Title:
AIR-FUEL RATIO CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/181292
Kind Code:
A1
Abstract:
Provided is an air-fuel ratio control device that can perform air-fuel ratio feedback control with a resistive oxygen sensor having high robustness. This air-fuel ratio control device comprises: a PD/PID control unit (49) and a PI control unit (50) that perform feedback control of an excess air rate; a control unit selection unit (51) that selects one of the controls units; a characteristic inspection unit that inspects whether a detection value of a titania oxygen sensor and a temperature of a detection unit correspond to respective prescribed characteristics; and a calibration unit that, on the basis of the inspection, calibrates first and second scale values (G1, G2) of a data map for finding the excess air rate from the detection value and the temperature. The control unit selection unit (51) performs the alternative selection of the PD/PID control unit or the PI control unit in accordance with the inspection result.
Inventors:
WACHI KATSUAKI (JP)
Application Number:
PCT/JP2022/014124
Publication Date:
September 28, 2023
Filing Date:
March 24, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F02D41/14; F02D45/00
Foreign References:
| JPH07127502A | 1995-05-16 | |||
| JPH08338289A | 1996-12-24 | |||
| JP2013142683A | 2013-07-22 | |||
| US5826426A | 1998-10-27 | |||
| JPH09291843A | 1997-11-11 |
Attorney, Agent or Firm:
DELOITTE TOHMATSU IP FIRM (JP)
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