Fuel Injector Metering Waveforms for Solenoid Heat Reduction
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Solution Overview
Problem
Existing fuel injection systems face issues with increased heat generation due to prolonged energization of solenoids, leading to performance degradation and potential overheating, which is not addressed by existing pulse control systems.
Innovation Solution
A multi-fuel injection system generates combustion and metering signals with distinct waveforms, including combustion and metering keep-in and hold-in sections, to manage fuel injection and metering efficiently, reducing solenoid heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If solenoids are energized for relatively long periods of time to maintain fuel injection control, then fuel injection performance is maintained, but heat builds up causing performance degradation and potential overheating
Solution Approach 1:
The patent applies periodic action by using distinct combustion and metering waveforms with alternating energization and de-energization phases. The combustion waveform provides full energization during injection events, while the metering waveform uses reduced amplitude energization during non-injection periods, creating a periodic cycle that maintains control while allowing thermal dissipation.
Solution Approach 2:
The patent changes the electrical parameters of the solenoid control signal by implementing two distinct waveforms: a combustion waveform with higher amplitude for active injection and a metering waveform with reduced amplitude for non-injection periods. This parameter change allows the system to maintain solenoid control functionality while reducing heat generation during metering phases.
2Manufacturing precision
If solenoids are energized continuously to maintain precise fuel metering control, then fuel metering precision is maintained, but heat generation increases leading to increased wear
Solution Approach 1:
The patent implements dynamics by making the solenoid control signal adaptive and variable rather than static. The system dynamically switches between combustion and metering waveforms based on operational requirements, adjusting the energization amplitude and duration to match the specific control needs at different times, thereby maintaining precision while reducing overall thermal stress.
Solution Approach 2:
The periodic alternation between full-power combustion waveform and reduced-power metering waveform allows the system to achieve precise metering control only when necessary, while periodically reducing energization to minimize heat accumulation and wear during non-critical phases.
3Device complexity
If a single waveform is used for both combustion and metering, then device complexity is reduced, but the system cannot optimize fuel injection performance under various conditions
Solution Approach 1:
The patent segments the fuel injection control signal into two distinct waveforms: a combustion waveform for active injection events and a metering waveform for non-injection periods. This segmentation allows each waveform to be optimized for its specific function, with the combustion waveform providing full power for injection and the metering waveform providing reduced power for control, thereby enhancing adaptability while maintaining manageable 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
The system effectively reduces solenoid temperatures and enhances fuel injection performance by optimizing fuel metering and injection processes, adapting to various conditions.
Implementation Method 1
A solenoid valve (210) actuates a control valve member (216)
Implementation Method 2
A fuel injector (114) is configured to perform fuel injection
Data Source
AI summary
A multi-fuel injection system and method for generating combustion signals and metering signals for fuel injectors are provided. A first fuel and a second fuel may be received. A combustion signal may be generated to cause a fuel injector to perform fuel injection to inject at least one of the first fuel or the second fuel into a cylinder of an engine. A metering signal may be generated to cause the fuel injector to perform fuel metering to introduce the second fuel into a nozzle of the fuel injector while the fuel injector is not injecting either of the first fuel or the second fuel into the cylinder of the engine.