Abstract: An apparatus and method relating to a cooling hole of a component of a turbine engine. The cooling hole can extend from an inlet to an outlet to define a connecting passage. The cooling hole can contain a diffusing section. The diffusing section can be defined by an interior surface having variable geometries.

Abstract: Airfoils having a leading edge and a trailing edge, with a plurality of cavities therein including a leading edge hybrid cavity extending in a radial direction between a first end and a second end of the airfoil body along the leading edge. An airfoil side hybrid cavity is located toward the trailing edge relative to the leading edge hybrid cavity and positioned adjacent a side wall of the airfoil body. The airfoil side hybrid cavity extends in a radial direction between the first end and the second end and a divider rib extends radially between the first end and the second end along the side wall of the airfoil between the airfoil side hybrid cavity and the leading edge hybrid cavity. At least one first cross-over hole is formed within the divider rib to fluidly connect the airfoil side hybrid cavity to the leading edge hybrid cavity.

Abstract: A method for inspecting a rotor blade unit of a gas turbine, the rotor blade unit including a radially outwardly disposed outer shroud connected by a material-to-material bond to a radially inwardly adjoining rotor blade. The method includes: providing a rotor blade unit; processing the outer shroud at its axially forward or axially aft side, the side selected to be processed being the one that has a greater distance from the adjacent axial leading edge or axial trailing edge of the rotor blade, a contact surface being formed by processing the selected side; providing the rotor blade unit having the contact surface in a measuring device, in particular a measuring device for determining the torsion or twist of the rotor blade unit about an axis.

Abstract: A fixture for transferring turbine blades may include: a first body having an arcuate radially inward surface shaped to contact a rotor of a turbomachine, and a radially outward surface including a plurality of dovetail slots therein shaped to engage the dovetails of the plurality of turbine blades; and a first alignment aperture extending axially through the first body relative to a centerline axis, and positioned for alignment with a portion of the rotor wheel such that the plurality of dovetail slots of the first body are substantially axially aligned with the plurality of dovetail slots of the rotor wheel for at least partial transfer of the turbine blade thereto from the fixture, wherein the dovetails of the plurality of turbine blades are slidably removable from the plurality of dovetail slots of the first body for guided insertion into the plurality of dovetail slots of the rotor wheel.

Abstract: Described is a turbine arrangement of a gas turbine engine, the turbine comprising: a rotor comprising a disc which incorporates a plurality of circumferentially spaced turbine blades, each blade having an aerofoil extending for a platform and a root portion securing the blade to the disc, a lock plate located at an axial end of the root portion of the blade, the lock plate comprising: a plate body having an inward facing surface which is located adjacent the blade root and an outward facing surface, radially inner and outer edge portions, and first and second circumferential edges; a head located at the radially outer edge portion of the plate body; a foot portion located at the radially inner portion of the plate body; a projection extending from the outwardly facing surface away from the turbine blade root in use, the projection being located adjacent to the foot portion, wherein the foot portion and head portion are located within slots provided at least partially by the disc and turbine blade respectivel

Abstract: An annular turbine engine combustion chamber wall including air admission orifices to create zones of steep temperature gradient, and cooling orifices to enable the air flowing on the cold side to penetrate to the hot side in order to form a film of cooling air along the annular wall, the annular wall being further includes, in the zones of steep temperature gradient, multi-perforation holes having respective bends of an angle ? greater than 90°, the angle ? being measured between an inlet axis Ae and an outlet axis As of the multi-perforation hole, the outlet axis of the multi-perforation hole being inclined at an angle ?3 relative to the normal N to the annular wall through which the multi-perforation holes with bends are formed, in a “gyration” direction that is at most perpendicular to the axial flow direction D of the combustion gas.

Abstract: A turbocharger includes a turbine housing that defines a flow passage for a fluid. The turbine housing includes a turbine shroud member. The turbocharger also includes a turbine wheel supported for rotation within the turbine housing relative to the turbine shroud member. The turbine wheel is configured to rotate as the fluid flows through the flow passage. Moreover, the turbocharger includes a port extending through the turbine shroud member. The port is configured to receive a portion of the fluid flowing through the flow passage.

Abstract: An axial flow rotating machine has: a rotor with a plurality of rotor blades; a stator with a plurality of stator blades; an axial flow rotating portion defined by the rotor and the stator; and a diffuser connected to the axial flow rotating portion on a downstream side of the axial flow rotating portion. A final blade portion inner-circumferential inner wall, which is a portion of an inner-circumferential inner wall of the axial flow rotating portion, is defined such that a diameter thereof at a trailing edge position of a final blade is smaller than the diameter at a leading edge position of the final blade. In addition, a diameter of all or a portion of a diffuser inner-circumferential inner wall decreases in a direction of the downstream side in an axial direction.

