French spare parts supplier Valeo has developed an electric turbocharger that completely eliminates turbo lag. This new turbocharger is driven by a motor instead of the exhaust drive.
When the turbine is not required to intervene, its pump wheel will still rotate at ten thousand revolutions per minute, so when the driver suddenly steps on the throttle, the intervention of the turbine is not hesitant and is quite straightforward. The disadvantage of this equipment is its high price and high energy consumption. In addition, the turbine needs 48-volt power system support, which means that additional power electronics are needed. However, despite this, the automaker has shown great interest.
Audi has already begun testing electric turbine technology and is probably the first brand to bring this technology to market. Recently, Audi conducted a test run at the Pike Peak in Colorado, USA. Ulrich Hackenberg, head of research and development at Audi, hinted that there will be a new model interview in 2016, as well as an electric turbine and a conventional exhaust turbine. Thomas Weber, head of research and development at Mercedes-Benz, said that the technology is realistic and may be a good choice when combined with a 48-volt or higher voltage power supply system. He believes that the electric turbine is a strong contender for a two-stage turbocharger.
Two-stage turbochargers use two turbines, one for low speed and the other for high speed. Nikolai Ardey, head of BMW engine development, said that although BMW is also studying the technology, it does not overlook other possibilities. A powertrain expert at General Motors believes the technology is "interesting but needs further study."
Valeo said that electric turbines can reduce fuel consumption by 7 to 20 percentage points. CurtEstes, director of Valeo Powertrain, believes that when the electric turbine is combined with a braking kinetic energy recovery system to recover the kinetic energy and drive the turbine, the fuel economy level can reach 20%. Since GM's 1962 Chevrolet Corvair mass production After the turbocharger, automotive engineers have been improving the technology.
Turbocharging presses more fuel and air into the cylinders and the engine delivers more power. However, the disadvantage of turbocharging is that the exhaust gas of the engine needs to drive the turbine, so the back pressure of the exhaust gas increases and the exhaust gas is not smooth. In addition, there is usually a period of hysteresis between when the driver depresses the throttle and when the turbine accelerates to the operating speed.
Valeo's Estes said that the company's electric turbine pump can accelerate to 70,000 revolutions per minute in just one second, thereby eliminating turbo lag. In addition, it is installed near the intake manifold side of the engine.
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