In the internal combustion engine for spark ignition (ICE),
the process is determining the angle for the piston position and the angular
speed of the crankshaft that will spark a spark in the combustion chamber near
the end of the blow stroke.
For the engine to operate at its best, the fuel / air
mixture in each cylinder should be released as the piston reaches the top of
the dead center (TDC). It takes a certain amount of time to ignite the spark
plug and to create the combustion to build up. This time it stays the same no
matter how fast the engine is running.
The timing mechanism is set to launch the plug shortly
before the TDC. But since the engine is powered by engine movement, this time
it will usually decrease with the engine running faster, and the plug will
shoot very late. So the mechanical device is equipped with progress - make it
happen early - with engine speed increasing.
The load on the engine - whether pulling strongly or
cruising - also affects timing. Adjusting the correct ignition timing is
critical to engine performance. Sparks that occur too early or late in the
engine cycle are often responsible for excessive vibration and even engine
damage. Ignition timing affects many variables including engine longevity, fuel
economy, and engine power. Real-time controlled motors using the engine control
unit use a computer to control timing during the engine cycle per minute and
load range. The older motors using mechanical spark dispensers rely on inertia
(using weights and roller springs) and the vacuum to adjust the ignition timing
throughout the engine cycle per minute and the loading range.
Early cars required the driver to adjust the timing through
controls according to driving conditions, but this is now automatic.
Factors that affect the correct ignition timing: for a
particular motor. This includes the timing of the exhaust valve or fuel
injector, the type of ignition system used, the type and condition of the
ignition plugs, the contents and impurities of the fuel, the fuel temperature
and pressure, engine speed and load, air and engine temperature, The components
used in the ignition system, and ignition system components settings.
Typically, any major engine changes or upgrades will require a change in engine
ignition timing settings
0 Comments