Partial-Lift Fuel Injection Control via Valve Lift Feedback
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Solution Overview
Problem
The accuracy of fuel injection quantity control in internal combustion engines is compromised due to differences in injection quantity characteristics between full-lift and partial-lift injections, leading to variations in lifting behaviors of the valve element, which affect injection quantity and potentially degrade exhaust emission and drivability.
Innovation Solution
A fuel injection control device that includes an injection control unit to implement partial-lift injection by adjusting energization time, a characteristic acquisition unit to acquire the actual lifting behavior of the valve element, and a correction unit to compare this with a reference characteristic and correct the fuel injection quantity, ensuring accurate partial-lift injection without degrading to full-lift injection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If partial-lift injection is implemented to enable minute injection, then injection flexibility is improved, but injection quantity accuracy deteriorates due to differences in lifting behavior characteristics
Solution Approach 1:
The patent detects the actual closing timing of the injection valve during partial-lift injection and feeds back this information to the control unit. The control unit then corrects the injection quantity based on the detected closing timing, ensuring accurate fuel injection despite the valve not reaching the full-lift position. This feedback mechanism resolves the accuracy issue while maintaining injection flexibility.
Solution Approach 2:
The patent changes the control parameter from fixed energization time to variable energization time based on detected valve closing timing. By adjusting the energization time dynamically according to actual valve behavior, the system maintains accurate injection quantity control while enabling partial-lift injection flexibility.
2Quantity of substance
If energization time is extended to ensure sufficient fuel injection, then injection quantity is improved, but valve element reaches full-lift position causing degradation to full-lift injection characteristics
Solution Approach 1:
The detection unit monitors the actual closing timing of the injection valve during partial-lift injection. The control unit uses this feedback to adjust the energization time, ensuring the valve element remains in the partial-lift state while achieving the required injection quantity through corrected timing rather than extended duration.
Solution Approach 2:
The patent applies partial action by intentionally limiting the valve element lift to less than the full-lift position during partial-lift injection. By using corrected energization time based on detected closing timing, the system achieves sufficient injection quantity without the valve reaching the full-lift position, maintaining partial-lift characteristics.
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 configuration allows for highly accurate implementation of partial-lift injections by correcting fuel injection quantities based on actual lift characteristics, thereby maintaining precision and avoiding inaccuracies caused by differences in full-lift and partial-lift injection characteristics, thus enhancing engine performance and reducing emission and drivability issues.
Implementation Method 1
a valve element to open to inject fuel in conjunction with energization of the fuel injection valve
Data Source
AI summary
An ECU opens a valve element to inject fuel in conjunction with energization of a fuel injection valve provided for an engine. The ECU includes an injection control unit, a characteristic acquisition unit, and a fuel injection correction unit. The injection control unit implements a partial-lift injection during which the valve element does not reach a full-lift position to open the fuel injection valve by an energization time. The characteristic acquisition unit acquires an actual lifting behavior of the valve element as an actual lift characteristic when the partial-lift injection is implemented. The fuel injection correction unit compares the actual lift characteristic acquired by the characteristic acquisition unit with a predetermined reference characteristic and corrects a fuel injection quantity in the partial-lift injection based on a result of the comparison.