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:
Feb. 17, 2009
Filed:
Oct. 04, 2005
Ravinder Venugopal, Montréal, Québec, CA;
Ravinder Venugopal, Montréal, Québec, CA;
Other;
Abstract
A method/system for achieving force control in externally driven hydraulic/gas-filled cylinders estimates effective flow parameters based on sensor measurements, and predicts desired flow parameters for force control objectives and determines required control actuation signals. The system selectively uses pressure sensors to measure the pressure of fluid in each (hydraulic) cylinder, displacement sensors to measure the displacement of the piston in each (hydraulic) cylinder, piston velocity sensors or piston velocity estimators, manifold pressure sensors or manifold pressure estimators, converters that digitize analog signals from the sensors, a microprocessor capable of storing data from the converters and producing actuator signals, and flow regulating actuators responsive to the actuator signals for regulating the flow of (hydraulic) fluid out of each cylinder by changing the effective flow-area of flow ports. The invention can be used in hydraulic or gas-filled cylinder arrangements applied to die-cushions in stamping presses and active/semi-active shock absorbers.