Fuel multiplier transfer from dynamic crankshaft fueling control

Details Fuel multiplier transfer from dynamic crankshaft fueling control Fuel multiplier transfer from dynamic crankshaft fueling control

1998-12-15

2000-07-11

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123436, F02D 4114

Patent

active

06085734&

ABSTRACT:
A method is provided for controlling the delivery of fuel to an engine of an automotive vehicle equipped with a dynamic crankshaft fuel control system and an oxygen sensor feedback based fuel control system. The method includes determining an averaged combustion metric from the dynamic crankshaft fuel control system. The combustion metric is compared to an allowable engine roughness value and a dynamic crankshaft fuel control fuel multiplier is adjusted based on the comparison via a proportional-integral-derivative control calculation. Thereafter, the integral term of the dynamic crankshaft fuel control system's proportional-integral-derivative control calculation is stored. If it is time to switch fuel control from the dynamic crankshaft fuel control system to the oxygen sensor feedback fuel control system, the stored integral term of the dynamic crankshaft fuel control system's fueling multiplier is transferred to the proportional-integral-derivative calculation of the oxygen sensor feedback fuel control system. As such, the last integral term used in determining the fuel multiplier of the dynamic crankshaft fuel control system is used as the first integral term determining the fuel multiplier of in the oxygen sensor feedback fuel control system. As such, the transition from one fuel control system to the other is smoothed.

REFERENCES:
patent: 4780827 (1988-10-01), Fujimori et al.
patent: 5056308 (1991-10-01), Kume et al.
patent: 5809969 (1998-09-01), Fiaschetti et al.
patent: 5901684 (1999-05-01), Fiaschetti et al.
patent: 5947088 (1999-09-01), DeGroot et al.

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