Abstract: A method of testing the integrity of a fluid flow regulator system for a turbine engine, the system including a fluid-passing duct associated with a movable flap; an actuator having a movable drive element suitable for delivering a movement force between a first position corresponding to the closed position of the movable flap and a second position corresponding to the open position of the movable flap; a push-pull cable interconnecting the drive element and the movable flap; and return device exerting a return force for moving the flap; the method of testing the integrity of the system including in succession: a step of supplying power to the actuator in order to place the drive element in the second position; a step of interrupting the supply of power; and a step of measuring the position of the drive element.

Abstract: An assembly for gas turbine, includes a first part and a second part installed circumferentially around a longitudinal axis of the turbine, where the first part has a first side face adjacent to a second side face of the second part, and where a first aperture made in first side face is facing a second aperture made in second side face, a sealing plate fitted inside the first aperture and the second aperture, at least one longitudinal face of the sealing plate includes at least two projections made either side of a longitudinal central area of the sealing plate, wherein each projection is of a height chosen so as to reduce a clearance between the sealing plate and the first and second apertures.

Abstract: The invention relates to a turbine for a turbine engine, having a stator and a rotor comprising a rotor wheel having vanes the radially external periphery of which comprises at least one lip which radially extends outwards, with sealing means radially extending about the vanes and comprising a ring. The radially external end of the lip cooperates with said ring so as to form a seal of the labyrinth type.

Abstract: An apparatus for sealing a circumferential gap between a stationary component and a rotating member is disclosed. The rotating member is configured to rotate about a longitudinal axis and has a radially outer surface disposed at a first non-zero angle with respect to the longitudinal axis. The apparatus includes a stator disposed circumferentially about the longitudinal axis and a shoe configured for translation in a radial direction with respect to the stator. The shoe includes a circumferential surface and a plurality of protrusions extending radially inward from the circumferential surface toward the rotating member, each one of the plurality of protrusions having a length configured to maintain a clearance gap with respect to the rotating member.

Abstract: An air scal system for a rotor blade assembly of a gas turbine engine includes a substrate. An optional ceramic interlayer may be disposed on an optional bond coat deposited on the substrate. An erosion resistant thermal barrier coating (E-TBC) layer is disposed on the ceramic interlayer (if present) or on the bond coat, or on the substrate. An abradable layer is disposed on the erosion resistant thermal barrier coating (E-TBC) layer.

Abstract: A hybrid energy storage and control system for a clearance control system for a gas turbine engine may comprise a hybrid electric power source, a first converter, a second converter configured to receive electric power from the hybrid electric power source via the first converter and configured to send the electric power to a heating element for controlling a blade tip clearance between a rotor blade and an outer structure of the gas turbine engine, and a controller in electronic communication with the second converter. The hybrid electric power source may comprise a battery, a supercapacitor, and/or an ultracapacitor.

Abstract: In combination a wear indicator and a component of a gas turbine engine is provided. The wear indicator is secured to a surface of the component of the gas turbine engine. The wear indicator comprising: a first component including: a first plate; a second plate opposite the first plate; a plurality of wires extending from first plate to the second plate, wherein the first plate is electrically connected to the second plate through the plurality of wires; and a potting material configured to partially fill the first component and fill voids between the plurality of wires, such that the plurality of wires are electrically insulated from each other by the potting material.

Abstract: An airflow mask tool incudes a pressure side mask portion to seal at least a portion of a pressure side of a component having an array of internal passageways and a suction side mask portion to seal at least a portion of a suction side of the component, at least one of the suction side mask portion and the pressure side mask portion comprising at least one opening to expose at least one exit from the array of internal passageways.

Abstract: A turbomachine airfoil element includes an airfoil that has pressure and suction sides spaced apart from one another in a thickness direction and joined to one another at leading and trailing edges. The airfoil extends in a radial direction a span that is in a range of 3.84-4.14 inch (97.5-105.1 mm). A chord length extends in a chordwise direction from the leading edge to the trailing edge at 50% span and is in a range of 1.16-1.46 inch (29.5-37.1 mm). The airfoil element includes at least two of a first mode with a frequency of 326±10% Hz, a second mode with a frequency of 1252±10% Hz, a third mode with a frequency of 2475±10% Hz, a fourth mode with a frequency of 2951±10% Hz, a fifth mode with a frequency of 4356±10% Hz and a sixth mode with a frequency of 6086±10% Hz.

