EGR Pump Control via Roots Device and Electric Motor
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Solution Overview
Problem
Existing automotive systems that utilize internal combustion engines face challenges in efficiently recirculating exhaust gases, leading to suboptimal fuel economy and increased emissions.
Innovation Solution
A method of operating an exhaust gas recirculation (EGR) pump using an electric motor coupled to a roots device, with a system controller and EGR control unit to manage motor speed, torque, and temperature, ensuring precise control of EGR mass flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a separate EGR pump is used, then fuel economy is improved, but device complexity increases due to additional components
Solution Approach 1:
The EGR pump is integrated with the turbocharger assembly, combining two separate functions (EGR pumping and air charging) into a single unified device. This integration reduces the overall number of discrete components while maintaining the fuel economy benefits of a dedicated EGR pump.
Solution Approach 2:
The EGR pump assembly serves multiple functions: it acts as both an EGR pump for recirculating exhaust gases and as part of the air charging system through its integration with the turbocharger. This multi-functionality allows a single device to perform what would traditionally require multiple separate components.
2Power
If a separate EGR pump is used, then engine pumping work is reduced, but manufacturing cost increases
Solution Approach 1:
By integrating the EGR pump with the turbocharger, the patent creates a combined assembly that can be manufactured and installed as a single unit. This approach reduces engine pumping work while potentially lowering manufacturing costs compared to installing completely separate EGR pump and turbocharger systems.
Solution Approach 2:
The integrated EGR pump assembly acts as an intermediary between the exhaust system and the intake system, enabling efficient exhaust gas recirculation while utilizing the existing turbocharger infrastructure. This intermediary approach reduces the need for additional high-cost components.
3Object-generated harmful factors
If full authority control of EGR flow rate is implemented, then emissions are reduced, but control system complexity increases
Solution Approach 1:
The control system incorporates feedback mechanisms that monitor EGR flow rate and adjust the pump operation accordingly. This feedback control enables precise regulation of EGR flow to optimize emissions reduction while managing control system complexity through intelligent algorithms.
Solution Approach 2:
The EGR pump system employs dynamic control capabilities that allow real-time adjustment of EGR flow rate based on operating conditions. This dynamic responsiveness enables full authority control for emissions optimization while using adaptive control strategies to manage system 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 solution enhances fuel economy, reduces engine pumping work, and provides full authority control of EGR flow rate, thereby improving engine efficiency and reducing emissions.
Implementation Method 1
an electric motor coupled to a roots device having rotors
Implementation Method 2
a roots device having rotors
Data Source
AI summary
A method of operating an exhaust gas recirculation (EGR) pump for an internal combustion engine including: providing an EGR pump assembly including an electric motor coupled to a roots device having rotors, the EGR pump assembly operably connected to the internal combustion engine; providing a system controller; providing an EGR control unit linked to the EGR pump assembly; sending a speed command from the system controller to the EGR control unit; determining if a motor temperature and a module temperature are within a predetermined target; outputting a desired speed signal; determining if a motor speed is within a predetermined target; determining if a motor voltage is within a predetermined target; and outputting a current to the electric motor controlling the speed of the electric motor and regulating an EGR mass flow rate.