Page 360 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

MODULE 18 : Stationary Engine and Sub System

LESSON 121 - 125: Study about PT fuel system, definition,

function, components, function and
working of each component and

advantages and disadvantages of PT

system

Objectives

At the end of this lesson you shall be able to
• study about PT fuel system
• explain advantages and disadvantages of PT system.

Study about PT fuel system. definition, function, components
The PT fuel system, often found in diesel engines, refers to the Pressure-Time fuel injection system. It’s designed
to precisely control the timing and pressure of fuel injection into the combustion chamber. Its function is to optimize
fuel combustion for improved engine performance and efficiency while reducing emissions.

Components typically include a high-pressure fuel pump, fuel injectors, fuel lines, pressure regulators, and
electronic control unit (ECU) for managing injection timing and quantity. This system ensures the right amount of
fuel is injected at the right moment, enhancing engine power, fuel economy, and emissions control.
1 High-pressure fuel pump: This pump pressurizes the fuel to a high level, typically several thousand psi
(pounds per square inch). The high pressure is necessary to atomize the fuel into fine mist for efficient
combustion.
2 Fuel injectors: These are responsible for delivering precise amounts of pressurized fuel directly into the
combustion chamber or intake port. They are controlled by the engine’s electronic control unit (ECU), which
determines the timing and duration of fuel injection based on various engine parameters such as engine
speed, load, and temperature.
3 Fuel lines: These are the conduits through which pressurized fuel travels from the fuel pump to the fuel
injectors. They must be designed to withstand high pressure and be properly insulated to prevent fuel from
vaporizing due to engine heat.
4 Pressure regulators: These components help maintain a consistent pressure in the fuel system, ensuring that
the fuel injectors receive a steady supply of pressurized fuel. They regulate fuel pressure by either bypassing
excess fuel back to the fuel tank or by adjusting the speed of the fuel pump.
5 Electronic Control Unit (ECU): The ECU is the brain of the fuel system. It receives input from various
sensors throughout the engine and calculates the optimal timing and duration of fuel injection. It then sends
signals to the fuel injectors to precisely control the amount and timing of fuel delivery.
Overall, the PT fuel system is a sophisticated mechanism that allows for precise control of fuel delivery, leading
to improved engine performance, fuel efficiency, and reduced emissions....
Function and working of each component and advantages and disadvantages of PTO system
Working: The power take-off (PTO) system works by transferring power from the engine of a vehicle or machine
to an attached auxiliary device. This is typically accomplished through a rotating shaft that connects to the PTO
output on the engine or transmission. When engaged, the PTO shaft transfers rotational power, allowing the
auxiliary device to operate. The engagement of the PTO is usually controlled by a lever or switch inside the
vehicle’s cabin or on the machine itself.

347