Abstract: An exhaust gas recirculation control system for internal combustion engines includes an intake pipe (1) for delivering combustion air to the individual combustion chambers, an exhaust pipe (2) for discharging the exhaust gases from the combustion chambers, an exhaust gas recirculation line (3) that connects the intake pipe (1) and the exhaust pipe (2), and a mechanical injection pump (4) which is controlled by a control rod (5) is disclosed. An electrically controlled EGR valve (exhaust gas recirculation valve) (6) is located in the exhaust gas recirculation line (3) in order to control the effective cross section of the exhaust gas recirculation line (3) while an electrical pick-off device (7) determines the position of the control rod (5) and then controls the EGR valve (6).

Abstract: A power system including an exhaust producing engine, an exhaust system and an exhaust gas recirculation (EGR) system is provided. The EGR system may include an EGR flowpath and an air intake system. The EGR system may also include an EGR valve configured to regulate the flow of exhaust gases through the EGR flowpath. The power system may also include a monitoring system configured to monitor operating parameters of at least two components of the EGR system. The power system may also include a controller configured to determine, based on the monitored operating parameters, a maximum flowrate value for each of the components. Each of the maximum flowrate values may represent the maximum EGR flowrate for that component. The controller may be configured to control the EGR valve, based on the maximum flowrate values, to result in an EGR flowrate no greater than the lowest of the maximum flowrate values.

Abstract: An internal combustion engine (100) includes an intake manifold (106) and at least one exhaust manifold (108). A first compressor (120) that is operably associated with a first turbine (128) has a first air inlet (126) and a first air outlet (118). The first air inlet (126) is adapted to admit air into the first compressor (120), and the first air outlet (118) is fluidly connected to the intake manifold (106). The first turbine (128) fluidly communicates with a tailpipe (138). A second compressor (124) is operably associated with a second turbine (160) and has a first tributary fluid inlet (152), a second tributary fluid inlet (154), and a second fluid outlet (122). The first tributary fluid inlet (152) is fluidly connected to the tailpipe (138) at a junction (147), the second tributary fluid inlet (154) is adapted to admit air into the second compressor (124), and the second fluid outlet (122) is fluidly connected to the intake manifold (106).

Abstract: A cooler arrangement of a vehicle includes a charge air cooler which itself includes at least one pipeline for guiding compressed air during cooling and a first tank for receiving the cooled compressed air from the first pipeline, and an EGR cooler which includes at least one second pipeline for guiding exhaust gases during cooling, and a second tank operable to receive the cooled exhaust gases from the second pipeline. A mechanical connection connects an end of the first tank of the charge air cooler to an end of the second tank of the EGR cooler so that the tanks constitute a composite tank unit in a fitted state in the vehicle.

Abstract: An EGR mixer comprises an upstream conduit section having a contracting flow area in a direction of air flow through the mixer, a downstream conduit section having an expanding flow area in the direction of air flow through the mixer, a slot formed in the downstream conduit section for admitting exhaust to the air flow, and an abrupt flow-expanding ridge disposed between the upstream and downstream conduit sections. With the EGR mixer configured in this manner, recirculated exhaust may be effectively homogenized into an intake air flow with reduced drag.

Abstract: The invention relates to a method for operating an internal combustion engine, wherein exhaust gas produced by the internal combustion engine is returned to the internal combustion engine via an exhaust gas recirculation device, which comprises at least two cooling units with each of which a bypass is associated, the exhaust gas being cooled in the exhaust gas recirculation device as a function of the load state of the internal combustion engine, and wherein fresh air is fed to the internal combustion engine via a charge-air feed device, which comprises at least one cooling unit and at least one bypass connected in parallel to the cooling unit, the fresh air being supplied via the cooling unit and/or the bypass as a function of the load state. The invention also relates to an internal combustion engine comprising an exhaust gas recirculation device and a charge-air feed device.

Abstract: A method to dislodge an adherent residue in an EGR cooler, the EGR cooler installed in an engine. The method comprises switchably flowing the exhaust gas through the exhaust-gas recirculation cooler according to a normal-calibration control mode when a temperature of the coolant is above a threshold temperature, and switchably flowing the exhaust gas through the exhaust-gas recirculation cooler according to an EGR-cooler restoring control mode (with a greater time-averaged flow of the exhaust gas) when the temperature of the coolant is below the threshold temperature.

