Exhaust Gas Temperature Detection Using Indirect Sensor Placement
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Solution Overview
Problem
Conventional engine exhaust heat temperature detection devices require expensive high-temperature sensors due to direct exposure to exhaust gases, leading to increased costs and limited detection capabilities.
Innovation Solution
The exhaust gas temperature detection sensor is positioned outside the muffler or exhaust pipe, detecting atmosphere temperature increases based on temperature changes inside the muffler or exhaust pipe, allowing for temperature detection in a lower temperature region using less expensive sensors and providing early detection of abnormal temperature rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detection sensor is directly exposed to high temperature exhaust gas for temperature detection, then temperature detection capability is improved, but sensor cost increases due to requirement of heat-resistant materials
Solution Approach 1:
The patent introduces a heat-resistant member (intermediary) between the temperature detection sensor and the exhaust gas. This intermediary component absorbs the thermal stress and protects the sensor from direct exposure to high-temperature exhaust gas, allowing the use of less expensive sensors while maintaining detection capability.
Solution Approach 2:
The patent uses a temperature detection sensor that detects temperature indirectly through a heat-resistant member rather than directly measuring exhaust gas temperature. The sensor effectively 'copies' the temperature information through the intermediary component, avoiding the need for expensive high-temperature resistant sensors.
2Ease of manufacture
If a temperature detection sensor is placed outside the muffler to avoid high temperature exposure, then sensor cost is reduced, but temperature detection accuracy may be affected
Solution Approach 1:
The heat-resistant member acts as an intermediary that thermally couples the external sensor position to the high-temperature exhaust gas environment, allowing accurate temperature detection without direct sensor exposure to exhaust gas.
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 configuration reduces the cost of the temperature detection device by using less expensive sensors and ensures reliable detection of abnormal temperature increases without exposing the sensor to high-temperature exhaust gases, while maintaining detection accuracy.
Implementation Method 1
an increase in a temperature inside the muffler, or detects that an atmosphere temperature at a predetermined position outside the exhaust pipe has reached a predetermined temperature based on an increase in a temperature of an exhaust gas inside the exhaust pipe
Data Source
AI summary
An exhaust gas temperature detection sensor is arranged at a predetermined position outside a muffler, or at a predetermined position outside an exhaust pipe constituting an exhaust gas flow passage on a more downstream side than the muffler in an exhaust direction. The sensor detects that an atmosphere temperature at the predetermined position outside the muffler has reached a predetermined temperature based on an increase in a temperature inside the muffler, or detects that an atmosphere temperature at the predetermined position outside the exhaust pipe has reached a predetermined temperature based on an increase in a temperature of an exhaust gas inside the exhaust pipe.