled are positioned radially outwardly.

Abstract: A control system is described for optimizing the reduction of nitrogen oxides in exhaust gas produced by an internal combustion engine, especially those internal combustion engines that employ a lean air-fuel ratio. The control system employs a temperature control assembly that is capable of selectively heating the exhaust gas prior to introduction into the NOx catalyst system, thus rapidly bringing the temperature of the NOx catalyst system up to operating temperature.

Abstract: An exhaust gas purification system for a lean burn engine includes a thermal mass unit and a NOx conversion catalyst unit downstream of the thermal mass unit. The NOx conversion catalyst unit includes at least one catalyst section. Each catalyst section includes a catalytic layer for converting NOx coupled to a heat exchanger. The heat exchanger portion of the catalyst section acts to maintain the catalytic layer substantially at a desired temperature and cools the exhaust gas flowing from the catalytic layer into the next catalytic section in the series. In a further aspect of the invention, the exhaust gas purification system includes a dual length exhaust pipe upstream of the NOx conversion catalyst unit. The dual length exhaust pipe includes a second heat exchanger which functions to maintain the temperature of the exhaust gas flowing into the thermal mass downstream near a desired average temperature.

Abstract: Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.

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: A system for determining the effectiveness of a catalytic coating on a catalytic converter in a motor vehicle. The system provides a driver or maintenance staff status of the catalytic function provided by the catalytic coating on the catalytic converter which is downstream from a heat exchanger connected to a cooling system in an engine in a motor vehicle. The catalytic converter is arranged to be heated by an air flow passing through the catalytic converter. The catalytic coating on the catalytic converter converts environmentally harmful substances in ambient air into substances which are not harmful to the environment. The motor vehicle also includes a control unit and a sensor. The sensor is connected to the control unit and is able to determine a degree of conversion of one or more environmentally harmful substances by the catalytic coating on the catalytic converter.

Abstract: A device for use with a lean-burning internal combustion engine is disclosed. The device is comprised of a means for generating an air/fuel mixture for the cylinders of the engine in order to provide at least stratified and homogenous operation, an exhaust system connected to the engine, and an NOX-adsorbing catalytic converter arranged in the exhaust system. The device additionally has a heat exchanger that is fitted upstream of the catalytic converter, wherein the heat exchanger is used to adapt the temperature of the exhaust gas from the engine to an operating state of the catalytic converter.

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: An apparatus for treating the exhaust gas of internal combustion engine comprises an injector, a valve for shutting off the cooling water which flows into a cylinder head, an exhaust manifold increasing the fluidity of the exhaust gas, a close-coupled catalyst (CCC) increasing the activation of a catalyst with high loading operation in case of low temperate, an HC-absorber catalyst including an HC absorber and a TWC catalyst component for removing the HC component in the exhaust gas, and a electrically heated catalyst and a light off catalyst for removing the HC component at high temperate.

Abstract: An exhaust gas purification system for denoxing exhaust gases has a converter containing a substance thermolytically separable into NH3, a feed line connecting the converter with an exhaust gas line for supplying NH3 into the exhaust gas flow therein, a dosing device in the feed line for dosing the NH3 to be introduced into the exhaust gas flow, a heatable cold-start store connected to the feed line between the converter and dosing device for providing the substance during starting of a combustion unit connected to the exhaust gas line, an air feeding device having two air conduits provided with valves wherein one conduit is connected to the feed line between the cold-start store and dosing device and the other conduit is connected to a mixing chamber located in the feed line after the dosing device, and a reservoir container for storing the substance connected to a filling pipe terminating in the converter.

Abstract: This invention relates to an exhaust system with a catalytic converter for the exhaust gases of an internal combustion engine of a motor vehicle. The system comprises at least one heat exchanger having a cooling fluid therein, selector means for selectively directing the exhaust gases, wholly or partly, into the heat exchanger in order to cool them, and means for using the heat of the heat exchanger cooling fluid to heat the passenger compartment of the vehicle. The heat exchanger may be located upstream or downstream of the catalytic converter. The invention provides depollution of the exhaust gases and heating of the passenger compartment.

Abstract: An apparatus and method for the removal of carbon particles (soot), odor, gas and particulate from the exhaust of a diesel engine. The method includes a carbon (soot) collector which collects the carbon (soot) and noxious odor which is connected to the catalytic converter of the engine, then enters a heat exchanger for cooling and condensing a major portion of the exhaust into a liquid condensate. The condensate enters a first reactor which neutralizes any acids present in the condensate and passes through an automatic drain into a holding tank. The non-condensed gases flow into a second reactor connected to a holding tank. Gases are reacted in the second chemical reactor with a substance which absorbs the carbon monoxide and nitrogen oxide. The two reactors remove a large quantity of nitrogen oxides and particulate matter. The treated gases then flow into a the soot bath for removal of minute carbon (soot) particles and thence into a vapor remover.

Abstract: An exhaust gas cooling system for a vehicle includes a cooling fin system retrofit and a side exhaust pipe retrofit having an exhaust gas exit pipe having a first portion having a plurality of mixing portions which are either bends or internal mixing fins configured to mix vehicle exhaust gas, but not to restrict exhaust gas flow, a second portion fastened to the first portion and a chrome coated third portion fastened to the second portion and extending along the side of the vehicle. The cooling fin system retrofit includes an adjustable clamp and one or more cooling fins, each cooling fin having a base having a pair of upstanding arms, with one arm of the pair having a lip for engaging an arm of another cooling fin. An exhaust gas cooling system kit, a side exhaust pipe retrofit kit, a cooling fin kit are included.

