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:
Sep. 03, 1991
Filed:
Mar. 30, 1990
Kazunobu Kawabata, Kanagawa, JP;
Abstract
An active suspension system includes a pressure holding mechanism with a pressure holding valve means which is maintained in conductive state for a given period in which the fluid pressure in a working chamber is gradually adjusted toward a predetermined neutral pressure level after turning OFF of a power switch. The pressure holding valve is, on the other hand, maintained in non-conductive state for a given period until the fluid pressure is adjusted to the neutral pressure after turning ON of the power switch. The system further includes a detector for detecting resumption of power supply after a short period of turning OFF of the power supply. A control system is responsive to the detector for detecting the resumption of power supply after power OFF state for a period shorter than the given period for performing short period resumption mode control operation by maintaining the pressure holding valve at the conductive state and setting the instantaneous fluid pressure in the working chamber as an initial pressure level.