The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2009
Filed:
Mar. 30, 2006
Zhuang Tian, Auckland, NZ;
John H. Boyd, Jr., Holland, MI (US);
Zhuang Tian, Auckland, NZ;
John H. Boyd, Jr., Holland, MI (US);
Fisher & Paykel Appliances Limited, Auckland, NZ;
Abstract
A free-piston linear compressor () controlled to achieve high volumetric efficiency by a controller including an algorithm () for ramping up input power until piston-cylinder head collisions are detected using a detection algorithm () which then decrements power input whereupon input power is again ramped up by algorithm (). Non-damaging low energy collisions are achieved by the controller including a perturbation algorithm () which perturbates the input power ramp with periodic transient pulses of power to ensure piston collisions are provoked during the transient power pulses.