Fuel Injection Control Device Area Correction Abnormality Detection
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Solution Overview
Problem
Existing injection control devices for internal combustion engines face challenges in determining whether an abnormal state related to area correction has returned to a normal state without causing emission deterioration, particularly in microinjection systems where high injection accuracy is critical for fuel efficiency and reducing harmful emissions.
Innovation Solution
The proposed injection control device includes an electronic control unit with a microcomputer, control IC, and current detector that calculates a correction time to adjust the energization time of the fuel injection valve, allowing for area correction control to ensure accurate fuel injection, and includes mechanisms to determine if an abnormality has occurred and if it has returned to a normal state by monitoring the correction time and comparing it to an upper limit value, thereby preventing continuous abnormal area correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If area correction control is continuously performed to compensate for fuel injection amount shortages, then injection accuracy is improved, but emission deterioration may occur when abnormalities persist
Solution Approach 1:
The system continuously monitors the correction time and compares it against an upper limit value to detect abnormalities. When the correction time exceeds the threshold, the system identifies an abnormal state and stops area correction control to prevent emission deterioration. This feedback mechanism enables dynamic adjustment of correction control based on real-time system status.
Solution Approach 2:
The area correction control is designed to be dynamically adjustable - it is activated when fuel injection amount shortages are detected and deactivated when abnormalities are identified. This dynamic control strategy allows the system to optimize injection accuracy during normal operation while preventing emission deterioration during abnormal conditions.
2Object-generated harmful factors
If area correction control is stopped to prevent emission deterioration, then emission compliance is maintained, but injection accuracy may deteriorate
Solution Approach 1:
The system uses feedback monitoring of correction time to determine when to activate or deactivate area correction control. When the correction time remains below the upper limit value, area correction is maintained to ensure injection accuracy. When the threshold is exceeded, the system switches to a state that prioritizes emission compliance.
Solution Approach 2:
The system changes the operational parameters of area correction control based on the detected state. In normal operation, full area correction is applied to maintain injection accuracy. When abnormalities are detected, the parameter changes to limit or stop area correction, thereby ensuring emission compliance while minimizing the impact on injection accuracy.
3Manufacturing precision
If abnormal area correction is continuously performed, then fuel injection amount compensation is improved, but system reliability deteriorates due to emission violations
Solution Approach 1:
The system performs preliminary detection by continuously monitoring correction time and comparing it against the upper limit value before emission deterioration occurs. When the correction time approaches or exceeds the threshold, the system proactively stops area correction control to prevent emission violations, thereby maintaining system reliability.
Solution Approach 2:
Continuous feedback monitoring of the correction time enables the system to detect abnormal conditions and switch control modes appropriately. This feedback mechanism ensures that area correction control is maintained during normal operation for accurate fuel injection compensation, while automatically preventing emission violations when abnormalities are detected.
Data Source
AI summary
An injection control device includes: an instruction output unit outputting an instruction energization time that is an instruction value of an energization time of a fuel injection valve corresponding to a target injection amount; an energization controller controlling energization of the fuel injection valve based on the instruction energization time; an area corrector correcting an area of an electric current flowing through the fuel injection valve when the fuel injection valve is driven by the electric current, calculating a correction time of the energization time, and correcting the instruction energization time; an abnormality determiner determining that an abnormality related to the area correction has occurred when the correction time reaches a predetermined upper limit value; and a normal-return determiner executing, after the abnormality determiner determines that the abnormality related to the area correction has occurred, a normal-return determination at an execution timing of when a degree of influence of the abnormality on an emission becomes equal to or less than a predetermined value, for determining whether or not an abnormal state in which the abnormality related to the area correction has been caused has returned to a normal state.