Fuel Injection Control Device Area Correction
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Solution Overview
Problem
The existing injection control devices for fuel injection valves face challenges in maintaining accurate fuel injection due to variations in energization current gradients, leading to reduced actual injection quantities and potential engine issues like deteriorated A/F ratios and accidental fires, while prolonged energization times compromise fuel efficiency.
Innovation Solution
The proposed solution involves an area correction technique that calculates an energization time correction amount by performing area correction on the current flowing through the fuel injection valve, switching from single to multi-stage injection under predetermined conditions to increase the frequency of area correction checks, ensuring a high monitor rate and minimizing fuel efficiency losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the energization time is prolonged to compensate for lower current gradient, then the actual injection quantity increases, but fuel efficiency deteriorates
Solution Approach 1:
The system dynamically changes the energization time parameter based on detected current characteristics. When a lower current gradient is detected, the energization time is extended; when a higher gradient is detected, the energization time is reduced. This adaptive parameter adjustment ensures accurate injection quantity while optimizing fuel efficiency for each operating condition.
Solution Approach 2:
The system implements feedback control by detecting the actual energization current gradient and using this information to adjust the energization time. The correction amount calculation unit computes the required time adjustment based on the detected current characteristics, creating a closed-loop control system that maintains injection accuracy while minimizing energy loss.
2Measurement precision
If the energization time is extended to ensure sufficient fuel injection, then injection accuracy improves, but fuel consumption increases
Solution Approach 1:
The system adjusts the energization time parameter dynamically based on real-time detection of current gradient characteristics. By changing this parameter adaptively rather than using a fixed conservative value, the system achieves precise injection control while avoiding unnecessary extension of energization time that would waste fuel.
Solution Approach 2:
The system transitions from static, predetermined energization timing to dynamic adjustment based on detected electrical characteristics. The energization time is continuously optimized according to actual operating conditions, allowing the system to maintain high injection accuracy while adapting to varying fuel efficiency requirements.
3Loss of energy
If single injection is used for low load operations, then fuel efficiency is maintained, but area correction check frequency decreases
Solution Approach 1:
The system segments the injection process into multiple stages (first injection and second injection) within the same injection event. This segmentation allows area correction checks to be performed at multiple points (before first injection and before second injection), increasing check frequency without requiring separate injection events and thus maintaining fuel efficiency.
Solution Approach 2:
The system implements periodic area correction checks at regular intervals within the injection control cycle. By performing checks before the first injection and before the second injection in multi-stage operations, the system creates multiple periodic monitoring opportunities, increasing overall check frequency while maintaining efficient single-event injection.
Data Source
AI summary
In a current-driving of a fuel injection valve to inject fuel through a single injection or a multi-stage injection, an energization time correction amount is calculated by performing area correction on a current flowing through the fuel injection valve. The single injection is switched to the multi-stage injection when the single injection is consecutively performed under a predetermined condition.