Abstract: An abnormality diagnostic device for an engine is provided. The abnormality diagnostic device includes an ECU that is configured to execute a temperature rise process so as to raise a temperature of a catalyst. The ECU is configured to determine whether the engine is in an abnormal state. The ECU is configured to store the following values (i) to (iv) in the abnormal state: (i) a speed of the engine, (ii) a load of the engine, (iii) a coolant temperature, (iv) an execution state indicative of whether the temperature rise process is executed. The ECU is configured to determine whether the engine has recovered from the abnormal state to a normal state based on a current speed of the engine, a current load of the engine, a current coolant temperature, and a current execution state of the temperature rise process.

Abstract: Provided is a booster device for driving an injector which can suppress an insufficiency of a boost voltage applied to the injector even when the fuel injection interval is short. A boost driver (switching element) is connected to a boost coil in series and turns on/off the conduction of the boost coil. A boost capacitor applies a voltage to the injector. A boost diode has an anode connected to a connection point of the boost coil and the boost driver and a cathode connected to the boost capacitor. A boost gate control circuit controls the boost driver to be turned on/off so as to increase a charging speed of the boost capacitor increases when a decision period indicating a period corresponding to an injection interval of the injector is equal to or less than the first threshold value.

Abstract: An injection control device controls a fuel injection valve driven by an electric power. The injection control device includes a current detection unit to detect a driving current supplied to a solenoid of the fuel injection valve, an identification unit to identify a theoretical model of the driving current in a state where a movable core moved by an electromagnetic force generated by the solenoid is at rest, and a state detection unit to detect a state of the movable core. The state detection unit detects the state of the movable core, based on a deviation between the driving current detected by the current detection unit and the theoretical model.

Abstract: A method for matching the performance of a plurality of electronic fuel injectors, includes: applying a supply voltage to a control module; applying an operating voltage signal having a pulse width to each of the plurality of electronic fuel injectors individually via the control module; measuring an amount of time that each of the plurality of electronic fuel injectors supplies fuel; individually adjusting an operating voltage supplied to each of the plurality of electronic fuel injectors to cause each of the electronic fuel injectors to deliver fuel for a substantially same amount of time.

Abstract: An evaporated fuel treating device includes a canister, a first purge passage connected to the canister, a second purge passage connected to a second end of the first purge passage and an intake passage, a purge control valve disposed in the first purge passage, a pulsation detection sensor disposed in the second purge passage, and an electronic control unit configured to execute abnormality detection control that detects abnormality of the second purge passage. The electronic control unit is configured to detect pulsation of a purge gas flowing through the second purge passage, based on an output signal from the pulsation detection sensor when the electronic control unit execute a control that opens and closes the purge control valve, and determine abnormality of the second purge passage, based on the detected pulsation.

Abstract: A control method for selecting an optimal multiple step operating mode for a multiple cylinder motor vehicle engine system having variable lift includes prioritizing each of a full torque capacity (FTC) mode having all cylinders operating at high lift, a first reduced capacity economy mode (RCE1) having all cylinders operating at low lift, and a second reduced capacity economy mode (RCE2) having fewer than all of the cylinders operating at low lift with at least one cylinder deactivated based on predicted fuel economy of each of the modes. Multiple constraints are applied to each of the prioritized modes including incorporating boost as one of the constraints by calculating a maximum torque capacity for each mode that is a function of a current boost pressure. A mode determination arbitration is conducted to identify if a change in mode is required.

Abstract: A cold-time fuel increasing section calculates, as increase correction values for a required injection amount, an increase-after-startup correction value, which attenuates with an increment of the number of times of combustion carried out after startup of the internal combustion engine, and a basic warmup increase correction value, which attenuates with an increase in a temperature of coolant in the internal combustion engine. The cold-time fuel increasing section calculates the increase correction values such that the increase-after-startup correction value when the port injection mode is selected is greater than the increase-after-startup correction value when the single direct injection mode is selected, and that the basic warmup increase correction value when the port injection mode is selected is less than the basic warmup increase correction value when the single direct injection mode is selected.

Abstract: A fuel injection control device is applied to an internal combustion engine that includes a port injection valve and a direct injection valve. The fuel injection control device includes a port warm-up judgment section, which judges whether the intake port has been warmed up, and an injection mode determination section, which determines the injection mode based on the engine speed and a predicted load rate. When determining the injection mode at the cold operation of the internal combustion engine, the injection mode determination section sets the range of the operation region of the internal combustion engine in which the direct-injection-only mode is selected as the injection mode to be broader in a case in which the port warm-up judgment section has judged that the port has not been warmed up than in a case in which the port warm-up judgment section has judged that the port has been warmed up.

