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DieselNet Technology Guide » Diesel Fuel Injection. DieselNet Copyright © ECOpoint Inc. Revision This is a preview of the paper, limited to some initial content. Full access requires DieselNet subscription. Please log in to view the complete version of this paper.
In order for the fuel injection system to fulfill its purpose, fuel must be transferred to it from the fuel tank. This is the role of the low-pressure fuel system components. The low pressure side of the fuel system consists of a number of components including the fuel tank, one or more fuel supply pumps and one or more fuel filters.
Figure 1 illustrates two examples of schematics for low pressure fuel systems, one for a heavy-duty diesel truck and one for a light-duty diesel passenger car [] [], components of good paper.
The fuel tank is a reservoir that holds the fuel supply and helps maintain its temperature at a level below its flash point. The fuel tank also serves as an important means of dissipating heat from the fuel that is returned from the engine [], components of good paper. The fuel tank should be corrosion-resistant and leakproof to pressures of at least 30 kPa. It must also use some means to prevent excessive pressure accumulation such as a vent or a safety valve.
The fuel supply pump, often referred to as the lift pump, is responsible for drawing fuel from the tank and delivering it components of good paper the high pressure pump. Modern day fuel pumps can be electrically or mechanically driven by the engine. Using an electrically driven fuel pump allows the pump to be placed anywhere in the fuel system including inside the fuel tank. Pumps driven by the engine are attached to the engine. Some fuel pumps may be incorporated into units that serve other functions.
For example, so called tandem pumps are units that incorporate a fuel pump and a vacuum pump for the brake booster. Some fuel systems, such as those based on a distributor type pump, incorporate a mechanically driven supply pump and the high pressure pump in one unit.
Fuel pumps are commonly sized to deliver more fuel than is consumed by the engine at any particular operating system. This extra fuel flow can serve a number of important functions including providing extra fuel to help to cool injectors, components of good paper, pumps and other engine components and maintaining a more constant temperature of the fuel in the entire fuel system.
Trouble-free operation of a diesel components of good paper system is possible only with filtered fuel. Fuel filters help reduce damage and premature wear from contaminants by retaining very fine particles and water to prevent them from entering the fuel injection system.
As components of good paper in Figure 1, fuel systems can contain one or more stages of filtration. In many cases, a course screen is also located at the fuel intake located in the fuel tank. Two stage filter system typically uses a primary filter on the inlet side of the fuel transfer pump and a secondary filter on the outlet side, components of good paper. The primary filter is required to remove larger particles.
The secondary filter is required to withstand components of good paper pressures and remove smaller particles that can damage the engine components. One-stage systems remove larger and smaller particles in a single filter. Filters can be a box-type or replacement element design, as shown in Figure 2. The box-type filter is that which can be completely replaced as needed and does not require cleaning. Filters with a replaceable element have to be thoroughly cleaned when replacing elements and care must be taken to avoid any dirt residue that could migrate to the intricate parts of the fuel injection system.
Filters can be constructed of metal or plastic. Micro glass fibres can also be used but because of the risk of migration of small glass fibre pieces broken off components of good paper the main element into critical fuel system components, their use in some applications is avoided []. In the past, components of good paper, pleated paper, packed cotton thread, wood chips, a mixture of packed cotton thread and wood fibres and wound cotton have also been used [].
The degree of filtration required depends on the specific application. In general, when two filters are used in series, the primary filter retains particles down to about 10 - 30 µm, while the secondary filter is capable of retaining particles greater than µm. As fuel systems evolve, clearances and stresses on high pressure components increase and the need for clean fuel becomes event more critical.
Both the capability of fuel filters to keep up with demands for cleaner fuel [] as well as methods quantifying acceptable fuel contamination levels have needed to evolve []. In addition to keeping solid particles out of the fuel supply and injection equipment, water in fuel must also be prevented from entering critical fuel injection system components.
Free water can damage fuel lubricated components in the fuel injection system. Water can also freeze in cold temperature conditions and ice may block small fuel injection system passages thus cutting off the fuel supply to the rest of the fuel injection system.
Water can be removed from the fuel using two common approaches. The incoming fuel can be subject to centrifugal forces that separates the denser water from the fuel. Much better removal efficiencies can be achieved with a filter media that separates water. Figure 3 shows a filter using a combination of media-type and centrifugal approaches. Different water separation media operate under different principles.
Hydrophobic barrier mediasuch as silicone treated cellulose, components of good paper, rejects water and causes it to bead up on the upstream surface.
As the beads become larger, they run down the face of components of good paper element into a cup under the force of gravity. Hydrophilic depth coalescing mediasuch as glass micro-fibre, has a high affinity for water. The water in the fuel associates with the glass fibres and over time as more water enters from the upstream side, massive droplets are formed, components of good paper.
The water moves through the filter with the fuel and on the downstream side, falls out of the fuel flow into a collection cup. Increased use of surface active fuel additives and fuel components such as biodiesel have rendered conventional separating media less effective and filter manufacturers have needed to develop new approaches such as composite media and ultra-high surface area coalescing media [] [] [].
Fuel filters can also contain additional features such as fuel heaters, thermal diverter valves, de-aerators, components of good paper, water-in-fuel sensors, components of good paper, filter change indicators. A fuel preheater components of good paper minimize the accumulation of wax crystals that can form in the fuel as it cools to low temperatures.
Common heating methods components of good paper electric heaters, components of good paper, engine coolant or recirculated fuel. Two approaches that use warm return fuel to heat the incoming fuel are shown in Figure 1. Fuel overflow and leak-off fuel returning to the tank also carries air and fuel vapor. The presence of gaseous substances in the fuel can cause difficulties in starting as well as normal engine operation in high temperature environments.
Therefore, bleeder valves and de-aerators are used to rid the fuel supply of vapors and air to ensure trouble-free engine operation. DieselNet Technology Guide » Diesel Fuel Injection DieselNet Copyright © ECOpoint Inc. Abstract : The fuel injection system can be divided into low-pressure and high-pressure sides.
The low-pressure components include the fuel tank, fuel supply pump and fuel filter. The high-pressure side components include a high pressure pump, accumulator, fuel injector and fuel injector nozzle. Components of good paper number of injection nozzle designs and different actuation methods have been developed for use with different types of fuel injection systems.
PARTS OF A POSITION PAPER-ENGLISH FOR ACADEMIC AND PROFESSIONAL PURPOSES- MODULE 13 PART 1
, time: 21:28Fuel Injection System Components
The low-pressure components include the fuel tank, fuel supply pump and fuel filter. The high-pressure side components include a high pressure pump, accumulator, fuel injector and fuel injector nozzle. A number of injection nozzle designs and different actuation methods have been developed for use with different types of fuel injection systems You'll never succeed in writing a research paper until you stop making dozens of mistakes! It's important to create a proper research paper introduction, use APA research paper format, and perform a huge job! We'll share our tips how to make a winning research essay By getting a good understanding of these components, readers will not only get a more comprehensive of research but also get the skills on how to write a research report. To produce such paper
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