Abstract: A locomotive two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system is described for reducing NOX emissions and achieving improved fuel economy by recirculating exhaust gas through the engine. This system generally includes a turbocharger adapted to draw and compress fresh air. An aftercooler is coupled to the turbocharger adapted to cool the compressed air. A two-stroke uniflow scavenged diesel engine having a power assembly provides combustion and produces exhaust therefrom. The engine has a positive pressure gradient between the power assembly intake ports and the exhaust manifold to maintain scavenging and mixing in the power assembly. An EGR system includes a flow regulating device and a cooler. The flow regulating device is adapted to direct a select portion of the exhaust gas to be recirculated and direct the majority portion of the exhaust gas to the turbocharger.

Abstract: A cooled exhaust gas recirculation system includes one or more cylinders, each with several valves, an intake manifold, an exhaust manifold and a cooled exhaust gas recirculation chamber. The cooled exhaust gas recirculation chamber removes a portion of the exhaust that exits the cylinders, cools the removed portion of the exhaust, and recirculates the cooled removed portion of the exhaust for reintroduction into the cylinders. The cooled recirculated exhaust is reintroduced directly to the cylinders using a dedicated valve controlled by an electronic control unit.

Abstract: An engine (10, 100, 200, 34) assembly comprising an engine (36), at least one exhaust gas recirculation valve, (54) at least one throttle valve, and an actuator (12,112,212) operably connected to the EGR valve (56) and the throttle valve (54). The actuator (12, 112, 212) can be operably connected to any predetermined combination of a predetermined number of EGR valves (56) and a predetermined number of throttle valves (54). The actuator (12, 112, 212) can be a mechanical actuator, a pneumatic actuator, a hydraulic actuator, or an electrical actuator.

Abstract: Various systems and method for heating an engine in a vehicle during a cold start are described. In one example, thermal efficiency of the engine is improved by heating engine coolant via a high-pressure exhaust gas recirculation (HP-EGR) system. For example, after light-off of an exhaust catalyst, exhaust gas is routed through the HP-EGR system which includes a HP-EGR cooler. Heat from the exhaust gas is then used to warm the engine coolant via the HP-EGR cooler. One or more engine operating parameters are adjusted in response to the HP-EGR entering the engine during the cold start in order to maintain combustion stability.

Abstract: A system is provided for enhancing aftertreatment regeneration capability. The system includes an internal combustion engine producing an exhaust gas stream and an aftertreatment component that treats the exhaust gas stream, where the aftertreatment component includes a desired inlet exhaust gas temperature. The system includes an exhaust gas pressure device that modulates an exhaust pressure value, and a fuel injection system that provides a post-injection event. The system includes a controller that provides an exhaust pressure command and a fuel injection command in response to determining that a temperature of the exhaust gas stream is lower than the desired inlet exhaust gas temperature. The exhaust gas pressure device is responsive to the exhaust pressure command and the fuel injection system is responsive to the fuel injection command.

Abstract: An exhaust gas recirculation apparatus includes a housing connected with an EGR cooler via a mount face. The housing has a valve chamber accommodating a selector valve. The housing has a partition extending from the mount face close to the valve chamber to divide first and second exhaust ports opened in the mount face. A first passage leads exhaust gas into the EGR cooler through the valve chamber. A second passage recirculates exhaust gas to the intake passage through the EGR cooler and the valve chamber. A bypass passage leads exhaust gas from the engine through the valve chamber to bypass the EGR cooler. A rotation axis of the selector valve is perpendicular to an axis of the mount face, and offset away from the partition.

Abstract: A system for reducing the temperature of waste heat from a waste heat source of a vehicle engine, including an open loop Brayton cycle having a cooler, a compressor, a turbine, and a shaft coupling the compressor to the turbine. Waste heat and compressed air from the compressor flow through the cooler, thereby transferring heat from the waste heat to the compressed air and lowering the temperature of the waste heat. The heated and compressed air is expanded across the turbine, to cause rotation of the shaft, thereby powering rotation of the compressor. Excess power beyond that necessary to drive the compressor may be drawn off through a generator which has its rotor mounted on the same shaft as the compressor and turbine.

