Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1989-08-01
1990-10-02
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
F01L 134
Patent
active
049600834
ABSTRACT:
A failsafe method in connection with valve timing-changeover control for an internal combustion engine. An abnormality in a control system of the engine is detected. A changeover-instructing signal is generated for changing the valve timing to the low speed valve timing in both of the lower and higher engine speed regions, when the abnormality is detected. When the abnormality is detected, the air-fuel ratio of an air-fuel mixture to be supplied to the engine is enriched when the engine is in a predetermined operating condition determined by the detected value of at least one engine parameter. The enriching of the air-fuel ratio of the air-fuel mixture is carried out by multiplying a basic fuel injection period by a correction coefficient or selecting a suitable basic fuel injection period map.
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patent: 4819602 (1989-04-01), Mieno et al.
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Seki Yasunari
Yahata Isao
Honda Giken Kogyo Kabushiki Kaisha
Lo Weilun
Myhre Charles J.
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