Chamber Attenuates Intake Pulsation for Pressure Sensor Accuracy
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Solution Overview
Problem
Intake pulsation in internal combustion engines interferes with the detection of abnormalities in connection pipes by pressure sensors, due to fluctuations in pressure values caused by the pulsation, making it difficult to accurately monitor pipe conditions.
Innovation Solution
The internal combustion engine design includes a joint portion with a throttle portion and a chamber that mitigates intake pulsation effects on pressure sensors by attenuating pressure waves and separating oil and water, allowing for accurate detection of pipe abnormalities through a specific connection passage configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is connected to the joint portion to detect connection pipe abnormalities, then abnormality detection capability is improved, but pressure fluctuations due to intake pulsation interfere with accurate detection
Solution Approach 1:
The patent introduces a chamber as an intermediary component between the joint portion and the pressure sensor. This chamber serves as a buffer that decouples the direct connection, allowing the pressure sensor to measure static pressure without being directly exposed to dynamic intake pulsations. The chamber acts as a mediator that transmits pressure information while filtering out harmful pulsation effects.
Solution Approach 2:
The patent extracts the pressure sensing function from the direct flow path by placing the pressure sensor in a separate chamber that is connected to the joint portion through a connection passage. This separation removes the pressure sensor from the harmful intake pulsation environment while maintaining its ability to detect pressure changes indicative of connection pipe abnormalities.
2Reliability
If the connection pipe is disconnected or damaged, then abnormality detection is needed, but intake pulsation causes false pressure fluctuations that hinder proper detection
Solution Approach 1:
The chamber serves as a reliable intermediary that ensures accurate abnormality detection by isolating the pressure sensor from intake pulsations. This mediator provides stable pressure readings that reliably indicate connection pipe status without being contaminated by pulsation-induced false signals.
Solution Approach 2:
The patent converts the harmful effect of intake pulsation into a beneficial filtering effect by using the chamber's volume to dampen pressure fluctuations. The chamber's physical presence transforms the pulsation energy into harmless pressure variations that occur too slowly to interfere with abnormality detection.
3Object-affected harmful factors
If the first connection port and second connection port are positioned in the chamber, then intake pulsation propagation is reduced, but the chamber design adds structural complexity
Solution Approach 1:
The chamber performs multiple functions simultaneously: it serves as a buffer to reduce intake pulsation propagation, as a mounting structure for both the first and second connection ports, and as a protective enclosure for the pressure sensor. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent merges the functions of pulsation reduction, connection port positioning, and pressure sensing protection into a single integrated chamber structure. By combining these functions into one component rather than using separate elements, the design achieves pulsation mitigation without proportionally increasing system complexity.
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 effectively suppresses pressure fluctuations caused by intake pulsation, enabling reliable detection of connection pipe abnormalities and preventing oil and water from adhering to the pressure sensor, thus improving monitoring accuracy.
Implementation Method 1
the pressure wave that has propagated into the chamber through the first pipe is less likely to propagate to the second connection port
Implementation Method 2
a space between the throttle portion and the connection port of the joint portion serves as an oil separator that separates oil contained in the blow-by gas
Data Source
AI summary
An internal combustion engine includes a blow-by gas processing device. A cylinder head cover of the internal combustion engine is provided with a joint portion including a connection port to which a connection pipe is connected and a throttle portion having a passage sectional area smaller than a passage sectional area of the connection port. The joint portion is communicated with an inside of a cylinder head and a space in the joint portion serves as an oil separator. A pressure sensor is connected to the space in the oil separator via a connection passage. The connection passage includes a first pipe, a second pipe, and a chamber including a first connection port to which the first pipe is connected and a second connection port to which the second pipe is connected. The first connection port and the second connection port are open toward the same direction in the chamber.