Dynamic Emission Warning Threshold for Injection Timing Deviation
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Solution Overview
Problem
Direct injection internal combustion engines face challenges in accurately informing drivers of exhaust emission deterioration due to variations in injection timing, leading to unnecessary warning light activation even when emission deterioration is minimal.
Innovation Solution
An emission deterioration informing device with actual injection timing sensing, deviation amount calculation, and impact state determination sections, which only activates the warning light when the deviation exceeds a threshold value and the engine is in an impact state, adjusting the threshold value based on the engine's operational state to minimize false alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the warning light is activated whenever the injection timing deviation exceeds a predetermined threshold value, then the exhaust emission deterioration can be informed, but unnecessary warnings are generated when the engine is not in an impact state
Solution Approach 1:
The system changes the threshold value parameter dynamically based on the engine's operational state. When the engine is in an impact state (e.g., cold start, catalyst warm-up), a lower threshold is used to ensure sensitive detection of emission deterioration. When not in impact state, a higher threshold is applied to avoid unnecessary warnings. This parameter adaptation resolves the contradiction by making the warning system both sensitive and selective.
Solution Approach 2:
The warning system transitions from a static threshold-based approach to a dynamic approach where the threshold value changes according to real-time engine state detection. The control unit continuously monitors engine operating conditions and adjusts the threshold accordingly, allowing the system to adapt its sensitivity to emission deterioration based on current operational context, thereby reducing false alarms while maintaining detection reliability.
2Device complexity
If a fixed threshold value is used for injection timing deviation, then the warning system is simple to implement, but it cannot distinguish between impact states and non-impact states
Solution Approach 1:
The system introduces dynamic adaptability by having the threshold value change based on engine state detection. The control unit monitors operational parameters (coolant temperature, catalyst temperature, etc.) and automatically adjusts the threshold accordingly. This dynamic mechanism adds versatility without requiring complex hardware modifications, maintaining implementation simplicity while achieving state-aware operation.
Solution Approach 2:
The system changes the threshold parameter based on detected engine state conditions. By monitoring parameters such as coolant temperature and catalyst temperature, the control unit determines whether the engine is in an impact state and adjusts the threshold value accordingly. This parameter adaptation enables the system to distinguish between different operational contexts without adding significant structural complexity.
3Reliability
If the warning light is activated for all injection timing deviations above threshold, then all emission deterioration cases are caught, but the false alarm rate increases during non-impact states
Solution Approach 1:
The system changes the detection threshold parameter based on engine operational state. During impact states (cold engine, catalyst not active), a lower threshold is used to ensure reliable detection of actual emission deterioration. During non-impact states, a higher threshold is applied to filter out false alarms. This dynamic parameter adjustment resolves the contradiction by making detection sensitivity context-dependent.
Solution Approach 2:
The control unit continuously monitors engine operating conditions (coolant temperature, catalyst temperature, injection timing) and uses this feedback to determine whether the engine is in an impact state. Based on this feedback, the system dynamically adjusts the warning threshold, ensuring that warnings are only issued when truly necessary, thereby reducing false information while maintaining detection reliability.
Data Source
AI summary
An emission deterioration informing device senses actual injection timing, at which fuel injection is actually performed from an injector. The device calculates a deviation amount of the sensed actual injection timing from target injection timing. The device has a warning light for informing deterioration of exhaust emission when the calculated deviation amount is larger than a predetermined threshold value. The device determines whether an operation state of an internal combustion engine is an impact state, in which the exhaust emission receives a predetermined influence or more from the deviation of the actual injection timing from the target injection timing. The device allows lighting of the warning light when the operation state is determined to be the impact state. The device prohibits the lighting of the warning light when the operation state is not determined to be the impact state.