Abstract: A method for providing intake air to an engine in a vehicle comprises delivering compressed fresh air and EGR to the engine via first and second throttle valves coupled to an intake manifold of the engine. During a higher engine-load condition, an EGR exhaust flow is cooled in a heat exchanger and the cooled EGR exhaust flow is admitting to the intake manifold. During a lower engine-load condition, fresh air is warmed in the heat exchanger, and the warmed fresh air is admitted to the intake manifold.

Abstract: A method for dislodging exhaust gas deposits from an exhaust gas recirculation (EGR) cooler (26) associated with an engine includes the steps of providing at least one on-board gas source (S) for providing a gas (G) at a superatmospheric pressure, and placing the EGR cooler in fluid communication with the gas source through a supply conduit (44, 144). The supply conduit (44, 144) includes at least one valve (V) that is selectively operable to a closed condition closing the supply conduit and to an open position opening the supply conduit. The method also includes the step of operating the at least one valve (V) from the closed condition to the open condition to allow the superatmospheric gas (G) to flow through the supply conduit (44, 144) to the EGR cooler (26).

Abstract: Methods and systems are provided for operating a turbocharged engine including a particulate filter positioned upstream of a turbocharger turbine, a catalyst positioned downstream of the turbine, and an EGR passage coupled between an engine exhaust and engine intake. In one example, the method comprises, diverting exhaust gas from downstream of the filter to the engine intake via the EGR passage, and adjusting an amount of diverted exhaust gas based on filter operating conditions.

Abstract: An engine system comprises an air cleaner, a combustion chamber coupled to an intake port, and an intake manifold. The intake manifold is configured to receive air from the air cleaner, and, under some conditions to receive exhaust from the combustion chamber. The engine system further comprises a multifunction, barrel-type throttle valve coupled to the intake port via an outlet, the throttle valve having a first inlet coupled to the intake manifold and a second inlet coupled to the air cleaner.

Abstract: An internal-combustion engine receives no air from outside atmosphere. Instead, combustion gas expelled from the engine is cooled and recycled back into the engine. That gas contains no nitrogen and consists mostly of carbon dioxide and water vapor. Oxygen and fuel are added to the recycled gas, and the resulting mixture is used to perform an internal-combustion cycle. A small amount of the expelled combustion gas is discharged into outside environment, and the rest is recycled. Since no nitrogen is present, no nitrogen oxides are produced. The amount of other harmful exhaust emissions, including particulate matter, is greatly reduced too, since most of them are recycled back into the engine. The engine is inherently supercharged with combustion-gas pressure and, since the combustion gas is heavier than air, the engine can be substantially smaller than a conventional engine of equal power. Direct injection of oxygen leads to further reduction in engine size. A smaller engine has much better fuel economy.

Abstract: A coolant circulation system for an internal combustion engine includes an exhaust gas recirculation system coolant circuit and a cabin heating circuit. The exhaust gas recirculation system coolant circuit includes a heat exchanger to extract heat from exhaust gases into the engine coolant. The cabin heating circuit includes a heat exchanger for sinking heat into a vehicle cabin. An exhaust gas recirculation flow control valve controls the flow of exhaust gas flowing through the exhaust gas recirculation line and through the line heat exchanger. The exhaust gas recirculation flow control valve is closed when the engine is not warm enough. A heater control valve controls the flow of coolant through the cabin heating circuit. Opening and closing of the heater control valve is made responsive to direct or indirect indication of engine temperature in order to maintain engine temperature by restricting flow to the cabin heating circuit.

Abstract: A device for distributing recirculated gases to a component of an exhaust gas recirculation system. The device includes an inlet and an outlet for recirculated gases, an inlet port and an outlet port to the component, and a mechanism to reverse the stream of recirculated gases flowing through the component. A device for cooling recirculated exhaust gases is equipped with a mechanism to reverse the stream of recirculated gases inside the exchanger. A method of recirculating exhaust gases includes cleaning the EGR system, which is triggered by an electronic unit, and which includes reversing the stream of EGR gases flowing through an EGR cooling device.

