The engine which use catalytic converters to reduce
exhaust pollution, oxygen sensor is an essential component.
As soon as the mixture of air-fuel ratio deviation from
stoichiometric, ternary catalyst on the CO, HC and NOx
purification capacity will drastically decrease， and installed
in the exhaust oxygen sensor to detect the concentration
of oxygen in the exhaust to the ECU send feedback signal,
and then controlled by the ECU Injector volume change,
which will control the mixture air-fuel ratio near the
theoretical value.
EFI car in order to obtain high exhaust purification rate
and reduce emissions of carbon monoxide (CO), hydrocarbons
(HC) and nitrogen oxides (NOx) components, must make use
of ternary catalysts. However, in order to effectively
use the ternary catalyst, must be accurately controlled
air-fuel ratio, it is always close to the theoretical
air-fuel ratio. Catalytic converters are usually installed
between the exhaust manifold and muffler. Oxygen sensor
has a characteristic, the output voltage have mutation
near the theoretical air-fuel ratio (14.7:1). This feature
is used to detect the concentration of oxygen in the exhaust
and back to the computer to control the air-fuel ratio.
When the actual air-fuel ratio higher or lower than the
theoretical air-fuel ratio, the exhaust oxygen concentration
increase or reduce the value of oxygen sensor to notice
ECU by potential or current signals.
Oxygen sensor is measurement devices which used measure
heater or exhaust pipe of oxygen current or electrical
potential difference using various types of ceramic
sensor, calculated oxygen concentration by the principle
of corresponding electrochemical, to monitor and control
the combustion air-fuel ratio, and ensure product quality
and exhaust Emission Standards, widely used to control
furnace atmosphere in various types of coal combustion,
oil combustion, gas combustion. It is the best way of
measuring the combustion atmosphere, has a simple structure,
fast response, easy maintenance, easy to use, measuring
accurate. Using the sensor tomeasure and control combustion
atmosphere， both stabilize and improve product quality,
and reduce the production cycle, saving energy.
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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。
