Fuel control device and method for internal combustion engine

Details Fuel control device and method for internal combustion engine Fuel control device and method for internal combustion engine

1992-07-31

1993-06-01

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123480, 123486, F02D 4118

Patent

active

052150623

ABSTRACT:
In a fuel control device for an internal combustion engine wherein an estimated pressure (Pi) in the engine intake manifold is calculated by digital filtering an output signal from a H/W sensor by making use of a difference equation, an air flow rate (Qc) at the engine cylinder port is estimated based upon a detected engine rotating number (N) and the calculated estimated pressure (Pi) by retrieving a value of air flow rate from a map defined by the engine rotating number (N) and the estimated pressure (Pi) in the engine intake manifold. Then, the fuel quantity (Tp) to be injected is calculated based upon a detected engine rotating number (N) and the estimated air flow rate (Qc) at the engine cylinder port. However during the engine starting period, a learned estimated pressure in the engine intake manifold is used instead of the calculated estimate pressure (Pi) in the engine intake manifold to determined the retrieved estimated air flow rate (Qc). The learned estimated pressure in the engine intake manifold for the engine starting period is obtained by taking in a value of calculated estimated pressure (Pi) in the engine intake manifold immediately after the engine reaches a complete explosion condition, whereby the interval from the engine start to the engine start completion is shortened, the starting characteristic of the motor vehicle is improved and degradation of exhaust gas is suppressed.

REFERENCES:
patent: 4785785 (1988-11-01), Oba et al.

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