The market penetration of non-hybrid stop-start systems on cars grew from 9.1% in 2016 to 14.2% in 2017 while light trucks nearly doubled, reaching 20.3% in 2017, according to figures gathered by the US Department of Energy (DOE).
|Source: DOE. Click to enlarge.|
Stop-start systems have been used on hybrid vehicles since hybrids were first introduced almost 20 years ago. In recent years, manufacturers have begun installing stop-start systems in non-hybrid vehicles as well.
A vehicle equipped with stop-start will shut down the engine when the vehicle is stopped and start the engine when the brake pedal is released to reduce engine idle time. This is particularly effective in city driving where brief but frequent stops are required due to traffic lights and congestion. Engines with stop-start technology have different architecture to prevent premature wear of engine components, including the starter.
According to the Environmental Protection Agency (EPA), stop-start systems improve fuel economy by about 4-5%.