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US 2015/0083080 A1Published application
Methods and systems for determining engine spark timing
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Gopichandra Surnilla
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Abstract
Systems and methods for providing spark to an engine are described. In one example, engine knock limited spark timing is expressed as a straight line that is determined in response to engine knock, spark timing, and engine load. The method and system described herein may be performed without extensive engine calibration and mapping.
Claims20
A method for adjusting engine spark timing, comprising:
- adjusting engine spark timing in response to an engine knock limited spark retard relationship interpolated from a plurality of engine knock limited spark retard versus engine load relationships.
A method for adjusting engine spark timing, comprising:
- adjusting engine spark timing in response to an engine knock limited spark retard relationship extrapolated from a plurality of engine knock limited spark retard versus engine load relationships.
A vehicle system, comprising:
- an engine;
- first and second fuel systems coupled to the engine, the first fuel system supplying a first fuel to the engine, the second fuel system supplying a second fuel to the engine, the first fuel different than the second fuel;
- and
- a controller including non-transitory instructions executable to adjust engine spark timing in response to an engine knock limited spark retard versus engine load relationship that is derived from two other engine knock limited spark retard versus engine load relationships.
1 more element
Dependencies are inferred from the claim text.