Fuel Injection Control for Exhaust Catalyst Temperature Management
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in adjusting OTP boost values during OTP and power boosting, leading to potential worsening of fuel economy and exhaust characteristics due to excessive fuel injection corrections.
Innovation Solution
A fuel injection control apparatus and method that estimates the convergence temperature of the exhaust gas catalytic converter, calculates OTP boost values based on this temperature, and adjusts the OTP boost value by considering the temperature decrement caused by power boosting, ensuring appropriate fuel injection corrections are made.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the OTP boost value is increased to prevent overheating of the exhaust gas catalytic converter, then the catalyst temperature is reduced, but fuel economy and exhaust characteristic worsen
Solution Approach 1:
The system estimates the convergence temperature of the exhaust gas catalytic converter and uses this feedback information to dynamically adjust the OTP boost value. The convergence temperature estimation section continuously monitors catalyst temperature trends and feeds this information back to the OTP boost value calculation section, enabling real-time optimization of fuel injection amount to prevent both overheating and excessive cooling
Solution Approach 2:
The system changes the OTP boost value parameter based on the estimated convergence temperature. When the convergence temperature indicates the catalyst is approaching optimal temperature range, the OTP boost value is reduced or canceled, thereby improving fuel economy. When temperature rises toward overheating thresholds, the OTP boost value is increased to cool the catalyst through additional fuel vaporization
2Loss of energy
If the OTP boost value is adjusted based on convergence temperature estimation, then fuel economy is improved, but the system complexity increases due to temperature estimation requirements
Solution Approach 1:
The system replaces complex physical temperature sensors and measurement devices with a computational convergence temperature estimation mechanism. The estimation section uses mathematical models and processing of readily available engine operating parameters (such as intake air temperature, exhaust gas recirculation rate, and fuel injection amount) to calculate convergence temperature, substituting mechanical sensing complexity with software-based estimation
Solution Approach 2:
The convergence temperature estimation section acts as an intermediary that processes multiple existing sensor inputs (intake air temperature, exhaust gas recirculation rate, fuel injection amount) to derive catalyst temperature information without requiring direct catalyst temperature sensing. This intermediary estimation mechanism simplifies the overall system by avoiding direct installation of complex high-temperature sensors in the exhaust system
3Power
If both OTP boosting and power boosting are executed simultaneously, then the fuel injection amount is increased to meet power demands, but the catalyst temperature may drop excessively affecting exhaust characteristics
Solution Approach 1:
The system dynamically adjusts the OTP boost value based on real-time convergence temperature estimation even during power boosting operations. The OTP boost value calculation section continuously monitors the estimated convergence temperature and modulates the fuel injection correction accordingly, creating a dynamic balance between power delivery requirements and catalyst temperature maintenance during transient operating conditions
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
Prevents excessive fuel injection and subsequent worsening of fuel economy and exhaust characteristics by accurately determining OTP boost values, optimizing fuel injection amounts during both OTP and power boosting conditions.
Implementation Method 1
When the fuel injection amount is boosted, exhaust gas temperature decreases by vaporization heat of fuel
Data Source
AI summary
A fuel injection control for an internal combustion engine includes: estimating a convergence temperature of the exhaust gas catalytic converter; calculating an OTP boost value using the estimated convergence temperature; and estimating the convergence temperature on the assumption that the temperature decrement quantity of the exhaust gas catalytic converter which is caused by the power boosting is zero when both of the OTP boosting execution condition and the power boosting execution condition are met.