How to sort the BMW x5v8 cylinders?

In the next period of time, a large number of luxury medium and large SUVs equipped with four-cylinder 2.0T supercharged power, including Volvo, Audi and BMW, will gradually seize the China market. Volvo, which was listed before, replaced XC90 and T6 models with 2.0T；; The upcoming Audi Q7 has also prepared a newly developed 2.0T engine for the China market, although the detailed performance parameters have not been announced.

At the Chengdu Auto Show in September, BMW also confirmed that it will launch the new BMW X5 xDrive 28i and BMW X6 xDrive 28i, both of which will be equipped with a 2.0-liter TwinPower turbine engine. 2.0-liter displacement, in-line four-cylinder engine, only from the power point of view, small displacement turbocharging seems to be weaker than larger displacement V6?

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But scientifically speaking, from the data point of view, 2.0T Hao does not show weakness. First of all, the performance data of BMW X5 xDrive 28i and BMW X6 xDrive 28i equipped with 2.0-liter TwinPower Turbo are listed here: the acceleration of 0- 100km/h is 7.5 seconds and 7.4 seconds respectively, while the comprehensive fuel consumption per 100 km is only 9.0 liters and 9. 1 liter. For medium and large SUVs with more than 2 tons, this is a quite good result. 2.0T will undoubtedly become the entry standard for more and more luxury SUVs. In this respect, BMW is in the lead.

Look at technology:

The trend of small displacement turbocharging is irreversible, on the one hand, it is caused by strict environmental regulations; On the other hand, squeezing more power from smaller and fewer cylinders is a further embodiment of new automobile technology. BMW's 2.0-liter TwinPower turbine engine is a good example.

The 2.0-liter TwinPower turbine engine, which won the World Engine of the Year Award and Ward's Top Ten Engine Rating respectively, is also equipped with a unique twin scroll turbocharger technology. In a general four-cylinder turbocharged engine, the exhaust gas of four cylinders flows out from four exhaust manifolds in turn and then flows into the same exhaust manifold, and the turbine is arranged at this end of the manifold; On the other hand, BMW's 2.0T engine is divided into two exhaust scrolls. According to the working sequence of cylinder 1-3-4-2, cylinder 1 and cylinder 4 form a pipeline, and cylinder 2 and cylinder 3 form another pipeline. These two pipes are simultaneously introduced into the exhaust turbine. You can say that BMW is a "technical house", deliberately using two scroll tubes, one long and one short, to guide the exhaust gas from four cylinders into the turbine. -For a truly sequential 1-3-4-2 four-cylinder engine, if it is a traditional four-out-one-turbine structure, there will be no small disadvantages. Exhaust gas is collected at the head end of the main pipe in four ways almost at the same time, and the exhaust gas discharged from one cylinder interferes with the three cylinders. Exhaust gas discharged from cylinder 3 interferes with cylinder 4. ...................................................................................................................................................................... thus reduces the exhaust interference between cylinders, and the exhaust pressure is stable and continuous; At the same time, the structure of double scroll also reduces the cross-sectional area of each scroll, thus improving the flow speed of exhaust gas, and finally achieving the purpose of reducing turbine lag and improving supercharging effect.

This double scroll and single turbine structure can quickly establish positive intake pressure after the driver steps on the accelerator pedal. Especially at low speed, the dual-throat single turbine is very agile, and the maximum torque of 350 Nm can be output as low as 1250 rpm, which lasts to 4800 rpm. 1250-4800 rpm, which covers the speed range of daily driving, can almost always output the maximum torque. Of course, 3.0T is stronger, but we no longer have to worry about the dynamic performance of X5/X6 with 2.0T engine. 2.0T is very decent.

Another unique technology of BMW 2.0T engine is VALVETRONIC electronic valve control system and Double-VANOS dual camshaft variable valve timing system. VALVETRONIC system adds eccentric shaft, stepping motor and intermediate push rod to the traditional intake valve mechanism. After a series of mechanical transmissions are driven by the rotation of the motor, the lift of the intake valve is subtly and accurately changed. VALVETRONIC intake valve lift of each cylinder can realize stepless change from 0. 18 mm to 9.90 mm

Double-VANOS is a dual variable timing system of intake/exhaust valve developed by BMW, which can advance or delay the opening or closing time of intake/exhaust valve flexibly and steplessly according to the engine load. The combination of VALVETRONIC electronic valve control system and dual VANOS dual variable valve timing system almost replaced the throttle valve on the traditional engine intake manifold. The engine is still equipped with a throttle, but in most cases, the throttle is fully open, which reduces the pumping loss and fuel consumption by 7%, but the response speed of the throttle is faster. Just like a foreign body stuck in the throat is pulled out, breathing becomes smooth, and work is of course more active.

High-precision direct injection technology can further improve engine efficiency. Piezoelectric ceramic injector is located in the center of the top of the cylinder and directly injects fuel into the cylinder. Compared with intake manifold injection, in-cylinder direct injection can control fuel supply more accurately. The nozzle of this engine is very close to the spark plug, and the maximum injection pressure reaches 200bar( 1bar= 1 atmospheric pressure). Adequate atomization is more conducive to clean and uniform combustion.

Lightweight is also an important indicator of BMW's efficient power. The application of 4-cylinder supercharged engine greatly reduces the kerb quality of BMW X5 and X6 models, and at the same time reduces the vacant space occupied by power plant, thus further reducing energy consumption and emissions. With ECO PRO energy-saving mode, automatic engine start and stop, energy recovery and other technologies, the fuel consumption per 100 kilometers is 9.0 liters and 9. 1 liter respectively.

Do you think luxury medium and large SUVs must be gas tigers? Think 2.0T must be HELLO KITTY? New technology has completely subverted many traditional ideas. Small displacement does not mean that there is no technology, no motivation and no fun. BMW I is an endorsement of BMW's future development direction. A 3-cylinder TwinPower turbogasoline engine with a displacement of only 1.5 liter is combined with a driving motor. The i8 hybrid sports car accelerates from 0- 100km/h to 4.4 seconds, but the comprehensive fuel consumption per 100 km is 2. 1 liter. BMW has taken another step forward in promoting small-displacement engine technology, and the classic driving pleasure has never been compromised.

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