Engine Control Device Fuel Injection Cut Diagnosis
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Solution Overview
Problem
The internal combustion engine control device cannot accurately distinguish between normal operation and abnormality in the fuel injection cut function, leading to incorrect diagnosis and potential engine startup prohibition, even when the fuel injection cut function is functioning properly.
Innovation Solution
The control device transmits a drive prohibition signal to the fuel injection valve drive circuit before engine startup and monitors the drive current to ensure the fuel injection cut function is functioning correctly by using a diagnostic drive signal, allowing for accurate diagnosis of the fuel injection cut function's normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device monitors the signal state of the operating state monitoring port to diagnose the fuel injection cut function, then the diagnosis function is provided, but the control device cannot distinguish between normal operation and abnormality, leading to incorrect diagnosis
Solution Approach 1:
The patent introduces a drive current detection mechanism as an intermediary to verify the actual operation state of the fuel injection valve. By detecting whether drive current is supplied to the fuel injection valve during the diagnosis period, the system can distinguish between normal fuel injection cut operation and abnormal drive circuit operation, resolving the ambiguity in signal state monitoring
Solution Approach 2:
The system implements feedback by monitoring the drive current state and using this information to determine the normality of the fuel injection cut function. The control device receives feedback from the drive current detection result and makes decisions about engine startup prohibition based on this feedback, enabling accurate diagnosis
2Reliability
If the control device prohibits engine startup when fuel injection cut function abnormality is detected, then engine safety is ensured, but unnecessary startup prohibition occurs when the function is actually normal
Solution Approach 1:
The patent performs preliminary diagnosis of the fuel injection cut function before allowing engine startup. By conducting the drive current detection and normality determination in advance during the diagnosis period, the system ensures that only engines with properly functioning fuel injection cut systems are permitted to start, preventing both unsafe operation and false rejections
3Adaptability or versatility
If the control device uses signal state monitoring for diagnosis, then the diagnosis function is implemented, but the diagnosis result is ambiguous and cannot differentiate between normal and abnormal states
Solution Approach 1:
The patent replaces the electrical signal state monitoring method with a drive current detection method. Instead of monitoring the operating state monitoring port signal, the system directly detects the drive current supplied to the fuel injection valve, providing a more precise and unambiguous indication of the valve's actual operation state
Data Source
AI summary
An internal combustion engine control device that can ensure diagnosis of whether a fuel injection cut function normally works and that further permits startup of an internal combustion engine in a case in which the fuel injection cut function normally works is provided. To attain the internal combustion engine control system, the startup of the internal combustion engine is prohibited when carrying of a diagnostic monitoring current based on a diagnostic drive signal related to each of fuel injection valves to each of fuel injection valves in a case of transmitting a drive prohibition signal related to each of fuel injection valves to a fuel injection valve drive circuit before the startup of the internal combustion engine and transmitting the diagnostic drive signal related to each of fuel injection valves to the fuel injection valve drive circuit. By transmitting the diagnostic drive signal related to each of the fuel injection valves to the fuel injection valve drive circuit and monitoring whether the diagnostic monitoring current based on the diagnostic drive signal is carried to each of fuel injection valves, it is possible to ensure diagnosis of whether the fuel injection cut function normally works.