What is the composition and working principle of diesel engine fuel supply system?

The fuel supply system consists of a fuel tank, a fuel pump, a fuel buffer, a fuel pressure regulator, a fuel filter, an injector, a temperature-saving timing switch and a cold start valve.

The working principle of the diesel engine fuel supply system is that the fuel mercury is sucked out of the diesel fuel tank and generates a certain pressure, which enters the fuel injection mercury through the diesel filter to remove impurities, and the fuel injection mercury increases the fuel pressure and sends it to the fuel injector through the high-pressure oil pipe.

Function, storage, filtration and delivery of diesel medical records.

The requirements of different working conditions of diesel engine, the oil mist is engraved into the combustion chamber at regular and quantitative pressure, so that it can be quickly mixed and burned with air, and finally, the waste generated is discharged into the atmosphere, and the diesel engine fuel supply system is composed of a fuel supply device, an air supply device, a mixture of gas formation devices, and exhaust gas discharge devices.

The fuel supply system is composed of a fuel tank, a fuel transfer pump, a fuel injection pump, an injector, a fuel injection advancer, a governor, a diesel filter, an oil-water separator, a low-pressure oil pipe, a high-pressure oil pipe and an oil return pipe.

The material supply system is composed of fuel supply device, air supply device, mixture gas forming device, exhaust gas discharge device, etc. It works on the principle that the Su oil pump will swim before the oil tank from the oil tank.

1. The engine is divided into two types: gasoline engine and diesel engineIn addition to the fuel supply, they are not the same, but also the ignition method is different, the gasoline engine is ignited by a spark plug, and the diesel engine is completely compressed by the cylinder block, so naturally their fuel supply is also different.

Second, diesel engine,First of all, the fuel is pumped out of the fuel tank through the fuel pump, and then enters the low-pressure pipe through the fuel filter, and the fuel enters the injector from the low-pressure pipe, and then enters the fuel injector from the high-pressure pipe, and the fuel injector injects the fuel into the cylinder block, and then the body compression ignition is carried out, and the engine starts to work.

3. Gasoline engine,Basically, the principle is the same, the difference is that the process of fuel entering the body is different, in the past, the carburetor atomized the fuel into the cylinder block, and then the spark plug ignited again, now it is all EFI, but basically it is the same, it is all atomized fuel, and then the spark plug ignites.

The function of the fuel supply system of gasoline engine is: according to the requirements of various working conditions of the engine, a certain amount and concentration of combustible mixture is prepared, and it is supplied to the cylinder, so that it can be ignited and burned and expanded to do work when it is near the end of compression. Finally, the supply system should also exhaust the combustion products – the exhaust gases – into the atmosphere.

Fuel supply system consists of: fuel pump, fuel filter, fuel pressure regulator, fuel injector, cold start fuel injection vertical reed, oil pressure pulse attenuator, etc. At present, the fuel supply system of gasoline engine includes: carburetor fuel supply system.

Gasoline injection fuel supply system. Liquefied petroleum gas fuel supply system and other mixed fuel supply systems, etc. The carburetor fuel supply system is the traditional supply system of gasoline engines, which is still widely used, while the use of gasoline injection fuel supply system in gasoline engines has been popularized.

<> diesel engine fuel supply system mainly includes two parts: fuel high-pressure supply system and low-pressure supply system. The structure of the fuel high-pressure supply system is relatively complex, the parts are relatively precise, and the maintenance and adjustment require high skills; For low-voltage systems, it is easier to repair. The maintenance of the fuel supply high-pressure system is mainly the maintenance of the fuel injector, fuel injection pump and governor, and only the fuel supply system works normally to ensure the reliable operation of the diesel engine.

Under normal circumstances, after the car has traveled about 80,000km, the fuel injection pump should be overhauled. The overhaul of the fuel injection pump is usually to treat the fuel injection pump and governor as a whole to repair. The contents of the overhaul include checking whether the working performance of the fuel injection pump meets the working requirements of the diesel engine, troubleshooting and readjusting the fuel injection pump and governor on the test bench.

A common way to check the working performance of a fuel injection pump is to first check the economy and power of the car or engine. For poor performance, it is necessary to remove the fuel injection pump and install it on the test bench to measure the consistency of the plunger's fuel injection volume and fuel injection volume. Comparative tests can also be used instead of formal economic and dynamic tests.

Troubleshooting operations include fault inquiry, disassembly, repair, and reassembly. The adjustment operation includes the adjustment of the fuel injection volume, the speed adjustment of the governor effect, and the adjustment of the fuel supply time of the fuel injection pump. The adjustment of the fuel injection volume includes the adjustment of the rated fuel supply, idle oil supply, oil supply uniformity and smoke limiter.

The speed adjustment of the governor includes the adjustment of the rated speed, the idle speed and the working speed range of the corrector. The adjustment of the fuel supply time of the fuel injection pump includes the adjustment of the pre-stroke and the fuel injection timing, as well as the adjustment of the uniformity of the cam rotation angle.

The function of the diesel engine fuel supply system is to inject the well-atomized clean diesel into the cylinder at a timed, quantitative and constant pressure according to the working sequence of the diesel engine, and form a good combustible mixture with the compressed air and ignite and burn by itself. The diesel engine fuel supply system is composed of a fuel tank, a diesel filter, a fuel pump, a fuel injection pump, an injector and a high and low pressure oil circuit. Small diesel engines generally do not have fuel pumps, but place the fuel tank on the upper part of the diesel engine, and rely on the gravity of diesel fuel to transport oil.

