TAILIEUCHUNG - Lightweight Electric Hybrid Vehicle Design Episode 10

Tham khảo tài liệu 'lightweight electric hybrid vehicle design episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hybrid vehicle design 153 The Rover Group have been involved in the TETLEI Euro-taxi project and K. Lillie with Warwick University co-workers6 have also gone into print on the gas turbine series hybrid concept. The taxi will be based on the latest Range Rover and the series hybrid mode allows the gas turbine to be decoupled from the wheels so as to operate at its optimum speed and load and avoid the classic limitation of this type of power unit poor fuel economy at light loads poor dynamic response and a high rotational speed required over 60 000 rpm. A sophisticated control system is required to run the turbine in on-off mode according to power demand. One of the vehicle schematics under consideration is seen at d which will be computer modelled to assess its effectiveness. The researchers argue that the development of a valid simulation requires that a number of factors are fully considered. As all of the data stems from an initial calculation of the battery current it is important that this value is accurate. Small variations in the internal resistance of the battery can cause large variations in the rail voltage square of variation . It is important to have an accurate model of the battery which considers both the variation of internal resistance and open-circuit voltage of the battery at different states of charge. Modelling the drive cycle at the two extremes of battery operation 80 and 20 discharge gives a good indication of the range of values over which the voltage and currents in the system may vary for specification purposes. The next step is to introduce a more realistic battery model and practical limits on the power sourced from regenerative braking. During electrical regenerative braking there is a practical upper limit to the voltage permitted across a battery in order to avoid gassing . This restriction may be overcome by the use of an additional form of power sink if the alternator is to continue operating at a fixed load point. DUAL HYBRID

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