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G1169 Pages: 2

PART (^
Answer any two full questions, each carries 10 marks.
Explain the four-quadrant chopper control of de motor.

Describe the terms State-of-Charge and Depth-of-Discharge as applied to
batteries.
What is meant by Peukert capacity of a battery? What is its significance?
What is the advantage of AC motor over DC motors for EV applications?
Explain the configuration of v/f controlled induction motor drive with field-
weakening mode and constant-torque mode.
Explain the working principle of a fuel-cell.
PART D
Answer any two full questions, each carries 10 marks.

A hybrid electric vehicle has two sources- an ICE with output power of 80kW
and battery storage. The battery storage is a 150 Ah, Cio battery at 120V. (1.
Calculate the battery energy capacity (ii). Without de-rating the Ahr capacity,
what is the maximum power that can be supported by the battery. (iii). What is
the electrical motor power output if the total efficiency of power converter and
motor combination is 98%. (iv). What is the maximum power that can be
transmitted to the wheels if the transmission efficiency is 95%?

What are the advantages of fuzzy logic based energy management control
strategy in hybrid vehicles?

Draw the block diagram of a general Fuzzy Logic Controller (FLC) and show
the core components of the FLC and the inputs and outputs relevant to a hybrid
electric vehicle control.

What is meant by Constant Power Speed Ratio as applied to an electric motor?
What is its typical value for Induction Motors used in HEV applications?
Explain fuzzy logic implementation of energy management system in a parallel
HEV with induction motor and ICE with an objective of reduction in
environmental pollution with the help of a block diagram.

Draw the typical torque Vs speed envelope curves of drivetrain motors and show
the continuous, intermittent and peak overload ratings.

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