United control system comprising a plurality of control units independently controllable
US5821666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Sep 20, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Control units U.sub.i-1, U.sub.i and U.sub.i+1, each having a piezoelectric actuator 3, are aligned on a resilient substrate 1 at predetermined intervals, so as to constitute a united control system. An actuator controller, formed on a circuit substrate 4 of control unit U.sub.i, receives target displacements of neighboring other control units U.sub.i-1 and U.sub.i+1. Then, using a discrete difference equation derived from the partial differential equation describing the distributed parameter system model of the united control system, the displacement amount of control unit U.sub.i can be determined based on the target displacement of the control unit U.sub.i and the target displacements of the neighboring other control units U.sub.i-1 and U.sub.i+1 thereby driving piezoelectric actuator 3 smoothly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.