Exhaust Catalyst HC Deposition Estimation Using Coolant Temperature
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Solution Overview
Problem
Existing hydrocarbon deposition estimation methods in internal combustion engines are inaccurate due to reliance on limited temperature parameters, leading to varying estimation errors based on engine warmth and requiring complex parameter selection.
Innovation Solution
A hydrocarbon deposition estimation device and method utilizing intake air temperature, cooling liquid temperature, and exhaust gas flow rate measurements to accurately estimate hydrocarbon deposition in exhaust gas purification devices, with control mechanisms for temperature rise to manage deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only ambient temperature is used as a temperature parameter for HC increase amount calculation, then the calculation method is simple, but the estimation accuracy deteriorates when engine temperature varies
Solution Approach 1:
The patent changes the temperature parameter from ambient temperature to engine temperature (cooling liquid temperature), which directly reflects the actual thermal state of the engine. This parameter change resolves the contradiction by providing accurate estimation across varying engine warmth conditions while maintaining calculation simplicity through direct sensor measurement.
2Measurement precision
If more temperature parameters are added to improve estimation accuracy, then estimation precision improves, but system complexity increases
Solution Approach 1:
The patent uses cooling liquid temperature as an intermediary parameter that indirectly represents the overall thermal state of the engine. This single intermediary parameter captures the effect of multiple temperature sources (intake air, exhaust gas, engine block) without requiring direct measurement of each, thus improving accuracy while avoiding the complexity of multiple parameters.
3Measurement precision
If engine temperature is considered for accurate HC estimation, then estimation accuracy improves, but the calculation requires additional temperature measurements
Solution Approach 1:
The patent leverages the existing cooling liquid temperature sensor that is already part of the engine's normal monitoring system. By using this self-service approach, the patent obtains accurate engine temperature data without adding dedicated measurement devices, thus improving HC estimation accuracy while avoiding additional system complexity.
Data Source
AI summary
This hydrocarbon deposition amount estimation device comprises a hydrocarbon deposition amount estimation unit that estimates the deposition amount of hydrocarbons deposited in an exhaust gas purification device of an internal combustion engine equipped with an oxidation catalyst on the basis of at least a first measured value corresponding to the intake air temperature of the internal combustion engine, a second measured value corresponding to the temperature of a cooling liquid of the internal combustion engine, and a third measured value corresponding to the exhaust gas flow rate of the internal combustion engine.