Control system for speed synchronized clutch operation during gear shift of engine driven transmission

US4685548A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Otto Holtermann · Tettnang, DE
• Klaus Torbusch · Ahausen, DE
• Gerold Bieber · Tettnang, DE

Key dates

• Filing date: Jun 18, 1986
• Grant date: Aug 11, 1987
• Expiry date: Jun 18, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2059/385
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Control system for a pressure medium operated clutch (1) and reduction gear unit (4) to qualitatively improve torque reversal gear shifts by measurement of rotational speeds of the gear unit input shaft (41) and the turbine shaft (320) of a torque converter (3) through sensors (51, 52) and determination of differential speed conditions by an electronic unit (5) to which the sensors are connected. Upon displacement of the gear shift lever from neutral to gear drive position, the electronic unit issues a corrective fuel controlling command through line (22) for a length of time sufficient to obtain equality between the turbine speed (Nt) and the gear input speed (Ni) plus a correction factor (AN). The corrective command is applied to a control lever (71) of the engine fuel injection pump (7) through an automatic operating arrangement (90) superimposed on the fuel control linkage (8) connected to the control lever.