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Turbo-Discharging: Predicted Improvements in Engine Fuel Economy and Performance
Technical Paper
2011-01-0371
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The importance of new technologies to improve the performance
and fuel economy of internal combustion engines is now widely
recognized and is essential to achieve CO₂ emissions targets and
energy security. Increased hybridization, combustion improvements,
friction reduction and ancillary developments are all playing an
important part in achieving these goals. Turbocharging technology
is established in the diesel engine field and will become more
prominent as gasoline engine downsizing is more widely introduced
to achieve significant fuel economy improvements.
The work presented here introduces, for the first time, a new
technology that applies conventional turbomachinery hardware to
depressurize the exhaust system of almost any internal combustion
engine by novel routing of the exhaust gases. The exhaust stroke of
the piston is exposed to this low pressure leading to reduced or
even reversed pumping losses, offering ≻5% increased engine torque
and up to 5% reduced fuel consumption. This method has the distinct
advantage of providing performance and fuel economy improvements
without significant changes to the structure of the engine, the
combustion system or lubrication system.
The Turbo-Discharging concept is introduced and analyzed. A
combination of filling/emptying models and 1-D gas dynamic
simulations were used to quantify the energy flows and identify
optimum valve timings and turbomachine characteristics. 1-D gas
dynamic simulation was then used to predict primary fuel economy
benefits from Turbo-Discharging. Secondary benefits, such as
extended knock limits are then discussed.
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Citation
Williams, A., Baker, A., and Garner, C., "Turbo-Discharging: Predicted Improvements in Engine Fuel Economy and Performance," SAE Technical Paper 2011-01-0371, 2011, https://doi.org/10.4271/2011-01-0371.Also In
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