Title:
AIR-FUEL RATIO CONTROL DEVICE USING DECIMATION FILTER FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3957180
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To compensate a shortage of resolution of an air-fuel ratio sensor by reducing the chemical noise in an output of an exhaust gas sensor.
SOLUTION: This air-fuel ratio control device is provided with the exhaust gas sensor for detecting concentration of the exhaust gas, an air-fuel ratio sensor provided in the upstream of a catalyst device to detect an air-fuel ratio of the exhaust gas, a decimation filter connected to an output side of the exhaust gas sensor, and a decimation filter connected to an output side of the air-fuel ratio sensor. The control device decides the operation rate for operating the air-fuel ratio so that an output of the exhaust gas sensor converges to a target value by using values output from the first and the second decimation filters. The first and the second decimation filter respectively over-sample output of the exhaust gas sensor and the air-fuel ratio sensor, and smooth them with a low-pass filter to do re-sampling with a cycle for computing the operation rate.
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Inventors:
Yuji Yasui
Yoshihisa Iwaki
Akihiro Shinjo
Yoshihisa Iwaki
Akihiro Shinjo
Application Number:
JP2002234045A
Publication Date:
August 15, 2007
Filing Date:
August 09, 2002
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F02D41/14; F02D45/00; F01N3/24; G05B13/02; G05B21/02; F02D41/02; (IPC1-7): F02D41/14; F01N3/24; F02D45/00
Domestic Patent References:
| JP11153051A | ||||
| JP8232713A | ||||
| JP6088520A | ||||
| JP9502847A | ||||
| JP9158764A |
Attorney, Agent or Firm:
Next student Okada
Naoya Fushimi
Yukari Hirano
Naoya Fushimi
Yukari Hirano