Due to its qualities, the diesel engine is widely used in trucks and SUVs. At the same time, most passenger cars have diesel engines in their engine lineup. If your diesel engine is badly damaged, it makes sense to contact scrap car company.
The diesel engine operating principle is based on spontaneous (compression) ignition of the diesel fuel, injected into the combustion chamber and mixed with the compressed and heated to high temperature air.
Unlike the gasoline engine, the diesel engine:
has a higher compression ratio and as a consequence a higher efficiency, greater weight and dimensions, low fuel consumption;
has a low crankshaft speed and, as a consequence, a lower specific power, accompanied by incomplete fuel combustion, soot formation;
has no throttle, so it develops high torque at low RPM;
has a complex design of fuel equipment and, as a consequence, high sensitivity to fuel quality.
The main directions of the diesel engines improvement are:
reduction of fuel consumption;
reduction of exhaust gases toxicity;
increase in the engine power;
lower noise level;
ease of cold starting.
The Common Rail injection system involves the accumulation of fuel in a high-pressure accumulator and its injection by electronically controlled injectors. The electronics ensure that the fuel is injected in strictly defined portions, thus achieving high economy, complete combustion and increased power. If necessary the fuel can be injected several times during the same cycle.
The exhaust system of a modern diesel engine is designed to reduce soot, unburned hydrocarbons and nitrogen oxides in the exhaust gases. For this purpose, a catalytically coated particulate filter is installed in the system. The soot accumulated in the filter is removed through active and passive regeneration.
The exhaust gas recirculation system is designed to reduce the nitrogen oxide content in the exhaust gases by returning a portion of the gases to the intake manifold. To increase the efficiency of the system, the exhaust gases are forcibly cooled in a special cooler included in the engine cooling system.
The intake system of the diesel engine can be equipped with intake flaps. The use of the flaps forms two intake channels, provides air flow turbulence and improved mixture formation in all modes. When starting the engine and operating at low RPM, the flaps are closed, while at high crankshaft speed and torque they are open. Closing the flaps results in a reduction of carbon monoxide and unburned hydrocarbons in the exhaust gases.
The most effective system for increasing the power of a diesel engine is turbocharging. In order to create the optimum boost pressure in all engine operating modes, the system uses a turbocharger with variable turbine geometry.
To facilitate starting the diesel engine in cold weather, a preheating system is used, which is an electronically controlled glow plug installed in the intake manifold.