Diesel Engine Technical details:

Diesel Engine Technical details:
The design of Diesel engine is mostly alike the one of the
petrol engine – both have pistons, cylinders, valves. But the
ignition system in Diesel engines is lack in principle. Instead
of the usual spark in Diesel engines the fuel-air mixture is
ignited by high temperature of the compressed air. Let’s
review the Diesel engine operating principle.
The Diesel engine operating scheme
1-th stroke. The piston is moving down till lower dead point
and the fresh air is blown from intake valve.
2-th stroke. The piston is moving up till upper dead point
and the air in the cylinder is compressed multiple times (14
up to 25) and its temperature raises up to 700-800 C.
3-th stroke. At the moment the pistol reaches the upper
dead point the fuel is injected into cylinder. Combustion act.
The fuel-air mixture is expands and the piston is going
down.
4-th stroke. The piston is going down, and gases are
exhausted throw the open exhaust valve.
The fuel in the cylinder ignites with rapid pressure jump that
makes the engine to work noisy and with vibration. To
preserve the operation safety on the required level the Diesel
engine is designed much more durable than the petrol
engine. More durability assumes more heavy-weighted.
The fuel supply system of Diesel engine also differs from the
petrol-powered engine. The first thing to say it is more
complicated. The fuel in the combustion chamber should be
injected under high pressure and it is very minor in volume.
The engine is controlled by the electronic unit, which
controls the fuel pump and the injector according to data get
from sensors. That kind of design makes the engine much
more expensive.