Patent ID: 6082338
Filing Date: 2000-07-04
Classification: F02D,F02M,Y02T

Abstract:
An evaporated fuel treatment device for an internal combustion engine, comprising:a variable valve timing mechanism that varies the open/close timing of at least an intake valve among the intake valve and an exhaust valve of the internal combustion engine;operation state detecting means for detecting the operation state of said internal combustion engine;drive control means for calculating the amount of valve overlap of said intake valve and said exhaust valve on the basis of a detection result of the operation state detecting means to control the drive of said variable valve timing mechanism according to the amount of the calculated valve overlap;purge executing means for purging the fuel vapor discharged from a fuel system of said internal combustion engine to an inlet passage in response to an operating state of the internal combustion engine;fuel vapor increase tendency detecting means for detecting before or during execution of purge by the purge executing means a parameter indicative that the amount of generation of the fuel vapor discharged from said fuel system tends to increase, among parameters indicative of the operation state detected by said operation state detecting means; andvalve overlap amount correcting means for correcting the amount of valve overlap calculated by said drive control means according to the parameter detected by the fuel vapor increase tendency detecting means.