Engine Controller Ignition Timing Feedback Control
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Solution Overview
Problem
Conventional internal combustion engine controllers face challenges in accurately controlling combustion conditions, particularly with varying fuel ratios, which affect ignition timing and fuel efficiency, leading to suboptimal exhaust gas characteristics and fuel mileage.
Innovation Solution
A controller that includes a combustion condition parameter obtaining unit, a fuel ratio parameter obtaining unit, and an ignition timing calculator, using feedback control to set and adjust ignition timing based on the fuel ratio, ensuring the combustion condition meets a target value, thereby enhancing fuel efficiency and exhaust gas characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ignition timing control is used, then the control system is simple, but combustion conditions cannot be accurately controlled with varying fuel ratios, leading to suboptimal exhaust gas characteristics and fuel mileage
Solution Approach 1:
The patent implements feedback control by detecting the actual combustion condition parameter (such as in-cylinder pressure or temperature) and comparing it with the target value. The ignition timing is then adjusted based on the deviation between actual and target values, forming a closed-loop control system that accurately maintains combustion conditions despite variations in fuel ratio.
Solution Approach 2:
The patent dynamically adjusts ignition timing as a controllable parameter in response to changes in fuel ratio and combustion condition. By treating ignition timing as a variable parameter rather than a fixed value, the system adapts to varying fuel compositions and maintains optimal combustion performance across different operating conditions.
2Productivity
If ignition timing is adjusted based on fuel ratio, then fuel mileage and exhaust gas characteristics improve, but the control system becomes more complex
Solution Approach 1:
The controller is designed to perform multiple functions: detecting combustion condition parameters, calculating fuel ratio, determining target combustion parameters, and adjusting ignition timing. This multi-functional approach consolidates what could be separate systems into a single integrated controller, achieving improved fuel efficiency without proportionally increasing overall system complexity.
Solution Approach 2:
The control system uses its own detected combustion condition data and calculated fuel ratio to automatically adjust ignition timing without requiring external intervention. The system serves itself by using internal sensors and processors to make real-time adjustments, eliminating the need for additional external control devices.
3Manufacturing precision
If target combustion condition is set depending on fuel ratio, then combustion performance optimizes, but calculation complexity increases
Solution Approach 1:
The patent pre-establishes the relationship between fuel ratio and target combustion condition parameters through calculation or lookup tables. By preparing target values in advance based on expected fuel ratios, the system reduces real-time calculation complexity while maintaining precision in combustion control.
Solution Approach 2:
The patent replaces complex mechanical or empirical tuning methods with computational calculations. Using the processor to calculate target combustion conditions based on detected fuel ratio eliminates the need for physical trial-and-error adjustments, achieving high precision through mathematical relationships rather than mechanical complexity.
Data Source
AI summary
A controller for an internal combustion engine includes a detector and a processor. The detector detects a combustion condition of a gas in a cylinder of the internal combustion engine. The processor is configured to calculate a fuel ratio in the gas in the cylinder. The processor is configured to calculate a target combustion condition according to the fuel ratio. The processor is configured to calculate an ignition timing such that the combustion condition detected by the detector becomes equal to the target combustion condition.