Apparatus for synchronizing the driving and driven members during gear shift operations
Method for driver-dependent shift control of a vehicle sub-transmission which maximizes fuel economy
ApplicationNo. 07/123504 filed on 11/20/1987
US Classes:74/337, Torque responsive477/109Diminution during transmission change
ExaminersPrimary: Braun, Leslie A.
Assistant: Macris, Harold F.
Attorney, Agent or Firm
International ClassesF16H 63/40 (20060101)
F16H 63/00 (20060101)
F16H 59/42 (20060101)
F16H 59/70 (20060101)
AbstractA vehicular transmission shift control system is provided for effecting automatic shifting between a group of sequentially related forward gear ratios provided by the transmission that includes a logic member (16) operative to receive and process an engine speed signal (22) and a gear ratio position signal (30) and to provide an output control signal (33) to a shift actuator (34) that is operative to enable automatic shifting between the sequentially related forward gear ratios whenever the lowest sequentially related forward gear ratios of the group is manually engaged by an operator of the vehicle. Fuel to the engine is controlled (26) to cause a torque reversal across an engaged jaw clutch (80-86, 82-88, 84-90) to assure disengagement thereof without requiring disengagement of the master clutch (8).
Field of SearchTorque responsive