Fuel Injection Valve Drive Waveform Control for Minimum Quantity Variation
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Solution Overview
Problem
Internal combustion engines face challenges in maintaining linearity of fuel injection quantity characteristics and reducing injection quantity variation across multiple injections within a combustion cycle, particularly when minimizing the injection quantity of minimum, which affects the dynamic range and efficiency of fuel injection valves.
Innovation Solution
A control apparatus that optimizes the drive waveform for each fuel injection valve by setting a drive current waveform profile tailored to individual valve characteristics, using time-controlled current profiles to reduce bouncing and variation, and incorporating precise shunt resistor detection for accurate current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection quantity of minimum is reduced to enable multiple injections within one combustion cycle, then the number of injections increases, but the injection quantity variation for each fuel injection valve increases and linearity of injection quantity characteristics deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the drive current waveform parameters (peak current value, duration, shape) for each fuel injection valve based on measured injection quantity characteristics. This allows optimization of injection quantity linearity while maintaining reduced minimum injection quantity for multiple injections per combustion cycle.
Solution Approach 2:
The patent implements feedback control by measuring the actual injection quantity of each fuel injection valve and using this information to determine individualized drive current waveform parameters. This feedback mechanism compensates for variations between valves, reducing injection quantity variation while enabling multiple injections.
2Quantity of substance
If the injection quantity of static is increased to improve fuel injection capability, then the injection quantity of minimum increases, but the dynamic range between injection quantity of static and minimum narrows
Solution Approach 1:
The patent applies local quality by setting different drive current waveform parameters for each fuel injection valve based on its individual characteristics. This allows each valve to operate optimally across the full dynamic range, maintaining both high injection quantity capability and low minimum injection quantity without compromising overall system performance.
3Device complexity
If a common drive current waveform profile is used for all fuel injection valves, then the control system is simplified, but injection timing difference and injection quantity variation occur between valves
Solution Approach 1:
The patent determines individualized drive current waveform parameters for each fuel injection valve based on measured injection quantity characteristics. This approach maintains reasonable system complexity while significantly reducing injection quantity variation between valves through parameter optimization.
Solution Approach 2:
The patent performs preliminary measurement and characterization of each fuel injection valve's injection quantity before operation. This preliminary action enables the system to store and use individualized drive current waveform parameters, compensating for valve variations before they affect combustion performance.
Data Source
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AI summary
An object of the invention is to reduce an injection quantity of minimum by reducing difference in machines of fuel injection valves and difference in injection quantities of fuel injection valves caused by difference in characteristics. A fuel injection valve drive unit includes a unit that individually sets drive current waveform profiles according to cylinders, and includes a unit that individually sets drive current waveform profiles of the fuel injection valves on the basis of identification information based on injection quantity characteristics of the fuel injection valves.