Vehicle controller for controlling air-fuel ratio

An air-fuel ratio and controller technology, applied in electrical control, adaptive control, engine control, etc., can solve the problems of reduced accuracy of identification mode parameters and reduced catalyst purification rate

Inactive Publication Date: 2004-03-10
HONDA MOTOR CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

The reduction in the accuracy of the identification model parameters will also reduce the purification rate of the catalyst

Method used

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  • Vehicle controller for controlling air-fuel ratio
  • Vehicle controller for controlling air-fuel ratio
  • Vehicle controller for controlling air-fuel ratio

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Experimental program
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Embodiment Construction

[0044] Structure of internal combustion engine and control unit

[0045] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. figure 1 is a block diagram showing a controller of an internal combustion engine (hereinafter referred to as an engine) according to an embodiment of the present invention.

[0046] Electric control unit (hereinafter referred to as ECU) 5 comprises: input interface 5a, in order to receive the data that each part of engine 1 sends; CPU5b, in order to realize the operation of each part of control engine 1; ROM) and random access memory (RAM); and an output interface 5d for sending control signals to various parts of the engine 1. Various programs and data for controlling various parts of the vehicle are stored in the ROM. The program for controlling the air-fuel ratio of the present invention, the data and tables used for the program operation are all stored in the ROM. The ROM...

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Abstract

A vehicle controller for controlling the air-fuel ratio of an engine is provided. In one embodiment, the controller comprises a first exhaust gas sensor provided downstream of the catalyst for detecting oxygen concentration of exhaust gas, a first decimation filter connected to the first exhaust gas sensor, and a control unit connected to the first decimation filter. The control unit determines a manipulated variable for manipulating the air-fuel ratio. The first decimation filter oversamples, low-pass filters and then downsamples the output of the first exhaust gas sensor. The first decimation filter can remove chemical noise from the output of the exhaust gas sensor. In another embodiment, a second decimation filter is connected to a second exhaust gas sensor provided upstream of the catalyst for detecting the air-fuel ratio of the exhaust gas. The second decimation filter overasmples, low-pass filters and then downsamples the output of the second exhaust gas sensor. The second decimation filter can compensate the shortage of resolution of the air-fuel ratio sensor.

Description

technical field [0001] The present invention relates to a controller for controlling an air-fuel ratio based on the output of an exhaust sensor disposed in an exhaust system of an internal combustion engine. Background technique [0002] A catalytic converter is located in the exhaust system of a vehicle's internal combustion engine. At a lean air-fuel ratio (lean) of the air-fuel mixture introduced into the engine, the catalytic converter oxidizes HC and CO with excess oxygen contained in the exhaust gas. At rich air-fuel ratio (rich), the catalytic converter reduces NOx with HC and CO. When the air-fuel ratio is within the range of stoichiometric air-fuel ratio, HC, CO and NOx are effectively purified at the same time. [0003] An exhaust gas sensor is provided on the downstream side of the catalytic converter. The exhaust sensor detects the concentration of oxygen contained in the gas discharged into the exhaust system. Feedback control of the engine air-fuel ratio is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D45/00F01N3/24F02D41/02F02D41/14G05B13/02G05B21/02
CPCG05B13/0255F02D2041/1431F02D41/1456F02D41/0235G05B21/02F02D2041/1432F02D2041/142F02D41/1454F02D41/1403F02D41/1402F02D2041/1423F02D41/1441
Inventor 安井裕司岩城喜久新庄章广
Owner HONDA MOTOR CO LTD
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