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Showing papers on "Secondary air injection published in 2003"


Patent
10 Jan 2003
TL;DR: In this paper, a method and apparatus for increasing combustion efficiency in internal combustion engines and external combustors resulting in increased fuel economy and reduced exhaust pollutants is disclosed, and the same principles and apparatus of the invention are used in the exhaust stream to further reduce pollutants.
Abstract: A method and apparatus is disclosed for increasing combustion efficiency in internal combustion engines and external combustors resulting in increased fuel economy and reduced exhaust pollutants. The same principles and apparatus of the invention are used in the exhaust stream to further reduce pollutants.

136 citations


Journal ArticleDOI
TL;DR: In this article, micro-flow control actuation embedded in a stator vane was used to successfully control separation and improve near stall performance in a multistage compressor rig at NASA Glenn.
Abstract: Micro-flow control actuation embedded in a stator vane was used to successfully control separation and improve near stall performance in a multistage compressor rig at NASA Glenn. Using specially designed stator vanes configured with internal actuation to deliver pulsating air through slots along the suction surface, a research study was performed to identify performance benefits using this microflow control approach. Pressure profiles and unsteady pressure measurements along the blade surface and at the shroud provided a dynamic look at the compressor during microflow air injection. These pressure measurements lead to a tracking algorithm to identify the onset of separation. The testing included steady air injection at various slot locations along the vane. The research also examined the benefit of pulsed injection and actively controlled air injection along the stator vane. Two types of actuation schemes were studied, including an embedded actuator for on-blade control. Successful application of an online detection and flow control scheme will be discussed. Testing showed dramatic performance benefit for flow reattachment and subsequent improvement in diffusion through the use of pulsed controlled injection. The paper will discuss the experimental setup, the blade configurations, and preliminary CFD results which guided the slot location along the blade. The paper will also show the pressure profiles and unsteady pressure measurements used to track flow control enhancement, and will conclude with the tracking algorithm for adjusting the control.

127 citations


Patent
04 Jun 2003
TL;DR: A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and bypassing cathode air heat exchangers, combustion air for a combustor of tail gas from the anodes; cooling air for electronic controls; and reforming air to a liquid fuel vaporizer integral with a hydrocarbon fuel reformer as discussed by the authors.
Abstract: A solid-oxide fuel cell system having an integrated air supply system, including a central air pump, distribution manifold, air control valves, mass air flow sensors, and supply ducts, for controllably supplying oxygen for the fuel cell reaction, both through and controllably bypassing cathode air heat exchangers; combustion air for a combustor of tail gas from the anodes; cooling air for electronic controls; and reforming air to a liquid fuel vaporizer integral with a hydrocarbon fuel reformer.

95 citations


Patent
Steven Don Arnold1
21 Aug 2003
TL;DR: In this paper, a dual-loop EGR system with a high-pressure EGR loop and a low-pressure loop is presented, where exhaust, in proportions controlled by a control valve, enters a compressor from a point downstream of an exhaust emissions controller, together with fresh air.
Abstract: An internal combustion engine system, dual loop EGR system and method is provided, with a high pressure EGR loop, controlled by a control valve, in fluidic connection with the exhaust outlet of the exhaust manifold and the air inlet of the intake manifold, and a low pressure EGR loop, wherein exhaust, in proportions controlled by a control valve, enters a compressor from a point downstream of an exhaust emissions controller, together with fresh air, the low pressure EGR loop being in fluidic connection with an output of the compressor and the air inlet of the intake manifold.

