Valve timing control apparatus for engine

Details Valve timing control apparatus for engine Valve timing control apparatus for engine

1994-11-04

1996-06-25

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, 123 9031, F01L 134

Patent

active

055290345

ABSTRACT:
A cam shaft of an engine is provided with a timing change mechanism (VVT) which is driven by hydraulic pressure to alter the timing of a intake valve (valve timing). This VVT is controlled to change the valve overlap of the intake valve and an exhaust valve, thereby adjusting the suction and exhaust in and from a combustion chamber. To control the VVT, an electronic control unit (ECU) computes a target value for the valve timing in accordance with the running condition of the engine and controls the supply of the hydraulic pressure to the VVT based on the target value. The ECU determines the level of the actual hydraulic pressure given to the VVT. When the actual valve timing does not lie in a predetermined range with respect to the target value, the ECU determines that an abnormality has occurred in the VVT, and executes a predetermined fail safe routine. When the hydraulic pressure is equal to or smaller than a reference value, the ECU suppresses WT malfunction determinations.

REFERENCES:
patent: 4995351 (1991-02-01), Ohkubo et al.
patent: 5333577 (1994-08-01), Shinojima
patent: 5417187 (1995-05-01), Meyer et al.

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