Fuel Injector Control Device Individual Difference Detection
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Solution Overview
Problem
Existing methods for detecting individual differences in fuel injectors are either costly due to the need for sensors to monitor valve body behavior or prone to erroneous results due to difficulty in isolating the individual difference of the fuel injector, leading to inaccurate detection and increased costs.
Innovation Solution
Implementing a learning unit that interrupts or prohibits learning of valve opening/closing timing based on predetermined conditions, such as changes in fuel pressure or unstable valve body behavior, to reduce factors affecting individual difference detection and ensure accurate detection of fuel injector differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided to directly monitor the valve body behavior of the fuel injector, then the detection accuracy of individual difference is improved, but the cost of the fuel injector increases
Solution Approach 1:
The patent extracts the detection function from a separate sensor and integrates it into the existing drive circuit by monitoring the voltage across the solenoid coil. This eliminates the need for additional sensors while maintaining detection capability, thereby improving measurement precision without increasing device complexity or cost.
Solution Approach 2:
The patent uses the voltage signal across the solenoid coil as an intermediary to indirectly measure valve body behavior. Instead of directly measuring valve stroke with a sensor, the voltage signal serves as a mediator that correlates with valve position, achieving accurate detection without adding costly sensors.
2Measurement precision
If the learning of valve opening/closing timing is continuously performed, then the detection of individual difference is achieved, but erroneous detection results occur due to factors not caused by valve body behavior
Solution Approach 1:
The patent performs preliminary checks before learning by monitoring whether the voltage signal change falls within expected ranges corresponding to actual valve opening/closing events. This preliminary validation prevents erroneous learning from occurring due to noise or unrelated voltage fluctuations, thereby improving detection reliability.
Solution Approach 2:
The patent incorporates feedback mechanisms where the learned individual difference values are used to adjust subsequent learning processes. The system continuously monitors detection results and refines the learning algorithm based on accumulated data, improving both accuracy and reliability over time while filtering out erroneous detections.
Data Source
AI summary
Since a factor affecting an individual difference learning result is reduced or eliminated regardless of a valve body behavior, it is possible to highly accurately detect an individual difference of a fuel injector caused by the valve body behavior and to reliably detect the individual difference even when the fuel injector is replaced. When a valve opening/closing timing of the fuel injector is learned by a learning unit, a unit of interrupting the learning if a predetermined condition is established, a unit of prohibiting the learning of the valve closing timing using the learning unit if a predetermined condition is established, or a unit of prohibiting the learning of the valve opening/closing timing of the fuel injector using the learning unit if a fuel pressure of a common rail supplying a fuel to the plurality of fuel injectors changes by a predetermined value or more within a predetermined time is provided.