Abstract: Various embodiments of the invention include systems for controlling cold-reheat extraction in a turbomachine system. Some embodiments include a system having: a high-pressure (HP) turbine section including an exhaust; a reheater conduit fluidly connected with the exhaust of the HP turbine and a reheater, the reheater conduit for passing HP exhaust steam from the HP turbine section to the reheater; a cold-reheat extraction conduit fluidly connected with the reheater conduit upstream of the reheater and downstream of the HP turbine section exhaust; and a control system coupled with the HP turbine section and the cold-reheat extraction conduit, the control system configured to: obtain data about a temperature of the HP exhaust steam; and provide instructions to modify a flow rate of the HP exhaust steam to the reheater in response to the temperature of the HP exhaust steam exceeding a threshold.

Abstract: Disclosed illustrative embodiments include systems and methods for power peaking with energy storage. In an illustrative, non-limiting embodiment, a power plant includes a thermodynamic piping circuit having a working fluid contained therein, and the working fluid has a flow direction and a flow rate. Power plant components are interposed in the thermodynamic piping circuit. The power plant components include a compressor system, a recuperator system, a heat source, a turbine system, a heat rejection system, and a thermal energy storage system. A valving system is operable to selectively couple the heat rejection system, the thermal energy storage system, and the compressor system in thermohydraulic communication with the working fluid maintaining the flow direction and the flow rate to implement a thermodynamic cycle chosen from a Brayton cycle, a combination Brayton cycle/refrigeration cycle, and a Rankine cycle.

Abstract: A tappet (1) having a tube-like housing (2), which in the region of one of the end faces (3) thereof receives a roller (5) running on a pin (4) and serving for contact with a periodic stroke generator. The pin (4) is mounted via the ends (6) thereof in a flat (8) that is indented from an outer surface (7) of the housing, wherein in the housing (2), axially beneath the roller (5), means (9) are provided for an at least indirect bearing of a tappet follower member. The housing (2) is formed of an extruded profile having profiling on the inner surface (10) of the housing (2), wherein, viewed in a circumferential direction of the housing (2), at least twothick-wall profile segments and two thin-wall profile segments (11, 12) are present. The thick-wall profile segments lie diametrically opposite each other and the thin-wall profile segments lie diametrically opposite each other, and the flat portions (8) are located in the thick-wall profiled segments (11).

Abstract: A switching roller finger follower including: a housing including first and second walls; a first secondary arm pivotably connected to the housing and including a first groove; a second secondary arm pivotably connected to the housing and including a second groove; and a roller disposed between the first and second walls and including an axle passing through the walls and having a first end disposed in the first groove and a second end disposed in the second groove. A method of fabricating a switching roller finger follower, including: disposing a roller between first and second walls for a housing; passing an axle through the roller and the walls; pivotably connecting first and second secondary arms to the housing; disposing a first end of the axle in a first groove in the first arm; and disposing a second end of the axle in a second groove in the second arm.

Abstract: A retention device for a valve actuating mechanism to secure a finger follower and lash adjuster together includes a ring member disposed in a groove of a movable piston of the lash adjuster. The retention device also includes a connecting member having a plurality of legs adapted to engage the finger follower and an intermediate base interconnecting the legs and adapted to be disposed below the ring member and about a portion of the lash adjuster to effect a free movement of the connecting member in all pivoted positions of the finger follower.

Abstract: A detent assembly and a method of assembling the detent assembly are disclosed. The detent assembly includes a first shaft rotatable about a longitudinal axis and has an outer surface. The first shaft defines a cavity having an opening defined by the outer surface. The detent assembly further includes a camshaft defining an aperture along the longitudinal axis to present an inner wall of the camshaft that circumscribes the longitudinal axis. The inner wall defines a plurality of recesses spaced from each other. The detent assembly also includes a self-contained plunger unit that is secured to the first shaft in the cavity as a unit. A plunger of the self-contained plunger unit engages the inner wall as the camshaft is disposed over the self-contained plunger unit so that the plunger rests in one of the recesses of the camshaft to selectively secure together the first shaft and the camshaft.

