Patent ID: 7621257
Filing Date: 2009-11-24
Classification: F02D,Y02T

Abstract:
1. 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.