Patent ID: 6990962
Filing Date: 2006-01-31
Classification: F02M

Abstract:
1. An evaporative fuel control system for an internal combustion engine, comprising: a canister for absorbing evaporative fuel generated in a fuel tank, said canister being disposed on an evaporative fuel control passage that connects to an intake passage for the engine and the fuel tank; an atmosphere open passage which connects the canister with the atmosphere; a purge valve disposed between the intake passage for the engine and the canister; a purge controller configured to selectively control the purge valve so that the absorbed evaporative fuel is purged by the canister and supplied to the intake passage for the engine; and a leak check system for examining leakage in the evaporative fuel control system by generating negative pressure in the evaporative fuel control system when the engine is stopped; wherein said leak check system operates in a factory test mode when the evaporative fuel control system receives a factory test signal, said factory test mode having a leak check time that is shorter in duration than a leak check time for a normal leak check.