Engine Air Fuel Ratio Control via Closed Loop Feedback
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Solution Overview
Problem
Existing engine control methods fail to optimally regulate the fuel/air ratio in combustion engines, leading to inefficient energy use and increased pollutant production, especially under varying operating conditions and across different vehicle and engine types.
Innovation Solution
A closed-loop control method that adjusts fuel injector pulse duration based on real-time air/fuel ratio feedback from sensors, using a PI controller to correct deviations and an adaptation matrix for long-term adjustments, allowing for dynamic regulation and adaptation to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open-loop control is used for fuel/air ratio regulation, then control simplicity is maintained, but energy efficiency and pollutant minimization deteriorate
Solution Approach 1:
The patent implements closed-loop control by continuously monitoring the actual air/fuel ratio via oxygen sensors in the exhaust system and comparing it with the target ratio. The control unit adjusts fuel injector pulse duration based on this feedback, enabling dynamic optimization of energy efficiency and pollutant emission while maintaining acceptable control complexity through algorithmic processing.
2Device complexity
If fixed control parameters are used, then control system simplicity is maintained, but adaptability to varying engine conditions and vehicle types deteriorates
Solution Approach 1:
The patent employs dynamic control parameters that automatically adapt to varying engine operating conditions such as load, speed, and temperature. The control unit modifies fuel injection parameters in real-time based on sensor inputs, enabling the system to optimize performance across different vehicle types and operating scenarios without requiring complex manual reconfiguration.
Solution Approach 2:
The system dynamically adjusts key parameters including fuel injector pulse duration, injection pressure, and timing based on real-time sensor data. This parameter adaptation allows the control system to optimize the air/fuel ratio under varying conditions while maintaining a relatively simple control architecture through automated parameter modification.
3Loss of energy
If frequent adjustments are made to optimize air/fuel ratio, then energy efficiency and emission control are improved, but system response time and stability deteriorate
Solution Approach 1:
The control system employs periodic sampling and processing of sensor data at optimized intervals rather than continuous adjustment. The control unit evaluates sensor inputs and adjusts fuel injection parameters at discrete, strategically timed moments, balancing the need for frequent optimization with system response capabilities and stability requirements.
Data Source
AI summary
A method is specified for controlling a combustion engine in a motor vehicle, namely for optimally adjusting an air/fuel ratio which is distinguished in that the air/fuel ratio is the result of a regulation process. Individual aspects of the invention further address a regulation method particularly suitable for such regulation in consideration of the available input values and readings. For the purposes of supporting regulation, an adaptation method is specified which can also be used independently of the regulation method or with other regulation methods and which enables the regulation to be continuously adapted to the respective operating conditions, such as, for example, the engine operational performance, and signs of wear and tear and disruptions due to deposits etc. which accompany it.