Fuel Injector Current Control for Accurate Injection Timing
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Solution Overview
Problem
Current injection control devices for internal combustion engines face challenges in accurately correcting the current area due to circuit errors in current detection units, leading to deviations in the energization current slope and resulting in insufficient fuel injection amounts.
Innovation Solution
An injection control device that includes a current detection unit, a current area correction control unit, and a reference current value correction unit, which calculates and corrects the integrated current values based on the energization current profile and detected current values, and adjusts the energization time to achieve accurate fuel injection amounts by correcting reference current values for circuit errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If circuit errors are present in the current detection unit, then the detected current values deviate from actual current values, but the injection control device still needs to achieve accurate fuel injection amounts
Solution Approach 1:
The patent implements feedback control by detecting the actual current values during fuel injection, comparing them with commanded current values, and calculating correction amounts based on the deviations. The correction amounts are then applied to adjust subsequent injection commands, creating a closed-loop feedback system that compensates for circuit errors and maintains accurate fuel injection despite detection inaccuracies.
2Device complexity
If the energization current profile is used directly without correction, then the control system is simple, but the actual injection amount deviates from the commanded injection amount due to circuit errors
Solution Approach 1:
The patent changes the parameters of the energization current profile by calculating correction amounts based on deviations between commanded and actual current values. These parameter changes are applied to adjust the injection command values, allowing the system to maintain precision without requiring a completely different control approach or additional hardware.
3Manufacturing precision
If correction amounts are calculated for all injection events, then injection accuracy is maintained, but computational load and processing time increase
Solution Approach 1:
The patent applies partial correction by calculating correction amounts selectively rather than for every single injection event. The system determines when correction is necessary based on comparing commanded and actual current values, applying corrections only when deviations exceed acceptable thresholds, thus reducing computational load while maintaining sufficient injection accuracy.
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
This solution enables precise current area correction, ensuring that the fuel injection amounts correspond to the commanded values, even in the presence of circuit errors, thereby improving the accuracy and reliability of fuel injection control.
Implementation Method 1
a current detection unit that detects a value of a current flowing through the fuel injection valve
Data Source
AI summary
An injection control device for a fuel injection valve includes: a current detection unit; and a current area correction control unit that corrects, based on an energization current profile, an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current, and obtains the integrated current value of the current based on an attainment time from a start of energization of the fuel injection valve to an attainment of each of a plurality of reference current values; a storage unit that stores a reference attainment time; and a reference current value correction unit that corrects each reference current value based on a difference between the reference attainment time and a detected attainment time at a time of actual drive.