发明授权
- 专利标题： Variable valve timing control apparatus for internal combustion engine
- 专利标题（中）： 内燃机可变气门正时控制装置
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申请号： US12839602申请日： 2010-07-20
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公开(公告)号： US08261704B2公开(公告)日： 2012-09-11
- 发明人: Yuichi Takemura
- 申请人： Yuichi Takemura
- 申请人地址： JP Kariya
- 专利权人： Denso Corporation
- 当前专利权人： Denso Corporation
- 当前专利权人地址： JP Kariya
- 代理机构： Nixon & Vanderhye PC
- 优先权： JP2009-178291 20090730
- 主分类号： F01L1/34
- IPC分类号： F01L1/34
摘要：
A variable valve timing control apparatus is provided for an internal combustion engine that has a crankshaft, a camshaft, a hydraulic variable valve timing unit, a lock pin, and a hydraulic control valve. The hydraulic control valve is configured to control oil pressure that actuates the variable valve timing unit and the lock pin. The control apparatus switches a control, based on an operational state, between (a) a variable cam timing (VCT) phase control for controlling the VCT phase to a target phase and (b) a lock pin projection control for allowing the lock pin to project. The control apparatus executes, when an abnormality occurs, a foreign object release control for changing a control amount of the hydraulic control valve based on a predetermined pattern, wherein the control apparatus changes the predetermined pattern depending on the abnormality in the execution of the foreign object release control.
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