公开(公告)号：US06725848B2

公开(公告)日：2004-04-27

申请号：US10052013

申请日：2002-01-18

申请人： Ravishankar Ramamurthy ,  Sameer Bhargara ,  Phillip F. Rimnac

发明人： Ravishankar Ramamurthy ,  Sameer Bhargara ,  Phillip F. Rimnac

IPC分类号： F02M2507

CPC分类号： F02D41/005 ,  F02B29/0425 ,  F02D2200/0418 ,  F02M26/05 ,  F02M26/10 ,  F02M26/16 ,  F02M26/28 ,  F02M26/33 ,  F02M26/47 ,  F02M26/50 ,  Y02T10/47

摘要： An exhaust gas recirculation system for a compression ignition engine is provided wherein the exhaust gas recirculation is shut off depending upon the sensed or calculated humidity in the intake manifold relative to the dew point of the exhaust/intake air mixture. The humidity of the exhaust/intake air mixture may be measured in the intake manifold, charge air mixer or the ambient humidity may be sensed. If humidity is measured in the air charge mixer or in the ambient air, other factors such as engine speed and load, intake manifold pressure, EGR flow and air/fuel ratio may be used to calculate the humidity in the intake manifold. When the temperature of the mixture in the intake manifold is less than the dew point of the mixture, the engine control strategy may be shut off the EGR to prevent condensation in the exhaust gas recirculation system or engine.

摘要翻译： 提供了一种用于压缩点火发动机的废气再循环系统，其中废气再循环根据进气歧管中感测或计算的湿度相对于排气/进气混合物的露点而被切断。 排气/进气混合物的湿度可以在进气歧管中测量，可以感测加气空气混合器或环境湿度。 如果在空气充气混合器或环境空气中测量湿度，则可以使用诸如发动机转速和负载，进气歧管压力，EGR流量和空气/燃料比等其他因素来计算进气歧管中的湿度。 当进气歧管中的混合物的温度低于混合物的露点时，发动机控制策略可以关闭EGR以防止废气再循环系统或发动机中的冷凝。