Hybrid and Electric Vehicles An overview

Hybrid and Electric Vehicles An overview. Gyanesh Tiwari Govind Kumar Arpit Jain. Content. Why fuel efficiency is important Environmental impacts and public concerns A short history of electric and hybrid technology How hybrid and electric cars work

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Hybrid and Electric Vehicles An overview

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Hybrid and Electric VehiclesAn overview Gyanesh Tiwari Govind Kumar Arpit Jain
Content • Why fuel efficiency is important • Environmental impacts and public concerns • A short history of electric and hybrid technology • How hybrid and electric cars work • Why they are fuel efficient • Advantages and issues • Technological challenges • Next generation of green vehicles • Q&A
Why fuel efficiency is important World energy shortage and growing demand have caused energy crises World oil consumption, 2007 US Source: www.cia.gov/library/publications/the-world-factbook
Why fuel efficiency is important • Oil Reserves are diminishing • New data shows Canada has world second largest oil reserves after Saudi Arabia
Why fuel efficient cars? • Global warming due to CO2 emission Combustion (burning) Fuel(C,H)+O2  CO2 + CO + H2O + energy(heat) • Toxic pollutants such as SOX and NOX, CO and unburned hydrocarbons CO2 emission 1980-1999 %32 for Transportation
Hybrid cars • Better fuel efficiency, up to %80 theoretically possible • Less CO2 emission and pollution • Lower maintenance About $780/year fuel savings Assume $1 /1L 15000km / year Invaluable benefit for environment Source: www.fueleconomy.gov US DOE
A short history of hybrid & electric cars • 1825 • Steam Engine Car, British inventor Goldsworthy • 85 miles round trip took 10 hours (14 km/h) • 1870 • First electric car was build in Scotland • 1897 • The London Electric Cab Company used a 40-cell battery and 3 horsepower electric motor, • Could be driven 50 miles between charges • 1898 • The German Dr. Porsche, at age 23, Built the world's first front-wheel-drive • Porsche's second car was ahybrid, using an internal combustion engine to spin a generator that provided power to electric motors located in the wheel hubs. On battery alone, the car could travel nearly 40 miles Source: www.hybridcars.com/history
A short history of hybrid & electric cars • 1900 • US car companies made 1,681 steam, 1,575 electric and 936 gasoline cars. • In a poll, electric was the first choice, followed by steam • 1904 • Henry Ford overcame the gasoline engine issues: noise, vibration, and odor • Produced low-priced, lightweight, gas-powered vehicles • Within a few years, the Electric Vehicle Company failed • 1997-99 • Toyota, Audi, Honda, Ford, GM followed by other main car manufactures introduced new generation of electric and hybrid cars • 2004 • The Toyota Prius II won 2004 Car of the Year Awards from Motor Trend Magazine and the North American Auto Show. • Toyota was surprised by the demand and pumped up its production from 36,000 to 47,000 for the U.S Source: www.hybridcars.com/history
Where does fuel energy go in a conventional car • 87.4 % of fuel energy is wasted • Only 12.6 % of fuel energy is transferred to the wheels • 5.8 % is turned to kinetic energy, consumed in the brake • 17.2 % idling losses, engine on with no torque Source: www.fueleconomy.gov US DOE
How hybrids save fuel • Engine is turned off at: • Stops • Lower speed (say less that 15 km/h), an electric motor drives the car until speed reaches a certain limit, then engine kicks in • When vehicle is stopping or going downhill, engine is turned off, Regenerative braking is applied • When engine operates in an inefficient mode(e.g. at very high or very low engine speeds), the electric motor kicks in and assists engine. Engine is driven to its optimum operating zone • Engine can be made smaller, due to electric motor assistance
Vehicle kinetic energy A B • VB > VAaccelerating, fuel is consumed, kinetic energy is increased • VA > VBbraking, vey little fuel is consumed, kinetic energy is reduced • energy is dissipated in the brakes as heat in conventional cars • In hybrids braking energy is recovered by an electric generator and stored in a battery • it is called regenerative energy, or “Regen Energy” A B
Vehicle potential energy • Need engine power, fuel is consumed, potential energy is increased • no need for engine power • Braking, vey little fuel is consumed, potential energy is reduced energy is dissipated in the brakes as heat in conventional cars • In hybrids braking energy is recovered, Engine can be turned off automatically going downhill
Optimum engine operation condition Optimum operating rang Engine Map BSFC [g/kWh]
How Hybrids work Click on the link below to see a hybrid animation Hybrid Demo
A hybrid System VCU • Prius does not have • step gears • clutch or • torque converter • starter motor • alternator Eclectic motors and planetary gear system work as a CVT or Continuously Variable Transmission Schematic diagram of Prius www.cleangreencar.co.nz/page/prius-technical-info
How Hybrids work Eclectic motors and planetary gear system work as a CVT or Continuously Variable Transmission Prius Planetary Gear www.cleangreencar.co.nz/page/prius-technical-info
Hybrid engine and electric motors Hybrid engine is smaller than conventional the engine Prius Hybrid www.cleangreencar.co.nz/page/prius-technical-info
How Electric cars work
Electric cars • Have comparable speed and power • Zero emission for hydro electric grids like BC • High overall fuel efficiency, thermal power plants can have up to 80% efficiency and lower emission • No IC engine, no transmission, no engine oil, no gearbox fluid • Lower maintenance • Lower price • Good for inner city short trips • Simple and mature tech • Low noise 100 years old
Plug in hybrid • Plug in hybrid has advantages of the both • GM 2011 Chevrolet Volt can run for 40 miles on electric power alone • Only uses gasoline to power a generator if the 40-mile range is exceeded Chevrolet Volt
Hybrid cars issues • Currently more expensive than conventional • Heavier than conventional, due to battery pack and electric motors weight • Limited battery life • Expensive battery pack if you want to replace it • Safety issues, high voltage battery and fuel • Reliability, still under study, • More complex computer controlled systems • May have drivability issues • Expensive to repair
Electric cars issues • Needs heavy duty power plug terminal (high current) everywhere: home, parking and street with metering device • Electric energy infrastructure (generation, transmission and distribution) must be expanded to provide extra energy for this type of cars. • Travels short distances, inner city • Low speed • Battery charging takes time • Limited battery life • Safety issues • Need new regulatory standards and • New building electric code
Technology challenges and opportunities • Battery capacity reduces by time, even you do not use it. • This will impact fuel economy • Fuel economy is dependant on battery capacity The Honda Insight’s battery pack 120 Panasonic 1.2-volt cells (total 144 V) Nickel metal hydride 100A discharge, and 50A charge rates The system limits the usable capacity to 4ah to extend battery life
Technology challenges and opportunities • Time of battery changing is long(plug in hybrid) • Batteries are heavy (100kg extra weight consumes 2L/100km more) • Batteries are expensive • Low performance in hot or cold temperatures also may damage the battery • Very sensitive to overcharge/undercharge(Battery life reduces dramatically) • Contain toxic heavy metals, disposal issue Opportunity for researchers: Advance research projects on batteries are supported by governments and industries
Next generation of green vehicles • Plug in hybrids with Lithium Ion Batteries and Ultra Capacitors • Hybrid Buses • Hybrid trucks with compressed gas energy storage systems • Hybrid trains • EVs everywhere Hybrids on the Market
Fail safe systems A fail safe system?

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