Turbo Diverter Valve Pressure-Differential Control for Lower Lag
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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 with a valve body and actuation mechanism that utilizes a chamber and valve member with differential surface areas to control the opening and closing of the diversion aperture, allowing pressurized gases to bypass into the atmosphere or a recirculation path, featuring a solenoid-activated control aperture and a return spring for precise pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a factory-fitted bypass valve is used to relieve pressure spikes during throttle closure, then pressure spikes and noise are reduced, but turbo lag increases due to evacuation of the entire intake tract volume
Solution Approach 1:
The bypass valve system dynamically adjusts the bypass aperture opening based on operating conditions. The valve member can be positioned at different angles to provide variable bypass areas, allowing the system to optimize between pressure relief and turbo lag reduction in real-time based on throttle position and boost pressure conditions
Solution Approach 2:
The system changes the bypass valve opening parameter dynamically. By adjusting the aperture opening from fully closed to partially open or fully open positions, the system can control the amount of bypass flow to achieve optimal balance between pressure spike reduction and maintaining intake tract pressure for reduced turbo lag
2Reliability
If the bypass valve is held open for extended periods to prevent pressure spikes, then pressure management improves, but turbo lag increases due to continuous evacuation of intake tract
Solution Approach 1:
The bypass valve operates with periodic opening and closing actions rather than remaining continuously open. The valve is opened briefly during throttle closure to relieve pressure spikes, then closed or partially closed to maintain intake pressure, creating a rhythmic operation pattern that balances pressure management with turbo lag reduction
3Speed
If a direct-actuated solenoid valve is used for precise control, then response time improves, but the valve suffers from premature failure and air leakage under high boost pressure and temperature
Solution Approach 1:
The system uses the existing intake tract pressure differential as an intermediary force to assist valve operation. The valve member is designed to utilize the natural pressure differences in the intake system to aid opening and closing actions, reducing the burden on the solenoid actuator and minimizing exposure to extreme pressure and temperature conditions
Solution Approach 2:
The bypass valve system uses the existing airflow and pressure conditions in the intake tract to assist in its own operation. The valve leverages the natural pressure differential created during throttle operations to drive valve opening and closing, reducing the need for high-force actuation and minimizing wear under extreme conditions
4Object-affected harmful factors
If the bypass valve opens completely to relieve pressure spikes, then pressure management improves, but turbo lag increases due to complete evacuation of intake tract volume
Solution Approach 1:
Instead of fully opening the bypass valve, the system uses partial opening to provide sufficient pressure relief without completely evacuating the intake tract. This partial action approach is sufficient to manage pressure spikes while retaining enough pressure to minimize turbo lag when the throttle is reopened
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 solution enhances the reliability and responsiveness of the diverter valve system, reducing turbo lag and maintaining performance under high boost pressures and temperatures, while simplifying installation and reducing costs by utilizing existing components.
Implementation Method 1
The vented air from the bypass valve is then directed back to the turbo compressor intake via another hose or duct, thus forming a bypass loop around the compressor. Newer implementations include a mounting flange built directly into the turbo's compressor cover, which includes separate paths for both the incoming pressure and the vented air to be recirculated in the one flange.
Implementation Method 2
The plunger and valve member is biased to the closed position by a spring. When the solenoid is energised, this pulls the plunger into the solenoid coil against the bias of the spring, and the valve member will thus open the diversion aperture.
Implementation Method 3
said valve member being configured so that by means of said pressurised gases, said valve member has a net force provided from a surface area differential with respect to opposite sides of said valve member so as to close said diversion aperture or keep it closed
Data Source
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).