Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-03-19
1998-03-31
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5100
Patent
active
057326819
ABSTRACT:
The internal combustion engine fuel property detecting apparatus of the present invention can realize the fuel property detection which is free from the influence of the wall surface fuel deposit amount before the transient time and to prevent the erroneous determination. If fuel cut-off is carried out on fulfillment of the fuel cut-off conditions (S220), it is judged whether or not transition to the acceleration state has occurred within the prescribed time t0 after completion of the fuel cut-off (S260). On determination of transition to the acceleration state, the transition amount .increment.AF in the detected values of the air-fuel ratio sensor 85 (S270-S300) and the fuel supplied is determined as whether or not a heavy fuel (S310-S320). When the fuel supply is cut off, the fuel having adhered to the wall surface of the intake manifold and the cylinder is ingested into the combustion chamber with the negative pressure of the internal combustion engine and the wall surface deposit amount is evenly reduced; the fuel property determination is made after acceleration starts in the state wherein the wall surface deposit amount is evenly reduced and thus erroneous determination is effectively prevented.
REFERENCES:
patent: 5564393 (1996-10-01), Asano et al.
patent: 5597371 (1997-01-01), Toukura
patent: 5609139 (1997-03-01), Ueda et al.
patent: 5629853 (1997-05-01), Ogawa et al.
patent: 5647324 (1997-07-01), Nakajima
Nelli Raymond A.
Toyota Jidosha & Kabushiki Kaisha
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