Exhaust Aftertreatment Torque Control for Component Aging Limits
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Solution Overview
Problem
Existing exhaust aftertreatment system components in vehicles are prone to premature aging due to varying driving conditions, leading to reduced performance and increased pollutant emissions, which poses challenges in maintaining compliance with stringent emission regulations.
Innovation Solution
A method that predicts the aging state of exhaust aftertreatment system components using an aging model, determines an allowable torque based on the aging state and operating parameters, and issues control commands to adjust torque demands, thereby extending the service life of components and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oversized catalytic converters are installed to maintain performance, then emission compliance is improved, but installation space requirement and weight increase
Solution Approach 1:
The patent applies dynamics by making the torque demand dynamic and adaptive based on real-time aging state monitoring. The control unit continuously adjusts the allowable torque demand according to the predicted aging state, transforming the static torque limit into a dynamic parameter that adapts to component condition, thereby extending service life without requiring oversized components
Solution Approach 2:
The patent implements feedback through the aging model that continuously monitors operating parameters (temperature, torque, speed) and feeds this information back to the control unit. This closed-loop feedback system predicts the aging state and adjusts the allowable torque demand accordingly, maintaining emission compliance while optimizing component utilization and extending service life
2Power
If torque demand is increased to meet driver requirements, then vehicle performance is improved, but component aging accelerates
Solution Approach 1:
The patent makes the torque demand dynamic by continuously adjusting the allowable torque based on the predicted aging state. When the aging state is low (component healthy), higher torque demands are permitted for better performance. When aging increases, the allowable torque is reduced to protect the component, creating a dynamic balance between performance and service life extension
Solution Approach 2:
The patent changes the parameter of torque demand based on the aging state. The control unit modifies the torque parameter dynamically according to predictions from the aging model, adjusting operational parameters to optimize the trade-off between vehicle performance and component durability, thereby extending service life without permanently reducing performance capability
3Reliability
If preventive component replacement is implemented to ensure compliance, then emission reliability is improved, but productivity and mileage are reduced
Solution Approach 1:
The patent applies preliminary action by using the aging model to predict future aging states and potential compliance issues before they occur. The system proactively adjusts torque demands and alerts the driver to behavioral changes needed to prevent premature component failure, enabling preventive maintenance based on actual condition rather than fixed schedules, thereby extending usable mileage
Solution Approach 2:
The system implements self-service by continuously monitoring its own component health status through the aging model and automatically adjusting operational parameters (torque demand) to extend component life. The driver is empowered with information about their driving behavior's impact on component aging, enabling them to self-regulate to maximize service life and reduce premature replacements
Data Source
AI summary
A method for influencing an aging process of a component of an exhaust aftertreatment system for a vehicle. An aging state of the component is predictively determined using an aging model. A characteristic value is determined from operating parameters from previous torque demands. An allowable torque is determined, taking into account the aging state of the component and the characteristic value at which a limit value of a compliant aging condition of the component is undershot. A current torque demand is compared with the allowable torque. A signal is issued if the current torque demand exceeds the allowable torque. A control command of a motor control unit is triggered. The control command being selected in the case of a deviation of the exceedance of the current torque demand from the allowable torque.