In-Cylinder Pressure Sensor Cooling Line for Combustion Heat
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Solution Overview
Problem
Existing pressure sensors in internal combustion engines are prone to damage from high temperatures and pressures due to their exposure in the combustion chamber, leading to reduced lifespan, and existing cooling solutions like the '807 publication may be costly or require engine modifications.
Innovation Solution
An engine system with an in-cylinder pressure sensor connected to an air intake system via a cooling line, utilizing a one-way check valve to draw cool air from the intake system to the sensor cavity during the intake stroke, reducing temperature and pressure through repeated combustion cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is placed in the combustion chamber to monitor pressure, then measurement capability is improved, but the sensor is exposed to high temperatures and pressures that damage or reduce its usable life
Solution Approach 1:
The combustion chamber is segmented into a sensor cavity and a combustion zone, with the pressure sensor housed in the cavity separated from the direct combustion environment by a partition wall, allowing pressure transmission while protecting the sensor from thermal and mechanical damage
Solution Approach 2:
A cooling air passage acts as an intermediary mechanism, introducing cool air from the intake manifold through the partition wall to the sensor cavity, thereby mediating between the hot combustion chamber and the sensor to reduce temperature and extend sensor life
2Temperature
If a cooling medium is introduced to cool the pressure sensor, then temperature reduction is achieved, but the system becomes more complex and costly
Solution Approach 1:
The cooling air passage serves multiple functions: it cools the pressure sensor, provides a pressure equalization path, and utilizes existing engine components (intake manifold, piston motion) without requiring separate cooling systems, thereby reducing overall device complexity
Solution Approach 2:
The system uses the engine's own intake air and piston motion to provide cooling automatically, with the piston's up-and-down movement creating pressure differentials that drive cool air through the cooling passage without requiring external cooling mechanisms
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
Effectively cools and reduces pressure around the in-cylinder pressure sensor, preventing damage and extending its usable life without requiring significant modifications to the engine.
Implementation Method 1
Movement of the piston during the intake stroke may cause a one way check valve to open in a cooling line system to draw air in from the air intake system to the sensor cavity
Implementation Method 2
The in-cylinder pressure sensor may be cooled or reduced in pressure by air drawn through a cooling line from the air intake system
Data Source
AI summary
An engine system includes an air intake system, an engine cylinder, a piston, an exhaust system, and an in-cylinder pressure sensor fluidly connected to the engine cylinder. The piston is movable within the engine cylinder during a combustion cycle, and the engine cylinder is fluidly connected to the air intake system via an intake port and an intake valve. The exhaust system is fluidly connected to the engine cylinder via an exhaust port and an exhaust valve. The in-cylinder pressure sensor is fluidly connected to the air intake system via an in-cylinder pressure sensor cooling line.