Injector Control Unit Current Cutoff Mechanism
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Solution Overview
Problem
Existing fuel injection systems face challenges in preventing unintended fuel injection due to abnormalities in the driver or pre-driver circuits, leading to energization issues until the control units become controllable.
Innovation Solution
An injector control unit with a current cutoff mechanism that de-energizes the injector drivers during abnormal conditions, utilizing an arithmetic unit to control the current cutoff mechanism via a dedicated control signal line, ensuring the drivers are only energized during the engine drive period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current cutoff mechanism is provided upstream of the driver to stop unintended energization, then safety during abnormal conditions is improved, but the system complexity increases due to additional control components and signal lines
Solution Approach 1:
A dedicated current cutoff mechanism control signal line is introduced as an intermediary between the arithmetic unit and the current cutoff mechanism. This separate control path enables independent management of the cutoff function, allowing the system to achieve enhanced safety through explicit fail-safe control without requiring complex integration with existing control pathways.
2Ease of operation
If the current cutoff mechanism is controlled by the arithmetic unit via a dedicated signal line, then precise control during engine drive period is improved, but the device complexity increases due to additional control pathways
Solution Approach 1:
The control system is segmented into distinct functional pathways: a dedicated current cutoff mechanism control signal line for fail-safe control, separate from the normal driver control signal path. This segmentation allows precise control of the cutoff mechanism during the engine drive period while maintaining simplicity in each individual control pathway, avoiding the complexity that would arise from integrating multiple functions into a single control line.
Data Source
AI summary
Provided is an injector control unit capable of preventing unintended fuel injection other than an engine drive period. The injector control unit includes a cutoff mechanism for cutting off current supply to the injector from at least the ignition OFF to the next ignition ON.