发明名称 |
Method and system for variable cam timing device |
摘要 |
Methods and systems are described for an engine with a cam torque actuated variable cam timing phaser. Phaser positioning control is improved by reducing inaccuracies resulting from inadvertent spool valve and/or phaser movement when the spool valve is commanded between regions. In addition, improved spool valve mapping is used to render phaser commands more consistent and robust. |
申请公布号 |
US9410453(B2) |
申请公布日期 |
2016.08.09 |
申请号 |
US201414520194 |
申请日期 |
2014.10.21 |
申请人 |
Ford Global Technologies, LLC |
发明人 |
Rollinger John Eric;Pietrzyk Paul A.;Badillo Ed;Hanshaw Jamie Charles |
分类号 |
F01L1/34;F01L1/344 |
主分类号 |
F01L1/34 |
代理机构 |
Alleman Hall McCoy Russell & Tuttle LLP |
代理人 |
Voutyras Julia;Alleman Hall McCoy Russell & Tuttle LLP |
主权项 |
1. A method, comprising:
during selected conditions, ramping a spool valve coupled to a cam torque actuated variable cam timing phaser from a detent region to a retard region; and mapping a transitional region between the detent and retard regions based on phaser movement away from a locked position, the phaser movement responsive to the ramping. |
地址 |
Dearborn MI US |