Abstract: The present invention provides a deep learning regulation and control and assembly method and device for large-scale high-speed rotary equipment based on dynamic vibration response properties. The present invention starts from geometrical deviation of multiple stages of rotor/stator of an aircraft engine, amount of unbalance of rotor/stator, rigidity of rotor/stator and vibration amplitude of rotor/stator, considers the influence of the area of the assembly contact surface between two stages of rotors/stators, and sets the rotation speed of rotor/stator to be the climbing rotation speed to obtain vibration amplitude parameters.

Abstract: A fixing device fixes a relative position in a rotational direction of an outer member and an inner member of a stationary body of the rotary machine, and includes: a radial pin that is inserted into a through hole passing through the outer member in a radial direction of a rotary machine and having a stepped portion formed therein to have a larger diameter at a portion on an outer side in the radial direction of the rotary machine than at a portion on an inner side in the radial direction, that has a part on the inner side in the radial direction of the rotary machine to be inserted into a concave portion of the inner member, and that has a flange portion on the outer side in the radial direction of the rotary machine.

Abstract: A gas turbine and a method for replacing a bearing thereof to easily adjust a clearance of a bearing housing and a bearing covering a tie rod, such that the bearing can be easily replaced is disclosed.

Abstract: A flow mixing lobe for an exhaust diffuser includes a first flange member having a first leading end, a first trailing end, and an intermediate portion extending therebetween. A second flange member includes a second leading end, a second trailing end, and an intermediate section extending therebetween. A first leg portion includes a first end extending from the first flange member, and a second end. A second leg portion has a first end portion extending from the second flange member, and a second end portion. A wing member is arranged between the first and second leg portions at respective ones of the second end and second end portions. The wing member includes a flow conditioning surface having a non-linear profile extending between the second end and the second end portion.

Abstract: A condenser includes heat transfer pipe groups, a main body and an intermediate body. The intermediate body has an inlet that opens in a horizontal direction, and an outlet that opens downward. The main body has an inlet that opens upward and is connected to the intermediate body outlet. The heat transfer pipe groups are arranged in the horizontal direction and disposed in the main body. A near-side outlet edge is an edge of the intermediate body outlet on a side near the intermediate body inlet in the horizontal direction and a far-side outlet edge is an edge of the intermediate body outlet on a side far from the intermediate body inlet. At least one part of the main body is located below an imaginary line that connects the near-side and far-side outlet edges and at least one part of the main body is located above the imaginary line.

Abstract: A combined cycle power plant feedwater system includes: a feed pump which supplies feedwater to a heat recovery steam generator; a first pipe which extracts part of the feedwater from a flow path in mid-course of pressurization of the feed pump; a first boiler supplied with the feedwater led into the first pipe and subjected to first water treatment; a second pipe where the feedwater discharged from a feed pump outlet flows; a second boiler supplied with the feedwater led into the second pipe and subjected to second water treatment more downstream than the flow path in mid-course of the pressurization; and a water-treating substance supply device which supplies a water-treating substance for the second water treatment to the feedwater flow path in the feed pump, at a position more downstream than a connection position of the first pipe and more upstream than a connection position of the second pipe.

Abstract: An oil control valve for a cam phaser of an internal combustion engine where the spool is positioned by an external actuator. The valve includes a spool assembly including a spool that is axially movable in a central opening, and there is at least one groove in the spool. The groove substantially increases fluid flow through the hydraulic valve when opened. By controlling the size and position of the groove, the amount of the fluid flow may be controlled. Further fluid flow control may be had by controlling the size of holes in the spool. The increase of fluid flow attributable to the groove may be at least 50%, 100% or even 200% compared with the at least one groove being absent.

Abstract: A poppet valve has an elongated stem that is configured to extend along a longitudinal axis. The poppet valve further includes a valve body that is disposed laterally with respect to the longitudinal axis and located in a spaced apart relation with an end of the elongated stem. The valve body has a pair of opposing faces disposed co-axial with the longitudinal axis of the elongated stem. The poppet valve also includes at least two arcuately shaped appendages depending downwardly from the end of the elongated stem and extending away from the longitudinal axis of the elongated stem. An end of each appendage is disposed in abutment with an annular region defined on one of the opposing faces of the valve body, a perimeter of the annular region being larger than a perimeter of the elongated stem measured about the longitudinal axis.

