Abstract: Methods and systems are provided for injecting water during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation. In one example, water is injected at one or more deactivated engine cylinders to reduce oxidation of the exhaust catalyst. Then, during engine cylinder reactivation, a degree of richness of a combustion air-to-fuel ratio may be reduced to decrease fuel penalty to the engine while reducing NOx emission.

Abstract: Methods and systems are provided for engine speed flare control in an engine system having multiple staged charge boosting devices. In one example, during an engine start, an upstream compressor is rotated backwards via an electric motor to reduce the intake manifold pressure. The engine is then fueled based on the lower manifold pressure to reduce torque and engine speed flare until idle engine speed conditions are reached.

Abstract: An exhaust gas discharge inducing apparatus installed at the end of an exhaust pipe of a vehicle. The exhaust gas discharge apparatus includes: two or more driving wind intake sets installed at a lower part of a vehicle to collect a driving wind generated during running of a vehicle and guiding the collected driving wind into an induction cover of the discharge inducing device mounted onto the end portion of an exhaust pipe through a driving wind passage pipe; and a discharge inducing device includes an exhaust gas passage pipe, a driving wind connection passage, and an induction cover. The exhaust gas passage pipe is connected to the exhaust pipe, and includes a plurality of exhaust gas outlets disposed at the end portion thereof.

Abstract: An exhaust manifold includes: an inlet portion which collects exhaust gas discharged through a first to a fourth exhaust ports; an outlet portion discharging the exhaust gas; and a tube portion connecting the inlet and the outlet portions. The inlet portion comprises: a first inlet portion one end of which communicates with the first and the second exhaust ports; and a second inlet portion one end of which communicates with the third and the fourth exhaust ports. Since the inlet portion is provided as two considering the combustion sequence, the productability and the economic feasibility can be enhanced, and the surrounding space can be enlarged to enhance the workability, and a simple exterior appearance can be obtained, and interference between exhaust gases can be effectively prevented, and since the size of the exhaust manifold can be increased, an engine load can be reduced to improve the fuel mileage.

Abstract: An apparatus for evacuating exhaust from an exhaust pipe of a vehicle having an external turbine and an internal turbine connected to the external turbine such that when the external turbine rotates the internal turbine rotates. An apparatus for evacuating exhaust from an exhaust pipe of a vehicle having an external turbine, an external motor assembly and an internal turbine connected to the external motor assembly such that the external motor assembly rotates the internal turbine, and the external turbine drives the external motor assembly when the external turbine reaches a greater rate of rotation than the external motor assembly.

Abstract: The present invention relates to a method and system for homogenizing exhaust from an engine. In one embodiment, the present invention includes an automobile. The automobile can include a fuel delivery unit, an engine, an exhaust system, and a control unit. The exhaust system can include a swirl inducement unit, multiple sensors, and multiple catalytic converters. The swirl inducement unit can homogenize an exhaust from the engine. The swirl inducement unit can include a plurality of vanes and/or a plurality of protrusions. The protrusions can be a plurality of bumps and/or a plurality of semi-circular rings. The plurality of vanes can be rotatable with the rotation of the vanes being controlled by the control unit. The rotation of the vanes can be based on an operating condition of the engine.

Abstract: The invention relates to engine construction, in particular to systems for regulating internal combustion engines. The invention makes it possible to reduce the toxicity of exhaust gases. A four-stroke reciprocating internal combustion engine is equipped with a vacuum valve. During the discharging of the exhaust gases, a vacuum pump pumps combustion products out of the cylinder via the vacuum valve. First of all, a discharge valve is opened, and the vacuum valve is opened later, after complete (or partial) closing of the discharge valve, and the vacuum valve is closed later on or at the same time as an inlet valve opens. The vacuum valve is situated in the exhaust pipe, and an additional shut-off valve is mounted downstream of said vacuum valve, along the path of the exhaust gases, the shut-off valve connecting the exhaust pipe to the exhaust manifold or disconnecting the exhaust pipe therefrom.

Abstract: A system is provided for inerting a volume in a vehicle has at least one exhaust gas extraction point on at least one internal combustion engine of the vehicle, and exhaust gas line for routing exhaust gas from the exhaust gas extraction point to the volume, and at least one exhaust gas inlet on the volume for introducing exhaust gas to generate a low-activity environment in the volume. Precisely in vehicles with internal combustion engines, using exhaust gas for inerting a volume makes it possible to suggest an especially simple, cost-effective and robust solution to guard against the formation of an ignitable mixture in the volume or the like.

