Engine control with exhaust gas recirculation

Details Engine control with exhaust gas recirculation Engine control with exhaust gas recirculation

1985-04-30

1987-02-03

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123489, 36443106, F02M 2506

Patent

active

046402578

ABSTRACT:
In engine control apparatus with exhaust gas recirculation control and air/fuel ratio feedback control, the amount of recirculated exhausted gasses is accurately detected so as to operate an internal combustion engine under an optimal operating condition all the time. To this end a correction factor derived from oxygen sensor output, which is used for air/fuel ratio control, is monitored to obtain a difference of a correction factor value resulted from engine operation with EGR and another correction factor value resulted from engine operation with EGR. This difference is obtained by forcibly interrupting EGR operation. Once the amount of recirculated exhaust is accurately estimated, the EGR control and/or air/fuel ratio control are performed with compensation for possible error due to secular change in EGR system.

REFERENCES:
patent: 4304210 (1981-12-01), Hayakawa
patent: 4399791 (1983-08-01), Kobayashi et al.
patent: 4448178 (1984-05-01), Yamato et al.
patent: 4471745 (1984-09-01), Yoshioka et al.
patent: 4534334 (1985-08-01), Murakami et al.
patent: 4553518 (1985-11-01), Takao et al.

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