Abstract: A disclosed lubrication system for an internal combustion engine includes an inertia reactive oil injector in a piston that reacts to convey lubricating oil to the space between the piston and its adjacent cylinder wall immediately below the upper piston rings as the piston reaches top dead center. A first embodiment utilizes a passage and reservoir formed beneath the piston wall with inlet and outlet ports at each end. The oil injector carries the oil past the intake/exhaust ports of the cylinder until the piston decelerates while approaching its TDC position. During that deceleration, the oil carried by the injector reservoir is delivered through the outlet port into the space between the piston and the cylinder liner. A second embodiment utilizes a groove of predetermined length formed in the outer surface of the piston. A reservoir is formed in the groove and defines inlet and outlet ports at each end.

Abstract: A method is provided for detecting abnormally frequent diesel particulate filter (DPF) regeneration. The method includes measuring a pressure drop across the DPF and using the measured pressure drop to calculate a pressure drop based soot load estimate, calculating soot output from an engine model and using the calculated soot output to calculate an emissions based soot load estimate, comparing the pressure drop based soot load estimate with the emissions based soot load estimate, and providing a warning if a difference between the pressure drop based soot load estimate and the emissions based soot load estimate exceeds a predetermined.

Abstract: A regeneration system includes a first comparison module that at least one of (i) compares a first temperature of an adsorber to an adsorber release temperature and (ii) compares a second temperature of an engine to a predetermined temperature, and generates a first comparison signal. A second comparison module that compares a particulate matter output of the engine with a predetermined output and generates a second comparison signal. A mode selection module that selects a mode and generates a mode signal based on the first comparison signal and the second comparison signal. A bypass valve control module that adjusts position of a bypass valve to bypass at least one of a particulate matter (PM) filter and the adsorber based on the mode signal.

Abstract: A method for operating an exhaust gas system of a motor vehicle involves performing regeneration of the particle filter as a function of at least one aging value characterizing an aging condition of the oxidation catalytic converter.

Abstract: A system and method for drying pulverized high moisture fuel for use in a selective catalytic reduction system equipped combustion system is provided. The combustion system includes a mill for pulverizing fuel, an air heater, a booster air heater and a fuel duct for feeding dried pulverized fuel to a combustion furnace.

Abstract: The invention relates to a method for regenerating nitrogen oxide storage catalytic converters and to a correspondingly adapted exhaust-gas purification system for lean-burn engines. In particular, the present invention relates to the regeneration of nitrogen oxide storage catalytic converters during special driving situations of the vehicle.

Abstract: In a vehicle including an engine, an electrically heatable catalyst device (EHC), and a first motor generator that generates electric power in accordance with the engine's motive power with the vehicle in a substantially stopped state with a vehicular speed lower than a threshold vehicular speed, an ECU determines, based on an amount A by which an accelerator pedal is operated and a vehicular speed V, whether a large accelerator operation has been performed with the vehicle in the substantially stopped state. If the ECU determines that the large accelerator operation has been performed with the vehicle in the substantially stopped state, the ECU activates an energization timer, and before the energization timer reaches a reference energization period of time ?, the ECU energizes the EHC, and once the energization timer has reached the reference energization period of time ?, the ECU ceases energizing the EHC.

Abstract: A selective catalytic reduction and catalytic regeneration system includes: a main exhaust flow path; a reactor which is installed on the main exhaust flow path; a bypass exhaust flow path which branches off from the main exhaust flow path, and bypasses the reactor; an ammonia injection unit, which injects ammonia to the exhaust gas which is to flow into the reactor; a hydrolysis chamber, which produces ammonia to be supplied to the ammonia injection unit; a branch flow path, which branches off from the main exhaust flow path at a front side of the reactor; a recirculation flow path, which branches off from the main exhaust flow path at a rear side of the reactor, and merges with the branch flow path; and a multifunctional flow path, which connects the hydrolysis chamber with a point where the branch flow path and the recirculation flow path merge together.