Abstract: A system for lubricating an engine is disclosed. In one example, the system includes an oil purging passage in fluidic communication with an oil gallery within an engine block. The system may provide for reduced engine degradation related to debris that may be found in engine oil.

Abstract: An oil pan may include a pan body forming a dual chamber including a primary chamber and a secondary chamber, and a mesh. The primary chamber and the secondary chamber each contains a different amount of oil, and the mesh allows a different amount of oil permeation discharged from the secondary chamber to the primary chamber based on temperature of the oil.

Abstract: An engine assembly is provided. The engine assembly comprises a first housing defining a first oil gallery, a second housing defining a second oil gallery, and an alignment dowel configured to be received within the first and second housings to provide an alignment feature for locating first and second housings of an engine assembly relative to one another, wherein the alignment dowel comprises a groove formed in an outer surface of the dowel configured to receive oil from the first oil gallery, and wherein the dowel is configured to provide a flow channel for the received oil to flow to the second oil gallery. An alignment dowel for use in the engine assembly is also provided.

Abstract: Oil supply system for an internal combustion engine, whereby an internal oil pan is arranged in the internal combustion engine, whereby the oil supply system has an additional external oil reservoir which is arranged outside the internal combustion engine compared to the internal oil pan of the internal combustion engine, whereby a supply line to be connected to the internal combustion engine is provided, which leads to a filling opening of the oil reservoir, and whereby a return line to be connected to the internal combustion engine is provided, through which oil can be returned from the oil reservoir to the internal combustion engine, whereby the return line is connected to the oil reservoir and whereby the oil reservoir has at least one oil tank, whereby a removal opening of the return line is arranged near or in the base of the at least one oil tank.

Abstract: Methods and systems are provided for improving engine oil level sensing while a vehicle is moving. The output of a hot wire sensor partially immersed in an engine oil well is sampled during selected vehicle moving conditions when lateral and longitudinal acceleration is limited and the vehicle is driving in a straight line. A transfer function is used to correlate a rate of change in sensor output, sampled during the selected vehicle operating conditions, with engine oil level.

Abstract: A catalyst oxygen purge control method may include a catalyst oxygen purge control method during a cold engine period of a catalyst oxygen purge control apparatus which includes a three way catalytic converter through which an exhaust gas combusted when air and fuel are mixed in a combustion chamber is exhausted and the exhaust gas passes, wherein the method includes determining whether a fuel cut condition of an injector which injects the fuel to the combustion chamber is satisfied, performing fuel cut of the injector when the fuel cut condition is satisfied, measuring an oxygen storage capacity of the three way catalyst, and adjusting an oxygen purge time based on the measured oxygen storage capacity.

Abstract: An assembly for treating gaseous emissions has a substrate with cells for the passage of an emissions gas to be treated and inductive heating elements located in some of the cells. An electromagnetic field generator mounted near the substrate generates a varying electromagnetic field, so as to inductively heat the inductive heating elements and so heat the substrate. Some of the inductive heating elements have a first natural resonant frequency other inductive elements have a second natural resonant frequency different from the first resonant frequency. A power supply for the electromagnetic field generator is operated with a frequency closer to the first resonant frequency for a time and is operated with a frequency closer to the second resonant frequency period for a subsequent time period. By switching between the frequencies at different times, the heating profile can be moved in the substrate.

Abstract: An exhaust treatment device for a diesel engine includes a parked regeneration requirement notification component, and a parked regeneration start operation component, a regeneration process of a diesel particulate filter includes an automatic regeneration process and a parked regeneration process, the automatic regeneration process is automatically started when an estimation value of particulate material accumulated in the diesel particulate filter reaches a predetermined value, and the parked regeneration process is performed when first and second conditions are satisfied, the first condition being that a parked regeneration requirement notification component performs a notification of a parked regeneration requirement when a number of cancellations of the automatic regeneration process reaches a predetermined value or more, the second condition being that the parked regeneration start operation component is subjected to a start operation during a parked state in which an engine equipped machine is neither

Abstract: Methods for monitoring and/or regenerating a selective catalytic reduction particulate filter (SCRF) are provided. The SCRF comprises a porous filter substrate and a catalytic composition capable of reducing NOx applied thereto. Methods include determining a SCRF pressure differential (dP) and determining the SCRF soot loading using a 1st SCRF dP map if the SCRF has not been degreened, or a 2nd SCRF dP map if the SCRF has been degreened. The SCRF has been degreened if one or more of a degreening cumulative time and temperature threshold has been achieved and a filter regeneration count threshold has been achieved. The 1st and 2nd SCRF dP maps correlate SCRF dP and one or more of SCRF temperature, exhaust mass flow, and exhaust volumetric flow to a SCRF soot loading. The method can optionally further include initiating a filter regeneration if the determined SCRF soot loading is above a soot loading threshold.

