Fuel Injector Current Waveform Control for Cylinder Combustion Balance
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Solution Overview
Problem
Existing fuel injector control systems do not account for injector-specific and cylinder-specific conditions, leading to inconsistent combustion and performance across cylinders in internal combustion engines.
Innovation Solution
A system and method that adjusts fuel injector commands based on real-time combustion data from sensors, allowing for individualized control of fuel injectors to normalize combustion across cylinders by varying current waveforms for each injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identical commands are used for all fuel injectors, then the control system is simple, but combustion consistency across cylinders deteriorates due to injector-specific and cylinder-specific variations
Solution Approach 1:
The patent applies local quality by transitioning from uniform commands to injector-specific and cylinder-specific commands. Each fuel injector receives customized commands based on its individual characteristics and the specific cylinder conditions, allowing localized optimization of combustion parameters to achieve consistent performance across all cylinders despite manufacturing variations and wear.
Solution Approach 2:
The system dynamically adjusts fuel injector commands based on real-time sensor feedback from each cylinder. The controller continuously monitors combustion conditions and modifies injection parameters accordingly, enabling the system to adapt to changing conditions over time and maintain optimal combustion consistency without requiring complex manual reconfiguration.
2Ease of operation
If static injector control commands are used, then the system is easy to operate, but it fails to compensate for manufacturing deviations, wear, and environmental changes
Solution Approach 1:
The patent implements feedback by incorporating sensors in each cylinder that continuously monitor combustion conditions and feed this information back to the controller. The controller uses this feedback to dynamically adjust injector commands, enabling the system to automatically compensate for manufacturing deviations, wear, and environmental changes while maintaining ease of operation through automated adaptation.
3Manufacturing precision
If individualized control commands are generated for each fuel injector, then combustion normalization is achieved, but device complexity increases due to sensor requirements and real-time adjustments
Solution Approach 1:
The system segments the control approach by implementing separate commands for each fuel injector and cylinder rather than using a unified control strategy. This segmentation allows independent optimization of each injector's performance based on its specific characteristics and the conditions in its designated cylinder, achieving combustion normalization through targeted adjustments.
Solution Approach 2:
The system enables self-service by allowing the controller to automatically adjust injector commands based on real-time sensor feedback without requiring external intervention. The system monitors its own performance and makes necessary corrections autonomously, reducing the need for complex manual calibration while achieving precise combustion control.
Data Source
AI summary
A system for injecting fuel into an internal combustion engine includes an engine cylinder, a fuel injector configured to inject fuel into the engine cylinder, and a sensor configured to output a signal indicative of a condition associated with the combustion of fuel in the engine cylinder. The system also includes a controller configured to generate commands for an injection of fuel into the internal combustion engine and receive the signal from the sensor. The controller is further configured to generate adjusted commands for: a current amplitude, a start of current time, an end of current time, a duration of a pull-in current, a duration of a keep-in current, or a duration of a hold-in current, for a subsequent injection of fuel into the internal combustion engine, based on the signal from the sensor.