Audi Repair & Workshop Manuals

Electronic Fuel Injection SystemTimed fuel injection systems for gasoline engines inject a measured amount of fuel in timed bursts that are synchronized to the intake strokes of the engine. Much more precise management of the fuel injection event also enables far better control of emissions. Later Closed loop fuel injection systems enhanced the air/fuel mixture handle with an exhaust gas oxygen sensor Despite the fact that not element of the injection handle, a catalytic converter additional reduces exhaust emissions. This was created to meet the U.S. emission specifications with no loss in efficiency and it also reduced fuel consumption. The duration that the injector is open (named the pulse width ) is proportional to the amount of fuel delivered.

The relative proportions of air and fuel vary according to the sort of fuel utilized and the overall performance requirements (i.e. power, fuel economy, or exhaust emissions). Following this racetrack good results, the 1955 Mercedes-Benz 300SL , the initially production sports automobile to use fuel injection, used direct injection. An Antoinette mechanically fuel-injected V8 aviation engine of 1909, mounted in a preserved Antoinette VII monoplane aircraft.

Benefits of fuel injection include things like smoother and more constant transient throttle response, such as during speedy throttle transitions, less complicated cold starting, a lot more precise adjustment to account for extremes of ambient temperatures and modifications in air pressure, much more stable idling, decreased maintenance demands, and better fuel efficiency.

The open loop fuel injection systems had currently enhanced cylinder-to-cylinder fuel distribution and engine operation over a wide temperature range, but did not offer you further scope to enough control fuel/air mixtures, in order to further lower exhaust emissions. Single-point injection (SPI) utilizes a single injector at the throttle body (the very same place as was employed by carburetors).

The invention of mechanical injection for gasoline-fueled aviation engines was by the French inventor of the V8 engine configuration, Leon Levavasseur in 1902. Later, far more mainstream applications of fuel injection favored the significantly less-pricey indirect injection methods. As opposed to carburettor-based systems, where the float chamber supplies a reservoir, fuel injected systems depend on an uninterrupted flow of fuel.