Engine valve operation
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Donald J. Lewis
Life of this patent
Estimating the term…
Abstract
Various approaches are described for operating an engine in a vehicle having variable valve operation for an intake and/or exhaust valve of the cylinder. In one example, a method comprises delivering a first fuel to a cylinder of the engine from a first injector; delivering a second fuel to the cylinder of the engine from a second injector, where a composition of at least one of the first or second fuels varies; and adjusting the variable valve operation responsive to the varying composition and further based on variation in the delivery of the first or second fuel.
Claims18
A method of operating an engine in a vehicle having variable valve operation for an intake and/or exhaust valve of the cylinder, the method comprising
- delivering a first fuel to a cylinder of the engine from a first injector;
- delivering a second fuel to the cylinder of the engine from a second injector, where a composition of at least one of the first or second fuels varies;
- and
- adjusting the variable valve operation responsive to the varying composition and further based on variation in the delivery of the first or second fuel, the adjusting including during a first condition with a first fuel composition, adjusting the variable valve operation to a first extent in response to a variation in an amount of the delivery of the first and second fuel;
- and during a second condition with a second fuel composition different than the first fuel composition, adjusting the variable valve operation to a second extent different than the first extent in response to the variation in the amount of the delivery of the first and second fuel.
A method of operating an engine having variable valve operation for an intake and/or exhaust valve of the cylinder, the method comprising
- delivering fuel to a cylinder of the engine from among at least a plurality of injectors including at least a first injector and a second injector, the first injector delivering a first fuel and the second injector delivering a second fuel, the first fuel having a quality differing from that of the second fuel;
- and
- adjusting the variable valve operation responsive to interactions between quality of at least one of the first fuel and second fuel, and relative distribution of an amount of the first fuel and an amount of the second fuel injected.
A system for an engine, comprising:
- a variable valve timing system for varying operation of an intake and/or exhaust valve of a cylinder of the engine;
- a port fuel injector coupled to the cylinder;
- a direct injector coupled to the cylinder;
- a controller for varying valve timing of the variable valve timing system responsive to a composition of fuel delivered via the direct injector, an amount of fuel delivered by the port injector, and an amount of fuel delivered by the direct injector, the controller further varying valve timing within a limit value, the limit value based on the composition of fuel delivered via the direct injector, the amount of fuel delivered by the port fuel injector, and the amount of fuel delivered by the direct injector.
Dependencies are inferred from the claim text.