Valve Injection Timing Correction via Opening and Closing Time Feedback
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Solution Overview
Problem
Existing direct injection valve systems with coil drives face challenges in achieving precise fuel injection quantities, especially at low injection levels due to fabrication and actuation tolerance-related deviations, leading to inaccurate fuel delivery and increased emissions.
Innovation Solution
A method to determine an effective injection time by accounting for both opening and closing times of the valve, using iterative procedures and correction values based on measured current and voltage profiles, to improve the accuracy of fuel injection quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant fuel pressure and standard coil drive actuation are used, then the injection system is simple to operate, but the injection quantity accuracy deteriorates at low injection levels due to fabrication tolerances and actuation variations
Solution Approach 1:
The patent implements feedback by measuring the actual valve opening time and closing time, comparing them against target values, and using the deviations to calculate corrected actuation durations. This closed-loop control compensates for fabrication tolerances and actuation variations, significantly improving injection quantity accuracy at low injection levels without requiring hardware modifications
Solution Approach 2:
The patent changes the actuation parameters (duration and timing) based on measured valve behavior. By adjusting the actuation duration according to actual opening and closing times, the system compensates for tolerances in fabrication and actuation, enabling accurate low-quantity injections while maintaining system simplicity
2Measurement precision
If the electric actuation duration is extended to compensate for opening/closing transitions, then the injection quantity accuracy improves, but the injection time increases reducing productivity
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction values based on measured opening and closing times, and storing these corrections for immediate application. This allows the system to achieve accurate injection quantities without extending the actual injection duration, maintaining productivity while improving precision
Solution Approach 2:
The patent introduces dynamic adjustment of actuation parameters based on real-time measurements of valve opening and closing behavior. By adapting the actuation duration dynamically according to actual valve transitions, the system achieves accurate injection quantities without fixed time extensions, preserving injection rate and productivity
3Measurement precision
If iterative correction procedures are applied to each injection pulse, then the injection quantity accuracy improves significantly, but the computational load and processing time increase
Solution Approach 1:
The patent performs preliminary measurements of valve opening and closing times during initial operation or calibration phases, storing these characteristics for later use. This pre-characterization eliminates the need for iterative corrections during actual injection operations, reducing computational load and processing time while maintaining accuracy
Solution Approach 2:
The patent applies partial correction by using predetermined correction values based on measured valve behavior rather than full iterative optimization for each injection. This approach achieves sufficient accuracy for practical purposes while minimizing computational overhead and processing time
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 precision of fuel injection, particularly at low quantities, by compensating for variations in injector behavior and mechanical tolerances, thereby improving the overall accuracy and reliability of the injection process.
Implementation Method 1
a valve which has a coil drive
Data Source
AI summary
A method for determining an effective injection time of a valve having a coil drive includes determining an opening time of the valve, determining a closing time of the valve, and determining the effective injection time of the electric actuation of the valve for an injection operation based on the defined opening time and the defined closing time.