Abstract: An EGR system for an engine that includes an exhaust gas recirculation conduit in fluid communication with an exhaust line and an intake port is provided. A cooler is fluidly positioned along the exhaust gas recirculation conduit and in fluid communication with the exhaust line and the intake port. A valve is fluidly positioned along the exhaust gas recirculation conduit and in fluid communication with the exhaust line and the intake port. The valve includes an electronic solenoid controlled hydraulic actuator operable to control the valve, and the actuator includes a position feedback sensor to detect a position of the valve.

Abstract: A method is provided for controlling the level of oxygen concentration in the intake manifold of an internal combustion engine system. The engine having an intake manifold and an exhaust manifold and corresponding intake and exhaust lines, the intake line having a leading point for mixing of fresh air, first and second EGR routes, a charge air cooler located in the intake line upstream the intake manifold and downstream the second EGR route, a turbocharger having a compressor located in the intake line and a turbine located in the exhaust line, the exhaust line having a diesel oxidation catalyst and an antiparticulate filter. The system has a regulator for regulating the flow rate of exhaust gas. The regulator including, but not limited to a low pressure EGR valve associated to the second EGR route.

Abstract: A self-cooling exhaust gas injection device making it possible to inject heated gases, for example recycled exhaust gases from an internal combustion engine, into the air intake distributor of this engine, characterized in that it comprises a return pipe for the exhaust gases (1) which extends in the distributor (2) to the downstream end thereof in the direction of the transfer of the recycled gasses and is equipped in this area with a series of outlet orifices (4) positioned so as to uniformly distribute these gases between each of the cylinders of the engine.

Abstract: A device is provided for compressor and charge air cooler protection in an internal combustion engine, such as a Diesel engine. The engine having an intake manifold and an exhaust manifold, first and second EGR routes, a charge air cooler, a turbocharger having a compressor and a turbine. A regulator is also provided for regulating the flow rate of exhaust gas and the splitting of exhaust gas between the first and second EGR route. A temperature sensor is also provided for sensing output temperature of gas at the outlet of said compressor. A method and computer readable medium embodying a computer program product are also provided that have a first phase of monitoring a parameter representative of the gas temperature at the output of the compressor and a second phase in which an activity involving engine components operation is performed. The activity is performed using temperature information determined in the monitoring phase.

Abstract: The invention relates to a heat exchanger with at least one duct, which can be flowed through by flowing medium from an inlet cross-section to an outlet cross-section, has an inside and outside, and which comprises, on the inside, structural elements for increasing the transfer of heat. The invention provides that the structural elements (11) are variably arranged and/or configured in the direction of flow (P) so that the duct (10), on the inside, has a variable heat transfer that, in particular, increases in the direction of flow (P).

Abstract: In an internal combustion engine with at least one turbocharger supplying compressed air to the engine cylinders which are divided into a first group and a second group, a first exhaust gas line connecting a first section of an exhaust gas collection line to the turbine, a recirculation line for returning exhaust gas from a second section of the exhaust gas collection line to the charge air supply line, a first control device controls the exhaust gas flow from a section of the cylinders to the first section of the exhaust gas collection line, a second control device controls the exhaust gas flow to the turbine and a third control device controls the exhaust gas flow recirculated to the charge air supply line for the cylinder.

Abstract: An outboard motor is provided with an exhaust gas recirculation (EGR) system that provides a heat exchanger which reduces the temperature of the exhaust gas prior to introducing the exhaust gas to the cylinders of the engine. The heat exchanger can be integral to the engine, particularly the cylinder head of the engine, or it can be disposed outside the structure of the engine. When disposed outside the structure of the engine, the heat exchanger can comprise a tubular structure that causes exhaust gas and water, from the body of water, to flow in thermal communication with each other. Alternatively, the heat exchanger which is disposed outside the structure of the engine can use a cavity within the driveshaft housing as a heat exchanger with water being sprayed into the stream of exhaust gas as it passes from the engine to the cavity.

