Abstract: An apparatus correcting a bias of a gyroscope that is mounted on a mobile robot and that measures an angular velocity of the mobile robot. The apparatus includes: at least one encoder respectively measuring a traveling velocity of a respective at least one wheel of the mobile robot; a modeling unit calculating an angular velocity of the mobile robot by using the measured traveling velocity; a bias presuming unit determining a confidence range by using difference values between the calculated angular velocity and the measured angular velocity, and calculating a presumed bias by using a value in a confidence range among the difference values; and a bias removing unit removing the presumed bias from the measured angular velocity.

Abstract: Method and apparatus for monitoring the rotational speed of a shaft, in particular a shaft having a number of spaced features on or rotating with the shaft. Preferred embodiments of the invention are concerned with methods and apparatuses for processing signals in order to calculate, with high accuracy and a fast response time, the rotational speed of a gas turbine shaft. The invention recognizes that it is possible to accurately measure speed between two eddy current sensors (5, 6) by determining the time take for a turbine blade to pass therebetween provided that appropriate compensation is made for the effect of apparent changes in the magnetic distance between the sensors.

Abstract: A rotation speed measuring device includes a position sensor outputting position signals indicating M (M >2) rotation positions of equal phase difference per rotation of the rotating equipment, a clock signal generator generating a clock signal; a counter counting the pulses of the clock signal; a measuring interval setting unit setting a duration coefficient indicating the ratio of a measuring interval during which the number of pulses is to be counted within a time period between two successively occurring position signals, to the entire time period between the two position signals; and causing the counter to count the number of pulses during the measuring interval; and a calculating unit calculating the rotation speed of the rotating equipment as a function of the frequency of the basic clock signal, the integer M, the duration coefficient, and the count value obtained by the counter.

Abstract: The present invention is related to a method for determining a characteristic curve (9) for an electric variable (Pel, Q, ?, cos ?, IP, IQ) of a wind energy plant (1). According to the present invention, it is provided that at least one characteristic value of the electric variable (Pel, Q, ?, cos ?, IP, IQ) is measured for at least one value of the wind (vW), and for the at least one value of the wind (vW), a characteristic value of the electric variable (Pel, Q, ?, cos ?, IP, IQ) is adapted from a predetermined characteristic curve (7) containing characteristic values of the electric variable (Pel, Q, ?, cos ?, IP, IQ) as a function of different values of the wind (vW), taking into account the characteristic value measured for the at least one value of the wind (vW).

Abstract: A testing method for a fan module is provided. When the fan module is tested, a testing computer sends a testing command to a testing device first. Then, the testing device respond to the testing command and controls the fan module to work in a plurality of rotational speed modes in sequence. The testing device reads an actual rotational speed when the fan module works in one of the rotational speed modes and sends the actual rotational speed back to the testing computer. The testing computer compares the actual rotational speed with a corresponding reference rotational speed value stored in the testing computer, and determines the testing result. Finally, the testing result is shown.

Abstract: A method and apparatus for detecting forward/reverse speeds of a continuously variable transmission for vehicles determines whether a vehicle is in a forward speed state or in a reverse speed state by using one speed detector having two sensors. The method for detecting forward/reverse speeds of the continuously variable transmission for vehicles includes detecting first and second rotational speeds of an output shaft modulating the first and second rotational speeds of the output shaft into a pulse width modulation signal, comparing the pulse width of the pulse width modulation signal with predetermined values, and determining whether a vehicle is in a forward speed state or in a reverse speed state.

Abstract: It is possible to provide a technique for accurately performing an operation desired by a user. A user's head operation is identified according to information detected by a head motion detection unit. A process desired by the user is executed according to an angular velocity of the head motion. Moreover, the technique uses a control unit which can accurately execute an operation by the user's head operation without reflecting the return motion of the user's head in the process. The control unit executes a process for a start and an end of each process corresponding to the detected angular velocity according to a predetermined threshold value.

