Four wheel steering apparatus
US5508921A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/1581
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A four-wheel steering apparatus comprises a front wheel steering angle sensor for detecting the steering angles given to the front wheels, a vehicle speed sensor for detecting vehicle speeds, a rear wheel output shaft for giving steering angles to the rear wheels by being displaced it in the axial direction, a centering spring having the resiliency enabling the rear wheel output shaft to be returned to the neutral position, an electric motor for causing the rear wheel output shaft to be displaced in the axial direction against the resiliency of the centering spring, and a controller for controlling the energizing of the electric motor on the basis of the signals from the front wheel steering sensor and vehicle speed sensor, the controller adjusting the output torque of the electric motor on the basis of the signals from the front wheel steering sensor and vehicle speed sensor to control the rear wheel output shaft to be displaced for a desired amount by open loop control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.