Abstract: An exhaust gas purification system for an internal combustion engine includes a dual passage portion having a first passage and a second passage which are connected in parallel to each other. In the first passage, a first catalyst constructed of lean NOx catalyst is located and further a second catalyst constructed of oxidizing catalyst or three-way catalyst is located downstream of the first catalyst. In the second passage, a third catalyst constructed of oxidizing or three-way catalyst is located. A flow switching valve is provided so as to switch the flow of exhaust gas between the first passage and the second passage. The flow switching valve is switched so that exhaust gas flows through the third catalyst when the engine is being warmed-up and flows through the first catalyst and the second catalyst after the engine has been warmed-up.

Abstract: Trap muffler apparatus with bypass around a trap core is disclosed. A preferred bypass arrangement utilizing a tubular shutter valve system is described. Forward or reverse regeneration are possible. Bypass to atmosphere without filtration is avoided with dual in-line traps or with the segmented trap and control of exhaust gases to traps not being regenerated.

Abstract: An automotive internal combustion engine is equipped with a hydrocarbon adsorber for the purpose of controlling the emissions of unburned hydrocarbons from the vehicle's tailpipe. Regeneration of the adsorber is achieved by an electronic engine controller operating an air pump and a sample pump, using information from an exhaust gas oxygen sensor.

Abstract: An exhaust emission control system for a motor vehicle is disposed in an exhaust path, comprises a first catalyst for purifying an exhaust gas during activation of an engine, a second catalyst disposed downstream of the first catalyst and including a lean NOx catalyst, a bypass detouring the first catalyst, a select valve for controlling the amount of exhaust gas to be introduced into the bypass and first catalyst, and a control unit for controlling the select valve and flow of the exhaust gas according to operating status of the engine.

Abstract: The invention relates to an exhaust gas conduit of an internal combustion engine with a starting catalyser which is arranged near the engine and in whose casing a central passage surrounded by a catalyser body is provided. The central passage is controllable by means of an exhaust gas butterfly valve in such a way that the exhaust gas flows through the catalyser body when the butterfly valve is closed and is led through the central passage when the butterfly valve is open. In order to prevent overheating of the starting catalyser after the main catalyser starts, a pipe section of the exhaust gas conduit is provided which starts from an inlet flow end casing section, protrudes into the central passage so as to form an annular passage and ends at an upstream distance from the exhaust gas butterfly valve.

Abstract: An exhaust gas purification system for an internal combustion engine includes a catalyst installed in an exhaust conduit of an engine and constructed of zeolite carrying at least one kind of metal selected from transition metals and noble metals to reduce nitrogen oxides included in the exhaust gas from the engine under an oxidizing gas condition and in the presence of hydrocarbons. The system further includes means for repeating a cycle of cooling the catalyst and then stopping the cooling to allow the catalyst to rise in temperature so that the temperature rising courses of the catalyst are positively and repeatedly produced. Since the catalyst can show a higher nitrogen oxides reducing ability in the temperature rising course than in the temperature lowering course, the NOx purification rate is greatly improved due to the positive production of the temperature rising courses.

Abstract: The exhaust gases of a two-bank internal-combustion engine are guided, by way of exhaust gas collectors, to a central expansion chamber of a housing. From there, they flow through main catalysts arranged on opposite ends of the housing, before they are guided into the open air by way of end mufflers.This exhaust system provides a space-saving arrangement of all components required for an optimal emission control, and low exhaust gas back pressure, and meets all acoustic requirements.

Abstract: An HC adsorbent and a first three-way or oxidation catalyst are installed in an exhaust conduit of an internal combustion engine in that order in a flow direction. A second three-way or oxidation catalyst is installed upstream of the HC adsorbent in the exhaust conduit. When the exhaust gas flows through the second catalyst, the thermal energy of the exhaust gas is compensated for warming-up the second catalyst in a cold period. As a result, the warming-up of the HC adsorbent is delayed and the HC adsorbent can adsorb the HC included in the exhaust gas for a relatively long period. After the second catalyst has been warmed-up, the HC included in the exhaust gas flowing into the HC adsorbent is oxidized. As a result, the HC adsorbent is prevented from being saturated for a short period of time.

