Oxygen sensor

Abstract

The invention discloses an oxygen sensor. The sensor comprises a sensor body, a connecting wire and a connector assembly, the sensor body comprises a sensing element lower protective cover, a bolt, asensor outer protective cover and an insulator. The connector assembly comprises a heat radiation prevention shell. A zirconium pipe is arranged in the sensor body; a spring is arranged on the side, away from the sensing element lower protective cover, of the zirconium pipe, a signal output wire is arranged on one side of the spring, the signal output wire is electrically connected with a connecting wire, the other end of the connecting wire is connected with a connector assembly, filter screens are arranged at the two ends of the sensor body, and the exterior of the sensor body is covered with a catalytic layer. The surface carbon deposition of the oxygen sensor can be reduced, meanwhile, dust and other sediments are prevented from entering the oxygen sensor, the accuracy of output signals of the oxygen sensor is improved, the service life of the oxygen sensor is prolonged, the investment cost is reduced, and good application prospects are achieved.

Description

technical field [0001] The present invention relates to the technical field of sensors, in particular to an oxygen sensor. Background technique [0002] In the control system of the automobile engine, ensuring that the engine works with the mixture of the best air-fuel ratio is a key technology for emission control. The vehicle oxygen sensor is a key component used to control the air-fuel ratio of the engine mixture. The oxygen sensor detects The oxygen content in the engine exhaust, the change of the oxygen concentration at both ends of the oxygen sensor chip will produce a voltage change in the oxygen sensor chip, and the oxygen concentration signal will be output to the engine's electronic control unit (ECU) through the lead wire of the oxygen sensor, and the ECU will respond accordingly. Adjust the fuel supply signal to make the engine work at the best air-fuel mixture ratio, that is, the best air-fuel ratio, and create conditions for the exhaust gas purification of the ...

AI Technical Summary

Problems solved by technology

As an important part of the emission control system, the oxygen sensor plays a pivotal role in closed-loop control, improving fuel consumption and EOBD diagnosis. Due to the poor combustion of the engine in the prior art, carbon deposits are formed on the surface of the oxygen sensor, or the oxygen sensor enters If there are deposits such as oil or dust, it will hinder or block the outside air from entering the oxygen sensor, making the signal output by the oxygen sensor inaccurate, and the ECU cannot correct the air-fuel ratio in time

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