Braking system having vacuum booster whose boosting ratio is lowered at fixed transition point at which wheel cylinder pressure increase is initiated
US6739676B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 19, 1999 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Jul 23, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/686
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Vehicle braking system including a vacuum booster for transmitting a boosted brake operating force to a master cylinder such that the boosting ratio is reduced at a fixed transition point before the boosting limit point is reached, a brake having a wheel brake cylinder connected through a fluid passage to a master cylinder serving as a first hydraulic pressure source, for braking a wheel, and a pressure increasing device having a second hydraulic pressure source connected to the fluid passage, and wherein the pressure increasing device initiating a pressure increasing operation, when the brake operating force has increased to the transition point, to increase the wheel cylinder pressure to be higher than the master cylinder pressure, by using the second hydraulic pressure source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.