Binary Discharge Valve Control for Turbocharger Surge and Noise
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Solution Overview
Problem
Supercharged internal combustion engines experience significant discharge noise and compressor surge when the driver lifts their foot, leading to unstable operating conditions and potential damage to the turbocharger due to rapid valve opening in existing control methods.
Innovation Solution
A method for controlling a supercharged engine that uses pulse width modulation to apply a minimum voltage to the binary discharge valve during its opening stroke, allowing gradual opening and reducing the initial opening speed to minimize noise and prevent surge, while ensuring the compressor remains stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the binary discharge valve opens rapidly to relieve compressor pressure, then the compressor surge is eliminated, but significant discharge noise is generated
Solution Approach 1:
The patent applies dynamics by transitioning from a static binary valve (only fully open or fully closed) to a dynamically controllable valve that can operate in intermediate positions. The control unit modulates the voltage applied to the piezoelectric actuator, enabling the valve to open gradually at a controlled speed rather than snapping open instantly, thus reducing noise while maintaining surge prevention capability
Solution Approach 2:
The patent changes the operational parameter of the discharge valve from binary (open/closed) to continuous position control. By adjusting the voltage parameter applied to the piezoelectric actuator, the valve opening position and speed are precisely controlled, allowing the system to optimize between noise reduction and compressor protection
2Speed
If the throttle body closes rapidly upon foot lift, then the driver's demand is responded to quickly, but the compressor enters unstable pumping regime
Solution Approach 1:
The patent applies preliminary action by activating the discharge valve before the throttle body fully closes. The control unit detects the throttle closing event and提前 opens the discharge valve to provide an escape route for compressed air, preventing the pressure buildup that would cause compressor surge when the throttle restricts airflow
Solution Approach 2:
The discharge valve acts as an intermediary element between the compressor and the throttle body. It provides an alternative pathway for the compressed air, mediating the conflict between rapid throttle closure and compressor stability by allowing pressure relief without requiring the throttle to remain open
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 effectively reduces discharge noise and eliminates the risk of compressor surge by controlling the opening speed of the relief valve, maintaining engine stability and preventing damage to the turbocharger components.
Implementation Method 1
disinger un déplacement de l'élément piézoélectrique en modulant la tension fournie à cet élément
Data Source
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AI summary
The invention proposes a method for controlling a supercharged internal combustion engine of a motor vehicle in order to reduce as far as possible, even eliminate, the discharge noise in a binary discharge valve at the compressor intake of a compressor of the engine and the pumping in said compressor. On the basis of an event which represents the closing of a throttle housing, a computer of the engine applies to the terminals of the valve a minimum voltage capable of allowing the opening thereof and of imparting same a minimum opening speed, over at least the first portion of the travel of the binary valve. The minimum voltage is the result of modulating the pulse width of the constant DC voltage of the computer.