Engine Control Device Combustion State Determination
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Solution Overview
Problem
The variation in combustion state after engine start due to uncertainties in integrated intake air amount and environmental temperature leads to inconsistent target equivalent ratios, affecting engine operation.
Innovation Solution
An engine control device with a determination unit to confirm complete combustion, a calculation unit to determine integrated intake air amount, a setting unit to adjust target equivalent ratios based on temperature and intake air, and a control unit to manage air-fuel mixture ratios, ensuring consistent combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integrated intake air amount is calculated from the start of cranking, then the engine can be started, but the target equivalent ratio may vary due to uncertain combustion completion time
Solution Approach 1:
The determination unit performs preliminary detection to identify when complete combustion is achieved before the calculation unit begins integrating intake air amount. This preliminary action ensures that the integration starts at the correct moment, eliminating timing uncertainty in target equivalent ratio calculation.
Solution Approach 2:
The determination unit continuously monitors combustion state and provides feedback to the calculation unit. When complete combustion is detected, the feedback signal triggers the start of integrated intake air amount calculation, ensuring accurate timing and consistent target equivalent ratio regardless of combustion duration variations.
2Ease of operation
If the target equivalent ratio is set based on integrated intake air amount from cranking start, then engine start is simplified, but combustion state variation occurs due to temperature and timing factors
Solution Approach 1:
The determination unit provides real-time feedback on combustion completion status, enabling the calculation unit to accurately determine when to start integrating intake air amount. This feedback mechanism ensures that target equivalent ratio is set based on actual combustion state rather than fixed timing, maintaining combustion stability while keeping the start procedure simple.
Solution Approach 2:
The system dynamically adjusts the start timing of integrated intake air amount calculation based on actual combustion completion detection. Instead of using fixed timing from cranking start, the integration begins dynamically when complete combustion is achieved, adapting to varying combustion conditions while maintaining operational simplicity.
Data Source
AI summary
An engine control device includes a determination unit configured to determine whether or not an engine is in a complete explosion state, a calculation unit configured to calculate an integrated intake air amount that is an integrated value of an intake air amount of the engine after an affirmative determination is made by the determination unit, a setting unit configured to set a target equivalent ratio of the engine in accordance with the integrated intake air amount, and a control unit configured to control an intake air amount and a fuel injection amount of the engine such that an equivalent ratio of an air-fuel mixture becomes the target equivalent ratio.