See how Audi solves the problem of electric turbocharger

See how Audi solves the problem of electric turbocharger The hysteresis of the dynamic response due to the turbocharged system is a problem that the turbocharger has not been able to properly solve. The electric turbine solution has always been the research focus of major automakers. At the Paris Motor Show, Audi took the lead in demonstrating their solutions.

The technology of electric turbine is based on a V6 TDI diesel engine. This is a new attempt. It has guiding significance for the development of electric turbine technology in gasoline engines. Therefore, we are very interested in this engine. It is said to be interested in electric turbines. This is not the kind of gadgets sold online.

A complete set of booster system can be divided into two parts, that is, an electric turbocharger to provide the boosting effect for the intake of the engine and an exhaust gas-driven turbocharger to provide the boosting effect for the intake of the engine. Therefore, It can also be understood that for two different operating conditions, engineers have designed two solutions. Obviously, the critical point of distinguishing the two solutions is the moment that exhaust gas-driven turbochargers begin to exert force.

● The electric turbine cooperates with the exhaust gas turbine, and the bypass valve is responsible for switching the intake line.

Although this set of booster systems has two booster methods, there is still a close relationship between them. Looking at the direction of the intake, the former part of the intercooler is shared by both, that is, Even when an electric turbocharger is operating in a low engine speed range, the air sucked into the intake pipe still enters from the only air filter through the exhaust gas-driven turbocharger (at this stage, it is driven by exhaust gas. The turbocharger is still in operation, but it is not yet fully pressurized.) Here, the inhaled air is exchanged with the hot turbocharger, according to the physical characteristics of the air, the unit The volume of air in the volume will decrease as the temperature increases. If the air in this state is fed into the cylinder, this is obviously not conducive to the combustion of the air-fuel mixture in the cylinder. Therefore, the intercooler will still play an important role in the operating conditions of the electric turbocharger. The amount of air intake is detected by real-time monitoring of the air intake pressure sensor installed behind the electric turbine and transmitted to the engine computer for analysis. After that, the engine computer then adjusts the speed of the electric turbine to correct Boost value.

When the engine speed climbs high enough to make the turbocharger mounted on the exhaust system function, the bypass valve located behind the intercooler will open, and the air boosted by the exhaust turbocharger will follow the thicker one. The intake line arrives at the throttle, and the process of boosting and intake is the same as that of an ordinary turbocharged engine.

The service of this technology will take time, according to foreign media reports, the application of the engine technology is likely to be the first to be applied in the future MLB vertical engine modular platform models.

● Can the addition of electric turbines completely improve the hysteresis of turbocharged engines?

From a structural point of view, the cooperation of the electric turbine and the exhaust gas turbine can further improve the turbocharged engine's dynamic response at low speeds, but at the instant of the exhaust gas turbine, it will not be as sudden as the ordinary turbocharger. It depends on whether the connection between the electric turbine and the exhaust gas turbine is smooth. Just like relay races in track and field competitions, the athletes who are ready to take the game will start first. When he receives the baton from his teammates, he has already entered the competitive state. If these two people do not converge well in terms of speed, then The results are bound to have an effect. We compared the electric turbine to a player who has already finished the race. At this time, he was tired after completing the final sprint, and the exhausted exhaust-driven turbine was immediately taken over.

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