Automotive brake fluid pressure control apparatus
US5584543A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1995 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Aug 18, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2270/206
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Temperature of brake fluid is estimated, and a pressure-increase gradient change ratio Pup, a pressure-reduction gradient change ratio Pdw, and pump-discharge gradient change quantity Ppmp in correspondence with an amount of decline in pump-discharge capacity at the estimated brake-fluid temperature are calculated respectively. These compensation multipliers Pup, Pdw, and Ppmp are variables for obtaining a pressure-increase gradient change ratio, pressure-reduction gradient change ratio, and pump-discharge gradient change quantity identical to a time of normal temperature (i.e., a time of normal temperature when pump-discharge capacity has not declined). Accordingly, a pressure-increase time Tup and pressure-reduction time Tdw in ABS control and TRC control are calculated utilizing these compensation multipliers to obtain control performance of brake-fluid pressure similar to a time of normal temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.