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发明授权
US5220898A Pressure control system for controlling pressure in fuel tank of engine by controlling discharging of evaporated fuel in fuel tank into canister 失效
通过控制燃料箱中的蒸发燃料排放到罐中来控制发动机燃油箱压力的压力控制系统

Pressure control system for controlling pressure in fuel tank of engine by controlling discharging of evaporated fuel in fuel tank into canister
摘要：
A pressure control device allows evaporated fuel evaporated in an fuel tank of an engine to be discharged to a canister during the engine running state. The canister absorbs the evaporated fuel. The pressure control device continues to allow evaporated fuel in the fuel tank to be discharged to the canister after the engine stops until a predetermined period has elapsed. The pressure control device allows evaporated fuel in the fuel tank to be discharged to the canister while a pressure in the fuel tank is higher than a first predetermined pressure after the predetermined period has elapsed in the engine stopped state. On the other hand, the pressure control device prevents evaporated fuel in the fuel tank from being discharged to the canister while a pressure in the fuel tank is lower than the first predetermined pressure after the predetermined period has elapsed in the engine stopped state.
摘要（中）：

压力控制装置允许在发动机运行状态期间在发动机的燃料箱中蒸发的蒸发燃料排出到罐。 罐吸收蒸发的燃料。 在发动机停止之后，压力控制装置继续允许燃料箱中的蒸发燃料排放到罐中，直到经过预定时间。 压力控制装置允许燃料箱中的蒸发燃料在发动机停止状态下经过预定时间之后，同时在燃料箱中的压力高于第一预定压力时排出到罐中。 另一方面，在发动机停止状态下经过规定期间后，压力控制装置能够防止燃料箱内的蒸发燃料排出到罐内，同时燃料箱内的压力低于第一规定压力。

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