Abstract: An operating method for a Coriolis gyro. Digital read signals are produced that represent a measure of the instantaneous amplitudes/frequencies of the stimulation oscillation/read oscillation of the gyro resonator. Force signals are applied to the resonator. The force signals are controlled as a function of the digital read signals so that the stimulation oscillation/read oscillation assume specific amplitudes/frequencies. The force signals are produced from quantized output signals from a pulse modulator. The modulator is fed with digital stimulation/compensation signals derived from the digital read signals.

Abstract: A method for determining two pseudo-sinusoidal signals in quadrature from a pseudo-sinusoidal signal transmitted by an encoder is provided. The method using a sensor arranged within reading distance of the encoder, which sensor includes at least four sensing elements which are linearly equally distributed. The sensing elements are each capable of delivering a signal Si representative of the signal transmitted by the encoder. The method measuring the signals Si and combining the signals Si in order to form the signals U=(S1?S2)?(S3?S4) and V=(S2?S3), which signals U and V are in quadrature. A system for determining by implementing such a method, as well as a bearing including such a determination system, are provided.

Abstract: A method and system for relieving forging induced residual stresses in a rotor forging balances a pre-spin machine with the forging mounted thereon at a first rotational speed and then pre-spins the forging with it mounted on the machine at a substantially greater second rotational speed. A one per rev sensor is used for determining a weight placement angle and a vibration sensor is used for determining an amount of weight to add to a spinning assembly including the forging during the balancing. High-density non-metallic balance weights adhesively attached on an inside surface of the forging or spinning assembly may be used. The rotational inertia of the spinning assembly may be checked during a spin up period by determining a rate of rotational acceleration vs. torque applied to the spinning assembly and used to stop the pre-spinning if it is to great.

Abstract: A chamber monitoring system may include a parallel architecture in which a single sensor control system is coupled to a number of different processing chamber control board sensor lines. In an illustrative embodiment, a single rotation sensor such as a tachometer may reside in a central control unit remote from the processing chambers such that rotation data may be processed by a single system and thereafter routed according to a variety of different network communication protocols to the main system controller, a factory interface, or both. In this and other embodiments, pull-up networks in the central control unit and the chamber control boards are matched so as to reduce electrical signal anomalies such as crowbar effects. The central control unit may be programmed via a main system controller to operate according to user defined parameters, which in turn may enable the system to differentiate between certain operating states.

Abstract: A measurement system is provided for measuring parameters of a motion system. The measurement system includes a sensor for sensing the passing of a magnetic field as the source of the magnetic field passes the sensor; a processor for processing a signal generated by the sensor; a calculator for calculating various performance parameters of the motion system; and an output portion for sending the various parameters to a down stream system.

Abstract: A device for measuring angular velocity of a rotating tire, comprising a plurality (“m” pieces) of light reflection marks (3) disposed on an outer surface of a sidewall portion (2s) of a tire (2) so as to be located on a circumference line (j) of a single circle centered on a tire axis (i), a light sensor (5) fixed to a vehicle body (4) and capable of detecting passing of the light reflection marks (3) rotating with the tire (2), and a calculation means (7) for calculating the angular velocity Vr of the tire (2) by detecting passing of the light reflection marks (3) with the light sensor (5).

Abstract: A method is provided for analyzing vibrations of a variable speed rotating body. The method includes producing a signal that is proportional to an acceleration of the rotating body and producing a plurality of pulses. Each pulse represents a revolution of the rotating body and is indicative of a vibration sample at a rotational position of the rotating body. The signal is converted to a numeric value that is indicative of a vibrational amplitude of the rotating body. The plurality of pulses are converted to revolution time periods indicative of a rotational rate of the rotating body. The method also includes producing a harmonic vibrational amplitude at a harmonic of the rotational rate of the rotating body, and representing a phase of the harmonic vibrational amplitude relative to the rotational position of the rotating body.

