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US 9,039,571 B2Granted
Method and system for engine control
AssigneeFord Global Technologies, LLC
InventorsJeffrey Allen Doering, Joseph Norman Ulrey, Alex O'Connor Gibson
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for controlling an engine system with a variable cam timing device. In one example, the variable cam timing device is operated to adjust engine valve timing differently at engine stop based on whether the engine stop is in response to an operator request or in response to an automatic controller initiated engine stop without an operator request.
Claims17
A method of controlling an engine, comprising:
- operating the engine with an intake valve closing timing;
- adjusting the intake valve closing timing from the intake valve closing timing to a first timing in response to an operator requested engine stop;
- and
- adjusting the intake valve closing timing from the intake valve closing timing to a second timing based on a transmission torque downstream of a torque converter and in response to an automatic controller requested engine stop.
1 more element
A method of controlling an engine, comprising:
- adjusting a variable cam timing device to adjust intake valve timing in response to an automatic controller requested engine stop;
- and
- adjusting the variable cam timing device to further adjust the intake valve timing responsive to a transmission input shaft speed downstream of a torque converter during engine stop.
A method of controlling an engine, comprising:
- adjusting the intake valve closing timing during an engine stop based on a transmission torque downstream of a torque converter.
Dependencies are inferred from the claim text.