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. 15, 1991
Filed:
Sep. 28, 1989
Michael G Aimone, Westland, MI (US);
Julian A LoRusso, Woodhaven, MI (US);
William E Tobler, Willis, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
An engine valve control system for controlling engine valve lift during an automatic transmission shift. A plurality of engine valve actuation systems are each coupled to an individual engine valve for electronically controlling valve lift. Each valve actuation system includes a hydraulically operated piston coupled to each of the engine valves, and an electronically actuated supply valve responsive to a supply signal and coupled between the hydraulically operated piston and a source of hydraulic fluid, and an electronically actuated drain valve responsive to a drain signal and coupled between the piston and source of hydraulic fluid. A controller responsive to a shift command from a transmission controller, provides the supply and drain signals in appropriate timing and phase relationship to reduce valve lift during the automatic transmission shift. In another aspect of the invention, the controller also reduces the hydraulic coupling force applied to the clutch elements during an automatic transmission shift.