Four wheel steering system with speed-dependent phase reversal
US5224042A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Feb 19, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D7/159
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A four wheel steer control system which uses vehicle speed, front wheel position, and the rate of change of the front wheel position to develop the rear wheel steering command. The rear steering command is a combination of the steady state and transient rear wheel commands which are developed individually. The rear wheel steady state command is a function of vehicle speed and front wheel position. The rear wheel transient command is a function of the rate of change of the front wheel position and vehicle speed. Determining the rate of change of front wheel position is done by taking samples of the front wheel position over time and calculating the difference in position between consecutive samples. As the vehicle speed changes the number of differences which are used to calculate the rate of change varies, allowing for the constant tuning of the response time of the rear wheels, resulting in a vehicle which is optimized for response and stability over the entire range of vehicle speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.