Title:
【発明の名称】内燃機関の排ガス還流制御装置
Document Type and Number:
Japanese Patent JP3329711
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To execute with high accuracy exhaust gas reflux control by certainly grasping an oxygen concentration in exhaust gas flowed back to an intake system. SOLUTION: A diesel engine 20 is equipped with an EGR device for flowing back a part of exhaust gas to an intake pipe 22 through an EGR passage 35. An ECU 10 detects an EGR gas amount flowed back per each intake stroke, and also detects an oxygen concentration in exhaust gas per each exhaust stroke. An oxygen concentration memory 10a for EGR gas, arranged in the ECU 10, has a plurality of memory regions, and the history of the detected oxygen concentration in exhaust gas is memorized at any time in the memory 10a. The ECU 10 calculates the oxygen concentration in the exhaust gas (oxygen concentration in EGR gas) flowed back to an intake pipe 22 from a memory value memorized before only the reflux delay time of exhaust gas according to the length of the EGR passage 35 that the EGR gas amount occupies, and controls an exhaust gas reflux amount by using the calculated oxygen concentration in EGR gas.
Inventors:
Tatsushi Nakashima
Takao Fukuma
Takao Fukuma
Application Number:
JP32451797A
Publication Date:
September 30, 2002
Filing Date:
November 26, 1997
Export Citation:
Assignee:
Japan Auto Parts Research Institute, Inc.
TOYOTA JIDOSHA KABUSHIKI KAISHA
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D21/08; F02D35/00; F02D41/02; F02D45/00; F02M25/07; (IPC1-7): F02M25/07; F02D21/08; F02D35/00; F02D41/02; F02D45/00
Domestic Patent References:
| JP518324A | ||||
| JP2275055A | ||||
| JP63140856A | ||||
| JP59120770A |
Attorney, Agent or Firm:
Hironobu Onda