Vehicle Controller Engine Component Temperature Estimation
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Solution Overview
Problem
Existing vehicle controllers for internal combustion engines fail to accurately estimate the temperature of engine components, such as exhaust manifolds, due to variations in cooling effects caused by vehicle positioning within a line of vehicles, leading to inaccuracies in heat damage assessment and component lifespan prediction.
Innovation Solution
A controller that calculates a base temperature of the engine component based on driving state information and adjusts it with a correction value reflecting the cooling tendencies of being a leading, trailing, or rearmost vehicle in a line, using vehicle line and rearmost reflection processes to account for airflow differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the controller estimates component temperature based only on driving state and vehicle speed, then the estimation process is simple, but the accuracy is insufficient due to unaccounted vehicle positioning effects in traffic lines
Solution Approach 1:
The patent introduces new parameters (vehicle line position, leading/trailing status, rearmost status) to the temperature estimation model. These additional parameters capture the thermal effects of vehicle positioning in traffic lines, allowing the controller to adjust the correction value based on whether the vehicle is leading, trailing, or rearmost in a line of vehicles, thereby improving estimation accuracy without requiring complete redesign of the estimation system
Solution Approach 2:
The temperature estimation process is segmented into distinct components: base temperature calculation from driving state, correction value calculation from vehicle speed, and reflection adjustments for vehicle line position. This segmentation allows each component to be calculated and adjusted independently, making the complex estimation process manageable and systematic
2Reliability
If the controller does not account for vehicle line position, then the estimation model remains simple, but heat damage assessment becomes inaccurate
Solution Approach 1:
The patent implements feedback mechanisms where the controller continuously monitors vehicle line position and adjusts the temperature correction value accordingly. The system provides feedback about whether the vehicle is leading, trailing, or rearmost in a traffic line, and dynamically modifies the temperature estimation to reflect the actual thermal conditions, improving reliability of heat damage assessment
Solution Approach 2:
The patent applies different correction values based on the specific local position of the vehicle within the traffic line. Leading vehicles receive different correction values than trailing or rearmost vehicles, as each position has distinct thermal characteristics. This local differentiation ensures accurate heat damage assessment for each specific vehicle position scenario
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 solution enhances the accuracy of temperature estimation for engine components by considering the vehicle's position within a line, improving the assessment of heat damage and component lifespan prediction.
Implementation Method 1
Ambient air flows by the component more quickly as the vehicle speed increases. Thus, the temperature of the component tends to be lower at higher vehicle speeds.
Data Source
AI summary
A controller for a vehicle executes a base temperature calculation process that calculates a base temperature of a component of the internal combustion engine, a correction value calculation process that calculates a correction value, a vehicle line reflection process when the vehicle including the component of which temperature is estimated is a temperature-estimated vehicle that is in a line of vehicles in order to reflect, on the correction value, a tendency of the component to be less cooled when the temperature-estimated vehicle is a trailing vehicle than when the temperature-estimated vehicle is a leading vehicle, a rearmost reflection process when the temperature-estimated vehicle is in the line of vehicles in order to reflect, on the correction value, a tendency of the component to be more cooled when the temperature-estimated vehicle is a rearmost vehicle, and a component temperature estimation process that corrects the base temperature with the correction value.