Engine brake enhanced upshift control method/system

Details Engine brake enhanced upshift control method/system Engine brake enhanced upshift control method/system

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 63/06 (2006.01) F16H 61/16 (2006.01) F16H 61/21 (2006.01) F16H 59/14 (2006.01) F16H 59/46 (2006.01) F16H 59/48 (2006.01) F16H 61/02 (2006.01)

Patent

CA 2139601

A control system/method for an at least partially automated mechanical transmission system (10), including a controller (106) operated engine brake (EB), is provided. The control system/method is effective to determine if selected upshifts into a target gear ratio are feasible (212, 214) or not feasible (216) under current vehicle operating conditions and to prohibit the initiation of not feasible selected upshifts. The transmission system includes an engine brake actuator (23A) operable by the system controller (106). Selected upshifts are evaluated and will be implemented, if feasible, in a sequence wherein feasibility is a function of engine deceleration (dES/dt), and engine deceleration is assigned expected values at minimum to progressively greater engine braking.

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