Control system/method for engine brake assisted shifting

Details Control system/method for engine brake assisted shifting Control system/method for engine brake assisted shifting

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 61/04 (2006.01) F01L 13/06 (2006.01) F02D 13/04 (2006.01) F02B 3/06 (2006.01) F16H 61/21 (2006.01) F16H 63/40 (2006.01)

Patent

CA 2129815

A control method/system for controlling upshifting in an automated mechanical transmission system (10) provided with an engine compression brake (50) is provided. A control unit (54) is effective to operate the engine compression brake during a transmission upshift such that at initiation of an upshift the engine compression brake applies a minimum retarding torque to said engine, said retarding torque is then gradually increased to a maximum retarding torque value and, upon sensing that engine speed (ES) is within a predetermined value (REF1) of the synchronous value thereof, the retarding torque applied by said engine brake is caused to gradually decrease until such time as engine speed reaches the synchronous window therefor.

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