Transmission shift control system
AssigneeEaton Corporation
InventorEugene R. Braun
Life of this patent
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Abstract
A 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.
Claims14
A shift control system for a vehicular transmission having a plurality of groups of forward gear ratios ranging from a first group including a lowest gear ratio to a highest group including a highest gear ratio with each of said groups having a lowest gear ratio manually selectable by an operator and with at least said highest group including sequentially related higher gear ratios, said transmission including actuator means enabling automatic shifting between the sequentially related gear ratios of at least said highest group, and said control system including means for sensing at least when the lowest sequentially related gear ratio of said highest group is manually selected by the operator and operable to enable the actuator means to effect automatic shifting between the sequentially related gear ratios within said highest group when the lowest sequentially related gear ratio within said highest group is manually selected by the operator, all of the gear ratios of said first group requiring manual selection by the operator.
A shift control system for a vehicular transmission having a plurality of groups of forward gear ratios ranging from a first group including a lowest gear ratio to a highest group including a highest gear ratio with each of said groups having a gear ratio manually selectable by an operator and with at least said highest group including a plurality of sequentially related highest gear ratios, said transmission including actuator means enabling automatic shifting between the highest sequentially related gear ratios of at least said highest group, and said control system including means for sensing when one of the sequentially related highest gear ratios of said highest group is manually selected by the operator and operable to enable the actuator means to effect automatic shifting between the sequentially related highest gear ratios within said highest group when one of the sequentially related highest gear ratios within said group is manually selected by the operator, the gear ratios of said first group requiring manual selection by the operator.
Dependencies are inferred from the claim text.