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    • 6. 发明公开
    • Air/fuel ratio controller and control method
    • Steuerung des Luft-Kraftstoff-Verhältnissesund Steuerungsverfahren
    • EP2599985A1
    • 2013-06-05
    • EP11191364.6
    • 2011-11-30
    • Hoerbiger Kompressortechnik Holding GmbH
    • Andersson, Ingemar
    • F02D41/14
    • F02D41/1461F02D41/1402F02D41/1441F02D41/1463F02D41/1479
    • For combustion engines with a three way catalyst it is necessary to implement an air/fuel ratio control to keep the air/fuel ration within a rather narrow range for best catalyst efficiency. The present invention describes an air/fuel ratio controller (6) and a method that uses an upstream control loop to maintain a given optimum air/fuel ratio (λ opt ), whereas the optimum air/fuel ratio (λ opt ) is determined in the controller (6) in an downstream control loop by adding incremental offset (Δλ) to the air/fuel ratio set-point (λ SP ) of an upstream control loop whilst monitoring a NOx sensor (10) output. The air/fuel ratio set-points (λ SP ) at two turning points (SP1, SP2) in the NOx sensor (10) output are used to calculate a new optimum air/fuel ratio set-point (λ opt ) as mean value of the air/fuel ratio set-points (λ SP1 , λ SP2 ) at the turning points (SP1, SP2).
    • 对于具有三元催化剂的内燃机,需要实施空/燃比控制以将空气/燃料比保持在相当窄的范围内以获得最佳的催化剂效率。 本发明描述了空/燃比控制器(6)和使用上游控制回路来维持给定的最佳空气/燃料比(»opt)的方法,而最佳空气/燃料比(»opt)在 控制器(6)通过在监视NOx传感器(10)输出的同时向上游控制回路的空气/燃料比设定点(“SP”)增加增量偏移量(“»”)来控制下游控制回路。 使用NOx传感器(10)输出中的两个转折点(SP1,SP2)的空燃比设定点(“SP”)来计算新的最佳空燃比设定值(»opt)作为平均值 (SP1,SP2)上的空燃比设定点(»SP1,»SP2)。