Hamilton Sundstrand Corporation

John O'Neil

Jeffry K Kamenetz

Mark A Johnston

Edward John Marotta

John J Nardella

James Saloio

William Betterini

Dana N Switzer

Patricia M Ahearn-Heyse

Cathleen R Bleier

Systems and methods for sensor position measurements are provided. Aspects include receiving, through a first signal path, a first secondary signal from a first sensor and a built in test (BIT) signal, wherein the first signal path comprises a first multiplexer connected to a first filter, receiving, through a second signal path, a second secondary signal from the first sensor and the BIT signal, wherein the second signal path comprises a second multiplexer connected to a second filter, wherein the first signal path and the second signal path are connected to a third multiplexer, wherein the third multiplexer is connected to a first analog to digital converter (ADC), receiving, by a controller, an output signal from an output of the first ADC, and determining, by the controller, a position measurement for the first sensor based on the first secondary signal, the second secondary signal, and the BIT signal.

Ratiometric position measurement

A system and method for generating input signals for an electronic engine control module includes a first waveform generator that is configured to generate a simulated first speed signal that is representative of a first speed and a vibration modulating signal that is representative of the first speed, a second waveform generator that is synchronized with the first waveform generator is configured to receive the vibration modulating signal and to generate a simulated second speed signal that is representative of a second speed and a simulated composite vibration voltage signal, and a voltage-to-charge converter that is configured to receive the simulated composite vibration voltage signal from the second waveform generator and to generate a simulated composite vibration charge signal that simulates a speed/vibration composite signal from an accelerometer.

Method for simulating an N1 and N2 speed vibration composite input for development and/or model based testing of engine control hardware and embedded software

System and methods for partial RMS calculation of overcurrent in VDT driver circuits are provided. Aspects include sampling, by an FPGA, a set of current values from a sense resistor, wherein the sense resistor is coupled between a driver circuit and a VDT, determining, by the FPGA, an overcurrent event in the driver circuit based on the set of current values, wherein determining the overcurrent event in the driver circuit based on the set of current values includes trimming each current value to create a trimmed current value for each current value, calculating a square value for each trimmed current value and storing the square value in a buffer, calculating a mean for the square values, and determining the overcurrent event based on the mean being outside a predefined range of means, and disabling the driver circuit based on the determination of the overcurrent event.

Partial RMS based over-current detection for VDT excitation

A system for reducing message dropout rate in a communication system is provided. Message dropouts occur during transportation of isochronous datasets across a plesiochronous boundary. The system includes a first processing element configured to operate in response to a first clock signal at a first clock speed. The system further includes a second processing element configured to operate in response to a second clock signal at a second clock speed, different from the first clock speed. The second processing element is operably connected to the first processing element by a data bus. The first processing element and the second processing element are configured to indicate a fault when no dataset is received during a processing interval. If two different datasets are received within the same processing interval one of the two datasets is dropped.

Message dropout minimization when transporting isochronous packets across a plesiochronous boundary

A multi-channel control system includes a first primary control microprocessor and a second primary control microprocessor operable to control a device, and a first secondary control microprocessor and a second secondary control microprocessor operable to control the device. Each of the first and second primary control microprocessors and the first and second secondary control microprocessors are arranged as an independent control channel.

Multi-channel control switchover logic

A multi-channel controller uses multiple logic gates and multiple control channels to provide fault tolerant protection against undesired events.

Multi-channel protection logic

A method of initializing speed sensors in a rotational system is used determine a sensor spacing. An indexing feature is identified at each of two locations on an outer circumference of a wheel path corresponding to two speed sensors, as well as the speed of the wheel. The spacing of the sensors is then determined.

Speed sensor identification

Embodiments are directed to commanding, by a controller, a step in connection with a stepper motor. Further, embodiments include discharging a current in a coil of the stepper motor by transferring the current to a capacitor coupled to the coil responsive to the commanded step and driving a current in the coil. The driving of the current in the coil includes using charge stored on the capacitor during the discharging of the current in the coil.

Motor speed enhancement

A resolver interface includes an excitation coil, a first secondary coil, a second secondary coil, a sampling circuit, and a controller. The excitation coil receives an excitation signal that generates first and second signals in the first secondary coil and the second secondary coil, respectively. The sampling circuit includes a multiplexer that samples at least one period of the excitation signal, the first signal, and the second signal, individually. The controller is configured to calculate a sign of the first signal and the second signal relative to the excitation signal, wherein based on the calculated sign of the first signal and the second signal the controller determines a quadrant of the excitation coil and based on the determined quadrant and magnitudes of the sampled first signal and second signal calculates a position of the excitation coil.

Resolver interface

Embodiments are directed to a stepper motor and a controller, where the controller measures a parameter associated with a current of the stepper motor prior to support of commanding a step in connection with the stepper motor. That is, the controller commands the step in connection with the stepper motor, measures a parameter subsequent to commanding the step, compares the measurements of the parameter, and determines whether a fault exists with respect to the stepper motor based on the comparison of the measurements.

Stepper motor phase failure detection

A multi-channel stepper motor controller has at least a first and second stepper motor control channel. Each of the control channels has a solid state switching circuit operable to connect the control channel to a stepper motor.

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Litchfield, CT, United States of America

John O'Neil