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:
Jun. 18, 1991
Filed:
Dec. 26, 1989
Reed D Hanson, Dayton, OH (US);
Scott T Radcliffe, West Lafayette, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
In a suspension control comprising a damper having a valve switchable at frequencies within a desired activation frequency range between high and low damping modes, an unfiltered damper signal is repeatedly derived from vehicle suspension related variables at a range significantly greater than the desired activation frequency range. An output filter derives a filtered damper signal from each successive binary actuator force signal by (1) resetting a timer each time the unfiltered damper signal changes value, (2) causing the filtered damper signal to be the same value as the unfiltered damper signal while the timer is inactive, and (3) maintaining the filtered damper signal value unchanged while the timer is active. The damper is controlled in response to the filtered damper signal, whereby unnecessary high frequency switching of the valve is reduced but the damper responds without unnecessary delay to signals within the desired activation frequency range.