Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1994-05-25
1995-08-29
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4114
Patent
active
054451361
ABSTRACT:
For stable air-fuel ratio control without hunting, an output condition of an air-fuel ratio sensor is monitored to decide whether or not a modern or advanced control using a dynamic model may be performed. The appropriateness of using the dynamic model may be determined by monitoring whether the output value of an air-fuel ratio sensor exists in a predetermined range or whether the air-fuel ratio sensor is maintained stably in an air-fuel ratio detectable state. When the sensor output condition is out of the predetermined range suitable for the modern control, an optimum feedback gain for performing the modern control is switched over to a lowered gain or the modern control is switched over into normal feedback control by proportional-and-integral control. By this control mode switch-over, most appropriate air-fuel ratio feedback control may be performed.
REFERENCES:
patent: 4203394 (1980-05-01), Aono et al.
patent: 5103791 (1992-04-01), Tomisawa
patent: 5178121 (1993-01-01), Kitajima et al.
patent: 5184588 (1993-02-01), Kato et al.
patent: 5243952 (1993-09-01), Ikuta et al.
patent: 5253630 (1993-10-01), Akazaki et al.
Suzumura Toshihiro
Yamashita Yukihiro
Nelli Raymond A.
Nippondenso Co. Ltd.
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