Fuel Injector Dynamic Calibration for Precise Low-Quantity Delivery
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Solution Overview
Problem
Existing fuel injection systems struggle to adapt to changing performance characteristics of fuel injectors over time, particularly in controlling low quantities of fuel, leading to inefficiencies and inaccuracies in fuel delivery.
Innovation Solution
A dynamic fuel injection control system that generates and updates calibration data during engine operation by periodically operating fuel injectors in non-injection states, storing parameter information, and using this data to accurately deliver low fuel quantities based on real-time injector performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fixed calibration data is used for fuel injectors, then the system is simple to operate, but the fuel injection precision deteriorates over time as injector performance changes
Solution Approach 1:
The patent implements dynamic calibration data that continuously updates during engine operation based on real-time injector performance measurements. Instead of using fixed pre-programmed calibration values, the system adapts the calibration data dynamically to reflect actual injector characteristics at any given moment, resolving the contradiction between maintaining precision and avoiding complex adaptive systems.
Solution Approach 2:
The system incorporates feedback mechanisms where the control system measures actual fuel injection quantities and uses this information to update calibration data. The feedback loop continuously refines the calibration parameters based on measured injector performance, ensuring precision is maintained without requiring overly complex predictive models.
2Adaptability or versatility
If calibration data is updated continuously during engine operation, then the adaptability to injector performance changes is improved, but the processing time and computational load increase
Solution Approach 1:
The patent implements periodic updates of calibration data at predetermined intervals or under specific operating conditions rather than continuous real-time updates. This periodic approach maintains adaptability to injector performance changes while significantly reducing computational processing time and control system workload compared to continuous updates.
Solution Approach 2:
The system performs preliminary characterization of injector performance during dedicated test cycles or during engine startup phases, storing this data for later use. This preliminary action reduces the need for frequent updates during normal operation, thereby reducing processing time while maintaining adaptability.
3Quantity of substance
If low quantity fuel injection pulses are delivered, then the fuel efficiency is improved, but the control accuracy deteriorates due to injector performance variations
Solution Approach 1:
The patent implements injector-specific calibration data that accounts for individual variations in each injector's performance characteristics. Instead of using a single general calibration curve for all injectors, the system tailors the calibration data to each specific injector's behavior, particularly for low quantity pulses where small variations have significant impact on control accuracy.
Solution Approach 2:
The system dynamically adjusts calibration parameters based on measured injector performance, including parameters such as pulse width, rail pressure, and temperature compensation. These parameter changes are specifically optimized for low quantity injection pulses to maintain control accuracy even as injector characteristics drift over time.
Data Source
AI summary
Fuel injection control systems and methods for enhancing the delivery of low quantities of fuel in internal combustion engines. Calibration/control data may be continuously generated and updated during the operation of the engine, for example without delivering fuel to the engine cylinders. Disclosed embodiments include periodically operating one or more fuel injectors of the engine in a non-injection state; generating and storing parameter information representative of the operation of the one or more fuel injectors in the non-injection state; and operating the one or more fuel injectors in an injection state to inject a desired pulse of fuel based upon the parameter information and information representative of an additional amount of fuel.