Abstract: A heater is provided that includes at least one resistive heating element having a material with a non-monotonic resistivity vs. temperature profile and exhibiting a negative dR/dT characteristic over a predetermined operating temperature range along the profile. The heater can include a plurality of circuits disposed in a fluid path to heat fluid flow.

Abstract: Nitrous oxide (NOx) sensors and related methods and systems for use with combustion processes. The NOx sensor uses metal oxide semiconductors. The NOx sensor may have two sensing circuits that share a common electrode. The sensing circuits are differentiated by having different porous catalytic filter coatings protecting the metal oxide semiconductors: one sensing circuit has a porous catalytic filter coating that contains a Noxcat material (rhodium, ruthenium, cobalt, palladium, or nickel), while the porous catalytic filter coating of the other sensing circuit is substantially free of Noxcat material. The two sensing circuits are simultaneously exposed to the exhaust gases at a common macro location. The NOx level may be determined based on a difference in resistance between the two sensing circuits and a temperature of the NOx sensor.

Abstract: A vehicle has an internal combustion engine and an exhaust system. The exhaust system has a first exhaust tract with a first exhaust outlet extending into the atmosphere as well as a second exhaust tract with a second exhaust outlet extending into the atmosphere. The second exhaust outlet is located in front of the first exhaust outlet in the direction of travel of the vehicle.

Abstract: A water separator for use in a marine exhaust system comprises a horizontally disposed, generally cylindrical housing including a wet exhaust inlet, a dry exhaust outlet, and a water outlet. Wet exhaust entering the wet exhaust inlet is constrained against the inner housing wall by a variable geometry vane or baffle which causes the wet exhaust to accelerate such that centrifugal force causes the entrained water to separate from the exhaust gas. Separated water encounters a longitudinally disposed barrier and flows to the water outlet for discharge from the vessel. A tubular dry exhaust pipe is longitudinally disposed within the housing and includes an inlet disposed in proximity to a first end thereof, and an outlet projecting from a second end thereof.

Abstract: An aftertreatment system can include a radiation shield for reducing and/or redirecting radiative thermal energy. The aftertreatment system can include a first housing, a second housing, a first aftertreatment component, and the radiation shield. The first aftertreatment component is positioned within one of a first interior volume of the first housing or a second interior volume of the second housing. The radiation shield includes an attachment portion and a thermal barrier portion. The attachment portion is coupled to an exterior of the first housing or the second housing. The thermal barrier portion is structured to divert radiative thermal energy in a second direction different than a source direction of the radiative thermal energy.

Abstract: A closed-loop cooling ship propulsion apparatus includes a power device, a pump, and a coolant supply. A fluid circuit is formed in the ship propulsion apparatus and a coolant in the loop can be arranged to circulate through all heat-generating components in addition to the pump and motive power unit. A closed-loop circuit avoids the blockages and contamination which might occur if the water of a sea or lake was used directly.

Abstract: An auxiliary machine-driving device is provided for a vehicle. The auxiliary machine-driving device has a first roller, a second roller, a third roller, a fourth roller and a fifth roller. The first roller rotates integrally with a rotary shaft of an engine. The second roller rotates integrally with a rotary shaft of a motor/generator. The third roller rotates integrally with a rotary shaft of an auxiliary machine. The fourth roller is provided between the first roller and the second roller. The fifth roller that always contacts the second roller and the third roller. The actuator switches the fourth roller between a contact state with the first and second rollers and a separation state from the first and second rollers.

Abstract: An electronic thermostat may include an internal housing including a partition defining a head chamber communicating with a cylinder head and a block chamber communicating with an engine block and the internal housing of which a head chamber hole and a block chamber hole are formed thereto, an external housing of which an outlet is formed thereto and the external housing covering the internal housing, a thermostat heater disposed to the partition, a first opening/closing portion including a first wax receiving heat from the thermostat heater and selectively closing or opening the head chamber hole and a second opening/closing portion including a second wax receiving heat from the thermostat heater and selectively closing or opening the block chamber hole.

