Don’t listen to the fool to interpret the new mercedes benz c M254 engine.
★ Coating of Mercedes NANOSLIDE Cylinder and Honing Process of CONICSHAPE Cylinder
It is reported that compared with the traditional cylinder liner, the patented technology of Mercedes-Benz can reduce the friction loss of the cylinder by about 50%, the heat can be conducted to the cooling system more quickly, the compression ratio can be set higher, and the engine oil with lower viscosity can be used.
At the same time, the small holes on the surface can’t store the engine oil normally. After the engine oil is brought into the combustion chamber by the piston, the carbon deposition will become more and more serious, and the price of future maintenance is much higher than that of engines using cylinder liners.
★ CAMTRONIC variable valve lift and piezoelectric injector
Among them, the intake valve can be opened in the crank angle range of 4 before TDC to 36 after TDC, and the exhaust valve can be closed in the crank angle range of 25 before TDC to 15 after TDC. This adjustment method can make the valve overlap angle change in a wider range, thus obtaining more economical ignition timing.
On the one hand, the adjustable valve lift can ensure the best combustion effect by combining multiple fuel injections with multiple ignition of spark plugs (generally 5 times), and can also make up for the reduced turbulence of combustible mixed gas in the combustion chamber.
However, multiple ignition will greatly shorten the life of spark plugs, that is to say, in the current generation (|), the life of spark plugs is about one-fifth of that of ordinary single-ignition engines.
★ New turbine technology
In the brand-new engine, the 2.0T version will add an electric turbocharger on the basis of the exhaust gas turbine, that is, the configuration of double turbines. It is reported that the C300 model will be equipped with this engine.
The electric turbine is equipped with a brushless DC motor, which has the ability to increase the speed to 7000 rpm in 0.3 seconds. The turbo lag phenomenon can almost be avoided, but according to foreign media, the energy consumption of this electric turbocharger is still relatively large.
The electric exhaust gas turbine is connected with the engine cooling circuit, and the maximum speed can reach 170,000 rpm, which can achieve a very high airflow speed and keep the boost pressure for a period of time. Even if the driver has started braking, he can respond quickly when power is needed.
★ Full text summary
The fully optimized M254 1.5T+48V light-mixed engine, with the blessing of the above advanced technologies, is a completely new change compared with the previous generation models, and finally returns to the same starting line as BMW and Audi’s 2.0T, and the strategies of electrification and energy saving and emission reduction are equally significant to enterprises. However, from the consumer’s point of view, the nightmare of M264 is not far away, and the brand-new M254 is bound to make consumers pay more attention to it, just as the brand-new C-class has exposed problems such as central control screen, driver assistance system failure and passive safety system failure, which inevitably makes people sigh that things are good things, but it still has a long way to go to make consumers accept them. (Image from the network text/car home Zheng Chen)