Temperature Sensor Mounting for Portable Engine Responsivity
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Solution Overview
Problem
Portable working machines, such as chain saws and brush cutters, face challenges in accurately detecting engine temperature for efficient electronic control, requiring improved temperature sensor responsiveness and reduced assembly and replacement complexity, while preventing accidental wire disconnection.
Innovation Solution
An air-cooled engine with a temperature sensor component featuring a heat transfer terminal and a fixing member, mounted to the cylinder block, allowing for responsive temperature detection and easy assembly/replacement, with the sensor positioned close to the control unit to minimize wire interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is mounted on the cylinder head using a complex mounting structure, then the temperature detection accuracy is improved, but the assembly and replacement complexity increases
Solution Approach 1:
The temperature sensor component is separated into an independent module that can be mounted on the cylinder head without requiring complex integration with other components. This modular approach simplifies the mounting structure while maintaining detection accuracy.
Solution Approach 2:
The mounting part is pre-formed on the cylinder head with appropriate positioning features, eliminating the need for complex assembly procedures. The sensor component is designed to be directly mounted on this pre-prepared mounting part.
2Measurement precision
If the temperature sensor is positioned far from the control unit, then the sensor can be optimally positioned for temperature detection, but the wire length increases and accidental disconnection risk increases
Solution Approach 1:
The control unit is positioned in close proximity to the temperature sensor on the cylinder head, utilizing the three-dimensional space available on the engine. This spatial arrangement minimizes wire length while maintaining optimal sensor positioning for temperature detection.
3Reliability
If the temperature sensor component requires secure fixing to prevent accidental disconnection, then the connection reliability is improved, but the assembly process becomes more complex
Solution Approach 1:
The fixing member is integrated with the mounting part structure, combining the mounting and fixing functions into a single integrated component. This eliminates the need for separate fixing operations while ensuring reliable sensor attachment.
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
The solution provides excellent temperature responsivity and simplifies assembly and maintenance by ensuring the temperature sensor is easily accessible and securely connected, reducing the risk of accidental disconnection.
Implementation Method 1
a temperature sensor component (40) including a heat transfer terminal, the temperature sensor component detecting the engine temperature
Data Source
AI summary
To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor component 40 includes a metal washer 42. The temperature sensor component 40 transfers the engine temperature to a sensor body 46 via the heat transfer washer 42. A cylinder portion 8 of a cylinder block 64 has two bosses 30. The washer 42 of the temperature sensor component 40 is fixed to the boss 30 together with the electronic control unit 20.