Three-Way Catalyst O2 Purge Control for Fuel Economy
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Solution Overview
Problem
The existing three-way catalytic control systems for gasoline engines increase fuel consumption due to inefficient O2 closed-loop control, which fails to reflect the optimal performance characteristics of new three-way catalysts, leading to reduced fuel economy and difficulty in meeting environmental regulations.
Innovation Solution
A three-way catalytic control method that distinguishes between new and deteriorated three-way catalysts by adjusting the O2 purge control time periods based on the oxygen storage capacity, using a predetermined initial value for new catalysts and an extended time period for deteriorated catalysts, thereby optimizing the O2 closed-loop control to reduce fuel consumption and improve fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the O2 closed-loop control time period is extended to remove oxygen from OSC in new three-way catalysts, then the oxygen storage capacity is improved, but fuel consumption increases and fuel economy deteriorates
Solution Approach 1:
The control system dynamically adjusts the O2 closed-loop control time period based on the actual oxygen storage capacity of the three-way catalyst. For new catalysts with high OSC, the control time is shortened since less oxygen removal is needed. For deteriorated catalysts with lower OSC, the control time is extended to ensure sufficient oxygen removal. This dynamic adaptation resolves the contradiction by matching control duration to actual catalyst state rather than using a fixed extended time period.
Solution Approach 2:
The invention changes the control parameter (O2 closed-loop control time period) based on catalyst age and oxygen storage capacity characteristics. By adjusting this parameter according to whether the catalyst is new or deteriorated, the system optimizes the balance between oxygen removal effectiveness and fuel consumption, avoiding the waste associated with uniformly extended control times.
2Reliability
If the O2 closed-loop control time period is increased to ensure sufficient oxygen removal in deteriorated catalysts, then the purification performance is improved, but fuel economy deteriorates
Solution Approach 1:
The control system dynamically determines the appropriate O2 closed-loop control time period based on real-time detection of oxygen storage capacity. For deteriorated catalysts, the system extends the control time only when necessary to achieve sufficient oxygen removal and maintain purification performance, rather than always using maximum control duration. This dynamic adjustment maintains purification effectiveness while minimizing fuel consumption penalties.
3Ease of operation
If a uniform O2 closed-loop control time period is applied to all catalyst conditions, then the control system is simple to operate, but it fails to reflect optimal performance characteristics of new catalysts
Solution Approach 1:
The control system automatically detects the oxygen storage capacity of the three-way catalyst and self-adjusts the O2 closed-loop control time period accordingly. The system uses oxygen sensor signals to determine catalyst state and autonomously selects appropriate control durations, eliminating the need for manual intervention while achieving optimal performance for both new and deteriorated catalysts.
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 enhances the efficiency of O2 closed-loop control, maintains catalyst performance, reduces fuel consumption, and helps vehicles meet environmental regulations by optimizing the O2 purge control time periods, thereby improving fuel economy and compliance with environmental standards.
Implementation Method 1
oxidation of CO and HC
Implementation Method 2
reduction of NOx
Implementation Method 3
oxygen storage capacity material (hereinafter, the "OSC")
Data Source
AI summary
A three-way catalytic control method for reducing fuel consumption is provided. The method includes determining whether oxygen storage capacity of the three-way catalyst is under condition of increasing oxygen, when condition of performing O2 purge control for the three-way catalyst is detected and performing O2 purge control by applying a predetermined O2 purge time period to which a set initial value of oxygen of OSC is applied, when the OSC is not under the condition of increasing oxygen. The O2 purge control is performed by applying O2 purge time period for a deteriorated product based on an oxygen sensor or O2 purge time period for on board diagnosis, when an increase amount of the calculated O2 purge time period is equal to or greater than the O2 purge time period for the deteriorated product during the O2 purge control.