Fuel Injection Solenoid Valve Control via Current Feedback
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Solution Overview
Problem
Conventional magnetic valve injection systems suffer from inaccuracies and unreliabilities due to bouncing behavior, which affects the injection quantity and timing of fuel into combustion chambers, leading to operational restrictions in internal combustion engines.
Innovation Solution
A method and device for controlling a magnetic valve by analyzing the magnetic flux and current profiles to identify characteristics of displacement starts, allowing for the adjustment of voltage profiles to reduce bouncing behavior, thereby improving injection accuracy and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage profiles are used to actuate the magnetic valve, then the valve can be operated, but bouncing behavior occurs causing inaccuracies in injection quantity and timing
Solution Approach 1:
The control device measures the actual current flowing through the coil and compares it with a reference current value. Based on this feedback, the control device adjusts the actuation voltage in real-time to maintain the current at the reference value, thereby preventing bouncing behavior and improving injection accuracy.
Solution Approach 2:
The invention dynamically changes the actuation voltage parameters (magnitude and timing) based on the measured current feedback. By adjusting the voltage to maintain a reference current value, the system optimizes the magnetic field generation while preventing armature bouncing, thus resolving the contradiction between operational capability and injection precision.
2Productivity
If the armature is allowed to bounce against the pole piece, then the valve can be actuated, but the injection quantity becomes unreliable
Solution Approach 1:
The control device continuously monitors the coil current and uses this feedback to adjust the actuation voltage. This ensures the armature moves smoothly to the pole piece without bouncing, maintaining both high injection rates and precise injection quantities.
Solution Approach 2:
The control system proactively adjusts the voltage profile based on current feedback before bouncing can occur. By maintaining the current at a reference value throughout the actuation process, the system prevents the armature from overshooting and bouncing against the pole piece, ensuring reliable injection quantities.
3Adaptability or versatility
If identical electrical actuation is applied to different injectors, then the control is simplified, but injector-specific variations cause different injection quantities
Solution Approach 1:
The control device measures the actual current for each injector and adjusts the actuation voltage individually based on this feedback. This allows different injectors to be operated optimally with their specific electrical characteristics while maintaining consistent injection quantities across all injectors.
Solution Approach 2:
The system dynamically adjusts actuation parameters (voltage magnitude and duration) for each injector based on measured current characteristics. This enables universal compatibility across different injectors while achieving precise and consistent injection quantities through individualized parameter optimization.
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
The method effectively reduces bouncing behavior and improves the precision of fuel injection by modifying voltage profiles based on magnetic flux and current analysis, resulting in more reliable and accurate injection processes.
Implementation Method 1
A magnetic valve or a solenoid injector may be used for injecting fuel into a combustion chamber, for example into a cylinder. A solenoid injector of this type (also referred to as coil-type injector) has a coil which generates a magnetic field when current flows through the coil, whereby a magnetic force is exerted on an armature
Implementation Method 2
If current continues to flow through the coil, the armature and nozzle needle or closure element move further until the armature arrives at and abuts against the pole piece. The distance between the abutment of the armature against a driver of the closure element or of the nozzle needle and the abutment of the armature against the pole piece is also referred to as needle stroke or working stroke. To close the valve, the excitation voltage applied to the coil is deactivated, and the coil is short-circuited, such that the magnetic force is dissipated. The short-circuiting of the coil results in a polarity reversal of the voltage owing to the dissipation of the magnetic field stored in the coil.
Data Source
AI summary
A device and a method are provided for controlling a magnetic valve which has a coil and an armature which is displaceable by magnetic force, by means of which armature a closure element is displaceable for the purposes of injecting fuel into a combustion chamber, the method includes the steps of: energizing the coil with a voltage in accordance with a first voltage profile in order to generate a first electrical current through the coil; determining a first profile as a function of a first magnetic flux and the first current; identifying, in the first profile, a first characteristic of at least one first start of displacement at which the armature begins to displace the closure element, generating a second voltage profile and energizing the coil in accordance with the second voltage profile, such that, in a second profile, as a function of a second magnetic flux and a second current, a second characteristic of a second start of displacement is more similar to a reference characteristic than the first characteristic.