Abstract: Modem rotary machine production requires built-in fault detection and diagnoses. The occurrence of faults, e.g. increased friction or loose bonds has to be detected as early as possible. Theses faults generate a nonlinear behavior. Therefore, a method for fault detection and diagnosis of a rotary machine is presented. Based on a rotor system model for the faulty and un-faulty case, subspace-based identification methods are used to compute singular values that are used as features for fault detection. The method is tested on an industrial rotor balancing machine.

Abstract: A gyroscope for determining an angular rate output. The gyroscope includes a first demodulator configured to demodulate an angular rate measurement at a first bias modulation frequency to determine the angular rate signal and a second demodulator configured to demodulate the angular rate measurement at a second bias modulation frequency to provide a signal with ARW information. The gyroscope further includes an ARW estimator that provides an output that is proportional to ARW that is then stored in a memory. The second bias modulation frequency is an even order harmonic of the first bias modulation frequency.

Abstract: An angular velocity detecting apparatus including one synchronous detection unit alternately detecting synchronously a displacement signal from a vibrating body with a plurality of synchronous detection signals; one integral calculation unit alternately carrying out integral calculations of a plurality of outputs of the synchronous detection unit; a unit alternately multiplying a plurality of AC signals with two outputs obtained with the synchronous detection unit; a unit adding the two multiplied outputs; and a unit feeding back the output of the addition unit to vibrating body.

Abstract: An angular velocity detected by an angular velocity sensor (10) is integrated by a small angle matrix calculator (12) and a matrix adding calculator (14), and then restored as a posture angle (angular velocity posture angle) by a matrix posture angle calculator (16). A posture matrix is calculated by a tilt angle calculator (22) and an acceleration matrix calculator (24) and an acceleration detected by an acceleration sensor (20) is restored as a posture angle (acceleration posture angle) by a matrix posture angle calculator (26). Low pass filters (18, 28) each extract a low range component, the difference between the two is calculated by a differencer (30), and only the drift amount is extracted. A subtracter (32) removes the drift amount from the angular velocity posture angle and the result is output from an output device (34). In addition, a posture angle matrix calculator (36) converts the result to a posture matrix, which it feeds back to the matrix adding calculator (14).

Abstract: The present invention relates to an automatic inter-axle differential sensor configuration (i.e., location) and calibration method for a vehicle having a tandem drive axle. The method involves determining the speed of the vehicle, determining pulses per minute from each inter-axle differential sensor via the vehicle electronic control unit (ECU), where each of the inter-axle differential sensors are connected to an inter-axle differential gear, determining a location of each inter-axle differential sensor from each of the inter-axle differential sensor pulses per minute, and assigning a number of teeth to each of the inter-axle differential gears in calibrating each of the inter-axle differential sensors. The revolutions per minute for each of the inter-axle differential sensors may be utilized to lock the inter-axle differential during slippage of the vehicle, without human intervention.

Abstract: A method of identifying a faulty vehicle speed sensor on a vehicle comprises the steps of determining whether or not a wheel of a vehicle is rotating using an alternative sensor attached to that wheel, and in the event that the alternative sensor indicates that the wheel is rotating and the speed sensor does not, indicating that the speed sensor is faulty, in which the alternative sensor comprises at least one pressure sensor associated with a tyre of the vehicle.

Abstract: An improved keyboard system and apparatus using keys spaced and sized to correspond to human hands provides rapid data entry applicable to all electronic devices. Each key combination provides a binary sequence, and each sequence is associated with an alphabetic, numeric or control character using standard ASCII coding. The preferred eight key embodiment is adapted to the back of a hand-held electronic device whereby data is readily input by a user holding the device with both hands.

Abstract: A motor control system and method are provided for detecting current ripple in a commutated DC motor and further determining position and speed of the motor based on the detected ripple current. Ripples in the motor current are detected and a ripple frequency is calculated based on the time between successive ripples. A ripple count between successive frequencies is determined and the ripple count is compared to a threshold value, and an estimated ripple frequency is determined from a motor model when the ripple count exceeds the threshold value. A corrected ripple count is calculated from a ratio of the calculated ripple frequency and the estimated ripple frequency, and motor position and motor speed are determined based on the corrected ripple count.