Abstract: An after-treatment system for treating exhaust gas discharged from a combustion engine, the after-treatment system comprising an exhaust after-treatment component including an exhaust after-treatment substrate, the exhaust after-treatment substrate including an inlet face including a first zone having a first catalyst located at a center of the inlet face, and a second zone having a second catalyst located radially outward from the center of the inlet face, wherein an amount of the exhaust gas that travels through the first zone is greater than an amount of the exhaust gas that passes through the second zone, and a catalyst loading of the first catalyst in the first zone is less than a catalyst loading of the second catalyst in the second zone.

Abstract: Systems and devices for delivering a fluid to an exhaust system. An inlet is configured for receiving the fluid, and a conduit includes openings for expelling the fluid into the exhaust system. A compact gaseous delivery system may include a first conduit in fluid communication with a fluid source, a second conduit in fluid communication with the first conduit, and a plurality of additional conduits in fluid communication with the second conduit and including a plurality of openings for expelling the fluid into the exhaust system. The first conduit, second conduit, and plurality of additional conduits may have axes that are substantially coplanar to form the compact gaseous delivery system that may be disposed within the exhaust system. Implementations may include openings with varying diameters. Other implementations may include a volute conduit with openings.

Abstract: In order to suppress ammonia from flowing out during regeneration treatment of a filter carrying an SCR catalyst, the prevent invention provides an exhaust emission control system of an internal combustion engine, including a first stage catalyst having an oxidation function, a fuel supply device configured to supply fuel to the first stage catalyst, a filter provided in the exhaust passage downstream of the first stage catalyst and carrying a selective redaction type NOx catalyst, an ammonia supply device configured to supply ammonia to the filter, a filter-regeneration-treatment executing unit configured to execute filter regeneration treatment, and a control unit configured to supply, when the filter regeneration treatment is not executed, the ammonia in an amount corresponding to an amount of the NOx emitted from the internal combustion engine, and to supply, when the filter regeneration treatment is executed, the ammonia in an amount corresponding to an amount of the NOx obtained by subtracting, from the

Abstract: To provide a reducing agent supply apparatus that makes it hard to refill the pump side with a liquid reducing agent upon completion of the suck back control of the liquid reducing agent and a method for control the reducing agent supply apparatus. The method for controlling the reducing agent supply apparatus pressure-feeds the liquid reducing agent in a storage tank using a pump and injects the liquid reducing agent into an exhaust passage of the internal combustion engine through a reducing agent injection valve when the internal combustion engine is operating and, when the internal combustion engine stops, sucks the liquid reducing agent remaining in a reducing agent supply path back to the storage tank, in which the suck back control starts when the internal combustion engine stops and, when the suck back control ends, a reducing agent passage interconnecting the pump and the storage tank is opened to air.

Abstract: A diesel oxidation catalyst component may include an inlet, an outlet, and a catalyst chamber body in fluid communication with the inlet and the outlet. An angled jacking bolt assembly is configured to secure a diesel oxidation catalyst within a catalyst chamber defined by the catalyst chamber body. In some implementations, a spacing component or a second diesel oxidation catalyst may be included and secured by the angled jacking bolt assembly. The catalyst chamber body may include an access panel assembly that includes an access panel and securing bolts. The access panel assembly may substantially fluidly seal an opening defined by a mount of the catalyst chamber body when the access panel is secured to the mount by the plurality of securing bolts. The opening may be sized to permit removal of the diesel oxidation catalyst from within the catalyst chamber.

Abstract: Systems, methods and apparatus are disclosed for disabling control of one or more outputs of an internal combustion engine system in response to an engine-out NOx sensor during a high frequency pressure pulsation associated with the exhaust gas at the engine-out NOx sensor. A high frequency pressure pulsation event may be determined in response to a pressure sensor measurement, or in response to operating parameters of one or more components of the system indicating high torque output conditions, and/or by a blade position of a turbine adjacent the NOx sensor indicating passage of the exhaust gas pressure pulsations to the NOx sensor.

