Methods and systems for engine control
AssigneeFord Global Technologies, LLC
InventorsFelix Nedorezov, Hong Jiang, Alex O'Connor Gibson
Life of this patent
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Abstract
Systems and methods are provided for restarting an engine that can be selectively deactivated during idle-stop conditions. In one embodiment, the engine is restarted with torque reduction over an interval of the restart, for example, by upshifting the transmission. In response to a vehicle launch request, the torque reduction is decreased, for example, by downshifting the transmission, to expedite return of driveline torque.
Claims20
A method of controlling a vehicle engine coupled to a transmission, comprising:
- during an engine restart from idle-stop, when operator torque demand is lower than a threshold,
- reducing an engine torque conveyed to vehicle wheels over an interval of the engine restart;
- and
- in response to an operator torque demand being higher than the threshold, decreasing the engine torque reduction.
A method of controlling a vehicle engine coupled to a transmission, comprising
- during an automatic engine restart, restarting the engine with the transmission in a first higher gear;
- and
- in response to a torque demand being greater than a threshold, shifting the transmission to a second lower gear.
A vehicle system, comprising:
- an engine;
- a transmission coupled to the engine, the transmission including one or more gear clutches;
- an accelerator pedal for receiving a torque demand from a vehicle operator;
- and
- a control system with computer readable code for,
- during an automatic engine restart,
- restarting the engine;
- adjusting the one or more gear clutches to place the transmission in a first higher gear;
- receiving a torque demand from the vehicle operator;
- and
- in response to the torque demand being higher than a threshold, shifting the transmission to a second lower gear.
Dependencies are inferred from the claim text.