Combustion Engine Fuel Setting Control for Idle Acceleration
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Solution Overview
Problem
Existing fuel control methods for combustion engines, particularly during idle mode, result in reduced acceleration performance due to periodically extending the closing time of the fuel valve, which complicates ignition controller design and limits control bandwidth.
Innovation Solution
A control unit and method that determine a desired fuel setting by monitoring ignition timing and revolution speed variance, using convex function relationships to optimize fuel settings without relying solely on extended fuel valve closing times, allowing for efficient ignition timing control and improved acceleration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closing time of the fuel valve is periodically extended to make the fuel mixture leaner, then the fuel setting is optimized for emissions and combustion efficiency, but the acceleration performance is reduced during the extended closing time interval
Solution Approach 1:
The patent applies periodic action by using regular perturbations of the fuel valve closing time to probe the system response and determine the desired fuel setting. Instead of continuously extending the closing time, the system uses periodic, small adjustments to measure engine response (RPM changes) and iteratively converges to the optimal fuel setting, thereby avoiding prolonged periods of reduced acceleration performance while still achieving combustion optimization.
2Object-generated harmful factors
If the closing time of the fuel valve is extended to optimize fuel setting, then emissions are reduced and combustion is improved, but the ignition controller design becomes more complex and control bandwidth is limited
Solution Approach 1:
The patent implements feedback by monitoring the engine's response (RPM changes) to fuel valve closing time perturbations and using this information to update the fuel setting. The control unit continuously adjusts the fuel valve closing time based on the measured engine response, creating a closed-loop system that automatically converges to the optimal fuel setting without requiring complex pre-programmed control strategies or limiting the control bandwidth.
Data Source
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AI summary
A method in a combustion engine 100 for determining a desired fuel setting λ+. The method comprises configuring a fuel setting λ, determining a combustion engine parameter β in dependence of the configured fuel setting λ, wherein the combustion engine parameter is related to the fuel setting by a convex function relationship, and updating the fuel setting λ towards the desired fuel setting λ+, based on the determined combustion engine parameter β and on the convex function relationship between the fuel setting λ and the combustion engine parameter β.