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AssigneeEaton Corporation
InventorsJohn Dresden, III, Thomas A. Genise, Simon Hornby, Ronald K. Markyvech, Richard A. Nellums, John E. Stainton
Estimating the term…
A system and method for decreasing the time required to complete a ratio change in an electronically enhanced powertrain system is provided. The powertrain system includes a number of devices for providing a retarding torque to engine rotation to increase the decay rate of the engine speed during an upshift. These devices include an engine brake and an input shaft brake. A retarding torque is also provided by increasing engine accessory load by controlling various engine accessories such as a cooling fan, an air compressor, a hydraulic pump, an air conditioning compressor, and an alternator.
A method for reducing ratio changing time in a mechanical powertrain system including an engine coupled via a master friction clutch to a mechanical change gear transmission having a plurality of gear ratio combinations and a neutral gear state selectively engageable between a transmission input shaft and a transmission output shaft, the system also including an electronic control unit for receiving a plurality of input signals to determine current operating conditions and for generating command signals, the system further including an inertia brake controlled by the electronic control unit to selectively retard engine rotation, the method comprising:
A system for reducing ratio changing time for a mechanical powertrain including an engine coupled via a master friction clutch to a mechanical change gear transmission having a plurality of gear ratio combinations and a neutral gear state selectively engageable between a transmission input shaft and a transmission output shaft, the system comprising:
Dependencies are inferred from the claim text.