Abstract: A cooling system is provided for an internal combustion engine that includes, but is not limited to an engine coolant circuit having a coolant inlet and a coolant outlet, a radiator having an inlet and an outlet, a first pipeline for hydraulically connecting the radiator outlet and the engine coolant inlet, a second pipeline for hydraulically connecting the engine coolant outlet to the radiator inlet, a coolant pump located in the first pipeline for moving a coolant towards the engine coolant inlet, a thermostatic valve located in the first pipeline between the primary pump and the radiator outlet, for closing or at least partially opening the passageway, a bypass pipeline for hydraulically connecting an intermediate point of the second pipeline to an intermediate point of the first pipeline, the latter being located between the thermostatic valve and the radiator outlet, an exhaust gas recirculation cooler located in the bypass pipeline, an auxiliary coolant pump located in the bypass pipeline, and a control

Abstract: Unique to this invention is the design of an Exhaust Gas Recirculation (EGR) valve with bypass capabilities. EGR valves combined with a bypass valve are expensive to design and manufacture due to their complexity and unique differences. Furthermore, the reliability of multiple components is much lower than that of the single component. During various engine operating conditions it is necessary to divert the flow of exhaust gas around the EGR cooler through the intake manifold or through the EGR cooler to lower the temperature of the exhaust gas to reduce noxious emissions. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: A locomotive two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system and apparatus is described for reducing NOx emissions and achieving improved fuel economy by recirculating exhaust gas through the engine. This system generally includes a turbocharger adapted to draw and compress fresh air. An aftercooler is coupled to the turbocharger adapted to cool the compressed air. A two-stroke uniflow scavenged diesel engine having a power assembly provides combustion and produces exhaust therefrom. The engine has a positive pressure gradient between the power assembly intake ports and the exhaust manifold to maintain scavenging and mixing in the power assembly. An EGR system includes a flow regulating device and a cooler. The flow regulating device is adapted to direct a select portion of the exhaust gas to be recirculated and direct the majority portion of the exhaust gas to the turbocharger.

Abstract: In one approach, a method for measuring exhaust gas recirculation flow in an engine is provided. The method comprises separating EGR flow into at least a first flow and a second flow, passing the separated first flow through a restriction region, where the first flow passes through the restriction region separately from the separated second flow, combining the separated second flow and inducting the combined flows into a cylinder of the engine, where the EGR flow is separated and then combined within a common EGR passage.

Abstract: An exhaust gas recirculation system includes a butterfly valve in which the leak path through the valve is controlled by keeping the clearance between either a shaft of the valve and two bushings small or the clearance between the bushings and the counter bores in the valve element small, and making the other clearance larger.

Abstract: While an engine (10, 10A, 10B, 10C, 10D, 10E) is operating, a control system (22) processes data for certain engine operating parameters to calculate a quantity of exhaust gas needed to satisfy an exhaust gas recirculation requirement. If a primary EGR control loop (34) alone can satisfy the calculated quantity of exhaust gas, a secondary EGR control loop (36) is closed while the primary EGR control loop is controlled to satisfy the calculated quantity. When the processing determines that the primary EGR control loop alone cannot satisfy the calculated quantity, the secondary EGR control loop is open concurrently with the primary EGR control loop and both the primary EGR loop and the secondary EGR loop are controlled to cause the combined flow of exhaust gas through the primary EGR control loop and flow of exhaust gas through the secondary EGR control loop to satisfy the calculated quantity.

Abstract: A method of cooling recirculated exhaust gas from an exhaust manifold (27) of an engine (16) upstream of an intake manifold (29), the method including passing the recirculated exhaust gas from the exhaust manifold through a heat exchanger (36), and convectively forcing ambient air flow through the heat exchanger with at least one fan (58) attached to the heat exchanger. The method also includes the step of passing the cooled recirculated exhaust gas to the intake manifold (29).

Abstract: A method for controlling combustion in a combustion chamber of a turbocharged engine is described. The method includes admitting to the combustion chamber prior to ignition a first amount of exhaust from an intake manifold of the engine, the first amount changing at a first rate in response to a changing engine load. The method also includes retaining in the combustion chamber prior to the ignition a second amount of exhaust from the combustion chamber, the second amount changing at a second rate, greater than the first rate, in response to the changing engine load.

