Common rail system
US6305356A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Jan 7, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7792
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A common rail system having a regulated prefeed pump, which pumps a fuel flow from a fuel tank to a high-pressure pump. The fuel flow is split with the aid of a valve assembly into a lubricant flow and a high-pressure feed flow that is pumped into a high-pressure reservoir, and acted upon by high pressure. The prefeed pump has a substantially linear characteristic feed curve with a certain slope. To improve the regulating performance, the valve assembly for the lubricant flow includes a valve whose characteristic feed curve initially rises in a first portion (I) with the rpm of the prefeed pump with the same slope as the characteristic feed curve of the prefeed pump. Then in a second portion (II) rises substantially linearly, with a lesser slope than the characteristic feed curve of the prefeed pump, and in a third portion (III) finally drops again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.