Fuel Injection Control Device with Area Correction and Learning Stop
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Solution Overview
Problem
Current injection control devices for internal combustion engines face challenges in maintaining accurate fuel injection due to variations in energization current gradients, leading to potential excessive air-fuel ratio corrections and abnormal learning processes, which can result in inappropriate fuel injection quantities.
Innovation Solution
An injection control device that includes a fuel injection quantity command value output unit, a fuel injection quantity correction unit, and a controller executing current area correction by calculating an area correction amount for energization time, while also stopping air-fuel learning based on area and air-fuel correction amounts to prevent excessive corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current area correction is executed to compensate for lower energization current gradient, then fuel injection quantity accuracy is improved, but excessive correction may occur leading to abnormal air-fuel ratio learning
Solution Approach 1:
The system uses feedback from the air-fuel ratio sensor to detect when excessive correction has occurred. The feedback control unit calculates the air-fuel ratio based on sensor output and compares it with the target air-fuel ratio, enabling the system to identify abnormal learning states and adjust correction accordingly.
Solution Approach 2:
The system performs preliminary determination of abnormality before allowing air-fuel ratio learning to proceed. The abnormality determination unit checks whether the correction amount exceeds predetermined thresholds before the learning process, preventing abnormal learning from occurring in the first place.
2Productivity
If air-fuel ratio learning is continuously executed to maintain accurate fuel injection, then fuel efficiency is improved, but inappropriate learning may occur during excessive correction leading to incorrect fuel injection quantities
Solution Approach 1:
The system dynamically adjusts the air-fuel ratio learning process based on real-time correction amounts. When excessive correction is detected, the learning process is automatically suspended or adjusted, allowing the system to adapt its learning behavior to current operating conditions and prevent incorrect learning.
Solution Approach 2:
The system applies preliminary anti-action by preventing air-fuel ratio learning when excessive correction is detected. The abnormality determination unit blocks the learning process before inappropriate data can be incorporated, counteracting potential harmful effects before they occur.
Data Source
AI summary
An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; a fuel injection quantity correction unit that calculates an air-fuel correction amount and corrects the command value for the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time. The injection control device further includes a learning controller that stops the air-fuel learning.