Internal Combustion Engine Cylinder Pressure Detection via Shared Communication Path
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Solution Overview
Problem
In internal combustion engines with multiple cylinders in series, it is challenging to detect cylinder pressures effectively due to the limited space available for pressure sensors, leading to a need for a more efficient arrangement that reduces the number of sensors required.
Innovation Solution
A communication path is established between adjacent combustion chambers, with a pressure sensor disposed within this path, and check valves are used to control pressure flow, allowing for the detection of pressures by a smaller number of sensors while preventing pressure leakage between cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is disposed in each cylinder to detect cylinder pressure, then measurement precision is improved, but device complexity increases due to the larger number of sensors required
Solution Approach 1:
The patent merges the pressure detection function for multiple cylinders into a single pressure sensor by utilizing the communication path that connects adjacent combustion chambers. The sensor disposed in the communication path can detect pressure from both cylinders through the shared pathway, eliminating the need for separate sensors in each cylinder while maintaining detection capability.
Solution Approach 2:
The communication path acts as an intermediary medium that transmits pressure information from multiple combustion chambers to a single pressure sensor. This intermediary structure enables the sensor to indirectly measure pressure in both cylinders without being physically present in each chamber, resolving the contradiction between measurement coverage and sensor quantity.
2Measurement precision
If a pressure sensor is disposed in each cylinder to detect cylinder pressure, then measurement precision is improved, but the available arrangement space for sensors is reduced
Solution Approach 1:
The patent combines the detection function for multiple cylinders into a single sensor location within the communication path. This merging approach consolidates the sensor arrangement space requirement from multiple discrete locations into one shared space, effectively increasing the available arrangement space while maintaining comprehensive pressure detection capability.
3Reliability
If check valves are arranged in the communication path to control pressure flow, then reliability is improved by preventing pressure leakage, but device complexity increases
Solution Approach 1:
The check valves act as intermediary components within the communication path that selectively control pressure flow direction. These valves prevent harmful pressure leakage between cylinders while allowing the pressure sensor to accurately detect cylinder pressure, thereby improving reliability without requiring complex external control systems.
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 enables the detection of cylinder pressures using fewer sensors, ensures accurate pressure measurement, and simplifies the sensor placement and structure, allowing for efficient operation with a reduced number of pressure sensors.
Implementation Method 1
a communication path (50) through which combustion chambers (31L, 31R) of the cylinders (25L, 25R) adjacent to each other communicate with each other, wherein a pressure sensor (40) is disposed in the communication path (50)
Implementation Method 2
the check valves include a one-side check valve (55L) disposed on a side of one of the cylinders (25L), and an other-side check valve (55R) disposed on a side of the other of the cylinders (25R), the pressure sensor (40) is disposed between the one-side check valve (55L) and the other-side check valve (55R), the one-side check valve (55L) allows flow of a pressure from the one of the cylinders (25L) to the other of the cylinders (25R), and the other-side check valve (55R) allows flow of a pressure from the other of the cylinders (25R) to the one of the cylinders (25L)
Data Source
AI summary
In an internal combustion engine in which a plurality of cylinders are arranged in series in a cylinder section, pressures of the cylinders can be detected by a smaller number of pressure sensors. An engine in which a plurality of cylinders are arranged in series in a cylinder section includes a communication path through which combustion chambers of the cylinders adjacent to each other communicate with each other, and a pressure sensor is disposed in the communication path.