Problem diagnosis system in pressure device control apparatus
US5373454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1992 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Jan 14, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pressure device control apparatus including a pressure source having a pump, and an accumulator connected to the pump and a pressure device, and a pressure detector for detecting the pressure in the accumulator; a normally-closed type solenoid valve interposed between the pressure device and the accumulator or a fluid tank; and a control unit having a drive control device for outputting a driving signal indicative of a command to operate the pump in response to a detection pressure detected in the pressure detector becoming equal to or less than a first predetermined pressure and a drive stopping signal indicative of a command for stopping the operation of the pump in response to the detection pressure becoming equal to or more than a second predetermined pressure which is higher than the first predetermined pressure. The control unit includes a first energizing unit for energizing the normally-closed type solenoid valve for a first predetermined time after the drive control device outputs the drive stopping signal, and a deciding unit for deciding that there is a problem in response to the detection pressure detected in the pressure detector becoming equal to or less than the fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.