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    • 8. 发明授权
    • Control device and control method for lean-burn engine
    • 稀燃发动机的控制装置和控制方法
    • US5813386A
    • 1998-09-29
    • US825335
    • 1997-03-28
    • Kojiro OkadaKazuhide TogaiMasaji Ishida
    • Kojiro OkadaKazuhide TogaiMasaji Ishida
    • F02D37/02F02D41/14F02D41/30F02D43/04
    • F02D41/1475F02D37/02F02D41/3011F02D41/1456F02D41/307
    • A control device of a lean-burn engine has an electronic control unit. Upon start of switching from stoichiometric driving to lean driving, the control unit (10) derives, from a map, a target pressure (P0) and a basic opening degree (D0) of an idling speed control valve, serving as an air bypass valve, based on the throttle opening degree (TPS) and the engine rotation speed (Ne) at the start of the switching. The control unit supplies driving pulses (N) of a number corresponding to the basic opening degree (D0) to a stepper motor (32) of the idling speed control valve. Then, the control unit supplies the stepper motor with driving pulses of a number corresponding to an opening degree correction amount (D1) which in turn corresponds to a deviation between the target intake pressure (P0) and an actual intake pressure (PB), to thereby suppress a change in the torque at the time of switching between the rich driving, including the stoichiometric driving, and the lean driving of the lean-burn engine.
    • 稀燃发动机的控制装置具有电子控制单元。 从开始从化学计量驱动切换到稀薄驱动时,控制单元(10)从地图导出作为空气旁通阀的空转速度控制阀的目标压力(P0)和基本开度(D0) ,基于在切换开始时的节气门开度(TPS)和发动机转速(Ne)。 控制单元将与基本开度(D0)相对应的数字的驱动脉冲(N)提供给怠速控制阀的步进电动机(32)。 然后,控制单元向步进电动机提供对应于与目标进气压力(P0)和实际进气压力(PB)之间的偏差相对应的开度修正量(D1)的数量的驱动脉冲, 从而抑制在包括理论空燃比的丰富驾驶与稀薄燃烧发动机的稀薄驱动之间切换时的转矩变化。