Fuel Injection Control via Cylinder Wall Temperature
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Solution Overview
Problem
Internal combustion engines face challenges in accurately controlling fuel injection into the combustion chamber, leading to increased emissions due to variations in combustion chamber temperature, which existing methods fail to address effectively.
Innovation Solution
A method and apparatus that ascertain the injection mode for fuel into a combustion chamber based on the engine speed and cylinder wall temperature, using a thermodynamic cylinder wall temperature model to determine dynamic cylinder wall temperature, allowing for precise selection between multiple or single injection modes without relying on coolant or exhaust-gas temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fuel injection timing and mode are not precisely controlled, then emissions increase, but implementing precise control requires complex sensor arrangements and multi-dimensional modeling
Solution Approach 1:
The patent extracts the essential control parameter (cylinder wall temperature) from the complex thermal environment of the combustion chamber, using it as a standalone indicator to determine injection mode without requiring comprehensive multi-dimensional thermal modeling or multiple sensors. This simplifies the control system while maintaining effective emission reduction.
Solution Approach 2:
The system uses the cylinder wall temperature, which is naturally present during engine operation, as a self-indicating parameter for injection control. Rather than requiring external sensors to measure combustion chamber conditions, the method leverages the existing thermal state of the cylinder wall to automatically determine the appropriate injection mode, reducing the need for additional measurement equipment.
2Object-generated harmful factors
If cylinder wall temperature is used to determine injection mode, then emission control improves, but temperature measurement and modeling complexity increases
Solution Approach 1:
The patent changes the approach from using complex multi-dimensional temperature fields to using a single scalar parameter (cylinder wall temperature) to characterize the thermal state. This parameter change simplifies the modeling requirement while maintaining the ability to effectively control emissions, as the cylinder wall temperature serves as a representative indicator of the overall thermal environment.
Solution Approach 2:
The method uses a simplified temperature model that can be easily calculated and updated without requiring expensive, complex thermal field simulations. The cylinder wall temperature model serves as a computationally efficient approximation that can be continuously updated during operation, replacing the need for resource-intensive multi-dimensional modeling.
3Productivity
If multiple injection modes are implemented based on temperature conditions, then combustion efficiency improves, but control system complexity increases
Solution Approach 1:
The patent implements a dynamic injection control system that adapts the injection mode (single or multiple injections) based on the real-time cylinder wall temperature and engine speed. This dynamic adjustment allows the system to optimize combustion efficiency under varying operating conditions without requiring a permanently complex control structure, as the complexity is only activated when temperature conditions warrant it.
Solution Approach 2:
The system changes the injection mode parameter (from single to multiple injections) based on the cylinder wall temperature parameter. This parameter-based control strategy allows the system to achieve improved combustion efficiency through simple threshold-based decision logic rather than complex continuous control, reducing the overall control system complexity while maintaining adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces particle emissions and improves combustion efficiency by accurately determining the injection mode based on cylinder wall temperature, eliminating the need for complex sensor arrangements and multi-dimensional modeling, thereby enhancing emission control.
Implementation Method 1
the cylinder wall temperature (ZT) is ascertained by means of a predefined cylinder wall temperature model. In some embodiments, the cylinder wall temperature model is a thermodynamic temperature model.
Data Source
AI summary
Various embodiments include a method for controlling an internal combustion engine comprising: determining a speed of the internal combustion engine; determining a cylinder wall temperature of a combustion cylinder of the internal combustion engine; selecting an injection mode based at least in part on the speed and the cylinder wall temperature; and actuating a fuel injector associated with the combustion cylinder based on the selected injection mode.