| 摘要 |
An internal combustion engine system, particularly suitable for a motor vehicle, is provided with an intake manifold, an exhaust manifold and an exhaust gas recirculation rate control system fluidly connected to the exhaust manifold and to the intake manifold. The exhaust gas recirculation rate control system includes at least two critical-flow nozzles, each critical-flow nozzle having an intake end and output end, the intake ends being fluidly coupled to the exhaust manifold; at least one valve, each valve being fluidly coupled with at least one output end; and a control module operatively connected to each valve for controlling exhaust gas flow therethrough. Some advantages of such a system is that the exhaust gas recirculation is accurately provided with an "open-loop" control system, thereby avoiding the use of a feedback system; the flow can be accurately determined under a choked-flow operating conditions; and the system can readily handle different exhaust gas flow rates.
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