Stock Name: Tianhao Technology Stock Code: 872304
PRODUCT
Product classification
Oxygen Sensor
在使用三元催化转换器以减少排气污染的发动机上，氧传感器是必不可少的元件。由于混合气的空燃比一旦偏离理论空燃比，三元催化剂对CO、HC和NOx的净化能力将急剧下降，故在排气管中安装氧传感器，用以检测排气中氧的浓度，并向ECU发出反馈信号，再由ECU控制喷油器喷油量的增减，从而将混合气的空燃比控制在理论值附近。 前后两个氧传感器只是作用不同而已。前氧传感器的作用就是在“闭环控制”的时候，向发动机电脑反馈排放废气中氧含量，发动机电脑根据此信号修正喷油量。 后氧传感器安装在三元催化转换器的后方，后氧传感将三元催化转换器后方的氧含量反馈给发动机电脑，发动机电脑将两个氧传感器的信号进行对比，正常情况下前氧传感器的信号高于后氧传感器，如果两个氧传感器的信号相同，证明三元催化转换器失效。
Classification:
Sensors
Product Description
Oxygen sensor is mandatory in application of catalyst to optimize exhaust. When air-fuel ratio of mixed air is off 14.7 to 1, the purification ability of catalyst to CO, HC, and NOX will decrease, so oxygen sensors are installed inside exhaust pipe to check the concentration of oxygen, and send the feedback signal to ECU, then ECU will control petrol injection to make sure the air-fuel ratio is near 14.7 to 1.
Usually there are two oxygen sensors installed, one is in front of catalyst called upstream oxygen sensor, and the other is at the back of catalyst called downstream oxygen sensor. Upstream oxygen sensor checks the concentration of oxygen in exhaust and send the signal to ECU, ECU will then adjust dosage of petrol injection; downstream oxygen sensor also checks the concentration of oxygen after catalyst, and send the signal to ECU, ECU will then compare the two signals sent from upstream sensor and downstream sensor, normally, the signal from upstream sensor should be higher than that of downstream sensor, if the two signals are the same, that means the catalyst may have failed.
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苏州天浩
SUZHOU TIANHAO
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