Mounting structure of oxygen sensor of motorcycle

Abstract

The invention discloses a mounting structure of an oxygen sensor of a motorcycle. The mounting structure comprises a motorcycle exhaust pipe connected with an engine cylinder head. The oxygen sensor is fixedly mounted on the surface of the outer circle of the exhaust pipe. A measuring head part of the oxygen sensor penetrates through the surface of the exhaust pipe and stretches into the exhaust pipe. The exhaust pipe is of a sectional structure, and all sections are fixedly combined into a whole. An independently formed special-shaped pipe is located at the bend at the end, close to the cylinder head, of the exhaust pipe, and the oxygen sensor is mounted on the special-shaped pipe. According to the design of the mounting structure, the layout of the exhaust pipe and the oxygen sensor is not limited by the bending process, and the problems of part layout interference and space insufficiency can be easily solved through the special-shaped pipe which is not in a specific regular shape; gaps between the oxygen sensor and surrounding parts are guaranteed, and the degree of freedom of the layout of the exhaust pipe and the oxygen sensor is higher.

Description

technical field [0001] The invention relates to an oxygen sensor installation structure of a motorcycle. Background technique [0002] For motorcycles using EFI systems, an oxygen sensor needs to be installed to detect the oxygen content in the exhaust system, so the oxygen sensor is often arranged in the engine exhaust passage. In most cases, the oxygen sensor is arranged on the exhaust pipe of the exhaust system, and the location of the arrangement will be chosen as close to the cylinder head as possible. During the process, the impact of sand and stones on the road surface will collide or damage it. On the other hand, because the oxygen sensor has high sensitivity to temperature, it needs to work normally and stably at high temperature. The closer the oxygen sensor is to the cylinder head The higher the ambient temperature, the shorter the response time of the oxygen sensor, and it can enter the closed-loop control of the EFI system as soon as possible to reduce the emis...

AI Technical Summary

Problems solved by technology

In most cases, the oxygen sensor is arranged on the exhaust pipe of the exhaust system, and the location of the arrangement will be chosen as close to the cylinder head as possible. During the process, the impact of sand and stones on the road surface will collide or damage it. On the other hand, because the oxygen sensor has high sensitivity to temperature, it needs to work normally and stably at high temperature. The closer the oxygen sensor is to the cylinder head The higher the ambient temperature, the shorter the response time of the oxygen sensor, and it can enter the closed-loop control of the EFI system as soon as possible to reduce the emission of pollutants; but usually, there are many parts around the cylinder head, and some models cannot The oxygen sensor at the cylinder head can only be installed at the rear end of the exhaust pipe, that is, the downstream side of the exhaust direction, and the ambient temperature will become unsatisfactory. In this case, only the expensive heating type oxygen sensor can be used.

It can be seen that it is very difficult to find a suitable location for a low-cost non-heated oxygen sensor around the cylinder head, and it must be possible to achieve it with the bending of the exhaust pipe.

[0003] In the prior art, the material of the exhaust pipe is usually a whole circular pipe. Due to the influence of the bending process, the pipe is not easy to be bent and formed in the part with a large curvature, and the shape of the pipe is a regular circle even if it can be bent. It is easy to interfere with nearby car body parts, resulting in that the exhaust pipe cannot obtain the ideal shape and the oxygen sensor cannot be arranged in the most suitable space. The expensive heated oxygen sensor is arranged at the place where the air pipe is far away from the cylinder head

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