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\f0\fs24 \cf0 How car manufacturers cheat at tests \
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\cf0 Vehicle certification requires new car models to go for a 20 - minute simulated drive on a "rolling road" while hooked up to test equipment.  the car's computer optimises the engine to run cleanest during the test\
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\cf0 Electronic control Module \
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ECM monitors and regulates air - fuel mixture, engine temperature, ignition and exhaust gas temperature.  This controls emissions and fuel economy\
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18cm\
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\cf0 Operating modes\
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ECM has On Road mode for normal driving and Dyno - test mode.  ECM is calibrated by manufacturer for best results during test mode\
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Screen displays drive cycle to be followed \
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Data acquisition cabinet \
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Speed - matched fan to simulate vehicle cooling \
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Chassis dynamometer\
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Flow meter measures fuel economy \
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Tailpipe emission measuring equipment\
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Rear wheels are locked \
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Dynamometer test procedure \
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Vehicle placed on dynamometer with only its driving wheels rolling.  ECM switches to Dyno mode, otherwise test procedure could be interpreted as dangerous driving situation.  \
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Source: U.S. Department of Energy.  Argonne National Laboratory\
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