Abstract: A device for removing for particulates a diesel engine having a filter arranged in the flow of the exhaust gas, a heater for heating the filter, and an air pump or obtaining a flow of air for incineration of the particulates trapped by the filter when it is clogged. The amount of the air for the incineration of the filter is calculated in accordance with the amount of the particulates remaining in the filter at the peripheral zone thereof just after the preceding incineration cycle.

Abstract: A vehicle internal combustion engine exhaust system featuring two different exhaust routes to which the exhaust gas is directed selectively by an on-off device; the system also comprising a device for comparing parameters, consisting in engine speed, the opening angle of the throttle, and the vacuum inside the intake manifold and/or engine load, with respective predetermined values, for opening the on-off device upon the above parameters reaching the aforementioned predetermined values, and so selectively enabling the exhaust gas to flow along both the exhaust routes.

Abstract: A muffler-filter apparatus having a particulate trap using filter tubes with high temperature filter materials, like fiber in the form of yarn, woven yarn mat, or a non-woven, random array fiber mat, or various foams. Filter tubes have various structural configurations and are regenerated by axial propagation using ring heaters or stub rod heaters, by heating the entire length of the filter tube with a rod heater or some other full-length heater configuration. For regeneration, exhaust flow is bypassed using various valve configurations including a poppet valve, a shutter valve, or a tubular valve. Filter tube filters may also be self-regenerated by the heat from the exhaust gases as controlled by a throttle valve or on inclusion of fuel additives which lower particulate ignition temperature.

Abstract: Parameters which are related to the rate at which particulate matter accumulates and is reburnt, are monitored and the time at which a regeneration is required and/or the length of time a regeneration should be induced, are derived based on the same. The temperature at the inlet and outlet of a trap in which particulate matter is accumulated are monitored and measures such as throttling the induction and exhaust are implemented in addition to energizing a heater disposed immediately upstream of the trap as required in order to elevate the trap temperature and to induce and maintain the reburning during a trap regeneration.The pressure differential across the trap can be used to determine the amount of incombustible matter (ash) which has a accumulated in the trap and to modify the regeneration timing.When the temperature of the exhaust gases cannot be raised sufficiently, a by-pass is opened to attenuate cooling of the trap by the low temperature gases.

Abstract: In an exhaust system for an internal combustion engine having a main exhaust conduit with a catalytic converter arranged remote from the engine and a bypass exhaust conduit which includes a start-up catalytic converter arranged close to the engine and joins the main exhaust gas conduit ahead of said remote catalytic converter, an ejector structure is arranged in the main exhaust gas conduit within a housing defining a suction chamber in communication with the bypass exhaust conduit for drawing gas through the bypass exhaust conduit into said main exhaust gas conduit whenever exhaust gas flows from the engine through the main exhaust gas conduit and a main exhaust conduit valve is arranged between the ejector structure and the junction of the main and the bypass exhaust conduits which is closed during start-up operation of the engine to thereby force the exhaust gas to flow through the suction chamber and the bypass exhaust gas conduit via the start-up catalytic converter.

Abstract: A simple, low cost and reliable total particulate (soot, polynuclear aromatic and aliphatic hydrocarbons and ash) control system is disclosed that separates the particulate burning process from the body of a particulate filter and that needs very little compressed air to regenerate. The system can retrofit any existing diesel-powered equipment. The particulate control system includes a stationary ceramic monolith trap that is regenerated by one or more pulses of high-pressure and low-velocity air that move in the opposite direction of the engine exhaust flow through the trap. The particulate control system in a single trap embodiment conducts the engine exhaust to the atmosphere during regeneration periods, and in a dual trap embodiment, conducts the engine exhaust through two traps that are operated alternatively such that while one is filtering the exhaust the other is being regenerated, and vice versa.

