System and method for decreasing ratio changing time in electron

Machine element or mechanism – Gearing – Interchangeably locked

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477 86, 477 92, 192 4A, F16H 5900, F16H 6100, F16D 6700, B60K 4102

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active

056554079

ABSTRACT:
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.

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