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AssigneeCummins Electronics Company, Inc.
InventorsGregory R. White, Larry R. Webber, Richard E. Kleine, Edwin A. Johnson
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A control system for controlling automatic shifting of a manual/automatic transmission is disclosed including a cruise control system and an auto-shift mode for controlling automatic upshift and downshift operations between the top two gears of a heavy duty truck transmission. Certain failures of equipment or incorrect driving habits of operators are corrected for with algorithms which prevent undesirable operating conditions which compromise the acceptability of an electronically controlled heavy duty truck transmission equipped vehicle. The mechanism by which auto-shift operation of the transmission is requested is also compared with parameters such as vehicle speed and engine speed in order to determine whether gears should be engaged or disengaged, the gears being those subject to auto-shift control of the system controller.
A device for controlling gear engagement/disengagement of a manual/automatic transmission which is coupled to an engine, the transmission including a manual mode of operation wherein a plurality of gear ratio operation states are selectable according to a driver input and an automatic mode of operation wherein first and second automatically engagable gear ratio operation states and a neutral operation state are selectable by said device when the transmission is placed in the automatic mode of operation, said device comprising:
A method for controlling gear engagement/disengagement of a manual/automatic transmission that is coupled to an engine, wherein the transmission includes gear shift means, a manual mode of operation wherein a plurality of gear ratio operation states are selectable according to driver positioning of the shift means, said transmission also having an automatic mode of operation wherein first and second automatically engagable gear ratio operation states and a neutral operation state are automatically selectable when the shift means are positioned in an automatic mode position, said method comprising the steps of:
Dependencies are inferred from the claim text.