Abstract: An apparatus for evacuating exhaust from an exhaust pipe of a vehicle having an external turbine and an internal turbine connected to the external turbine such that when the external turbine rotates the internal turbine rotates. An apparatus for evacuating exhaust from an exhaust pipe of a vehicle having an external turbine, an external motor assembly and an internal turbine connected to the external motor assembly such that the external motor assembly rotates the internal turbine, and the external turbine drives the external motor assembly when the external turbine reaches a greater rate of rotation than the external motor assembly.

Abstract: In an internal combustion engine having several combustion chambers formed in in-line cylinders wherein an air/fuel mixture can be combusted and which include a common cylinder head, with discharge passages formed within the cylinder head and extending to a common confluence zone in communication with a discharge manifold, the common confluence zone is delimited on a first side (A) by at least one cylinder head wall and a separate shell element on a second side mounted to the outside of the cylinder head, the shell element being curved funnel-like for conducting the exhaust gas away from the engine.

Abstract: A particulate matter concentration measuring apparatus configured to measure a particulate matter concentration in exhaust gas includes an exhaust gas extraction line that is branched from an exhaust line and has a flow passage cross-sectional area smaller than that of the exhaust line, a particulate matter detection filter provided in the exhaust gas extraction line and configured to catch particulate matter, a heating unit configured to heat the caught particulate matter, and a differential pressure detection unit configured to detect a differential pressure generated between an inlet and an outlet of the particulate matter detection filter. The heating unit is configured to apply about 50% or more of a calorific value for heating the particulate matter to an area making up about 30% of the particulate matter detection filter on an upstream side of an exhaust gas flow.

Abstract: Various systems and method are described for controlling an engine having an exhaust system which includes a particulate filter. One example method comprises, after shutting down the engine and spinning down the engine to rest, operating a vacuum pump to draw fresh air through the exhaust system to an intake system, and regenerating at least a portion of the particulate filter during the engine rest.

Abstract: An exhaust gas cooling apparatus and method for cooling an exhaust gas is provided. The exhaust cooling apparatus having a first fluid conduit having a variable nozzle opening disposed at one end of the first fluid conduit, the variable nozzle opening being defined by a shape memory alloy extending from the first fluid conduit; and a second fluid conduit having an inlet end and an outlet end, the variable nozzle opening being disposed in the second fluid conduit proximate to the inlet end of the second fluid conduit such that a fluid inlet opening is disposed about an outer periphery of the variable nozzle opening and an inner surface of the inlet end of the second fluid conduit, the shape memory alloy varying the size of the variable nozzle opening by moving toward or away from a center line of the first fluid conduit in response to a temperature of an exhaust gas flowing through the first fluid conduit.

Abstract: An apparatus for evacuating exhaust from an exhaust pipe of a vehicle having an external turbine and an internal turbine connected to the external turbine such that when the external turbine rotates the internal turbine rotates.

Abstract: This embodiment of this exhaust apparatus relates to an air intake device and a rotating blade assembly (50 and 51) which significantly reduce greenhouse gases, hydrocarbon and oxides of nitrogen emissions and other gases and pollutants not yet required to be tested, exhaust noise and temperature of the exhaust gases. By its chilling effect it also improves the efficiency of an internal combustion engine. An electric motor drive shaft (69) is coupled to the drive shaft (67) at the rear of the unit. The drive shaft (66) is attached to the centrifuge and rotating blade assembly (51) creating a vacuum which draws chilled exhaust gases into the unit. The vacuum helps to cool the engine and chill the gases. The gases are mixed and the resultant gaseous mixture exits from the blades into a mixture of exhaust gases (43) and chilled air (35), making a chilled air and exhaust gas mixture (58) exiting through a discharge port in the rear of the unit (65).

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 diffuser for a work machine having an air breathing fuel consuming internal combustion engine with an exhaust aftertreatment device periodically elevating the exhaust temperatures to a high level. The diffuser has a venturi section and the excess contaminants from an intake air pre-cleaner are directed to the throat of the venturi to aspirate and dispose of excess contaminants while cooling the exhaust flow. Additional openings in the divergent section of the diffuser assist in providing significant reductions in exhaust temperatures within a short axial envelope.

