| 摘要 |
A novel turbocharger is disclosed that includes a compressor wheel and two turbine wheels all mounted on a common drive shaft. Also included is an auxiliary airflow generator to turn one or both turbine wheels. In normal operation, engine exhaust is used to drive the compressor wheel. The improved turbocharger uses two turbine wheels to drive one compressor wheel on one common drive shaft, which invention is intended to eliminate the turbo lag problem inherent in a single turbine turbocharger. In one embodiment, the auxiliary airflow generator spins the turbine wheel at low engine speeds to overcome the problem of turbo lag. In one embodiment, the airflow generator is a blower fan, which directs air through the turbine. In another embodiment, the airflow generator is a vacuum generator, which impels air through the turbine wheel. The two embodiments may be combined such that the blower and the vacuum generator compliment each other in operation. A microprocessor, with sensors, may be added to monitor the engine and turbocharger conditions to optimize engine speed. A single turbine wheel may be used with the airflow generator and the engine exhaust to drive the compressor wheel. The first and second turbine wheels may be coupled in serial fashion so as to allow the engine exhaust to drive the first turbine wheel and then the second turbine wheel.
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