Patent ID: 8156920
Filing Date: 2012-04-17
Classification: F02D,Y02T

Abstract:
1. A method of transitioning an internal combustion engine, particularly a gasoline engine with direct gasoline injection and with a partially variable valve-train assembly, from an initial mode of operation into a target mode of operation, whereby the initial mode of operation and the target mode of operation are either a mode of operation with an externally-supplied ignition or one with self-ignition, the method comprising: adapting operating parameters of the initial mode of operation to required values for the target mode of operation in a map-based pilot control phase; changing from the initial mode of operation to the target mode of operation after the map-based pilot control phase; controlling in a closed-loop control the operating parameters after the changeover of modes of operation; and during a transition from a mode of operation with an externally-supplied ignition into one with self-ignition, lowering a gas temperature in a combustion chamber of the internal combustion engine in a map-based pilot control phase and retaining less residual gas.