Abstract: An exhaust gas purification system for an internal combustion engine includes a dual passage portion having a first passage and a second passage which are connected in parallel to each other. In the first passage, a first catalyst constructed of lean NOx catalyst is located and further a second catalyst constructed of oxidizing catalyst or three-way catalyst is located downstream of the first catalyst. In the second passage, a third catalyst constructed of oxidizing or three-way catalyst is located. A flow switching valve is provided so as to switch the flow of exhaust gas between the first passage and the second passage. The flow switching valve is switched so that exhaust gas flows through the third catalyst when the engine is being warmed-up and flows through the first catalyst and the second catalyst after the engine has been warmed-up.

Abstract: Trap muffler apparatus with bypass to a common reactive acoustic element is disclosed. Bypass structure varies from external bypass to a common acoustic element to annular bypass of the ceramic filter to axial bypass through the middle of an annular ceramic filter. Forward or reverse regeneration are possible. Bypass to atmosphere without filtration is avoided with dual in-line traps or with the segmented trap and control of exhaust gases to traps not being regenerated.

Abstract: In an internal combustion engine incorporating an exhaust driven turbocharger and an exhaust purification device, a valve means located at the diverging point of a branched exhaust duct with separate conduits leading to the turbocharger turbine and exhaust purification device. The valve means acts to alternately direct engine exhaust gas into a conduit leading to an exhaust purification device, or into another conduit leading to the turbine of a turbocharger, depending upon the particular fuel and fuel/air mixture utilized.

Abstract: Parameters which are related to the rate at which particulate matter accumulates and is reburnt, are monitored and the time at which a regeneration is required and/or the length of time a regeneration should be induced, are derived based on the same. The temperature at the inlet and outlet of a trap in which particulate matter is accumulated are monitored and measures such as throttling the induction and exhaust are implement in addition to energizing a heater disposed immediately upstream of the trap as required in order to elevate the trap temperature and to induce and maintain the reburning during a trap regeneration. The pressure differential across the trap can be used to determine the amount of incombustible matter (ash) which has accumulated in the trap and to modify the regeneration timing. When the temperature of the exhaust gases cannot be raised sufficiently, a by-pass is opened to attenuate cooling of the trap by the low temperature gases.

Abstract: Parameters which are related to the rate at which particulate matter accumulates and is reburnt, are monitored and the time at which a regeneration is required and/or the length of time a regeneration should be induced, are derived based on the same. The temperature at the inlet and outlet of a trap in which particulate matter is accumulated are monitored and measures such as throttling the induction and exhaust are implement in addition to energizing a heater disposed immediately upstream of the trap as required in order to elevate the trap temperature and to induce and maintain the reburning during a trap regeneration.

Abstract: A method for removing hydrocarbons from a stream of compressed air for use in a compressed air supply and delivery system of the type wherein a supply of compressed air is provided by a lubricated or non-lubricated air compressor includes the passing of the compressed air from the lubricated air compressor through a catalytic oxidation system to remove hydrocarbons, including vapor phase hydrocarbons, from the compressed air stream. The method contemplates feeding the stream of compressed air from an outlet of the air compressor to a treatment station, which treatment station utilizes a catalytic oxidation system to remove the hydrocarbons from the compressed air stream, thereby oxidizing the hydrocarbons into carbon dioxide and water and removing a predetermined, relatively high percentage of existing hydrocarbons from the compressed air stream prior to reaching downstream portions of the delivery system and any connected utilization apparatus.

Abstract: A catalytic converter for use in the exhaust system of an internal combustion engine having a rigid outer canister with a catalyst support disposed therein for movement between a first position adjacent in inlet end of the canister and a second position located in spaced relationship with said inlet end. In its first position, the substrate seals the inlet thereby forcing the entire exhaust flow through the fluid flow passages within the catalyst support which are in axial alignment with the converter inlet. The effect of forcing the totality of flow reduced volume of the substrate to the entire thermal energy of the exhaust stream thereby assisting in a reduction in the catalyst light-off time. Following catalyst light-off, the catalyst support is moved to its second, spaced position in which the entire frontal area of the converter is exposed to the exhaust flow thereby lowering backpressure of the converter and preventing converter overtemperature problems.

