Internal Combustion Engine Air-Fuel Feedback Restart Using Rich-Peak Detection
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Solution Overview
Problem
Existing air-fuel ratio feedback control systems in internal combustion engines suffer from delays in restarting after a fuel cut, leading to worsened emissions due to manufacturing variations or injector malfunctions, especially when relying on target air-fuel ratio or duration time-based restart criteria.
Innovation Solution
An internal combustion engine control apparatus and method that sets air-fuel ratio criteria based on a rich-side peak value after fuel supply increase during recovery from a fuel cut, allowing quick restart of feedback control without a predetermined time-out period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If air-fuel ratio feedback control restarts based on target air-fuel ratio or duration time, then control simplicity is maintained, but emissions worsen due to delayed restart
Solution Approach 1:
The patent changes the parameter basis for restarting feedback control from target air-fuel ratio or duration time to rich-side peak value detection. This parameter change enables faster and more accurate restart timing, reducing emissions during the transition period after fuel cut recovery while maintaining control simplicity through automated peak detection algorithms.
2Object-generated harmful factors
If feedback control restarts immediately after fuel supply increase, then emissions are improved, but air-fuel ratio deviations occur due to manufacturing variations or injector malfunctions
Solution Approach 1:
The patent applies preliminary action by detecting and recording the rich-side peak value of air-fuel ratio before restarting feedback control. This preliminary detection allows the system to anticipate the appropriate restart timing, enabling immediate control resumption while accounting for potential deviations caused by manufacturing variations or injector issues, thus maintaining both emissions performance and control stability.
3Stability of the object's composition
If a predetermined time-out period is waited before restarting feedback control, then control stability is improved, but productivity is reduced due to extended recovery time
Solution Approach 1:
The patent replaces the mechanical time-based waiting period with an event-driven detection system that identifies the rich-side peak value. This substitution eliminates the need for predetermined time-out periods, allowing feedback control to restart immediately when the peak condition is detected, thereby maintaining control stability while significantly improving recovery speed and overall system productivity.
Data Source
AI summary
Provided is an apparatus and a method for controlling an internal combustion engine such that emissions may not worsen during recovery from a fuel cut. An internal combustion engine control apparatus executes feedback control on the air-fuel ratio of an internal combustion engine. The control apparatus increases a supply of fuel, with the air-fuel ratio feedback stopped, when combustion restarts after a fuel cut of the internal combustion engine. The control apparatus sets the air-fuel ratio criteria based on a rich-side peak value of the air-fuel ratio obtained after the fuel supply increase starts. The control apparatus starts the air-fuel ratio feedback when the air-fuel ratio falls within the set air-fuel ratio criteria after the fuel supply increase.