Active Injector Vibration Damping for Wide-Frequency Noise Control
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Solution Overview
Problem
Conventional vibration damping methods for fuel injection systems in motor vehicles are limited to specific frequency ranges and do not effectively address noise reduction, especially when engine noise is perceived as undesirable during idling, particularly with increasing fuel pressure.
Innovation Solution
The implementation of actively controllable actuator elements, such as piezoelectric elements, integrated into a spring-mass damping system, allowing for adaptive stiffness and displacement changes to achieve effective vibration damping across wide frequency ranges, and enabling monitoring of system states for early detection of failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive insulating elements are used for vibration damping, then the structure is simple and reliable, but the frequency range of effective damping is limited
Solution Approach 1:
The patent applies the dynamics principle by using actively controllable actuator elements that can dynamically adjust their characteristics in real-time based on operating conditions. The actuator elements can be actively activated during operation to adapt to different frequency ranges, transforming the static passive damping system into a dynamic active system that responds to changing vibration conditions.
Solution Approach 2:
The patent implements parameter changes by modifying the physical state and characteristics of the actuator elements through active control. The controller adjusts parameters such as stiffness, damping coefficients, and natural frequencies of the actuator elements to match the varying operating conditions and target specific frequency ranges for effective vibration damping.
2Object-affected harmful factors
If actively controllable actuator elements are used, then damping effectiveness across wide frequency ranges is improved, but device complexity and control requirements increase
Solution Approach 1:
The patent applies feedback by implementing a controller that receives information about the operating state and vibration conditions, then actively adjusts the actuator elements accordingly. The controller enables closed-loop control where the system continuously monitors vibration levels and adapts the actuator characteristics to maintain optimal damping performance across different frequency ranges.
Solution Approach 2:
The actuator elements are designed with multi-functionality, serving both as mounting components for the metering valve and as active vibration damping actuators. This universal design allows the same component to perform multiple functions: structural support, positioning, and active vibration control, thereby reducing the need for separate dedicated damping components.
3Reliability
If multiple actively controllable actuator elements are provided for each metering valve, then optimal vibration reduction is achieved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent merges the actuator element with the holder structure, combining two previously separate components into a single integrated unit. The actuator element is arranged on the holder in such a way that it forms an integrated assembly, reducing the number of separate parts to be manufactured and assembled while maintaining the full vibration damping functionality.
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 enables targeted and effective damping of sound radiation, allowing for intelligent acoustic monitoring and early detection of potential failures, thereby reducing noise emissions and vibration loads more effectively than conventional passive measures.
Implementation Method 1
The actuator element is introduced in the form of a piezoelectric element between a lower housing shoulder of an injector and a step surface of a receiving bore for the injector in the cylinder head
Implementation Method 2
an actively controllable actuator element (3) which, during operation of the injection system, can be actively activated in order to reduce vibrations in the injection system, thereby damping noise emissions
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A vibration damping arrangement (1) for injection systems (2) of motor vehicles comprises an actively controllable actuator element (3) which is disposed on a component (5, 5') of the injection system (2). According to the invention, the actuator element (3) is disposed on the component (5, 5') in such a way that actively controlling the actuator element (3) allows vibrations on the injection system (2) to be reduced during operation of the injection system (2).