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The term Mechanical when applied to fuel injection is used to indicate that metering functions of the fuel injection (how the correct amount of fuel for any given situation is determined and delivered) is not achieved electronically but rather through mechanical means alone. Because of its greater immunity to wildly changing g-forces on the engine, the concept was adapted for use in gasoline-powered aircraft during World War II, and direct injection was employed in some notable designs like the Junkers Jumo 210, the Daimler-Benz DB 601, the BMW 801, the Shvetsov ASh-82FN (M-82FN) and later versions of the Wright R-3350 used in the? B-29 Superfortress. Fuel injection was in widespread commercial use in diesel engines by the mid-1920s. They are often started on gasoline and then switched to diesel or kerosene. Hesselman engines use the ultra lean burn principle fuel is injected toward the end of the compression stroke, and then ignited with a spark plug. The first use of direct gasoline injection was on the Hesselman engine invented by Swedish engineer Jonas Hesselman in 1925. This system was used on the hot bulb engine and was adapted and improved by Robert Bosch for use on diesel engines. History and Development Herbert Akroyd Stuart developed the first system laid out on modern lines to meter out fuel oil at high pressure to an injector. ability to accommodate alternative fuels.There are several competing objectives such as: All share the central task of supplying fuel to the combustion process, but it is a design decision how a particular system will be optimized. The functional objectives for fuel injection systems can vary.
#Electronic fuel injection system ppt download drivers#
So the cars of today are really intelligent, well not as intelligent as drivers but fairly intelligent to keep pollution under control and saving the fuel.
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It will typically judge this by the amount of pressure you put on accelerator. For example, if you have a habit of speedy pick-up, car?s computer will remember that and will give you more power at low engine speeds by putting extra petrol, so that you get a good pick-up. Modern car?s computers have memory, which will remember your driving style and will behave in a way so that you get the desired power output from engine based on your driving style. To make things more interesting, the system also learns from the drivers driving habits. Thus it makes it fuel efficient as it knows what amount of petrol should go in. But with the advancement of technology this was about to change.īased on various inputs from the sensors, the computer in the MPFI system decides what amount of fuel to inject. It was not very efficient in burning petrol it will burn more petrol than needed at times and will produce more pollution.
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This system is purely a mechanical machine with little or no intelligence. Carburetor was one chamber where petrol and air was mixed in a fixed ratio and then sent to cylinders to burn it to produce power. In plain words, to burn petrol in an Engine to produce power, Petrol has to be mixed with some air, ignited in a cylinder (also called combustion chamber), which produces energy and runs the engine.īefore MPFI system was discovered, there was a technology called ? Carburetor?. So in case of an MPFI engine, there is one fuel ?injector installed near each cylinder, that is why they call it Multi-point (more than one points) Fuel Injection. A Petrol car?s engine usually has three or more cylinders or fuel burning zones. MPFI System is a system which uses a small computer to control the Car?s Engine. For Diesel Engines, there is a similar technology called CRDI. The term MPFI is used to specify a technology used in Gasoline/petrol Engines. MPFI means ? Multi-point Fuel-Injection (also called fuel-injection system)