| 摘要 |
A method and apparatus for providing charge air to the intake manifold of an internal combustion engine at high pressure levels at low engine speeds without compressor surge provides an auxiliary turbocharger which receives a portion of the compressed air produced by a main turbocharger at low exhaust gas flow conditions. The remainder of the compressed air generated by the turbocharger under such low exhaust gas flow conditions is communicated through the compressor section of the auxiliary turbocharger, where the pressure of the compressed air is further increased to a level sufficient to provide charge air at an adequate pressure level to the intake manifold of an internal combustion engine to permit efficient operation of the engine with minimal emissions at low engine speeds. An alternate embodiment of the invention provides a control that directs exhaust gas through the turbine of the auxiliary compressor at high engine speeds, so that the auxiliary compressor at such high engine speeds acts as a sequential compressor, further compressing the compressed air generated by the main turbocharger.
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