Methods and systems for electric turbocharger

Abstract

Methods and systems are provided for an electric turbocharger. In one example, a method rotating a turbine of the electric turbocharger in a reverse direction, the turbine being mechanically coupled to a compressor via a shaft. The rotation of the turbine may be adjusted based on a cold-start and / or engine operating conditions outside of the cold-start.

Description

technical field [0001] This specification generally relates to the use of an electric turbocharger to regulate intake passage pressure and exhaust passage pressure. Background technique [0002] Reducing tailpipe emissions may be a common goal among manufacturers in the automotive industry. As emission standards continue to increase, technology may continue to improve to meet the standards. Exhaust emissions based on current standards may need to be reduced to meet future regulatory requirements. Previous approaches to reducing cold-start emissions have included developing catalysts that heat up and light off quickly at lower temperatures, and optimizing engine cold-start conditions to transfer heat to the catalyst as quickly as possible. However, even with a quick catalyst light-off, there is still a period during cold starts where the catalyst is not hot enough to convert emissions. [0003] Some methods utilize electric heaters to directly heat the catalyst. However, ...

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Problems solved by technology

As an example, such valves increase packaging constraints and can be difficult to install due to the compact packaging of modern engine systems

Also, such a valve may not serve a function other than increasing exhaust back pressure

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