Engineer World

Fuel-Injection System is vital to the working and performance of CI engine  This system serves the purpose of initiating and controlling the combustion to meet the demand requirements  Fuel is injected into combustion chamber towards the end of compression.  It is atomized as it enters under high velocity and the droplets get vaporized to form a fuel-air mixture. Functional Requirements of an Injection System:  The following requirements must be met by the Fuel Injection (FI) System:  Accurate metering of fuel injected per cycle to meet changing demand of speed & load. Precise timing of fuel injection in the cycle to ensure performance; power, fuel economy, emissions. Proper control of rate of injection to achieve desired heat release during combustion without knocking.  Proper atomization of fuel into fine droplets  Proper spray pattern to ensure rapid mixing of fuel & air  Uniform distribution of fuel droplets throughout t...

Ignition system is a system in an internal combustion engine that produces the spark to ignite the mixture of fuel and air.  It includes the battery, ignition coil, distributor, spark plugs, and associated switches and wiring.  It is a part of the electrical system which carries the electrical current to a current plug.  It gives the spark to ignite the air-fuel mixture at the correct time Ignition Function:   It produces 30,000 volt spark across spark plug  It Distributes high voltage spark to each spark plug in correct sequence  Time of the spark occurs when piston is near to top dead center  Spark timing varies with load, speed, and other conditions Basic Ignition System: The components in ignition system are as follow:  Battery,  Switch ignition distributor  Ignition coil  Spark plugs and  Necessary wiring Ignition System types: A battery of 12 volts is generally employed. However, a very high voltage surge (of...