BMW 7 Series - The Most Powerful Six-Cylinder Diesel Engine In The World
|   Thursday, May 26, 2016
A wide range of innovations emphasizes the new BMW 7 Series luxury sedan. The variety of new facilities includes Carbon Core bodywork structure and BMW eDrive technology, up to controlling the car through gestures, and remote parking (Remote Control Parking).

Now, a new face is added to the group. The most powerful six-cylinder diesel engine in the world makes its debut on the BMW 750d xDrive and BMW 750Ld xDrive (combined average fuel consumption 5.
to 5.7 l / 100 km, CO2 emissions of 154 - 149 g / km), versions available with standard all-wheel drive. The new engine generates a maximum power of 294 kW / 400 hp and a maximum torque of 760 Nm.

The new 3.0-liter engine with six in-line cylinders was developed based on the latest generation of engines from the BMW Group. BMW TwinPower Turbo technology includes charged engines in several stages, with four turbochargers and direct common-rail injection, which in the last update generates a maximum power of 2,500 bar. This architecture and other technological features enable significant improvements in power delivery, traction power and efficiency of the current engine.

The BMW 750d xDrive accelerates from 0 to 100 km / h in 4.6 seconds (BMW 750Ld xDrive: 4.7 seconds) - an improvement of 0.3 seconds compared to its predecessor. Much of the credit for this achievement is due to the new forms of multistage charged engines, which now brings together four turbochargers instead of three so far. These allow the boost pressure to be increased much faster at low revs and thus achieve very fast acceleration times in idling mode.

Specifically, the engine has a torque of 450 Nm at only 1000 rpm, while the maximum level of 760 Nm is available between 2000 and 3000 rpm. The BMW 750d xDrive and BMW 750Ld xDrive have a maximum speed electronically limited to 250 km / h. The performance achieved represent a new record for power –displacement and torque- displacement ratios for a series diesel engine.

To a large extent, the efficiency and performance characteristics of the new engine are determined by the first ever use of a fourth turbocharger and, above all, the precisely coordinated interaction of all components in supercharging system.

In general, the two low pressure turbochargers and one of the two high-pressure turbochargers works permanently. Only with the sudden acceleration from an idle state will the two low pressure turbochargers be avoided through a control system of the flap exhaust. This allows the boost pressure to increase even faster, ensuring a prompt response. The second high-pressure turbocharger comes into action at a rev range of approximately 2,500 rpm.
Another feature that is not present in the current engine is exhaust gas recirculation for the low-pressure stage of supercharging, as well as for the high-pressure stage. This means increased turbochargers efficiency, and thus the engine as a whole is more efficient.

In this way, emissions of nitrogen oxides levels under high loads are reduced. To improve efficiency, the engine uses an indirect system of charge air cooling, with a larger capacity than that used by the current engine and additional cooling for the plate behind the low pressure turbo compressor.
The key to the latter is a separate low-temperature circuit - independent of the engine cooling system - which includes thermal controllers and pump cooling with an electric actuator.
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