how do fuelinjectors work in diesel motors?

Answer 1

Rudolf Diesel developed the idea for the diesel engine and obtained the German patent for it in 1892. His goal was to create an engine with high efficiency. Gasoline engines had been invented in 1876 and, especially at that time, were not very efficient.







The main differences between the gasoline engine and the diesel engine are:

A gasoline engine intakes a mixture of gas and air, compresses it and ignites the mixture with a spark. A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.

A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency.

Gasoline engines generally use either carburetion, in which the air and fuel is mixed long before the air enters the cylinder, or port fuel injection, in which the fuel is injected just prior to the intake stroke (outside the cylinder). Diesel engines use direct fuel injection -- the diesel fuel is injected directly into the cylinder.
The following animation shows the diesel cycle in action. You can compare it to the animation of the gasoline engine to see the differences:



Image courtesy Baris Mengutay
Note that the diesel engine has no spark plug, that it intakes air and compresses it, and that it then injects the fuel directly into the combustion chamber (direct injection). It is the heat of the compressed air that lights the fuel in a diesel engine.

The injector on a diesel engine is its most complex component and has been the subject of a great deal of experimentation -- in any particular engine it may be located in a variety of places. The injector has to be able to withstand the temperature and pressure inside the cylinder and still deliver the fuel in a fine mist. Getting the mist circulated in the cylinder so that it is evenly distributed is also a problem, so some diesel engines employ special induction valves, pre-combustion chambers or other devices to swirl the air in the combustion chamber or otherwise improve the ignition and combustion process.

Horsepower
For a complete explanation of what horsepower is and what it means to engine performance, check out How Horsepower Works!

One big difference between a diesel engine and a gas engine is in the injection process. Most car engines use port injection or a carburetor rather than direct injection. In a car engine, therefore, all of the fuel is loaded into the cylinder during the intake stroke and then compressed. The compression of the fuel/air mixture limits the compression ratio of the engine -- if it compresses the air too much, the fuel/air mixture spontaneously ignites and causes knocking. A diesel compresses only air, so the compression ratio can be much higher. The higher the compression ratio, the more power is generated.


Some diesel engines contain a glow plug of some sort (not shown in this figure). When a diesel engine is cold, the compression process may not raise the air to a high enough temperature to ignite the fuel. The glow plug is an electrically heated wire (think of the hot wires you see in a toaster) that helps ignite the fuel when the engine is cold so that the engine can start. According to Cley Brotherton, a Journeyman heavy equipment technician:

All functions in a modern engine are controlled by the ECM communicating with an elaborate set of sensors measuring everything from R.P.M. to engine coolant and oil temperatures and even engine position (i.e. T.D.C.). Glow plugs are rarely used today on larger engines. The ECM senses ambient air temperature and retards the timing of the engine in cold weather so the injector sprays the fuel at a later time. The air in the cylinder is compressed more, creating more heat, which aids in starting.
Smaller engines and engines that do not have such advanced computer control use glow plugs to solve the cold-starting problem.

Diesel Fuel
If you have ever compared diesel fuel and gasoline, you know that they are different. They certainly smell different. Diesel fuel is heavier and oilier. Diesel fuel evaporates much more slowly than gasoline -- its boiling point is actually higher than the boiling point of water. You will often hear diesel fuel referred to as "diesel oil" because it is so oily.
Diesel fuel evaporates more slowly because it is heavier. It contains more carbon atoms in longer chains than gasoline does (gasoline is typically C9H20, while diesel fuel is typically C14H30). It takes less refining to create diesel fuel, which is why it is generally cheaper than gasoline.

Diesel fuel has a higher energy density than gasoline. On average, 1 gallon (3.8 L) of diesel fuel contains approximately 155x106 joules (147,000 BTU), while 1 gallon of gasoline contains 132x106 joules (125,000 BTU). This, combined with the improved efficiency of diesel engines, explains why diesel engines get better mileage than equivalent gasoline engines.

For more information on diesel engines and related topics, check out the links on the next page.

Answer 2

Two basic types these days newest are common rail direct injection Isuzu uses Called the DURA-MAX in GMC trucks The rail refers to diesel supply tube and the injectors are electromagnet opening devices that spray directly into a combustion chamber. And are controled acurately by the engine control module.
And old school a mechanically timed injection pump attached to the side or top of the engine tooth belt or chain driven this complex pump built up to 1,000 moving parts can pump up to 2,500 psi and timed the squirt and amount of fuel attached to the throttle inside the truck more throttle more fuel. Fuel delevery to the injectors was specially formed metal lines to strong injectors that inside have springs and pintle to control the precise opening pressure of the spray of diesel.
So in review electronic direct injection Newer more precise And the type used for many years mechanical direct injection Very dependable.

Answer 3

you may wager MY funds they are heavy into R&D with Bio-Diesel, Hydrogen, Electro-cells, and so on. and so on. they have were given more beneficial funds than they recognize what to do with, that's why Scion even got here into existence. Toyota will be exciting to visual demonstrate unit in the subsequent couple of years. keep in concepts, that the layout for the Mark 4 Supra? (1992-1998 i imagine) changed into advanced in the early 80's and immediately must be nonetheless between the most powerful and well-known automobiles on the line. in basic terms imagine about what they are dreaming up almost 30 years later. imagine about what percentage advances we've considered in the most suitable 30 years. in the adventure that they don't improve Bio-Diesel to that's fullest, it in simple terms signifies that they have got something more beneficial sensible up their sleeve. Cheers, Ryan

Answer 4

the fuel is compressed to very high PSI within the tube leading up to the injector and when its time for the it to inject all it dose is open a small hole into the cylinder and the pressure of the fuel makes it atomise into the cylinder.

Answer 5

The same as in gas engines.