In automobiles, a start-stop system or stop-start system automatically shuts down and restarts the internal combustion engine to reduce the amount of time the engine spends idling, thereby improving fuel economy and reducing emissions. This is most advantageous for vehicles which spend significant amounts of time waiting at traffic lights or frequently come to a stop in traffic jams. This feature is present in hybrid electric vehicles, but has also appeared in vehicles which lack a hybrid electric powertrain. For non-electric vehicles (called micro-hybrids,[1]) fuel economy gains from this technology are typically in the range of 5 to 10 percent.
Since automobile accessories like air conditioners and water pumps have typically been designed to run off a serpentine belt on the engine, those systems must be redesigned to function properly when the engine is turned off.
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