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:
Oct. 27, 1981
Filed:
Jul. 20, 1979
Gerd Oberpichler, Brunswick, DE;
Ernst-August Honig, Wolfsburg, DE;
Volkswagenwerk Aktiengesellschaft, Wolfsburg, DE;
Abstract
A hydraulic control device for an automatic vehicle transmission includes a main pressure control valve for delivering an engine load-dependent main output pressure for operating actuating components of the vehicle transmission and a pressure-limiting valve for delivering an engine load-dependent, upwardly limited control pressure. The pressure-limiting valve includes a control piston exposed to the control pressure and to the force of a spring opposing the control pressure. The device further has an additional control valve for applying to the main pressure control valve an output pressure which is a function of a vehicle speed-dependent pressure and the control pressure and which is modulated by the control pressure and a higher main input pressure.