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7549916 |
Cabin pressure control system and method that implements high-speed sampling and averaging techniques to compute cabin pressure rate of change
An aircraft cabin pressure control system and the method implement a technique that oversamples and filters a sensed cabin pressure signal, and then differentiates the oversampled and filtered...
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7541951 |
Tracking loop type digital angle converter and angle/digital converting apparatus
A tracking loop type digital angle converter that operates so that a deviation between input and output angles always becomes zero by feeding back the output angle to the input angle, wherein in...
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7538700 |
Angular position detector and rotary electric device drive unit including the same
The invention provides an angular position detector that can be configured at low cost and that accurately detects the angular position of a rotor in a rotary electric device and permits reliable...
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7535382 |
High speed quadrature counter
A high speed quadrature counter for use with a displacement measuring device is disclosed. The counter provides high speed counting by partitioning the tracking counter into a small fast tracking...
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7535982 |
Method and apparatus for adjusting phase of sampling frequency of ADC
A method for adjusting a phase of a sampling frequency of ADC is disclosed. The method includes converting an analog signal into a first digital signal according to a first phase of the sampling...
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7496462 |
Encoding signal processing device and signal processing method therefor
An encoder signal processing device comprising an A/D converter converting a periodic analog signal, a memory storing position detection error information and a computing unit including a position...
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7489260 |
Resolver hall decoding circuit
A device for converting position data to Hall code data includes a data input for providing the position data, a data output for providing the Hall code data, a first adder circuit operative to...
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7456603 |
Phase detection circuit, resolver/digital converter using the circuit, and control system using the converter
A small-sized and low-cost phase detection circuit which has improved noise immunity. The phase detection circuit comprises a multiplier for multiplying an input signal by a reference signal and...
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7432836 |
Multiplexed signal conditioner
A signal conditioning circuit time share multiplexes anti-aliasing filters and an A/D converter. A plurality of first tier multiplexers each time share multiplex one of a plurality of antialiasing...
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7417571 |
Method for providing a correlation
A method for providing a correlation between a periodic analog/digital conversion and an angle-synchronous signal, in which the periodic analog/digital conversion is provided with a timing mark,...
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7382295 |
Control unit for electric power steering apparatus
Since an abnormality is judged by executing a square calculating process with respect to sin θ and cos θ for detecting an abnormality in an angular resolver, a processing time is elongated, and a...
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7352305 |
Method and circuit for interpolating encoder output
Two-phase sinusoidal signals QA, QB output from an encoder are interpolated by sample-and-hold (S/H) circuits and A/D conversion (ADC) circuits, and data D is output in accordance with a data...
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7352304 |
Interpolation apparatus in encoder
An interpolation apparatus in an encoder includes an analog-to-digital converter for digitizing a sine wave signal and a cosine wave signal, respectively. An amplitude level detecting circuit...
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7321113 |
Precision material-handling robot employing high-resolution, compact absolute encoder
An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The...
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7253395 |
Absolute encoder employing concatenated, multi-bit, interpolated sub-encoders
An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The...
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7205916 |
Digital method and apparatus for resolving shaft position
An apparatus and method for determining an angular position of a shaft are disclosed, which comprise resolving an excitation signal at an excitation frequency into at least two orthogonal signals,...
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7199727 |
Electrostatic encoder and electrostatic displacement measuring method
An electrostatic encoder comprises a movable element having electrodes and a stator having induction electrodes and potential detection electrodes. The electrostatic encoder further comprises a...
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7196643 |
Resolver arrangement
A resolver arrangement that is inexpensive and yet offers high resolution and high noise rejection includes a carrier signal generator and two processing channels each of which has an analog input...
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7194394 |
Method and apparatus for detecting and correcting inaccuracies in curve-fitted models
A technique for detecting and correcting inaccuracies in curve-fitted models. Humps and dips in a curve-fitted model are identified. An analysis is performed on the humps and dips to determine if...
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7187309 |
Angle computation method and apparatus for variable reluctance resolver
In an angle computation method and apparatus for a variable reluctance resolver, the maximum values V sin (max) and V cos (max) of sine and cosine output voltages in respective positive value...
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7126514 |
Inverter control device and inverter control method
An inverter control microcomputer 10 comprises AD converters 21–23 , a selector control circuit 31 , and a selector 32 . The selector 32 selects three analog signals from among inputted...
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7119717 |
Encoder output divider and R/D converter
A Resolver/Digital (R/D) converter includes an encoder output divider having a DSP generating 14-bit encoded signals A 2 and B 2 from a timing analysis performed during the first period of 12-bit...
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7064692 |
Solid-state synchro/resolver converter
Methods and systems for simply and inexpensive converting the signals of solid-state sensors for use by analog systems and indicators. An embodiment of the system receives a DC voltage value from...
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7047145 |
Compensation method of resolver detected position
A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was...
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7046176 |
Rotary encoder
A rotary type encoder is provided with a signal generating portion 2 for generating a sine wave signal of N periods for each revolution in accordance with the rotation of the shaft 4 of a...
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7015840 |
Resolver/digital converter
An R/D converter allows high precision detection of a rotation angle of a rotor axis of a resolver having high rates of rotation. An A/D converter is built into a digital signal processor and...
