Abnormality detecting apparatus for internal combustion engine

Details Abnormality detecting apparatus for internal combustion engine Abnormality detecting apparatus for internal combustion engine

1996-02-22

1997-05-06

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 134

Patent

active

056261080

ABSTRACT:
In detecting the occurrence of an abnormality in a variable valve timing mechanism, which continuously changes a valve timing by advancing or delaying the displacement angle of an intake-side cam shaft with respect to a crankshaft, an abnormality detecting apparatus for a valve timing control apparatus determines that the variable valve timing mechanism is failing when the absolute value of the difference between a target displacement angle and a correct real displacement angle, obtained by subtracting the maximum delay-angle learning value from the real displacement angle, is greater than a first predetermined value and the absolute value of the difference between a correct real displacement angle and a previous correct real displacement angle is equal to or smaller than a second predetermined value.

REFERENCES:
patent: 4996954 (1991-03-01), Seki et al.
patent: 5103780 (1992-04-01), Ishii
patent: 5363817 (1994-11-01), Ikeda et al.
patent: 5529034 (1996-06-01), Sone et al.
Patent Abstracts of Japan, vol. 18, No. 640 (M-1717), Dec. 6, 1994 & JP-A-06 248986 (Toyota Motor Corp.), Sep. 6, 1994.
Patent Abstracts of Japan, vol. 8, No. 224 (M-331), Oct. 13, 1984 & JP-A-59 105911 (Toyota Jidosha KK), Jun. 19, 1984.

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