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:
Mar. 30, 1976
Filed:
Jul. 24, 1974
Larry O Gray, Greens Fork, IN (US);
Dana Corporation, Toledo, OH (US);
Abstract
Disclosed is an electronic vehicle speed control with a fluid actuating means. Typically the actuating force is derived from the vehicle engine manifold vacuum applied selectively to a bellows operatively connected to the throttle mechanism. A dead-band type control is provided. When the actual vehicle speed is below the dead band range a valve is operated to allow the control fluid to increase the throttle setting. When the vehicle speed is above the dead band range a valve is operated to allow the control fluid to decrease the vehicle setting. In the preferred and specifically described circuit a circuit is provided to translate a contact closure rate into a D. C. voltage proportional to vehicle speed. A constant current source drives a series circuit including a speed set potentiometer and a dead-band setting resistor. The set speeds at either end of the dead band are compared to the actual speed and vacuum is 'admitted' to or 'dumped' from the bellows to return the actual speed within the dead band. Such a system provides very satisfactory control while affecting engine operation much less than a conventional vacuum powered vehicle speed control. Several novel safety and operational sub-circuits are also provided.