Fast and Robust Hybrid Starter and Generator Speed Control for Improving Drivability of Parallel Hybrid Electric Vehicles

Speed control algorithms were studied to improve vehicle fuel economy and driving performance by rapidly combining two power sources—the engine and the driving motor. A hybrid starter and generator (HSG) was used in parallel hybrid vehicles, improving vehicle drive system efficiency by eliminating t...

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Bibliographic Details
Published inEnergies (Basel) Vol. 13; no. 19; p. 5055
Main Authors Yang, ByungHoon, Kim, KyoungJoo, Mok, HyungSoo
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2020
Subjects
2-DOF control
Active damping
Algorithms
Controllers
Cranking
Design
Driving ability
Electric vehicles
Energy consumption
Energy efficiency
engine clutch
Friction
Fuel consumption
Fuel economy
hybrid starter and generator
IP control
Load fluctuation
Load resistance
Mathematical models
Methods
PI control
Power sources
Speed control
Torque converters
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Summary:Speed control algorithms were studied to improve vehicle fuel economy and driving performance by rapidly combining two power sources—the engine and the driving motor. A hybrid starter and generator (HSG) was used in parallel hybrid vehicles, improving vehicle drive system efficiency by eliminating torque converters. The proposed zero-overshoot and zero-phase-error speed controller with active damping has the following three characteristics. First, it has an active damping structure resistant to load fluctuations (e.g., cranking torque fluctuation during engine starting). Second, there is no speed overshoot for the step command corresponding to the minimum engine running speed. Finally, it has no steady-state error for the ramp command generated by the moving vehicle. These control features reduce the time required to match the speeds of the two power sources, reducing delay when the vehicle starts and reducing energy consumption by minimizing unnecessary engine rotation. Simulation and vehicle test results proved that the proposed algorithm produced faster response characteristics and smaller steady-state errors than conventional control algorithms such as proportional-integral, integral-proportional, and two-degree-of-freedom algorithms. In this study, the fuel efficiency and driving performance of the hybrid vehicle could be improved by improving the performance of the speed control alone without any additional hardware changes.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13195055