Binary clutch assembly control in neutral-to-drive or neutral-to-reverse transmission shifts

摘要

A vehicle includes an engine, transmission, and controller. The transmission has gear sets each having multiple nodes, an input member continuously connected to the engine and one of the gear sets, and a binary clutch assembly. The controller executes a method to detect a requested event of a binary clutch engagement and to command a calibrated energy pulse from the engine to the input member in response to the requested event. The energy pulse reduces slip across the binary clutch assembly. The controller applies the binary clutch assembly within a calibrated window of initiation of the pulse, and may shift the transmission into reverse or drive. A transmission has the controller, at least first, second, and third gear sets, an input member selectively connected to the first gear set and continuously connected to the second gear set, and a binary clutch assembly connected to the first and second gear sets.

主权项

1. A vehicle comprising:
an internal combustion engine; and a transmission having:
a plurality of gear sets each having a plurality of nodes;an input member that is continuously connected to the engine and to one of the gear sets;a binary clutch assembly that is connected to the same gear set as the input member, wherein the binary clutch assembly has just two possible states: fully applied and fully released; anda controller in communication with the engine and with the binary clutch, wherein the controller includes a processor that is operable to:
detect a requested shift of the transmission from a neutral state to one of a reverse and a drive state;command, via the processor, a calibrated energy pulse from the engine to the input member in response to the detected requested shift, wherein the calibrated energy pulse is a calibrated speed pulse or a calibrated torque pulse that has a rate of increase sufficient for reducing slip across the binary clutch assembly to a target slip of approximately zero; andapply the binary clutch assembly a calibrated duration after commanding the calibrated energy pulse.