Apparatus and method of compensating an oscillation in a steering system without a mechanical connection between the control unit and the steered wheels
AssigneeRobert Bosch GmbH
InventorsJoerg Strecker, Martin Pfeil
Life of this patent
Estimating the term…
Abstract
A method is for compensating an oscillation in a steering system of a vehicle without a mechanical connection between a control unit of the steering system and the steered wheels. A speed of the vehicle is determined. As a function of the speed, an estimated frequency and an estimated bandwidth of the oscillation are determined. A signal characterizing an estimated or measured force or an estimated or measured torque on a toothed rod or tie rod of the steering system is estimated. The oscillation in the signal is compensated as a function of the estimated frequency and the estimated bandwidth.
Claims9
A method of compensating an oscillation in a steering system of a vehicle without a mechanical connection between a control unit of the steering system and steered wheels of the vehicle, comprising:
- determining a speed of the vehicle;
- determining, as a function of the speed, an estimated frequency and an estimated bandwidth of the oscillation;
- estimating a signal characterizing an estimated or measured force or an estimated or measured torque on a toothed rod or tie rod of the steering system;
- compensating the oscillation in the signal as a function of the estimated frequency and the estimated bandwidth;
- filtering the signal with a filter;
- and
- determining a cutoff frequency of the filter as a function of the estimated frequency of the oscillation, and determining a bandwidth of the filter as a function of the estimated bandwidth of the oscillation.
A method of compensating an oscillation in a steering system of a vehicle without a mechanical connection between a control unit of the steering system and steered wheels of the vehicle, comprising:
- determining a speed of the vehicle;
- determining, as a function of the speed, an estimated frequency and an estimated bandwidth of the oscillation;
- estimating a signal characterizing an estimated or measured force or an estimated or measured torque on a toothed rod or tie rod of the steering system;
- compensating the oscillation in the signal as a function of the estimated frequency and the estimated bandwidth;
- measuring or estimating a frequency of the oscillation of the signal;
- and
- adding a compensation signal to the signal when the frequency of the oscillation is within a frequency range defined by the estimated bandwidth and the estimated frequency.
Dependencies are inferred from the claim text.