Active steering nibble control algorithm for electric steering systems
US8219283B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2008 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Mar 10, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0472
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A system and method for actively cancelling steering nibble and/or brake judder in an electric power steering system using a controller and an electric motor by converting a selected wheel speed to a frequency, selecting a nibble order, determine nibble enable frequencies for cancellation, selecting a damping factor based on changes in vehicle velocity, calculating filter coefficients based on the selected damping factor, the selected nibble order and the wheel frequency, applying a gain scheduler to a steering column torque signal for the nibble enable frequencies, applying a tuned resonator filter to an output of the gain scheduler and using the filter coefficients to produce a nibble signal, calculating an active nibble cancelling torque signal from the nibble signal and applying the active nibble cancelling torque signal to the electric motor to cancel steering wheel nibble vibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.