Diesel Engine Control System Transient Response
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Solution Overview
Problem
Internal combustion engines face challenges in adapting to transient operating conditions, such as gear changes and deceleration followed by reacceleration, due to the slow response time of existing control systems, leading to ineffective control methods and increased emissions of polluting species.
Innovation Solution
A control system for diesel engines with a partial exhaust gas recirculation circuit that estimates intake air parameter setpoints, corrects them based on exhaust richness and intake richness, and utilizes sensors to adapt to changing conditions, accelerating the response time and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system uses traditional stabilization-based tuning methods, then the control parameters are well-defined in stable operating conditions, but the response time is too slow during transient operating phases
Solution Approach 1:
The control system performs preliminary calculations of air parameter setpoints using maps before transient conditions occur. During transient phases, pre-calculated setpoints are immediately available for correction, eliminating the delay of real-time computation and enabling rapid adaptation to changing operating conditions
Solution Approach 2:
The system continuously monitors actual operating parameters and compares them with setpoints from maps. During transients, the correction means uses feedback from exhaust richness measurements to dynamically adjust air parameter setpoints, enabling the system to adapt in real-time while maintaining control effectiveness
2Loss of time
If the control system adapts quickly to transient conditions, then the response time is reduced, but the complexity of the control system increases
Solution Approach 1:
Complex calculations are performed in advance during stable operation to build lookup maps containing air parameter setpoints. During transients, the system only needs to perform simple corrections based on pre-calculated data, achieving fast response without requiring complex real-time computation hardware
Solution Approach 2:
The correction means acts as an intermediary layer between the traditional control system and the transient conditions. It takes simple inputs (exhaust richness, basic operating parameters) and produces corrected setpoints, isolating the complexity to a dedicated correction module rather than the entire control system
3Ease of manufacture
If the control system maintains simple structure, then the ease of manufacture is high, but the ability to regulate transient operating phases is insufficient
Solution Approach 1:
The control system uses universal lookup maps that can be generated once during calibration and then applied across all operating conditions. The same map structure and correction logic handle both stable and transient conditions, making the system easy to manufacture while providing broad transient regulation capability
Solution Approach 2:
The system uses sensors already present on the vehicle (exhaust richness sensors, temperature sensors) to provide the information needed for transient correction. No additional complex measurement systems are required, maintaining ease of manufacture while enabling adaptive transient control
Data Source
AI summary
The invention relates to a system for controlling a diesel internal combustion engine provided with a circuit for partially recirculating the exhaust gases, including a means (3) for estimating set values of intake-air parameters, characterised in that it includes: a means for estimating the richness of the exhaust gas, a means (6) for determining a set value of the intake richness according to set values of the intake-air parameters, and a means (7) for correcting at least one of the set values of the intake-air parameters according to the estimation of the richness of the exhaust gas and the richness set value.