Fuel Injector Control for Hydraulic Fusion Stability
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Solution Overview
Problem
Conventional fuel injection systems in internal combustion engines face challenges in maintaining zero hydraulic interval between pilot and main injections due to injector aging, which affects injection stability and efficiency, especially with stringent emission and fuel consumption regulations.
Innovation Solution
An electronic control system that applies first and second electronic control signals to fuel injectors to generate fuel injections, determines hydraulic fusion, and adjusts the electric dwell time between these signals to separate the injections, thereby mitigating the effects of injector aging and maintaining optimal injection patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zero hydraulic interval (ZHI) between pilot injection and main injection is targeted, then combustion efficiency is improved, but injection stability deteriorates due to narrow electrical dwell time range and sensitivity to injector aging
Solution Approach 1:
The system performs preliminary characterization of each injector to determine its specific electrical dwell time range that maintains ZHI. This pre-established knowledge base allows the control system to apply compensatory adjustments proactively, preventing injection instability before it occurs during engine operation.
Solution Approach 2:
The system dynamically adjusts the electrical dwell time parameter based on injector aging and operating conditions. By modifying this critical parameter within the determined optimal range, the system maintains ZHI and combustion efficiency while compensating for injector degradation over time.
2Loss of energy
If very close injection patterns are used, then fuel efficiency and combustion noise are improved, but injection stability deteriorates due to pressure wave propagation and needle dynamics
Solution Approach 1:
The system incorporates feedback mechanisms that monitor injection characteristics and detect deviations caused by pressure wave propagation and needle dynamics. This feedback enables real-time adjustments to maintain stable injection patterns while preserving the fuel efficiency benefits of close injection sequences.
Solution Approach 2:
The system pre-characterizes each injector's response to close injection patterns, establishing baseline performance data. This preliminary information enables the control system to predict and compensate for stability issues before they manifest, maintaining optimal fuel efficiency while preventing injection instability.
3Productivity
If electrical dwell time is reduced to achieve ZHI, then combustion efficiency is improved, but sensitivity to injector aging increases
Solution Approach 1:
The system performs preliminary characterization of each injector's electrical dwell time characteristics and aging behavior. This pre-established knowledge allows the control system to apply compensatory adjustments proactively, maintaining ZHI and combustion efficiency while compensating for injector degradation over the injector's operational life.
Solution Approach 2:
The system dynamically adjusts the electrical dwell time parameter based on detected injector aging and performance degradation. By modifying this critical parameter within the determined optimal range, the system maintains both combustion efficiency and tolerance to injector aging throughout the injector's service life.
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 the negative impacts of injector aging by ensuring stable and efficient fuel injection patterns, improving combustion efficiency and reducing emissions, while adhering to stringent emission standards.
Implementation Method 1
The movable needle is actuated with the aid of a dedicated actuator, typically a solenoid actuator or a piezoelectric actuator
Implementation Method 2
The movable needle is actuated with the aid of a dedicated actuator, typically a solenoid actuator or a piezoelectric actuator
Implementation Method 3
When the needle is in an open position, fuel is injected under pressure into a cylinder of the engine
Data Source
AI summary
Methods and systems are provided for controlling fuel injections by a fuel injector in a cylinder of an internal combustion engine. First and second fuel injections are applied in each cycle of a piston in the cylinder. First and second electronic control signals are applied to the fuel injector to generate first and second fuel injections by the fuel injector during a first cycle of the piston. A hydraulic fusion state of the generated first and second fuel injections is determined. A parameter of the applied first and second electronic control signals is adjusted in response to determining the hydraulic fusion state and applied to the fuel injector to generate first and second fuel injections by the fuel injector during a second cycle of the piston subsequent to the first cycle.