Fuel Injection Control Device with Gradual Correction Reduction
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Solution Overview
Problem
The existing injection control devices face challenges in maintaining fuel efficiency and preventing air-fuel (A/F) roughness due to variations in energization current profiles, which can lead to reduced actual injection quantities and deteriorated A/F values, especially when the energization time correction amount exceeds predetermined limits.
Innovation Solution
An injection control device that includes an energization time correction amount calculation unit for area correction of the current flowing through the fuel injection valve, an abnormality determination unit to assess system abnormalities, and a correction amount subtraction unit to gradually reduce the energization time correction amount, thereby preventing sudden cancellation and maintaining stable engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energization time correction amount is suddenly stopped when abnormality is detected, then the system reliability is improved by preventing excessive correction, but the A/F stability deteriorates causing A/F roughness
Solution Approach 1:
The correction amount subtraction unit dynamically adjusts the energization time correction amount based on the detected abnormality, transitioning from normal correction operation to abnormality handling mode where correction is gradually reduced rather than abruptly stopped, thereby maintaining system stability while ensuring reliability
Solution Approach 2:
The correction amount subtraction unit pre-establishes a gradual reduction mechanism for the energization time correction amount when abnormality is detected, cushioning the transition to prevent sudden changes that would cause A/F roughness, while still ultimately stopping the correction to maintain system reliability
2Loss of energy
If the energization time correction is continuously applied to maintain injection quantity, then the fuel efficiency is improved, but the A/F value deteriorates when correction amount exceeds limits causing A/F roughness
Solution Approach 1:
The abnormality determination unit continuously monitors the correction amount and provides feedback to the correction amount subtraction unit, which adjusts the energization time correction accordingly, creating a closed-loop control system that prevents excessive correction while maintaining fuel efficiency
Solution Approach 2:
The system changes the correction amount parameter from continuous application to gradual reduction based on abnormality detection, transitioning the energization time correction parameter dynamically to prevent A/F roughness while optimizing fuel efficiency
Data Source
AI summary
An injection control device includes: a drive control unit that controls energization by correcting an energization instruction time when injecting the fuel by executing the current-drive, and includes an energization time correction amount calculation unit that calculates an energization time correction amount by performing area correction on a current flowing through the fuel injection valve; an abnormality determination unit that determines an abnormality in a control system of the drive control unit; and a correction amount subtraction setting unit that stops a calculation of the energization time correction amount when the abnormality determination unit determines an abnormality, and controls the drive control unit to directly or stepwise reduce the energization time correction amount at an abnormality determination.