COOPERATIVE CAM PHASER AND AIR THROTTLE CONTROL

摘要

Methods and apparatus relate to air handling for an internal combustion engine system, particularly utilizing premixed air and fuel. The engine system includes an intake air throttle (IAT) having a position set in response to the engine speed and a variable valve timing module having an intake valve timing set in response to the engine load. The variable valve timing module may be a cam phaser having a position at or between full retard and full advance positions. The engine system may operate in a transient mode or a fuel efficiency mode. The IAT position is adjusted in response to an engine speed error value or set at full throttle. The cam phaser position is adjusted in response to a pressure difference across the IAT, the engine speed, or is set to a limit position.

主权项

1. A method of air handling for an engine system with premixed air and fuel upstream of at least one engine cylinder, comprising:
determining an engine speed and an engine load of the engine system, wherein the engine load is one of an actual engine load and a predicted engine load; setting an intake air throttle (IAT) position in response to the engine speed; and setting an intake valve timing in response to the engine load.