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US 2018/0001896 A1Published application
System and method for performing an engine stop and start for a rolling vehicle
AssigneeFord Global Technologies, LLC
InventorsAlexander O`Connor Gibson, Steven Anatole Frait, Matthew John Shelton, Kirk Pebley, Hong Jiang
Life of this patent
Estimating the term…
Abstract
Methods and systems for improving operation of a vehicle driveline that includes an engine and an automatic transmission with a torque converter are presented. In one non-limiting example, the engine may be stopped while a vehicle in which the engine operates is rolling. A transmission coupled to the engine may be shifted as the vehicle rolls so that vehicle response may be improved if a driver requests an increase of engine torque.
Claims14
1-7. (canceled)
A method for operating a vehicle driveline, comprising:
- activating an electric transmission pump in response to a request to stop an engine;
- and
- adjusting a speed of the electric transmission pump in response to an estimate of an amount of time between transmission gear shifts.
A vehicle system, comprising:
- an engine;
- a transmission coupled to the engine and including a torque converter having a torque converter clutch, an electric pump, a mechanical pump, an accumulator positioned downstream of the electric pump and the mechanical pump, and a valve positioned at an outlet side of the accumulator;
- a controller including executable instructions stored in a non-transitory memory for selectively stroking a transmission gear clutch without fully closing the transmission gear clutch in response to a request to improve vehicle drivability at expense of vehicle energy consumption, and to not stroke the transmission gear clutch in response to a request to improve vehicle energy consumption at expense of vehicle drivability, the transmission clutch stroked or not stroked while the engine is stopped.
Dependencies are inferred from the claim text.