Hydraulic apparatus for adjusting the timing of opening and clos

Details Hydraulic apparatus for adjusting the timing of opening and clos Hydraulic apparatus for adjusting the timing of opening and clos

1998-11-12

2000-02-15

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

060240628

ABSTRACT:
A hydraulic apparatus for adjusting the timing of opening and closing of an engine valve of a prior art has the drawback that sludge from the oil pressure chamber tends to accumulate on the inner surface of the housing of the actuator, which controls the rotor in a valve timing adjusting system for controlling the valve timing of the engine. This causes troubles in the operation of the rotor. In the present invention, while the fuel delivery to the engine M1 is being cut off, the hydraulic media providing means M10 is controlled by the timing advance control means M13 to rotate further the rotor from the position at the moment that the fuel delivery is cut off, so as to clean the inner side of the housing of the actuator M9, the control of the setting and the execution of the cleaning mode is carried out by a cleaning condition judging means M14. A mode exchange means M15 controls the hydraulic media providing means M10 to exchange its normal mode and the cleaning mode, according to the state of the engine.

REFERENCES:
patent: 5146886 (1992-09-01), Mannle et al.
patent: 5611304 (1997-03-01), Shinojima
patent: 5738056 (1998-04-01), Mikame et al.
patent: 5836276 (1998-11-01), Iwasaki et al.
patent: 5875750 (1999-03-01), Iwasaki et al.

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