Abstract: A pulse detonation device for dividing a pulse detonation shock wave into an primary and control portion to reduce the strength of a propagating shock wave and/or change its direction. The device contains a flow separator which directs a portion of the shock wave into itself, thus reducing the shock wave's strength. In one configuration, the control region converges in cross-sectional area so as to accelerate the flow in the control region, while the primary region diverges to slow the flow in the primary region. The flow in the control region is directed, at an angle, into the flow of the primary region to impede and/or redirect the flow of the primary region.

Abstract: A system for storing an additive and for injecting the additive into exhaust gases of an internal combustion engine. The system includes a tank for storing the additive, an injector and a pump for conveying the additive from the tank to the injector via an injection line, and a purge device configured to force a purge gas to flow through the entire injection line either from the tank to the injector, or from the injector to the tank.

Abstract: An engine (FIG. 1-1) comprising of multiple cylinders designated (2-5) combustion cylinders and (2-6) for heat recovery steam cylinders, each cylinder having a piston connected to a common crankshaft. The combustion cylinders operate on a four stroke cycle and the heat recovery steam cylinders operate on a two stroke cycle. The exhaust gas from the combustion cylinders is pressurized by a compressor, driven by a turbine, before entry into the heat recovery steam cylinders. This happens during the intake/power stroke of the heat recovery steam cylinders, as the intake valve closes, after top dead center, heated pressurized water is injected into the cylinder and spontaneously turns to steam driving the receding piston down. This heated exhaust gas and steam is expelled from the heat recovery steam cylinders to drive the turbine which in turn drives two compressors, one to compress the exhaust gas and one to compress the intake air.

Abstract: The present invention provides an exhaust cooler mounted to a tailpipe for receiving exhaust gas. The exhaust cooler includes a jet pump connectable to the tailpipe and a nozzle connectable to the tailpipe. The nozzle defines a nozzle opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump. A first member is included that is moveable between a closed position and an open position, the open position defining a first opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump.

Abstract: A system for manipulating engine exhaust gases away from inhabited areas comprises an air pressurization system coupled in fluid communication to a housing. The housing is adapted to reside adjacent a terminal portion of an exhaust pipe so that pressurized air injected into the housing entrains the exhaust gases and disperses them from the housing.

Abstract: The invention relates to a dilution and dispersion device for the exhaust and/or cooling gases of a vehicle's engine, that incorporates blades and a hub. The hub of said device incorporates means intended to reduce the loss in the gaseous flow rate generated by said gases. The flow rate loss reduction means are constituted by one or several openings in said hub or by a profiled element allowing said gases to be defected towards said blades. The blades are fastened to a ring.

Abstract: A system for improving motor vehicle performance includes an air intake heat exchanger placed in-line with the air intake of the motor vehicle. The air intake heat exchanger is coupled to a source of pressurized media for selective application of the pressurized media to the air intake heat exchanger for cooling and drying intake air prior to reaching the intake manifold and ultimately the combustion chamber. The system further includes a flow inducing member positioned within the exhaust pipe of a motor vehicle. The flow inducing member is coupled to the source of pressurized media for selective application of the pressurized media in a manner which creates an increased flow within the exhaust system thereby increasing the flow through the air intake and intake manifold. A system for exhausting CO2 to an adjacent vehicle is also disclosed.

Abstract: In a waste heat recovery system wherein a heat exchanger derives heat from an engine exhaust, a venturi is fluidly connected to an engine exhaust port so as to thereby increase the flow rate and reduce the pressure in a manifold which is fluidly connected between the venturis and the heat exchanger. A fan is provided downstream of the heat exchanger to draw hot gases from the manifold, through the heat exchanger and discharge it to ambient. But when the fan is not operating during periods in which the engine is operating, the lower pressure manifold will draw ambient air in through the fan and through the heat exchanger, with the ambient air then being entrained in the exhaust gases being discharged from an exhaust channel downstream of the venturi. In one embodiment, a plurality of heat sources are provided with each having its own venturi connected to the common low pressure manifold.

