Method and system for controlling fuel usage
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Gopichandra Surnilla
Life of this patent
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Abstract
Methods and systems are provided for improving fuel usage while addressing knock by adjusting the use of spark retard and direct injection of a fluid based on engine operating conditions and the composition of the injected fluid. One or more engine parameters, such as EGR, VCT, boost, throttle position, are coordinated with the direct injection to reduce torque and EGR transients.
Claims20
A method of operating an engine including a LP-EGR passage coupled between an engine intake upstream of a turbocharger compressor and engine exhaust downstream of a turbocharger turbine, comprising:
- during and in coordination with an increase in LP-EGR flow in the passage from a first amount to a second, higher, amount:
- increasing water injection to a first water injection amount, and then
- decreasing water injection to a second water injection amount lower than the first amount.
A method of operating an engine including a LP-EGR passage coupled between an intake upstream of a compressor and exhaust downstream of a turbine, comprising:
- during and in coordination with an increase in LP-EGR flow in the passage from a first amount to a second, higher, amount, and based on an increase in desired dilution:
- increasing water injection to a first water amount, and then
- decreasing water injection to a second, lower, water amount.
A method of operating an engine including a LP-EGR passage coupled between an engine intake upstream of a turbocharger compressor and engine exhaust downstream of a turbocharger turbine, comprising:
- during and in coordination with an increase in LP-EGR flow in the passage from a first amount to a second, higher, amount, and based on an increase in desired dilution:
- increasing water injection to a first water injection amount, and then
- decreasing water injection to a second water injection amount lower than the first amount;
- while
- adjusting a VCT based on the water injection amounts and further based on the LP-EGR flow.
Dependencies are inferred from the claim text.