| 摘要 |
A method of operating a plurality of machines (11 to 14) such as air compressors, each of which contributes when operative, to a total capacity of a system, comprises sensing with a sensing means (20) the value of a variable parameter e.g. pressure, of the system, feeding a signal from the sensing means (20) to estimate from data stored in a memory (M) thereof, and the signal from the sensing means (20), the expected demand from the system in the immediate future and rendering and maintening operative selected machines (11 to 14) the selection being made by the control means (10) in response to the estimated expected demand. |
