| 摘要 |
PURPOSE: An evaporated gas purifying method for vehicles is provided to prevent environmental pollution by reducing the amount of exhaust through complete combustion of evaporated gas introduced into an engine. CONSTITUTION: An engine control unit(30) initializes all variables, and detects the internal pressure of a fuel tank(10) to read a signal applied from an internal pressure detector(11). The engine control unit(30) reads a signal from an evaporated gas concentration detector(21). It is decided whether the internal pressure of the fuel tank(10) is larger than a set pressure. If the internal pressure is larger than the set pressure, a duty control signal is outputted to an actuator of a control valve(40). If the internal pressure is at the set pressure or less, the engine control unit(30) decides the concentration of evaporated gas collected in a canister(20). If the concentration of evaporated gas in the canister(20) is larger than a set concentration, the control unit(30) outputs a duty control signal to an actuator of a fuzzy control valve(40). The duty control signal activates the fuzzy control valve, and the engine control unit(30) returns to the initial stage.
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