HYDROKINETIC DYNAMOMETER CONTROL SYSTEMS

摘要

1,202,751. Automatic speed, torque or acceleration control. HEENAN & FROUDE Ltd, W. N. BATHURST, B.P. HOGAN, D.B. LEWIS, R.A. REDMAN, N. MACLEAN, T.N. WILLIAMS, R. RICHARDSON and C.G. ESCRITT. Dec.17, 1968 [Feb.28, 1968], No.9661/68. Heading G3R. An operating parameter (speed, torque or acceleration) of an hydrokinetic dynamometer 1 employed to test an engine is detected at 10, compared with a derived value reference 12, which may be a programme, and a difference signal used to control the position of a butterfly valve 3 at the outlet of the dynamometer to maintain the parameter at the desired value. The position of the valve 3 is controlled through a linearizing linkage 9 by a positional servo system 15 employing a servomotor 6, a positional feedback 17 and an acceleration feedback 20. Zener diodes may be switched across the feedback line 11 to modify the control characteristic; the comparison amplifier 13 has variable gain for the same purpose.