Abstract: Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, operation of a port fuel injector is deactivated in response to an indication of reduced performance of a direct fuel injector so that degradation of the direct fuel injector may be reduced.

Abstract: A fuel injection controller for an internal combustion engine includes first and second calculation sections. The first calculation section acquires a fuel pressure at a predetermined point of time before an injection starting point of time and calculates an injection time using the acquired fuel pressure. The second calculation section acquires a fuel pressure when the injection starting point of time arrives and calculates the injection time by using the acquired fuel pressure. The controller is configured to, before starting the energization to the injector, set a point of time to stop energization to an injector based on a calculation result of the injection time by the first calculation section. The controller is also configured to, after starting the energization to the injector, reset the point of time to stop the energization to the injector based on a calculation result of the injection time by the second calculation section.

Abstract: A method for determining a time at which a fuel injector, for an internal combustion engine of a motor vehicle, is in a predetermined opening state comprises applying a predetermined electrical voltage profile to the solenoid drive, detecting the temporal profile of the current strength of a current flowing through the coil of the solenoid drive, detecting the temporal profile of the voltage across the coil, determining a function based on the temporal profile of the current strength and the temporal profile of the voltage, wherein the function represents the interlinked magnetic flux or a temporal derivative of the interlinked magnetic flux in the solenoid drive, and determining the time as the time at which the function has a characteristic feature.

Abstract: A method of calculating an angular position of a crankshaft at the occurrence of a fuel injection event includes integrating a first polynomial function, and integrating a second polynomial function. The integrated second polynomial function is then divided by the integrated first polynomial function to calculate the angular position of the crankshaft at the occurrence of the fuel injection event. The calculated angular position of the crankshaft at the occurrence of the fuel injection event may then be correlated to an absolute angular position of the crankshaft, relative to a Top Dead Center position of the crankshaft. The calculated angular position of the crankshaft at the occurrence of the fuel injection event may be used to adjust the injection timing of future fuel injection events.

Abstract: An internal combustion engine with coolant jackets is provided. The internal combustion engine includes a cylinder head coupled to a cylinder block to form a first cylinder, an upper head-associated coolant jacket including a coolant conduit traversing the cylinder head, a lower head-associated coolant jacket fluidly separated from the upper cylinder head coolant jacket and including a coolant conduit traversing the cylinder head vertically below the upper head-associated coolant jacket, and a block-associated coolant jacket including, a first coolant passage having an inlet in fluidic communication with a coolant pump outlet and an outlet in fluidic communication with an inlet of the lower head-associated coolant jacket, and a second coolant passage having an inlet in fluidic communication with an outlet of the lower head-associated coolant jacket and an outlet in fluidic communication with a heat exchanger.

Abstract: An engine and a method of forming an engine are provided. The engine has a block that defines a cooling jacket extending continuously about an outer perimeter of first and second siamesed cylinders. The block defines a series of head bolt bores intersecting a deck face such that each cylinder is surrounded by four bores. The jacket has a first floor and a second floor. The second floor is offset above the first floor and extends along an intake side of the block between midpoints of the first and second cylinders, respectively. The second floor is configured to decouple a relationship between the cooling jacket and the series of bores for each cylinder and reduce fourth order bore distortion for each cylinder.

Abstract: A cylinder head includes a water jacket. The water jacket includes multiple coolant spaces between combustion chambers adjacent. The multiple coolant spaces include a high-pressure space having relatively high internal pressures and a low-pressure space having relatively low internal pressures. The high-pressure space and the low-pressure space are alternately arranged with each other. The water jacket includes a first lateral passage passing through the low-pressure space and extending in the lateral direction of the cylinder head, and a communication passage passing between an intake valve hole and an exhaust valve hole, and allowing the high-pressure space and the low-pressure space to communicate with each other. A coolant outlet is connected to the first lateral passage. The coolant inlet is connected to the communication passage or the high-pressure space.

Abstract: Disclosed is a monoblock or cooling channel piston and a method for producing a monoblock piston for use in an internal combustion engine. A piston blank includes a circumferential collar protruding radially in the region of the piston crown is first produced and the collar is then shaped. A contact region on a top region of the piston skirts and the collar is shaped such that the outer circumferential edge thereof points at a distance to the contact region and forms a defined gap. The gap is then sealed by a closure element in order to form a closed cooling channel.

