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    • 5. 发明授权
    • Additional air supply system for an internal combustion engine
    • 内燃机附加供气系统
    • US4173957A
    • 1979-11-13
    • US802311
    • 1977-06-01
    • Tadashi HattoriAkira TakataTamotsu FukudaTakamichi Nakase
    • Tadashi HattoriAkira TakataTamotsu FukudaTakamichi Nakase
    • F02D41/14F02M7/00
    • F02D41/1482Y02T10/42
    • An additional air supply system for adjusting the air-fuel ratio of a mixture includes the improved control unit for actuating, at two different speeds, a drive motor of a bypass valve disposed in an additional air supply path. The control unit is provided with an air-fuel ratio discriminating circuit for generating high and low level signals by comparing a detected air-fuel ratio with the stoichiometric ratio, and an actuating circuit for producing pulse signals at each instant of inversion of the signal levels of the air-fuel ratio discriminating circuit in such that for a predetermined period from the instant of inversion a high frequency pulse signal is produced and then a low frequency pulse signal is produced for the remaining period until the next inversion. Since the pusle signals having two different frequencies are applied to the drive motor of the bypass valve, the bypass valve is drived at a fast speed to a predetermined amount of opening or closing and then moved slowly until the next inversion of the signal level.
    • 用于调节混合物的空燃比的另外的空气供应系统包括改进的控制单元,用于以两种不同的速度驱动设置在附加空气供应路径中的旁通阀的驱动马达。 控制单元设置有用于通过将检测到的空燃比与化学计量比进行比较来产生高电平和低电平信号的空燃比鉴别电路,以及用于在信号电平的每个反转时刻产生脉冲信号的致动电路 空燃比鉴别电路,在从反转时刻开始的规定期间,产生高频脉冲信号,然后产生低频脉冲信号,直至下一次反转为止。 由于具有两个不同频率的消息信号被施加到旁通阀的驱动电动机,旁通阀以快速的速度被驱动到预定的开启或关闭量,然后缓慢地移动直到信号电平的下一个反转。
    • 10. 发明授权
    • Air flow amount adjusting system for an internal combustion engine
    • 用于内燃机的空气流量调节系统
    • US4285319A
    • 1981-08-25
    • US91755
    • 1979-11-06
    • Tadashi HattoriAkira TakataTamotsu FukudaTakamichi Nakase
    • Tadashi HattoriAkira TakataTamotsu FukudaTakamichi Nakase
    • F02B1/04F02D41/14F02D1/04
    • F02D41/1481F02B1/04
    • An air flow amount adjusting system produces an air-fuel mixture of a desirable air-fuel ratio by controlling the direction of movement of a bypass valve mounted in an additional air supply pipe adapted to supply additional air into either the intake system or exhaust system of an internal combustion engine in accordance with an output signal produced from a gas sensor mounted in the exhaust system of the engine and indicative of the air-fuel ratio of the mixture supplied to the engine. A two-level mode signal whose threshold corresponds to the desired air-fuel ratio is produced in accordance with the output signal of the gas detector. After the two-level mode signal has changed from one level to the other level, the movement of the bypass valve is stopped for a certain period of time. If desired, the stopping period of the bypass valve may be changed in accordance with the temperature of the engine.
    • 空气流量调节系统通过控制安装在附加空气供应管中的旁通阀的运动方向来产生期望空燃比的空气 - 燃料混合物,该附加空气供应管适于将额外空气供应到进气系统或排气系统 根据从安装在发动机的排气系统中的气体传感器产生的输出信号的内燃机,其指示供应给发动机的混合物的空燃比。 根据气体检测器的输出信号产生阈值对应于所需空燃比的两电平模式信号。 在双电平模式信号从一个电平变化到另一个电平之后,旁路阀的运动停止一段时间。 如果需要,可以根据发动机的温度来改变旁通阀的停止时段。