Abstract: An exhaust gas flow circuit includes a pumping unit having an inlet communicating with the exhaust system, and an exhaust outlet, for pumping exhaust gas from the exhaust system to the exhaust outlet. A bypass passage is arranged in parallel flow relation with the pumping unit between the inlet and outlet. When the mass flow rate of exhaust gas is relatively high, a bypass valve opens the bypass passage providing a flow path for exhaust gas between the inlet and outlet in parallel with the pumping unit. When the mass flow rate of exhaust gas is relatively low, the bypass valve closes the bypass passage. The bypass valve can be controlled to open and close in response to engine speed or mass flow rate of exhaust gas, for example.

Abstract: An exhaust filtration system for filtering exhaust gases produced by an internal combustion engine may comprise a fan having an intake side and a discharge side and an air inlet operatively associated with the intake side of the fan. A filter having an inlet surface and an outlet surface is positioned adjacent the fan so that the inlet surface of the filter is positioned adjacent the discharge side of the fan. An influx tube connected to the internal combustion engine is positioned so that its outlet end is located adjacent the intake side of the fan, so that the fan draws in air from the air inlet and exhaust gases from the outlet end of the influx tube and discharges a mixture of air and exhaust gases from the discharge side and into the inlet surface of the filter.

Abstract: An internal combustion engine is provided with a vacuum pump (17) to remove burnt gases form the engine cylinders during an exhaust stroke. The vacuum applied by the pump (17) is sufficient to remove the gases during an exhaust stroke and also apply a force to lift the piston. A certain amount of torque is therefore generated during the exhaust strokes. In a similar manner and to similar effect a compressor (18) is provided to force fuel into the cylinders during induction strokes and also create a certain amount of positive torque.

Abstract: A method of operating a two-cycle internal combustion engine under low load conditions. A throttle is placed at the intake air system to reduce air intake into the engine cylinders. A pump is placed in the exhaust system, such that it creates reduced pressure downstream of the exhaust valves. In this manner, when the air intake ports close, the exhaust is evacuated and the air trapped in the cylinder is reduced. This permits fuel to be reduced so that the engine may operate in a low load state without losing combustion.

Abstract: An exhaust apparatus for a combustion engine having a combustion chamber and an exhaust pipe for conveying exhaust gas in an exhaust stream from the combustion chamber is disclosed, wherein the exhaust apparatus includes a fan member disposed downstream of the combustion chamber and substantially sealingly associated with the exhaust pipe and an air inlet for introducing air relative to the fan member whereby the fan member is driven by the exhaust stream and air so as to create an area of low pressure between the fan member and the combustion chamber whereby extraction of exhaust gas from the combustion chamber is facilitated.

Abstract: A diesel exhaust conditioning system removes harmful gaseous and particulate pollutants from the exhaust of a diesel engine, and also lowers the temperature of the emitted exhaust and of the shroud surrounding the pollution control components of the device. The system includes at least one combination catalytic converter and particulate filter, structured to operate at a sufficiently high temperature as to convert potentially harmful gaseous pollutants to innocuous substances, and which also collects and oxidizes carbon and hydrocarbon particles in the diesel exhaust to convert them to innocuous substances as well. The catalytic converter(s) is contained in an insulated canister for containing the heat generated by the catalytic reactions, with the insulation also serving to lower the outside temperature of the canister.

Abstract: The present invention relates to a compulsory discharging device for exhaust of vehicle of the type in which a driving motor which has a propeller is mounted at the end portion of the exhaust pipe such that the exhaust within said exhaust pipe can be compulsorily discharged. The operation of the driving motor is controlled by a digital controller which uses a signal line to pick up the frequency of a high voltage line of an igniting coil. The rpm of said driving motor can be proportionally controlled with respect to the rpm of the engine. The output shaft of the driving motor is coaxially mounted with a propeller and a mixing propeller with which the exhaust can be mixed with fresh air to reduce the concentration of the exhaust. Then the diluted exhaust is discharged. The exhaust generated from the combustion within the cylinder can be effectively and completely withdrawn such that the performance of the engine can be increased. The residue of carbon is reduced and the power of the engine is increased.