Abstract: The present disclosure relates to an internal combustion engine for a motor vehicle. The internal combustion engine has a cylinder head, a crankcase and a cylinder head gasket. The cylinder head, the cylinder head gasket and the crankcase form a sealing region for sealing at least one combustion chamber. A first recess is arranged within the sealing region and at a distance from the at least one combustion chamber. A first leakage gas passage extends from the first recess to a first surface exposed to the environment of the internal combustion engine or to a ventilation passage of the internal combustion engine.

Abstract: A nacelle includes a fixed structure supporting a fixed cowl and a movable cowl, the movable cowl being movable translationally between a closing position and an opening position. A blocker door is movably mounted rotationally on the nacelle between a closed position and an open position. The nacelle includes a drive mechanism of the blocker door and of the movable cowl between the closed/closing position and the open/opening position of the blocker door/movable cowl, respectively, and vice versa, the drive mechanism includes at least one actuator fixed, to the fixed structure of the nacelle and, to a fitting fixed to the movable cowl. The drive mechanism includes, for each actuator, a flexible member having a first end fixed to the fixed structure of the nacelle and a second end fixed to the fitting.

Abstract: There is provided a load distribution panel assembly for a gas turbine engine. The assembly has a panel structure having at least one circumferential structural panel having a first end, and a second end coupled to a fixed structure of the gas turbine engine. The circumferential structural panel has a first compliant portion extending away from the first end, and has a second stiffened portion angled with respect to and extending radially away from the first compliant portion, and terminating at the second end. The second stiffened portion has a closed stiffened cavity portion integral with a perimeter flange portion. The panel assembly converts fore/aft point load(s) applied to it by load applying apparatus(es), to hoop tension and compression loads, and reacts a load offset in in-plane load(s), to provide uniform load distribution of the fore/aft point load(s) to the fixed structure.

Abstract: A thrust reverser blocker door may comprise a proximal surface, a distal surface located opposite the proximal surface, a first attachment feature extending from the distal surface, a second attachment feature extending from the distal surface, a drag link housing extending from the distal surface, a first diagonal stiffener extending from the distal surface and extending between the first attachment feature and the drag link housing, a second diagonal stiffener extending from the distal surface and extending between the second attachment feature and the drag link housing, a first perimetrical stiffener extending from the distal surface and extending from the first attachment feature and the drag link housing, a second perimetrical stiffener extending from the distal surface and extending from the second attachment feature and the drag link housing, and a middle stiffener extending between the first attachment feature and the second attachment feature.

Abstract: In one exemplary embodiment, a gas turbine engine includes a bypass flow ratio greater than about ten. A fan supported on a fan shaft having a plurality of fan blades and a low fan pressure ratio of less than 1.45 measured across the fan blades alone. A gutter with an annular channel. A gear system connected to the fan shaft having a gear reduction ratio greater than 2.5, planetary gears, and a ring gear with an aperture that is axially aligned with the annular channel. A torque frame at least partially supports the gear system. A low pressure turbine with an inlet, an outlet, and a low pressure turbine pressure ratio greater than 5:1.

Abstract: A gas turbine engine includes a bypass flow passage and a core flow passage. The bypass flow passage defines a bypass ratio in a range of approximately 8.5 to 13.5. A fan is located upstream of the bypass flow passage. The bypass flow passage includes an inlet and an outlet that define a design fan pressure ratio of approximately 1.3 to 1.55. A first, inner shaft and a second, outer shaft are concentric. A first turbine is coupled with the first shaft, and the first shaft is coupled with the fan. The fan includes a hub and a row of fan blades that extend from the hub. The row includes a number of the fan blades, the number (N) being 18, a solidity value (R) at tips of the fan blades that is from 1.0 to 1.1, and a ratio of N/R that is from 16.4 to 18.0.

Abstract: A turbine engine is disclosed that includes a fan case surrounding a fan rotatable about an axis. A core is supported relative to the fan case by support structure arranged downstream from the fan. The core includes a core housing having an inlet case arranged to receive airflow from the fan. A compressor case is arranged axially adjacent to the inlet case and surrounds a compressor stage having a rotor blade with a blade trailing edge. The support structure includes a support structure leading edge facing the fan and a support structure trailing edge on a side opposite the support structure leading edge. The support structure trailing edge is arranged axially forward of the blade trailing edge. In one example, a forward attachment extends from the support structure to the inlet case.

