Electric power steering system
US5667033A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1995 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Dec 8, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/9318
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric power steering system of this invention can inform the driver of potential danger by providing control by way of safety precaution before a vehicle enters a dangerous situation. The occurrence of dangerous situations is determined based on a signal from an obstacle sensor. If a steering wheel is turned in a dangerous situation, a warning control is performed on a motor. The motor outputs a torque for t1 seconds, for example, which counters against turning of the steering wheel. Then, the motor enters a "non-assist" state wherein no current is applied thereto for t2 seconds. If an intermittent counter torque is applied by the motor, it is hard to turn the steering wheel and the steering wheel is caused to vibrate, thereby preventing the vehicle from being steered to collide with an obstacle and, warning the driver of the danger with vibration caused in the steering wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.