Vehicle Exhaust Gas Sensor Protection via Upstream Pipe Shielding
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Solution Overview
Problem
Conventional vehicle exhaust devices with exposed exhaust gas sensors are prone to damage from foreign matter like sand and mud during travel, as they lack protective members such as a cowl.
Innovation Solution
The exhaust device incorporates an exhaust passage formed by multiple units that cover at least a portion of the exhaust gas sensor from the front side, preventing collisions with foreign matter without the need for dedicated protective members, and allows flexible positioning of the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the exhaust gas sensor is exposed without protective members, then the sensor is easily accessible and the structure is simple, but the sensor is vulnerable to damage from foreign matter like sand and mud
Solution Approach 1:
The exhaust passage forming units serve dual purposes: they form the exhaust passage and simultaneously protect the exhaust gas sensor. The upstream units naturally extend to cover the sensor position, making the sensor protection a self-service function of the exhaust passage structure itself, eliminating the need for separate protective members
Solution Approach 2:
The exhaust passage forming units are designed to perform multiple functions: guiding exhaust gas flow and protecting the exhaust gas sensor. By positioning the upstream units to extend over the sensor, a single structural element fulfills both exhaust passage formation and sensor protection roles
2Reliability
If a dedicated protective member like a cowl is added to cover the sensor, then the sensor is protected from foreign matter, but the number of parts increases and device complexity increases
Solution Approach 1:
The protective function is merged with the exhaust passage forming units. Instead of adding a separate cowl or protective cover, the upstream exhaust passage units are positioned to extend over and cover the sensor, combining the protective function with the existing exhaust passage structure
Solution Approach 2:
The exhaust passage forming units serve themselves by extending to cover the sensor position. The same structural elements that form the exhaust passage also provide protection, making the system self-sufficient and eliminating the need for additional protective components
3Reliability
If the exhaust gas sensor is positioned to be protected by exhaust passage units, then protection from foreign matter is achieved, but the positioning flexibility may be constrained
Solution Approach 1:
The exhaust passage units are designed with varying extension lengths to provide localized protection. The upstream units extend further to cover the sensor position, while downstream units have different configurations. This local variation in structure allows protection while maintaining positioning flexibility
Data Source
AI summary
The vehicle exhaust device has an exhaust passage from an exhaust port of an engine body to an exhaust muffler provided behind the engine body, and the exhaust passage is formed by a plurality of exhaust passage forming units. The exhaust device includes an exhaust gas sensor attached to one of the exhaust passage forming units, such as a collecting pipe, halfway on the exhaust passage. At least a portion of the exhaust gas sensor is covered from a front side thereof with one of the exhaust passage forming units, such as an individual exhaust pipe, upstream of an attached position of the exhaust gas sensor.