Fuel Injection Controller Adaptive Correction for Engine Disturbances
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Solution Overview
Problem
Fuel injection controllers in automatic transmission vehicles face reduced learning accuracy due to disturbances like road noise and torsional vibration, which affect the sensing of engine rotation state changes, leading to inaccurate injection amount corrections.
Innovation Solution
A fuel injection controller calculates the difference in engine rotation states with and without learning injections, determines the presence of disturbances by analyzing rotation speed variations, and adjusts the correction of the command injection amount accordingly to minimize the impact of disturbances on learning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection amount learning is performed in A/T vehicles when engine and transmission are engaged but not locked up, then learning opportunities increase, but sensing accuracy of engine rotation state change worsens due to disturbances from transmission side
Solution Approach 1:
The patent applies dynamics by making the correction degree adaptive rather than fixed. The ECU dynamically adjusts the correction degree based on detected disturbance levels during injection amount learning. When disturbances are detected (indicated by large fluctuations in engine rotation speed), the correction degree is reduced or learning is suspended. When disturbances are small, normal correction is applied. This dynamic adjustment resolves the contradiction by allowing learning to proceed under favorable conditions while protecting accuracy under unfavorable conditions.
2Productivity
If injection amount learning is performed in M/T vehicles with damper attached to flywheel, then learning can be performed, but delay or distortion arises in engine rotation speed fluctuation, worsening sensing accuracy
Solution Approach 1:
The patent makes the learning process dynamic by continuously monitoring the actual engine rotation speed fluctuations and comparing them against expected patterns. When the damper causes delayed or distorted fluctuations that exceed predetermined thresholds, the system dynamically reduces the correction degree or suspends learning. This allows the system to utilize learning opportunities in vehicles with dampers while compensating for the measurement distortion caused by the damper's vibration-damping effect.
3Manufacturing precision
If correction degree is increased to improve learning accuracy, then injection amount characteristic deviation decreases faster, but learning accuracy worsens when disturbances are present
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the correction degree parameter based on detected disturbance conditions. Instead of using a fixed high correction degree that would amplify errors under disturbance, the system changes the correction degree parameter in real-time. When disturbances are detected (through monitoring engine rotation speed fluctuations), the correction degree is reduced or set to zero. When conditions are favorable, a higher correction degree is applied to accelerate convergence. This resolves the contradiction by making the correction aggressiveness adaptive to operating conditions.
Data Source
AI summary
A fuel injection controller calculates a difference between a rotation speed fluctuation amount of an engine in the case where an injection for learning is performed and the rotation speed fluctuation amount in the case where the injection for the learning is not performed as a rotation speed increase amount. The controller calculates an actual injection amount actually injected from an injector based on a rotation state of the engine. The controller calculates a difference between the actual injection amount and a command injection amount outputted to the injector as a characteristic deviation and corrects the command injection amount to reduce the characteristic deviation. The controller prohibits the correction of the command injection amount when a variation in the rotation speed increase amount is equal to or greater than a specified value.