EY20+F+C Pin type Japanese

Features

The advantages of diesel engine are high torque and good economic performance. The working process of diesel engine is similar to that of gasoline engine. Each working cycle also experiences four strokes of intake, compression, work and exhaust. But because the fuel used in diesel engine is diesel, its viscosity is higher than that of gasoline, so it is not easy to evaporate, and its spontaneous combustion temperature is lower than that of gasoline. Therefore, the formation of combustible mixture and ignition mode are different from those of gasoline engine. The main difference is that the mixture in the cylinder of a diesel engine is compression ignition rather than ignition. When the diesel engine is working, air enters the cylinder. When the air in the cylinder is compressed to the end point, the temperature can reach 500-700 ℃, and the pressure can reach 40 & mdash; 50 atmospheres. When the piston is close to TDC, the fuel injection nozzle of the fuel supply system injects fuel into the cylinder combustion chamber in a very short time with extremely high pressure. The diesel oil forms fine oil particles and mixes with high-pressure and high-temperature air. The combustible mixture burns by itself and expands violently to generate explosive force to push the piston down to work. At this time, the temperature can reach 1900-2000 ℃, and the pressure can reach 60-100 atmospheres The torque is very large, so the diesel engine is widely used in large diesel equipment.

The characteristics of traditional diesel engine are better in heat efficiency and economy. The diesel engine uses compressed air to raise the air temperature, so that the air temperature exceeds the spontaneous combustion point of diesel oil. At the same time, diesel and diesel spray are mixed with air to ignite and ignite. Therefore, the diesel engine does not need an ignition system. At the same time, the fuel supply system of diesel engine is relatively simple, so the reliability of diesel engine is better than that of gasoline engine. The compression ratio of diesel engine is very high because it is not limited by deflagration and the need of diesel spontaneous combustion. The thermal efficiency and economy of diesel engine are better than that of gasoline engine. At the same time, under the same power, the torque of diesel engine is large and the speed of maximum power is low, which is suitable for truck.

How it works

In fact, the working process of diesel engine is the same as that of gasoline engine, and each working cycle also experiences four strokes of intake, compression, work and exhaust. Diesel engine in intake stroke

The inhalation is pure air. When the compression stroke is near the end, the oil pressure is increased to more than 10 MPa by the fuel injection pump. The diesel oil is injected into the cylinder through the fuel injector, and then mixed with the compressed high-temperature air in a short time to form a combustible mixture. Due to the high compression ratio of diesel engine (usually 16-22), the air pressure in the cylinder can reach 3.5-4.5mpa at the end of compression, and the temperature can reach 750-1000k (while the mixture pressure of gasoline engine will be 0.6-1.2mpa, and the temperature can reach 600-700k), which greatly exceeds the spontaneous combustion temperature of diesel. Therefore, diesel fuel will ignite and burn automatically after mixing with air in a short period of time after it is injected into the cylinder. The air pressure in the cylinder rises rapidly to 6-9mpa and the temperature rises to 2000-2500k. Driven by high pressure gas, the piston moves downward and drives the crankshaft to rotate to work. The exhaust gas is also discharged into the atmosphere through the exhaust pipe.

The fuel supply system of ordinary diesel engine is driven by engine camshaft, and the diesel oil is delivered to the fuel chambers of each cylinder by means of high-pressure oil pump. This mode of fuel supply changes with the change of engine speed, so it can not achieve the best fuel supply under various speeds.

The common rail injection fuel supply system is composed of high-pressure oil pump, common oil supply pipe, injector, electronic control unit (ECU) and some pipeline pressure sensors. Each injector in the system is connected with the common oil supply pipe through its own high-pressure oil pipe, and the common oil supply pipe plays a role of hydraulic pressure storage for the injector. During operation, the high-pressure oil pump delivers the fuel to the common oil supply pipe with high pressure. The high-pressure oil pump, pressure sensor and ECU work in a closed-loop manner, which can accurately control the oil pressure in the common oil supply pipe, and completely change the phenomenon that the fuel supply pressure changes with the engine speed. Its main characteristics are as follows:

1. Fuel injection timing and fuel metering are completely separated, and injection pressure and injection process are timely controlled by ECU

2. Fuel injection pressure, injection start point and duration can be adjusted according to the working condition of engine, so as to seek the best control point of fuel injection

3. High injection pressure and pre injection of diesel can be realized.

Advantages

The advantages of diesel engine are high torque and good economic performance. Each working cycle of diesel engine also experiences four strokes: intake, compression, work and exhaust. But because the fuel used in diesel engine is diesel, its viscosity is higher than that of gasoline, which is not easy to evaporate, and its spontaneous combustion temperature is lower than that of gasoline, so the formation of combustible mixture and ignition mode are different from those of gasoline engine. The main difference is that the mixture in the diesel engine cylinder is compression ignition, not ignition. When the diesel engine is working, air enters the cylinder. When the air in the cylinder is compressed to the end point, the temperature can reach 500-700 ℃, and the pressure can reach 40 & mdash; 50 atmospheres. When the piston is close to TDC, the high-pressure pump on the engine injects diesel into the cylinder at high pressure. The diesel oil forms fine oil particles and mixes with high-pressure and high-temperature air. The diesel mixture burns by itself, expands violently and generates explosive force to push the piston down to work. At this time, the temperature can reach 1900-2000 ℃, and the pressure can reach 60-100 atmospheres. The torque generated is very large, so the diesel engine generates diesel Motivation is widely used in large diesel vehicles.