Electro-hydraulic valve control system for internal combustion e

Details Electro-hydraulic valve control system for internal combustion e Electro-hydraulic valve control system for internal combustion e

1982-09-09

1984-08-21

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9012, F01L 134

Patent

active

044663900

ABSTRACT:
Electric control of a hydraulic valve control system is obtained by providing hydraulic fluid to form a hydraulic plug between a cam follower in engagement with the camshaft of the engine and a valve stem (11), the hydraulic plug or hydraulic fluid being retained in a chamber which, under control of an electrically operated valve (20, 25; 38), can establish communication to a drain line (19, 47). For rapid movement, the valve can be clamped in closed position by a piezoelectric column (FIG. 1: 28) to prevent drainage, and, upon clamping release of the column, permit drainage, and hence release of the "hydraulic plug", and thus provide for closing action of the valve under operation of a valve spring (13) to thereby shorten the open-time of the valve (FIG. 2, compare curves 31, 32, 33). A spool slider valve can also be used, the position of which is controlled by a pilot valve (FIG. 3: 40, 57, 64) in which a piezoelectric element moves a piston (57) which establishes pressure differential on a slider spool (42) which, respectively, connects the hydraulic plug to a drain (47) or prevents drainage, thus transferring movement of a cam (3) from the camshaft to the cam follower (4) and hence to the valve stem (11).

REFERENCES:
patent: 4153016 (1979-05-01), Hausknecht
patent: 4218995 (1980-08-01), Aoyama

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