Solenoid Fuel Injector Multiple Injection Control
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Solution Overview
Problem
Solenoid-driven fuel injectors in internal combustion engines face challenges in achieving precise fuel quantity injection due to residual magnetization, leading to reduced precision at short pause times, which is exacerbated by rising emissions standards requiring more precise and multiple injections.
Innovation Solution
A method involving multiple injections with a solenoid-driven fuel injector, where a first target injection quantity is determined for the initial series, followed by a second series with an adjusted target quantity to compensate for deviations, ensuring the total fuel quantity is injected, utilizing measured current and voltage curves to estimate actual injection quantities and adjust accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple injections with short pause times are performed using a solenoid-driven fuel injector, then the injection frequency and productivity are improved, but the manufacturing precision of the injected fuel quantity deteriorates due to residual magnetization
Solution Approach 1:
The patent divides the multiple injections into two subseries: a first subseries where injections are performed with short pause times (improving productivity), and a second subseries where the pause time is extended to allow complete dissipation of residual magnetization (restoring precision). This segmentation allows the system to achieve both high injection frequency and accurate fuel quantity control.
Solution Approach 2:
The patent dynamically adjusts the pause time between injections based on the injection series. For the first subseries, a shorter pause time is used to maintain high productivity, while for the second subseries, the pause time is dynamically extended to ensure complete magnetization dissipation and achieve the required injection precision. This dynamic adaptation resolves the contradiction between speed and accuracy.
2Productivity
If the pause time between injections is reduced to increase injection frequency, then the productivity is improved, but the injected fuel quantity precision deteriorates due to residual magnetization influence
Solution Approach 1:
The injection process is segmented into two distinct subseries with different pause time characteristics. The first subseries uses reduced pause times to maximize injection frequency, while the second subseries uses extended pause times to ensure complete magnetization dissipation. This segmentation allows the system to achieve both high productivity and precision by distributing different operational requirements across different injection groups.
Solution Approach 2:
The patent implements a periodic pattern where injections are performed in alternating subseries: a first subseries with short pause times followed by a second subseries with longer pause times. This periodic alternation between high-speed and high-precision modes allows the system to maintain overall high productivity while periodically resetting the magnetization state to ensure precision for subsequent injection cycles.
3Device complexity
If solenoid injectors are used to provide an economical solution, then the device complexity and cost are reduced, but the injection precision deteriorates due to residual magnetization effects
Solution Approach 1:
The patent maintains the simple and economical solenoid-driven injector design while dynamically adapting the injection strategy to compensate for residual magnetization effects. By dynamically adjusting pause times and organizing injections into two subseries, the system achieves high precision without requiring more complex or expensive injector hardware, thus resolving the contradiction between device simplicity and injection precision.
Solution Approach 2:
The patent changes the temporal parameters of the injection process (pause times between injections) to compensate for the inherent limitations of solenoid-driven injectors. By extending pause times in the second subseries, the system allows complete dissipation of residual magnetization, thereby achieving precise fuel quantity control while maintaining the use of simple and economical solenoid injectors without additional hardware complexity.
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 method achieves high precision in fuel injection with short pause times without additional hardware, effectively compensating for deviations in the first series through adjustments in the second series, maintaining precision and meeting stringent emissions standards.
Implementation Method 1
a fuel injector having a solenoid drive
Implementation Method 2
the opening behavior of the injector is influenced because of the residual magnetization
Data Source
AI summary
A method for injecting a predetermined total fuel quantity via multiple injections using a fuel injector having a solenoid drive for an internal combustion engine of a motor vehicle is disclosed. The method includes determining a first target injection quantity to be injected per injection to inject the total fuel quantity throughout a series of consecutive injections; and performing a first subseries of consecutive injections, where the fuel injector is actuated according to the first target injection quantity. The method also includes determining a first fuel quantity injected during the first subseries of injections; determining a second target injection quantity to be injected per injection in a second subseries of consecutive injections, to inject the total fuel quantity throughout the first subseries and the second subseries of consecutive injections; and performing the second subseries of injections. The fuel injector is actuated according to the second target injection quantity.