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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 40448 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Saadat Foumani, Mahmoud
- Abstract:
- The present research aims at designing a hybrid powertrain for the urban utility vehicles whose internal combustion engines consume more fuel due to idling during most of the time of their mission in the cities. This design has considered development of a hybrid powertrain with the least changes in the vehicle together with a simultaneous lower cost. At first some experiments were conducted to examine the feasibility of using the hybrid powertrain for the urban utility vehicles. One of the results of this test was the speed of these vehicles in different times of working and we can achieved a standard drive cycle though separate methods by analyzing this result. The drive cycle is one of the major inputs of the modeling section. The hybrid vehicles have various architectures. All possible architectures were modeled in consideration of the design aspects by using GT Drive software in order to identify a proper architecture for the urban utility vehicle. In this modeling procedure the effect of engine downsizing was also investigated The results of the simulation and considerations of the subject matter of the project led to selection of a hybrid system called SPA with the use of vehicle original engine. In the next stage the components of this architecture were carefully sized so that a suitable control strategy could be designed for it. Meanwhile, concurrently with the process of designing the selected architecture, another architecture called HSG, a subsidiary of the selected architecture with more concentration on absorption of the braking energy, was also attended. As for the section of designing the control strategy a general optimizing method was used and the results of this optimization were applied to the vehicle’s model with different intelligent and unintelligent methods so that the effect of each one of these methods on reducing fuel consumption could be determined. Consequently, one of the methods of applying the strategy proved to be more successful for each drive cycle however the fuzzy control strategy was more flexible and could result in a proper reduction in fuel consumption in the driving cycles with different speeds. The research finally discusses the detailed design of two powertrain in order to facilitate the manufacture of the prototype.
- Keywords:
- Feasibility Study ; Modeling ; Control Strategy ; Drive Cycle ; Component Sizing
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