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A Transient Diesel Test Bed with Direct Digital Control
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English
Abstract
A computer controlled test bed is described, developed for transient testing of diesel engines. Objectives achieved have been rapid response, good accuracy and repeatability flexibility for testing different engines, minimum hardware cost and concurrent rapid data logging for research purposes. Eddy current dynamometers are used with pulsed voltage excitation for rapid response. Stepping motors are used for “throttle” control with software pulse generation.
Control is via software based on dynamometer and stepping motor models for time optimal algorithms. Preview can be used to improve accuracy on prescribed test cycles. Results for step Inputs, power-speed law control and disturbance rejection tests are presented with special emphasis on the Interaction between engine and control system characteristics.
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Authors
Citation
Koustas, J. and Watson, N., "A Transient Diesel Test Bed with Direct Digital Control," SAE Technical Paper 840347, 1984, https://doi.org/10.4271/840347.Also In
Diesel Exhaust Emissions-Particulate Studies and Transient Cycle Testing
Number: SP-0578; Published: 1984-08-01
Number: SP-0578; Published: 1984-08-01
References
- Bloxham R.D. et al. “Computer control for IC Engines Development” CME 19 9 1972
- Marzouk M. Watson N. “Some Problems in Diesel Engine Research with special reference to Computer control and Data Acquisition” Proc.I.Mech.E. 190 23 1976
- Watson N. et al. “A Microprocessor Controlled Test Facility for Transient Vehicle Engine System Development” IEE 3rd Int. Conf. on Automotive Electronics London October 1981
- Koustas J. “Optimal Control of Engine Test Beds by Microcomputer Networks” Ph.D. thesis, University of London 1984
- Cox J. B. et al. “A Practical spectrum of DOC Chemical Process-Control Algorithms” ISA Journal OCTOBER 1966
- Germane G. J. Heaton H. S. “A Dynamic Test Facility with Motoring using a Digital computer” SAE 800412 1980