Method for limiting the hydraulic maximum pressure of a power-assisted steering system
US6236178A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Apr 13, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/065
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The object of the present invention is to provide a method for limiting the hydraulic maximum pressure of a power-assisted steering system, which permits effective pressure limitation and thus protects the individual elements of the power-assisted steering system, i.e., a pressure limitation not far above the desired maximum operating pressure, but on the other hand does not require an overdimensioning of the individual segments of the power-assisted steering system. To solve this technical problem, the invention proposes a method for limiting the hydraulic maximum pressure of a power-assisted steering system whose hydraulic pump is driven by an electric motor characterized in that an upper limit value for the hydraulic maximum pressure is predefined, a limit value for the maximum current input is calculated therefrom, the generated current input of the electric motor is measured and, if the upper limit value is exceeded, the hydraulic flow is limited through the current input by reducing the speed of the electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.