Catalyst Warm-Up Control via Dynamic Engine Parameter Adjustment
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Solution Overview
Problem
Existing internal combustion engine systems face challenges in quickly warming up catalysts to optimal operating temperatures, especially during cold starts, leading to prolonged emission of pollutants like NOx and CO, and existing solutions do not effectively adapt to changing ambient conditions.
Innovation Solution
A control system and method that receives sensor information about catalyst temperature and calculates engine performance values based on candidate control points to determine a minimum warm-up rate, controlling the engine to restrict air flow and adjust fuel and exhaust factors to efficiently raise the catalyst temperature, updating control maps dynamically to optimize warm-up strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If engine operation is controlled to warm catalyst faster during cold start, then catalyst light-off temperature is reached quicker, but engine performance and emission control may be compromised
Solution Approach 1:
The control system dynamically adjusts engine operating parameters (intake air flow, fuel injection timing, EGR rate) in real-time during cold start to optimize catalyst warm-up rate while maintaining emission control. The system continuously monitors catalyst temperature and modifies engine control map selections based on ambient conditions and actual warm-up progress, rather than using fixed control strategies.
Solution Approach 2:
The system changes multiple engine operating parameters simultaneously (intake air temperature, pressure, fuel-air ratio, EGR flow) to achieve the desired catalyst warm-up rate. By adjusting these parameters in combination based on the selected control map, the system can control the warm-up rate while maintaining proper emission control through coordinated parameter management.
2Device complexity
If fixed control strategies are used for catalyst warm-up, then control system is simpler, but system cannot adapt to changing ambient conditions
Solution Approach 1:
The control system uses multiple pre-defined control maps that can be dynamically selected based on ambient conditions (temperature, pressure, humidity) and actual catalyst warm-up progress. This allows the system to adapt to varying environmental conditions while using established control strategies from the maps, balancing adaptability with system simplicity.
Solution Approach 2:
The control system employs a universal control map structure that can handle multiple operating conditions and scenarios. Each control map contains comprehensive control strategies that can be applied across different ambient conditions, and the system selects the appropriate map based on current conditions, providing universal adaptability without requiring completely separate control systems for each scenario.
3Adaptability or versatility
If multiple control maps are maintained for different operating conditions, then system adaptability improves, but memory requirements and processing load increase
Solution Approach 1:
The control system divides the operating space into multiple control maps, each optimized for specific ambient conditions and operating ranges. By segmenting the control strategy into discrete maps based on conditions like temperature ranges, pressure levels, and humidity, the system can efficiently store and retrieve appropriate control parameters without needing to maintain a single enormous control table, reducing overall memory requirements through structured organization.
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 allows for precise and adaptive catalyst warm-up, reducing emissions of NOx and CO by ensuring catalysts reach operational temperatures faster, even under varying conditions, thereby improving engine performance and emission control.
Implementation Method 1
Aftertreatment devices, such as oxidation or selective catalytic reduction (SCR) catalysts, reduce the amount of potentially harmful emissions that are produced by internal combustion engines. Oxidation catalysts, for example, catalyze a reaction with NOx that converts NOx to harmless compounds.
Implementation Method 2
it may take five minutes or more for exhaust gas to warm the catalyst to a sufficient operating temperature
Implementation Method 3
exhaust gas to warm the catalyst to a sufficient operating temperature
Data Source
AI summary
A method for controlling an internal combustion engine system including a catalyst includes receiving a desired output for an internal combustion engine, and receiving sensor information including information indicative of a temperature of the catalyst. The method includes calculating a plurality of sets of engine performance values based on respective sets of candidate control points, the engine performance values including a temperature change rate at which the temperature of the catalyst changes over time, and determining whether the temperature change rate satisfies a minimum warmup rate for the catalyst. The method also includes controlling the internal combustion engine based on a selected set of candidate control points and the minimum warmup rate.