Abstract: A two cycle engine comprising an induction system to induct fuel and air into said two cycle engine, at least one cylinder arrangement to combust the fuel and air mixture of said two cycle engine, and a piston arrangement disposed in said at least one cylinder arrangement. The at least one cylinder arrangement is configured to combust the fuel and air mixture of the two cycle engine during each two cycle movement of said piston arrangement. The engine also has an ignition system disposed to combust the fuel and air mixture in the at least one cylinder during each two cycle movement of the piston arrangement and an exhaust system to exhaust gases from the at least one cylinder. The exhaust system comprises a reactor and a precombustion chamber, the precombustion chamber is disposed between the at least one cylinder and the reactor. The engine also includes a heat exchanger configured and disposed to transfer heat from exhaust gases from the reactor to the precombustion chamber.

Abstract: Past exhaust emission control systems fail to utilize exhaust gas recirculation during all operating parameters of an engine. The present exhaust gas recirculation system reduces the emissions emitted from an engine during all operating parameters of the engine. The engine includes a cylinder, a rotatable crankshaft and a turbocharger defining a compressor section compressing a flow of intake air to a first preestablished pressure and being driven by a flow of exhaust gas having a first preestablished pressure. The exhaust gas recirculation system is comprised of a portion of the flow of exhaust gas being recirculated to the cylinder and forming a flow of recirculated exhaust gas. The flow of recirculated exhaust gas is cooled. The flow of recirculated exhaust gas is compressed to a second preestablished pressure being at least equal to the first preestablished pressure of the intake air. And, a quantity of the flow of recirculated exhaust gas is controlled depending on the operating parameter of the engine.

Abstract: The invention discloses a device for filtering internal combustion engine exhaust gases, comprising an electrostatic filtering chamber equipped with electrostatic filtering means, a line for supplying gases into the chamber, in fluid communication with an inlet of the chamber, at one of the ends of the supply line, the other end of the supply line being provided with an opening having an inlet orifice adapted to allow the penetration of the exhaust gases and of a flow of ambient air for cooling the exhaust gases. In this device, the means for drawing the exhaust gases and the air flow are mounted downstream of an outlet of the chamber, to allow the mixture of air and gases to pass into the said chamber and reject the filtered gases into the environment and a filter for coarse solid particles and droplets derived from the mixture is mounted in the chamber, upstream of the electrostatic filtering means.

Abstract: A method for controlling the temperature of an exhaust gas treatment system in the exhaust system of an internal combustion engine in the region of a predetermined intended temperature, comprising a two-position device for varying the temperature of the exhaust gases, a device for measuring the actual temperature and a device for determining a quantity which approximately represents a value for the input of energy into the exhaust gas treatment system is described, as is an apparatus for putting the method into practice. The actual temperature is compared with the intended temperature in a two-step control element and an output signal is produced.

Abstract: A catalytic converter includes a casing connected to the output from an exhaust gas and residue manifold of an engine, in particular an engine of a motor vehicle. The casing contains arrangements for oxidizing the exhaust gases and residues and for trapping the oxidized gases and residues. A central part of the casing houses cooling arrangements for reducing the temperature of the gases and residues upstream of the trapping arrangements below a predetermined threshold.

Abstract: An internal-combustion engine system includes an internal-combustion engine with a pertaining engine exhaust gas system, an emissions control device having an NO.sub.x storage catalyst arranged in the exhaust gas system, a lambda probe for detecting the engine air ratio and devices for the periodic desulfurization of the catalyst at a raised temperature and a rich air ratio of the latter, as well as to an operating process suitable for this system. The desulfurization devices comprise secondary air feeding devices for feeding secondary air into the NO.sub.x storage catalyst. During the desulfurization phases, the engine is operated at a rich air ratio and secondary air is metered into the catalyst.

Abstract: An exhaust recirculation of gases in internal combustion engines, notably for automobiles, which has a catalytic converter, recycling apparatus for recycling the exhaust gases and heat recovers apparatus for recovering heat from the exhaust gases. A single heat exchanger is arranged for cooling the recycled exhaust gases and recovering the heat energy from the exhaust gases for heating the passenger compartment of the vehicle and for protecting the catalytic converter from excessively high exhaust temperatures. Valves for diverting exhaust gases, a back-pressure valve and an EGR valve are controlled for this purpose by control electronics. The invention is particularly applicable to direct-injection petrol or diesel engines or to lean-mixture petrol engines.

Abstract: A heat exchanger for a motor vehicle exhaust includes an outer tubular body and an inner tubular body. The outer tubular body has peripheral sidewalls, an interior cavity, a first end and a second end. The inner tubular body has fluid impervious sidewalls formed out of a single length of conduit wound in a spiral coil. The spiral coil has an exterior surface and an interior surface. The inner tubular body is disposed within the interior cavity of the outer tubular body spaced from the peripheral sidewalls. This provides a first flow channel between the exterior surface of the inner tubular body and the peripheral sidewalls of the outer tubular body, and a second flow channel along the interior surface of the inner tubular body. The conduit of the spiral coil has an inlet end and an outlet end, whereby fluid is circulated through the coil.