Exhaust Pressure Sensor Cooling via Cylinder Head Bypass Path
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Solution Overview
Problem
Traditional engine devices with exhaust pressure sensors face challenges in maintaining sensor reliability due to heat issues, leading to complex pipe layouts and reduced manufacturability within limited spaces.
Innovation Solution
An engine device design where the exhaust pressure sensor is attached to the cylinder head, connected through an exhaust pressure bypass path, and a cooling water passage is provided nearby, allowing for efficient heat dissipation and pipe length reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pipe length is increased to cool the exhaust pressure sensor, then the sensor temperature is reduced to acceptable ranges, but the layout becomes complex and space requirements increase
Solution Approach 1:
An exhaust pressure bypass path is introduced as an intermediary channel that allows exhaust pressure to be detected without requiring the sensor to be positioned in the hot exhaust manifold. The bypass path routes exhaust gas away from the sensor location, enabling temperature reduction without excessive pipe length while maintaining pressure detection accuracy
2Reliability
If the pipe length is increased to protect the sensor from heat, then the sensor reliability is improved, but the manufacturability and assemblability are deteriorated
Solution Approach 1:
The exhaust pressure bypass path serves as a mediator that protects the sensor from thermal damage while minimizing pipe length. By routing exhaust gas through a separate bypass channel rather than requiring a long detection pipe, the system achieves sensor protection without compromising manufacturability or assembly ease
3Volume of moving object
If the pipe is bent in a complex shape to fit limited space, then the space constraint is satisfied, but the reliability is lowered
Solution Approach 1:
The exhaust pressure detection system is segmented into two separate functions: the exhaust manifold handles hot exhaust gas flow, while the bypass path handles pressure detection. This segmentation allows each component to be optimized independently, with the bypass path being a simple, reliable channel that doesn't require complex bending to fit space constraints
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances sensor reliability, simplifies pipe arrangement, and improves manufacturability by maintaining heat within acceptable ranges, reducing the risk of sensor failure and simplifying the design process.
Implementation Method 1
a cooling water passage is provided nearby the exhaust pressure bypass path, in the cylinder head
Data Source
AI summary
An engine device including an exhaust manifold provided on an exhaust side surface of a cylinder head, and an exhaust pressure sensor configured to detect an exhaust gas pressure in the exhaust manifold. The exhaust pressure sensor is attached to the cylinder head. The exhaust pressure sensor is connected to the exhaust manifold through an exhaust pressure bypass path provided in the cylinder head and an exhaust pressure detection pipe connecting the exhaust pressure bypass path to the exhaust manifold. A cooling water passage is provided nearby the exhaust pressure bypass path, in the cylinder head.