Abstract: A catalytic converter assembly for a motor vehicle having an internal combustion engine includes a housing being penetratable by exhaust gas and having at least one inlet, at least one outlet and a given cross-sectional area. A catalytic converter, especially a starting catalytic converter, is disposed in the housing and fills a portion of the given cross-sectional area defining a bypass route remaining free for the exhaust gas traveling past the catalytic converter. At least one flow baffle is disposed in the housing in the form of a flap being adjustable under the influence of temperature. The flap occupies a first position directing the exhaust gas through the catalytic converter at relatively low temperatures. The flap occupies a second position forming a partition between the catalytic converter and the bypass route in at least in some regions for directing the exhaust gas through the bypass route at relatively high temperatures.

Abstract: An exhaust gas purification device for purifying exhaust gas of an engine, having an absorbent trapper absorptive of hydrocarbons in the exhaust gas up to a first gas temperature such as 200.degree. C. while releasing the absorbed hydrocarbons in the exhaust gas above a second gas temperature such as 400.degree. C., and a passage system responsive to the gas temperature for conducting the exhaust gas from the engine to pass through the absorbent trapper until the gas temperature rises up to the first gas temperate, to bypass the absorbent trapper when the gas temperature exceeds the first gas temperature, and to pass through the absorbent trapper and the catalytic converter in this order when the gas temperature exceeds the second gas temperature.

Abstract: In an internal-combustion engine, in particular a diesel engine, with an exhaust-gas filter and an exhaust gas recirculation, the exhaust counter-pressure prevailing upstream of the exhaust-gas filter is used as one of a number of controlled variables for automatically controlling the exhaust gas recirculation. Since the exhaust-gas filter experiences flow resistance variations, particularly if it is a soot burn-off filter, which variations are independent of engine operation and consequently falsify the automatic control of the exhaust gas recirculation, the respective instantaneous exhaust-gas filter flow resistance must be measured as a correcting quantity and taken into account.

Abstract: An engine exhaust system and method of controlling hydrocarbon emissions are provided. The system and method are based on the use of two catalytic converter chambers, a first chamber containing a catalytic material and a second chamber containing catalyst as well as molecular sieves capable of adsorbing hydrocarbons during engine start-up and of having hydrocarbons desorbed therefrom when the catalysts reach an effective converting temperature. According to the invention, engine exhaust is selectively conveyed to each of the two converters in a manner such that initially produced hydrocarbon is withheld in the system by the molecular sieves in order to be recycled through the converters and brought into contact with the catalyst after an effective converting temperature has been attained.

Abstract: A method of removing solid particulate matter from the exhaust of a diesel engine, which comprises passing the engine's exhaust flow through at least a part of filter means to trap solid particulate matter contained initially in the exhaust, thereby to remove said matter from said exhaust flow, interrupting the exhaust flow through at least said part of the filter means, at a time when the preceding period of exhaust flow therethrough is of sufficiently brief duration that the trapped particulate matter has not become resistant to subsequent combustion in the engine, during said interruption backflushing at least said part of the filter means thereby to dislodge from the filter means, and entrain, said solid particulate matter for the purpose of removing it from the filter means, and transporting said dislodged solid particulate matter to the intake of said engine so that said matter can be combusted in the engine; and apparatus for accomplishing same.

Abstract: An oxidizing device with a microprocessor control means for removing soot and other particulates from the exhaust gases of a diesel engine having an enclosure with a forward inlet for receiving diesel engine exhaust, a main flow path through the enclosure having a medium for trapping soot and other particulates, a bypass through the enclosure for diverting flow from the main flow path, heating elements embedded in the trapping medium, and a microprocessor control means for selectively regenerating the trapping medium in accordance with certain sensed conditions relating to the status of engine operation and the condition of a particulate trapping medium that is disposed in the main flow path.

Abstract: A branched exhaust system having a particular filter in at least one branch thereof has valves in each branch operable by control means to route exhaust gases along any selected branch. Thus when the filter in one branch requires regeneration that branch can be closed. The control means is also operable in response to an exhaust braking demand signal to maintain all valves closed so as to at least restrict the flow of exhaust gas and so apply back pressure to the engine; to apply exhaust braking.

