https://www.jonyautoparts.com/products
Function
Sensor oksigen electric spray vehicle in order to obtain a high exhaust purification rate, reduce the exhaust (CO) carbon monoxide, (HC) hydrocarbons and (NOx) nitrogen oxides composition, must use three catalytic converters. However, in order to use the three-way catalytic converter effectively, the air-fuel ratio must be precisely controlled to make it always close to the theoretical air-fuel ratio. The catalytic converter is usually installed between the exhaust manifold and the muffler. The oxygen sensor has a characteristic of abrupt voltage changes near the theoretical air-fuel ratio (14.7:1). This characteristic is used to detect the oxygen concentration in the exhaust and feed back to the computer to control the air-fuel ratio. As the actual air-fuel ratio becomes higher, the oxygen concentration in the exhaust increases and the oxygen sensor informs the ECU of the thin state of the mixture (low ELECTROmotive force: O volts). When the air-fuel ratio is low theoretically, the concentration of oxygen in the exhaust decreases, and the status of the oxygen sensor (large ELECTROmotive force: 1 VOLT) informs (ECU) the computer.
ECU menentukan apakah rasio-bahan bakar udara rendah atau tinggi berdasarkan perbedaan gaya gerak listrik darisensor oksigen and controls the duration of the fuel injection accordingly. However, if the oxygen sensor is faulty and the output electromotive force is abnormal, the ECU computer cannot accurately control the air-fuel ratio. So the oxygen sensor can also compensate for the air fuel ratio error caused by mechanical and other parts of the efI system wear. It can be said that the only "intelligent" sensor in the EFI system.
The function of the sensor is to determine whether the information of excess oxygen in the exhaust after combustion of the engine, that is, oxygen content, and the oxygen content is converted into voltage signal to the engine computer, so that the engine can achieve the closed-loop control with excess air factor as the target; To ensure that the ternary catalytic converter has the maximum conversion efficiency of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOX) in the exhaust, to the maximum extent of the conversion and purification of emissions of pollutants.
Prinsip kerjanya
Sensor oksigen is the use of ceramic sensor measurement of all kinds of heating furnace and exhaust pipe the oxygen potential, which is calculated from chemical equilibrium principle corresponding oxygen concentration, to monitor and control in furnace combustion air-fuel ratio, to ensure product quality and the exhaust emission standards of the measuring element, is widely applied in all kinds of coal, oil, gas combustion, etc. The atmosphere in the furnace control. It is the best combustion gas fraction measurement method, has the advantages of simple structure, quick response, easy maintenance, convenient use, accurate measurement and so on. Using this sensor to measure and control combustion atmosphere can not only stabilize and improve product quality, but also shorten production cycle and save energy.
Sensor oksigen work in a similar way to dry cells, with zirconia acting as an electrolyte. Its basic working principle is: under certain conditions (high temperature and platinum catalysis), the use of zirconia on both sides of the oxygen concentration difference, the potential difference, and the greater the concentration difference, the greater the potential difference. The oxygen content in the atmosphere is 21 percent . The exhaust gas from the burning of the thick mixture actually contains no oxygen. The exhaust gas from the burning of the thin mixture or from the lack of fire contains more oxygen, but still much less than the oxygen in the atmosphere. Under high temperature and catalysis of platinum, negatively charged oxygen ions are adsorbed on the inner and outer surfaces of the zirconia casing. As there is more oxygen in the atmosphere than in the exhaust gas, the side connected with the atmosphere absorbs more negative ions than the side connected with the exhaust gas, and the difference in ion concentration on both sides generates electromotive force. When the oxygen concentration on the exhaust side of the casing is low, a high voltage (0.6-1V) is generated between the electrodes. This voltage signal is amplified by the ECU, which regards the high voltage signal as a thick mixture and the low voltage signal as a thin mixture. Based on the voltage signal from the oxygen sensor, the computer diluted or enriched the mixture as close as possible to a theoretical optimal air-fuel ratio of 14.7:1. Therefore, oxygen sensor is the key sensor for electronic control of fuel metering. Oxygen sensor only at high temperature (end reaches 300 degree or more) its characteristics can be fully reflected, in order to output voltage. It responds best to changes in the mixture at about 800 degree , and this property can change greatly at low temperatures.
Tegangan keluaran dari dua elektroda darisensor oksigen has a good correlation with the relative value of oxygen in the tail gas and oxygen in the atmosphere. However, the voltage is not linear with the oxygen content. The oxygen sensor is most sensitive near the optimal air{{0}}fuel ratio (a small change in the air-fuel ratio produces a large output voltage change) and is not sensitive when the air-fuel ratio is too thick or too thin. Low voltages correspond to high oxygen content, so a voltage output of 0.1-0.4 volts indicates a thin mixing ratio, while 0.6-1.0 volts represents a thick mixing ratio. When the output voltage of the oxygen sensor is 0.45 V, the air-fuel ratio is optimal.
