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    • 7. 发明授权
    • Exhaust gas purifying system for internal combustion engines
    • 内燃机排气净化系统
    • US4216653A
    • 1980-08-12
    • US868313
    • 1978-01-10
    • Takamichi NakaseTadashi HattoriJunichiro NaitoKenji Kondo
    • Takamichi NakaseTadashi HattoriJunichiro NaitoKenji Kondo
    • F01N3/22F01N3/10
    • F01N3/22Y02T10/22
    • An exhaust gas purifying system of the type utilizing a three-way catalyst containing an oxygen storage material includes an electronic control unit for controlling the amount of secondary air supplied to the exhaust system of an internal combustion engine. The electronic control unit receives a signal from an exhaust air-fuel ratio sensor indicative of an air-fuel ratio of the exhaust gases and provides a pulse signal to an electromagnetic valve disposed in the passage of the secondary air leading to the upstream of the three-way catalyst. The amount of secondary air supplied to the exhaust system is controlled such that the resultant exhaust gases having an exhaust air-fuel ratio greater than the stoichiometric ratio and those having an exhaust air-fuel ratio smaller than the stoichiometric ratio are alternately supplied to the three-way catalyst thereby to achieve the average exhaust air-fuel ratio to fall within the optimum purifying conditions of the three-way catalyst.
    • 使用含有储氧材料的三元催化剂的排气净化系统包括用于控制供给到内燃机的排气系统的二次空气量的电子控制单元。 电子控制单元接收来自表示排气的空燃比的排气空燃比传感器的信号,并且向设置在通向三通的上游的二次空气通过的电磁阀提供脉冲信号 - 催化剂。 控制供给到排气系统的二次空气的量​​,使得具有大于化学计量比的排气空燃比的合成排气和排气空燃比小于化学计量比的排气交替地供给到三 从而使平均排气空燃比落入三元催化剂的最佳净化条件。