Adaptive Braking Impulse for Fuel Injection Actuator Noise Reduction
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Solution Overview
Problem
Existing fuel injection systems for internal combustion engines face challenges in reducing noise emissions due to variations in magnetic actuator efficiency caused by production tolerances and environmental factors, leading to inconsistent braking impulses that affect noise levels.
Innovation Solution
A method that adapts the braking impulse in electromagnetic activation devices by adjusting parameters such as the start, duration, and strength of the pulse width modulation (PWM) or current-controlled phases based on the efficiency of the actuator, supply voltage, and temperature, ensuring a later and weaker braking impulse in more efficient devices to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed braking impulse is used for all electromagnetic actuators, then the control is simple, but noise emissions increase due to variations in actuator efficiency
Solution Approach 1:
The braking impulse parameters (duration, strength, timing) are made dynamically adjustable based on the measured efficiency characteristics of individual electromagnetic actuators. The control device adapts the braking impulse in real-time to match each actuator's performance, thereby reducing noise emissions caused by impact while maintaining simple overall system architecture.
Solution Approach 2:
The invention changes the parameters of the braking impulse (duration, amplitude, timing) according to the measured efficiency of each electromagnetic actuator. By adjusting these parameters individually for each actuator, the system optimizes noise reduction without requiring complex hardware modifications, resolving the contradiction between control simplicity and noise emission reduction.
2Object-generated harmful factors
If the braking impulse is strengthened to reduce impact noise, then noise emissions decrease, but wear on components increases
Solution Approach 1:
The braking impulse parameters are precisely adjusted based on each actuator's efficiency characteristics. By optimizing the duration and strength of the braking impulse individually for each actuator, the system achieves effective noise reduction while minimizing excessive braking forces that would increase component wear, thereby maintaining reliability.
Solution Approach 2:
The system measures the efficiency of each electromagnetic actuator and uses this feedback information to adaptively adjust the braking impulse parameters. This closed-loop approach ensures that the braking impulse is optimized for each specific actuator, reducing noise emissions while preventing excessive wear through precise parameter control.
3Object-generated harmful factors
If individual adaptation of braking impulse is implemented for each actuator, then noise emissions are reduced, but measurement and control complexity increase
Solution Approach 1:
The electromagnetic actuator itself is used to measure its own efficiency characteristics during normal operation. The control device monitors the actuator's performance and automatically determines the optimal braking impulse parameters without requiring external measurement equipment or complex testing procedures, thereby reducing noise emissions while keeping the measurement and control process simple.
4Object-generated harmful factors
If production tolerances are reduced to ensure consistent actuator performance, then noise emissions decrease, but manufacturing costs increase
Solution Approach 1:
Instead of requiring tight production tolerances for electromagnetic actuators, the invention allows for normal manufacturing variations and then adapts the braking impulse parameters to compensate for these variations. This approach maintains noise emission reduction while avoiding the increased manufacturing costs associated with stricter tolerance requirements.
Solution Approach 2:
The system incorporates feedback measurement of each actuator's efficiency and automatically adjusts the braking impulse parameters accordingly. This compensates for production tolerances and performance variations without requiring expensive precision manufacturing, thereby reducing noise emissions while maintaining ease of manufacture and lower costs.
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 the impact speed of the valve element, minimizing noise emissions, scattering, and wear on components, while adhering to noise limits and reducing the risk of breakdowns without additional hardware costs.
Implementation Method 1
The well-known quantity control valve is implemented as a magnetic valve that is actuated electromagnetically by a magnetic coil
Implementation Method 2
The braking force reduces the speed, which reduces the impact noise
Data Source
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AI summary
In a fuel system (10) of an internal combustion engine, fuel is delivered into a fuel rail (18) by a high-pressure pump (16). The amount of the delivered fuel is influenced by an amount control valve (30), which is actuated by an electromagnetic actuating device (34). It is proposed that at least one parameter of a braking pulse of the electromagnetic actuating device (34) depend on an efficiency of the electromagnetic actuating device and/or on a supply voltage of a voltage source and/or on a temperature, particularly of a component of the fuel injection system (10) or of the internal combustion engine.