Catalyst Heating Control Using Oxygen Storage Capacity
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Solution Overview
Problem
Current catalyst heating control methods do not differentiate between fresh and aging catalysts, leading to decreased exhaust gas purification efficiency and deteriorated fuel efficiency due to uniform heating periods regardless of catalyst age.
Innovation Solution
A method using lambda sensors to determine exhaust gas temperature and oxygen storage capacity, allowing for differentiated catalyst heating periods based on the aging level of the catalyst, thereby optimizing catalyst activation temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same catalyst heating control condition is used for both fresh and aging catalysts, then the control system is simple to operate, but the exhaust gas purification efficiency decreases and fuel efficiency deteriorates
Solution Approach 1:
The catalyst heating control system dynamically adjusts the heating period duration based on the detected aging level of the catalyst. The ECU modifies the heating control strategy in real-time according to catalyst condition, transitioning from a static fixed-duration approach to a dynamic adaptive approach that optimizes purification efficiency while maintaining ease of operation.
Solution Approach 2:
The system changes the heating period parameter based on catalyst aging level detection. By measuring oxygen storage capacity and comparing it against reference values, the system adjusts the heating duration parameter to match the actual catalyst condition, thereby improving purification efficiency without complicating the overall control operation.
2Ease of operation
If the same catalyst heating control condition is used for both fresh and aging catalysts, then the control system is simple to operate, but fuel efficiency deteriorates
Solution Approach 1:
The heating control duration is dynamically adjusted based on catalyst aging level. For aging catalysts with reduced oxygen storage capacity, the system extends the heating period to ensure proper activation, optimizing fuel consumption rather than using a fixed duration that would be inefficient for aged catalysts.
Solution Approach 2:
The control system modifies the heating period parameter according to the detected catalyst aging level. This parameter adaptation ensures that fuel is consumed efficiently by providing appropriate heating duration matched to the actual catalyst condition, preventing both under-heating and excessive heating.
3Reliability
If catalyst heating period is extended to ensure activation, then catalyst activation is achieved, but fuel efficiency deteriorates
Solution Approach 1:
The system uses feedback from oxygen storage capacity measurements to determine the appropriate heating period duration. By continuously monitoring catalyst condition and adjusting heating time accordingly, the system achieves reliable catalyst activation while minimizing unnecessary fuel consumption from excessive heating.
Solution Approach 2:
The heating period parameter is dynamically changed based on real-time detection of catalyst aging level. This adaptive parameter adjustment ensures the minimum necessary heating time is applied for reliable activation without extending heating beyond what is needed, thereby maintaining fuel efficiency.
4Use of energy by moving object
If catalyst heating period is shortened to improve fuel efficiency, then fuel efficiency improves, but catalyst activation may be insufficient
Solution Approach 1:
The system employs feedback control by measuring oxygen storage capacity to determine when catalyst activation is sufficient. This allows the heating period to be shortened only when activation is achieved, preventing both insufficient heating and excessive heating, thereby maintaining both fuel efficiency and reliable activation.
Solution Approach 2:
The heating period parameter is adaptively changed based on detected catalyst response during heating. The system monitors oxygen storage capacity changes and adjusts the heating duration parameter to match the actual activation progress, ensuring sufficient activation with minimal fuel consumption.
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 improves fuel efficiency by ensuring appropriate catalyst heating times based on catalyst aging, enhancing exhaust gas purification and preventing engine and catalyst damage.
Implementation Method 1
determining a temperature of exhaust gas
Implementation Method 2
determining an oxygen storage capacity of a catalyst depending on the determined temperature of the exhaust gas
Implementation Method 3
A catalyst performing an oxidation-reduction reaction to the exhaust gas is embedded in the catalyst converter
Implementation Method 4
a catalyst performing an oxidation-reduction reaction to the exhaust gas is embedded in the catalyst converter
Implementation Method 5
catalyst heating control for shortening a light-off temperature (LOT) arrival time of the catalyst
Data Source
AI summary
A method for catalyst heating control for controlling a catalyst heating period of a catalyst heating system in which lambda sensors are each mounted at upstream and downstream sides of a catalyst converter may include determining a temperature of exhaust gas after an engine starts; determining an oxygen storage capacity of a catalyst depending on the determined temperature of the exhaust gas; comparing the determined oxygen storage capacity with a reference value to decide an aging level of the catalyst; and determining times of the catalyst heating period to be different from each other depending on the decided aging level of the catalyst.