As a leader in the non-road engine industry, Caterpillar has begun to launch engines that meet the fourth stage in recent years. Today I want to introduce to you the engine of the 349F excavator C13. I believe that many maintenance personnel have seen this engine, and today we will introduce the engine’s fuel system in detail.
Fuel system layout
First, I present the system layout diagram of the engine fuel system as follows:
The electronically controlled pump nozzle fuel system has six main components:
Low pressure fuel oil circuit
The low pressure fuel system has four basic functions:
The low pressure fuel system includes the following main components:
Electronic control device
The engine control part includes the following components:
The features in the following list are part of the electronic control system:
These characteristics can have the following effects:
ECM consists of the following two main components:
The working condition diagram determines the following characteristics of the engine:
ECM determines the ideal speed based on the following criteria:
Electronically controlled pump nozzle mechanism
(28) Double valve electric control pump nozzle
(29) Adjusting nut
(30) Rocker arm assembly
The electronically controlled pump nozzle (28) pressurizes the fuel. Then, the correct amount of fuel is injected into the cylinder at the precise moment. ECM can determine the timing of fuel injection and the amount of fuel injected into the cylinder. The nozzle of the electronically controlled pump is operated by a camshaft cam and a rocker arm. There are three camshaft cams on the camshaft for each cylinder. Among them, two cams manipulate the intake and exhaust valves, and the other cam manipulates the unit injector mechanism. The thrust is sent from the pump nozzle cam on the camshaft (32) to the push rod (31) through the tappet. The thrust of the push rod is sent to the top of the pump nozzle through the rocker arm assembly (30). The transmitted thrust pushes down the plunger in the top of the injector. The movement of the plunger injects fuel into the cylinder. The adjusting nut (29) is used to adjust the nozzle of the electronically controlled pump.
Double valve electric control pump nozzle
Injection timing and fuel delivery
The above is the content shared today. If you need a product, you can also find it on the official website or the mall linked below. Your attention is the biggest motivation for my creation, thank you.