Abstract: A method for determining a critical reduction in shaft speed in a work machine having at least one monitored shaft driven by a crankshaft of an engine includes determining an actual rotational speed of the crankshaft; determining an actual rotational speed of a first monitored shaft; determining a filtered rotational speed of the first monitored shaft based on an algorithm that utilizes the actual rotational speed of the first monitored shaft, the actual rotational speed of the crankshaft, and a reference rotational speed of the crankshaft; comparing the filtered rotational speed to the actual rotational speed of the first monitored shaft; determining whether the actual rotational speed of the first monitored shaft deviates from the filtered rotational speed by a predetermined amount; and activating an alarm if the actual rotational speed of the first monitored shaft deviates from the filtered rotational speed by the predetermined amount.

Abstract: The present invention is a system for determining vehicle speed. The system has a sensor mounted on a wheel rotatably mounted on the vehicle for sensing centripetal acceleration of said wheel. The sensor generates a signal indicative of the sensed centripetal acceleration, and is arranged to wirelessly transmit the signal. The system additionally has an electronic control unit mounted on the vehicle. The electronic control unit is arranged to receive the signal and determine the speed of the vehicle based on the sensed centripetal acceleration.

Abstract: A game apparatus calculates a gravitational vector Vg, which represents a gravitational direction viewed from an input device, based on operation data. Then, a motion acceleration vector VA, which represents an acceleration applied by a motion of the input device, is calculated based on an acceleration represented by acceleration data and the gravitational vector Vg. The gravitational vector Vg is corrected such that the motion acceleration vector VA approaches a motion acceleration (vector VA?) satisfying a relationship with an angular rate (vector V?) represented by angular rate data, the relationship being predefined between the motion acceleration and the angular rate for the input device making a predetermined motion (rotational motion). Furthermore, the game apparatus calculates an orientation of the input device corresponding to the corrected gravitational vector.

Abstract: An inertial measurement unit includes a base having a plurality of physically distinct sectors, upon which are positioned thereon three groups of orthogonally oriented angle rate sensors, each group positioned on a different sector of the base. Three high-G orthogonally oriented accelerometers are also positioned on the base, as well as three low-G orthogonally oriented accelerometers. A processor is positioned on the base having software resident thereon for receiving signals from the three groups of angle rate sensors and the three high-G and three low-G accelerometers. Software is also resident on the processor for calculating from the received signals one or more of the following: a change in attitude, a change in position, a change in angular rate, a change in velocity, and a change in acceleration of the unit over a plurality of finite time increments. Preferably, each gyro is subjected to oversampling, temperature and bias compensation, and bias offset compensation.

Abstract: A tunnel boring machine (90) having a rotating cutter head (93) that rotatably supports a plurality of cutter assemblies (10). A plurality of instrument packages (50) are attached to the rotating cutter head, each instrument package having a distal end in contact with an associated cutter assembly. The instrument packages include a plurality of sensors including an accelerometer (32), magnetometer (33) and temperature sensor (34), for monitoring the associated cutter assembly. The sensors are mounted in a distal end of the instrument packages that is biased to remain in contact with the cutter assembly. The instrument packages include a wireless transmitter, and they are interconnected in a mesh or peer to peer network. A power supply (176) such as a battery pack is provided for each instrument package. The data from the sensors may be used to control operation of the tunnel boring machine and/or to monitor the condition of the cutter assemblies.

Abstract: A rotating machine, has a rotary component, which includes a memory device for storing data relating to the past use of the component. The data are associated with rotational speed and ambient temperature, which are detected by detectors either on or off the rotary component. The stored data may be the raw temperature and speed data as sampled over time, which are then used to derive values of low-cycle fatigue and creep damage. These fatigue and creep values are, in turn, correlated with the load profiles of the component to arrive at a value of elapsed lifespan for the component. Alternatively, the stored data may be the fatigue and creep values and/or, preferably, values of elapsed and remaining lifespan of the component. In a second embodiment the detectors are located on the machine casing along with an evaluation unit.

