As for the significance of this engine, a word from Wei Chai engineer is in place:
Although in the eyes of many people, diesel engines are still "stupid", in fact, diesel engines are not inferior to gasoline engines in terms of structural complexity or electronic control system complexity. Therefore, Wei Chai WP 13H diesel engine is the representative of domestic internal combustion engine strength. Then the question is, what advanced technologies have been adopted in this engine to achieve ultra-high thermal efficiency? Can our passenger cars achieve such high thermal efficiency in the future? Now, let's talk to you.
The piston reciprocating engine has been born for a hundred years, and the overall structure has not changed much. In the past 50 years, the thermal efficiency of top engines has increased by less than 10%, but even so, Wei Chai has saved a lot of thermal efficiency of diesel engines. Generally speaking, Wei Chai has used five patented technologies to "save" thermal efficiency-coordinated combustion technology, coordinated design technology, exhaust energy distribution technology, partitioned lubrication technology and intelligent control technology.
So many things, most people are confused when they see them, like this! I try to tell you these things in a popular way:
Mixed combustion technology;
Ignition is an art, and the natural thermal efficiency of diesel engine is higher than that of gasoline engine. This is because compared with spark plug ignition of gasoline engine, diesel engine adopts compression ignition type, which has the advantages of high combustion temperature and full fuel combustion. At the same time, the faster the same amount of fuel burns, the stronger the energy. In order to improve the combustion speed, it is necessary to analyze various parameters such as intake flow rate, concentration of oil-gas mixture and flame shape of combustion chamber by computer modeling, and continuously improve the combustion effect by optimizing the design of air duct, fuel injection and combustion chamber. On the diesel engine in Wei Chai, engineers succeeded in increasing the burning rate by 30%.
Coordinated design technology:
The explosive power of combustion is strong, and the structural strength of the engine needs to be strengthened, but the mass distribution of the engine is exquisite. It is necessary to strengthen some areas while weakening the strength of some areas, but this weakening must be based on not affecting the overall strength of the engine and optimizing the mass distribution of the engine.
Diesel engine disassembly, the picture is for illustration only.
Exhaust energy distribution technology;
Turbocharging technology is essentially a technology to "extract" thermal efficiency from exhaust gas. In order to further improve the thermal efficiency, the engine must extract some energy from the exhaust gas. Wei Chai has improved the efficiency of turbine through the design of exhaust system, and extracted 65,438+0% thermal efficiency from exhaust gas.
Sectional lubrication technology:
Similarly, the friction of mechanical parts will also consume power. The new engine adopts different anti-friction technologies in different areas, which reduces the overall friction by 20%.
Intelligent control technology:
Finally, the fuel injection, gas distribution, turbine, oil pump, water pump and various sensors of the engine are controlled by ECU. The stronger the calculation ability of ECU, the higher the control accuracy of engine. For example, the high-pressure rail of Bosch diesel engine can inject fuel 9 times in nearly 1 millisecond, and the fuel injection signal of the fuel injector is provided by ECU, which requires extremely high operation speed of ECU. Chai Weixin diesel engine adopts self-developed electronic control unit.
In fact, what we feel most from Wei Chai engines is that many China manufacturers have shifted from imitating and absorbing foreign technology to developing. On the premise of thoroughly understanding the principle of engine technology, combined with computer aided design, electronic control technology, software and hardware technology, the products were iteratively upgraded, which made the research and development of domestic internal combustion engines move towards the fast lane.
This change also occurs in the gasoline engine of passenger cars. For example, the thermal efficiency of BYD Xiaoyun-plug-in 1.5L high-efficiency engine is as high as 43%, while the indicated thermal efficiency of the new generation hybrid powertrain platform being developed by Geely will reach 49.5%.
Write it at the end
In the foreseeable future, with the continuous promotion of energy conservation and emission reduction, hybrid platforms will be widely used, and the adoption of hybrid platforms will further release the space for improving the thermal efficiency of engines. Not surprisingly, there will be more and more star products of domestic engines in the next few years.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.