Abstract: A flattened profile emission oxidizing device for removing soot and other particulates from the exhaust gases of a diesel engine having an enclosure with a forward inlet for receiving diesel engine exhaust, a main flow path through the enclosure, a bypass through the enclosure for diverting flow from the main flow path, and a control means for selectively controlling the flow through the main flow path and the bypass in accordance with certain sensed conditons relating to the status of engine operation and the condition of a particulate trapping medium that is disposed in the main flow path. The main flow path has an electrostatic precipitator that is disposed in underlying relationship to the particulate trapping medium in the main flow path and a series of vanes are disposed in underlying relationship to the electrostatic precipitator and serve to redirect the exhaust flow passing through the main flow path and distribute the exhaust flow over the electrostatic precipitator and the trapping medium.

Abstract: A system is provided for reducing detectable hydrocarbons in the exhaust gas of a diesel engine and for retarding the formation of sulfate including a housing having an inlet and an outlet, a first exhaust gas glow passage extending from the inlet to the outlet within the housing, a first catalyst bed positioned within the first flow passage, a second exhaust gas flow passage extending from the inlet to the outlet within the housing, and a second catalyst bed positioned within the second flow passage. Also provided is a valve for directing the flow of the exhaust gas through one of the first and second flow passages, and an electronic control for controlling the valve in response to engine load and exhaust gas temperature such that the exhaust gas is directed through the first flow passage and the first catalyst bed under low engine load and low exhaust gas temperature conditions and through the second flow passage and the second catalyst bed under high engine load and high exhaust gas temperature conditions.

Abstract: A diesel engine exhaust filtration system and method which removes both diesel particulate matter (DPM) and unburned hydrocarbons (UHC) from the exhaust gases. Two filters in parallel are used, each alternating operation as the other regenerates. Each filter is preferred to be constructed in a conventional manner and operates at between 100 to 300 degrees Centigrade. A microprocessor controlled valve system regulates which filter is active and which is regenerating and/or inactive. DPM accumulates at the active filter, with UHC condensing on the DPM. When the active filter becomes clogged, the microprocessor switches it to inactive status, and switches the other filter to active status. Low temperature regeneration is initiated by the microprocessor in which DPM and UHC burn slowly across the entire filter. A recirculation conduit provides for the gases produced by the regeneration to be directed to the air intake of the diesel engine.

Abstract: An exhaust gas purification system for an internal combustion engine using an alcohol blended gasoline fuel includes a lean NOx catalyst capable of reducing nitrogen oxides under an oxidizing gas condition and in the presence of hydrocarbons. A bypass conduit is provided with a bypass valve so as to bypass the lean NOx catalyst. Opening of the bypass valve to cause the exhaust gas to flow through the bypass conduit is controlled in accordance with the alcohol concentration of the fuel. When the alcohol concentration is low, the bypass valve opening range is limited to a high engine speed and high engine load range, so that the exhaust gas is caused to flow through the lean NOx catalyst at low and medium engine speeds and low and medium engine loads, and the catalyst is utilized at a maximum.

Abstract: A regeneration system for a particulate trap provided in an exhaust pipe of an engine in which the regeneration is initiated when the pressure loss across the trap has reached a preset value and then the preset value is renewed when the peak value of the trap temperature through the regeneration resides outside a predetermined range or when the pressure loss after the regeneration exceeds the preset value even though the peak value resides within said predetermined range, and the initial value of said preset value is determined on the basis of the minimum value within the variation of the pressure loss of cleaned traps.

Abstract: A system for purifying the exhaust gases of a diesel engine comprises an exhaust gas line, which is branched to form two branch lines, which are adapted to be shut off in alternation by change-over valve means. One of said branch lines constitutes a filter line, which incorporates a soot filter. The other branch line constitutes a by-pass line. Downstream of the soot filter the filter line joins the by-pass line to form a common end line. In dependence on the load on the engine, the filter line is opened by the change-over valve means only during an operation of the engine under a full load or under a partial load in excess of a predetermined value. In order to ensure that the exhaust gas will almost entirely be purified during an operation of the engine throughout its load range, an diesel soot oxidation-inducing catalyst is provided downstream of the change-over valve means and is incorporated in the by-pass line or in the common end line.

