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Energy recovery systems in automobile



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Energy recovery systems in automobile

  1. 1. Isaac Duroher – MI3
  2. 2. 0,01 𝑘𝑊 0,02 𝑘𝑊 50 °𝐶 0,4 𝑘𝑊 2 𝑘𝑊 Low Energy Light bulb Neon Light Radiator @ Cyclist in full effort Can you guess how much power (in kW) the following consume? 80 Horsepower City Car 59 kW
  3. 3. Only 35% of the combustion energy of an engine is used for propulsion. 80 Horsepower City Car 59 kW 38kW go to waste The energy lost by all cars in France approximately 44.3% (nearly 500 GWh/day) of the electrical energy produced by the entire French nuclear fleet! • 1kW=one thousand (103) watts • 1GW=one billion (109) watts = parc nucléaire
  4. 4. Tires Brakes Radiator Shock Absorbers Engine Exhaust pipe Where do all these losses take place? Thermal energy Kinetic energy Brakes
  5. 5. The Solution Recover and reuse the wasted energy Kinetic energy recovery system (often known simply as KERS ) How? • Recovers kinetic energy generated by the braking • Recovered energy is stored in a reservoir flywheel  flywheel KERS high voltage batteries  battery KERS • Invented in 1950 by American physicist Richard Feynman Flywheel=volant d'inertie
  6. 6. Flywheel KERS carbon fiber rim (either a ring or tube) clutch=embrayage
  7. 7. • Advantage: no conversion of the energy in another form  This reduces the inevitable losses during the mechanical / electrical conversion • Disadvantage: weight and bulk. Flywheel KERS =encombrement 3D view of the previous picture
  8. 8. Yield and industrial applications • Formula 1 : 400 kJ issued by the KERS  the equivalent in petroleum: 0.021 liter/lap 1.47 liter/Grand Prix • Volvo: considering a 20% reduction in fuel consumption Flywheel KERS Yield= rendement
  9. 9. Battery KERS The crankshaft (1) is "boosted" by an electric motor (3) that is supplied by a battery (2) vilebrequin
  10. 10. • Advantages: lighter and more compact than the flywheel KERS. • Disadvantages:  the battery can be pretty heavy  battery life reduced because of the rapid charge and discharge. Battery KERS Industrial application: Formula 1
  11. 11. What energy? Where ? How? Conversion ? Storage ? Use? Yield? Recover the lost energy Mecanical Energy Braking system KERS (most common) Mecanical to electrical energy Battery Restart or accelerate No info found No conversion Flywheel Restart or accelerate 0.8 for 15 min Exhaust Gases Turbo- compound Mecanical to electrical energy Battery Increase engine’s power Fuel savings of 10% Tires & Suspension Piezoelectric microsystems (MEMS) Pressure energy to electricity No info found Supplying power to autonomous sensors At 70 km / h, producing 42 microwatts. Shock Absorbers Vibrations to electricity Battery Power electronic components Reduced consumptionb y 2 to 10% Thermal Energy Exhaust pipes and radiator Rankine Cycle Thermal to mecanical energy Battery Power electronic components Fuel savings of 10% Direct heat utilization No conversion No storage Heat the cabin No info found Decrease the engine warm- up time No info found Thermo- electricity Thermal to electrical energy Battery Power vehicle & electronic components Gain of 5% to 10% of fuel Shape- memory alloy Thermal to mecanical then electric energy No storage Power electronic components No info found Other existing systems
  12. 12. Other existing systems Shape memory alloys Thermoelectricity energy recovery shock absorber Rankine Cycle Turbocompound Piezoelectric microsystems Thermal to mecanical energy Pressure energy to electricity Thermal to electrical energy Mecanical to electrical energy Vibrations to electricity Thermal to mecanical then electric energy