Horiba Instruments, Inc.

Schenck Pegasus Corporation

Donald Bryce Johnson

Norman Malcolm Newberger

Isaac Cohen Anselmo

A control system includes a controller. The controller repeatedly excites a control loop characterized by parameters having randomly selected values for each excitation and scores a response of the control loop to each excitation relative to a target signal until the scores no longer achieve a value less than a minimum of the scores for a predefined number of excitations occurring after the excitation yielding the minimum of the scores to auto-tune the control system.

Control system auto-tuning

A dynamometer may be configured to simulate the rotating inertial characteristics of a wheel-tire assembly slipping relative to a road surface and having rotating inertial characteristics different than the rotating inertial characteristics of the wheel-tire assembly being simulated.

Wheel slip simulation systems and methods

A test stand may include a clutch operatively arranged with a dynamometer and a flywheel. The test stand may further include a controller configured to control the clutch to decouple a rotating inertia of the dynamometer from a rotating inertia of the flywheel such that the rotating inertia of the flywheel exhibits a desired rotating inertia.

Vehicle drivetrain test stand and method of controlling same

A rotational testing system for a test article includes a rotational test stand. The rotational test stand includes a rotating element having a drive end capable of being mechanically coupled with the test article. The rotational testing system also includes a non-isolating torsional damper attached to the rotating element.

Rotational testing system

A method and apparatus for multi-channel control of a multiple input, multiple output, servo-driven plant utilizes finite impulse response (FIR) filters to model the inverse of the plant. Each channel includes a servo FIR filter that generates a servo command to drive the plant's servo controller, a valve current FIR filter that bypasses the PID stage of the servo controller to avoid undesirable effects of the PID loop, and a cross FIR filter for each of the remaining channels that compensates for physical coupling in the plant between the channels. The servo FIR filter is calculated by an adaption routine that involves applying an identification signal to the plant, applying the plant's response to the filter and then updating the filter's coefficients using the error that exists between the identification signal and the filter output. To reduce the convergence time, the identification signal is separated into parts in accordance with the amplitude spectral response of the plant and the parts are applied sequentially. The valve current and cross FIR filters are calculated using a forward drive adaption routine in which the identification signal is applied to the filter and the filter output to the plant. The forward drive adaption routine utilizes the phase response of the plant which is provided by way of another FIR filter that includes the inverse a plitude frequency response of the plant. Non-linear error correction is provided via an error store that provides an error correction that is added to the desired command.

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Algonac, MI, United States of America

Donald Bryce Johnson