Fuel Injection Control Device with Dynamic Energization Correction
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Solution Overview
Problem
The existing injection control devices face challenges in maintaining fuel injection accuracy due to variations in the energization current gradient, leading to reduced actual injection quantities and potential issues like deteriorated A/F ratios and accidental fires, while prolonged energization command times compromise fuel efficiency.
Innovation Solution
An injection control device with an area correction unit that calculates an energization time correction amount based on the integrated current difference between the ideal and detected currents, and a charging circuit that adjusts the energization time correction according to the charge amount, ensuring accurate fuel injection by setting an upper limit guard value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the energization command time is prolonged to compensate for reduced current gradient, then the fuel injection accuracy is improved, but the fuel efficiency deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the energization command time based on the detected charge amount of the charging circuit. The ECU modifies the command time within a predetermined range according to the actual charge amount, allowing the system to adapt to varying conditions rather than using a fixed prolonged time, thus resolving the contradiction between injection accuracy and fuel efficiency
Solution Approach 2:
The system uses feedback from the charge amount determination unit to continuously monitor the charging circuit's charge amount and adjusts the energization command time accordingly. This closed-loop feedback mechanism enables precise control that maintains injection accuracy while optimizing fuel efficiency by avoiding unnecessary prolonged energization
2Quantity of substance
If the energization command time is extended to ensure sufficient fuel injection, then the injection quantity is improved, but the fuel efficiency is reduced
Solution Approach 1:
The energization command time is dynamically adjusted based on the detected charge amount rather than being fixed. This allows the system to provide sufficient injection quantity when needed while minimizing energization time when the charge amount is adequate, resolving the contradiction between injection quantity and fuel efficiency
Solution Approach 2:
The system changes the energization command time parameter according to the charge amount conditions. By modifying this critical parameter based on real-time charge amount detection, the system achieves both sufficient injection quantity and optimized fuel efficiency
3Measurement precision
If the area correction control is increased to compensate for current variations, then the fuel injection accuracy is improved, but the risk of overcorrection increases
Solution Approach 1:
The charge amount determination unit provides continuous feedback on the charging circuit's charge amount, which the area correction unit uses to adjust the energization command time within predetermined limits. This feedback mechanism prevents overcorrection by ensuring corrections are proportional to actual charge conditions
Solution Approach 2:
The system establishes predetermined ranges for energization command time adjustment before operation. These pre-set boundaries act as cushioning against overcorrection, allowing area correction control to improve accuracy while the predetermined limits prevent excessive correction that would compromise reliability
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 effectively maintains fuel injection accuracy by compensating for variations in energization current, preventing overcorrection, and minimizing fuel efficiency reduction, thus ensuring reliable engine operation.
Implementation Method 1
a charging circuit that applies an electric power from the charging unit to the fuel injection valve
Data Source
AI summary
An injection control device includes: an area correction unit that calculates an energization time correction amount when executing a current drive of a fuel injection valve to inject a fuel from the fuel injection valve; a charging circuit that applies an electric power from the charging unit to the fuel injection valve; and a charge amount determination unit for determining the charge amount of the charging unit. The area correction unit changes the area correction control based on a determination result of the charge amount determination unit.