Braking system for electric vehicle
US5433512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Nov 15, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2270/608
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In an electric vehicle capable of regenerative braking of wheels, a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by operation of a brake operating element and a brake cylinder for a driven wheel. In a first region in which an input hydraulic pressure into the differential pressure regulating valve is equal to or less than a predetermined value, an output hydraulic pressure from the differential pressure regulating valve is maintained at zero, and in a second region in which the input hydraulic pressure exceeds the predetermined value, the output hydraulic pressure is lower than the input hydraulic pressure by the predetermined value. Further, in the first region, a regenerative braking force is determined in proportion to a quantity of operation of the brake operating element, and in the second region, the regenerative braking force is maintained at a constant value irrespective of the quantity of operation of the brake operating element. Thus, the regenerative braking force is preferentially generated at the start of braking, and after the regenerative braking force reaches a limit, a deficiency of braki…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.