Brake fluid pressure retaining device
US7125087B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 2004 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Jul 20, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2201/06
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A brake fluid pressure retaining unit is provided which allows a relief pressure to be variable only by use of a low-cost electromagnetic valve without using an expensive relief valve and orifice. The brake fluid pressure retaining unit includes an electromagnetic valve which is provided midway in a brake fluid channel connecting a master cylinder and a wheel cylinder and is capable of freely opening/closing the brake fluid channel by passing current though a solenoid coil; and an electromagnetic valve control section which detects a release signal indicative of releasing brake operation detected by a brake operation detecting section and passes current through the solenoid coil while referring to current values corresponding to a target maintaining fluid pressure to maintain a predetermined braking force. The electromagnetic valve control section determines in advance a predetermined opening-side current value required to switch the electromagnetic valve from a closed state to an open state and a predetermined closing-side current value required to switch the electromagnetic valve from an open state to a closed state, for each target maintaining fluid pressure, and performs contro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.