Abstract: A system includes an internal combustion engine providing exhaust gases to an exhaust conduit, an aftertreatment system having an SCR catalyst component and disposed in the exhaust conduit. The system further includes a first NH3 sensing element preferentially sensitive to NH3 and a second NH3 sensing element preferentially sensitive to NO2 in the exhaust conduit. Both NH3 sensing elements are positioned downstream of the SCR catalyst component. The system includes a controller having a test conditions module that determines whether an NO2 concentration downstream of the SCR catalyst component is below a threshold value, an NH3 diagnostic module that provides a detection comparison value in response to the NO2 concentration, a first signal from the first NH3 sensing element, and a second signal from the second NH3 sensing element. The controller includes a sensor condition module that provides an NH3 sensor condition value in response to the detection comparison value.

Abstract: In an exhaust device in a motorcycle including an article storage pannier at a side portion of a rear portion of the motorcycle, a rear end surface of a muffler which discharges exhaust gas to the outside is located frontward of a front end surface of the pannier, and an outlet pipe of the muffler is curved such that the exhaust gas is discharged to a region below the pannier. An axis of the muffler is inclined so as to extend rearward and upward. A plurality of the outlet pipes are aligned vertically, and the upper outlet pipe is curved.

Abstract: A dump truck includes: a main frame; an engine installed in the main frame; and an exhaust aftertreatment device that purifies exhaust gas from the engine. The main frame includes a vertical member in a portal shape which projects in a vehicle height direction of the dump truck and extends in a vehicle width direction of the dump truck. The exhaust aftertreatment device is supported by the vertical member. With this arrangement, maintenance of the engine can be conducted while the exhaust aftertreatment device is kept attached to the vertical member.

Abstract: A mounting system for connecting an aftertreatment component to an engine is disclosed. The mounting system may include at least one flange. The mounting system may also include a support structure having a first end connected to the at least one flange, and a second end connected to an outer shell circumferentially wrapped around the aftertreatment component. The mounting system may further include at least one seal disposed between the outer shell and an outer surface of the aftertreatment component. The at least one seal may be configured to isolate vibration of the engine from the aftertreatment component.

Abstract: A rapid cooling device for a motor vehicle including a motor vehicle component performing a first technical function of covering for a proximal surface opposite it, the vehicle component including a diffusion mechanism for performing a technical function of rapidly diffusing a liquid that has been injected toward the proximal surface opposite it, with a view to reducing a surface temperature of the proximal surface opposite it.

Abstract: A cooling system for thermal management of an electric vehicle having a range extender. The temperature of the components of the electric drive system of the electric vehicle and at least that of the internal combustion engine of an internal combustion engine/generator unit of the range extender are controlled by separate cooling circuits. The cooling circuit of the electric drive and the cooling circuit of the internal combustion engine are coupled to one another thermally by a heat exchanger.

Abstract: A water pump is disposed so as to be mounted on a cylinder head cover of an engine. An electric motor is disposed continuously from the water pump. The water pump sends cooling water to a water jacket of a cylinder block via a cooling water pipe disposed so as pass in front of the cylinder head cover and a cylinder head. In an upper end portion of a radiator, an inlet through which the cooling water is led from the engine is disposed on the left and an outlet through which the cooling water is supplied to the water pump is disposed on the right. The inlet is connected to the cylinder block via a cooling water pipe, and the outlet is connected to the water pump via a cooling water pipe.

Abstract: An air-actuated fan clutch having a translatable piston in communication with a pressure chamber and moveable between a piston neutral position and a piston activated position in response to air pressure. A clutch spring biases a clutch housing into engagement with a clutch element that is coupled for rotation with a drive shaft when the piston is in the piston neutral position. Movement of the piston to the piston activated position moves the clutch housing away from the clutch element to inhibit transmission of rotary power through the fan clutch. A valve and an actuator are provided to prevent movement of the piston from the piston neutral position when air pressure acting on the piston would be below a predetermined threshold.

