Engine Controller Anomaly Detection for Fuel Economy
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Solution Overview
Problem
In internal combustion engines with automatic stop and start capabilities, the existing anomaly determination processes for direct and port injection systems often require continuous operation of these systems to detect anomalies, which reduces opportunities for automatic stop and can deteriorate fuel economy, even when the systems are functioning normally.
Innovation Solution
A controller that switches between direct injection, port injection, and dual injection modes based on engine operational states, and includes a provisional determination process to identify potential anomalies in each system, allowing for an idle determination process to focus on the suspected system during idle operation, thereby reducing unnecessary automatic stop prohibitions and maintaining fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anomaly determination process requires continuous operation of the direct injection system or port injection system to detect anomalies, then the reliability of anomaly detection is improved, but the fuel economy deteriorates due to reduced automatic stop opportunities
Solution Approach 1:
The controller executes a provisional determination process before the anomaly determination process to identify which injection system may have an anomaly. This preliminary action allows the system to prepare for targeted anomaly detection only when necessary, rather than continuously operating both systems for anomaly detection purposes.
Solution Approach 2:
The anomaly detection process is segmented into two stages: provisional determination and actual anomaly determination. The provisional determination process identifies suspected systems, and only those systems undergo the full anomaly determination process. This segmentation reduces unnecessary continuous operation of normal systems.
2Reliability
If the automatic stop is prohibited until the anomaly determination process is completed, then the reliability of ensuring normal injection system operation is improved, but the productivity deteriorates due to reduced automatic stop performance opportunities
Solution Approach 1:
The provisional determination process serves as a preliminary action that identifies which injection system may have an anomaly before committing to the full anomaly determination process. This allows the controller to make informed decisions about whether to prohibit automatic stop, based on actual risk assessment rather than blanket prohibition.
Solution Approach 2:
The control strategy dynamically adjusts based on provisional determination results. When no anomaly is provisionally determined, automatic stop is permitted. When an anomaly is provisionally determined, automatic stop is prohibited only for the duration needed to complete anomaly determination on the suspected system, making the prohibition dynamic rather than static.
3Measurement precision
If the anomaly determination process is executed for both direct injection system and port injection system during idle operation, then the measurement precision of anomaly detection is improved, but the time required for anomaly determination increases
Solution Approach 1:
The anomaly detection workload is segmented based on provisional determination results. Only the injection system provisionally determined to have a potential anomaly undergoes the full anomaly determination process. Normal systems are excluded from this time-consuming process, reducing overall determination time while maintaining detection precision for suspected systems.
Solution Approach 2:
The anomaly determination process is extracted and applied selectively only to the injection system identified by the provisional determination process. Instead of universally applying the time-consuming anomaly determination to both systems, the process is extracted and targeted only where needed, reducing total determination time.
Data Source
AI summary
A controller for an internal combustion engine is configured to execute: a process of switching the injection mode according to an engine operational state; an anomaly determination process of determining whether there is an anomaly in the injection system that is implementing a single injection mode during implementation of the single injection mode; a provisional determination process of provisionally determining whether there may be an anomaly in the injection system that is implementing the single injection mode during the implementation of the single injection mode; and an idle determination process of, if it is determined that there is an anomaly in the provisional determination process, prohibiting the automatic stop and executing, during an idle operation, the anomaly determination process by implementing an injection mode that uses only the injection system provisionally determined to have an anomaly in the provisional determination process.