Intake Manifold Drain Assembly with Controlled Check Valve
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Solution Overview
Problem
Internal combustion engines face the challenge of oil accumulation in the intake manifold, which can lead to abnormal combustion issues like preignition when the accumulated oil is drawn into the combustion chamber during deep acceleration, as existing systems lack an effective mechanism to drain and recirculate oil at a controlled flowrate.
Innovation Solution
An intake manifold drain assembly is introduced, comprising a drain tube connected to the manifold chamber, an oil separator, and a controlled check valve that allows fluid to flow into the oil separator while controlling the flowrate below a threshold, preventing oil ingress into the combustion chamber and enabling continuous drainage of oil to the oil sump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oil is drained from the intake manifold without flow control, then oil removal efficiency is improved, but oil may be drained too quickly causing system instability or loss of lubrication
Solution Approach 1:
The check valve incorporates a flow control aperture that limits the maximum flow rate of oil from the intake manifold to the oil separator. This parameter control ensures oil is removed at a controlled rate rather than unrestricted flow, maintaining system stability while achieving effective oil removal.
Solution Approach 2:
The check valve acts as an intermediary device between the intake manifold and oil separator, mediating the oil flow to prevent both excessive drainage and complete blockage. It provides intermediate flow control that balances removal efficiency with system stability.
2Reliability
If a drain system is added to the intake manifold, then oil accumulation is prevented, but device complexity increases
Solution Approach 1:
The drain assembly is integrated into the existing intake manifold structure, with the drain tube connecting to the manifold chamber and the check valve incorporating both flow control and check valve functions in a single component. This merging approach adds drainage capability while minimizing overall system complexity.
Solution Approach 2:
The check valve serves multiple functions simultaneously: it allows oil to flow from the manifold to the separator, prevents backflow from the separator to the manifold, and controls the flow rate through its aperture design. This multi-functionality reduces the need for separate components.
3Quantity of substance
If oil is drained continuously at high flowrate, then oil level is maintained low, but energy loss increases and system efficiency decreases
Solution Approach 1:
The flow control aperture is designed to limit the flow rate to an optimal level that maintains adequate oil level in the manifold while minimizing energy loss. The aperture size is specifically calibrated to balance oil level control with energy efficiency.
Solution Approach 2:
The system uses the natural pressure differential and gravity to drive oil flow from the manifold to the separator without requiring additional energy input. The check valve passively controls flow based on pressure differences, eliminating the need for powered pumps or actuators.
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 system effectively prevents oil from entering the combustion chamber, maintaining a lower oil level in the manifold and allowing the drained oil to be reused without additional collection steps, thereby preventing abnormal combustion and ensuring efficient engine operation.
Implementation Method 1
a controlled check valve coupled to the drain tube and the oil separator and configured to allow fluid in the manifold chamber to flow into the oil separator and control a flow passing the controlled check valve below a threshold flowrate
Implementation Method 2
The WCAC's fins and plate can act as a separator to separate oil droplets from inlet air and oil droplets from PCV gas
Implementation Method 3
a drain tube connected to a bottom of a manifold chamber
Data Source
AI summary
An intake manifold drain assembly of an engine comprises a drain tube connected to a bottom of a manifold chamber; an oil separator connected to an engine block; and a controlled check valve connecting the drain tube to the oil separator and configured to allow liquid and gas in the manifold chamber to flow into the oil separator and control a gas flow passing the controlled check valve below a threshold flowrate.