Exhaust Purification Controller Transitional State Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas purification controllers face challenges in maintaining accurate bed temperature control of exhaust gas purification catalysts, particularly during transitional states of exhaust gas flow, leading to decreased calculation accuracy and ineffective bed temperature regulation.
Innovation Solution
An exhaust gas purification controller with a transitional state detection unit that restricts learning when a transitional state is detected, using a control unit to learn and reflect fuel supply amounts for correcting temperature differences between the catalyst bed and target temperature, thereby ensuring appropriate bed temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If learned values are calculated and used for bed temperature control, then temperature control accuracy is improved, but calculation accuracy deteriorates during transitional states of exhaust gas flow
Solution Approach 1:
The system dynamically adjusts the learning process by detecting transitional states of exhaust gas flow and temporarily suspending learned value calculations during these states. This prevents inaccurate calculations during unstable conditions while maintaining continuous temperature control, resolving the contradiction between improving control accuracy and maintaining reliability during transitions.
2Stability of the object's composition
If fuel addition is increased to maintain bed temperature during transitional states, then temperature stability is improved, but fuel consumption increases
Solution Approach 1:
The system uses feedback from the transitional state detection unit to modulate fuel addition rates. During detected transitional states, the control unit adjusts fuel addition based on real-time temperature deviations rather than relying on pre-calculated learned values, maintaining temperature stability while optimizing fuel consumption by avoiding excessive fuel addition.
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 prevents erroneous learning and maintains accurate bed temperature control by detecting transitional states in exhaust gas flow, ensuring the learned values are appropriate and preventing excessive or inadequate fuel addition, thus maintaining stable temperature regulation.
Implementation Method 1
controlling the bed temperature of an exhaust gas purification catalyst arranged in an exhaust system of an internal combustion engine by supplying fuel to the internal combustion engine
Implementation Method 2
a transitional state detection unit that detects a transitional state of an exhaust gas flow to the exhaust gas purification catalyst
Implementation Method 3
when the exhaust gas temperature and exhaust gas flow amount vary greatly, that is, when the exhaust gas temperature and exhaust gas flow amount are in a transitional state
Data Source
AI summary
An exhaust gas purification controller for controlling bed temperature of a DPF, which is arranged in an exhaust system of an internal combustion engine, at a target bed temperature by supplying fuel to the internal combustion engine. The exhaust gas purification controller includes a control unit and a transitional state detection unit. The control unit, when controlling the bed temperature of the exhaust gas purification catalyst, learns a supply amount of fuel that allows for correction of a difference between the catalyst bed temperature and the target bed temperature in the present state and reflects a learned value obtained through the learning on the supply amount of fuel. The transitional state detection unit detects a transitional state of an exhaust gas flow to the DPF. The control unit restricts the learning when the transitional state of the exhaust gas flow is detected.