Abstract
The purpose of this article is to describe the design of a limited stroke actuator and the corresponding prototype to drive a Low Pressure (LP) Exhaust Gas Recirculation (EGR) valve for use in Internal Combustion Engines (ICEs). The direct drive actuator topology is an axial flux machine with two air gaps in order to minimize the rotor inertia and a bipolar surface-mounted permanent magnet in order to respect an 80° angular stroke. Firstly, the actuator will be described and optimized under constraints of a 150 ms time response, a 0.363 N·m minimal torque on an angular range from 0° to 80° and prototyping constraints. Secondly, the finite element method (FEM) using the FLUX-3D® software (CEDRAT, Meylan, France) will be used to check the actuator performances with consideration of the nonlinear effect of the iron material. Thirdly, a prototype will be made and characterized to compare its measurement results with the analytical model and the FEM model results. With these electromechanical behavior measurements, a numerical model is created with Simulink® in order to simulate an EGR system with this direct drive actuator under all operating conditions. Last but not least, the energy consumption of this machine will be estimated to evaluate the efficiency of the proposed EGR electromechanical system.
Highlights
IntroductionAs shown in [1] and Figure 1, Mann and Hummel proposed a dual air loop Exhaust Gas Recirculation (EGR) system using an EGR
Additional parts to maintain the magnets on the rotor and to connect the actuator on the additional parts to maintain the magnets on the rotor and to connect the actuator on the Exhaust Gas Recirculation (EGR) system
The EGR position cycle is dynamically simple and has few requirements to maintain a stable position for a long time
Summary
As shown in [1] and Figure 1, Mann and Hummel proposed a dual air loop EGR system using an EGR. Low Pressure (LP) valve and air flow throttle. This system is more adapted to plastic use as opposed to the topology using an exhaust throttle as presented in [2]. The use of an intake valve leads to lesser stress on the DC motor and electronic components. The actuator moves the EGR valve and opens the EGR circuit loop in order to mix exhaust gas with fresh air. When the EGR valve is wide open, as it can be necessary to improve the EGR rate, the actuator closes the fresh air circuit with the air intake flap
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