Abstract: A particulate trap system for use in the exhaust system of an internal combustion engine has an exhaust conduit with a main branch, a bypass branch, and an exhaust pressure regulating valve disposed within the main branch for selectively diverting exhaust gas through one of the branches. A particulate filter is disposed within the main branch and a burner assembly, having an outlet disposed upstream of the filter, is operable to raise the temperature of the filter to a level sufficient to incinerate particulates thereon. The exhaust pressure regulating valve is configured to act as a metering orifice when in a restrictive position so as to supply a metered amount of exhaust air to the burner while channeling a substantial portion of the exhaust flow through the bypass branch during the regeneration cycle of the system.

Abstract: A particulate filter trap regeneration system and control mechanism is disclosed including a downstream vent tube section across which a pressure signal is derived as an analog of the exhaust gas stream velocity flowing through the particulate trap. A novel particulate loading parameter formula is disclosed by which the maximum acceptable pressure drop across a loaded particulate trap may be calculated and related to exhaust gas flow through the trap in order to determine when particulate trap regeneration should commence. In one embodiment, a vent tube equipped with a venturi throat for increasing the accuracy of the pressure signal indicative of exhaust gas stream velocity is disclosed along with representative dimensional parameters.

Abstract: An exhaust system of an internal-combustion engine is provided with a small catalyst as a starting catalyst and wherein this small catalyst is longitudinally movably or pivotedly movable into or out of the exhaust pipe of an internal-combustion engine. When exhaust gas flow from the engine is strong, the catalyst is moved into a dead space lateral chamber with respect to the flow in the exhaust pipe.

Abstract: A unitary system for removing particulates from the exhaust gas of an internal combustion engine includes a main flow passage and a by-pass flow passage for conducting the exhaust gas from an inlet portion to an outlet portion of a housing which contains the system. A valve for selectively directing the exhaust gas through one of the passages is provided, with a particulate trap mounted in the main flow passage for trapping particulates within the exhaust gas when the exhaust gas is directed therethrough. A regeneration system is positioned intermediate the valve and the particulate trap with an oxidation catalyst being positioned downstream of the particulate trap and in both the main flow passage and the by-pass flow passage. Further, a control system is provided for selectively activating and deactivating the regeneration system in response to predetermined operating conditions of the unitary system.

Abstract: An exhaust processor is provided for filtering particulate matter from a combustion product. The exhaust processor includes a housing providing a main passageway having a substrate mounted therein for solid particle filtration. The housing also provides an auxiliary passageway containing a muffler for attenuating noise of combustion product. Combustion product is diverted through the auxiliary passageway after the substrate collects a predetermined amount of solid particles from combustion product to permit regeneration of the substrate by a burner.

Abstract: In a diesel engine exhaust system a plurality of valved ceramic filters are connected in parallel in the exhaust stream and loaded sequentially. While one filter is preferentially loaded, a second filter is opened to the exhaust stream when backpressure reaches a predetermined value. The secondary filter is removed from the exhaust stream when air flow to the engine drops a discrete amount below a peak air flow determined by the backpressure which would cause the secondary filter to be placed in the exhaust stream. The preferentially loaded filter is bypassed when completely loaded and regenerated. The secondary filter is then preferentially loaded and the sequence continues.

Abstract: A system for reducing the emission of condensed unburned fuel from diesel engines is disclosed. The system includes an exhaust gas flow passage having a particulate filter positioned therein for trapping particulate matter entrained within the exhaust gas and a burner for selectively elevating the exhaust gas temperature. Sensors are provided for continuously monitoring the ambient air temperature and the exhaust gas temperature and relaying values indicative of these temperatures to a control module. The control module in turn compares these determined values to predetermined minimal values. If both the ambient air temperature and the exhaust gas temperature are less than the predetermined minimal values, the control module will activate the burner in order to raise the exiting exhaust gas temperature to reduce the emission of condensed unburned fuel.

Abstract: An exhaust processor is provided for filtering particulate matter from a combustion product. The exhaust processor includes a partition situated inside a housing to form a first flow passage and a second flow passage in an upstream portion of the housing. A main substrate is mounted in the first flow passage for solid particle filtration. An auxiliary substrate is situated in the second flow passage to filter combustion product passing through the second flow passage during regeneration of the main substrate. A muffler is situated in a downstream portion of the housing and is arranged so that the entire spacial volume of the muffler can be utilized by combustion product passing through either the first or second flow passages.

