AIR FUEL RATIO

A Good Mixture of Air and Fuel
So that gasoline can be burned completely, gasoline must be vaporized with air that will be burned using spark plug.car use in changeable conditions, and fuel requirements fluctuate. some conditions are:

1. when the air temperature changes from high to low
2. when road conditions change from land to rise and heavy load
3. when the engine running from idle speed to acceleration

Air Fuel Ratio
 is the ratio between air masses with a mixture of fuel, if too much or too little result will not be perfect for combustion engines. at least 14.7 parts air to 1 part gasoline to burn, this is a mix of theoretical, but in a various of conditions needed changing mixture to increase engine power.

Air Fuel Ratio in Driving Conditions

•  Starting

wall at this point intake manifold and cylinder head still cold, so that the fuel injector spray stick at intake manyfold and cylinder,air fuel ratio too lean,and engine difficult to running,so that need to increase air fuel ratio to be rich mixture,so that to easy engine running.

• Warming up

the coolant temperature, evaporation of gasoline is higher, resulting in a process not a good start, as a result require a rich fuel mixture, this condition occurs when the engine running after starting

• Acceleration 

when stepped on the gas pedal, the fuel supply is reduced due to the difference in pressure, resulting in reduced fuel mixture, so that the fuel mixture richer in need.

• Constan Driving 

These conditions fuel mixture close to the theoretical ratio

• Carry Heavy Load   

 At present a richer mixture is needed to lower combustion temperature, and keep all the intakes used in the combustion

• Deceleration

because the current engine output is not needed, disconnect the fuel in the exhaust gas to cleanrest

description above is about the conditions air fuel ratio on the car ,find another article about the engine, electrical and chassis on this blog