Fuel Injection Control Device Abnormality Detection
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Solution Overview
Problem
Existing injection control devices face challenges in achieving high injection accuracy due to fluctuations in drive voltage, affecting the minute injection amount and requiring improved methods to ensure normal implementation of current area correction techniques.
Innovation Solution
An injection control device is designed with an area correction unit, estimation unit, and comparison unit to calculate and verify the energization time correction amount, determining abnormality and ensuring proper current area correction for the fuel injection valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current area correction is implemented to improve injection accuracy, then injection precision improves, but system complexity increases due to additional correction calculations
Solution Approach 1:
The system implements feedback by comparing the correction amount calculated by the area correction unit with the correction amount calculated by the estimation unit. This feedback mechanism verifies the normal implementation of area correction and detects abnormalities, thereby maintaining injection accuracy while providing a self-checking capability that reduces the need for external monitoring systems.
Solution Approach 2:
The estimation unit independently calculates an estimated correction amount without requiring external intervention. This self-service approach allows the system to self-verify its operation by comparing two independently calculated values, ensuring injection accuracy while avoiding the need for additional external monitoring equipment.
2Reliability
If independent estimation and comparison of correction amounts is added to detect abnormalities, then reliability improves, but device complexity increases
Solution Approach 1:
The abnormality detection function is merged with the existing control units. The estimation unit and comparison unit are integrated into the control structure, allowing the system to perform both correction calculation and abnormality detection within the same control architecture. This merging approach enhances reliability by enabling self-verification while avoiding the need for separate external monitoring systems.
Solution Approach 2:
The control units are designed to perform multiple functions: the area correction unit calculates correction amounts for injection control, while the estimation unit independently calculates estimated correction amounts, and the comparison unit compares both values to detect abnormalities. This multi-functionality approach enhances system reliability without requiring separate dedicated monitoring equipment.
3Object-affected harmful factors
If minute injection amounts are used to meet emission regulations, then emission compliance improves, but sensitivity to voltage fluctuations increases affecting injection accuracy
Solution Approach 1:
The system dynamically adjusts the energization time parameter based on calculated correction amounts to compensate for voltage fluctuations. By changing the energization time parameter in response to detected abnormalities, the system maintains precise control over minute injection amounts, ensuring both emission compliance and injection accuracy despite voltage variations.
Solution Approach 2:
The feedback mechanism compares correction amounts from different calculation methods to detect voltage-induced abnormalities. When voltage fluctuations affect minute injection amounts, the feedback system identifies the discrepancy and triggers abnormality determination, allowing the system to adjust parameters and maintain injection accuracy while meeting emission requirements.
Data Source
AI summary
An injection control device includes: an area correction unit that calculates an energization time correction amount when executing a current drive of the fuel injection valve to inject a fuel from the fuel injection valve; an estimation unit that independently calculates an estimated energization time correction amount; a comparison unit that compares the energization time correction amount c with the estimated energization time correction amount; and a first abnormality determination unit that determines that the energization time correction amount is abnormal.