Abstract: A method for potentiating the performance of an internal combustion engine. The method includes the steps of providing an exhaust extraction booster at a piston chamber of an internal combustion engine for evacuating exhaust product from the piston chamber through an exhaust exit. The piston chamber is defined within a piston cylinder having a piston head reciprocating therein. A fuel mixture is ignited within the piston chamber so that the fuel mixture burns at least partially and produces a heated exhaust product within the piston chamber. The extraction booster is placed in fluid communication with the piston chamber for drawing the exhaust product from the piston chamber toward and across the booster. An exhaust dilution inlet is also provided between the piston chamber and the booster for permitting cooling fluid to dilute the heated exhaust product before the exhaust product reaches the booster thereby preventing fully heated exhaust product from being processed by the booster.

Abstract: A method and apparatus for actuating a direct source exhaust gas capture system for capturing and exhausting exhaust from a vehicle tailpipe which automatically starts when the ignition system of the vehicle is actuated prior to the engine starting, and which is operable to automatically restart when the vehicle returns to the vehicle storage facility.

Abstract: An exhaust apparatus for a combustion engine having a combustion chamber and an exhaust pipe for conveying exhaust gas in an exhaust stream from the combustion chamber wherein the exhaust apparatus includes a fan member disposed within the exhaust pipe and driven by the exhaust stream so as to create an area of low pressure between the fan member and the combustion chamber whereby extraction of exhaust gas from the combustion chamber is facilitated.

Abstract: A method and apparatus for producing an inert gas is described. Firstly, capture the exhaust from a gas fired internal combustion engine located on the site of an intended application. Secondly, pass the exhaust stream through at least one catalytic converter. Thirdly, cool the exhaust stream passing from the catalytic converter to a temperature that will not harm a gas compressor. Fourthly, pass the exhaust stream into the gas compressor and apply the compressed exhaust stream exiting the compressor directly to the intended application.

Abstract: A method for cooling the parts of an extractor valve assembly to workable levels by cooling a portion of the produced gases and mixing it with the newly produced gases to lower the average temperature of the gases produced which is seen by the valving means and by recirculating engine oil along the production tubes to precool the gases before they arrive at the valving means.

Abstract: A method for dehydrating and cleaning high pressure gases withdrawn from within the combustion chamber of an internal combustion engine including maintaining the gases at a high pressure and cooling the gases to cause condensation of water, entraining particulate matter in the water, and delivering the water to the normal exhaust system of the engine for disposal thru vaporization back to being exhaust gas.

Abstract: The present invention relates to a device for facilitating exhaust action of an internal combustion engine being used as a power-transmitting source of a vehicle, using a depression phenomenon resulted from induction and acceleration of air resistance due to forward movement of the vehicle (motor cars, vessels, airplanes or the like), thereby an output and a combustion efficiency of the internal combustion engine. To overcome problems of the forced exhaust method in the conventional internal combustion engine and improve the output and the combustion efficiency of the internal combustion engine, the present invention provides a device for facilitating exhaust action of the internal combustion engine comprising a guided flow depression device and a forced exhaust device, wherein combustion gases are exhausted by working fluids when the vehicle moves at a constant speed or more, and are exhausted by the forced exhaust device with the motor when the vehicle moves at a constant speed or less.

Abstract: An apparatus which is adapted to be retrofit onto a tailpipe of an internal combustion engine co-operates with the primary emissions control system of the engine to improve the overall performance of such control system. The apparatus includes a housing having an inlet connected to the tailpipe of the engine, and an exhaust gas treatment device in fluid communication with such inlet. Overall fluid pressure drop in the system is controlled by a fan which is powered by a motor mounted on the housing. The motor is powered by the engine, and is controlled according to pressure in the exhaust manifold of the engine. The exhaust treatment apparatus can include various elements, such as baffles, charcoal or particulate material.

Abstract: This invention relates to a muffler having a purifying system for separating solid contents and eliminating poisonous gases such as carbon monoxide by means of an electrolysis apparatus which continuously provides oxygen separated from water to react with the carbon monoxide into carbon dioxide.