86 citations


Patent
20 Nov 2003
TL;DR: In this article, a reagent injection strategy is developed and installed at the reagent injector to inject reagent into the exhaust system based on control signals from the re-agent injection controller in order to reduce NOx emissions at various operating conditions.
Abstract: The present invention provides for the retrofitting diesel truck engines with a system to reduce NOx emissions. The SCR system of the present invention, including a controller, a reagent tank, and an injection system, is installed on a vehicle. A NOx detector is temporarily installed as part of the system. The vehicle is then operated to collect engine parameters including fuel injection timing, RPM, load, exhaust heat, exhaust flow rate, and the like, together with measurements of the NOx emissions under various operating conditions. Based on the recorded data at various operating conditions, a reagent injection strategy is developed and installed at the reagent injection controller. During vehicle operation, the injector injects reagent into the exhaust system based on control signals from the reagent injection controller in accordance with the injection strategy in order to reduce NOx emissions at the various operating conditions.

82 citations


Patent
05 Jun 2003
TL;DR: In this paper, a set of flat planar vanes are mounted within a housing, with curved trailing edges to minimize impediment to fluid flow passing through the housing and provided with angled trailing end portions to enhance effectiveness of the vanes in imparting a swirling motion to the fluid flow.
Abstract: The device is utilized to provide swirling of either intake air flow or exhaust gas flow of an internal combustion engine. When used to swirl intake fluid flow, the device is positioned in the intake passageway for air entering the carburetor or fuel injection subsystem. The swirling of the air provides more complete mixing of the air and fuel entering the combustion chamber of the engine thereby providing more complete combustion of the fuel mixture. When utilized to swirl exhaust fluid flow, the device is positioned in the exhaust passageway for exhaust gases exiting the exhaust manifold. The swirling of the exhaust gases minimizes slowing of exhaust gas flow through the exhaust system to reduce back pressure and thereby provide more complete combustion. The device includes a set of flat planar vanes which are mounted within a housing. The vanes are angled to impart a swirling motion to the intake air or exhaust gas passing through the housing. The vanes are also provided with curved trailing edges to minimize impediment to fluid flow passing through the housing and provided with angled trailing end portions to enhance effectiveness of the vanes in imparting a swirling motion to the fluid flow.

79 citations



Patent
24 Jul 2003
TL;DR: Exhaust after-treatment system for the reduction of particulate, NOx, HC, CO, VOCs, nano-particle count and sulfur dioxide from diesel exhaust as mentioned in this paper.
Abstract: Exhaust after-treatment system for the reduction of particulate, NOx, HC, CO, VOCs, nano-particle count and sulfur dioxide from diesel exhaust. System employs diesel oxidation catalyst (10), exhaust cooling system (70, 80), particulate converter, soot collection chamber, soot processing drum, EGR and water scrubber.

70 citations


Journal ArticleDOI
TL;DR: Variations in permeability and capillary pressure at the site were sufficient to cause the injected air to spread laterally, forming stratigraphically trapped air pockets beneath the low permeability horizons, and resulted in a buildup of capillarypressure that exceeded the air entry pressure and allowed some air to migrate up through the lower permeability layers.

69 citations


Patent
05 Nov 2003
TL;DR: In this paper, an emissions control system is used with a compression ignition engine capable of producing an exhaust gas stream to be treated by a reduction agent which is mixed with the exhaust gasses to convert the exhaust gases stream prior to being directed into an SCR catalyst capable of reducing NOx in the exhaust gas streams.
Abstract: An emissions control system is used with a compression ignition engine capable of producing an exhaust gas stream to be treated by a reduction agent which is mixed with the exhaust gas stream to convert the exhaust gas stream prior to being directed into an SCR catalyst capable of reducing NOx in the exhaust gas stream. An exhaust gas recirculation valve is associated with the compression ignition engine for directing the exhaust gas stream back into the compression ignition engine. An electronic control unit and sensors determine whether the temperature of the exhaust gas stream is at a predetermined temperature, and if so control operation of the valve to allow a portion of the exhaust gas stream to be directed into the SCR catalyst. A bypass valve may also be provided to prevent the exhaust gas stream from entering into the SCR catalyst.

