Solenoid Valve Current Adaptation for Premature Closure
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Solution Overview
Problem
Solenoid valve injectors in internal combustion engines face premature closure due to aging effects, deposits, and increased fuel viscosity, leading to reduced injection accuracy and engine performance, as the fixed current setpoint value cannot adapt to changing magnetic force requirements.
Innovation Solution
A method that uses a sensor to detect premature closing of the solenoid valve and increases the current through the solenoid coil to maintain the desired magnetic force, ensuring the valve remains open during injection, with the current adjustment stored for subsequent activations to adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed current setpoint value is used for the solenoid valve, then the control system is simple and easy to operate, but the solenoid valve closes prematurely due to aging effects, deposits, and increased fuel viscosity
Solution Approach 1:
The patent implements dynamic adaptation of the current setpoint value through iterative learning. The control unit continuously adjusts the holding current based on detected premature closures, transforming the static fixed current system into a dynamic adaptive system that responds to changing operational conditions such as aging, deposits, and fuel viscosity changes.
Solution Approach 2:
The patent employs feedback control by detecting the actual closing point in time of the solenoid valve and using this information to adjust the current setpoint value. The control unit monitors whether the valve closes prematurely and iteratively modifies the holding current to compensate for magnetic force degradation, ensuring reliable operation throughout the system's service life.
2Reliability
If the current through the solenoid coil is increased to compensate for magnetic force loss, then the solenoid valve remains open longer, but energy consumption increases
Solution Approach 1:
The patent applies partial action by increasing the current only to the extent necessary to prevent premature closure. Rather than continuously operating at maximum current, the control unit iteratively adjusts the holding current to the minimum level required to maintain reliable valve opening, optimizing the balance between reliability and energy consumption.
Solution Approach 2:
The patent dynamically changes the current parameter based on operational conditions. The holding current is adjusted iteratively to match the actual magnetic force requirements of the solenoid valve, ensuring sufficient current to maintain opening while avoiding excessive energy consumption that would result from continuously high current operation.
3Reliability
If monitoring and current adjustment is performed continuously, then the solenoid valve operation is optimized, but the device complexity and computational load increase
Solution Approach 1:
The patent implements periodic monitoring and adjustment rather than continuous operation. The control unit detects premature closures and adjusts the current setpoint value iteratively at appropriate intervals during operation, reducing computational load and device complexity while maintaining injection accuracy and reliable valve operation throughout the delivery duration.
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 enhances the robustness of solenoid valve systems, maintaining accurate fuel injection even under extreme conditions, such as deposits or wear, and prevents unnecessary energy consumption by monitoring only during activation, while avoiding high currents that could damage the solenoid valve.
Implementation Method 1
A desired setpoint opening time corresponds to a calculated time duration, for example, during which fuel is to be injected into a combustion chamber of an internal combustion engine
Implementation Method 2
With the aid of a sensor, a closing point in time of the solenoid valve is detected and a sensor value is monitored
Data Source
AI summary
A method for predefining a current through a solenoid coil of a solenoid valve, a closing point in time of the solenoid valve being detected with the aid of a sensor, a sensor value being monitored, and, when a premature closing of the solenoid valve is identified based on the monitored sensor value, the current through the solenoid coil of the solenoid valve is increased.