| 摘要 |
A method for controlling canister purge of an internal combustion engine is disclosed. Based on a change rate of an air-fuel ratio correction coefficient per unit duty, a canister loading ratio is assumed by looking up a map. Further based on the canister loading ratio, a correction amount to the purge control duty for controlling the purge amount from the canister is determine. It is therefore possible to control a canister purge in accordance with the canister loading amount, whereby an over-loading of the canister can be prevented even under a high evaporation condition such as at extremely high temperatures or high altitudes. A deviation of the air-fuel ratio caused by the canister purge can be calculated, whereby an improvement in startability, driveability and emissions can be achieved by updating air-fuel ratio learning values with new learning values excluding a deviation of the air-fuel ratio caused by the canister purge.
|
