Lecture 12 - Energy Consumption

Question 1

Charging process at the stations

Answer 1

• Use of rigid conductor rails as stations and stops only
• Use as much energy as possible during the dwell time
• Vehicle control charging itself

Question 2

Draw charge and discharge phases (12.1)

Answer 2

identify

Question 3

Battery electric traction vs Fuel cell electric traction

Answer 3

Battery:
• heavy and bulky, limited life time, reduced efficiency over life time, high CO2 burden before operation
Fuell cell:
Energy density expensive, high pressure or cooling neccesary, availability of hydrogen neccesary, high energy required for hydrogen production

Question 4

Requirements for drive trains with combustion engine

Answer 4

General requirements:
minimum power loss in transmissions to driving wheelsets
interrupting power transmission with stationary vehicle and running engine
converting low engine torque in high wheelset torque
gear shifting withouth interruptions

railway-related requirements
distributing driving force among different wheelsets if neccesary
enabling driving direction change
suitable for railway use, robust, high availability

Question 5

Demand characteristic

Answer 5

The necessary torques and power for driving at constant speed or accelerating

Question 6

Delivery characteristic / map

Answer 6

Traction characteristic delivered by the traction unit to overcome the demand

Question 7

Ideal delivery characteristic

Answer 7

Is the combination of a torque limitation through the wheel-rail adhesion and a maximum permissible rotational speed of the traction unit or maximum speed

Question 8

Maximum possible driving speed / rotational, draw (fig 12.2)

Answer 8

Is the intersection of the demand and delivery characteristics

Question 9

Transmission Types

Answer 9

In the vehicle technology 2 types of transmissions are mainly know:
• Rotational speed converters
• Torque converters