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Oxygen sensor profile and its role
time2011/11/29
In the use of catalytic converters to reduce exhaust pollution engine, oxygen sensor is an essential component. As soon as the mixture of the deviation from the stoichiometric air-fuel ratio, three-way catalyst for CO, HC and NOx purification ability of the sharp decline, it is installed in the exhaust oxygen sensor to detect the concentration of oxygen in the exhaust to the ECU feedback signal, controlled by the ECU injector fuel injection amount of increase or decrease, thus the mixed gas air-fuel ratio control in the vicinity of the theoretical value.
Oxygen sensor role
EFI car exhaust purification to obtain a high rate, reducing the exhaust (CO) carbon monoxide, (HC) and hydrocarbons (NOx) components of nitrogen oxides, catalytic converters must be used. However, in order to effectively use catalytic converters, air-fuel ratio must be precisely controlled, it is always close to the theoretical air-fuel ratio. Catalytic converter is usually installed between the exhaust manifold and muffler. Oxygen sensor has a characteristic, in stoichiometric (14.7:1) the output voltage close to its mutation. 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 becomes higher, the concentration of oxygen in the exhaust oxygen sensor increase in the state of the dilute mixture (small electromotive force: O V) notify ECU. When the air-fuel ratio lower than the theoretical air-fuel ratio when the concentration of oxygen in the exhaust to reduce, and the state of the oxygen sensor (large electromotive force: 1 V) Notification (ECU) computer.
ECU according to the electromotive force from the oxygen sensor to determine the difference between low and high air-fuel ratio, and the corresponding control fuel injection duration. However, if the oxygen transfer is faulty so that the output of the electromotive force is not normal, (ECU) computer can not be precisely controlled air-fuel ratio. Therefore, the oxygen sensor can compensate for the other pieces of machinery and electronic injection system wear and tear caused by air-fuel ratio error. EFI system can be said that the only "smart" sensors.
Oxygen sensor role
EFI car exhaust purification to obtain a high rate, reducing the exhaust (CO) carbon monoxide, (HC) and hydrocarbons (NOx) components of nitrogen oxides, catalytic converters must be used. However, in order to effectively use catalytic converters, air-fuel ratio must be precisely controlled, it is always close to the theoretical air-fuel ratio. Catalytic converter is usually installed between the exhaust manifold and muffler. Oxygen sensor has a characteristic, in stoichiometric (14.7:1) the output voltage close to its mutation. 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 becomes higher, the concentration of oxygen in the exhaust oxygen sensor increase in the state of the dilute mixture (small electromotive force: O V) notify ECU. When the air-fuel ratio lower than the theoretical air-fuel ratio when the concentration of oxygen in the exhaust to reduce, and the state of the oxygen sensor (large electromotive force: 1 V) Notification (ECU) computer.
ECU according to the electromotive force from the oxygen sensor to determine the difference between low and high air-fuel ratio, and the corresponding control fuel injection duration. However, if the oxygen transfer is faulty so that the output of the electromotive force is not normal, (ECU) computer can not be precisely controlled air-fuel ratio. Therefore, the oxygen sensor can compensate for the other pieces of machinery and electronic injection system wear and tear caused by air-fuel ratio error. EFI system can be said that the only "smart" sensors.