Abstract: An exhaust control system for assisting in discharging exhaust gases to control exhaust noise and increase engine performance by reducing back-pressure and lower piston exhaust resistance, and rapidly lowering the temperature of exhaust gases in internal combustion engines and of superheated gases or fluids in other thermodynamic processes through a uniquely short transit distance. The system is comprised of a housing having a aerodynamically designed air intake section, a dual section rotary hollow blade assembly, and an exhaust section. The intake section has a ball mouth designed to accelerate intake air into the dual section rotary blade assembly receiving exhaust gases or superheated steam or fluids. The accelerated air and rotary blade draw exhaust gases from the engine exhaust manifold of an internal combustion engine and expel them through an exhaust section. The rotary hollow blades are driven by a belt driven pulley and shaft extending outside the intake section.

Abstract: A compound internal combustion engine includes a piston type internal combustion engine drive coupled with a gas turbine, the piston engine exhaust gases driving the turbine whose exhaust preheats the piston engine air intake and then enters the suction input of a multistage turbocompressor driven by the gas turbine and having interstage cooling the output of the compressor discharging to exhaust.

Abstract: A power system is provided which consists of an internal combustion engine, a compressor to compress the air used in operating the engine, a pair of heat exchangers wherein the fuel for operating the engine is preheated by exhaust gases wherein the fuel is contacted indirectly, first in a low temperature zone with exhaust gas from a high temperature zone then contacted indirectly with the exhaust gases in the high temperature zone, wherein the exhaust gases are preferably boosted in velocity between the high temperature zone and the low temperature by a screw type booster fan and wherein the exhaust gases recovered from the low temperature zone are then preferably passed through one or more turbines to further recover energy.

Abstract: A four-cycle internal combustion engine is provided with apparatus comprising a turbine in the inlet air flow path and an extracting compressor in the exhaust gas path. Where the internal combustion engine is an automobile engine and is operating under normal cruising conditions, the manifold inlet pressure is substantially less than atmospheric pressure and incoming air drives the inlet turbine to in turn drive the compressor. The arrangement is such that the inlet air is isentropically expanded while the exhaust gas back pressure is decreased. As a consequence, the energy of compression is reduced and the overall operating temperature of the internal combustion cycle is lowered with the result that more power is delivered for a given quantity of fuel.

Abstract: An apparatus for the thermal-catalytic abatement of hydrocarbons, carbon monoxide, nitrogen oxides and particulates from effluent gas streams. The apparatus has a preheat section wherein the effluent is heated to 400.degree.-1000.degree. F by hot combustion gases. The effluent and combustion gases are directed by a baffle through a filter where combustible particulates are incinerated and noncombustible particulates are collected. The baffle followed by a diffuser cone, axially located on the filter, intimately mixes the effluent with the combustion gases so as to provide uniform flow and temperature distribution of the mixed gases across the filter. The filtered gases then pass through a catalytic reactor section containing a catalyst, preferably catalyst-coated ceramic honeycombs. In the presence of the catalysts the hydrocarbons and carbon monoxide in the heated gas stream are oxidized to carbon dioxide and water and the nitrogen oxides are reduced.

Abstract: A device for securement to or incorporating into the exhaust assembly of an internal combustion engine to improve efficiency thereof is disclosed. The device comprises a generally tubular housing open at both ends to enable passage of exhaust gases and a flow of air therethrough, and an axle coaxially positioned within the housing on a laterally extending support member, and a hub rotatably mounted on the axle, and two identical and opposed radially extending blades secured to the hub, the blades being obliquely angled with respect to the longitudinal axis of the hub, at least the forward edge of each blade extending inwardly providing inwardly pointing projections. In preferred construction, the inwardly pointing projection is formed between the forward edge of the blade and a forward inner edge of the blade, the said edges defining therebetween an angle of about 66.degree. - 67.degree.. In a further embodiment, at least the leading portion of each blade lies in a plane at an angle of about 72.degree.

Abstract: A motor vehicle drive system in which an internal combustion engine is operatively connected to a gas turbine installation. A compressor is interposed between the engine and the turbine installation so as to receive directly the exhaust gases from the piston engine and thereby prevent the development of a back pressure upon the exhaust system.

Abstract: An emission control system for an internal combustion engine cools the exhaust gases sufficiently to condense a substantial portion of the pollutants as a separable liquid or solid phase. The engine exhaust gases are initially cooled and then compressed, again cooled, and work-expanded in an open reversed Brayton cycle to obtain a significant temperature decrease. The resulting cooled gases from this the pollutants are readily separated may be employed to provide refrigeration or air-conditioning for moving vehicles.