Engine Combustion Pressure Sensor Noise Reduction
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Solution Overview
Problem
The existing pressure sensors for detecting combustion pressure in engines face issues with noise interference due to separate placement of sensing elements and electronic circuits, leading to deteriorated detection accuracy.
Innovation Solution
A pressure sensor design where the pressure detection unit, comprising a pressure detection element and a circuit unit, is positioned closer to the engine's combustion chamber than the contact part, reducing external noise influence and improving accuracy by integrating the elements on the same substrate and utilizing a stress absorbing part for strain reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing element and electronic circuit are disposed separately, then the device complexity is reduced and ease of manufacture is improved, but noise from outside is easily received in the wiring connecting them and detection accuracy is deteriorated
Solution Approach 1:
The patent merges the sensing element and electronic circuit into a single integrated unit disposed inside the engine. This integration eliminates the wiring connecting separate components, thereby preventing external noise interference while maintaining manageable device complexity through unified design.
2Reliability
If the pressure detection unit is positioned inside the engine, then external noise resistance is improved and detection accuracy is enhanced, but the device must operate in a high-temperature environment which increases operational challenges
Solution Approach 1:
The patent utilizes the engine casing as a heat dissipation structure, converting the potentially harmful high-temperature environment into a beneficial cooling mechanism. The casing acts as a heat sink that actively cools the integrated pressure detection unit, transforming the thermal challenge into an operational advantage.
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 a pressure sensor resistant to external noise with enhanced detection accuracy and temperature management, ensuring reliable combustion pressure measurement.
Implementation Method 1
a pressure detection element which detects the combustion pressure and outputs a signal
Data Source
AI summary
A pressure sensor which detects a combustion pressure of an engine includes: a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine; and a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure, wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine.