Table of Contents
What are the three phases of diesel injection?
The combustion process is usually described in terms of three distinct phases, Figure 2: Ignition delay (a → b) Premixed combustion (b → c) Rate controlled combustion (c → d)
What type of injection does a diesel engine use?
All diesel (compression-ignition) engines use fuel injection, and many Otto (spark-ignition) engines use fuel injection of one kind or another.
What are the four types of fuel injection?
The fuel injection types used in newer cars include four basic types:
- Single-point or throttle body injection.
- Port or multipoint fuel injection.
- Sequential fuel injection.
- Direct injection.
What is afterburning in diesel engine?
After burning is said to occur when the third phase of combustion extends over a long period. It may be caused by incorrect fuel grade, bad atomization, poor or excess penetration, incorrect fuel temperature, incorrect injection timing, insufficient air supply, or any combination of these.
What is multi port injection?
The MPFI is a system or method of injecting fuel into internal combustion engine through multi ports situated on intake valve of each cylinder. It delivers an exact quantity of fuel in each cylinder at the right time. There are three types of MPFI systems – Batched, Simultaneous and Sequential.
What is a secondary air injection system?
The secondary air injection system, is actually a component of the exhaust system. Since no internal combustion engine is 100\% efficient, there will always be some unburned fuel in the exhaust. Consequently, this increases hydrocarbon emissions.
What is the purpose of secondary injection testing?
The purpose of secondary injection testing is to prove the correct operation of the protection scheme that is downstream from the inputs to the protection relay (s). Why done prior to primary injection tests? This is because the risks during initial testing to the LV side of the equipment under test are minimized.
How does the air injection system work?
As a result, the air injection system was created. NOTE: This system works in harmony with, the Exhaust Gas Recirculation (EGR) and Catalytic Converter, to complete the Emission system. So, combustion requires fuel, oxygen and heat. But, without any one of the three, combustion cannot occur.
How does an air injection smog pump work?
All we have to do is introduce some oxygen, than any unburned fuel will ignite. So, the air injection smog pump pushes air into the exhaust system, right after the exhaust manifold. Therefore, helping intercept and burn those unburned fuels. Above all, the system is critical to help engines achieve government emissions standards.