Method and system for engine control
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, Felix Nedorezov, Chad Everette Griffin
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for restarting an engine in response to a driver's change-of-mind. In one embodiment, the engine is shutdown during an idle stop with the transmission in a higher gear or with the transmission tied-up to a transmission case. In response to a driver change-of-mind restart request, the transmission is downshifted, or released from the tie-up, to return driveline torque.
Claims17
A method of operating a vehicle engine coupled to a transmission, comprising:
- during an automatic engine idle-stop, operating the transmission in a first, higher gear;
- and
- in response to a driver change-of-mind restart, shifting the transmission to a second, lower gear, a timing of the shifting based on an engine speed at which the driver change-of-mind restart is requested.
A method of operating an engine coupled to a transmission, comprising:
- in response to an automatic engine idle-stop, tying up the transmission to a transmission case;
- and
- in response to a driver change-of-mind restart, releasing the transmission from the tie-up;
- and
- further comprising operating the transmission at a first gear during the engine idle-stop and shifting the transmission to a second gear in response to the driver change-of-mind restart, the first gear having a lower gear ratio than the second gear.
A vehicle system comprising,
- an engine coupled to a transmission;
- an accelerator pedal and a brake pedal for receiving a torque demand from a vehicle operator;
- and
- a control system with computer readable code for,
- during an idle-stop, shutting down the engine and reducing a transmission output torque;
- and
- in response to a driver change-of-mind restart, reactivating the engine and decreasing the transmission output torque reduction, wherein the transmission output torque reduction includes tying up the transmission to a transmission case with a first, lower amount of clutch slippage, and wherein decreasing the transmission output torque reduction includes tying up the transmission to the transmission case with a second, higher amount of clutch slippage.
Dependencies are inferred from the claim text.