| 摘要 |
A supercharged internal combustion engine system wherein the supercharger assembly includes an ejector pump driven by high-pressure air for pumping intake air into engine combustion chamber. The ejector pump uses a supersonic driving nozzle and a diffuser, each of which can be provided either with a fixed throat area or with a variable throat area. The system includes means for sensing engine power demand and controlling the supercharging action. Effective supercharging with fast response to demand is achieved even at low engine speeds. During periods of natural engine aspiration the ejector pump can be by-passed to reduce flow impedance. The invention permits increasing power output from small displacement engines. As a result, acceleration and grade ascent capabilities of automotive vehicles with small displacement engines having good fuel economy is improved. The system can be also operated to reduce engine exhaust emissions during cold engine start.
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