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US 8,127,745 B2Granted
Method and system for controlling fuel usage
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, John Nelson, Thomas G. Leone, Michael Howard Shelby, James Eric Anderson
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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 knock control 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, and CMCV, are coordinated with the direct injection to reduce torque and EGR transients.
Claims12
A method of operating an engine comprising,
- in response to engine knock, retarding ignition spark timing by a first amount and direct injecting a second amount of a fluid, the first amount of spark retard and the second amount of fluid injection adjusted based on a combination of inherent octane of the fluid, dilution effect of the fluid, and evaporation effect of the fluid.
A method of operating an engine comprising,
- in response to engine knock,
- retarding ignition spark timing;
- direct injecting an amount of knock control fluid, the amount adjusted based on a combination of a dilution effect, an inherent octane effect, and an evaporation effect of the injected fluid;
- and
- adjusting an engine operating parameter to thereby adjust an engine dilution based at least on the dilution effect of the injected fluid.
2 more elements
A method of operating an engine, comprising,
- in response to engine knock, retarding ignition spark timing up to a predetermined timing and direct injecting an amount of fluid, the predetermined timing and amount of fluid direct injected adjusted based on a molar composition of the injected fluid.
Dependencies are inferred from the claim text.