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HyBoost - Intelligent Electrification

A combination of low cost technologies used with a high degree of synergy to deliver micro-hybrid operation using a combination of gasoline engine downsizing, & intelligent stop/start

Key Facts

Downsized Gasoline Engine:
  • Downsized, highly boosted gasoline engine gives improved fuel economy at low cost
  • Downsizing results in operation at increased load factor improving engine efficiency
  • E-Charger gives improved transient response and increases full load torque capability at low engine speeds
  • "12V+X" floating voltage Ultracapacitor for energy storage
  • Belt Starter Generator (BSG)
E-charger for improved transient response and potential to increase pressure ratio

High speed switched reluctance machine attached to second turbocharger allows for near instantaneous boost independently of engine speed. Extra boost pressure available at low engine speed to supplement conventional turbocharger.

Low Cost Energy Storage:

12V AGM Lead Acid battery plus supercapacitors allows high current operation for e-charger, engine stop/start and supports micro-hybrid operating modes.

  • 12V to 24V DC/DC convertor allows split architecture system - 12V for conventional vehicle systems and 24V for Supercapacitors, BSG and e-charger
  • Compatible with existing 12V vehicle architecture
Micro-Hybrid - 12V or 12+X belt mounted electric machine allowing:
  • Engine stop/start operation
  • Mild regenerative braking
  • Efficient electrical generation (smart charging)
  • Torque assist directly to engine crankshaft
  • Mounted in position of conventional alternator

Targets (C-segment car) <100g/km NEDC CO2; cost below Diesel 

Target Assumptions:
  • Base vehicle (2.0 litre Gasoline): 169g/km
  • Aggressively downsized DI, low loss engine -25%
  • Add stop-start and 6kW re-generation -10%
  • Add cooled EGR and Miller cycle operation -6%
  • Taller gear ratios + gearshift indicator light -7%
  • HyBoost vehicle 99.7g/km

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