Abstract: A toroidal combustion chamber shape with side injectors is being developed for an opposed-piston engine. Favorable combustion characteristics of such configuration are transferred to a conventional engine, i.e., one with a combustion chamber delimited by a piston, a cylinder wall, and a cylinder head. At least one injector is disposed in the cylinder head at the periphery. The fuel is injected substantially along the plane of interface between the cylinder head and the cylinder block. The intake system is configured to provide a swirling flow in the combustion chamber. The fuel is injected in an angle that is displaced from the central axis of the cylinder and directed along the swirl. In some embodiments, a substantially torus-shaped volume is formed between the piston and the cylinder head when the piston is at top center. The injector or injectors spray fuel into the toroidally-shaped volume substantially tangent to the torus.

Abstract: A system, apparatus and method for maintaining power in an internal combustion typically turbocharged aircraft engine is disclosed. During descent, air pressure and temperature in the manifold can fall to dangerous levels. This is because engine power is low and likewise turbocharger output is also low. The system and method provide for a bypass of the heat radiator during low power periods, or with low ambient temperature or both. A parameter is measured, often manifold pressure or temperature and the degree of bypass is adjusted commensurately.

Abstract: A method for controlling intake airflow in an internal combustion engine including an intake air compressor includes determining a first compressor boost signal based upon a predetermined intake manifold pressure command, determining a second compressor boost signal based upon a predetermined exhaust pressure limit, determining a compressor boost control command based upon the first compressor boost signal and a limit comprising one of a maximum boost setting and said second compressor boost signal, and controlling the intake air compressor in response to the compressor boost control command.

Abstract: Methods and systems are provided for adjusting a volume control valve attached to a branch of a split exhaust manifold in a boosted engine system. Volume control valve adjustments are used at different engine operating conditions to improve engine performance and boost response. One example method includes closing the volume in response to a tip-in when increased boost is needed for exhaust turbine spool-up.

Abstract: A method of and apparatus for operating a supercharger for an automotive engine is disclosed. The supercharger has: an input shaft for coupling to an engine crankshaft, and coupled to the rotor of a first electrical machine and a first component of an epicyclic gear train; and an output shaft connected to a compressor and a second component of the epicyclic gear train; wherein the third component of the epicyclic gear train is connected to the rotor of a second electrical machine. The first electrical machine is selectively operable to supply electrical energy to the second electrical machine. The method includes the steps of: (a) calculating a required speed of the second electrical machine that would give rise to a required pressure at an outlet of the compressor; and (b) setting the speed of the second electrical machine to the calculated required speed.

Abstract: A method for controlling a heat recovery device in an internal combustion engine, in particular, for a motor vehicle. The heat recovery device is provided with a circuit for a working medium having an evaporator of an expansion machine that is arranged in an exhaust gas flow path of the internal combustion engine, a condensor, an expansion tank, and a feed pump. The working temperature of the working medium is controlled by varying the mass flow of the working fluid as a function of at least one operating parameter. A setpoint value of the working medium mass flow of an exhaust gas flow path of an exhaust gas tract and/or an exhaust gas recirculation line is calculated on the basis of a base setpoint value for the working medium mass flow. The base setpoint value for the working medium mass flow is at least a function of the exhaust gas temperature, preferably upstream of the evaporator, and of the exhaust gas mass flow in the exhaust gas flow path.

Abstract: Direct circular rotary internal-combustion engine with toroidal expansion chamber and rotor without moving parts, which directly converts the combustion expansion into a rotary movement of the shaft thereof, receives the compressed oxidizing agent at high pressure, does not require inertia in order to function, and in which combustion can take place in a static combustion chamber.

Abstract: A vehicle propulsion system and method of operation are presented. As one example, cylinder deactivation and transitioning from four to two strokes is coordinated with transmission shifting to improve vehicle response. Additionally, it is possible to reduce transitions in operating modes to improve drive feel.