Abstract: An aircraft comprising a fuselage and a propulsion assembly, the propulsion assembly comprising at least one fan rotor located at the rear of the fuselage in the extension thereof along a longitudinal axis, and a nacelle forming a fairing of the at least one fan rotor into which a flow of air passes. The aircraft also comprises a plurality of radial stator arms mounted upstream of the at least one fan rotor and extending between the fuselage and the nacelle, the radial arms comprising blowing means configured for blowing, into the environment of a trailing edge of the radial arms, an additional air flow adding to the airflow in the extension of the trailing edge.

Abstract: An aspect includes a system including a high compressor of a gas turbine engine having a ratio of a cold-rotor build clearance to a span between 0.7% and 7%. The cold-rotor build clearance is defined for a plurality of rotor blades of the high compressor with respect to an engine casing assembly interior surface of the high compressor, and the span is defined as a gap between a rotor disk of the high compressor and the engine casing assembly interior surface of the high compressor for at least a last two stages of the high compressor closest to a combustor section of the gas turbine engine. The system also includes at least two bowed rotor management systems for the gas turbine engine to prevent damage to the rotor blades for a bowed rotor condition of the high compressor under a plurality of operating conditions.

Abstract: The present invention relates to a liquid rocket engine using a pump driven by an electric motor, and more particularly, to a liquid rocket engine using a pump driven by an electric motor instead of using a gas generator and a turbine so that a system may be simplified, and an overheated electric motor may be efficiently cooled by circulating a propellant (an oxidant or a fuel).

Abstract: The present invention relates to a liquid rocket engine using a booster pump driven by an electric motor, and more particularly, to a liquid rocket engine using a booster pump driven by an electric motor in which a booster pump is installed between a propellant tank and a propellant pump so that a requirement for an inlet pressure of the propellant pump may be met even in a state in which an internal pressure of the propellant tank is reduced, resulting in reduced amount of a propellant and reduced weight of the propellant tank, and the electric motor configured to drive the booster pump may be efficiently cooled through an oxidant, a cooling line, and the like.

Abstract: The present disclosure provides a variable section nozzle for an aircraft nacelle having a longitudinal axis. The variable section nozzle includes movable doors and at least one displacement device for displacing the movable doors between a reduced section position and a larger position. The movable doors include at least one first guide device and at least one second guide device, each operable to guide the displacement of the doors relative to a fixed structure of the nozzle. The second guide device is disposed downstream relative to the first guide device and each of the first and second guide devices provide a curvilinear path. In one form, the curvilinear paths are substantially circular and define a circular arc.

Abstract: Air pipe for the intake tract of an internal combustion engine, for example a turbo engine, including a first pipe component composed of a first material and a second pipe component composed of a second material, the first material being more flexible than the second material.

Abstract: A quick connect tool is configured to connect male and female ends of a quick connect fuel or oil connector of an automobile. The tool includes a pair of handles pivotally coupled to each other. The tool also includes a pair of arms having pockets configured to receive respective ends of a fuel-line coupling, the arms coupled to the handles via a linkage such that pivotal movement of the handles causes linear movement of the arms to force the ends into engagement. A sensor is configured to output a signal in response to the linear movement exceeding a threshold, indicating that the arms have translated linearly enough to cause a correct and sufficient fitting between the male and female ends.

Abstract: A coalescence element is provided with at least one coalescence medium configured to coalesce water contained in a fluid. The at least one coalescence medium is made of a material with a packing density of at most 10%. The coalescence element is embodied as a single layer formed as a cylindrical jacket and has a fluid path for a fluid between an inlet side and an outlet side of the cylindrical jacket. A filter element with a filter bellows and a support pipe arranged coaxially inside the filter bellows is provided with such coalescence element that is arranged between the filter bellows and the support pipe in the flow direction so as to surround the support pipe at a radial outer side.

Abstract: The present invention includes a bobbin having a winding part around which a coil winding is wound, a terminal extending from the bobbin in the axial direction of the bobbin, and a wrapping part which is provided to the terminal and in which a terminal lead wire pulled out from a coil part that is wound around the winding part is wrapped and fused. The terminal lead wire wired between the bobbin and the wrapping part in a state of being in contact with the surface of the terminal. The peripheries of the bobbin, the wiring part of the terminal lead wire and the wrapping part are covered with resin.

