Using differential pressure control system for VCT lock
US6668778B1 · kind B1 · utility
15Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2003 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Mar 19, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34453
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable cam timing system comprising a VCT locking pin in hydraulic communication with the control circuit of the differential pressure control system (DPCS) is provided. When the control pressure is less than 50% duty cycle the same control signal commands the locking pin to engage and the VCT to move toward the mechanical stop. When the control pressure is greater than 50% duty cycle the locking pin disengages and the VCT moves away from the mechanical stop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.