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Reshaping classics: retro reciprocating engine rejuvenating in today's automotive world,UEFA live free we have become accustomed to using the unitized balance ignition form of reciprocating engines for a hundred years, among which the American Wrigh Company T once used a principle similar to a reciprocating engine to drive aircraft. However, in the field of modern automobiles, with the continuous improvement of the level of internal combustion engines, reciprocating engines have gradually disappeared.However, with the spread of the concept of environmental protection and energy saving, the once classic reciprocating engine has been revived. Reciprocating engines first appeared in the late 18th century, and the original engines consisted of only a single external combustion mechanism. The basic working principle of this engine is that the external power source generates steam or air to produce the reciprocating movement of the piston. However, this type of engine is inefficient and easy to wear out. The real breakthrough of the reciprocating engine was the car invented by French engineer Nicholas Joseph Cugnot in 1769, which used two reciprocating engines with pistons to drive the front wheels. This achievement has laid the foundation for the development of automobiles and promoted the development of this engine form. Reciprocating engines can adopt both internal combustion engines and external combustion engines, and internal combustion engines are divided into gasoline engines and diesel engines.The advantage of the internal combustion reciprocating engine is that it can use multiple cylinders to make its power output stronger at low speeds. This kind of engine is mainly composed of high-pressure cylinders and low-pressure cylinders, each of which is used for different working processes. The high-pressure cylinder is used to compress the mixed gas, and the low-pressure cylinder is used to discharge the exhaust gas. The internal combustion reciprocating engine can also generate rotational power from the tires of the driving bridge by injecting fuel into the combustion chamber. The external combustion engine usually uses steam to push the piston, which is also the realization method of early cars. Although reciprocating engines have been widely used in the industrial field, with the rapid development of modern engine technology, the fuel efficiency and exhaust emission effect of reciprocating engines are gradually deteriorating, and they are gradually replaced by more efficient and environmentally friendly in-line engines, and almost lost in the automotive field. The status of application.However, with the continuous promotion of the energy-saving and environmental protection concept of low-emission, low-fuel consumption and low-carbon in recent years, the reciprocating engine, which tends to be simplified, has once again been paid attention to by people. For example, Japan's Sumitomo Heavy Industries Company released a simplified high-pressure ratio-modified reciprocating engine in 2016, which can effectively balance the problems of power and fuel consumption, achieving higher efficiency than traditional vertical in-line engines. At the same time, it also means that under strict exhaust emission control, reciprocating The motivation can also meet the modern environmental protection requirements. With the continuous progress of environmental protection technology, the once classic reciprocating engine has once again given a new life. In addition to the relatively small number of pieces, the advantage of today's reciprocating engines is also that they perform multiple tasks. Through advanced technologies, such as lightDirect injection and balanced ratio adjustment can save fuel and reduce pollution without sacrificing power and efficiency. As a classic engine form in the global automobile market, reciprocating engines will be more widely used in environmental protection after modernization and improvement, and become an important part of environmentally friendly and energy-saving cars in the future.

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