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。

公开(公告)号：WO1998038415A1

公开(公告)日：1998-09-03

申请号：PCT/US1997022634

申请日：1997-12-04

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  BUSH, Kevin, J. ,  CHURCH, Bruce, A. ,  FRANKOWSKI, David

IPC: F01N03/00

CPC classification number: F01N11/00 ,  F01N11/007 ,  F01N2550/02 ,  F01N2900/0422 ,  Y02T10/47

Abstract: A method for monitoring the performance of a catalytic converter (34) computes the oxygen storage capacity and desorption capacity of a catalyst within the catalytic converter (34). An engine control unit (10) receives mass flow rate information of air from a mass air flow rate sensor (12) and an injector driver (24), and receives electrical signals from an upstream exhaust gas sensor (28) and a downstream exhaust gas sensor (30). The engine control unit (10) calculates normalized air fuel ratios for the exhaust gas entering and leaving the catalytic converter (34) and performs numerical integration to determine the oxygen storage capacity and oxygen desorption capacity of the catalyst in the catalytic converter (34). The calculated oxygen storage and desorption capacities of the catalyst are compared with threshold values to determine the performance of the catalytic converter (34).

Abstract translation: 用于监测催化转化器（34）的性能的方法计算催化转化器（34）内的催化剂的储氧能力和解吸能力。 发动机控制单元（10）从质量空气流量传感器（12）和喷射器驱动器（24）接收空气的质量流量信息，并且从上游废气传感器（28）和下游排气 传感器（30）。 发动机控制单元（10）计算进入和离开催化转化器（34）的废气的归一化空燃比，并执行数值积分，以确定催化转化器（34）中的催化剂的储氧能力和氧解吸能力。 将催化剂的计算氧气存储和解吸能力与阈值进行比较以确定催化转化器（34）的性能。