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    • 1. 发明授权
    • Evaporative fuel-processing system for internal combustion engines
    • 内燃机蒸发燃料处理系统
    • US5690076A
    • 1997-11-25
    • US609748
    • 1996-03-01
    • Akira HashimotoHideo MoriwakiYoshiaki MatsuzonoSachito FujimotoSatoshi Kiso
    • Akira HashimotoHideo MoriwakiYoshiaki MatsuzonoSachito FujimotoSatoshi Kiso
    • F02M25/08F02D41/00F02M37/04
    • F02M25/0809F02M25/08
    • An evaporative fuel-processing system for an internal combustion engine has an evaporative emission control system. An ECU carries out negative pressurization of the interior of the evaporative emission control system, by opening a purge control valve and closing a vent shut valve, and determines presence/absence of leakage from the evaporative emission control system, based on a rate of decrease in negative pressure within the system, by closing a purge control valve. Before the negative pressurization, the interior of the evaporative emission control system is opened to the atmosphere, and during the open-to-atmosphere, a pressure state within the fuel tank is estimated based on a rate of change in an output from a pressure sensor which senses pressure within the evaporative emission control system. The ECU determines whether the evaporative emission control system is normal, based on the estimated pressure state.
    • 用于内燃机的蒸发燃料处理系统具有蒸发排放控制系统。 ECU通过打开吹扫控制阀并关闭排气关闭阀来执行蒸发排放控制系统内部的负压,并且基于蒸发排放控制系统的减少速率来确定来自蒸发排放控制系统的泄漏的存在/不存在 通过关闭清洗控制阀,系统内的负压。 在负压之前,蒸发排放控制系统的内部向大气开放,并且在开放到大气中,基于来自压力传感器的输出的变化率来估计燃料箱内的压力状态 其感测蒸发排放控制系统内的压力。 基于估计的压力状态,ECU确定蒸发排放控制系统是否正常。
    • 2. 发明授权
    • Evaporative fuel-processing system for internal combustion engines
    • 内燃机蒸发燃料处理系统
    • US5678523A
    • 1997-10-21
    • US609744
    • 1996-03-01
    • Akira HashimotoHideo MoriwakiYoshiaki MatsuzonoSachito FujimotoSatoshi Kiso
    • Akira HashimotoHideo MoriwakiYoshiaki MatsuzonoSachito FujimotoSatoshi Kiso
    • F02M25/08F02M37/04
    • F02M25/0809
    • An evaporative fuel-processing system for an internal combustion engine has an evaporative emission control system and a pressure sensor. An ECU carries out negative pressurization of the interior of the evaporative emission control system, by opening a purge control valve and closing a vent shut valve. The purge control valve is closed over a predetermined time period after the interior of the evaporative emission control system is brought into the predetermined negatively pressurized state, and a rate of decrease in negative pressure within the evaporative emission control system is detected. Then, it is determined whether or not there is leakage from the evaporative emission control system, based on the detected rate of decrease in the negative pressure, and at least one detected pressure value at at least one predetermined time point within the predetermined time period over which the purge control valve is closed.
    • 用于内燃机的蒸发燃料处理系统具有蒸发排放控制系统和压力传感器。 ECU通过打开清洗控制阀并关闭排气关闭阀,对蒸发排放控制系统的内部进行负压。 在蒸发排放控制系统的内部进入预定的负压状态之后,在预定时间段内关闭净​​化控制阀,并且检测蒸发排放控制系统内的负压降低率。 然后,基于检测到的负压下降的速度来确定是否存在来自蒸发排放控制系统的泄漏,以及在预定时间段内的至少一个预定时间点的至少一个检测压力值 清洗控制阀关闭。
    • 3. 发明授权
    • Evaporative fuel-processing system for internal combustion engines
    • 内燃机蒸发燃料处理系统
    • US5732687A
    • 1998-03-31
    • US742902
    • 1996-11-01
    • Akira HashimotoHideo MoriwakiShigeto KashiwabaraSachito Fujimoto
    • Akira HashimotoHideo MoriwakiShigeto KashiwabaraSachito Fujimoto
    • F02D41/00F02D41/22F02M25/08F02M33/04F02M33/02
    • F02M25/0809F02M25/08
    • An evaporative fuel-processing system for an internal combustion engine includes a canister for adsorbing evaporative fuel generated in the fuel tank, a charging passage connecting between the canister and the fuel tank, a purging passage connecting between the canister and the intake system of the engine, an open-to-atmosphere passage for communicating the canister with atmosphere, a charge control valve for selectively opening and closing the charging passage, a purge control valve for selectively opening and closing the purging passage, and a vent shut valve for selectively opening and closing the open-to-atmosphere valve, and a pressure sensor inserted in the charging passage at a location on one side of the charge control valve closer to the fuel tank, for detecting internal pressure within the charging passage. When predetermined conditions are satisfied, the purge control valve is closed and the charge control valve and the vent shut valve are opened. It is determined that the vent shut valve is abnormal when the internal pressure detected by the pressure sensor is below a predetermined negative pressure value while the purge control valve, the charge control valve, and the vent shut valve are in the above respective states.
    • 用于内燃机的蒸发燃料处理系统包括用于吸附在燃料箱中产生的蒸发燃料的罐,连接在罐和燃料箱之间的充电通道,连接在发动机的罐和进气系统之间的净化通道 ,用于使气罐与大气连通的开放通气通道,用于选择性地打开和关闭充气通道的充气控制阀,用于选择性地打开和关闭吹扫通道的吹扫控制阀,以及用于选择性地打开和关闭吹扫通道的排气关闭阀, 关闭大气开放阀,以及压力传感器,该压力传感器插入到充电控制阀的靠近燃料箱的一侧的位置处的充电通道中,用于检测充电通道内的内部压力。 当满足预定条件时,清除控制阀关闭,并且打开充气控制阀和排气关闭阀。 当清洗控制阀,充气控制阀和排气关闭阀处于上述各自状态时,当由压力传感器检测到的内部压力低于预定负压值时,确定排气关闭阀异常。