Turbo Diverter Valve Piston Geometry for Faster Boost Relief
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Solution Overview
Problem
Factory-fitted diverter valves in turbocharged vehicles suffer from inefficiencies such as premature failure, air leakage, and delayed response times due to their design limitations, particularly under increased boost pressure and temperature conditions, leading to suboptimal turbo lag and performance issues.
Innovation Solution
A diverter valve system featuring a piston with a transfer aperture and a control aperture, where the downstream surface area is at least 10-30% larger than the upstream surface area, and utilizing a return spring to control the piston's stroke length based on intake tract pressure, allowing for variable opening sizes and improved sealing, while retaining ECU control and using existing factory components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the downstream surface area of the piston is made larger than the upstream surface area, then the piston closes more reliably against pressure differential, but the valve opening area is reduced
Solution Approach 1:
The piston is designed with asymmetric surface areas where the downstream surface area is intentionally made larger than the upstream surface area. This asymmetry creates a pressure differential force that automatically pushes the piston toward the closed position, improving sealing reliability without requiring additional sealing mechanisms.
Solution Approach 2:
The invention changes the geometric parameter of the piston surface areas to optimize performance. By carefully selecting the ratio between upstream and downstream surface areas, the system achieves reliable closing while maintaining adequate opening area for airflow when needed.
2Speed
If a return spring is used to control piston stroke length, then the valve responds faster to pressure changes, but the device complexity increases
Solution Approach 1:
The return spring provides self-service by automatically returning the piston to its closed position when pressure differential decreases, eliminating the need for complex active control mechanisms. The spring's force naturally compensates for pressure changes, enabling fast response without additional actuators or control systems.
3Quantity of substance
If the piston is designed with a transfer aperture, then air flow is improved through the valve, but the sealing difficulty increases
Solution Approach 1:
The transfer aperture acts as an intermediary element that allows controlled airflow through the piston while maintaining sealing. The aperture's strategic placement and sizing enable air to pass through when the valve is open, while the pressure differential and return spring work together to ensure proper sealing when closed.
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 minimizes turbo lag, improves reliability, and reduces installation complexity and cost by providing faster operational speeds and enhanced performance under high boost and temperature conditions without requiring manifold vacuum or additional hoses.
Implementation Method 1
The actuator is a solenoid which uses electromagnetic force to move the valve member
Implementation Method 2
The piston is biased to the closed position by a return spring
Implementation Method 3
the downstream surface area is at least 10-30% larger than the upstream surface area
Data Source
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Figure 3
AI summary
Turbo or super charged intake tract diverter valve system, upstream of a throttle valve, includes a closure means (10) for a diversion aperture (4.1) in the intake tract (3) to vent pressurised gases within to a bypass path or atmosphere; the closure means having a transfer aperture ( 12) facilitating a net force due to a pressure differential on its opposite sides of the closure means (10) so as to close or keep closed the diversion aperture (4.1 ). When gas pressure on opposite sides of the closure means is equal, and when an upstream side ( 10.1) of the closure means (10) has a pressure greater than a downstream side (5.1), then it will open the diversion aperture (4.1 ). An actuation means opens a control aperture (6) to create the necessary pressure differential on the closure means (10) to thereby cause same to open the diversion aperture (4.1).