| 摘要 |
<p>Internal combustion engine systems can be provided with enhanced engine performance through two-stage charge air compression and through exhaust gas recirculation in relation to engine load and speed. Improved two-stage charge air compression can be provided with a turbocharger (14) having an exhaust gas turbine (15) and a first stage air compressor (18) driven by the exhaust gas turbine and providing a flow of compressed air at its outlet and a second stage motor-driven compressor (22) having its inlet connected with the flow of compressed air from the turbocharger compressor outlet and its outlet connected with the intake manifold (13) to provide further and highly compressed charge air for the internal combustion engine (11). Improved exhaust gas recirculation can be provided with a two-input proportioning gas control valve (35) connected in a two-stage charge air compression system to mix in controlled proportions a flow of air, which is preferably compressed air from a first stage compressor, and a flow of exhaust gas from the internal combustion engine and to deliver an EGR mixture of exhaust gas and air for compression as charge air for the engine.</p> |
