Internal Combustion Engine Oil Separator Pulsation Mitigation
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Solution Overview
Problem
Existing internal combustion engine blow-by gas processing systems fail to accurately detect pipe disconnection or damage due to pulsation interference in pressure sensor readings, leading to inappropriate abnormality detection.
Innovation Solution
The system incorporates an oil separator with a partitioned sub-chamber configuration, where the pressure sensor is connected to a second sub-chamber via a communication hole, mitigating pulsation influence and allowing for accurate abnormality detection while minimizing space and reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is directly connected to the intake passage via the connection pipe, then the pressure value can be detected for abnormality detection, but the pressure value fluctuates due to pulsation propagation, making abnormality detection inaccurate
Solution Approach 1:
The joint portion is divided into multiple sub-chambers (first sub-chamber, second sub-chamber, third sub-chamber) separated by partition walls. The pressure sensor is connected to the third sub-chamber which is isolated from direct pulsation sources, while the first sub-chamber receives connection pipe input. This segmentation allows the system to detect pressure for abnormality detection while filtering out pulsation interference through the intermediate second sub-chamber.
Solution Approach 2:
The second sub-chamber acts as an intermediary chamber between the first sub-chamber (connected to intake passage) and the third sub-chamber (connected to pressure sensor). This intermediate structure mediates the pressure transmission, allowing pressure changes to be detected while attenuating the harmful pulsation effects before they reach the sensor.
2Measurement precision
If a pulsation mitigation structure is added to the joint portion, then the pressure value fluctuation is suppressed, but the device complexity increases
Solution Approach 1:
The joint portion is segmented into multiple sub-chambers using partition walls, creating a multi-compartment structure that inherently mitigates pulsation while maintaining a relatively simple overall design. Each sub-chamber serves a specific function in the pressure transmission and filtration process.
Solution Approach 2:
The joint portion structure serves multiple functions simultaneously: it connects the connection pipe to the intake passage, houses the pressure sensor, mitigates pulsation effects, and provides a compact integrated design. This multi-functionality reduces the need for separate pulsation mitigation components.
3Volume of stationary object
If the joint portion is compactly designed, then the space is minimized, but the pulsation mitigation capability is reduced
Solution Approach 1:
The multiple sub-chambers are nested within the joint portion in a compact arrangement, with partition walls creating separate compartments that fit together efficiently. This nesting approach allows sufficient volume for pulsation mitigation while keeping the overall joint portion size compact and space-efficient.
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 pulsations, enabling reliable detection of pipe abnormalities and reducing noise and vibration, while maintaining a compact design.
Implementation Method 1
A throttle portion connecting the sub-chamber to the main chamber
Implementation Method 2
A communication hole connecting the first sub-chamber and the second sub-chamber is provided in the partition wall
Data Source
AI summary
The internal combustion engine includes a second separator, a connection pipe, and a pressure sensor. Inside the second separator, a main chamber located in the cylinder head cover, and a first sub-chamber and a second sub-chamber located in a joint portion located outside the cylinder head cover are formed. The first sub-chamber and the second sub-chamber are partitioned by partition walls. A communication hole connecting the first sub-chamber and the second sub-chamber is formed in the partition wall. The first sub-chamber is connected to the main chamber via a throttle portion. A first connection port connected to the first sub-chamber and a second connection port connected to the second sub-chamber are formed in the joint portion. The first connection port is connected to the intake passage via a connection pipe. The second connection port is connected to the pressure sensor.