Engine Controller Cylinder Determination Feedback
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Solution Overview
Problem
Existing internal-combustion engine controllers fail to accurately determine whether injected fuel is introduced into the cylinder, leading to fuel shortages during starting, causing misfire or emission deterioration due to mismatched cylinder determinations between different units.
Innovation Solution
An internal-combustion engine controller that includes a cylinder-determining information storing unit, an actual stroke-determining unit, and a fuel injection-controlling unit, which determines the actual stroke and adjusts fuel injection based on driving conditions and combustion timing to ensure accurate fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel injection is controlled based on cylinder determination by the first determination unit, then fuel injection timing is determined, but mismatch with the second determination unit causes incorrect fuel delivery
Solution Approach 1:
The control device introduces a feedback mechanism where the actual stroke determination result is used to verify and correct the cylinder determination made by the first determination unit. The injection timing determination unit compares the predetermined cylinder with the actually determined cylinder, and adjusts the fuel injection control accordingly to ensure accurate fuel delivery.
Solution Approach 2:
The system performs preliminary cylinder determination using the first determination unit before actual stroke determination, then uses the actual stroke result to verify and correct any mismatches. This preliminary action allows the system to proactively identify and correct determination errors before they affect fuel injection accuracy.
2Object-generated harmful factors
If fuel amount is reduced for the next cycle to compensate for potential mismatch, then over-injection is prevented, but fuel shortage occurs causing misfire
Solution Approach 1:
The system uses feedback from the actual stroke determination to accurately assess whether fuel was properly delivered in the previous cycle. Based on this accurate feedback, the control device makes informed decisions about next-cycle fuel injection amounts, avoiding both over-injection and under-injection that would lead to misfire or emission problems.
Solution Approach 2:
The control device performs preliminary verification of cylinder determination accuracy before committing to fuel injection amount adjustments. By first determining the actual stroke and comparing it with the predetermined cylinder, the system can accurately identify mismatches and adjust fuel amounts accordingly, preventing both over-injection and under-injection.
3Speed
If fuel injection is performed based on predetermined cylinder without verification, then injection speed is maintained, but incorrect cylinder injection occurs
Solution Approach 1:
The system introduces a verification feedback loop where the actual stroke determination result is used to confirm the correctness of the predetermined cylinder before fuel injection. The injection timing determination unit provides this feedback, allowing the control device to verify cylinder identification without significantly delaying the fuel injection process.
Solution Approach 2:
The control device performs preliminary cylinder verification using the actual stroke determination before executing fuel injection. This preliminary action ensures that the predetermined cylinder is correctly identified, allowing the system to maintain high injection speed while ensuring accurate cylinder identification through advance verification.
Data Source
AI summary
Disclosed is an internal-combustion engine controller capable of improving emission characteristics at a start of an internal-combustion engine. When injection during an exhaust stroke is controlled in a port-injection engine, the engine controller ECU performs the first fuel injection during t1 to t2 according to a memory-based crank angle as illustrated in FIG. 12(b) at a fuel injection timing before determination of an actual stroke. Thus, the injected fuel has been introduced into a cylinder during the actual stroke. If fuel is not injected during t1N to t3N within the next exhaust stroke as denoted by the solid line, this causes misfire in the cylinder, so that the engine rotation at the start cannot be smooth. Thus, the ECU clears a finished fuel injection flag (F_INJ) at an incorrect crank angle storage determination timing (tJUD) as denoted by the dashed-dotted line, thereby capable of controlling the fuel injection.