67 citations


Patent
06 Nov 2003
TL;DR: In this paper, the authors proposed a method for reducing the total emissions of a turbo-charged diesel engine having an engine crankcase and an exhaust tailpipe by filtering blow-by gases and directing filtered blowby gases back into the engine; and treating the exhaust stream with a catalyst.
Abstract: Methods, constructions, and systems for treating engine emissions. An engine includes a crankcase, an air intake, a blow-by vent, and an exhaust port; the crankcase emits blow-by gases through the blow-by vent, and the engine produces an exhaust stream through the exhaust port. The blow-by gases are directed through a blow-by filter to produce filtered gases. The filtered gases are directed back into the air intake of the engine; and the exhaust stream is treated with at least one of a catalytic converter, a flow through filter, and a diesel particulate filter. Total particulate matter (PM) emissions of a turbo-charged diesel engine having an engine crankcase and an exhaust tailpipe are reducible. The total emissions includes particulate matter matter emissions from the engine crankcase added to the particulate matter emissions from the exhaust tailpipe. The method includes filtering blow-by gases and directing filtered blow-by gases back into the engine; and treating the exhaust stream with a catalyst; whereby the total emissions are reduced by greater than 25% when compared to the same engine that does not filter blow-by gases nor treat the exhaust stream. Usable systems include: a blow-by filter in gas-flow communication with a blow-by vent of an engine crankcase; a diesel oxidation catalyst arrangement in gas-flow communication with an exhaust port of an engine crankcase, a diesel particulate filter (active or passive), a flow through filter, and combinations thereof.

Patent
21 Jul 2003
TL;DR: In this article, an estimation of the exhaust gas recirculation amount based on the exhaust valve closure timing in-cylinder residual gas amount and the valve overlap period blow-back gas amount is presented.
Abstract: An internal exhaust gas recirculation amount estimation system calculates an in-cylinder temperature at an exhaust valve closure timing, an in-cylinder pressure at the exhaust valve closure timing, and a gas constant corresponding to a change in a composition of exhaust gas, based on an air-fuel mixture ratio. An exhaust valve closure timing in-cylinder residual gas amount is calculated based on at least the in-cylinder temperature, the in-cylinder pressure, and the gas constant. Also calculated is a valve overlap period blow-back gas amount, which is defined as a quantity of gas flow from one of intake and exhaust ports via a combustion chamber to the other port during a valve overlap period. An internal exhaust gas recirculation amount is calculated based on the exhaust valve closure timing in-cylinder residual gas amount and the valve overlap period blow-back gas amount.

Journal ArticleDOI
TL;DR: In this article, the effect of cooling the recirculated exhaust gases (EGR) of Diesel engines on the chemical composition of the exhaust gases and the reduction in the percentages of pollutant emissions was examined.

Patent
03 Feb 2003
TL;DR: An exhaust assembly for an appliance comprises a filter housing (60) for retaining a filter (70) and an exhaust duct (90) which receives airflow from the filter housing and vanes.
Abstract: An exhaust assembly for an appliance comprises a filter housing (60) for retaining a filter (70) and an exhaust duct (90) which receives airflow from the filter housing (60). Vanes (75) are positioned in the filter housing (60) for guiding airflow from the exhaust side of the filter (70) to the exhaust duct (90). The vanes (75) spread the airflow entering the exhaust duct (90) across the width thereof so as to reduce noise and to reduce the velocity of the exiting air. The exhaust duct (90) increases in cross-sectional area in the direction of flow through the exhaust duct (90) so as to further reduce the velocity of the exiting air.