Abstract: A method and apparatus for cleaning of a soot filter in the exhaust line of a diesel engine with a combustion chamber placed in front of the soot filter where a fuel nozzle and an adapted electrical ignition mechanism is built in thereby enabling an after burning of the exhaust without secondary air. The exhaust in the combustion-chamber is mixed with the fuel, which is injected through the fuel nozzle, and ignited by an ignition-device with the existing portion of the unburned oxygen. The hot exhaust effects the burn down of the accumulated soot in the soot filter.

Abstract: A particulate trap system for use in the exhaust system of an internal combustion engine has an exhaust conduit with a main branch, a bypass branch, and a diverter valve disposed therebetween for selectively diverting exhaust gas through one of the branches. A particulate filter is disposed within the main branch, and a burner assembly having an outlet disposed upstream of the filter is operable to raise the temperature of the filter to a level sufficient to incinerate particulates thereon. A burner supply conduit extending between the exhaust conduit and the burner, having a metering orifice disposed therein, supplies exhaust air to the burner when the diverter valve closes the main branch and channels the exhaust flow through the bypass branch during the regeneration cycle of the system.

Abstract: A Diesel engine exhaust particulate purging apparatus includes sensors (11a, 11b) for detecting the quantity of particulates accumulating in a trap (2), a temperature sensor (10) disposed on the upstream side of the trap for measuring the temperature of exhaust gas flowing into the trap (2), and a control device (12) for controlling current supply to an electric heater (8) and for controlling an open--close operation of a bypass control valve on the basis of output signals from the accumulated quantity detecting means (11a, 11b) and the temperature sensor (10).

Abstract: A device for collecting and removing particulate emissions from diesel engine exhaust before the exhaust is discharged into the atmosphere. The device comprises an enclosure having an inlet, an outlet, a main flow path, containing a medium for trapping and removing particulate material, a by-pass for diverting the exhaust flow around the main flow path, a heating unit to initiate forced regeneration of the medium and a control system for regulating the forced regeneration of the medium and the flow through the main and by-pass flow paths. In a first aspect of the invention the regeneration of the medium and the flow through the main and by-pass flow paths are regulated by a pair of valves, a thermocouple, engine sensors, and a back-pressure switch. In a second aspect of the invention, a single valve and microcomputer are used in place of the pair of valves and in conjunction with the thermocouple regulate the flow through the main and by-pass flow paths and the regeneration of medium.

Abstract: Combinations of split and valved exhaust ports are provided in a ported two cycle engine with divided emission control system to provide better control of the division of exhaust gas flow to the two converters.

Abstract: A two-stroke cycle spark ignition cylinder fuel injection engine is provided with an exhaust emission control system that separately treats hot blowdown gases and uses the hot treated gases to warm the scavenging gases for further treatment. Various exhaust gas separation concepts are described for use in separating the blowdown and scavenging portions of the exhaust gas discharged from the cylinder exhaust ports.

Abstract: The invention relates to a soot-particle filter which is arranged in the exhaust-line system of an internal-combustion engine and which can be bypassed by means of a bypass line closable under full load. So that the vehicle can accelerate smoothly out of low speed ranges under full-load conditions, even when the filter is clogged, the bypass line is opened only when the speed of the internal-combustion engine is below a first speed limit value during its warm-up phase, when the speed of the internal-combustion engine is below a second speed limit value under hot-running conditions, and when, with the soot-particle filter clogged, the internal-combustion engine load is simultaneously below a predetermined load limit.

Abstract: An exhaust processor is provided for filtering particulate matter from a combustion product. The exhaust processor includes a partition situated inside a housing to form a filtering region and a bypass region in an upstream portion of the housing. A substrate is mounted in the filtering region for solid particle filtration. A muffler is situated in a downstream portion of the housing spaced apart from the partition so that the entire spacial volume of the muffler can be utilized by combustion product passing through either the filtering region or the bypass region.