Three-State Compressor Recirculation Valve Surge Control
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Solution Overview
Problem
Existing compressor recirculation systems face challenges in efficiently addressing both hard and soft surge conditions, leading to energy wastage, reduced fuel economy, and compromised torque responsiveness due to the limitations of conventional open/closed or fully variable valves.
Innovation Solution
A three-state compressor recirculation valve is maintained in a semi-open position during steady-state conditions, passively held by pre-loaded springs, and actively shifted to fully-open or fully-closed positions based on surge indications, using an external actuator to rapidly address hard surge and increase boost pressure during transient torque demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the compressor recirculation valve is kept closed during steady-state operation to reduce energy wastage, then fuel economy is improved, but the compressor is more prone to surge requiring frequent valve opening which consumes energy
Solution Approach 1:
The valve is designed with three distinct states (fully closed, semi-open, fully open) rather than binary open/closed positions, allowing dynamic adaptation to different operating conditions. The semi-open state provides a middle ground that maintains surge protection while minimizing energy consumption during steady-state operation.
Solution Approach 2:
The system changes the valve opening parameter to have three discrete positions instead of continuous or binary states. This parameter modification allows the valve to operate in a semi-open position during steady-state, reducing recirculation flow and energy consumption while still preventing surge.
2Reliability
If the compressor recirculation valve is opened to prevent surge during transient conditions, then surge is avoided, but torque responsiveness is degraded due to extended boost pressure recovery time
Solution Approach 1:
The valve is pre-positioned in a semi-open state during steady-state operation, maintaining a margin to the surge limit without being fully open. This preliminary positioning allows for faster response to transient surge events while preserving more boost pressure compared to starting from a fully closed position.
Solution Approach 2:
The three-state valve design enables dynamic transition between semi-open and fully-open states for surge protection, then rapid transition back to semi-open or fully-closed states for torque recovery, optimizing both surge prevention and responsiveness.
3Reliability
If the compressor recirculation valve is kept open to alleviate surge tendencies, then surge is prevented, but compressor boost pressure capability is reduced and fuel economy is degraded
Solution Approach 1:
Instead of keeping the valve fully open to prevent surge, the system uses partial opening (semi-open state) to provide sufficient surge protection while minimizing the impact on boost pressure generation and fuel economy.
Solution Approach 2:
The valve opening parameter is modified to include a semi-open position that provides optimal balance between surge protection and boost pressure maintenance, rather than using only fully open or fully closed positions.
4Reliability
If a conventional open/closed valve is used to address hard surge, then hard surge is effectively controlled, but soft surge during steady-state cannot be addressed equally well
Solution Approach 1:
The valve system transitions from static binary (open/closed) control to dynamic three-state control, enabling adaptation to different surge severity levels. The semi-open state specifically addresses soft surge conditions that occur during steady-state operation.
Solution Approach 2:
The valve control is segmented into three distinct states (fully closed, semi-open, fully open) that can be selectively applied based on the type and severity of surge condition, allowing differentiated response to hard surge versus soft surge.
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 approach reduces energy consumption, improves surge margin, and enhances torque responsiveness by maintaining the valve in a semi-open position during steady-state conditions, allowing for rapid transitions to fully-open or fully-closed positions as needed, thereby addressing both hard and soft surge effectively.
Implementation Method 1
The valve may be passively maintained in the semi-open position, without actuating an external actuator coupled to the valve, by a pair of opposing springs that are pre-loaded and pre-compressed.
Data Source
AI summary
Methods and systems are provided for improving a margin to surge. A compressor recirculation valve is held at a semi-open position during steady-state boosted engine operation and operation in a soft surge region. The valve is fully opened to reduce hard surge, or fully closed to meet a transient increase in boost demand.