Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-01-23
1991-11-26
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5100
Patent
active
050674668
ABSTRACT:
A system for measuring a flow rate of intake air introduced into an internal combustion engine for an automotive vehicle, includes a hot-wire type air flow meter which comprises a sensor portion having a ceramic bobbin and a heating member wound onto the ceramic bobbin, and a control circuit for controlling current passing through the heating element so as to a hold temperature of the heating element constant. The hot-wire type air flow meter monitors the flow rate of the intake air to produce a sensor signal representative of the flow rate. The system also includes a control unit which receives the sensor signal to compensate a response time lag of the sensor signal, particularly when the engine operates in a transient state, such as acceleration and deceleration. The control unit derives a variation of the sensor signal value per a predetermined period of time to integrate the variation over a predetermined period of time to attenuate the integrated value, and corrects the sensor signal value on the basis of the attenuated value to use the result as a corrected value for air flow rate.
REFERENCES:
patent: 4887577 (1989-12-01), Arai et al.
patent: 4889101 (1989-12-01), Schifford
Nelli Raymond A.
Nissan Motor Company Limited
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