Patent
04 Jun 2003
TL;DR: In this paper, an inner feedback control loop is used to control the engine fuel/air ratio with feedback provided by a first exhaust gas sensor and an outer feedback control control loop that modifies a reference fuel and air ratio provided to the inner feedback controller based on feedback signals provided by the second and third exhaust gas sensors.
Abstract: A system and method for controlling an internal combustion engine for low emissions include an inner feedback control loop to control the engine fuel/air ratio with feedback provided by a first exhaust gas sensor and an outer feedback control loop that modifies a reference fuel/air ratio provided to the inner feedback control loop based on feedback signals provided by a second exhaust gas sensor positioned downstream relative to a portion of the catalyst and a third exhaust gas sensor positioned downstream relative to the second exhaust gas sensor. Catalyst gains are determined by modeling the catalyst as an integrator with an unknown gain and estimating the catalyst gain based on the exhaust gas sensors with the gain used to monitor catalyst performance and/or modify the engine fuel/air ratio.

Patent
21 Nov 2003
TL;DR: In this paper, the primary combustion is staged and controlled for low NOx formation and prevention of formation of CO, hydrocarbons, and VOCs, at low substoichiometric air percentages of 10-30 percent and at temperatures below 1000 degrees F.
Abstract: Pyrolyzing gasification system and method of use including primary combustion of non-uniform solid fuels such as biomass and solid wastes within a refractory lined gasifier, secondary combustion of primary combustion gas within a staged, cyclonic, refractory lined oxidizer, and heat energy recovery from the oxidized flue gas within an indirect air-to-air all-ceramic heat exchanger or external combustion engine. Primary combustion occurs at low substoichiometric air percentages of 10-30 percent and at temperatures below 1000 degrees F. Secondary combustion is staged and controlled for low NOx formation and prevention of formation of CO, hydrocarbons, and VOCs. The gasifier includes a furnace bed segmented into individual cells, each cell is independently monitored using a ramp temperature probe, and provided with controlled air injection. Gasifier air injection includes tuyere arrays, lances, or both. The oxidizer includes three serially aligned stages separated by air injecting baffles, and ability to adjust the exit air temperature.

Patent
11 Jul 2003
TL;DR: In this article, an accumulator and an intensifier are combined in a fuel injector to achieve high degree of freedom in the execution of an arbitrary fuel injection pattern, where the after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed.
Abstract: To obtain a fuel injection method in a fuel injector capable of realizing excellent combustible and exhaustive characteristics, and carrying out fuel injection with an arbitrary fuel injection pattern thus allowing a degree of freedom of a fuel injection pattern to further expand. In an fuel injector comprising an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase of an injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed. Namely, a pressure during a movement from a base common rail pressure of the accumulator to a static maximum pressure statically determined by an operation of the intensifier is positively used as a control factor of injection, whereby a fuel injection pattern can be implemented with an extremely high degree of freedom.

Patent
21 Jul 2003
TL;DR: An exhaust system for an internal combustion engine having a plurality of cylinders, comprising: a exhaust manifold for providing fluid communication of exhaust of the plurality-of-cylinders to a catalytic converter, the exhaust manifold comprising a first exhaust pipe and a second exhaust pipe, the first and second exhaust pipes being in fluid communication with the second and third, respectively, is described in this paper.
Abstract: An exhaust system for an internal combustion engine having a plurality of cylinders, comprising: a exhaust manifold for providing fluid communication of exhaust of the plurality of cylinders to a catalytic converter, the exhaust manifold comprising a first exhaust pipe and a second exhaust pipe, the first exhaust pipe being in fluid communication with the second exhaust pipe and the second exhaust pipe being in fluid communication with the catalytic converter, the first exhaust pipe providing a first fluid path for exhaust of a first plurality of cylinders of the engine and the second exhaust pipe providing a second fluid path for exhaust of a second plurality of cylinders of the engine, the second fluid path being shorter than the first fluid path; a controller for determining whether to deactivate the first plurality of cylinders in accordance with a predetermined engine starting condition, wherein deactivation of the first plurality of cylinders causes the second plurality of cylinders to operate at a condition corresponding to an engine output demand, wherein an exhaust of a first temperature is expelled by the second plurality of cylinders into the catalytic converter, the first temperature being greater than an exhaust temperature that would be generated by the first and the second plurality of cylinders operating at the condition corresponding to the engine output demand.

