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    • 1. 发明授权
    • Apparatus for detecting malfunction in evaporated fuel purge system used
in internal combustion engine
    • 用于检测内燃机中使用的蒸发燃料净化系统故障的装置
    • US5295472A
    • 1994-03-22
    • US998191
    • 1992-12-29
    • Takayuki OtsukaKouichi OsawaTatsumasa SugiyamaKatsuhiko TeraokaNobuyuki KobayashiKoji Okawa
    • Takayuki OtsukaKouichi OsawaTatsumasa SugiyamaKatsuhiko TeraokaNobuyuki KobayashiKoji Okawa
    • F02D41/00F02M25/08F02M33/02
    • F02M25/0809
    • A malfunction detecting apparatus for an evaporated fuel purge system includes a first control valve for controlling a flow of fuel vapor in a purge passage between a canister and an intake passage, a second control valve for controlling a flow of air from the atmosphere to the canister via an air inlet opening of the canister, a first control part for turning OFF the second control valve and for turning ON the first control valve during a first time period, so as to subject the purge passage, the canister, and a vapor passage to a negative pressure of the intake passage during the first time period, and a first discriminator for detecting whether or not a malfunction has occurred in the system, in accordance with a pressure change rate derived from pressures of the system sensed at a start of the first time period and at an end thereof. The apparatus further includes a second control part for detecting whether or not a pressure of the system reaches a prescribed negative pressure after it is detected that no malfunction has occurred in the system, and for turning OFF the first and second control valves during a second time period after the prescribed negative pressure is reached, and a second discriminator for detecting whether or not a malfunction has occurred in the system, in accordance with a pressure change rate derived from pressures of the system sensed at a start of the second time period and at an end thereof.
    • 用于蒸发燃料净化系统的故障检测装置包括:第一控制阀,用于控制罐和进气通道之间的净化通道中的燃料蒸汽的流动;第二控制阀,用于控制从大气到罐的空气流 通过所述罐的进气口,具有用于关闭所述第二控制阀并在第一时间段内接通所述第一控制阀的第一控制部件,以使所述清洗通道,所述罐和蒸汽通道经受 在第一时间段期间进气通道的负压,以及用于检测系统中是否发生故障的第一鉴别器,根据从第一时间段开始时感测到的系统的压力导出的压力变化率 时间段和结尾。 该装置还包括第二控制部件,用于在检测到系统中没有发生故障之后检测系统的压力是否达到规定的负压,并且在第二时间内关闭第一和第二控制阀 达到规定负压后的时间段,以及第二鉴别器,用于根据从第二时间段开始时感测到的系统的压力导出的压力变化率,以及在第二时间段开始时感测到的压力变化率来检测系统中是否发生故障 结束了。
    • 3. 发明授权
    • Air-fuel ratio control system for internal combustion engine having
improved air-fuel ratio-shift correction method
    • 具有改进的空燃比换档校正方法的用于内燃机的空燃比控制系统
    • US5423307A
    • 1995-06-13
    • US85571
    • 1993-06-30
    • Koji OkawaMitsuru TakadaNobuyuki Kobayashi
    • Koji OkawaMitsuru TakadaNobuyuki Kobayashi
    • F02D41/04F02D41/00F02D41/14F02D45/00F02M25/08F02M51/00
    • F02D41/0042
    • An air-fuel ratio control system for an internal combustion engine which includes an evaporative fuel purge system having a canister for temporarily storing fuel vapor, detects an air to fuel ratio in the exhaust gas from the engine. An air-fuel ratio controller controls the air-fuel ratio in exhaust gas from the engine by varying a fuel quantity supplied to the engine so that the air-fuel ratio approaches a predetermined target air-fuel ratio. The evaporated fuel is purged from the canister at a specific purging rate determined based on engine operating conditions. An air-fuel ratio-shift is controlled based on the derivation of an amount by which the air-fuel ratio has shifted from the target air-fuel ratio due to a cause independent of the purging operation. The first amount, which is relatively constant over time in comparison to a second amount of air-fuel ratio shift occurring as a result of the purging operation, is derived based on a first detected air-fuel ratio-shift amount when the purge system is purging at a first purging rate. The second air-fuel ratio-shift amount is detected when the purge system is purging at a second purging rate different from the first purging rate.
    • 一种用于内燃机的空燃比控制系统,包括具有用于暂时储存燃料蒸气的罐的蒸发燃料净化系统,检测来自发动机的废气中的空燃比。 空燃比控制器通过改变供给发动机的燃料量来控制来自发动机的废气的空燃比,使得空燃比接近预定的目标空燃比。 蒸发的燃料以基于发动机操作条件确定的特定净化速率从罐排出。 基于独立于清除操作的原因,基于空燃比已经从目标空燃比转移的量的推导来控制空燃比换档。 与作为清洗操作的结果发生的第二空燃比偏移量相比,与时间相对恒定的第一量基于当净化系统为第一检测空燃比移动量时 以第一次清洗率清洗。 当吹扫系统以与第一净化速率不同的第二净化速率吹扫时,检测第二空燃比转移量。