Depending on the system design, the timing of when injector opens is either relative each individual cylinder for a sequential fuel injection system, or injectors. Electronic fuel injection systems and components efi supply. Multiport and sequential fuel injection systems both inject atomized fuel into a port just before the intake valve. Sequential fuel injection, also called sequential port fuel injection spfi or timed injection, is a type of multiport injection. The sequential electronic fuel injection sefi system is used on all super high output sho vehicles, as well as on 1993 and later 3. Port fuel injection engines need to run near stoichiometric fuel air mixtures slightly lean is possible, in part because it is difficult to ignite very lean fuel air mixtures. Sequential file article about sequential file by the. The fuel is metered into the intake manifold port, in sequence, in accordance with. Our folks have several options from basic to completely trick.
In sequential port injection cng engines, gas fuel is injected by fuel nozzle injector via intake port into combustion chamber. The ecu commands a constant periodic flow rate, via the injectors, during starting motor action. Pdf automobile engineering report on electronic fuel. Pdf the gasoline engine management system electronically controls combustion parameters amounts of air and fuel and ignition timing to increase. Pdf gasoline engine management systems and components. Pdf this paperwork is proving via numerical simulation using the software fluent that the. Sequential fuel injection with inductive pickup and twostage nitrous system capability wide band oxygen sensing and individual cylinder fuel and spark control options included 302211 30223211 sequential fuel injection with inductive pickup and idle air control 302300 30223300. Semisequential injection same timing as wastespark. Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. Mercedes benz table of contents mercedes 19881995 obd1. This requires the ecu to be synched with the engines cycle. However, for those applications for which sequential injection is desirable to maximize idle stability and smoothness, lower emissions, and make incremental improvements to cruise fuel economy, bowling and grippo are working on the msii sequencer for which will do sequential injection for up to 8 cylinders and can be used to operate cop ignition systems as well.
Sequential fuel injection fuel injection throttle scribd. Engines with multi port injection have a separate fuel injector for each cylinder. This system is sequential multipoint injection system. Certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. Sequential fuel injection, also called sequential port fuel injection. Though basic mpfi employs multiple injectors, they all spray. Siquential vs batch injection fuel injection options ecu. Fitech fuel injection has been supplying automotive products, specifically fuel injection products, since 2012.
Sequential systems fire each injector prior to the opening of its intake valve. The hp and dominator series of ecus can be programmed for sequential fuel strategies. Semi sequential fuel injection semi sequential means that 2 or more cylinders injectors are triggered at the same time, but only 1 time during the engines cycle. Pdf effect of port injection cng engine using injector nozzle. Possibility to operate in standalone nonsequential mode for mechanical fuel injection system. Advantages of direct vs sequential fuel injection motor. By design, port fuel injection creates a homogeneous charge the fuel air ratio is the same everywhere in the cylinder when the spark plug fires. So in essence, the individual injectors work by themselves because they are fired individually. Gas engines can use gasoline direct injection, where the fuel is directly delivered into the combustion chamber, or indirect injection where the fuel is mixed with air before the intake stroke.
Fuel injection technical support holley performance products. Other multiport systems will fire all the injectors in groups no matter if the cylinder is ready or not. A sequential fuel injection is a type of multiport fuel injection system in which each injection valve will open just before the cylinder intake. A sequential fuel injection is a type of multiport fuel injection system in which each injection valve will open just before the cylinder intake valve opens. It is classified as a multipoint, pulse time, speed density control fuel injection system. Pdf a new innovative direct distributed injection system of fuel. There is a difference in the way these systems operate. Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector all diesel engines use fuel injection by design. Technically, all efi systems are sequential in that once all cylinders have been injected, the sequence starts from the beginning again. Our topoftheline sequential electronic fuel injection system, designed for those who demand maximum power and tuning, utilizes the. Multiport injection systems fire the injectors in groups.