Patent ID: 6988396
Filing Date: 2006-01-24
Classification: F02M

Abstract:
1. An evaporated fuel treatment device of an internal combustion engine having a canister that adsorbs evaporated fuel generated in a fuel tank for treatment, comprising: a sealing valve that controls a communication state between said fuel tank and said canister; negative pressure introduction means that introduces negative pressure into said canister, with said sealing valve being closed; negative pressure time sealing valve opening means that issues a valve opening instruction to said sealing valve when canister side pressure is negative exceeding a negative pressure determination value; pressure change detection means that detects a change occurring in tank internal pressure or said canister side pressure between before and after the valve opening instruction to said sealing valve; opening failure determination means that determines whether said sealing valve opens under a condition where said sealing valve should be closed; and closing failure determination means that determines closing failure of said sealing valve, when there is no sign that said sealing valve opens in the state where said sealing valve should be closed, and the change occurring in said tank internal pressure or said canister side pressure between before and after the valve opening instruction to said sealing valve is below a predetermined determination value.