Table of Contents
Why are diesel engines only direct injected?
Direct-injection diesel engines have been widely used on heavy duty applications. In order to reduce NOx emission, injection timing retard and EGR (1) have been employed to reduce the initial burning rate by controlling the combustion temperature and oxygen concentration.
Why do engines use direct injection?
Reducing carbon deposits is another reason to use both types of injection. Studies have shown that direct-injected engines tend to be more prone to carbon deposit engines than port-injected engines, especially on intake valves. By adding port injection, the fuel can wash off those valves to reduce carbon deposits.
What are advantages of using direct fuel injection?
Fuel Direct Injection (GDI) engines presents various benefits, It avoids fuel wall film within the manifold, improves accuracy of air/fuel ratio in the course of dynamics, reduces throttling losses of the gas exchange with the aid of stratified and homogeneous lean operation, higher thermal effectivity by means of …
What is the difference between common rail diesel and direct injection?
A common rail is one of the most important components in a diesel and gasoline direct injection system. The main difference between a direct and a standard injection is the delivery of fuel and the way how this one mixes with incoming air. The increase in the fuel pressure is a result of the latest engines’ design.
Why do diesel engines need no spark plugs?
A diesel engine has no spark plugs. Instead, diesels have a compression ignition and glow plugs that heat the combustion chamber to aid ignition if a diesel engine is cold. According to Skelton, “The difference in diesel is that diesel fuel doesn’t ignite. Instead, the glow plug only heats the combustion chamber.”
What is difference between direct injection and indirect injection?
Indirect injection or (IDI) is when the fuel injection is not directly injected into the combustion chamber. With a direct injection system or (DI) the fuel is injected directly into the combustion chamber, usually on the top of the piston which is designed to control the spread of combustion.