汽车氧传感器的工作原理（The working principle of automobile oxygen sensor）.docVIP

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汽车氧传感器的工作原理（The working principle of automobile oxygen sensor）.doc

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汽车氧传感器的工作原理（The working principle of automobile oxygen sensor）

汽车氧传感器的工作原理（The working principle of automobile oxygen sensor） The working principle of automobile oxygen sensor The oxygen sensor is mounted on the exhaust manifold, which detects the concentration of oxygen in the exhaust gas, thereby calculating the air-fuel ratio and transmitting the results to the ECU. Such as: 1, high concentration of oxygen in exhaust gas When the percentage of oxygen in the exhaust gas is large, the ECU will determine the air-fuel ratio, i.e., the mixture is very thin. 2, the exhaust oxygen concentration is low When the percentage of oxygen in the exhaust gas is small, the ECU will judge the air-fuel ratio to be small, i.e., the mixture is very strong. A ceramic material used at temperatures above 300 DEG C and used as a conductor of iron oxides. Under these conditions, if the percentage of oxygen on both sides of the sensor is different, voltage changes occur at both ends. This change in the measurement of the different oxygen content in the two environments (air side and exhaust side) tells ECU that the remaining oxygen content in the exhaust gas is an unsuitable percentage for the generation of harmful waste gases that are responsible for combustion. The ceramic material is nonlinear at temperatures below 300 degrees Celsius, so the sensor does not deliver useful signals. ECU has a special function, that is, in the heating machine (open loop operation) to stop the adjustment of the mixture. The sensor is equipped with heating elements to achieve the operating temperature as soon as possible. When the current flows through the heating element, it shortens the time that the ceramic becomes the conductor of the iron, and allows the sensor to be mounted at the back of the exhaust pipe. In the three yuan catalytic converter, the ECU uses the data from the oxygen sensors to regulate the air-fuel ratio, but its method, the EFI device, and the standard carburetor vary somewhat. In the EFI unit, the EFI of the ECU regulates the air-fuel ratio by i