Combustion Control Device Fuel Property Estimation
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Solution Overview
Problem
Conventional combustion system control devices face limitations in achieving optimal control due to variations in fuel properties, such as dynamic viscosity, density, and component mixing ratios, which are not accurately reflected by dynamic viscosity sensors alone.
Innovation Solution
A combustion system control device that includes a first estimation unit for estimating fuel mixing ratios and properties based on combustion parameters, a second estimation unit for estimating these values based on property sensors, and a comparison/selection unit to choose the estimation value with higher accuracy, allowing for more precise control of the combustion system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dynamic viscosity sensor is used to detect fuel properties, then control contents can be corrected based on detection results, but the components and mixing ratios of fuel cannot be accurately determined leading to limited optimal control
Solution Approach 1:
The patent segments the fuel property detection into two independent parts: (1) dynamic viscosity detection using a dynamic viscosity sensor, and (2) density detection using a density sensor. Each sensor measures a specific physical property independently. By segmenting the detection approach, the system can capture different aspects of fuel composition that neither sensor alone could provide, enabling more accurate determination of fuel components and mixing ratios for optimal control.
Solution Approach 2:
The patent combines detection results from two different sensing approaches (dynamic viscosity sensing and density sensing) to create a composite fuel property assessment. By integrating multiple detection modalities, the system achieves a more comprehensive understanding of fuel composition, allowing for accurate identification of fuel components and mixing ratios despite variations in mining location and refinery processes.
2Device complexity
If control is based on single parameter detection, then device complexity is reduced, but estimation accuracy of fuel mixing ratios and properties deteriorates
Solution Approach 1:
The patent implements a dual-function detection system where the fuel property detection apparatus performs both dynamic viscosity measurement and density measurement. By making the detection system multi-functional, the apparatus can simultaneously or separately assess different fuel properties, improving the accuracy of mixing ratio estimation without requiring entirely separate detection systems for each parameter.
Solution Approach 2:
The patent introduces a property map as an intermediary that correlates dynamic viscosity and density values with fuel mixing ratios. This property map serves as a bridge between the physical measurements and the chemical composition analysis, allowing the system to estimate mixing ratios accurately by referencing pre-established relationships between physical properties and fuel composition.
Data Source
AI summary
An ECU, as a combustion system control device, includes various control units such as a first estimation unit, a second estimation unit, a comparison/selection unit, and an injection control unit. The first estimation unit estimates, as a first estimation value, the mixing ratio of each molecular structure species contained in fuel based on the value detected by an in-cylinder pressure sensor that is a combustion sensor. The second estimation unit estimates, as a second estimation value, the above mixing ratio based on the values detected by a density sensor and a dynamic viscosity sensor that are property sensors. The comparison/selection unit compares the first estimation value with the second estimation value to select an estimation value with higher estimation accuracy, and various control units such as the injection control unit control the operation of a combustion system by using the selected estimation value.