Pump-drive device of power-assisted steering system
US4518055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1983 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Mar 11, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/065
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pump-drive device of a power-assisted vehicle steering system, comprising a motor operative to drive a steering pressure pump, a first sensor for detecting vehicle speed and producing an output signal representative of the detected vehicle speed, a second sensor for detecting the motor output speed and producing an output signal representative of the detected motor output speed, a current control circuit responsive to the output signals from the first and second sensors, a main current supply line connected between a power source and the motor through the current control circuit, a bypass current supply line bypassing the current control circuit between the power source and the motor, the current control circuit being operative to produce an output signal to vary the current to be passed through the main current supply line on the basis of the output signals from the first and second sensors, a detecting unit responsive to a predetermined operative condition of the steering system and operative to produce an output signal when the steering system is in the predetermined operative condition, and a line shifting switch unit to provide electrical connection selectively between the p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.