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US 2018/0252197 A1Published application
Controlling variable compression ratio with a pressure-reactive piston
AssigneeFord Global Technologies, LLC
InventorChris Paul Glugla
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for adjusting an ignition timing of an internal combustion engine responsive to a biasing force of a pressure-reactive piston. In one example, an engine may include a pressure-reactive piston having a top wall biased away from a piston base by a pressure of gas contained within the base. An ignition timing of a combustion chamber including the piston is adjusted responsive to an estimated biasing force of the gas against the top wall.
Claims20
A method comprising:
- estimating a biasing force of a pressure-reactive piston disposed within a combustion chamber of an engine;
- and
- adjusting an operating parameter of the engine based on the estimated biasing force.
A method comprising:
- estimating a biasing force of a pressure-reactive piston disposed within a combustion chamber of an engine;
- and
- adjusting an ignition timing of the combustion chamber based on the estimated biasing force and an octane rating of fuel injected into the combustion chamber.
A system comprising:
- an engine including a combustion chamber and a spark plug disposed therein;
- a pressure-reactive piston disposed within the combustion chamber, the piston including a top wall movable relative to a base of the piston and positioned away from the base, the top wall biased away from the base by gas contained within the base;
- and
- a controller including computer-readable instructions stored in non-transitory memory for estimating a biasing force of the gas against the top wall and adjusting an electrical discharge timing of the spark plug responsive to the estimated biasing force.
1 more element
A method comprising:
- estimating a temperature of a mechanical biasing member disposed within a pressure-reactive piston;
- estimating a biasing force of the mechanical biasing member based on the estimated temperature;
- and
- adjusting an operating parameter of the engine based on the estimated biasing force.
1 more element
Dependencies are inferred from the claim text.