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    • 18. 发明授权
    • Blow-by gas passage abnormality detecting system for internal combustion engines
    • 内燃机吹气异常检测系统
    • US06338329B2
    • 2002-01-15
    • US09814046
    • 2001-03-22
    • Yoshinori MaegawaMasaaki Nakayama
    • Yoshinori MaegawaMasaaki Nakayama
    • F01M1300
    • F02D41/22F01M13/023F02M25/06Y02T10/40
    • A blow-by gas passage abnormality detecting system for an internal combustion engine detects, only under the condition that the running state of the engine is idle, a leakage of a blow-by gas coming from a blow-by gas passage for returning the blow-by gas produced in the engine to an intake passage, on the basis of a parameter varying with a change in the air flow to be sucked into the engine. The abnormality such as leakage or clogging in the blow-by gas passage is detected if the ISC opening of an idle speed control valve measured as a load amount at an idle time of the engine is smaller than a predetermined value. Alternatively, the abnormality may be detected by detecting the blow-by gas pressure in the blow-by gas passage downstream of a PCV valve by a gas pressure sensor.
    • 用于内燃机的窜气通道异常检测系统仅在发动机的行驶状态怠速的情况下检测来自用于返回吹气的窜气通道的窜气的泄漏 - 基于随着要吸入发动机的空气流的变化而变化的参数,在发动机中产生的气体到进气通道。 如果在发动机空转时测量为负载量的怠速控制阀的ISC开度小于预定值,则检测到窜气通道中的泄漏或堵塞等异常。 或者,可以通过气体压力传感器检测PCV阀下游的窜缸气体通道中的窜气压力来检测异常。
    • 19. 发明授权
    • Blow-by gas passage abnormality detecting system for internal combustion engines
    • 内燃机吹气异常检测系统
    • US06247464B1
    • 2001-06-19
    • US09593818
    • 2000-06-15
    • Yoshinori MaegawaMasaaki Nakayama
    • Yoshinori MaegawaMasaaki Nakayama
    • F01M1300
    • F02D41/22F01M13/023F02M25/06Y02T10/40
    • A blow-by gas passage abnormality detecting system for an internal combustion engine detects, only under the condition that the running state of the engine is idle, a leakage of a blow-by gas coming from a blow-by gas passage for returning the blow-by gas produced in the engine to an intake passage, on the basis of a parameter varying with a change in the air flow to be sucked into the engine. The abnormality such as leakage or clogging in the blow-by gas passage is detected if the ISC opening of an idle speed control valve measured as a load amount at an idle time of the engine is smaller than a predetermined value. Alternatively, the abnormality may be detected by detecting the blow-by gas pressure in the blow-by gas passage downstream of a PCV valve by a gas pressure sensor.
    • 用于内燃机的窜气通道异常检测系统仅在发动机的行驶状态怠速的情况下检测来自用于返回吹气的窜气通道的窜气的泄漏 - 基于随着要吸入发动机的空气流的变化而变化的参数,在发动机中产生的气体到进气通道。 如果在发动机空转时测量为负载量的怠速控制阀的ISC开度小于预定值,则检测到窜气通道中的泄漏或堵塞等异常。 或者,可以通过气体压力传感器检测PCV阀下游的窜缸气体通道中的窜气压力来检测异常。
    • 20. 发明授权
    • Abnormality detection apparatus for preventing fuel gas emission
    • 用于防止燃料气体排放的异常检测装置
    • US6082337A
    • 2000-07-04
    • US113281
    • 1998-07-10
    • Takeshi FujimotoMasaaki NakayamaYasuo MukaiHisayo DohtaKeiji WakaharaJunya MorikawaMakoto Miwa
    • Takeshi FujimotoMasaaki NakayamaYasuo MukaiHisayo DohtaKeiji WakaharaJunya MorikawaMakoto Miwa
    • F02M25/08F02M37/04
    • F02M25/0809
    • When a diagnosis execution condition is established, a canister closure valve is closed, thereafter, a purge control valve is opened, a purge control valve is closed in a state where negative pressure is introduced into an evaporated gas system to thereby maintain the evaporated gas system in a hermetically-sealed state and the hermetically-sealed state is continued until abnormality diagnosis is finished. Time period for maintaining the evaporated gas system in the hermetically-sealed state is divided into three time periods of a pressure change determining time period at a first time, an awaiting time period and a pressure change determining time period at a second time. After determining a pressure change amount DPT1 of the evaporated gas system in the pressure change determining time period at the first time, the evaporated gas system is successively maintained in the hermetically-sealed state, after the predetermined awaiting time period has elapsed, the pressure change determination at the second time is carried out by which a pressure change amount DPT2 of the evaporated gas system is determined. Further, presence or absence of leakage of the evaporated gas system is diagnosed by comparing the pressure change amount DPT1 at the first time with the pressure change amount DPT2 at the second time.
    • 当建立诊断执行条件时,关闭罐关闭阀,此后打开净化控制阀,在将负压引入蒸发气体系统中的状态下关闭净化控制阀,从而保持蒸发气体系统 在气密密封状态下,气密密封状态持续直到异常诊断完成。 用于将蒸发气体系统保持在气密密封状态的时间段被分为在第一时间的压力变化确定时间段,等待时间段和第二时间的压力变化确定时间段的三个时间段。 在第一次在压力变化确定时间段内确定蒸发气体系统的压力变化量DPT1之后,蒸发气体系统依次保持在气密密封状态,在经过预定的等待时间之后,压力变化 进行第二次的测定,确定蒸发气体系统的压力变化量DPT2。 此外,通过将第一次的压力变化量DPT1与第二次的压力变化量DPT2进行比较来诊断蒸发气体系统的泄漏的存在或不存在。