Abstract: An opposed piston engine includes at least one cylinder with a bore surface and longitudinally-spaced exhaust and intake ports that open through the sidewall of the cylinder. A pair of opposed pistons is disposed in the cylinder for sliding movement along the bore surface. An oil-retaining surface texture pattern in an interface between the pistons and the bore surface extends in a longitudinal direction of the cylinder, aligned with bridges of at least one port. The surface texture pattern includes a plurality of separate recesses on an outside surface of a skirt of each piston. Alternatively, or in addition, the surface texture pattern includes a plurality of separate recesses extending in a longitudinal direction of the cylinder, aligned with bridges of at least one port.

Abstract: An exhaust gas collector for use in a duct of an exhaust gas aftertreatment system includes generally T-shaped tubular sample members having closed upstream ends, downstream ends and spaced apart exhaust collection holes. The downstream ends of the tubular members are fluidly coupled at a common collection location in the center of the duct. The tubular members are positioned in the duct with the exhaust collection holes at locations distributed across a cross sectional area of a duct to collect exhaust samples from across the cross sectional area of the duct. All exhaust gas samples collected by the exhaust gas collector are collected by one of the sample members having a downstream end coupled to the common collection location. A non-sample collecting accumulator tube is fluidly coupled to the common collection location of the tubular sample members. A sensor senses the mixed exhaust gas in the accumulator tube.

Abstract: A supersonic inlet includes a relaxed isentropic compression surface to improve net propulsive force by shaping the compression surface of the inlet to defocus the resulting shocklets away from the cowl lip. Relaxed isentropic compression shaping of the inlet compression surface functions to reduce the cowl lip surface angle, thereby improving inlet drag characteristics and interference drag characteristics. Supersonic inlets in accordance with the invention also demonstrate reductions in peak sonic boom overpressure while maintaining overall engine performance.

Abstract: An engine may have a recuperator that may be powered by an electrical generator driven by the engine. The recuperator may be disposed within or incorporated into a compressor discharge of the engine, such as in the form of a vane or tube. The engine may be configured to operate in a variety of modes at least some of which may use thermal energy from the recuperator to heat a fluid flow stream of the engine. An energy storage device may be used with an electrical generator to provide power to a load.

Abstract: A bifurcation assembly for a gas turbine engine is disclosed and includes a housing defining an inner cavity. A first partition and a second partition extend across the inner cavity and define a buffer area therebetween. Openings through the first and second partitions define passageway for supply conduits. A control device governs the flow of a purge gas into the buffer area for blocking the spread of fire. The purge gas provides a barrier to the spread of fire and heat through the bifurcation assembly.

Abstract: A turbomachine seal includes, among other things, a sealing member configured to be influenced by both hydrostatic and hydrodynamic forces when providing a seal.

Abstract: A power generation system has a fuel cell, a gas turbine, an exhausted oxidant line, a fuel gas supply line, an exhausted fuel gas supply line, a supply amount adjustment unit, and a control system including an information acquisition unit, a calculation unit, and a fuel gas supply control unit. The information acquisition unit acquires an output command of the gas turbine, an atmospheric temperature, a temperature of the exhausted oxidant supplied to the gas turbine, and a temperature of the exhausted fuel gas supplied to the gas turbine. The calculation unit calculates a heat input of the exhausted oxidant, calculates a heat input of the exhausted fuel gas, and calculates by the output command and the atmospheric temperature to calculate a gas turbine heat input command.

Abstract: A cam full close stopper defines a cam full close position that is a limit position of a rotatable range of a cam. A sensor element outputs a signal corresponding to a rotation angle of the cam. A signal processor changes the signal output from the sensor element into a sensor output. A storage part memorizes a data table representing a correspondence relationship between the rotation angle of the cam and the sensor output of the signal processor in a predetermined form, characteristics of the sensor output being adjustable at a plurality of points with respect to the rotation angle of the cam. The storage part memorizes the sensor output of the signal processor when the cam is fully closed at the cam full close position.

