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Idle speed, sometimes simply called "idle", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft.
An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed . [1] In carburetted vehicles a similar device known as an idle speed control actuator is used.
The limiter may be considered as setting the maximum speed (with throttle kickdown to override it) easing the throttle to reduce speed, whereas cruise control sets the minimum speed (with the brake pedal to override it) pressing on the throttle to increase speed. The limiter may shift down through automatic gears to hold the maximum speed.
A Honda K24A Engine with i-VTEC. VTEC (described as Variable Valve Timing & Lift Electronic Control, but stands for Valve Timing Electronically Controlled) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM.
Low Speed Operation Low Speed Operation High Speed Operation All Conditions Primary Intake Valve: Secondary Intake Valve: Both Intake Valve: Exhaust Valve Valve Opens: 24° ATDC: 26° ATDC: 0° TDC: 30° BBDC Valve Closes: 23° ABDC: 76° BBDC: 36° ABDC: 15° BTDC Lift: 7 mm (0.28 in) 1.8 mm (0.071 in) 10 mm (0.39 in) 9 mm (0.35 in)
Honda K24A4 2.4L DOHC i-VTEC Engine installed in 2003 Honda Accord. The Honda K-series engine is a line of four-cylinder four-stroke car engines introduced in 2001. The K-series engines are equipped with DOHC valvetrains and use roller rockers on the cylinder head to reduce friction.
This method uses two cam profiles, with an actuator to swap between the profiles (usually at a specific engine speed). Cam switching can also provide variable valve lift and variable duration, however the adjustment is discrete rather than continuous. The first production use of this system was Honda's VTEC system. VTEC changes hydraulic ...
With the electrical generator (a large dynamo) for the motor permanently connected to the petrol engine, the early petrol electric controls available were a sprung return throttle pedal (with a hand-operated variable latching throttle to set and adjust the idle speed), a brake pedal, a means of steering (wheel, etc.) and two usually column ...