Danfoss Motor : "The structure of the motor The performance of the motor has a direct impact on the performance of the motor vehicle."
First, fuels are classified into gasoline motors and diesel motors using different types of fuels depending on the motor.
1 Car maintenance and repair, gasoline motor is small in size, light in weight and low in price; when the maximum speed is running, it starts well; the vibration is small during operation and the noise is small, suitable for small and medium-sized cars, especially high-speed cars. Due to the limitation of deflagration, gasoline motors can not have excessive compression ratio, thermal efficiency, and are not as economical as diesel. Gasoline is a mixture of the main gas lines that enter the cylinder and ignites when compressed to a spark plug near the bottom. It is normal for the driver to accelerate the fuel injection into the cylinder to control the load on the motor. The fuel supply system and ignition system of a gasoline motor are a relatively high proportion of gasoline motor failures. Although gasoline motors emit more carbon monoxide, carbon compounds and nitrogen oxides than diesel, the current electronically controlled fuel injection systems and other exhaust gas purification devices have been greatly improved. However, it is greatly improved with the current electronically controlled fuel injection system and other exhaust gas purification devices. In addition, the torque characteristics of the gasoline motor are very suitable for the car, which can greatly reduce the labor intensity of the driver.
2 diesel motor and gasoline motor, diesel motor size, weight, high price, poor start (especially at low temperatures), vibration and noise during operation; black smoke, easy to overload. The characteristics of the diesel motor are:
1) There is no limit to deflagration, but diesel requires self-ignition, so the compression ratio of the diesel motor is very high. Thermal efficiency and economy are better than gasoline motors.
2) Diesel motors are suitable for trucks because of the same power, high torque and maximum power.
3) The inside of the diesel motor cylinder is a mixture, there is no intake throttle, small resistance of the intake pipe. Drivers speed up the use of fuel injection control panels, by changing the motor load, as the quality of regulation, because there is no oxygen deficiency problem, hydrocarbons and carbon monoxide emissions are lower than gasoline.
4) The fuel supply equipment has a low failure rate due to the absence of an ignition system. Therefore, no less than a gasoline motor.
5) The torque characteristics of the diesel motor are not suitable for the driving cycle of the car. The moving booth is often used, which is suitable for the increase of the pilot's labor intensity. Mainly suitable for medium and heavy vehicles.
Second, the motor block and motor block displacement are equal.
Therefore, increasing the number of cylinder motors not only increases capacity, increases motor output, but also enables the motor to operate smoothly to reduce noise and vibration. Hyundai Motor Company has adopted a multi-cylinder motor. Mini-cars over 3 cylinder motors, small trucks, passenger cars and medium-sized motors with more than 4 cylinders; medium-duty trucks, large cars and buses with more than 6-cylinder motors; heavy-duty trucks generally 6-8 cylinders. In the 6-cylinder single-row multi-cylinder mode, the 8-cylinder V-type in-line motor, some cars, to reduce the height of the motor, shorten the length, install the V6 motor, V8 motor type. Mini-cars use 3-cylinder motors, mostly tilted. The inline motor structure is simple and inexpensive. The disadvantage is that the motor is taller and longer. More is a way. The V-type motor has a low height and a short length, but its structure is complicated and the price is more expensive, which is suitable for large motors. The water-cooled motor block is integrally cast. Small motors are made of aluminum alloy, while large motors are mostly made of cast iron. Cylinder head bolts are fixed blocks used on aircraft, except for forming a closed cylinder combustion chamber, entering exhaust pipes, valves and spark plugs.
Third, fuel supply for gasoline motors, fuel supply system vaporizer
The working principle of two main equipments for gasoline motor fuel entering carburetor and fuel injector:
When the motor is operating, outside air is drawn into the air filter and passed through the filter into the cylinder. When the air flows through the pipe portion, the vacuum is caused by a small growth rate and a decrease in pressure. After the gasoline in the vacuum chamber floats from the main inlet to the nozzle, the high-speed gas stream discharged from the gas is dispersed into a mist. The mixture of air in the air passage then enters the cylinder in the form of an evaporation space for the petroleum and petroleum membranes. In order to achieve economical, the main oil is also used for air braking. The main nozzle of the indoor air, and with some opening around the through hole in the same room air. When the throttle opening is gradually increased, the air hole gradually contacts the air. Not only does the vacuum be reduced, the mixture is thinned, and the primary air nozzle also facilitates atomization of the gasoline. 2. Electronically controlled fuel injection fuel supply system The vaporizer fuel supply device has the advantages of simple structure, reliability, low cost and convenient maintenance. But the biggest drawback is that it can't be precisely controlled by the concentration of the mixture, resulting in incomplete combustion, harmful components emitted, and does not meet current environmental requirements. In addition, the air resistance is increased due to the presence of the pipe. In addition, the gasoline in the cylinder is unevenly distributed, which is prone to sputum and ice. In order to solve these problems, 80 electronically controlled fuel injection systems are widely used in automobile motors.
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