Malfunction detection apparatus for valve timing control device

Details Malfunction detection apparatus for valve timing control device Malfunction detection apparatus for valve timing control device

1996-08-21

1998-04-14

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 134, F02D 1302

Patent

active

057380538

ABSTRACT:
A valve timing control device includes a hydraulic variable valve timing mechanism (VVT). The VVT alters valve timing of the intake valve and/or the exhaust valve. An electronic control unit (ECU) controls the VVT for obtaining overlap suitable for the running condition of the engine, that is, the VVT allows the actual phase angle of the valve timing to approach the target phase angle suitable for the running condition of the engine. A malfunction detection apparatus including the ECU detects a malfunction of the valve timing control device. The ECU judges whether the engine is stalled. The ECU determines whether the actual phase angle of the valve timing corresponds to a specific state, which suggests a malfunction of the valve timing control device. When detecting the stalling of the engine, the ECU detects whether it has judged that the actual phase angle of the valve timing corresponds to the specific state. The ECU then determines that there is a malfunction of the valve timing control device when the actual phase angle of the valve timing corresponds to the specific state.

REFERENCES:
patent: 4996954 (1991-03-01), Seki et al.
patent: 5469818 (1995-11-01), Yoshioka et al.
patent: 5494008 (1996-02-01), Ohkawa et al.
patent: 5529034 (1996-06-01), Sone et al.

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