Abstract: Disclosed herein is a mounting structure of a fuel rail, including a mounting boss part having a through-hole formed in a longitudinal direction and a first mating surface formed at an outer surface, an injector cup part provided separately from the mounting boss part and having a second mating surface formed at an outer surface and a flow path hole formed at one side of the second mating surface to be connected to the main pipe for transferring fuel to an injector, and a bridge part connecting the mounting boss part and the injector cup part and having a third mating surface. The mounting structure of the fuel rail can effectively distribute stress concentration by increasing contact area with the main pipe, thereby improving fatigue strength.

Abstract: The invention relates to an electromagnetic switching valve for a fuel-injection system of an internal-combustion engine, which has an actuator region, for moving a closing element, with a pole piece and with an armature and also with a solenoid for generating a magnetic flux in the armature and the pole piece, said armature having a region of magnetic-flux concentration.

Abstract: Apparatus and method for a combustion turbine engine are provided. A pre-mixing passage (24) has an upstream inlet arranged to receive a flow of air to be mixed with fuel. A fuel-injecting lance (12) is disposed in the pre-mixing passage. At least a first fuel ejection orifice (40) is disposed at a first axial location of the fuel-injecting lance. At least a second ejection orifice (42) is disposed at a second axial location of the fuel-injecting lance. A spacing between the first and second axial locations is arranged to effect oscillatory interference patterns in pockets comprising mixtures of air and fuel that flow towards a downstream outlet of the pre-mixing passage. The oscillatory interference patterns may be effective to promote homogeneity in the mixtures of air and fuel and dampen thermoacoustic oscillations in a flame (46) formed upon ignition of the mixtures of air and fuel.

Abstract: The rotation speed and the crank position of an engine in an engine stopping process are detected; then, in the case where when the detected crank position is at an intermediate point between the top death center of any one of the cylinders and the top death center of the cylinder following said one of the cylinders, it is determined that the engine rotation speed is within a predetermined range, drive of the starter is prohibited for a predetermined time period.

Abstract: The invention relates to a method for rotational positioning of a heat engine rotor (3) that is in a stopped position (?A) to a target position (?0), comprising the following steps: a device for detecting the angular position of the rotor (3) determines an angular difference (??) from the target position (?0), a speed set-point (?c(?)) as a function of the angular position (?) of the rotor (3) is established from the angular difference (??), with a rising slope less than a predetermined value (a) followed until a high speed value is reached less than a predetermined value (?0), and a falling slope less than a predetermined value (b), the rotor (3) is set in motion following the speed set-point (?c(?)).

Abstract: An engine control device includes an electronic control unit. The electronic control unit is configured to perform a spark discharge with an ignition plug for each cylinder by cutting off energization after elapse of a predetermined period from start of energization to an ignition coil for each cylinder of the engine, to stop the spark discharge caused by the ignition plug for each cylinder after supply of fuel to the engine is stopped when operation of the engine is stopped, and to control an ignition plug so as to stop the spark discharge caused by the ignition plug from a cylinder after a rotation speed of a crankshaft decreases gradually and the rotation speed of the crankshaft reaches a preset threshold value or less, after the stop of the supply of fuel to the engine.

Abstract: An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.

Abstract: A wave energy conversion cylinder includes an outer cylinder and a center rod disposed along an axis of the outer cylinder. A plurality of electrically-conductive windings are disposed about an inner circumference of the outer cylinder. A magnet is slidably disposed on the center rod. A buoyancy cylinder is disposed outwardly of the outer cylinder. A first moveable ring weight may be slidably disposed along the axis of the center rod and a second moveable ring weight may be slidably disposed along the axis of the center rod. The first moveable ring weight and the second moveable ring weight facilitate control to tune a mass moment of inertia of the wave energy conversion cylinder.

Abstract: An apparatus for transporting water is described. The apparatus includes a large number of identical units that contain fresh water, for example, and which float on the sea. The units are alternately controlled to rise and fall with a first tide and to remain at low tide during the next tide. This motion, along with valves to allow fresh water to flow in one direction only, provide a water transport system that operates using tidal power.

Abstract: The present invention relates to a device which applies work to the outside with environmental thermal energy, including a positive feedback heat pump system and a reciprocating multi-stage heat exchange working system. A high temperature heat source and a low temperature heat source are produced using a positive feedback heat pump, and at the same time the reciprocating multistage heat exchange working device applies work with heat energy and cold energy. As we can get several times of heat energy and cold energy when a certain amount of electric energy is consumed by a heat pump, and the thermal efficiency of the reciprocating multistage heat exchange working system is 100% theoretically, so we can get several times of electric energy. That is to say, its output is much bigger than its input, and the device can run without electric energy input, and provide electric energy to the outside.

