Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2006-08-01
2006-08-01
Huynh, Hai (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S399000
Reexamination Certificate
active
07082936
ABSTRACT:
An engine control device is configured to prevent a rotational speed of a vehicle engine from becoming abnormally low during deceleration due to an abnormal air-fuel ratio. When conditions for feedback control of engine idle speed are not satisfied and self diagnosis results of the air-fuel ratio control system are normal, the control device determines if the air-fuel ratio is in an abnormally lean state. The control device then determines if the abnormally lean air-fuel ratio state has continued without interruption for a prescribed period or longer. If so, the control device calculates an air-fuel ratio abnormality compensation quantity, e.g., adds an air-fuel ratio abnormality compensation value to an idle compensation air quantity, to increase the intake air quantity and compensate for the engine torque deficiency resulting from the lean air-fuel ratio state.
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Nakahara Yoichiro
Sakaguchi Shigeyuki
Huynh Hai
Shinjyu Global IP Counselors
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