10-11-2012, 12:05 PM
HYBRID VEHICLES:HYBRID VEHICLES:What And Why?
Hybrid vehicles.pptx (Size: 392.82 KB / Downloads: 43)
Hybrid Vehicles
Have two (or more) energy storage devices
Have two (or more) power paths
Are executed to produce better emissions and fuel economy
Are more costly
Are more complex
Types of Hybrid systems:
Series System:-
It is the system in which driven generator is employed to recharge the batteries, while the electric motor drives the car. In this way the range of the car is extended.
However, this system involves significant mechanical-electrical-mechanical conversion losses and is thus very inefficient.
Parallel system
It is the system in which heat engine and the electric motor are both directly connected to the car wheels.
The recharging of the batteries is to be only at home when the car is not in use. The advantages of this type of system is that the both systems i.e. heat engine & battery power simultaneously, due to which the vehicle has more power.
And as the power is directly carried to the road, it is more efficient.
Hybrid System Issues:
Vehicle mission and technical specifications
Degree of hybridization
Vehicle mass (target vs. feasible or realistic estimate)
Dealing with energy storage charging/discharging
Dealing with energy and emission penalties when restarting engine
Drive quality when launching vehicle and restarting the engine
Component sizing for vehicle performance requirements
Energy management strategy for maximum fuel economy gains
Summary / Conclusion
The Configuration of a Hybrid Vehicle Depends on the Mission it Must Fulfill
Hybrid vehicles can contribute to cleaner air and reduced energy consumption.
The magnitude of fuel economy gain depends strongly on vehicle performance requirements and energy management strategy:
Significant challenges must still be overcome in cost, complexity, reliability, and customer acceptance