What is pfi engine

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Thawko , H. Yadav , A. Eyal , M. Shapiro , L. Particle emissions of direct injection internal combustion engine fed with a hydrogen-rich reformate. This paper presents results from tests using a fuel injection system which uses an ultrasonic atomizer paired with a port fuel injector PFI. This concept was tested on a four stroke cc spark-ignited two-wheeler engine.

A throttle body with a PFI mounted on it was added to the air intake path of the engine, replacing the conventional carburetor. The ultrasonic disc was mounted in such a way, that the injected fuel from the PFI, falls directly on the face of the disc. Subscribers can view annotate, and download all of SAE's content. Learn More ». Diesel Combustion: Advancement in Analysis and Simulation. View Details. Browse Publications Technical Papers Some OEMs are utilizing both port and cylinder injection to reduce the carbon buildup, while other suppliers are working on higher-pressure injection pumps that atomize the fuel better to keep the accumulation to a minimum.

But there is no magic-bullet formula to prevent this carbon accumulation. Advertisement Direct-injected engines also are afflicted by a condition called low-speed pre-ignition LSPI.

LSPI is an abnormal combustion event caused by higher cylinder pressures common in turbocharged GDI engines running in low-speed, high-torque conditions. New computer technology has enabled manufacturers to switch to GDI to allow more precise control of the combustion event and to achieve lower emissions. OEMs and the aftermarket are aware of the condition, and even oil manufacturers are working to solve the problem. A computer that tells the injectors when to spray fuel electronically controls both systems, but the main difference is where each one sprays the fuel.

Port injection sprays fuel into the intake ports, where it mixes with the incoming air. Advertisement The injectors usually are located in the runners of the intake manifold.