| 摘要 |
<p>A turbocharged internal combustion engine comprises an air inlet; an exhaust gas outlet; a turbocharger having a turbine gas inlet, a variable turbine, a compressor and a gas outlet from the compressor; and further comprising a bypass valve interposed between the engine exhaust gas outlet and the turbine inlet. This engine is preferably operated by reducing the effective area of the variable turbine while the bypass valve is kept closed, monitoring the outlet air pressure from the compressor or the turbocharger speed, detecting when one of these parameters reaches a predetermined value and then opening the bypass valve while keeping the variable turbine in the closed position until the predetermined values are re-achieved. This arrangement is particularly useful to improve engine braking and improve exhaust gas recirculation.</p> |
