Fuel Injection Control Device Correcting Energization Time
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Solution Overview
Problem
Existing injection control devices face challenges in accurately calculating energization time corrections when the signal-to-noise ratio (S/N) of the detected current is not secured, which can lead to inefficiencies and misfires in fuel injection systems.
Innovation Solution
The proposed solution involves an electronic control unit (ECU) with a microcontroller and control IC that calculates energization time corrections using correction coefficients and peak current estimates, allowing for real-time adjustment of energization times to ensure accurate fuel injection, even with low S/N ratios, by approximating the integrated current difference and peak current values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the injection control device uses a standard A/D converter with limited resolution to detect fuel injection current, then the device complexity and cost are reduced, but the signal-to-noise ratio of the detected current deteriorates, making it difficult to accurately calculate energization time corrections
Solution Approach 1:
The patent introduces an intermediary calculation approach by computing the integrated current difference through mathematical integration of detected current values rather than relying on direct high-resolution current measurement. This intermediary method allows accurate energization time correction calculation even with limited A/D converter resolution by accumulating current information over the energization period.
Solution Approach 2:
The patent transforms the measurement parameter from instantaneous current value to integrated current difference over time. By changing the parameter from raw current detection to time-integrated current accumulation, the system achieves accurate measurement of energization characteristics even with low-resolution A/D conversion, as the integration process amplifies the signal while averaging out noise.
2Device complexity
If the injection control device attempts to calculate energization time correction using detected current with low S/N ratio, then the measurement process is simplified, but the calculation accuracy of energization time correction deteriorates, leading to fuel injection inefficiencies and misfires
Solution Approach 1:
The patent performs preliminary integration of the detected current during the fuel injection energization period to calculate the integrated current difference. This preliminary action accumulates the current information while the injection is occurring, allowing the system to derive accurate energization characteristics from low-S/N raw current data before proceeding to the correction calculation, thereby ensuring reliable fuel injection control.
Solution Approach 2:
The patent implements a feedback mechanism where the calculated integrated current difference is used to determine the energization time correction amount, which is then applied to adjust subsequent fuel injection timing. This feedback loop continuously refines the energization timing based on actual current integration results, maintaining reliable fuel injection even when individual current measurements have low signal-to-noise ratios.
3Productivity
If the injection control device uses ideal current profile-based energization control, then the fuel injection efficiency is improved, but the system becomes sensitive to detection noise, making accurate correction calculation difficult when S/N ratio is low
Solution Approach 1:
The patent maintains continuous integration of the detected current throughout the entire energization period, continuously accumulating current information to calculate the integrated current difference. This continuous integration approach ensures that useful current information is captured throughout the fuel injection process, enabling accurate energization time correction calculation even when individual measurement points are affected by noise, thus preserving fuel injection efficiency.
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 approach enables precise correction of energization times, preventing misfires and maintaining fuel efficiency, even with poor A/D converter resolution and low detected current S/N, ensuring reliable engine operation.
Implementation Method 1
a needle valve (2b) that opens and closes a valve hole (2c), and a solenoid coil (2a) that drives the needle valve (2b)
Data Source
AI summary
An injection control device of capable of correcting an energization time even in an S/N non-guaranteeable situation includes: an energization controller calculating an energization time correction amount based on an area correction performed by an energization time correction amount calculator regarding electric current flowing in a fuel injection valve when the fuel injection valve is electrically driven for injecting fuel; and an energization instruction time calculator correcting an energization instruction time for fuel injection in a next cycle and thereafter by using the energization instruction time correction amounts in or before a current cycle.