Methods and systems for reducing gear lash noise
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, Jeffrey Allen Doering, Dennis Craig Reed, Gregory Michael Pietron, James William Loch McCallum
Life of this patent
Estimating the term…
Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, driveline gear lash gear tooth to gear tooth impact may be reduced via adjusting operation of an electric machine. For example, gear tooth to gear tooth impact may be reduced by operating the electric machine in a speed control mode to manage torque during driveline torque transition from a negative torque to a positive torque.
Claims20
A method for controlling driveline lash, comprising:
- shifting a transmission to a gear that permits an electric machine that is coupled to the transmission to operate at a lower speed than a base speed of the electric machine in response to a decrease in a driver demand torque;
- and
- reducing gear tooth to gear tooth impact via operating the electric machine in a speed control mode during a driveline torque transition from a negative torque to a positive torque.
A method for controlling driveline lash, comprising:
- reducing gear tooth to gear tooth impact via operating an electric machine in a speed control mode during a driveline torque transition from a negative torque to a positive torque;
- and
- accelerating the electric machine to control a speed profile between a first gear tooth and a second gear tooth during the driveline torque transition from the negative torque to the positive torque.
A vehicle system, comprising:
- an engine;
- a dual mass flywheel including a first side mechanically coupled to the engine;
- a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel;
- a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch;
- a transmission selectively coupled to the engine via the driveline disconnect clutch;
- and
- a controller including non-transitory instructions executable to automatically stop engine rotation, reduce a gear tooth to gear tooth impact via operating the DISG in a speed control mode during a driveline torque transition from a negative torque to a positive torque, and to start engine rotation while reducing the gear tooth to gear tooth impact.
Dependencies are inferred from the claim text.