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Feed-Forward Dynamometer Controller for High Speed Inertia Simulation
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English
Abstract
In general, control systems may be divided into two categories, feed-back and feed-forward systems. The output of a feed-back system is controlled by first comparing it to a desired value and then generating an error function proportional to the difference. The error function is then added to the system input through a regulator and a feed-back path. Thus, the output is forced to converge toward its correct value. Although this system achieves accurate results, it does so at the expense of response time. A feed-forward system does not employ a feed-back path nor does it generate an error signal. The elimination of these two functions can result in a substantial decrease in response time, particularly, when dealing with inherently slow systems and large errors functions. A feed-forward system controls its output by precisely computing the input function from all state variables that affect the system. In practice, results obtained with feed-forward control alone are not as accurate as those obtained with feed-back. For this reason, a certain amount of feed-back should be used with feed-forward when the system control accuracy must be high. This paper describes a feed-forward control system used in the simulation of road load and inertia in an electric chassis dynamometer. This system is implemented with a digital microcomputer and a high-speed arithmetic logic unit (ALU) to produce high-speed inertia simulation comparable to simulation done with flywheel.
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Citation
D'Angelo, S. and Gafford, R., "Feed-Forward Dynamometer Controller for High Speed Inertia Simulation," SAE Technical Paper 810749, 1981, https://doi.org/10.4271/810749.Also In
References
- Baumeister T. Avallone E. A. Baumeister T. “Standard Handbook for Mechanical Engineers” McGraw-Hill 1979
- Fegraus C. E. D'Angelo S. “Inertia and Road Load Simulation for Vehicle Testing” U. S. Patent No. 4161116 July 17 1979
- Morgan B. Prest K. “Climate Chamber Dynamometer” SAE Technical Paper No. 810288 February 1981
- Kuo B. C. “Automatic Control Systems, Second Edition” Prentice-Hall, Inc. 1967
- D'Angelo S. Gafford R. D. “Advantages of Using Microcomputers in Dynamometer Controllers” SAE Technical Paper No. 810461 February 1981
- Knudsen R. F. “Inertia-Electronically” ISA Journal 5 4 52 54 April 1958
- Pelta E. R. “Chassis Dynamometer” U. S. Patent No. 3832894 September 3 1974