Engine Warm-Up Control for Emissions Reduction
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Solution Overview
Problem
Existing engine systems face challenges in reducing emissions during engine warm-up and dynamic maneuvers, as aftertreatment system components are not efficient until they reach operating temperatures, and emissions increase during these conditions.
Innovation Solution
A system that includes exhaust gas temperature sensors and a combustion control module to adjust target boost pressure, EGR flow rate, and fuel injection parameters based on engine speed and load, employing different sets of target values to optimize emissions reduction during engine warm-up and dynamic maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine operates during warm-up or dynamic maneuvers, then the engine can be started and perform maneuvers, but emissions increase and aftertreatment components do not operate efficiently
Solution Approach 1:
The control system dynamically adjusts engine operating parameters (boost pressure, EGR flow rate, fuel injection timing and quantity) based on real-time engine conditions during warm-up and dynamic maneuvers. This allows the engine to adapt its operation to minimize emissions while maintaining performance capability, transitioning between different operating modes as conditions change.
Solution Approach 2:
The system changes key operating parameters including boost pressure targets, EGR flow rates, and fuel injection parameters to optimize the balance between engine performance and emissions reduction during warm-up and dynamic maneuvers. These parameter adjustments enable the engine to operate more cleanly while maintaining operational capability.
2Reliability
If aftertreatment components are heated to operating temperature, then emissions reduction efficiency improves, but the warm-up time increases
Solution Approach 1:
The control system performs preliminary actions by adjusting engine operating parameters during the warm-up phase to promote faster heating of aftertreatment components. By optimizing fuel injection and air management before full operational efficiency is reached, the system accelerates the warm-up process and reduces the time required to reach efficient operating temperatures.
Solution Approach 2:
The system rushes through the warm-up phase by using aggressive fuel injection strategies and optimized air-fuel ratios that generate higher exhaust temperatures, thereby quickly bringing aftertreatment components to their light-off temperatures and reducing the duration of the inefficient warm-up period.
3Power
If boost pressure and fuel injection are increased during dynamic maneuvers, then engine power increases, but emissions increase
Solution Approach 1:
The system implements dynamic parameter changes by adjusting fuel injection timing, quantity, and boost pressure targets based on detected dynamic maneuver conditions. During rapid acceleration or high-load events, the control module modifies these parameters to reduce emissions while maintaining necessary power output, using different target values specific to dynamic maneuver scenarios.
Data Source
AI summary
A system includes a temperature sensor configured to measure a temperature of exhaust gas produced by an engine, and a boost error module configured to determine a boost error of the engine. The system further includes a combustion control module configured to select at least one of a target boost pressure of the engine, a target EGR flow rate of the engine, and a target fuel injection parameter of the engine from a first set of target values when the exhaust gas temperature is less than a predetermined temperature and the boost error is less than a predetermined value, and to select the at least one of the target boost pressure, the target EGR flow rate, and the target fuel injection parameter from a second set of target values when the exhaust gas temperature is less than the predetermined temperature and the boost error is greater than the predetermined value.