What are the different types of fuel injection in your vehicle? The fuel injection types used in newer cars include four basic types:.
For some automakers, single-point injection was a stepping stone to the more complex multipoint system. Though not as precise as the systems that have followed, TBI meters fuel with better control than a carburetor and is less expensive and easier to service. Multipoint fuel injection devotes a separate injector nozzle to each cylinder, right outside its intake port, which is why the system is sometimes called port injection.
Shooting the fuel vapor this close to the intake port almost ensures that it will be drawn completely into the cylinder.
The main advantage is that MPFI meters fuel more precisely than do TBI designs, better achieving the desired air-fuel ratio and improving all related aspects.
Also, it virtually eliminates the possibility that fuel will condense or collect in the intake manifold. This is unnecessary on engines equipped with MPFI, so the intake manifold can be formed from lighter-weight material, even plastic.
Port or Multipoint Fuel Injection
Incremental fuel-economy improvements result. Also, where conventional metal intake manifolds must be located atop the engine to conduct heat, those used in MPFI can be placed more creatively, granting engineers design flexibility.
Sequential fuel injection, also called sequential port fuel injection SPFI or timed injection, is a type of multiport injection. Though basic MPFI employs multiple injectors, they all spray their fuel at the same time or in groups.
Timed like spark plugs, they spray the fuel immediately before or as their intake valve opens. It seems like a minor step, but efficiency and emissions improvements come in very small doses.
Direct injection takes the fuel injection concept about as far as it can go, injecting fuel directly into the combustion chambers, past the valves. More common in diesel engines, direct injection is starting to pop up in gasoline engine designs, sometimes called DIG for direct-injection gasoline.
Again, fuel metering is even more precise than in the other injection schemes, and the direct injection gives engineers yet another variable to influence precisely how combustion occurs in the cylinders. The science of engine design scrutinizes how the air-fuel mixture swirls around in the cylinders and how the explosion travels from the ignition point.
Things such as the shape of cylinders and pistons; port and spark plug locations; timing, duration and intensity of the spark; and number of spark plugs per cylinder more than one is possible all affect how evenly and completely fuel combusts in a gasoline engine.
Direct injection is another tool in that discipline, one that can be used in low-emissions lean-burn engines. In line with Cars.
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