| 摘要 |
A turbo supercharging system for an internal-combustion engine having controllable plural charge air compressors wherein the charge air compressors are in a permanent driving connection with an exhaust gas turbine during all operating times of the internal-combustion engine. The control of charging air is by switching the flow through the compressors; wherein at engine idle, flow is through a low capacity compressor and a high capacity compressor, exhausts to atmosphere; wherein at an intermediate partial load condition where flow is through the high capacity compressor and the low capacity compressor exhausts to atmosphere; wherein at a full load condition the compressors are serially connected together to feed the internal-combustion engine.
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