公开(公告)号：WO1998038416A1

公开(公告)日：1998-09-03

申请号：PCT/US1997023179

申请日：1997-12-04

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  BUSH, Kevin, J. ,  CHURCH, Bruce, A. ,  FRANKOWSKI, David ,  SCHUMACHER, Darren, A. ,  BADALAMENT, Michael

IPC: F01N03/00

CPC classification number: F02D41/0295 ,  F01N11/007 ,  F01N2550/02 ,  F01N2900/0422 ,  F02D41/1441 ,  F02D41/1475 ,  F02D2200/0814 ,  Y02T10/47

Abstract: The catalyst control method of the invention continuously estimates a level of oxygen stored by a catalyst within a catalytic converter. The estimated oxygen stored by the catalyst is compared to a predetermined threshold and positive or negative deviations in the oxygen amount from the threshold is determined. When a positive deviation from the threshold amount is detected, the air/fuel ratio flowing into an engine (16) is decreased. Correspondingly, when a negative deviation is detected, the air/fuel ratio flowing into the engine (16) is increased. The amount of oxygen stored by the catalyst is determined by analyzing signals from a first gas sensor (28) positioned upstream from a catalytic converter (34) and a second gas sensor (30) positioned downstream from the catalytic converter (34). An engine control unit (10) integrates an expression for the mass flow rate of excess oxygen into the catalytic converter (34). Engine control unit (10) applies a change in air/fuel ratio to maintain the oxygen level on the catalyst within the catalytic converter (34) at a desired level.

Abstract translation: 本发明的催化剂控制方法连续地估计催化转化器内的催化剂储存的氧含量。 将由催化剂储存的估计氧气与预定阈值进行比较，并确定氧气量与阈值的正或负偏差。 当检测到与阈值量的正偏差时，流入发动机（16）的空气/燃料比减少。 相应地，当检测到负偏差时，流入发动机（16）的空气/燃料比增加。 通过分析来自位于催化转化器（34）上游的第一气体传感器（28）和位于催化转化器（34）下游的第二气体传感器（30）的信号来确定催化剂存储的氧气的量。 发动机控制单元（10）将过量氧气的质量流量的表达式整合到催化转化器（34）中。 发动机控制单元（10）应用空燃比的变化，以将催化转化器（34）内的催化剂上的氧气水平维持在期望的水平。