What is variable injection timing?
What is variable injection timing?
The Variable Injection Timing (VIT) function of a marine diesel engine comes into play during load dependent adjustment of the combustion pressure. By controlling the injection timing of the fuel in the fuel delivery pump and advancing the fuel pump injection timing, VIT increases the maximum pressure in the engine.
What is IMO Vit?
The VIT part is an automatic function that controls the injection begin depending on the actual engine load and cares for optimum part load fuel consumption. A retarded injection is one of the measures used on Sulzer RTA engines to comply with the International Maritime Organisation (IMO) NOX emission regulations.
What is the purpose of Vit?
The Victorian Institute of Teaching (VIT) is an independent statutory authority for the teaching profession, whose primary function is to regulate members of the teaching profession.
What is the purpose of injection timing?
What Is Injection Timing? Injection timing, also called spill timing, is the moment when diesel fuel enters the cylinder during the combustion phase. When you adjust the timing, you can alter when the engine injects the fuel, therefore changing when combustion occurs.
What is the injection timing?
Start of injection (SOI) or injection timing is the time at which injection of fuel into the combustion chamber begins. It is usually expressed in crank angle degrees (CAD) relative to TDC of the compression stroke.
What is difference between VIT and Super Vit?
Modern engines MAN B & W low speed 2-stroke have large Super VIT mechanism to lower the fuel injection and increases the maximum pressure loads, which optimize fuel consumption. VIT = Variable beginning of injection + Variable ending of injection = Adjustable timing of injection. …
What is the injection timing of diesel engine?
Injection timing, also called spill timing, is the moment when diesel fuel enters the cylinder during the combustion phase. When you adjust the timing, you can alter when the engine injects the fuel, therefore changing when combustion occurs.
How do you check fuel injector timing?
By removing deflector from fuel pump
- Take out deflector on both sides of the fuel pump.
- Put hand torch on one side of pump and mirror on the other side.
- The light from torch will be visible on the mirror.
- Turn the engine so that the unit to be check is toward the TDC of compression (at plunger upstroke)
How do I know if my injection timing is correct?
Turn the engine so that the unit to be checked is toward the TDC of compression stroke (plunger upstroke) so that hair line marking on plunger and pump body are coincided. When hair lines are coincided, stop turning and check the mark on the fly wheel whether timing is correct or not.
What are the common ways to adjust injection timing?
The most common ways to adjust injection timing are programming the ECM, adjusting the fuel injection pump, replacing the camshaft, and replacing the cam followers or gaskets.
What is fuel injection timing?
What is the purpose of variable injection timing?
The injection timing can also be manually adjusted to allow for more efficient combustion of fuels with different ignition qualities. Hence the purpose of VIT on ships are: Improve the specific fuel consumption of the engine. Optimizing the combustion process for different quality fuels.
How does a variable valve timing system work?
Variable Valve Timing (VVT) systems are designed to reduce emissions and maximize engine performance and fuel economy. Variable Valve Timing (VVT) systems utilize oil pressurized solenoids and camshaft phasing sprockets to change the timing of a valve lift event throughout the engine RPM range.
How does the timing system work in a car?
For efficiency’s sake, your car’s engine automatically advances and retards ignition timing according to load and acceleration. At one time, this was done via a vacuum control, physically changing the distributor’s curve, but now the engine’s computer manages timing.
How does a centrifugal timing advance affect engine speed?
Weights and springs inside the distributor rotate and affect the timing advance according to engine speed by altering the angular position of the timing sensor shaft with respect to the actual engine position. This type of timing advance is also referred to as centrifugal timing advance.