| Idle Speed |
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Because an engine at idle may not produce enough power to overcome the Inertia of the Drivetrain , the engine must either be disconnected from the drivetrain by shifting to neutral or disengaging the Clutch or through use of a Fluid Coupling whose Slippage will allow the engine to run without moving the Transmission gears. If the engine is operating a large number of accessories, particularly Air Conditioning , the idle speed must be raised to insure that the engine generates enough power to run smoothly and operate the accessories. Most air conditioning-equipped engines have an automatic adjustment feature in the Carburetor or Fuel Injection system that raises the idle when the air conditioning is running. Engines optimized for power at high engine speeds, such as Auto Racing engines, frequently have poor low-speed power, and tend to be very rough at idle unless the idle speed is raised significantly. Effort has been made to reduce the amount of time engines spend idling, chiefly due to s (APUs) to run accessories more efficiently while the truck is parked. Hybrid Vehicle s typically shut down their internal combustion engines while stopped, though some conventional vehicles are also including Start-stop System s to shut off the engine when it would otherwise idle. |
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