Abstract: Various systems and methods are described for operating an engine system having a sensor coupled to an exhaust gas recirculation system in a motor vehicle. One example method comprises during a first operating condition, directing at least some exhaust gas from an exhaust of the engine through the exhaust gas recirculation system and past the sensor to an intake of the engine and, during a second operating condition, directing at least some fresh air through the exhaust gas recirculation system and past the sensor.

Abstract: A valve (10) may be used with an internal combustion engine exhaust breathing system (12) and may include a body (60), a partition (62), and a plate (66). The body (60) may define a first port (70) that has a first interior surface (76), and may also define a second port (82) that has a second interior surface (84). The partition (62) may be located within the body (60), may at least partially separate the first port (70) and the second port (82) from each other, and may define an opening (104). The plate (66) may be dimensioned to seat and seal against the opening (104) and against the first and second interior surfaces (76, 84). The plate (66) may rotate, depending on predetermined factors, between a first position and a second position.

Abstract: An exhaust heat recirculation apparatus is capable of improving fuel mileage by heating lubricant using exhaust heat. The exhaust gas recirculation apparatus has a heat exchanger that is mounted at an exhaust line of an engine for heating coolant using the exhaust gas. The exhaust gas recirculation apparatus may include a main line allowing exhaust gas exhausted from each cylinder of the engine to communicate to a exhaust gas inlet, a bypass line communicated to a downstream side of the main line, a bypass valve mounted inside the bypass line, and a heat exchanger selectively communicated to the bypass line by way of the bypass valve.

Abstract: The present invention relates to a three-pass heat exchanger for an EGR system, comprising a casing housing at least one cooling chamber for gas circulating through a plurality of pipes and heads on its ends coupled to the gas inlet pipe coming from the exhaust manifold and to the gas outlet pipe connected to the intake manifold of the engine, which is configured as a three-pass heat exchanger, i.e. with three differentiated areas for gas circulation from the inlet pipe to the outlet pipe, the inlet pipe and the outlet pipe being located at opposite ends of the exchanger. The exchanger can include a bypass valve and two cooling chambers at different temperatures.

Abstract: An exhaust gas recirculation cooling system for an internal combustion engine that has an exhaust system is provided. The exhaust gas recirculation cooling system comprises a cooling fluid circuit, an exhaust gas recirculation cooler, a turbine, a condenser, and a compressor. The cooling fluid circuit has a quantity of fluid that circulates through the exhaust gas recirculation cooling system and receives heat from the exhaust gas recirculation cooling system. The exhaust gas recirculation cooler is disposed in fluid communication with the exhaust system to receive engine exhaust gas from the engine and to remove heat from the exhaust gas. The exhaust gas recirculation cooler additionally disposed in fluid communication with the cooling fluid circuit. The cooling fluid within the cooling fluid circuit receives heat within the exhaust gas recirculation cooler. The turbine is disposed in fluid communication with the cooling fluid circuit.

Abstract: An apparatus for a vehicle with an engine is provided that accomplishes exhaust heat recovery and exhaust gas recirculation with a common heat exchanger used for both purposes. The apparatus includes an exhaust system through which exhaust gas is discharged from the engine. A heat exchanger is positioned within the exhaust system. Coolant flow passages are provided in thermal communication with the engine and with the heat exchanger. A bypass valve is operable in a first position to direct the exhaust gas through the heat exchanger to transfer heat to the coolant flow passages in a coolant heating mode, and operable in a second position in which the exhaust gas bypasses the heat exchanger in a bypass mode during which no significant coolant heating occurs via the heat exchanger. A portion of the exhaust gas is recirculated to the engine after cooling via the heat exchanger.

Abstract: An arrangement for a supercharged combustion engine including a first compressor (6a) subjecting air to a first compression step, a second compressor (6b) subjecting the air to a second compression step, a first cooling system with a circulating coolant, a second cooling system with a circulating coolant which is at a lower temperature than the coolant in the first cooling system, a first charge air cooler (9a) applied to an air inlet line to the engine for cooling compressed air, the first cooler is located between the first compressor (6a) and the second compressor (6b) and is cooled by coolant from the second cooling system, a second charge air cooler (9b) applied to the air inlet line at a location downstream of the second compressor (6b) and is cooled by coolant from the first cooling system, and a third charge air cooler (9c) applied at a location downstream of the second charge air cooler (9b) and cooled by coolant from the second cooling system.

