Sheet type oxygen sensor and mounting and working modes thereof

Abstract

The invention relates to a sheet type oxygen sensor and mounting and working modes thereof. The sensor comprises a panel element, a protective hood and an air inlet window, wherein the sensor is characterized in that an oxygen sensor body is mounted on an exhaust passage which is 30-300mm far from an exhaust valve of an engine; exhaust gas of the engine flows around the panel element; a ventilating window is formed in a housing of the metal protective hood; the mounting direction of the panel element is parallel to the direction of an exhaust gas flow; the sensor body is heated by the exhaust gas of the engine and works. The sheet type oxygen sensor can be applied to automobiles, motorcycles, generators and other universal gasoline engine devices. The invention aims to provide the sheet type oxygen sensor which is reasonable in arrangement, low in cost and long in service life, and the reaction performance is improved; and moreover, the invention provides the mounting and working modes of the sheet type oxygen sensor.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an engine management system, in particular to an oxygen sensor for controlling the gas mixture concentration of a gasoline engine. Background technique [0002] The oxygen sensor is a key sensor to realize the feedback control of the engine air-fuel ratio. The installation method of the oxygen sensor plays a key role in the performance of the oxygen sensor, especially its service life and working efficiency. [0003] The sensing element of the oxygen sensor is called the oxygen sensor probe. The probe of the concentration type oxygen sensor for gasoline engine is mainly made of yttrium-containing zirconia material. Zirconia is a special electrolyte at high temperature. In the absence of oxygen, it can convert hydrocarbons and other substances in the exhaust gas into electromotive force. The engine controller can adjust the engine air-fuel ratio according to this elec...

AI Technical Summary

Problems solved by technology

However, the internal heating of the chip oxygen sensor probe is generated by very thin platinum wires. When the sensor is required to reduce the axial size and cost, the wires have to be made very thin, so that the consistency and reliability of the product will decrease, so How to make the chip oxygen sensor without self-heating work normally and shorten the light-off time is a topic worth exploring

[0004] The Chinese patent "Oxygen Sensor for Motorcycle Engine Air-Fuel Ratio Feedback Control" (Patent No.: 03240466.2) discloses a non-heating type installed on the cylinder of the exhaust pipe A utility model of the oxygen sensor, which is used to solve the problems of its cost, volume and design layout restrictions

In addition, due to the presence of a metal protective cover outside the oxygen sensor probe, the degree of contact between the hot air flow and the probe is reduced to a certain extent, thereby increasing the time required for the oxygen sensor to reach a normal working state. How to design the protective cover is also a key issue

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