Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1996-06-28
1998-02-03
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9014, 123568, 123571, 251 31, 251285, F01L 902, F02M 2507
Patent
active
057133158
ABSTRACT:
A multiple step valve opening control system, particularly for an EGR control valve unit, having a plurality of valve lifts. The system comprises a valve member for opening a fluid passage in multiple steps, a first piston slidably housed in a housing, a second cylinder substantially coaxial with the first piston, a second piston fitted in the second cylinder and coupled to the valve member, and a first piston stroke regulating member which is moved selectively to a first position for regulating an allowable displacement of the first piston to a first predetermined extent (l.sub.1) or to a second position for regulating the allowable displacement of the first piston to the first predetermined first extent (l.sub.1) plus a third predetermined extent (l.sub.3). By changing the position of the first piston displacement regulating member, the valve member is opened by various valve lifts.
REFERENCES:
patent: 4817375 (1989-04-01), Brocard et al.
patent: 4915015 (1990-04-01), Richeson et al.
patent: 4930464 (1990-06-01), Letsche
patent: 4961413 (1990-10-01), Grey et al.
patent: 5193495 (1993-03-01), Wood, III
patent: 5603305 (1997-02-01), Miyake et al.
Patent Abstracts of Japan, vol. 17, No. 31 (M-1356), JP4252851, Sep. 1992.
Daigo Yasunori
Jyoutaki Hiroshi
Kohketsu Susumu
Mori Kazutoshi
Yamaki Yoshihisa
Lo Weilun
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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