Abstract: The present invention relates to a method for determining the rotational speed of the main shaft (3) of a transmission in which the main shaft (3) is connected to an output shaft (4) via a shiftable planetary gear (17), whereby the main shaft (3) is connected in a rotationally fixed manner to the sun gear (18) and the output shaft (4) is connected in a rotationally fixed manner to the planet carrier (20). The steps of the method are picking up the rotational speed (nHohlrad) of the ring gear (22), picking up the rotational speed (nAbtrieb) of the output shaft or the planet carrier (20), and computing the rotational speed (nHauptwelle) of the main shaft (3) from the rotational speed (nHohlrad) of the ring gear and the rotational speed (nAbtrieb) of the output shaft or the planet carrier (20). The present invention further relates to a transmission having a rotational speed pickup device.

Abstract: A system and method for controlling the speed of a recirculation pump in an anode recirculation loop of a fuel cell system based on a predetermined ratio of fresh hydrogen to recirculated anode gas. The system uses a model to determine the volume flow of the recirculated gas through a fuel cell stack to determine the recirculation rate based on a measured temperature of the recirculated gas, a measured pressure drop across a recirculation pump, a pressure drop across the anode inlet and outlet of the stack, a percentage of hydrogen in the recirculated gas, and the density of the recirculated gas.

Abstract: A method and system, according to one embodiment of the present invention, provide a means to accurately determine the velocity of a vehicle. An initial estimation of the velocity of the vehicle is calculated based on rates of rotation of a plurality of wheels on the vehicles. If any of the wheels on the vehicle are in a brake control, or traction control, situation, the initial estimation is modified based on an acceleration of the vehicle to generate a modified estimation of the velocity of the vehicle.

Abstract: An example geolocation system for mounting on a mammal incorporates simple sensing sleeves on the calves of the body support members, combined with an accelerometer based gravity direction and force sensing at the center of mass of the body. The example system is connected to a digital processing unit and a battery power supply to integrate the sensing to determine kinetic and potential energy of the body locomotion over time in a method that integrates out the aperiodic motion of the body about the center of mass, and uses the residual motion to measure the center of mass locomotion from a known point.

Abstract: Determining performance of an internal combustion engine coupled to a pump of a torque converter may include determining a rotational speed of the pump, determining a rotational speed of a turbine fluidly coupled to the pump, determining an engine output torque value, corresponding to torque applied by the engine to the pump of the torque converter, as a function of the rotational speed of the pump and the rotational speed of the turbine, and storing the engine output torque value in a memory unit. Alternatively or additionally, engine horsepower may be determined as a function of the engine torque and/or a fuel efficiency of the engine may be determined as a function of the horsepower and fueling rate of the engine. The engine output torque value, horsepower value and/or fuel efficiency may be stored in a memory unit and/or displayed on a display unit.

Abstract: A motor control system and method are provided for detecting current ripple in a commutated DC motor and further determining position and speed of the motor based on the detected ripple current. Ripples in the motor current are detected and a ripple frequency is calculated based on the time between successive ripples. A ripple count between successive frequencies is determined and the ripple count is compared to a threshold value, and an estimated ripple frequency is determined from a motor model when the ripple count exceeds the threshold value. A corrected ripple count is calculated from a ratio of the calculated ripple frequency and the estimated ripple frequency, and motor position and motor speed are determined based on the corrected ripple count.

Abstract: There is disclosed a fuel property detector for detecting a property of fuel injected by a fuel injector into a cylinder of an internal combustion engine. The fuel property detector includes an injection commander, a change detector, and a fuel property determiner. The injection commander commands the fuel injector to perform a fuel injection for fuel property detection into the cylinder of the engine. The change detector detects a change in the rotational speed of the engine which is caused by the fuel injection for fuel property detection. The fuel property determiner determines the property of the fuel based on the change in the rotational speed of the engine detected by the change detector.

