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:
Aug. 10, 1999
Filed:
Dec. 30, 1996
Craig W Bladow, Perrysburg, OH (US);
Dana Corporation, Toledo, OH (US);
Abstract
A control system and method for operating the solenoid valves for controlling the supply of hydraulic fluid to a hydraulic actuator is described. The system and the method involves initially applying a first, increasing linear pressure up to a predetermined magnitude and then holding the pressure at that level for a period of time. This predetermined magnitude is equal to the amount of pressure required to cause initial movement of the piston. By holding the pressure level at a plateau for a period of time, the initial movement of the piston is accomplished in a smooth manner. This period of time is relatively short, typically less than one second. Thereafter, the system and the method involve operating the solenoid valves so as to apply a second, increasing linear pressure up to a predetermined final magnitude.