Abstract: An actuator of a variable compression ratio mechanism which includes: a control link; a control shaft; a housing; a wave gear speed reduction device arranged to transmit the reduced rotation speed to the control shaft; a first bearing portion which is provided between the control shaft and a wave generation device of the wave gear speed reduction device, and which rotatably supports a first axial end portion of the wave generation device; and a second bearing portion which is provided between the housing and the wave generation device, and which rotatably supports an second axial end portion of the wave generation device, at least one of the first bearing portion and the second bearing portion being disposed inside an axial width of an outer circumference portion of the wave generation device.

Abstract: Provided are a controller and a control method for a homogeneous charge compression ignition engine, which are capable of obtaining a highly efficient and stable combustion state over a wide range of load condition. A correction factor computing section executes combustion control with an excess air ratio smaller than approximately 3 when a predetermined condition is satisfied and computes a correction factor for correcting deviations between execution values of valve-opening timings and valve-opening periods of an intake valve and an exhaust valve and basic valve-opening timings and basic valve-opening periods of the intake valve and the exhaust valve which are previously determined for each operation condition, based on a timing at which an ion current becomes maximum detected by a combustion-timing detection section, in the combustion control with the excess air ratio smaller than approximately 3.

Abstract: In the present spark ignition internal combustion engine, a shortest self-ignition delay time ?min for a maximum cylinder internal pressure Pmax and a maximum cylinder internal temperature Tmax when equivolume combustion is realized is calculated by using a calculation formula which uses a cylinder internal pressure and a cylinder internal temperature to calculate an self-ignition delay time, and a knock limit ignition timing ITA is determined based on the calculated shortest self-ignition delay time.

Abstract: A system includes a turbocharged engine, sensors, and a controller. The engine includes an engine intake manifold, air intake manifold, a compressor, a first aftercooler device, a throttle that admits cooled compressed air to the engine intake manifold, and cylinders. The sensors determine engine status signals and include a first manifold pressure (MAP) sensor positioned with respect to the first aftercooler device, a second MAP sensor positioned with respect to the engine intake manifold, a mass airflow (MAF) sensor positioned in the air intake manifold, a first manifold temperature (MAT) sensor positioned in the engine intake manifold, and a second MAT sensor positioned between the first aftercooler device and the throttle. The controller executes a method to calculate a cylinder air charge using an oxygen level of post-combustion gasses and the engine status signals, and controls an operation of the engine using the calculated air charge via engine control signals.

Abstract: A machine includes a compression ignition engine fueled from common rail fuel injectors that predominately inject natural gas fuel that is compression ignited with a small pilot injection of liquid diesel fuel. When an engine shutdown command is communicated to an electronic controller, the supply of gaseous fuel to the gas rail is stopped and the gaseous fuel common rail is depressurized by continuing to run the engine and inject gaseous and liquid fuels while commanding a liquid pressure greater than the gas pressure. After the gas rail pressure has achieved an acceptable shutdown pressure, the engine is stopped. The gas rail pressure is then reduced to atmospheric pressure followed by the liquid fuel common rail being reduced to atmosphere pressure after stopping the engine.

Abstract: A method controls a direct-injection gaseous-fuelled internal combustion engine system to improve the conversion efficiency of an SCR converter that is operative to reduce levels of NOx. The method comprises detecting when the internal combustion engine is idling and timing the injection of a first quantity of fuel to begin injection when the engine's piston is near top dead center; and controlling the temperature of exhaust gas to be above a predetermined temperature that is defined by an operating temperature range that achieves a desired conversion efficiency for the selective catalytic reduction converter, by: (a) timing injection of the gaseous fuel to begin after timing for injection the first quantity of fuel, and (b) increasing exhaust gas temperature by increasing a delay in timing for injecting the gaseous fuel, while limiting the delay to keep concentration of unburned fuel exiting the combustion chamber below a predetermined concentration.