The main structural components include fuel tank, fuel pump, fuel buffer, fuel pressure regulator, fuel filter, fuel injector, temperature saving timing switch, and cold start injector.

Fuel tank, fuel pump, fuel buffer, fuel pressure regulator, etc., the structure is all these, and it will be very easy to use.

Its structure and components are, pressure regulator, fuel filter, fuel buffer, fuel pump, fuel tank, fuel injector.

The main functions of the diesel engine fuel system are:

After a certain amount of diesel fuel is pressurized at the right moment, it is injected into the combustion chamber with the appropriate regularity. The timing and volume of fuel injection are the same for each cylinder and are suitable for the operating conditions of the diesel engine. The injection pressure, the quality of the injection atomization and its distribution in the combustion chamber are adapted to the type of combustion chamber.

In each working cycle, each cylinder is injected once, and the injection sequence is consistent with the cylinder working sequence.

According to the old and old changes of diesel engine load, automatically adjust the circulating fuel supply to ensure the stable operation of the diesel engine, especially to stabilize the idle speed, the fuel supply system is composed of fuel tank, diesel filter, low-pressure oil pipe, fuel pump, fuel injection pump, governor, fuel injector and high-pressure oil pipe. After precipitation and preliminary filtration by the fuel filler filter preliminarily filtered diesel is stored in the fuel tank, the fuel pump sucks the diesel from the fuel tank to the Luhan diesel filter, and most of it enters the fuel injection pump after filtration, and the excess part returns to the fuel pump from the diesel filter, and the diesel pressure is increased in the fuel injection chestnut, and the required oil is supplied according to the different working conditions of the diesel engine, and is sent to the fuel injector through the high-pressure oil pipe, and finally sprayed into a mist into the combustion chamber.

An engine is a machine that converts a certain form of energy into mechanical energy. Its function is to convert the chemical energy of liquid or gas into heat energy after combustion, and then convert the heat energy into mechanical energy through expansion and output power. The power of the car comes from the engine.

The engine is the heart of the car, providing power for the walking of the car, and the power, economy and environmental protection of the car. To put it simply, the engine is an energy conversion mechanism, that is, the thermal energy of gasoline (diesel) is converted into mechanical energy by pushing the piston to work when the combustion gas expands in the sealed cylinder, which is the most basic principle of the engine. All the structure of the engine is for the energy conversion service, although the engine has gone through more than 100 years of history with the car, whether it is in the design, manufacturing, technology or performance, control has been greatly improved, its basic principle is still unchanged, this is a rich creative era, those engine designers, constantly integrate the latest technology with the engine, turn the engine into a complex mechatronics product, so that the engine performance has reached a nearly perfect degree, The world's famous automobile manufacturers will also take the performance of the engine as a competitive highlight, first, the role of the automobile engine.

The automobile engine is a device that provides power for the car, is the heart of the car, and is an energy conversion device, which is used to convert the thermal energy of gasoline (diesel) into mechanical energy by expanding the gas after burning in the sealed cylinder, pushing the piston to do work. According to different power**, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrids.

Second, the classification of automobile engines.

1. According to the working mode of the air intake system, it can be divided into four types: naturally aspirated, turbocharged, mechanically supercharged and double supercharged.

2. According to the piston movement mode, it can be divided into two types: reciprocating piston internal combustion engine and rotary piston engine.

3. According to the cylinder arrangement type, it is divided into in-line engine, V-type engine, W-type engine and horizontally opposed engine.

4. According to the number of cylinders, it can be divided into single-cylinder engine and multi-cylinder engine. Modern automobiles mostly use three-cylinder, four-cylinder, six-cylinder, and eight-cylinder engines.

5. According to different cooling methods, it can be divided into water-cooled engine and air-cooled engine. The water-cooled engine cools evenly, works reliably, and has a good cooling effect, and is widely used in modern automotive engines.

6. According to the number of strokes, it can be divided into four-stroke internal combustion engine and two-stroke internal combustion engine. Four-stroke internal combustion engines are widely used in automobile engines.

7. Classified according to the way of fuel: carburetor engine and EFI engine and in-cylinder direct injection engine.

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1. The task of the gasoline engine fuel supply system is to prepare a certain amount and concentration of combustible mixture according to the requirements of various unbelieving conditions of the engine, and supply it to the cylinder, so that it can be burned and expanded at the end of compression, and finally the supply system should also discharge the combustion product - exhaust gas into the atmosphere.

2. The fuel supply system is composed of fuel tank, oil pipe, fuel pump, fuel filter, air filter, fuel pressure regulator, fuel injector, cold start injector, oil pressure pulse attenuator, intake pipe, exhaust pipe, etc.

3. Gasoline supply device fuel tank, gasoline pump, oil pipe, gasoline filter, fuel pressure regulator.

4. The air supply device is an air filter and an air intake muffler on the car.

5. The combustible mixture forming device is carburetor and injector.

6. The combustible mixture gas supply and exhaust gas discharge device are intake pipe, exhaust pipe and exhaust muffler.