Fluid Duct Flap Control via Variable Radial Distance
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Solution Overview
Problem
Existing control systems for fluid duct flaps in internal combustion engines lack efficient opening and closing characteristics, particularly in terms of torque variation with flap position, leading to suboptimal operation and increased complexity.
Innovation Solution
A two-lever system where the rotation axis, connection axis, and swivel axis are parallel, with varying radial distances that change with the flap's opening/closing position, allowing for sinusoidal torque variation without the need for active elements, utilizing a return element to passively control the flap's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flap control system is used, then the structure is simple, but the opening and closing characteristics are suboptimal with insufficient torque variation
Solution Approach 1:
The patent applies the dynamics principle by making the lever arm length variable rather than fixed. The radial distance between the connection axis and working surface varies with the flap's opening/closing position, enabling dynamic torque adjustment. This variable geometry mechanism allows the system to achieve optimal opening and closing characteristics without requiring complex active actuators, thus improving reliability while maintaining relatively simple structure.
2Reliability
If active actuators and balancing weights are added to improve torque control, then the opening and closing characteristics improve, but the size and weight increase
Solution Approach 1:
The patent applies the self-service principle by designing a system that uses its own operational parameters (flap position) to automatically adjust the torque characteristics. The varying radial distance creates a self-regulating mechanism where the torque is naturally optimized at different flap positions without requiring external active actuators or balancing weights. This eliminates the need for additional heavy components while achieving superior torque control.
3Reliability
If active actuators are used to control the flap, then the opening and closing characteristics improve, but the system complexity and number of components increase
Solution Approach 1:
The system uses the flap's own position to automatically modulate the torque through the variable radial distance mechanism. This self-regulating approach eliminates the need for external sensors, actuators, and control systems that would otherwise be required to achieve optimal opening and closing characteristics, thereby maintaining simplicity while improving performance.
Solution Approach 2:
The patent changes the geometric parameter (radial distance) as a function of the flap's operational state. By making this physical dimension variable rather than constant, the system achieves dynamic torque control that adapts to different flap positions, improving opening and closing characteristics without adding complex active control components.
4Device complexity
If a fixed lever arm length is used, then the structure is simple, but the torque cannot vary with flap position
Solution Approach 1:
The patent transforms the static lever arm into a dynamic one by making the radial distance variable with respect to flap position. This allows the torque to be modulated automatically as the flap moves, achieving optimal power characteristics during opening and closing operations while maintaining a relatively simple mechanical structure without active control systems.
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 enables improved flap control with reduced size and weight, increased durability, and passive operation, minimizing the need for active actuators and balancing weights, while maintaining robustness and reliability.
Implementation Method 1
having at least one elastic working return element, which is connected directly or indirectly to the at least one swivel lever and which forces the at least one flap toward a home position
Implementation Method 2
an opening force caused by the fluid pressing against the at least one flap
Data Source
AI summary
A control system of at least one flap of a fluid duct of an intake system of an internal combustion engine, including: a swivel axis, at least one flap connected off-center to the swivel axis by which the at least one flap can be swiveled within the fluid duct between positions with different degrees of opening, a swivel lever connected to the swivel axis, the swivel lever pivoting the swivel axis, an elastic working return element connected directly or indirectly to the swivel lever and applying a force to the at least one flap to return the at least one flap toward a home position.