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|Title: ||Turbo-discharging: predicted improvements in engine fuel economy and performance|
|Authors: ||Williams, Andrew M.|
Garner, Colin P.
|Issue Date: ||2011|
|Publisher: ||© SAE International|
|Citation: ||WILLIAMS, A.W., BAKER, A.T. and GARNER, C.P., 2011. Turbo-discharging: predicted improvements in engine fuel economy and performance. IN: Proceedings of SAE 2011 World Congress & Exhibition, Detroit, USA, 12th-14th April.|
|Series/Report no.: ||SAE Technical Papers;2011-01-0371|
|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 hybridisation, 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.|
|Description: ||This conference paper [2011 © SAE International] was posted on this site with permission from SAE International. Further use and distribution of this paper requires permission from SAE International.|
|Publisher Link: ||http://dx.doi.org/10.4271/2011-01-0371|
|Appears in Collections:||Conference Papers (Mechanical and Manufacturing Engineering)|
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