چكيده به لاتين
In this master thesis, a new system is designed to supply engine accessory loads during driving in urban drive cycles. First, we simulated the conventional bus model in GT-SUITE software which is compeletly adapted from ADVISOR software. In order to validate the simulated model, comparing the results in both software and examining the acceleration and gradeability performance of vehice have been done. After verifying the result of conventional bus model, in the absence of engine accessory loads, and with engine accessory loads, new auxiliary power unit is applied to the bus base model. The auxiliary power unit consists of an electric motor, a flywheel, a battery and clutches. In order to proper design of new auxiliary power unit, the components of the system were sized appropriately according to the defined criteria. The auxiliary power unit operates by rule base control system, which is designed according to the criteria for each component. In order to evaluate the effectiveness of the use of new auxiliary power unit to supply the internal combustion engine accessory loads, fuel economy tests have been performed in three standard driving cycles. The results of the tests illustare how each component in auxiliary power unit works and also represent the changes in SOC, battery power, flywheel power and electric motor power. As a result, the amount of fuel consumption has been calculated and improvement of fuel economy is seen through the conclusion.
