Adaptive Exhaust Temperature Control via Dynamic Fuel Injection
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Solution Overview
Problem
Existing engine exhaust system temperature control methods fail to effectively manage dynamic conditions such as changing engine speed and torque, leading to inadequate control performance during regeneration of particulate filters.
Innovation Solution
An adaptive control model is implemented in the engine exhaust system, using a fuel injector to calculate and adjust the fuel injection flow rate based on monitored conditions, incorporating a proportional-integral controller and an adaptive process model to dynamically adjust the control strategy and reduce errors, ensuring accurate temperature control between the catalytic converter and particulate filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a known temperature control system is used, then steady-state temperature control is adequate, but control performance under dynamic conditions deteriorates
Solution Approach 1:
The control system transitions from a static known control system to a dynamic adaptive control model that continuously updates its parameters based on real-time exhaust system conditions. The adaptive control model adjusts fuel injection rates dynamically in response to changing engine speed and torque, maintaining effective temperature control under varying operational conditions.
Solution Approach 2:
The system implements feedback by monitoring the actual exhaust stream temperature and comparing it with the target temperature. This feedback loop allows the adaptive control model to calculate errors and adjust the fuel injection rate accordingly, improving control performance under both steady-state and dynamic conditions.
2Productivity
If fuel injection rate is increased to raise exhaust temperature, then regeneration efficiency improves, but risk of overheating increases
Solution Approach 1:
The adaptive control model continuously monitors the exhaust stream temperature and uses this feedback to adjust the fuel injection rate. When the temperature approaches the target regeneration temperature, the model reduces fuel injection to prevent overheating, thereby maintaining regeneration efficiency while eliminating the overheating risk.
Solution Approach 2:
The system dynamically changes the fuel injection rate parameter based on real-time temperature measurements and adaptive model calculations. This parameter adjustment allows precise control of the exhaust temperature, ensuring it reaches the regeneration threshold without exceeding safe operational limits.
3Measurement precision
If adaptive control model is continuously updated, then control accuracy improves, but computational complexity increases
Solution Approach 1:
The adaptive control model updates only the necessary parameters required for temperature control rather than performing complete system re-characterization. This partial action approach maintains control accuracy by focusing computational resources on the most critical model parameters while reducing overall computational complexity.
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 provides robust temperature control under dynamic conditions, ensuring efficient regeneration of the particulate filter without overheating, thereby extending its lifespan and maintaining filtration efficiency.
Implementation Method 1
A fuel injector for injecting fuel into an exhaust stream at a location upstream from the outlet of the particulate filter
Implementation Method 2
The exhaust system includes an oxidation catalyst
Data Source
AI summary
Systems and methods are provided for controlling an exhaust stream temperature at a point along an exhaust system. The exhaust system can include an oxidation catalyst, a particulate filter having an outlet, and a fuel injector for injecting fuel into an exhaust stream at a location upstream from the outlet. An adaptive control can be provided to model a portion of the exhaust system. A fuel injection flow rate at which fuel is injected into the exhaust stream by the fuel injector can be calculated based on the adaptive control model. An operation of the fuel injector can be controlled based on the calculated fuel injection flow rate, to control the exhaust stream temperature at point along the exhaust system. A condition of the exhaust stream can also monitored and an error in the adaptive control model can be determined based on the monitored condition. The adaptive control model can also be changed to reduce the error.