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Generator voltage stabilisation for series-hybrid electric vehicles
P Stewart1, D Gladwin, J Stewart
1Department of Electronic and Electrical Engineering, University of Sheffield, Mappin St. Sheffield, UK. p.stewart@shef.ac.uk
ISA Transactions
|February 12, 2008
Summary
This study introduces a novel controller for internal combustion engine speed control in series-hybrid electric vehicles. The model-based controller ensures stable DC link voltage, optimizing engine operation and reducing system costs.
Area of Science:
- Automotive Engineering
- Control Systems
- Hybrid Electric Vehicles
Background:
- Series-hybrid electric vehicles (SHEVs) require precise control of internal combustion engines (ICEs) for optimal performance and efficiency.
- Maintaining a stable DC link voltage is crucial for the reliable operation of traction motors and power electronics in SHEVs.
- Challenges in SHEV control include system time delays and nonlinearities, complicating closed-loop control design.
Purpose of the Study:
- To develop and validate a model-based controller for ICE speed regulation in SHEV applications.
- To ensure the stability of the rectified DC link voltage under dynamic load conditions.
- To optimize ICE operation at its peak efficiency point while supplying a stable voltage to the traction inverters.
Main Methods:
- A four-cylinder, normally aspirated gasoline ICE coupled to a permanent magnet AC generator forms the power source.
- AC voltage is rectified to supply a lead-acid battery and permanent magnet traction motors via inverters.
- An electronically operated throttle enables closed-loop ICE speed control, with a model-based controller designed to address system nonlinearities and time delays.
Main Results:
- The designed model-based controller effectively manages ICE speed, maintaining engine operation at its optimal point.
- The controller ensures a stable 42 V DC link supply to the traction drive inverters, even under load disturbances.
- Transient energy storage requirements at the DC link are minimized, leading to reduced weight and cost.
Conclusions:
- The developed model-based controller is effective for ICE speed control in SHEVs, ensuring stable DC link voltage.
- This approach enhances the overall operational efficiency and reduces the physical footprint of hybrid electric powertrains.
- The controller design successfully mitigates challenges posed by system time delays and nonlinearities, paving the way for improved SHEV performance.
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