Abstract: A method for counting elapsed real time using a counter wherein, in one embodiment, the length of the counter is a sixteen bit number which, in one embodiment, has been divided into six ranges of logarithmic numbers which each have been assigned a different real time value. A recorded logarithmic number is converted into the elapsed real time to be counted by converting the logarithmic numbers in each of the ranges preceding the recorded logarithmic number into a real time value and then adding up all of the real time values to arrive at the elapsed real time.

Abstract: A method of determining a speed of a wheel that involves providing a resolver having a rotor and a stator which resolver produces at least one output signal, operatively connecting the rotor to a wheel such that the resolver is rotated by the rotation of the wheel, producing digital signals indicative of a position of the rotor relative to the stator based on the at least one output signal, and calculating a velocity of the wheel from the digital signals. The digital signals may be used alone or in conjunction with analog wheel speed signals. Also a speed sensor for practicing this method.

Abstract: A process of enhancing repeatability of the force applied to an object by an electromechanical system having an electric motor, a rotary to linear motion converter and a gear train mechanically coupling the motor to the converter includes providing an analog signal having a magnitude indicative of the desired force, supplying the analog signal to the motor to apply force to the object, removing the analog signal from the motor and reapplying the signal before any free play motion within the converter and gear train can occur. During a command for a desired force, the sequence of supplying the analog signal to the motor to apply force to the object, removing the analog signal from the motor, and resupplying the analog signal to the motor prior to any free play motion occurring within the gear train and converter are repeated several times. The rapid reapplication of the analog signal prevents any backlash associated with the gear train and converter.

Abstract: A real-time recall feature for an engine data processor (20). An engine mounted data processor (20) inputs a plurality of engine operating parameters from a gas turbine engine (10). These parameters are fault checked and reformatted by the processor (20) before being output on a serial transmission channel (XCH) to an airframe mounted permanent recording apparatus (30). A set of the most recent engine profiles are stored in a dynamic random access memory (DRAM) which is constantly updated by overlaying the oldest data with the most recent. A switch (52) generates a signal (FRZ) to terminate storage of the profiles and freeze the contents of the (DRAM). The memory remains frozen having captured the most recent engine profiles associated with the generation time of the signal (FRZ) until unloaded over the channel (XCH) to recorder (30). The output of the (DRAM) is in response to a signal (RPL) generated by switch (52).