Engine Control Apparatus Fuel Injection Correction
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Solution Overview
Problem
Existing control systems for internal combustion engines face challenges in precisely adjusting fuel injection amounts to account for fuel adherence to intake systems, leading to excessive combustion energy when feedback processes are stopped, especially at low temperatures.
Innovation Solution
A control apparatus that performs a low-temperature increase process to correct fuel injection amounts, followed by a stop decrease process to prevent excessive fuel burning, using a correction coefficient and integrated air amount to manage fluctuations and determine when to initiate the stop decrease process, and includes a temperature-based adjustment of the increase correction amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the injection amount is increased through open-loop control to compensate for fuel adherence to the intake system, then the fuel compensation is improved, but the amount of fuel in the air-fuel mixture becomes excessively large when the feedback process is stopped
Solution Approach 1:
The patent applies feedback control by continuously monitoring the air-fuel ratio sensor output and adjusting the injection amount correction coefficient accordingly. When the feedback process is stopped, the system uses the last correction coefficient value to prevent excessive fuel injection, thereby resolving the contradiction between compensating for fuel adherence and preventing excessive combustion energy.
Solution Approach 2:
The injection amount correction coefficient is dynamically adjusted based on the operating state of the feedback process. The system transitions between different control modes (feedback active vs. feedback stopped) and adjusts the correction coefficient accordingly, allowing the system to adapt to changing conditions and prevent excessive fuel injection when feedback is stopped.
2Device complexity
If the feedback process is stopped to simplify control, then the control complexity is reduced, but the injection amount cannot be precisely adjusted to account for fuel adherence
Solution Approach 1:
The system performs preliminary action by calculating and storing the correction coefficient before stopping the feedback process. This pre-calculated coefficient is then used when feedback is stopped, allowing the system to maintain precise injection amount adjustment without requiring continuous feedback processing, thus reducing control complexity while preserving precision.
3Reliability
If the injection amount is increased at low temperature to compensate for fuel adherence, then the cold start performance is improved, but the exhaust system may overheat when feedback is stopped
Solution Approach 1:
The system applies preliminary anti-action by using the correction coefficient from the feedback process to counteract the potential harmful effect of excessive fuel injection. When feedback is stopped, the pre-calculated correction coefficient prevents excessive fuel burning that would lead to exhaust system overheating, while still maintaining adequate fuel compensation for cold start conditions.
Data Source
AI summary
A CPU increases an injection amount when a coolant temperature of an internal combustion engine is equal to or lower than a predetermined temperature. The CPU corrects the injection amount to control an air-fuel ratio to a target value in a feedback manner. The CPU performs a temperature raising process for a GPF, by stopping fuel injection in a second cylinder and making the air-fuel ratio of an air-fuel mixture in first, third, and fourth cylinders richer than a theoretical air-fuel ratio. In performing the temperature raising process, the CPU stops a feedback process of the air-fuel ratio. In performing the temperature raising process, the CPU corrects the injection amount in a decreasing manner in accordance with an operation amount of the feedback process before the performance of the temperature raising process.