Swap-shift control system for a multiple ratio transmission

US5835875A · kind A · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Johann Kirchhoffer
• Thomas Martin · Burns Lake, CA
• Eric Reichert · Mölsheim, DE
• Werner Croonen · Bergheim, DE
• Thomas A. Wagner · Northville, US
• Wolfgang Wickler · Farmington Hills, US

Key dates

• Filing date: Aug 23, 1996
• Grant date: Nov 10, 1998
• Expiry date: Aug 23, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2306/52
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An automatic transmission having a multiple ratio gearset arranged in series with an overdrive gearset wherein ratio upshifts and downshifts are effected by separate reaction brakes for each gearset, each brake being independently controlled to achieve an enhancement of shift quality using closed loop control of reaction brake pressure and high ratio clutch pressure as a function of turbine speed, output shaft speed, brake drum speed for the multiple ratio gearset and input shaft speed in establishing control of upshifts and downshifts.