Patent ID: 6305362
Filing Date: 2001-10-23
Classification: F02D,F02M

Abstract:
In an evaporative emission control system for an internal combustion engine, including a first evaporative fuel passage for connecting a fuel tank and an intake system of said internal combustion engine, a first control valve provided in said first evaporative fuel passage for opening and closing said first evaporative fuel passage, first control means for controlling the opening degree of said first control valve so that the pressure in said fuel tank becomes lower than an atmospheric pressure, a second evaporative fuel passage for connecting said fuel tank and said intake system, a canister provided in said second evaporative fuel passage for temporarily storing evaporative fuel, a second control valve for opening and closing said second evaporative fuel passage, and second control means for controlling the opening degree of said second control valve; the improvement comprising:target pressure setting means for setting a target pressure in said fuel tank;tank pressure detecting means for detecting the pressure in said fuel tank; andthird control means for comparing said target pressure with said detected pressure in said fuel tank and controlling said first control means and said second control means according to the result of comparison between said target pressure and said detected pressure.