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7012397 |
Encoder and control apparatus for motor
In a control apparatus, a “characteristic value calculation” block calculates a characteristic value (such as amplitude value, offset value, or waveform distortion for each phase of two-phase...
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7012399 |
Position detector correction method and electrically-powered steering apparatus
This invention provides an electrically-powered steering apparatus capable of assisting a steering torque appropriately using a resolver. A reference signal is applied to a resolver arithmetic...
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7009535 |
Resolver/digital converter and control apparatus using the same
This resolver/digital converter has a resolver, a resolver/digital converting portion and an exciting signal generator. The exciting signal generated from the exciting signal generator is supplied...
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6943711 |
Frequency-digital signal conversion circuit
There is provided a frequency-digital signal conversion circuit for automatically converting a clock frequency into a digital signal. The frequency-digital signal conversion circuit includes: a...
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6912427 |
Programmable limit switch with distributed intelligence
A programmable limit switch includes output channels for receiving position data, each position value of the position data representing an incremental advance of a workpiece through a production...
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6894629 |
Resolver/digital converter
An A/D converter converts a sine and cosine wave output of a resolver to form a digital sine and cosine. A microcomputer uses an absolute value of digital sin θ as an address to retrieve θ from a...
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6891489 |
Cross-talk linearity connection
A circuit for processing the outputs of an array of photoconductive detectors, includes amplifiers ( 101 ) for amplifying the detector outputs and analogue-to-digital converters ( 109 ) for...
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6861966 |
Method for providing a digital current fluctuation signal
A method for providing a digital current signal from an analog armature current signal of a motor. The method includes subjecting the analog current signal to an analog-to-digital conversion to...
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6778922 |
Decoder for three phase signal
A heading and Omni-Bearing Selector (OBS) module for converting 3-phase analog heading signals input from a heading synchronic device and analog sine and cosine bearing signals input from an OBS...
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6744230 |
Method and apparatus for fine resolution brushless motor control
A motor controller ( 30 ) includes three analog Hall-effect sensors ( 42, 44, 46 ) for forming continuous-time signals proportional to the sine and cosine of the position of the rotor ( 24 ) of a...
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6707401 |
Calculation processing device of resolver signal
In a calculation processing device of a resolver signal, a processing speed of the resolver signal is increased, and a noise-proof characteristic thereof and also reliability thereof are improved,...
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6639529 |
System and method for delay calibration in position encoders
Systems and methods are provided for calibrating a sample delay time between a position request time from a host computer and a position encoder sample time. The position encoder includes a...
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6615152 |
Abnormality detecting method and device for position detecting device, and electric power steering device
In an abnormality detecting device for a position detecting device which generates an amplitude-modulated or phase-modulated signal from a position sensor according to the rotational position of...
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6608573 |
Automatic resolution changing method and circuit for use in digital conversion of two-phase sinusoidal wave signals
The present invention provides an automatic resolution changing method and circuit for use in a high-precision digital conversion of two-phase sinusoidal wave signals. The angular velocity (dφ/dt)...
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6608574 |
Device, system, and method for compensating for isolation and cable delays in an SSI encoder interface circuit
At least one exemplary embodiment of the present invention includes a method for compensating for delays in a circuit of a serial encoder. The method includes determining at least one delay...
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6583738 |
Positioning system
A positioning system in which a absolute sensor detection signals are communicated to a controller, which is a personal computer, via a PC card. The PC card is provided with sensor connection...
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6507305 |
Pipelined analog-to-digital converter with noise shaping
An analog-to-digital converter including a first module of the type having a series of processor stages, each of the stages performing two conversions of the signal output by the preceding stage,...
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6489908 |
Wireless local loop terminal and system having high speed, high resolution, digital-to-analog converter with off-line sigma-delta conversion and storage
A wireless local loop apparatus and corresponding system having an improved DAC operable at higher speed than heretofore achievable which exploits the sigma-delta principle in a different way. More...
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6486805 |
Frequency to digital converter
According to an embodiment of the present invention, an input signal is provided to an oscillator, which creates a count signal with a greater frequency than the input signal. The input signal...
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6469651 |
Multi-function type absolute converter
A multi-function type absolute converter comprises a sensor I/O port having a plurality of sensor connection terminals that can be connected to a plurality of absolute sensors, a conversion circuit...
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6426712 |
Fault-signal generators and methods for resolver systems
Resolver systems are described that generate an estimate φ of a rotatable member's position angle θ and provide fault signals which monitor the reliability and accuracy of the estimate. The fault...
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6407684 |
Method and device for estimating the frequency of a digital signal
A frequency estimator for estimating the frequency of a digital input signal (x(k)) includes a phase detection device ( 2 ) for determining the phase (φ(k)) of the input signal (x(k)), a...
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6377194 |
Analog computation device using separated analog signals, each having a specified amount of resolution, and signal restoration devices
An analog computation system which forms a hybrid between analog and digital computation. The analog signal is divided into a plurality of separated analog signals, each of the different analog...
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RE37547 |
Software-based resolver-to-digital converter
A software-based resolver-to-digital converter (RDC) ( 80 ) for computing an angle of rotation Θ of gimbal-mounted instrumentation ( 16 ) in a gimbal system. The RDC ( 80 ) computes the angle of...
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