Patent
Junichiro Hara1
18 Nov 2003
TL;DR: An exhaust-heat recovery system as discussed by the authors consists of a catalytic converter, an exhaust heat exchanger, an air conditioner and an engine controller, such that exhaust discharged from an engine passes therethrough and combustible components in the exhaust are catalytically burned therein.
Abstract: An exhaust-heat recovery system includes a catalytic converter, an exhaust heat exchanger, an air conditioner and an engine controller. The catalytic converter is such that exhaust discharged from an engine passes therethrough and combustible components in the exhaust are catalytically burned therein. The exhaust heat exchanger induces heat exchange between the exhaust having passed through the catalytic converter and a coolant having passed through the engine. The air conditioner generates a heating wind by means of the heat exchange between the coolant having passed through the exhaust heat exchanger and an air conditioning wind. The engine controller controls incrementally the combustible components in the exhaust to be burned in the catalytic converter when a prescribed heating condition is unsatisfied.

Patent
02 Oct 2003
TL;DR: In this paper, an exhaust gas particle filter (3) is embodied in the form of a porous, cylindrical filter body with a substantially radial exhaust gas in-streaming direction in the filter body.
Abstract: The invention relates to an exhaust gas aftertreatment system, especially for a diesel engine. The exhaust gas aftertreatment system comprises an exhaust gas particle filter (3), a nitrogen oxide reduction catalyst (7, 8) connected downstream of the exhaust gas particle filter and a reducing agent feeding device (17). According to the invention, the exhaust gas particle filter (3) is embodied in the form of a porous, cylindrical filter body with a substantially radial exhaust gas in-streaming direction in the filter body, a filter groove area (26) for filtered exhaust gas and an axial exhaust gas out-streaming direction discharging from the filter groove area. Reducing agent is fed into the filter groove area (26) by means of the reducing agent feeding device (17). The invention can be used in motor vehicles, more particularly commercial vehicles.

Patent
20 Nov 2003
TL;DR: In this paper, a method for determining a target exhaust temperature for a gas turbine is proposed, which is based on a compressor pressure condition and a temperature adjustment to the exhaust temperature based on at least one parameter of a group of parameters.
Abstract: A method for determining a target exhaust temperature for a gas turbine including: determining a target exhaust temperature based on a compressor pressure condition; determining a temperature adjustment to the target exhaust temperature based on at least one parameter of a group of parameters consisting of specific humidity, compressor inlet pressure loss and turbine exhaust back pressure; and adjusting the target exhaust temperature by applying the temperature adjustment.

Patent
05 Mar 2003
TL;DR: In this paper, an openable intake throttle valve and an intake and exhaust bypass circuit are adjusted to set the pressure at the exhaust gas circulation position of the intake circuit to be lower than that in an exhaust manifold.
Abstract: In an internal combustion engine having an exhaust gas recirculation circuit, the efficiency of a turbocharger is raised in a wide engine rotational speed area and, even when a pressure in an intake circuit is higher than that in an exhaust circuit, an exhaust gas can be circulated. For this purpose, an openable intake throttle valve ( 12 e ) is provided on the more upstream side than an exhaust gas circulation position of the intake circuit ( 12 ), or a narrow portion ( 12 b ) is formed on the exhaust gas circulation position of the intake circuit and an intake bypass circuit ( 12 c ) for bypassing the narrow portion is provided. Further, an intake and exhaust bypass circuit ( 20 ) for connecting the intake circuit to the exhaust circuit ( 16 ) is provided. Then, the opening degree of the intake throttle valve or intake bypass circuit and the opening degree of the intake and exhaust bypass circuit are adjusted so as to set the pressure at the exhaust gas circulation position of the intake circuit to be lower than that in an exhaust manifold ( 16 a ).

