Gear Selection for Dual Electrified Axles with Multiple Electric Machines
| dc.contributor.author | Satish, Shamith | |
| dc.contributor.author | Alexsson, Emil | |
| dc.contributor.department | Chalmers tekniska högskola / Institutionen för elektroteknik | sv |
| dc.contributor.examiner | Fredriksson, Jonas | |
| dc.contributor.supervisor | Magnusson, Andreas | |
| dc.date.accessioned | 2024-06-25T07:06:59Z | |
| dc.date.available | 2024-06-25T07:06:59Z | |
| dc.date.issued | 2024 | |
| dc.date.submitted | ||
| dc.description.abstract | Abstract The electrification of heavy-duty trucks has been at the forefront of efforts to achieve sustainability in transportation by replacing conventional internal combustion engine propulsion systems. With advancements in electric propulsion technology, the concept of electrified axles has emerged as a way to build more efficient propulsion systems. This propulsion system configuration is the focus of this thesis, which specifically examines dual electrified axles with multiple electric machines. The aim of this thesis is to design a methodology for gear selection and to formulate a control strategy for the gear selection process. The project utilizes Volvo’s simulation environment in MATLAB and Simulink to construct the gear selection system. Each eclectic axle consists of two electric machines and two two-speed gearboxes. The foundation of the gear selection control strategy is based on the efficiency maps of the electric machines and the gearboxes. Using these maps and the combinations of gear ratios (states) from the two-speed transmission for each motor, a wheel torque versus vehicle speed map was generated to facilitate map-based gear selection, referred to as the state selection map. To implement this map-based gear selection, a control methodology was developed in Simulink, ensuring an optimized number of gearshifts and the efficiency of each electrified axle. The benefit of engaging different usage of the two axles is also evaluated using two different control strategies: independent and parallel. The parallel control strategy lacks the capability to independently assign different states to the two axles, which is used for comparison with the independent control strategy that can send distinct signals to each axle. Each strategy is tested under different operating conditions including city driving, EU highway driving, and US highway driving. The results show that the efficiency of the electrified axle for the independent and parallel control strategies is similar. The independent strategy enables up to 1.79% higher efficiency in every driving condition, except for when the truck is fully loaded to 64000 kg and is operating in city traffic. In that case, it was found that the parallel control strategy achieved 1.09% higher efficiency. | |
| dc.identifier.coursecode | EENX30 | |
| dc.identifier.uri | http://hdl.handle.net/20.500.12380/308023 | |
| dc.language.iso | eng | |
| dc.setspec.uppsok | Technology | |
| dc.subject | Keywords: Gear Selection, Dual Electrified Axles, Heavy Duty Vehicle, Truck Propulsion System | |
| dc.title | Gear Selection for Dual Electrified Axles with Multiple Electric Machines | |
| dc.type.degree | Examensarbete för masterexamen | sv |
| dc.type.degree | Master's Thesis | en |
| dc.type.uppsok | H | |
| local.programme | Mobility engineering (MPMOB), MSc |