| 摘要 |
A multi-point control system suitable for applications where a large number of processes, typically in excess of 100, are all required to be stabilized at the same operating conditions. The control system comprises on-off controllers fed with a common set-point signal. The controllers being adapted to function as time-proportional controllers by the perturbation of either the set-point signal or the process parameter signal by a periodic waveform. Other signals may be combined with the perturbing signal to provide, for example, compensation for a fluctuating power supply, or for environmental conditions affecting the deviations at the inputs of controllers. Such a system has economical advantages and by slight modifications to the controllers, the system can be used for differing applications.
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