Road & Track (June 2015)

Highway & song, June 2015

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Europe, for example, now uses the New European Drive Cycle (NEDC). In Japan, because of the dense urban driving, a 10–15 mode has been defined that captures the high percentage of time spent at idle. 6 along with some useful statistics. 6 shows the wide disparity in vehicle stop time depending on what region of the world is in question. It is clear that idle stop fuel economy under the 10–15 mode will be significantly higher than EPA-city. 6 is the average vehicle speed over these standard drive cycles in column five.

Fuel economy advantages of idle stop range from 5% for mild hybrids to 15% with high electric fraction and DFSO. Fuel economy benefit ranges depend strongly on the particular drive cycle or customer usage pattern. In order to standardise customer driving patterns and usage, various regions and governments have defined standard drive cycles. In North America the Environmental Protection Agency (EPA) has defined several cycles including EPAcity, EPA-highway, EPA-combined and others. Europe, for example, now uses the New European Drive Cycle (NEDC).

38) defines the mechanical efficiency of the engine in terms of its brake and friction MEPs. Fuel consumption, BSFC, is then defined as the indicated specific fuel consumption, ISFC, defined later, diverted by engine mechanical efficiency. Engine volumetric efficiency is a measure of how close the engine is to a positive displacement air pump. Volumetric efficiency is defined as the ratio of actual 40 Propulsion systems for hybrid vehicles air flow through the engine to its ideal air flow, where ‘ideal’ is defined as the displacement volume filled with a fresh charge at standard temperature and pressure.

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