Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1988-09-20
1989-09-19
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, F02M 5100
Patent
active
048671258
ABSTRACT:
An apparatus and method for adjusting the air/fuel ratio inducted into an internal combustion engine to achieve a desired air/fuel ratio. A desired fuel charge is first derived from a measurement of inducted airflow and then modulated with a triangular wave. The actual deviation of the mean value of the triangular wave from the desired air/fuel ratio is calculated. More specifically, the ratio of time the modulated signal is offset from the desired air/fuel ratio is trigonometrically related to the actual deviation. This time ratio is derived from a two-state (rich/lean) signal which is provided by comparing an exhaust gas oxygen sensor voltage output to a reference value. In response to the deviation calculation, the desired fuel charge signal is shifted to zero in on the desired air/fuel ratio.
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Abolins Peter
Ford Motor Company
Lippa Allan J.
Nelli Raymond A.
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