Abstract: A fluid turbine comprises a rotor rotatable in use about an axis transverse to the direction of fluid flow, the rotor having a first part carrying a plurality of arcuate blades that may be arranged selectably in compact straight shapes or in arcuate shapes and a second part journalled in a base structure by two or more bearings.

Abstract: A wind turbine blade (10) for a horizontal axis wind turbine (2), wherein the wind turbine blade (10) extends in a longitudinal direction parallel to a longitudinal axis and having a tip end (14) and a root end (16), and wherein the wind turbine blade (2) further comprises a shell body is disclosed. The wind turbine blade (10) further comprises a root end flange (55, 155, 255) at the root end (16) of the blade (10) and which comprises a ring-shaped body that extends circumferentially along the entire root end (16), the root end flange (55, 155, 255) preferably made from a metal, such as stainless steel. The root end flange (55, 155, 255) comprises an inwardly extending protrusion (70, 170) with a distal plate part (72, 172, 272, 372, 472, 572, 672, 772) arranged in a distance from the ring body.

Abstract: The invention relates to a wind turbine blade having integrated thermoplastic anchoring sites for attachment of surface mounted devices, a method for producing such blade and a wind turbine equipped with such blade.

Abstract: A system can include a data server that calculates a risk level of each of a plurality of wind turbines at a turbine site based at least in part on a base risk level and mortality data that characterizes a mortality of a volant animal caused by a given wind turbine of the plurality of wind turbines. The system can also include a turbine monitor server that stores the risk level of each wind turbine in a database and generates a graphical dashboard based on data in the database. The system can further include a turbine site control server that retrieves data from the database and sets cut-in speed of each of the plurality of wind turbines based on the data retrieved from the database.

Abstract: A wind turbine power generation facility includes: at least one wind turbine power generating apparatus; a lightning sensor for detecting or predicting occurrence of lightning in an installation area of the at least one wind turbine power generating apparatus; and a controller for switching an operation mode of the at least one wind turbine power generating apparatus to a lightning-protection mode in which a rotor rotation speed is lower than a rated rotation speed, on the basis of an output signal of the lightning sensor.

Abstract: The present disclosure generally relates to methods and systems for controlling the output frequency of a wind farm by providing instructions for adjusting wind farm output frequency from a frequency controller to an Active Power (AP) Controller in an existing SCADA system. More specifically, the method generally includes receiving frequency data of a plurality of wind turbines collected at a Point of Interconnection (POI) of a wind farm, calculating an error value based on a comparison of the frequency data to a predetermined frequency set point, determining whether to increase, decrease, or not affect an output frequency of the wind farm based on analysis of the calculated error value, and transmitting to an AP controller the determination whether to increase, decrease, or not affect the output frequency.

Abstract: The present disclosure is directed to a method for determining an estimated rotor shaft position of a rotor shaft of a wind turbine. The method includes generating, with a rotor shaft position sensor, a measured rotor shaft position signal associated with a measured rotor shaft position of the rotor shaft. The method also includes generating, with a plurality of accelerometers positioned in an axisymmetric arrangement, a plurality of rotor hub acceleration signals associated with a plurality of rotor hub accelerations of a rotor hub coupled to the rotor shaft. The method further includes determining, with a controller, a phase adjustment based on one of the plurality of rotor hub acceleration signals or a predetermined correction value. Furthermore, the method includes adjusting, with the controller, the measured rotor shaft position by the phase adjustment to determine the estimated rotor shaft position of the rotor.

Abstract: A method of detecting a damage of a wind turbine blade of a wind turbine rotor includes: a light input step of inputting light into a fiber-optic sensor mounted to the wind turbine blade; a light detection step of detecting reflection light from the grating portion; an obtaining step of obtaining a wavelength fluctuation index representing a fluctuation amount of a wavelength of the reflection light detected in the light detection step; and a detection step. The detection step includes detecting the presence or the absence of the damage of the wind turbine blade based on the wavelength fluctuation index taking account of a correlation between the wavelength fluctuation index of the wind turbine blade and a load index related to a load applied to the wind turbine blade, or a correlation between the wavelength fluctuation index and a temperature index related to a temperature of the wind turbine blade.