Abstract: Method and apparatus for monitoring the rotational speed of a shaft, in particular a shaft having a number of spaced features on or rotating with the shaft. Preferred embodiments of the invention are concerned with methods and apparatuses for processing signals in order to calculate, with high accuracy and a fast response time, the rotational speed of a gas turbine shaft. The invention recognises that it is possible to accurately measure speed between two eddy current sensors (5, 6) by determining the time take for a turbine blade to pass therebetween provided that appropriate compensation is made for the effect of apparent changes in the magnetic distance between the sensors.

Abstract: A method (and corresponding apparatus) for monitoring the rotational speed of the shaft of a gas turbine having a number of spaced blades on or rotating with the shaft. The invention compensates for the errors which arise from the relative movement of turbine blade tips by deriving a correction factor for each blade and continually updating that correction factor.

Abstract: The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.

Abstract: The invention relates to a method for establishing the position of an actuating unit which is operated by an electric motor, in which a motor speed is determined from a motor model, the speed is integrated over a period of time and the position of the actuating unit is determined by multiplying the result of the integration by a proportionality factor. The motor model takes account of afterrunning of the electric motor at the instant of switch-off. The invention also relates to actuating units, brakes, pumps and transmissions for which the method can be used.

Abstract: A method automatically sets initially-estimated rotational frequency for a motor frequency measuring system based on pulse signals output from an encoder. Initially, a counter is reset to zero, and a count threshold and an initially-estimated rotational frequency are set. The possible motor frequencies are divided into multiple frequency ranges with specific starting frequencies. A pulse width threshold is set according to the initially-estimated rotational frequency. A new motor frequency is calculated by the count threshold and a corresponding elapsed time. The initially-estimated rotational frequency is set to be a frequency in a frequency range higher than the new motor frequency. Therefore, the initially-estimated rotational frequency can be adaptively set according to an updated frequency measurement. Moreover, the count threshold can be monotonously increased with the updated frequency measurement to enhance measurement accuracy.

Abstract: An estimation method of the crank angle at which 50% of the fuel mass has been burnt in a cylinder of an internal combustion engine with spontaneous ignition of the mixture provided with a drive shaft coupled to a phonic wheel presenting a number N of teeth; the method contemplates the steps of: reading the passage of each tooth of the phonic wheel in front of a sensor; determining the angular speed of the drive shaft at each tooth event of the phonic wheel; determining at least one harmonic of the speed signal; determining an inverse mechanical model of the transmission; determining at least one torque harmonic by applying the inverse mechanical model to the speed signal harmonic; determining an algebraic function which puts a combustion index into relation with the phase of the nth torque harmonic; and determining the combustion index by applying the algebraic function to the nth torque harmonic.

Abstract: A method of calibrating once-around and harmonic errors of encoded nips is provided. An encoder with an index pulse is used to measure the velocity and rotation of the driven wheel or idler. The geometry of the drive train and wheel and idler is chosen so that their once around and harmonic frequencies are unique such that no other drive errors will generate these frequencies. The method includes running the idler or wheel at substantially constant velocity for N revolutions. Each index triggers the collection of velocity data, which is averaged for N revolutions. This process detects drive train motion errors that are periodic with respect to the timing of the index pulse (i.e., once per revolution of the wheel or idler). Once the velocity errors have been measured, corrections are made. This method may be incorporated in xerographic machines as part of a setup or calibration procedure.

Abstract: The invention relates to a device for determining a rotational speed about the vertical axis of a vehicle, comprising a rotational speed sensor which outputs a signal which is dependent on the rotational speed about the vertical axis, and a signal evaluation means which determines the rotational speed from the signal supplied by the rotational speed sensor. According to the invention, a radiation sensor is provided for sensing an angle of a preceding vehicle located in the region ahead of the vehicle relative to the vehicle, the data from the radiation sensor being supplied to the signal evaluation means in order to sense the angle and being taken into account in the compensation of the offset error of the rotational speed sensor.

