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Development of Transient Model of Fuel Consumption to Optimize IVT

Ebadi, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45132 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saadat Foumani, Mahmoud; Kazemzade Hannani, Siamak
  7. Abstract:
  8. Changes in the internal structure of engines for reducing fuel consumption has almost stopped. While changes in powertrain is a better way to reduce vehicle fuel consumption. Recently, infinitely variable transmissions or IVTs have attracted large attention of car manufacturers . In these systems, due to the continuous transmission ratio, engine speed is kept in a range which is the optimum fuel consumption speed range. Designing of these systems for each vehicle must be done according to the requirements of the vehicle and engine abilities. So, an exact model of engine fuel consumption for the design of these systems is required. One way of improving the accuracy of conventional models, is considering the effects of the rate of change of engine speed and torque on the fuel consumption. In this research, a series of experiments were done to obtain the quasi-steady model and engine's injection system behavior. Then several experiments was designed to observe the effect of the rate of change of engine torque and speed on fuel consumption. To measure the fuel consumption of the engine in short periods of time during transient operations, a method was designed. Relying on these experiments, transient fuel consumption model was developed for the engine. Then an arrangement of IVT consisting of four fixed ratio mechanisms was selected. The ratio of IVT members was optimized using quasi-steady model and then using transient model.This optimization was done at FTP driving cycle using PSO algorithm. Finally, the results of two optimizations were compared. It was found that quasi-steady model exerts large amount of error in calculation. Also the mechanism optimized based on transient model was appropriate than the other mechanism
  9. Keywords:
  10. Particles Swarm Optimization (PSO) ; Federal Lest Procedure (FTP)Driving Cycle ; Infinitely Variable Transmission (IVT) ; Transient Fuel Consumption Model ; Quasi-Steady Fuel Consumption Model

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