Abstract: A low pressure EGR system includes a low pressure EGR passage connecting a downstream portion of an exhaust gas cleaner disposed in an exhaust passage to an upstream portion of a supercharger compressor disposed in an intake passage. A device for trapping foreign particles contained in EGR gas to be recirculated is disposed in the low pressure EGR passage. The trapping device may be positioned lower than the passage connected thereto so that foreign particles drop into the device by their own weight. A cross-sectional area of the trapping device may be made larger than that of the passage so that the flow speed of the EGR gas is reduced in the trapping device and the foreign particles are easily trapped. A valve for closing the low pressure EGR passage may be disposed therein to stop EGR when malfunctions are detected in the exhaust gas cleaner or the supercharger.

Abstract: An exhaust gas recirculation cooler may include a housing and a first wall. The housing may include an exhaust gas region, a coolant region, an exhaust gas inlet, and an exhaust gas outlet. The first wall may be fixed within the housing and may separate the exhaust gas region from the coolant region. The first wall may include a first region facing the exhaust gas region and a first tab having a fixed end coupled to the first region and a free end generally opposite the fixed end. The free end may be displaceable between first and second positions based on an operating temperature of the exhaust gas. The free end may be displaced in a direction generally perpendicular to the first region when in the second position.

Abstract: A circuit for cooling exhaust gas being recirculated through an EGR system (36) of an engine (10) from an exhaust system (20) successively through first and second heat exchangers (38, 40) to an intake system (16) for entrainment with intake air. Each heat exchanger has a respective coolant inlet through which liquid coolant enters and a respective coolant outlet through which liquid coolant exits after having absorbed heat from recirculated exhaust gas. The circuit has a third heat exchanger (32) to which coolant coming from the outlet of one of the first and second heat exchangers rejects heat, and parallel branches (84, 86) through which coolant enters the inlet of the other of the first and second heat exchangers. One of the parallel branches has a fourth heat exchanger (34) to which coolant flowing through that branch rejects heat, and one or more devices (50, 50A) for controlling the quantity of coolant flowing through each branch.

Abstract: A method includes substantially reducing specific fuel consumption and exhaust emissions of an engine by adjusting an exhaust flow from a set of predetermined cylinders among a plurality of cylinders of the engine through an exhaust gas recirculation system to an intake manifold, by adjusting a temperature of a cooler of the exhaust gas recirculation system, and by adjusting a fuel injection timing, in response to variance in a plurality of parameters of the engine.

Abstract: A cooling water circulation system (100) is configured so that cooling water is delivered from a water pump (113) toward a cylinder head (111) via a pump delivery pipe (114). Further, the system (100) is configured so that an engine block cooling switching section (170) changes the supply of the cooling water from the cylinder head (111) to a cylinder block (112) in accordance with a cooling water temperature. An EGR cooler branch pipe (151), which branches off from the pump delivery pipe (114), is connected to an EGR cooler (150). The EGR cooler branch pipe (151) is provided with an EGR cooler cooling switching valve (153) that opens or closes in accordance with an operating state.

Abstract: An internal combustion engine exhaust gas system includes an EGR arrangement adapted to lead a first flow of exhaust gas, the EGR flow, from an outlet side of the engine to an inlet side of the engine, an exhaust gas conduit adapted to lead away a second flow of exhaust gas, the exhaust flow, from the outlet side of the engine, and an energy recovering unit, such as a turbo, associated with the exhaust gas conduit. The unit is adapted to recover exhaust gas energy from the exhaust flow. The system includes a heat exchanger adapted to allow heat exchange between at least a part of the EGR flow and at least a part of the exhaust flow, the heat exchanger being associated with the exhaust gas conduit at a position downstream the energy recovering unit.

Abstract: An EGR venturi for use in an EGR system of an IC engine includes a body defining a converging inlet section, a throat, and an interior liquid heat exchange chamber adjacent to the throat.