Turbocharger-Integrated EGR Pump for Dynamic Flow Control
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Solution Overview
Problem
Internal combustion engines face challenges in efficiently managing exhaust gas recirculation (EGR) to optimize fuel efficiency and reduce emissions, as existing systems struggle to dynamically adjust the EGR flow rate and pressure differential based on varying operating conditions.
Innovation Solution
A powertrain system with a pump operatively connected to the intake and exhaust manifolds, capable of selectively controlling a positive EGR flow rate by determining NOx concentration and pressure differential, and adjusting its operation to achieve desired engine efficiency and emission reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a dedicated EGR system is used to recirculate exhaust gas to the intake manifold, then NOx emissions are reduced, but the system complexity increases and the fuel/air mixture ratio must be varied from various operating conditions
Solution Approach 1:
The pump is integrated into the existing turbocharger assembly, serving both as a turbocharger component and an EGR pump. This multi-functional design allows the same device to perform compression and exhaust gas recirculation, reducing overall system complexity while maintaining NOx emission reduction capabilities
Solution Approach 2:
The EGR pump is merged with the turbocharger assembly, combining what were previously separate components. The pump is positioned within the turbocharger housing and shares structural elements, thereby reducing the number of separate components and simplifying the EGR system architecture
2Object-generated harmful factors
If the EGR flow rate is increased to reduce NOx emissions, then NOx concentration decreases, but the fuel efficiency deteriorates due to variations in fuel/air mixture ratio
Solution Approach 1:
The system incorporates sensors that monitor NOx concentration, EGR flow rate, and engine operating conditions in real-time. The control unit receives this feedback and dynamically adjusts the pump operation to optimize the balance between NOx reduction and fuel efficiency, preventing excessive EGR that would harm fuel economy
Solution Approach 2:
The pump operation is made dynamic and adjustable based on real-time engine conditions. The control unit modulates the pump speed and EGR flow rate according to varying operating conditions, allowing the system to maintain optimal performance across different load and speed regimes rather than using a fixed EGR rate
3Reliability
If the pump operates to maintain positive EGR flow rate across varying engine conditions, then emission control is improved, but the device complexity and control requirements increase
Solution Approach 1:
The control unit utilizes existing sensor data from the engine management system to automatically control the pump operation. The system self-regulates based on inputs from already-present sensors monitoring engine parameters, eliminating the need for additional dedicated sensors or complex external control systems
Solution Approach 2:
The existing turbocharger control unit is made multi-functional by adding EGR pump control capabilities. The same control unit that manages turbocharger operation now also controls the EGR pump, reducing the need for separate dedicated control hardware and simplifying the overall control architecture
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
The system effectively reduces NOx emissions and improves fuel efficiency by dynamically managing the EGR flow rate and pressure differential, suppressing combustion temperatures and enhancing catalyst light-off during cold starts.
Implementation Method 1
Internal combustion engines may re-circulate exhaust gas from the exhaust system to an intake manifold, typically referred to as Exhaust Gas Recirculation (EGR), to improve fuel efficiency of the vehicle and/or reduce engine emissions
Implementation Method 2
determining a pressure differential between the exhaust manifold and the intake assembly. A determination is made as to whether a required pressure differential between the exhaust manifold and the intake assembly to provide a desired fuel efficiency
Implementation Method 3
The system effectively reduces NOx emissions and improves fuel efficiency by dynamically managing the EGR flow rate and pressure differential, suppressing combustion temperatures
Data Source
AI summary
A powertrain includes a combustion chamber, an intake assembly, an exhaust manifold, and a pump. The combustion chamber is configured for combusting an air and fuel mixture. The intake assembly is configured to supply air to the combustion chamber. The exhaust manifold is configured to draw exhaust gas from the combustion chamber. The pump is operatively disposed between the intake assembly and the exhaust manifold such that the pump is in fluid communication with each of intake assembly and the exhaust manifold. The pump is configured to operate in a first mode to draw exhaust gas from the exhaust manifold and supply the exhaust gas to the intake manifold at a positive EGR flow rate such that exhaust gas is supplied to the combustion chamber.