Miller Cycle Air Handling With Electric Turbo Boost Control
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Solution Overview
Problem
Existing engine control systems for Miller cycle combustion engines face challenges in managing transient operations and emissions, particularly during rapid changes in load or power demand, leading to inefficiencies and increased emissions.
Innovation Solution
A multi-stage turbocharger system with an electric turbo motor and an electronic control system that dynamically adjusts intake flow pressure based on engine parameters, such as engine speed, turbo speed, and air-fuel ratio, to enhance performance during transient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multi-stage turbocharger system with electric turbo motor is implemented, then engine response during transient events is improved, but device complexity increases
Solution Approach 1:
The turbocharger system is divided into multiple stages with independent compressors and turbines. Each stage can be controlled independently through electronic actuators, allowing the system to provide rapid compression boosts during transient events while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The system employs variable geometry turbines and electronically controlled compressor outlets that can dynamically adjust their opening angles based on real-time engine conditions. This dynamic adjustment enables the turbocharger to optimize performance across different operating points, particularly during transient transitions, while the electronic control system manages the added complexity.
2Object-generated harmful factors
If dynamic adjustment of intake flow pressure is implemented, then emissions during transient operation are reduced, but control system complexity increases
Solution Approach 1:
The electronic control system continuously monitors engine parameters including intake manifold pressure, exhaust gas oxygen concentration, and turbocharger speeds. Based on this feedback, the system dynamically adjusts the opening angles of compressor outlets and turbine inlet vanes to optimize air-fuel ratio and combustion efficiency during transient events, thereby reducing emissions. The feedback mechanism allows the complex control system to adapt automatically to changing conditions.
Solution Approach 2:
The system changes key operating parameters such as intake air pressure, turbocharger boost level, and compressor outlet opening angles in real-time based on detected transient conditions. By dynamically adjusting these parameters, the system maintains optimal combustion conditions during transient operation, reducing emissions while the electronic control manages the complexity of coordinating multiple parameter changes.
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
Improves engine response and reduces emissions by providing rapid compression boosts during transient events, ensuring efficient operation and compliance with emissions standards.
Implementation Method 1
A multi-stage turbocharger system with an electric turbo motor and an electronic control system that dynamically adjusts intake flow pressure based on engine parameters
Implementation Method 2
A multi-stage turbocharger system with an electric turbo motor and an electronic control system that dynamically adjusts intake flow pressure
Data Source
AI summary
A system includes an internal combustion engine including a valve train comprising one or more intake valves operable in a Miller cycle and one or more exhaust valves. An electric turbo motor is electronically controllable to boost an output from a lower pressure turbocharger to a higher pressure turbocharger. An electronic control system configured to control the electric turbo motor in response to a transient condition to boost intake flow pressure to the internal combustion engine during the transient condition.