Patent
Hiroyuki Nishimura1, Eriko Yashiki1
09 Jul 2003
TL;DR: In this paper, an exhaust particulate trapping means 12 for trapping particulates in exhaust gases is provided in an exhaust path 3 of an engine, and the cooling action of the exhaust particle trap means 12 through heat exchange with the exhaust gases can be kept up to suppress that the temperature of exhaust particle trapping mean 12 excessively rises on engine deceleration.
Abstract: An exhaust particulate trapping means 12 for trapping particulates in exhaust gases is provided in an exhaust path 3 of an engine. When the engine enters a deceleration condition during the removal by burning of exhaust particulates trapped by the exhaust particulate trapping means 12, the drop of the flow rate of exhaust gases flowing into the exhaust particulate trapping means 12 is restricted. Thus, the cooling action of the exhaust particulate trapping means 12 through heat exchange with the exhaust gases can be kept up to suppress that the temperature of the exhaust particulate trapping means 12 excessively rises on engine deceleration.

Patent
26 Feb 2003
TL;DR: In this article, a turbo-charged internal combustion cylinder assembly includes a combustion chamber which may be communicably connected to a compressor via an intake port through an intake manifold and aftercooler so the compressor may provide pre-combustion gases to the combustion chamber when the intake valve is open.
Abstract: A turbo-charged internal combustion cylinder assembly includes a combustion chamber which may be communicably connected to a compressor via an intake port through an intake manifold and aftercooler so the compressor may provide pre-combustion gases to the combustion chamber when the intake valve is open. An exhaust port communicably connects the combustion chamber to an exhaust manifold. An exhaust valve may open to exhaust post-combustion gases to the exhaust manifold while an intake valve is substantially closed, and the exhaust valve may open to admit post-combustion gases to the combustion chamber while the intake valve is substantially open and an exhaust port pressure in the exhaust port is higher than a combustion chamber pressure in the combustion chamber. A fuel injector may admit fuel to the combustion chamber. A spill valve may control a rate of fuel injection to the combustion chamber, the spill valve having a first position providing a maximum fuel injection rate, a second position providing a substantially zero fuel injection rate, and at least one intermediate position providing an intermediate fuel injection rate between the maximum fuel injection rate and the zero fuel injection rate.

Patent
24 Dec 2003
TL;DR: In this paper, an engine with high (HDL) and low (NDL) pressure turbochargers whose turbines are connected via an exhaust gas channel and their compressors via a charging air channel is implemented as a rotary valve.
Abstract: The engine (1) has high (HDL) and a low (NDL) pressure turbochargers whose turbines (2,4) are connected via an exhaust gas channel and their compressors via a charging air channel, an exhaust gas feedback device and an engine braking device. A control element for the exhaust gas feedback device, an engine braking shut-off element and a control element for varying the exhaust gas applied to the turbines are implemented as a rotary valve (10).

Patent
16 Oct 2003
TL;DR: In this paper, an exhaust gas recirculating system for a turbocharged diesel engine utilizes an electrically driven compression pump to boost exhaust gas pressure before return to the engine induction system.
Abstract: An exhaust gas recirculating system for a turbocharged diesel engine utilizes an electrically driven compression pump to boost exhaust gas pressure before return to the engine induction system. Exhaust gas is drawn from the exhaust system or stack some distance removed and downstream from the outlet from the exhaust turbine, compressed to overcome the intake manifold boost pressure, and returned to the intake system along an extended pipe to cool the gas. The compressor is energized from the vehicle battery during periods of demand for peak pressure demand on the engine thereby recycling recaptured energy from the battery to boost engine output. Exhaust turbine performance during periods of peak loading is also improved.

