Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1990-06-12
1991-10-29
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9015, 123489, F01L 134
Patent
active
050606042
ABSTRACT:
Failure of a valve timing changeover control system of an internal combustion engine is detected by comparing a present value of an air-fuel ratio feedback control correction coefficient which is varied in response to output from an O.sub.2 sensor with a predetermined value of the correction coefficient obtained based on values of same obtained during the feedback control of the air-fuel ratio. Alternatively, or in combination, failure of the valve timing changeover control system is detected by determining whether a present value of the correction coefficient obtained with respect to each of a plurality of cylinders of the engine in response to output from each of O.sub.2 sensors corresponding to the each cylinder is outside a predetermined range of deviation of values of the correction coefficient from a reference value, the deviation resulting from differences in characteristics between the cylinders.
REFERENCES:
patent: 4917057 (1990-04-01), Seki
patent: 4960083 (1990-10-01), Seki et al.
patent: 4960094 (1990-10-01), Keike et al.
patent: 4960095 (1990-10-01), Koike et al.
patent: 4996954 (1991-03-01), Seki et al.
Seki Yasunari
Tachibana Yosuke
Honda Giken Kogyo Kabushiki Kaisha
Lo Weilun
Wolfe Willis R.
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