What happens in a diesel engine on the compression stroke?

In direct-injection compression-ignition engines, commonly known as diesel or CI engines, only air is drawn into the cylinder during the intake stroke. The air is then compressed, reaching temperatures and pressures that exceed the ignition point of the fuel.

Is fuel injected before or after TDC?

In a fuel injection engine, the intake valves release air into the cylinder. The piston moves upward toward TDC, compressing the air, and the intake and exhaust valves close. Diesel fuel injects, right before the piston reaches the top. The air-fuel mixture reaches its maximum pressure when the piston reaches TDC.

What stroke is fuel injected in a diesel engine?

A two-stroke diesel engine is an internal combustion engine that uses compression ignition, with a two-stroke combustion cycle. It was invented by Hugo Güldner in 1899. In compression ignition, air is first compressed and heated; fuel is then injected into the cylinder, causing it to self-ignite.

Why do diesel engines have fuel return lines?

Diesel has a return line because the fuel is injected via the Injectors. In a very dynamic and transient conditions, the load or need for fuel varies very radically. in that case the Diesel Injector may have extra quantity at a very high pressure due to the previous demand.

What device part of the diesel engine burns the fuel during power stroke of the piston?

After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke. In a diesel engine, only air is inducted into the engine and then compressed.

What is the injection timing of diesel engine?

Injection timing is the timing of when fuel is injected into the cylinder, which alters when the combustion takes place. The time of when fuel is injected can be altered to be injected at different points in time.

Why does fuel injection need a return line?

The return line returns excess fuel to maintain fuel pressure in the throttle body.

What is the purpose of a return fuel line?

It’s primary purpose is to return excess fuel from the carburetor to the fuel pump, however it serves other important functions as well. Aside from providing a path for excess fuel to return to the tank, the fuel return hose also prevents vapor lock and over pressurization from occurring within the carburetor.

What happens during the compression stroke of a diesel engine?

During the compression stroke, the intake and exhaust valves are closed. As the piston moves up, it compresses the air trapped in the cylinder. The direct fuel injector injects gasoline under a very high pressure into the cylinder during the compression stroke, when the piston is closer to the top.

How does a diesel four-stroke engine work?

Four-stroke diesel engine animation. The diesel four-stroke engine works the same way, but in a diesel engine, there is no spark plug. The diesel fuel ignites due to the high temperature of the compressed air. For this reason, a diesel engine has a higher compression ratio achieved by reducing the size of the combustion chamber.

How does the fuel injection work in a diesel engine?

Diesel’s original engine injected fuel with the assistance of compressed air, which atomized the fuel and forced it into the engine through a nozzle (a similar principle to an aerosol spray). The nozzle opening was closed by a pin valve lifted by the camshaft to initiate the fuel injection before top dead centre (TDC).

What are the characteristics of a diesel engine?

The characteristics of a Diesel engine are. Compression ignition: Due to almost adiabatic compression, the fuel ignites without any ignition-initiating apparatus such as spark plugs. Mixture formation inside the combustion chamber: Air and fuel are mixed in the combustion chamber and not in the inlet manifold.