Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-01-08
1991-10-22
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
F02D 4114
Patent
active
050585568
ABSTRACT:
A device for determining an activated condition of the oxygen sensor of a lean sensor for an electric-controlled fuel injection internal combustion engine. When the engine is under a fuel cut operation, the output level from the oxygen sensor is compared with a first predetermined threshold level or with a second predetermined threshold level which is lower than the first threshold level. A determination of the activated condition of the oxygen sensor is obtained when the output level from the oxygen once exceeds the higher first level, or when the output level from the oxygen sensor consecutively exceeds the higher first level twice, whereby a positive and quick determination of the activated condition of the oxygen sensor can be obtained.
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Fukuma Takao
Takaoka Toshio
Tsukamoto Keisuke
Yamasaki Hirofumi
Toyota Jidosha & Kabushiki Kaisha
Wolfe Willis R.
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