Propulsion Systems for Hybrid Vehicles John Miller 2004
内容简介:
Hybrid propulsion concepts are re-emerging as enablers to improved fuel economy, reduced emissions, and as performance enhancements to conventional petroleum fuelled passenger vehicles. Conventional vehicle power plants will continue to make significant progress in all of these areas and through innovations in gasoline engine fuel conversion efficiency, cleaner and quieter diesel fuelled engines and increased use of alternative fuels. Vehicle power plants will become more efficient through incremental improvements in engine friction reduction, use of lower viscosity lubricants, pumping loss reduction and by more efficient ancillaries. Further engine improvements will be gained through the introduction of new technologies such as engine valve actuation, gas direct injection, variable compression ratio, cylinder deactivation, turbo charging and supercharging. In parallel to these developments will be the use of alternative fuel stocks for spark ignited (SI) engines that include more pervasive use of natural gas and hydrogen. Compression ignited direct injected (CIDI) engines will run cleaner and quieter on diesel fuels. The distinction between SI and CIDI engines will become blurred as activated radical or homogeneous charge compression ignition (HCCI, as it is more commonly referred to) combustion processes are further understood and controlled. Ultimate ICE efficiency is claimed to be 60% when these innovations are introduced. Vehicles themselves will continue to see
reductions in aerodynamic drag, weight reduction through the use of lighter materials such as aluminum and carbon composites, and lower rolling resistance tyres. Further electrification of power train and chassis functions such as electric assist power steering, braking and suspension will push economy gains even higher. The electrical system of conventional passenger vehicles will also undergo radical change as efficiency demands, combined with more and higher powered electrical ancillaries and accessories, gain widespread acceptance. The proposed 42V PowerNet as the next generation electrical system is already being introduced into production vehicles.
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发表于 2011-1-22 05:26:46
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