Exhaust emission control system in internal combustion engine
    82.
    发明授权
    Exhaust emission control system in internal combustion engine 失效
    内燃机尾气排放控制系统

    公开(公告)号:US5564283A

    公开(公告)日:1996-10-15

    申请号:US314641

    申请日:1994-09-29

    摘要: In an exhaust emission control system in an internal combustion engine which includes a spark plug disposed to face a combustion chamber, an intake system having a fuel injection valve disposed therein, an exhaust system having a catalytic converter incorporated therein and filled with a catalyst for reducing nitrogen oxide (NO.sub.x) in the presence of hydrocarbons in an oxidizing atmosphere, and an exhaust gas circulation amount control means capable of measuring and controlling the amount of exhaust gas circulated from the exhaust system to the intake system. The amount of exhaust gas circulated by the exhaust gas circulation amount control means the amount and timing of fuel injected by the fuel injection valve and the timing of ignition of the spark plug are controlled by a control unit, so that the amount of NO.sub.x discharged, is detected by the NO.sub.x detector in the exhaust system at a location downstream from the catalytic converter, is equal to or less than an acceptable amount of NO.sub.x discharged which acceptable amount is set in accordance with the number of revolutions of the engine detected by a revolution-number detector as well as the engine load detected by a load detector. Thus, it is possible to control the concentration and type of hydrocarbons and the temperature of the catalyst to increase the elimination rate of NO.sub.x.

    摘要翻译: 在内燃机的废气排放控制系统中,其包括设置成面对燃烧室的火花塞,具有设置在其中的燃料喷射阀的进气系统,具有并入其中的催化转化器的排气系统,并填充有用于还原的催化剂 在氧化性气氛中的烃存在下的氮氧化物(NOx)和能够测量和控制从排气系统循环到进气系统的废气量的废气循环量控制装置。 由废气循环量控制装置循环的废气量由燃料喷射阀喷射的燃料的量和时间以及火花塞的点火时间由控制单元控制,从而排出的NOx量, 由排气系统中的NOx检测器在催化转化器下游的位置检测到,等于或小于根据由转速检测到的发动机的转数设定可接受量的NOx排放的可接受量 - 检测器以及由负载检测器检测到的发动机负载。 因此,可以控制烃的浓度和类型以及催化剂的温度来提高NOx的消除速率。

    Output correction method for exhaust gas ingredient-concentration sensors
    83.
    发明授权
    Output correction method for exhaust gas ingredient-concentration sensors 失效
    废气成分浓度传感器的输出校正方法

    公开(公告)号:US4926827A

    公开(公告)日:1990-05-22

    申请号:US338987

    申请日:1989-04-14

    申请人: Akira Kato Toru Yano

    发明人: Akira Kato Toru Yano

    IPC分类号: F02D41/14

    CPC分类号: F02D41/1441 F02D41/1456

    摘要: An output correction method for an exhaust gas ingredient-concentration sensor for internal combustion engines. The sensor has two sensor elements having output characteristics different from each other. The sensor elements each produce an output proportional to the concentration of an ingredient in exhaust gases emitted from the engine. The sensor controls the air-fuel ratio of a mixture supplied to the engine to a desired air-fuel ratio by the use of an output from at least one of the sensor elements. First, it is determined whether or not the difference between the desired air-fuel ratio and an actual air-fuel ratio represented by the output of at least one of the sensor elements is smaller than a predetermined value. Then, an output value of one of the sensor elements is corrrected based on an output value of the other of the sensor elements when it is determined that the difference is smaller than the predetermined value.

    摘要翻译: 一种用于内燃机的排气成分浓度传感器的输出校正方法。 该传感器具有两个具有彼此不同的输出特性的传感器元件。 传感器元件各自产生与发动机排放的废气中成分浓度成比例的输出。 传感器通过使用来自至少一个传感器元件的输出来将供给发动机的混合物的空燃比控制到期望的空燃比。 首先,确定由至少一个传感器元件的输出表示的期望空燃比与实际空燃比之间的差是否小于预定值。 然后,当确定差小于预定值时,基于传感器元件中的另一个的输出值来校正传感器元件之一的输出值。