Abstract: A method for charging coolant in a cooling system for a vehicle may include determining a vehicle-diagnostic apparatus connection that determines whether a diagnostic apparatus configured for charging coolant has been connected to a vehicle; starting a coolant charging mode for charging the coolant by the diagnostic apparatus; and determining whether a coolant charging mode release condition has been satisfied after starting the coolant charging mode.

Abstract: A control method for a cooling system is provided. The method includes determining whether the output signals of a first coolant temperature sensor and a second coolant temperature sensor satisfy a predetermined coolant overheating condition. A coolant control valve unit is operated to move the cam to a maximum position when the predetermined coolant overheating condition is satisfied. Additionally, a control temperature is determined according to an output signal of the first coolant temperature sensor and the second coolant temperature sensor and an operation of the injector is limited according to the determined control temperature.

Abstract: An inlet tank for a charge cooler comprises a manifold portion, a turbocharger inlet port, and a supercharger inlet port. The turbocharger inlet port is in fluid communication with a compressor wheel of a turbocharger and the manifold portion of the inlet tank. An opening is formed in a sidewall of the turbocharger inlet port. The supercharger inlet port is in fluid communication with an electric supercharger and intersects the turbocharger inlet port. The opening formed in the sidewall of the turbocharger inlet port provides fluid communication between the supercharger inlet port and the turbocharger inlet port. A valve element selectively determines when a flow of air from the supercharger inlet port enters the turbocharger inlet port through the opening based on a pressure differential present between the air exiting the compressor wheel of the turbocharger and the air exiting a compression mechanism of the electric supercharger.

Abstract: An engine system may include an engine including a plurality of combustion chambers generating driving torque by combustion of fuel, an intake line through which outside air supplied to the combustion chamber flows, an exhaust line for exhausting the exhaust gas from the combustion chamber to the outside, a turbocharger including a compressor mounted in the intake line and a turbine mounted in the exhaust line, an air supply passage through which a portion of the outside air branched from the intake line and supplied to the combustion chamber, an air supply nozzle connected to the air supply passage and supplying the part of the outside air to the combustion chamber, an air supply pump provided in the air supply passage and providing an injection pressure to the part of the outside air injected into the combustion chamber, and a controller for controlling the air supply nozzle and the air supply pump.

Abstract: A turbocharger engine includes a dual stage turbocharger in which a first turbo unit is disposed on the upstream side of a second turbo unit on an exhaust passage. The turbocharger is disposed in such a manner that a second turbine shaft of the second turbo unit is far from an engine output shaft than a first turbine shaft of the first turbo unit in a plan view in an axis direction of a cylinder. Further, a second turbine is rotated clockwise around an axis thereof in a side view when the turbocharger is viewed from the side of the turbine, and an intra-turbine passage is disposed on the side of an engine body than the second turbine shaft.

Abstract: A multi-stage turbo supercharging system includes: a bypass passage which bypasses a turbocharger from among a plurality of turbochargers, in an intake passage or an exhaust passage of the engine; a bypass valve disposed in the bypass passage; an operation mode selection part; a bypass valve opening degree map selection part configured to select at least one bypass valve opening degree map in accordance with the operation mode selected by the operation mode selection part, from among a plurality of bypass valve opening degree maps which represent respective relationships between a plurality of control parameters of the engine and an opening degree of the bypass valve; a bypass valve opening degree determination part configured to determine an opening degree command value for the bypass valve on the basis of the bypass valve opening degree map and control parameter information representing the plurality of control parameters; and a bypass valve opening degree control part configured to control the opening degr

Abstract: A control system and method for an engine including a turbocharger without a surge valve involve utilizing one or more pressure sensors configured to measure air pressure in an intake system of the engine, the intake system comprising a compressor of the turbocharger and a throttle valve downstream from the compressor, and a controller configured to control the engine to avoid surge at the compressor and eliminate a need for the surge valve by determining a desired position for the throttle valve based on a driver requested engine torque, determining a minimum mass flow through the compressor that avoids surge based on the measured air pressure in the intake system and a predetermined compressor map, and commanding the throttle valve to a target position to maintain at least the minimum compressor mass flow, wherein the target position is greater than the desired position, thereby avoiding surge at the compressor.

Abstract: A chambered sparkplug carrier and a natural gas engine management system are provided for reducing NOx emissions of pre-chambered combustion natural gas engines. A method for retro-fitting a pre-chambered combustion natural gas engine with a chambered sparkplug is also described.