Abstract: A signal-processing circuit for a dual-axis vibratory rotation-rate sensor has a digitally programmable bandwidth. An analog-to-digital converter (ADC) converts analog sense signals to digital signals at a high sampling rate. The results of successive ADC conversions are accumulated for a user-programmable number of conversions. By accumulating a number of samples, the sense signals are averaged which improves the signal-to-noise ratio and smoothes the output signal. Alternatively, accumulating a smaller number of samples allows the user to improve the response time of the sensor, allowing the user to set the number of samples that are averaged enables the user to control the effective bandwidth of the sensor. The accumulated conversions are also are scaled by unit-specific calibration factors in order to accommodate for unit to unit variations, so that the rate output will be consistent across a number of sensors.

Abstract: A system and method for nonintrusively determining electric motor efficiency includes a processor programmed to, while the motor is in operation, determine a plurality of stator input currents, electrical input data, a rotor speed, a value of stator resistance, and an efficiency of the motor based on the determined rotor speed, the value of stator resistance, the plurality of stator input currents, and the electrical input data. The determination of the rotor speed is based on one of the input power and the plurality of stator input currents. The determination of the value of the stator resistance is based on at least one of a horsepower rating and a combination of the plurality of stator input currents and the electrical input data. The electrical input data includes at least one of an input power and a plurality of stator input voltages.

Abstract: A method for measuring movement of a solid, using an absolute measurement associated with a double integration measurement. The method can be applied in particular to sensing movements of the human body and includes a series of measurement of the acceleration of the solid and double integration of the measurements to obtain successive values of a first translation of the solid, and a series of absolute measurements of at least one second degree of freedom of the solid, namely a rotation, and this measurement of rotation is converted into a measurement of translation used to update the first translation.

Abstract: A multiple-point smoothing method for motor-speed estimation. The output of an encoder is over-sampled to obtain over-sampled position differences according to an over-sampling factor M. The over-sampled position differences are averaged to obtain an initial speed estimation. The initial speed estimation is low-pass filtered to obtain a final speed estimation. The final speed estimation is sent to a speed controller to control the speed of a motor. Alternatively, in a composite multiple-point smoothing scheme, the initial speed estimations based on two over-sampling factors are obtained. One of the initial speed estimations is selected based on an average of the two estimations, and the selected initial speed estimation is further processed to obtain a final speed estimation. The method of the present invention can reduce ripple in estimated speed of motor when the motor is operated at high speed.

Abstract: A crank angle sensor outputs a pulse signal whenever a crankshaft rotates a predetermined angle. An ECU performs an elimination process on a sequence of pulse signals to obtain a remaining signal used to determine the crank angle. When the rotation speed of the crankshaft becomes lower than a predetermined threshold, the ECU suspends the elimination process and determines the crank angle using pulse signals that have not undergone the elimination process. The ECU detects reverse rotation of the crankshaft based on pulse signals that have not undergone the elimination process. A crank counter is operated in synchronism with the falling of a pulse signal when the crankshaft rotates in the forward direction and is operated in synchronism with the rising of a pulse signal when the crankshaft rotates in the reverse direction.

Abstract: An ECU executes a program that includes the steps of setting a vehicle speed to the minimum wheel speed among wheel speeds of four wheels of a vehicle; calculating a difference between the wheel speeds of right and left driven wheels; turning an abnormality flag on when a higher wheel speed is higher than a value obtained by multiplaying a lower wheel speed by ?; and determining that the vehicle is turning, and turning a turning flag on, when the abnormality flag is off, a predetermined time has not elapsed after the turning flag is turned on, and the difference between the wheel speeds is equal to or larger than a map value obtained using a map where a vehicle speed is used as a parameter.

Abstract: A monitoring system for a machine is provided. The machine includes at least one movable member including at least one sensor configured to generate at least one speed measurement of the moveable member. The machine also includes at least one processor coupled in electronic data communication to the sensor. The sensor is configured to generate at least one time stamp value for the at least one speed measurement signal. The at least one processor is configured to generate a plurality of time-stamped speed measurement signals of the at least one moveable member. The processor is further configured to determine a prioritization of the plurality of time-stamped speed measurement signals as a function of at least one predetermined temporal value.