发明授权
- 专利标题: Electro-hydraulic valve control system for internal combustion engine valves
- 专利标题(中): 内燃机阀门电液阀控制系统
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申请号: US416346申请日: 1982-09-09
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公开(公告)号: US4466390A公开(公告)日: 1984-08-21
- 发明人: Rudolf Babitzka , Wilhelm Polach , Walter Schlagmuller
- 申请人: Rudolf Babitzka , Wilhelm Polach , Walter Schlagmuller
- 申请人地址: DEX Stuttgart
- 专利权人: Robert Bosch GmbH
- 当前专利权人: Robert Bosch GmbH
- 当前专利权人地址: DEX Stuttgart
- 优先权: DEX3135650 19810909
- 主分类号: F01L9/02
- IPC分类号: F01L9/02 ; F01L13/00 ; F01L1/34
摘要:
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).