To cope with worldwide environmental problems and fuel economy concerns, turbochargers have become essential technology for diesel engines. The number of variable geometry turbines used for the diesel engines has increased, and compressors require high efficiency and wide flow range to match the turbines. Gasoline engines also require wide range and high efficiency compressors to improve both the performance at low engine speed and the maximum output. The new variable geometry diffuser with vanes that can be expanded and contracted at the diffuser passage was developed for the turbocharger compressor. By this mechanism the compressor achieves both large capacity and high efficiency in the small flow range, and the engine performance at low speed is improved.
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