Engine Intercooler Cooling Control Using Unified Efficiency Map
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Solution Overview
Problem
Existing control systems for internal combustion engines with water-cooled intercoolers require extensive relation information maps to determine the required circulation flow rate of cooling water, which is time-consuming and labor-intensive, especially when considering variations in outside air conditions.
Innovation Solution
A control apparatus that calculates the required circulation flow rate based on the intercooler cooling efficiency, cooler passing-through gas flow rate, and other parameters, using a simplified relation information map that accounts for changes in intake gas temperature, cooling water temperature, and target outflow gas temperature, allowing for precise control of the cooling water flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple relation information maps are created to account for variations in outside air conditions, then the accuracy of required circulation flow rate determination is improved, but the man hour for creating the maps increases significantly
Solution Approach 1:
The patent combines multiple relation information maps that account for different outside air conditions into a single integrated map. This single map stores the relationship between required circulation flow rate, engine load, and engine speed, eliminating the need to create and manage multiple separate maps while maintaining accurate determination of the required circulation flow rate under varying conditions
Solution Approach 2:
The patent creates a universal relation information map that functions across multiple outside air conditions without requiring separate maps for each condition. This single map structure allows the system to determine the required circulation flow rate accurately regardless of variations in outside air temperature, pressure, or other environmental factors
2Device complexity
If the required circulation flow rate is determined using a single relation information map without considering outside air conditions, then the system complexity is reduced, but the accuracy of cooling control deteriorates
Solution Approach 1:
The patent performs preliminary calculations to determine the required circulation flow rate by combining the single relation information map with detected parameters including outside air conditions, cooler inflow gas temperature, and cooler passing-through gas flow rate. This preliminary determination of required cooling efficiency compensates for the simplicity of the single map structure while maintaining accurate cooling control
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 enables efficient calculation of the required circulation flow rate, reducing the need for extensive mapping and improving the accuracy of cooling water flow rate control, thereby optimizing engine performance and reducing man-hours in data creation.
Implementation Method 1
an intercooler arranged in the cooling water flow circuit and configured to conduct heat exchange between the intake gas and the cooling water
Data Source
AI summary
A control apparatus for an internal combustion engine that includes an intercooler and an electrically driven water pump configured to circulate cooling water so as to flow through the intercooler is configured to calculate a required intercooler cooling efficiency ηreq obtained by dividing a difference between a cooler inflow gas temperature Tgin and a cooler outflow gas temperature Tgout by a difference between the cooler inflow gas temperature Tgin and a cooling water temperature Tw. A required circulation flow rate Qwreq is calculated based on the required intercooler cooling efficiency ηreq and a cooler passing-through gas flow rate G. The electrically driven water pump is driven so that a cooling water flow rate Qw approaches the required intercooler cooling efficiency ηreq.