Water Temperature Sensor Installation on Cylinder Head Front Surface
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Solution Overview
Problem
The existing installation structure of water temperature sensors in engines faces challenges in attachability and sensing accuracy, particularly due to the narrow space around the cylinder head and the need for improved heat transfer for accurate temperature detection during cold engine startups.
Innovation Solution
The proposed installation structure positions the water temperature sensor adjacent to the outlet of the exhaust port on the front surface of the cylinder head, allowing for improved attachability and enhanced heat transfer through convection, which occurs early in the engine startup process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the water temperature sensor is installed at the rear surface of the cylinder head on the intake side, then the sensing accuracy can be improved, but the attachability deteriorates due to the narrow space surrounded by the vehicle body frame and intake components
Solution Approach 1:
The patent changes the installation dimension from the rear surface of the cylinder head to the front surface, utilizing the spatial dimension in front of the cylinder head that is less constrained by the vehicle body frame. This dimensional shift allows the sensor to be installed in a location with better accessibility while maintaining proximity to the cooling water flow path for accurate temperature sensing.
2Ease of operation
If the water temperature sensor is installed away from the exhaust port, then the attachability is improved, but the sensing accuracy during cold engine startup deteriorates due to delayed convection of cooling water
Solution Approach 1:
The patent applies local quality by creating a localized high-heat-transfer zone around the exhaust port outlet on the front surface of the cylinder head. The water temperature sensor is specifically positioned in this local region where hot exhaust gases directly heat the cooling water, ensuring early convection and accurate temperature sensing during cold startup, while the overall installation location remains accessible.
3Device complexity
If the space around the cylinder head is narrowed for vehicle body frame layout, then the vehicle structure is optimized, but the attachability of the water temperature sensor deteriorates
Solution Approach 1:
The patent resolves the spatial constraint by shifting the sensor installation from the rear dimension (which is constrained by the vehicle body frame) to the front dimension of the cylinder head. This allows the sensor to be installed in a location that is less affected by the narrowed space, maintaining attachability while preserving the optimized vehicle structure.
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 enhances the attachability of the water temperature sensor and improves its sensing accuracy during cold engine startups by facilitating early convection of cooling water around the sensor, thus addressing the limitations of existing technologies.
Implementation Method 1
Since high heat from the exhaust port is transferred to the cooling water at a location adjacent to the outlet of the exhaust port, convection of the cooling water occurs around the water temperature sensor at an early stage
Data Source
AI summary
An installation structure of a water temperature sensor configured to detect a temperature of cooling water in an engine is provided. In the installation structure, an outlet of an exhaust port is opened in a front surface of a cylinder head of the engine, and the water temperature sensor is provided at a location adjacent to the outlet of the exhaust port in a front view.