Patent
03 Sep 2003
TL;DR: In this paper, an air fuel ratio controller for an internal combustion engine consisting of an exhaust gas sensor, an identifier and a control unit is configured to use the model parameters to control the air-fuel ratio so that the output of the sensor converges to a desired value.
Abstract: An air fuel ratio controller for an internal combustion engine comprises an exhaust gas sensor, an identifier and a control unit. The exhaust gas sensor detects oxygen concentration of exhaust gas. The identifier calculates model parameters for a model of a controlled object based on the output of the exhaust gas sensor. The controlled object includes an exhaust system of the engine. The control unit is configured to use the model parameters to control the air-fuel ratio so that the output of the exhaust gas sensor converges to a desired value, and to stop the identifier from calculating the model parameters during and immediately after the engine operation with a lean air-fuel ratio. The calculation of the model parameters may be also stopped during and immediately after fuel-cut operation that stops fuel supply to the engine. Such a stop of the calculation of the model parameters reduces the emission of undesired substances contained in exhaust gas when the engine shifts from lean operation to stoichiometric/rich operation.

Patent
Toshio Hasegawa1
02 Dec 2003
TL;DR: In this article, an exhaust apparatus for a process apparatus which processes an object using a process gas includes an exhaust pipe to be connected to an exhaust port of the process apparatus, and a trap mechanism connected to the exhaust pipe, for removing an impurity gas contained in an exhaust gas from the process.
Abstract: An exhaust apparatus for a process apparatus which processes an object using a process gas includes an exhaust pipe to be connected to an exhaust port of the process apparatus, and a trap mechanism connected to the exhaust pipe, for removing an impurity gas contained in an exhaust gas from the process apparatus. A reaction-gas supply mechanism is provided in the exhaust pipe at an upstream of the trap mechanism, for feeding a reaction gas which is reacted with the impurity gas in to exhaust pipe to lower a vapor pressure of the impurity gas.

Patent
30 Apr 2003
TL;DR: In this article, a controller effects the deactivation and reactivation of cylinders and/or decrease and increase of exhaust gas flow in response to one or more sensors providing input of the exhaust gas temperature.
Abstract: Exhaust gas temperature is increased to improve the effectiveness of an after-treatment system having an activation temperature by deactivating one or more engine cylinders to increase the exhaust gas temperature from the remaining cylinders (during acceleration) or to decreasing exhaust gas flow rate (during deceleration or idling). In the system of the invention, a controller effects the deactivation and reactivation of cylinders and/or decrease and increase of exhaust gas flow in response to one or more sensors providing input of exhaust gas temperature or information from which exhaust gas temperature can be approximated. By achieving and maintaining the activation temperature, the present invention improves the effectiveness of after-treatment devices thereby lowering regulated emissions to desired levels.

Patent
03 Jun 2003
TL;DR: In this article, an exhaust gas collecting apparatus of an internal combustion engine comprises a collection vessel that can hold exhaust gas, an exhaust passage through which the exhaust gas is introduced from an exhaust vessel to the exhaust passage at a position upstream from the catalytic converter, and an open/close valve that is switchable between a position where the introduction of the exhaust gases through the introduction passage is permitted and a position that the introduction is prevented.
Abstract: To restrict the discharging of harmful components immediately after the starting of an internal combustion engine, an exhaust gas collecting apparatus of an internal combustion engine comprises: a collection vessel that can hold exhaust gas; an exhaust gas taking-out passage through which exhaust gas is introduced from an exhaust passage to the collection vessel; an exhaust gas introduction passage through which the exhaust gas is introduced from the collection vessel to the exhaust passage at a position upstream from the catalytic converter; a switching valve that is switchable between a position where the introduction of the exhaust gas from the exhaust passage to the exhaust gas taking-out passage is permitted and a position where the introduction of the exhaust gas is prevented; and an open/close valve that is switchable between a position where the introduction of the exhaust gas through the exhaust gas introduction passage is permitted and a position where the introduction of the exhaust gas is prevented. The switching valve is controlled such that at least a part of the exhaust gas discharged from an internal combustion engine is collected into the collection vessel through the exhaust gas taking-out passage during a period from a starting time of the internal combustion engine to satisfaction of a predetermined collection terminating condition.